US3706376A - Screen with differently tensioned surface zones - Google Patents

Screen with differently tensioned surface zones Download PDF

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Publication number
US3706376A
US3706376A US46197A US3706376DA US3706376A US 3706376 A US3706376 A US 3706376A US 46197 A US46197 A US 46197A US 3706376D A US3706376D A US 3706376DA US 3706376 A US3706376 A US 3706376A
Authority
US
United States
Prior art keywords
netting
path
flow
tensioned
striker
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 - Lifetime
Application number
US46197A
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English (en)
Inventor
Rudolf J Krause
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.)
Rhewum GmbH
Original Assignee
Rheinische Werkzeug & Maschf
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 Rheinische Werkzeug & Maschf filed Critical Rheinische Werkzeug & Maschf
Application granted granted Critical
Publication of US3706376A publication Critical patent/US3706376A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B07B1/50—Cleaning
    • B07B1/54—Cleaning with beating devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/20—Vibrating the filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/28—Strainers not provided for elsewhere
    • 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
    • B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
    • B07B1/34—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens jigging or moving to-and-fro perpendicularly or approximately perpendiculary to the plane of the screen
    • B07B1/346—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens jigging or moving to-and-fro perpendicularly or approximately perpendiculary to the plane of the screen with electromagnets
    • 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

