EP0238455A2 - Ein- oder Mehrfach-Vibrationssieb - Google Patents

Ein- oder Mehrfach-Vibrationssieb Download PDF

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Publication number
EP0238455A2
EP0238455A2 EP87830099A EP87830099A EP0238455A2 EP 0238455 A2 EP0238455 A2 EP 0238455A2 EP 87830099 A EP87830099 A EP 87830099A EP 87830099 A EP87830099 A EP 87830099A EP 0238455 A2 EP0238455 A2 EP 0238455A2
Authority
EP
European Patent Office
Prior art keywords
mesh
cross beam
screen
meshes
moving
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Withdrawn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
EP87830099A
Other languages
English (en)
French (fr)
Other versions
EP0238455A3 (en
Inventor
Ireneo Dario De Poli
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.)
Flli De Poli Srl
Original Assignee
Flli De Poli Srl
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 Flli De Poli Srl filed Critical Flli De Poli Srl
Publication of EP0238455A2 publication Critical patent/EP0238455A2/de
Publication of EP0238455A3 publication Critical patent/EP0238455A3/en
Withdrawn legal-status Critical Current

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    • 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
    • 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
    • B07B2201/00—Details applicable to machines for screening using sieves or gratings
    • B07B2201/04—Multiple deck screening devices comprising one or more superimposed screens

