EP0706837A1 - Cadre de tamis - Google Patents

Cadre de tamis Download PDF

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Publication number
EP0706837A1
EP0706837A1 EP95116155A EP95116155A EP0706837A1 EP 0706837 A1 EP0706837 A1 EP 0706837A1 EP 95116155 A EP95116155 A EP 95116155A EP 95116155 A EP95116155 A EP 95116155A EP 0706837 A1 EP0706837 A1 EP 0706837A1
Authority
EP
European Patent Office
Prior art keywords
screen
screen frame
frame according
sides
short
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Withdrawn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
EP95116155A
Other languages
German (de)
English (en)
Inventor
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.)
Isenmann Siebe GmbH
Original Assignee
Isenmann Siebe GmbH
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 Isenmann Siebe GmbH filed Critical Isenmann Siebe GmbH
Publication of EP0706837A1 publication Critical patent/EP0706837A1/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Withdrawn legal-status Critical Current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
    • 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
    • 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
    • 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
    • B07B2201/00—Details applicable to machines for screening using sieves or gratings
    • B07B2201/02—Fastening means for fastening screens to their frames which do not stretch or sag the screening surfaces

Definitions

  • the invention relates to a screen frame with the features of the preamble of claim 1.
  • Sieve frames made of steel and wood are known, to which a sieve grid or a sieve mesh made of steel wire is welded or screwed.
  • sieves made of rubber or polyurethane are known in which the sieve grid and the sieve frame are cast in one piece.
  • the known sieve frames are supplied in dimensions that are suitable for use in standardized sieving machines.
  • the known sieve frame is disadvantageous that when using sieves that are integrally connected to the sieve frame, the entire frame must be replaced as soon as the sieve has reached the wear limit.
  • the frame in the area of its long sides is made of a rubber-elastic material and is provided with a reinforcement, the screen frame can easily be re-covered when the screen wires wear, so that the screen frame can be used several times.
  • Cross webs are preferably arranged between the long sides of the screen frame and fix the screen wires in the transverse direction.
  • the crossbars preferably run parallel to the short sides. If the short sides have grooves running parallel to the long sides on their upper side, the screen wires can be clamped into the short sides in such a way that they do not protrude beyond the short sides on their upper side.
  • the grooves in the short sides are preferably distributed equidistantly, so that there is a uniform distance between the individual screen wires in the transverse direction.
  • the screen wires are also lowered in the area of the crossbars relative to the top of the screen frame.
  • the crossbars preferably have the same number of grooves as the short sides.
  • a particularly favorable embodiment of the sieve frame according to the invention is obtained if the reinforcement of the long sides with the frame lying flat is curved convexly towards the top. Then namely seen from above, the sieve frame is bent concavely so that the sieve wires can be hung on the short sides. When the sieve frame is then brought into its flat position, which leads to tension in the sieve wires, the convexly curved reinforcements resist the tension force of the sieve wires, which leads to the frame lying flat.
  • the screen frames are preferably provided with a recess on the underside of the short sides in the area facing away from the crossbars, because then the suspended screen wires on the short sides do not protrude beyond the underside of the screen frame. If the depth of the grooves in the short sides or in the transverse webs is greater than the width of the grooves, which corresponds to the thickness of the sieve wire provided, the sieve wire can be lowered against the surface of the sieve frame. The crosspieces then take on a certain task when loosening the screened material.
  • the sieve wires run parallel to the long sides if a sieve wire runs from a groove in one short side to the corresponding groove on the opposite short side, the sieve wires being hung into the groove with an end thickening. A large number of appropriately assembled sieve wires is then required to re-tension the sieve.
  • Another embodiment results when a single continuous screen wire runs from a groove adjacent to the long side of a first short side to the opposite groove of the other short side, i.e. parallel to the long side, from there to the immediately adjacent groove of the same short side and from this runs back to the first page, etc., to the last free groove. It will So a single screen wire between the short sides repeatedly back and forth, so that ultimately also a screen with several screen wires is created, but only a long, pre-assembled screen wire is required to re-cover the screen frame.