  • ABSTRACT v A sifting machine has a strainer box defining feed-in and discharge points and a free sieve netting surface [30] Forelgn Application Pnomy Dam arranged and tensioned in the strainer box so that a June 13, 1969 Germany ..G 69 23765.6 material flow-path is defined across it from the feed-in point to the discharge point.
  • a plurality of striker as- [52] US. Cl. ..209/347, 209/365, 209/382, semblies may also be arranged in the strainer box for 209/404 exciting the netting surface.
  • Similar devices may be provided along at 2,804,208 8/1957 Van Hardefeld etal. ..209/403 least edge of the netting Parallel to the material 1,904,032 4/1933 Roberts....- ..209/382 x individually tensioning netting the 3,070,230 12/1962 Peterson ..209/310 direction of the -P at different P Spaced 3,225,926 12/1965 Dostatni ..209/368 x transversely the direction of the -P
  • the 359,544 3/l887 Russell et ah Wang/357 x stnker assembhes may be operated synchronously or 878,728 2/1908 Harrop ..209/382 x asynchmnously- Blod ett across' ..209 347 2131 13322 5%;? Cole ..209 4 03x 7 Clam, 8 Draw PATENTED DEC 19 I972 SHEET 2 OF 2 FIG.G
  • the invention relates to a sifting machine of a known type having a strainer box, a sieve netting'sheet constructed of a wire netting or a textile netting having properties similar to a wire netting, a feed inlet and a discharge opening for the material, and striker assemblies for the excitation of the sieve netting.
  • the sifting characteristic obtained is determined by the tension of the netting and is substantially uniform and unchangeable; its intensity being influenceable only by the variations in the strikers.
  • This uniform intensity causes the netting to be stressed differently and it can not be adapted to these variations. Consequently the netting is quickly destroyed.
  • the netting tension can not follow the varying operating conditions during the passage of the material to be screened from the feed-in point to the discharge point, so that the sifting process is also incomplete.
  • the netting tension may, for example, fall in stages from a substantial pretensioning nearest the feed-in point to just the tension of the material just before the discharge point; which even with synchronism of the strikers produces substantially improved sifting results.
  • the sifting machine can meet all possible conditions imposed on it and realize an optimum result for the siftingprocess as a result.
  • a further development of the significant inventive idea of the present invention provides for tensioning the netting surface at different points into different tension levels in the direction of conveyance, which different tension levels can also be individually applied. This measure substantially increases the possibilities for variations of the tensioning during the operation of the sifting machine in that, for example, the netting is provided, in the longitudinal, or conveying direction with alternating longitudinal tension levels which may be more or less strongly tensioned.
  • a feature of the present invention is that the edges of the sheet of netting are in engagement with fastening and tensioning elements corresponding to the extent and distribution of the tension levels; which elements together, except for the separating spaces between adjacent levels, clamp the edges of the netting without interruption.
  • a further feature of the present invention is that the strikers associated with the different tension levels have a common drive.
  • strikers include beater levers which are disposed on a vibrating shaft mounted in the machine frame and extending transversely below the netting surface.
  • a particularity for providing a punctiform striker is that protruding circular heads, cups or plates having small diameters are disposed on the vibrating beater levers.
  • th pivot bearings for the vibrating shaft of the strikers are rubber bearings and the vibrating shaft of the strikers is coupled, via a lever, with an electromagnetic drive which ismounted, as are the pivot bearings, to the frame of the machine.
  • a sifting machine constructed according to the present invention permits the arbitrary use of a drive subdivided into zones in cooperation with a netting surface which can also be tensioned to different levels corresponding to the zones; the movable parts being insertable into the strainer box in a dustfree, airtight, waterfree and maintenance-free manner while the easy exchangeability of a free sieve netting surface is maintained.
  • FIG. 1 is a top plan view of a sieve netting surface arranged in the frame of a strainer box.
  • FIG, 2 is a side elevation, cross-sectional view of the device of FIG. 1.
  • FIG. 3 is a portion of FIG. 2 in reverse orientation.
  • FIG. 4 is a cross-sectional view taken generally along line A-A of FIG. 5 of a detail on an enlarged scale of FIG. 2, showing a fastening and tensioning element.
  • FIG. 5 is a top plan partial view of the detail of FIG. 4.
  • FIG. 6 is a side-elevation schematic view of a sifting machine according to the present invention which has a plurality of striker assemblies.
  • FIG. 7 is a detail of a striker assembly taken at right angles with respect to FIG. 6.
  • FIG. 8 is a top plan view of the sifting machine of FIG. 6.
  • FIGS. 1 through show an embodiment of the present invention without striker assemblies.
  • FIG. 1 shows a sheet of sieve netting l firmly clamped to a frame 2 of a sifting machine by means of a plurality of fastening and tensioning elements such as clamps 3 to define a screening surface.
  • Clamps 3 are distributed along the edges of the netting l in correspondence with the number of tension levels desired. The exact spacing of the clamps 3 is, of course, a matter of choice.
  • six tension levels, numbered I VI are provided transverse to the conveying or arrow direction. Accordingly, six pairs of clamps 3 are oppositely disposed along both longitudinal edges of the netting 1.
  • FIGS. 2-5 show the details of the clamps 3.
  • the clamps 3 include jaws 12 which serve to clamp the netting 1 to a base plate 12 by means of a bolt and nut 13.
  • a bolt 14 is provided to adjust the tension of the netting 1 by moving it in a direction perpendicular to the extent of frame member 2.
  • This arrangement permits the clamps 3 to be tensionable independently of one another so that the desired pretensioning of the netting can be individually set at different levels.
  • the tensioning at a given point along the netting can be different from any other point along the netting.
  • FIGS. 6-8 show a sifting machine with striker assemblies that may use the tensioning concept set out above. That is, a netting 1 may again be fastened and tensioned by a plurality of clamps 3.
  • the strainer box 6 is provided with an inlet and an outlet 16, between which the netting 1 extends.
  • a plurality of striker assemblies are arranged beneath the surface of the netting 1.
  • Each striker assembly is made up of a beater lever 8 which has a head 9 and is fastened to a shaft 7 mounted in rubber bearings 5 in the wall of the strainer box 6 (FIGS. 6 and 7).
  • Circular head 90f FIGS. 6-8 may have the form of a cup or plate as well.
  • the shaft 7 is connected to a known electromagnetic drive 10 by means of a lever 11. This arrangement permits the shaft 7 to vibrate in the rubber bearings, utilizing the elasticity of the rubber to vibrate in tune with the drive 10.
  • the drive 10 is driven in a known manner at the line frequency, and emits high-frequency harmonics when lever 11 contacts it, so that the armature vibrations of the drive 10 are transmitted to the shaft 7 via lever 11.
  • the rubber bearings 5 additionally provide a dust-free and maintenance free bearing for the shaft 7.
  • the striker assemblies are arranged to occupy defined zones which are associated with the respective tension levels, as can be seen from FIG. 8. These zones are also identified by the numbering I-VI.
  • a plurality of strikers in one of the zones I-VI may be mounted on a common shaft 7 connected to a single drive 10. This provides a common drive for all of the strikers of a common transverse zone.
  • the striker assemblies associated with the various zones can be driven either synchronously or asynchronously by suitable control means that is well known in the art. For example, each drive 10 could be adjusted manually. Therefore, the netting can be controlled by imposing varying tension levels-as well as by the excitation of the striker assemblies.
  • the sifting machine according to the present invention can be adapted to any desired requirements.
  • a sifting machine including a strainer box with feed-in and discharge points therein, a one-piece netting defining a material flow surface and having two opposite end portions, two opposite lateral edge portions and a free portion extending from one of the edge portions to the other, means for fastening the two lateral edges to the strainer box to thereby tension the netting, the netting defining a flow-path for the material to be screened said flow-path extending from a feedin point at one end portion of the screen to a discharge point at the other end portion of .the screen and extending longitudinally over the free portion of the netting, and a plurality of striker assemblies arranged in the strainer box adjacent to the free portion of the netting for direct excitation of the netting, the improvement wherein the fastening means comprise a plurality of individual fastening devices which are arranged along the lateral edge portions of the netting and are spaced in the direction of the flow-path for individually tensioning the netting, in
  • fastening means comprise a plurality of further individual fastening devices which are spaced along one of said end portions for individually tensioning the netting, in the direction of the flow-path, at different points spaced transversely to the direction of the flowpath such that the netting is longitudinally tensioned to different tensions along the transverse direction.
  • each of said striker assemblies has a beater lever and a vibrating shaft mounted in the strainer box and operatively coupled with said common drive and said beater lever, and wherein said striker assemblies are arranged below the netting surface.
  • I060ll 0571 sifted flows along a flow-path extending from one end of the net to the other and between the lateral edges of the net, in a direction transverse to the flow-path such that the netting is tensioned to different tensions at different points spaced in the direction of the flow-path, and applying separate striker excitation to the differently tensioned portions of the netting.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Preliminary Treatment Of Fibers (AREA)
US46197A 1969-06-13 1970-06-15 Screen with differently tensioned surface zones Expired - Lifetime US3706376A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE6923765U DE6923765U (de) 1969-06-13 1969-06-13 Siebmaschine