Definitions

  • This invention relates to an improved simple or multiple type vibrating screen.
  • Simple or multiple type vibrating screens are known, and they comprise in general a single screening mesh in the case of a simple screen or a plurality of screening meshes in the case of a multiple screen. Said mesh or meshes are supported by a frame connected to means adapted to subject it to an oscillating motion. In the case-of a multiple screen, the meshes are stacked one above the other, whereby it has been possible to reduce the overall dimensions of this equipment.
  • the meshes may comprise metal mesh or perforated metal sheet, and they are fastened to the support frame at their side edges, i.e. at the longitudinal edges thereof parallel to the forward moving direction of the materials to be handled.
  • clamping of said edges is performed by means of rectilinear metal sections which are in turn fastened to the frame by means of a plurality of clamping screws.
  • the above screening mesh arrangement involves non negligible drawbacks, which have a strong bearing both on the screening process per se, and on the amount of maintenance regularly required by the screen, concerning in particular the replacement of one or more meshes.
  • the meshes of conventional screens in a direction perpendicular to the advancing direction of the materials to be processed have a cross sectional configuration which rather than being rectilinear arches upwards taking a maximum deflection relative to a horizontal line in the intermediate portion.
  • This configuration is acquired by the meshes of the known type screens just because the screen side edges are clamped, and the distance therebetween cannot be varied, whereby, when the mesh is fastened to the support frame
  • One of the main objects of this invention is to provide an improved vibrating screen, in particular an overlaying mesh type screen, whereby an optimum screening efficiency is obtained in that said operation is performed uniformly over the whole surface of the meshes.
  • Another object of this invention is to provide a screen of the type mentioned above wherein all the various meshes can be fastened to the support structure in such a way that, when the screen starts operating, said meshes are securely clamped to the support frame, whereby the stresses endured by said multiple meshes during equipment operation are reduced to a minimum.
  • a further object of -this invention is to provide a screen of the type mentioned above, wherein the mesh replacement and maintenance operations can be performed without requiring disassembly of additional overlaying meshes, whereby said meshes do not get damaged.
  • Another important feature of the subject screen resides in that every single mesh, once it has been put into operation, is no longer disassembled, until it has completely worn out.
  • a further noteworthy feature of the screen of this invention is the possibility to controllably tension every single mesh along one end thereof, and the fact that the same, owing to suitable support means thereof, arranges itself according to a longitudinally upward convex configuration, while remaining perfectly flat in a transverse direction.
  • the screen according to this invention includes, according to a known construction, a screening mesh support frame comprising a stationary structure 1 and a moving frame 2, connected together in a conventional way by means of intervening resilient means 3, in this particular case comprising helical springs.
  • Moving frame 2 is the part of the screen frame where the screening meshes will be fastened by means of a particularly simple hooking system, and said frame will be subjected to an oscillating vibratory motion whereby said meshes can perform their screening process.
  • a device adapted to subject the moving frame 2 to said vibrations Said device, shown at 4, in the subject embodiment comprises a crankshaft motor which could also be made in the form of any other device suitable to subject moving frame 2 to an oscillating motion.
  • a crankshaft motor which could also be made in the form of any other device suitable to subject moving frame 2 to an oscillating motion.
  • moving frame 2 comprises substantially two side walls 2a, 2b, connected to the stationary structure 1 as described above.
  • a longitudinal side member 3a, 3b On the outer side of each of the side walls 2a, 2b there is fastened a longitudinal side member 3a, 3b respectively, having a double-T shaped cross section.
  • this cross sectional shape should not be considered binding in that the main function of said two longitudinal side members is to support , at the ends thereof, a moving cross beam and a stationary cross beam where the screening mesh will be hooked, said cross beams being further described in the followig.
  • the longitudinal side members 3a, 3b could be more simply replaced-by support brackets for said cross beams, but the cross sectional double-T shape was chosen, in the exemplary embodiment considered herein, in order to strengthen the screen structure which is severy stressed dynamically, and also because the lower horizontal side of this double T can be used as a bearing support area if the screen has to be moved whereby clamping of the same to suitable transportation means becomes necessary.
  • the screen according to this invention is a multiple screen and in particular it comprises two screening planes, therefore it is provided with two meshes, shown at 5 (the upper one) and at 6 (the lower one) respectively.
  • the term "mesh" is used to designate the member performing the material screening function and said definition should be taken as inclusive of the two main types of screening means in- use, i.e. the metal mesh and the perforated metal sheet.
  • the screen according to this invention may be built-using either of said means, and alternatively other types of materials available on the market, as well.
  • mesh 5 is fastened to a moving cross beam, as it will be explained hereinafter while, at the outlet end thereof, mesh 5 is fastened to a stationary cross beam. As it is understood, fastening of mesh 5 might also be performed in an opposite fashion.
  • the description of the clamping to the stationary cross beam will now be started, this being simpler also from an operation point of view.
  • a stationary cross beam 7 having a double T shaped cross sectional shape as it appears in particular from Figure 3, and from the enlarged detail thereof.
  • the horizontal lower side of stationary beam 7 is fastened, at the cross beam ends, onto the ends of longitudinal side members 3a, 3b, for instance by means of welding or any other known fashion.
  • the horizontal upper side of stationary cross beam 7 allows for hooking of mesh 5, as it is more clearly shown in the enlarged detail of Figure 3.
  • mesh 5 is provided, at the edge thereof that has to be fastened to the materials outlet end, with a substantially V-shaped section 8, for instance made integral with mesh 5, which hooks up to a portion of the horizontal upper side of stationary cross beam 7, in the instant case the left half of said side.
  • the V-shaped section 8 is easy to procure associated to a mesh, and this further reduces the screen manufacturing cost.
  • Fastening of mesh 5 at the inlet end of the materials to be processed is performed by using a moving cross beam in turn cooperating with. a further stationary cross beam for the clamping and tensioning of mesh 5.
  • mesh 5 is provided, also at the edge thereof located at the inlet end of the materials to be processed, with a substantially V-shaped section 9, similar to V-shaped section 8, which is hooked up to an extended edge 10 of a moving cross beam 11.
  • the latter comprises a tubular metal section of substantially rectangular cross section whose length is larger than the distance between the two screen side walls 2a, 2b.
  • moving cross beam 11 extends outwards from said walls and the extending ends of said cross beam are each received within a substantially C-shaped metal section 12 which is fastened, for instance by welding, on top of the horizontal upper side of longitudinal side members 3a, 3b.