  • the depth of the grooves in the region of the short sides is preferably greater than the depth of the grooves in the region of the transverse webs, because then the sieve wire stretched longitudinally over the sieve through the grooves is given an essentially arcuate curvature. This curvature reduces wear on the screen wires in the area of the short sides.
  • the reinforcement of the long sides is more convexly curved towards the upper side when the frame is lying flat than the sieve wires are bent due to the different groove depths. Then there is a tension with the frame lying flat because the tension of the screen wires tends to bring the reinforcement into a straight position, but the straight position of the reinforcement can only be reached by stretching the screen wires.
  • the sieve wires When the sieve wires are covered, the sieve frame can initially be bent in such a configuration, with its reinforcement in a straight position. Then the screen wires can be stretched through the grooves and the frame can be laid flat so that the reinforcement reaches the arcuate position. If the radii of curvature of the reinforcements and the screen wires have the above-mentioned ratios, the screen frame will remain flat because the bends shown represent a dead center to be overcome.
  • a sieve frame according to the invention is denoted overall by 1.
  • the sieve frame 1 comprises two straight long sides 2, two short sides 3 arranged at the ends between the long sides 2 and perpendicular to them, and between the short sides parallel to these and perpendicular to the long sides 2 transverse webs 4.
  • the screen frame 1 is flat and rectangular in the position shown in Figure 1. Like the short sides 3, the cross struts are provided with grooves on their upper side at a uniform distance parallel to the long sides 2. The grooves are intended to receive the screen wires to be clamped onto the screen frame 1 and to fix them in the transverse direction, that is in a direction perpendicular to the longitudinal extension of the long sides 2.
  • FIG. 2 shows a cross section through a short side 3 of the sieve frame 1, specifically in the area between the grooves.
  • the viewing direction of FIG. 2 runs in the direction of the short sides, ie towards the long side 2.
  • the short side 3 is essentially rectangular in cross section, the height in the region facing the adjacent cross strut 4 corresponding to the height of the long sides 2.
  • a recess 5 is provided on the short sides 3 on the underside of the sieve frame 1, ie opposite the grooves from FIG. 1.
  • the recess 5 is open towards the underside of the sieve frame 1 and creates a space below the short sides 3 between the short side 3 and the plane defined by the underside of the long sides 2.
  • a reinforcement 6 is incorporated into the short sides, which stabilizes the short sides.
  • the short pages 3 are one rubber-elastic material.
  • a sieve wire 7 is guided through a groove of the short side 3, which is not visible in FIG. 2, and its end facing the interior of the sieve frame runs parallel to the long sides 2. In the region of the short sides, the sieve wire 7 is guided down into the recess 5, where it is angled at right angles and continues from the viewing level.
  • FIG. 3 shows a cross bar 4 in cross section, which is arranged at right angles to a long side 2.
  • the cross section runs as in FIG. 2 in an area in which no groove is provided.
  • the crossbar 4 is also provided in its interior with a reinforcement 6, which is surrounded by rubber-elastic material. Through a not recognizable groove, the screen wire 7 is continued parallel to the long side.
  • FIG. 4 shows a longitudinal section through a screen frame according to the invention in the region of the long side and parallel to the long side.
  • a reinforcement 10 is incorporated, which stabilizes the long side 2 in its longitudinal direction to pressure loads.
  • the reinforcement 10 is slightly shorter than the distance between the two recesses 5 in the short sides 3 of the screen frame.
  • the reinforcement 10 lies on the reinforcement 6 of the short sides 3 and is guided in an arc between the short sides over the reinforcement 6 of the crossbars.
  • the reinforcement 10 of the long sides 2 thus describes, between the reinforcements of the short sides, an arc facing the working surface of the sieve, that is to say curved upward in the use position.
  • FIG. 5 shows a cross section through a Sieve frame according to the invention parallel to the section of Figure 4, but shown running in the interior of the sieve frame by grooves.
  • the short sides 3 and the transverse webs 4 with their reinforcements 6 are shown in cross-section and carry the screen wire 7 in the region of the grooves above the reinforcements 6.
  • the screen wire 7 is curved upward in a slightly arcuate manner, because the grooves in the region of the transverse webs 4 are less deep than in the region of the short sides 3.
  • FIG. 6 shows a sieve frame 1 which has just been strung with sieve wires 7.