Publications (1)

Publication Number Publication Date
US3706376A true US3706376A (en) 1972-12-19

Family

ID=6602888

Family Applications (1)

Application Number Title Priority Date Filing Date
US46197A Expired - Lifetime US3706376A (en) 1969-06-13 1970-06-15 Screen with differently tensioned surface zones

Country Status (10)

Country Link
US (1) US3706376A (enExample)
JP (1) JPS4943298B1 (enExample)
AT (1) AT301471B (enExample)
BE (1) BE751334A (enExample)
CA (1) CA925824A (enExample)
DE (1) DE6923765U (enExample)
FR (1) FR2049899A5 (enExample)
GB (1) GB1316628A (enExample)
LU (1) LU61067A1 (enExample)
NL (1) NL149717B (enExample)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3970549A (en) * 1973-06-18 1976-07-20 Linatex Corporation Of America Screen assembly and dewatering technique
US4505812A (en) * 1983-03-30 1985-03-19 Ilecard Pty. Limited Sieve screen deck
WO1992003231A1 (en) * 1990-08-20 1992-03-05 Carpenter Robert C Adjustable tension silk screen frame
US5220867A (en) * 1991-07-15 1993-06-22 Carpenter Robert C Adjustable tension silk screen frame
US20080022868A1 (en) * 2001-01-16 2008-01-31 Furetsu Kasuya Device and method for tensioning a screen on a screen printing frame
CN104070013A (zh) * 2014-06-28 2014-10-01 济南中燃科技发展有限公司 一种筛条打击装置
CN106964543A (zh) * 2017-04-12 2017-07-21 北京圣开景科技有限公司 一种张弛筛杠杆传动系统
AU2021336023B2 (en) * 2020-09-02 2025-01-23 Bühler Insect Technology Solutions Ag Stretching-shaft screening device for separating insects, in particular insect larvae, or worms and residual material, and the use of such a stretching-shaft screening device