  • Sections 12 have the concave sides thereof facing towards the materials forward moving direction, shown by arrow F in Figure 6.
  • Moving cross beam 11, whose ends are freely and slidingly supported upon the inner face of the lower side of sections 12, can slide back and forth in that the ends thereof extend through openings 13, 14 formed through wall 2a and through wall 2b respectively.
  • Openings 13 and 14 are provided, to that end, with a larger width compared to that of the moving cross beam 11, thereby establishing the maximum stroke_the latter can move.
  • moving cross beam 11 is provided with two position control screws 15 and 16 cooperating with the additional stationary cross beam to be described in the following, in order to provide for clamping and tensioning of mesh 5.
  • position control screw 15 (and similarly position control screw 16) which is freely rotatable within openings 19 of moving cross beam 11, can be threaded through a nut 17 (18 for position control screw 16) retained within a locking setc- ion 17a (18a) welded to moving cross beam 11 in order to prevent both rotations of nut 17 (18) and longitudinal or transverse displacements of nut 17 (18) relative to moving cross beam 11.
  • outline of sections 17a and 18a may be complementary to that of nut 17,18, for instance U-shaped, and provided with a small radial projection, to prevent longitudinal displacements of said nuts.
  • position control screws 15 and 16 cooperate with a further stationary cross beam shown at 20 comprising, similarly to moving cross beam 11 a substantially rectangular cross section tubular metal section wich is fastened, at the ends thereof, on top of upper side of longitudinal side members 3a, 3b. Said fastening, similarly to the other cases, can be made for instance by welding or bolts, or any other known fashion.
  • stationary cross beam 20 On top of stationary cross beam 20 are applied two strengthening angle sections 21, 22 against which'the ends of position control screws 15, 16 abut when mesh 5 has to be tensioned.
  • position control screws 15 and 16 enable the tensioning of mesh 5 tu be controlled at the centerline portion thereof.
  • the inventive screen provides , as it will now be described in the following, additional means to control said tensioning at the ends of moving cross beam 11, so that mesh 5 can be subjected to a uniform tension over the whole width thereof in order to cooperate in providing that said mesh is subjected to minimum stress during the screening process, while the same screening process can be uniformly carried out over the whole surface of the mesh.
  • the screen according to this invention is provided, at the end of moving cross beam 11, with an additional pair of position control screws 23, 24, cooperating with C-shaped metal, sections 12, besides cooperating with moving cross beam 11.
  • screw 23 extends freely rotatable through the vertical sides of moving cross beam 11, and in particular it is received in openings 40 thereof.
  • a control nut 25 (shown at 26 for screw 24 in Figure 4) is threaded upon screw 23, said nut being mounted on screw 23 after the same has been engaged freely rotatable through an opening 27 of the C-shaped section 12 vertical side.
  • screws 23 and 24 as well can provide for the tensioning of mesh 5 once the V-shaped section 9 of the same has been applied upon extending portion 10 of moving cross beam 11.
  • position control nuts 25 and 26 are turned in an opposite direction, said nuts can move apart from the vertical side of sections 12, thereby enabling moving cross beam 11 to move, and mesh 5 to be unclamped.
  • Tension control of mesh 5 is therefore particularly effective, since it is possible to control said tension in several points of obtaining moving cross beam 11, thereby/perfect flatness of mesh 5 in a transverse direction and a consequent uniform distribution of the materials to be processed over the whole surface of the mesh.
  • the screen according to this invention is completed by a stiffening structure , located underneath mesh 5, and substantially comprising a pair of stringers 28, 29 seen more particularly in' Figure 2, and partially in Figure 6, fastened at their ends to the stationary cross beams 7 and 20 in particular to keep a constant distance therebetween.
  • stringers 28, 29 may very well be missing where longitudinal side members 3a, 3b are made stronger.
  • mesh 5 in addition to being perfectly flat in a transverse direction, perpendicular to direction F, is shown to have a longitudinally upwards convex profile (Figure 3) in a forward moving direction F of the materials to be processed, as shown in Figure 3.
  • the above configuration of mesh 5 is provided through suitable support means thereof, longitudinally positioned at the edges thereof, and transverse thereto.
  • the longitudinally positioned means comprise, for each of the side walls 2b and 2a, a rectilinear section, 2c, 2d respectively, which is fastened in any known fashion to the corresponding wall, e.g. by welding and, as it is particularly apparent from Figure 3 for section 2c, has an upwards convex shape whose radius of curvature will be a function of the type of mesh 5 (or 6) used.
  • Sections 2c, 2d have a constant width, they are substantially perpendicular to walls 2b, 2a, and they perform the function of effective support means for the longitudinal side edges of mesh 5 which upon being tensioned takes the same configuration of said sections 2c, 2d, at the side edges thereof.
  • the transverse means enabling mesh 5 (or 6) to fold over the whole length thereof according to the shape of the side edges thereof, while keeping said mesh perfectly flat in a transverse direction comprise substantially tubular sections 30 extending in a transverse direction, between the two walls 2 b and 2a, and located at different heights as it is apparent in particular from Figure 3, and more particularly at increasing heights starting from the materials inlet and outlet ends, with a maximum height at an intermediate transverse section.
  • the height increase going from a tubular member 30 to the next is properly calculated in order to obtain said mesh 5 upwards convex configuration having an elliptical or similarly shaped longitudinal cross section.
  • Tubular sections 30 whose ends are fastened to the inner surface of walls 2b and 2a in any known fashion, have been chosen with a circular cross section in order to avoid sharp edged transverse folds of mesh 5, or undesirable stresses therewithin. However, they could have a T-shaped cross section as well, on top of which a rubber U-shaped section is applied.
  • mesh 5 is tensioned in an extremely simple nevertheless effective fashion, which consists in longitudinally clamping the same to a stationary cross beam at any one of the mesh ends, while the opposite end is fastened to a moving cross beam whereby tensioning of mesh 5 can be performed and controlled as needed, over the entire mesh length. Therefore, said mesh in addition to laying perfectly flat in a transverse direction and longitudinally convex with a preferred elliptical shape, is effectively clamped also by means of the aforementioned support means. Thus, it becomes particularly stable and therefore free of parasitic vibrations which could terminally damage the equipment when summing up to the normal vibrations found in this type of equipment. In addition, said configuration enables the materials to spread more uniformly over the whole mesh surface, whereby optimum screening conditions are established.
  • replacement of one mesh can be performed without taking apart additional meshes, in that it is only required that the mesh end connected to the moving cross beam 11 is unfastened, whereby said mesh can be longitudinally drawn out from the opposite end of the screen.
  • Installing a new mesh is performed in an opposite sequence, being equally easy. In practice, no mesh has to be removed until it has completely worn out.