  • the sieve frame 1 is bent during the covering so that the short sides point upwards in relation to the transverse webs. So it is concave when viewed from the back. This bend means that the short sides 3 approach each other slightly in the straight line, so that sieve wires 7 of a certain length can be hooked into the end grooves of the short sides 3.
  • the sieve frame 1 with suspended sieve wires 7 is now brought back into the flat position, the sieve wires 7 are tensioned. The tensile force of the screen wires 7 is absorbed by the reinforcements 10 of the long sides 2.
  • FIG. 7 shows a top view of a corner region of a screen frame according to the invention, the relative position of the reinforcements 10 and 6 being shown with dashed lines Lines is indicated. It can be seen that the reinforcements 10 and 6 intersect in the corner region of the screen frame 1.
  • screen wires 7 are shown, which lie in the grooves of the short side 3 and run down into the plane of the drawing.
  • the upper sieve wire 7 in FIG. 7 has at its end a thickening 12 which is arranged below the relevant groove in the recess 5.
  • FIG. 7 also shows the line III-III along which the section according to FIG. 2 runs.
  • FIG. 8 shows the section through the sieve frame along line II from FIG. 7. It is shown how the reinforcement 10 is arranged in relation to the reinforcement 6, the upper side, ie the useful side of the sieve, on the right and the lower side in FIG is shown on the left.
  • the thickening 12 provided on the sieve wire 7 at one end is arranged in the recess 5 and holds the free end of the sieve wire fixed in the recess 5. It can also be seen how the screen wire 7 is guided through the recess 5 below the useful side of the screen from one groove to the adjacent groove.
  • FIG. 9 shows a section along the line II-II from FIG.
  • the screen wires 7 lie in the region of the short side 3 in grooves which correspond in width to the diameter of the screen wires and whose depth is greater than the diameter the sieve wires so that the sieve wires lie in the area of the short sides below the top of the sieve frame.
  • the screen wires are also, as shown here in cross section, provided with a tension core 14 which can absorb the load and tension forces that occur during operation.
  • Figure 10 finally shows a section corresponding to that of Figure 9, with various alternatives for the design of the groove cross sections are shown.
  • the groove cross sections shown in FIG. 10 can prevent the sieve wire 7 from slipping out of the groove during operation.
  • the screen frame according to the invention is used in practice as follows:
  • the sieve frame 1 consists essentially of the long sides 2, the short sides 3 and the transverse webs 4, which are stabilized with reinforcements 10 and 6.
  • the reinforcements 10 and 6 are surrounded in one piece by rubber-elastic material, for example polyurethane.
  • the sieve frames 1 are designed in a standard format which is suitable for use in sieving machines.
  • the sieve frame according to the invention is bent up on the short sides, so that a pre-assembled sieve wire can be hung in an outer groove of a short side 3. Then the screen wire is guided parallel to the long side to the corresponding opposite groove of the other short side 3.
  • Another possibility of covering the sieve frame 1 according to the invention lies in the use of a single, long sieve wire, which is first hung in an end groove of a short side 3 with its thickening 12 in the recess 5, which is then guided to the corresponding opposite groove , from there down into the recess 5 and to the adjacent groove, then again runs parallel back to the groove that is adjacent to the groove initially used, and so on until all the grooves of the sieve frame 1 according to the invention are filled.
  • the long sieve wire 7 used here must then also carry a thickening 12 at its other end at the appropriate distance, which is then hung into the recess 5. Otherwise, the sieves behave essentially the same with a long sieve wire or a number of short sieve wires.
  • the advantage of the sieve frame according to the invention is that the sieve wires can be easily replaced when the wear limit is reached, and the sieve frame can continue to be used if the latter has not also reached its wear limit. Usually, however, the service life of a sieve frame is considerably longer than that of the sieve wires.
  • the screen wires are provided with traction cores so that the clamping and load forces that occur during operation can be absorbed with a small diameter.
  • the pull soul is coated with plastic, e.g. polyurethane, which has proven to be an extremely wear-resistant coating when screening broken minerals.
  • the sieve wires 7 are lowered relative to the transverse webs 4 and the short sides 3, i. that is, if they are in grooves that are deeper than they are wide, the crossbars take on part of the work when processing the screened material. The sieve wires are then in a more protected position, so that the wear of the sieve wires is reduced.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Combined Means For Separation Of Solids (AREA)
EP95116155A 1994-10-14 1995-10-13 Cadre de tamis Withdrawn EP0706837A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4436788 1994-10-14
DE4436788A DE4436788C2 (de) 1994-10-14 1994-10-14 Siebrahmen

Publications (1)

Publication Number Publication Date
EP0706837A1 true EP0706837A1 (fr) 1996-04-17

Family

ID=6530800

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95116155A Withdrawn EP0706837A1 (fr) 1994-10-14 1995-10-13 Cadre de tamis

Country Status (2)

Country Link
EP (1) EP0706837A1 (fr)
DE (1) DE4436788C2 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2322590A (en) * 1997-03-01 1998-09-02 United Wire Ltd Filtering screen and support frame therefor
WO2010058053A1 (fr) * 2008-11-19 2010-05-27 Munoz Corral Cayo Améliorations apportées à des armatures métalliques pour mailles de tamisage en polyuréthanne ou autre matière synthétique
EP2249973A2 (fr) * 2008-02-11 2010-11-17 M.I L.L, C. Arc préférentiel sur des tamis composites
WO2019006533A1 (fr) * 2017-07-05 2019-01-10 Fp Canmechanica Inc. Ensemble tamis pour machine de tamisage vibrante
CN110225799A (zh) * 2017-10-25 2019-09-10 藤野工业株式会社 振动筛机

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE712190C (de) * 1938-05-10 1941-10-14 Louis Herrmann Fa Drahtsieb
GB691617A (en) * 1950-09-25 1953-05-20 John Howard Booth Improvements in or relating to wire screens for the washing of minerals
GB884432A (en) * 1958-07-17 1961-12-13 Formica Int Screens or sieves of plastics material
GB2014480A (en) * 1978-02-17 1979-08-30 Powerscreen Ltd Screening deck
US4219412A (en) * 1977-04-07 1980-08-26 N. Greening Limited Screening machines
DE8811079U1 (fr) * 1987-10-31 1988-10-20 Steinhaus Gmbh, 4330 Muelheim, De

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE858231C (de) * 1949-06-28 1952-12-04 Erzbergbau Salzgitter G M B H Schwingendes Spaltsieb zum Klassieren von feuchtem, klebrigem Schuettgut
US4375408A (en) * 1981-08-05 1983-03-01 Uop Inc. Elastomeric framing member for screen deck panel
DE3515937A1 (de) * 1985-05-03 1986-11-06 Hein, Lehmann AG, 4000 Düsseldorf Siebbelag fuer eine siebmaschine
GB8919204D0 (en) * 1989-08-23 1989-10-04 Powerscreen Int Distribution Screening apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE712190C (de) * 1938-05-10 1941-10-14 Louis Herrmann Fa Drahtsieb
GB691617A (en) * 1950-09-25 1953-05-20 John Howard Booth Improvements in or relating to wire screens for the washing of minerals
GB884432A (en) * 1958-07-17 1961-12-13 Formica Int Screens or sieves of plastics material
US4219412A (en) * 1977-04-07 1980-08-26 N. Greening Limited Screening machines
GB2014480A (en) * 1978-02-17 1979-08-30 Powerscreen Ltd Screening deck
DE8811079U1 (fr) * 1987-10-31 1988-10-20 Steinhaus Gmbh, 4330 Muelheim, De

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2322590A (en) * 1997-03-01 1998-09-02 United Wire Ltd Filtering screen and support frame therefor
GB2322590B (en) * 1997-03-01 1999-12-01 United Wire Ltd Improved filtering screen and support frame therefor
EP2249973A2 (fr) * 2008-02-11 2010-11-17 M.I L.L, C. Arc préférentiel sur des tamis composites
EP2249973A4 (fr) * 2008-02-11 2013-06-19 Mi Llc Arc préférentiel sur des tamis composites
US8597559B2 (en) 2008-02-11 2013-12-03 M-I L.L.C. Method of making a shaker screen
US10272473B2 (en) 2008-02-11 2019-04-30 M-I L.L.C. Method of making a shaker screen
WO2010058053A1 (fr) * 2008-11-19 2010-05-27 Munoz Corral Cayo Améliorations apportées à des armatures métalliques pour mailles de tamisage en polyuréthanne ou autre matière synthétique
WO2019006533A1 (fr) * 2017-07-05 2019-01-10 Fp Canmechanica Inc. Ensemble tamis pour machine de tamisage vibrante
CN110225799A (zh) * 2017-10-25 2019-09-10 藤野工业株式会社 振动筛机
EP3549683A4 (fr) * 2017-10-25 2020-08-12 Fujino Industries Co., Ltd. Machine à tamis vibrant
US11130156B2 (en) * 2017-10-25 2021-09-28 Fujino Industries Co., Ltd. Vibrating sieve machine

Also Published As

Publication number Publication date
DE4436788A1 (de) 1996-04-18
DE4436788C2 (de) 2002-01-31

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