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  • Combined Means For Separation Of Solids (AREA)
EP87830099A 1986-03-17 1987-03-17 Simple or multiple type vibrating screen Withdrawn EP0238455A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT19773/86A IT1188446B (it) 1986-03-17 1986-03-17 Vaglio a vibrazione perfezionato,di tipo semplice o multiplo
IT1977386 1986-03-17

Publications (2)

Publication Number Publication Date
EP0238455A2 true EP0238455A2 (de) 1987-09-23
EP0238455A3 EP0238455A3 (en) 1989-06-14

Family

ID=11161104

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87830099A Withdrawn EP0238455A3 (en) 1986-03-17 1987-03-17 Simple or multiple type vibrating screen

Country Status (2)

Country Link
EP (1) EP0238455A3 (de)
IT (1) IT1188446B (de)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4906352A (en) * 1987-08-13 1990-03-06 Production Engineered Products, Inc. Improved tensioning assembly for vibratory screens
WO1992000148A1 (en) * 1990-06-29 1992-01-09 Bengston N.V. Composite vibratory screen
US5203460A (en) * 1992-04-01 1993-04-20 Deister Machine Co., Inc. Tension control apparatus for vibrating screens
WO1993014883A1 (en) * 1992-02-03 1993-08-05 Powerscreen International Distribution Limited Improvements in or relating to screening apparatus
WO2001060531A1 (en) * 2000-02-18 2001-08-23 Douglas Patrick J Screening plant
US6412644B1 (en) * 2000-11-17 2002-07-02 Varco I/P, Inc. Vibratory separator
WO2006037195A1 (en) * 2004-10-06 2006-04-13 Metso Brasil Ind. E Com. Ltda. Structural arrangement for vibrating equipments
US7484625B2 (en) 2003-03-13 2009-02-03 Varco I/P, Inc. Shale shakers and screens with identification apparatuses
WO2009029962A1 (en) * 2007-08-31 2009-03-05 Gavin Campbell Armstrong Screens
US7581647B2 (en) 2002-04-26 2009-09-01 Varco I/P, Inc. Shale shaker
US8631945B1 (en) * 2009-10-09 2014-01-21 James N. Cato Method for screening fine industrial minerals using a vibrating high speed screening unit
CN104174585A (zh) * 2013-05-22 2014-12-03 宝山钢铁股份有限公司 除铁器废铁回收仓矿料筛装置
CN104624485A (zh) * 2014-12-19 2015-05-20 中国矿业大学 快速去除大块物料振动式弛张筛
CN106238304A (zh) * 2016-07-30 2016-12-21 牟伟 一种带有倾斜的筛选使用土的装置
DE102023121746B3 (de) 2023-08-15 2024-10-17 Kleemann Gmbh Siebspanner zum Spannen eines Siebbelags

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112642511B (zh) * 2020-11-20 2022-03-08 含山县仙踪镇在文家庭农场 一种稻谷加工方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2334707A (en) * 1942-01-26 1943-11-23 Allis Chalmers Mfg Co Screen
DE2501750A1 (de) * 1974-01-26 1975-07-31 Powerscreen Int Ltd Schuettelsieb
US4140630A (en) * 1976-09-16 1979-02-20 Durex Products, Inc. Sorting apparatus for fragmented materials
US4319992A (en) * 1980-10-28 1982-03-16 Midwestern Industries, Inc. Material separating machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2334707A (en) * 1942-01-26 1943-11-23 Allis Chalmers Mfg Co Screen
DE2501750A1 (de) * 1974-01-26 1975-07-31 Powerscreen Int Ltd Schuettelsieb
US4140630A (en) * 1976-09-16 1979-02-20 Durex Products, Inc. Sorting apparatus for fragmented materials
US4319992A (en) * 1980-10-28 1982-03-16 Midwestern Industries, Inc. Material separating machine

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4906352A (en) * 1987-08-13 1990-03-06 Production Engineered Products, Inc. Improved tensioning assembly for vibratory screens
WO1992000148A1 (en) * 1990-06-29 1992-01-09 Bengston N.V. Composite vibratory screen
WO1993014883A1 (en) * 1992-02-03 1993-08-05 Powerscreen International Distribution Limited Improvements in or relating to screening apparatus
GB2279891A (en) * 1992-02-03 1995-01-18 Powerscreen Int Distribution Improvements in or relating to screening apparatus
GB2279891B (en) * 1992-02-03 1995-06-07 Powerscreen Int Distribution Improvements in or relating to screening apparatus
US5513756A (en) * 1992-02-03 1996-05-07 Powerscreen International Distribution Limited Screening apparatus having a screen tensioning device
US5203460A (en) * 1992-04-01 1993-04-20 Deister Machine Co., Inc. Tension control apparatus for vibrating screens
WO2001060531A1 (en) * 2000-02-18 2001-08-23 Douglas Patrick J Screening plant
US6412644B1 (en) * 2000-11-17 2002-07-02 Varco I/P, Inc. Vibratory separator
US6715611B2 (en) 2000-11-17 2004-04-06 Tuboscope I/P, Inc. Vibratory separator
US7581647B2 (en) 2002-04-26 2009-09-01 Varco I/P, Inc. Shale shaker
US7484625B2 (en) 2003-03-13 2009-02-03 Varco I/P, Inc. Shale shakers and screens with identification apparatuses
WO2006037195A1 (en) * 2004-10-06 2006-04-13 Metso Brasil Ind. E Com. Ltda. Structural arrangement for vibrating equipments
WO2009029962A1 (en) * 2007-08-31 2009-03-05 Gavin Campbell Armstrong Screens
US8631945B1 (en) * 2009-10-09 2014-01-21 James N. Cato Method for screening fine industrial minerals using a vibrating high speed screening unit
CN104174585A (zh) * 2013-05-22 2014-12-03 宝山钢铁股份有限公司 除铁器废铁回收仓矿料筛装置
CN104624485A (zh) * 2014-12-19 2015-05-20 中国矿业大学 快速去除大块物料振动式弛张筛
CN106238304A (zh) * 2016-07-30 2016-12-21 牟伟 一种带有倾斜的筛选使用土的装置
CN106238304B (zh) * 2016-07-30 2018-09-18 江苏凯越建设工程有限公司 一种筛选使用土的装置
DE102023121746B3 (de) 2023-08-15 2024-10-17 Kleemann Gmbh Siebspanner zum Spannen eines Siebbelags

Also Published As

Publication number Publication date
EP0238455A3 (en) 1989-06-14
IT1188446B (it) 1988-01-14
IT8619773A0 (it) 1986-03-17

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