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATA27179A (de) * 1978-01-25 1981-05-15 Licentia Gmbh Grossflaechiges schwingnutzgeraet
AT389062B (de) * 1986-04-21 1989-10-10 Ife Gmbh Siebvorrichtung
CN117225697B (zh) * 2023-11-14 2024-01-30 铁鑫工程检测有限公司 一种混凝土筛分装置

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US359544A (en) * 1887-03-15 ceagin
US878728A (en) * 1907-05-09 1908-02-11 Richardson Lovejoy Engineering Company Wire screen.
US1477028A (en) * 1922-02-16 1923-12-11 Frank J Seidl Grain-cleaning machine
FR578893A (fr) * 1924-03-20 1924-10-06 Tamis pour dépoussiéreur
FR627027A (fr) * 1926-01-12 1927-09-24 Claie à gravier, en particulier pour dragues à gravier
US1904032A (en) * 1931-01-16 1933-04-18 Benjamin F Roberts Apparatus for screening materials
US2010256A (en) * 1932-04-12 1935-08-06 Cole David Screening machine
US2114406A (en) * 1936-05-12 1938-04-19 Lowe E Simpson Sieve frame
US2134240A (en) * 1937-01-30 1938-10-25 Seth P Sowder Shaker screen
US2804208A (en) * 1952-07-19 1957-08-27 Stamicarbon Vibrating screen
US3070230A (en) * 1958-12-12 1962-12-25 Lottie J Peterson Apparatus for separating materials
US3225926A (en) * 1961-09-08 1965-12-28 Prep Ind Combustibles Vibrating sieves

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US359544A (en) * 1887-03-15 ceagin
US878728A (en) * 1907-05-09 1908-02-11 Richardson Lovejoy Engineering Company Wire screen.
US1477028A (en) * 1922-02-16 1923-12-11 Frank J Seidl Grain-cleaning machine
FR578893A (fr) * 1924-03-20 1924-10-06 Tamis pour dépoussiéreur
FR627027A (fr) * 1926-01-12 1927-09-24 Claie à gravier, en particulier pour dragues à gravier
US1904032A (en) * 1931-01-16 1933-04-18 Benjamin F Roberts Apparatus for screening materials
US2010256A (en) * 1932-04-12 1935-08-06 Cole David Screening machine
US2114406A (en) * 1936-05-12 1938-04-19 Lowe E Simpson Sieve frame
US2134240A (en) * 1937-01-30 1938-10-25 Seth P Sowder Shaker screen
US2804208A (en) * 1952-07-19 1957-08-27 Stamicarbon Vibrating screen
US3070230A (en) * 1958-12-12 1962-12-25 Lottie J Peterson Apparatus for separating materials
US3225926A (en) * 1961-09-08 1965-12-28 Prep Ind Combustibles Vibrating sieves

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3970549A (en) * 1973-06-18 1976-07-20 Linatex Corporation Of America Screen assembly and dewatering technique
US4505812A (en) * 1983-03-30 1985-03-19 Ilecard Pty. Limited Sieve screen deck
WO1992003231A1 (en) * 1990-08-20 1992-03-05 Carpenter Robert C Adjustable tension silk screen frame
US5220867A (en) * 1991-07-15 1993-06-22 Carpenter Robert C Adjustable tension silk screen frame
US20080022868A1 (en) * 2001-01-16 2008-01-31 Furetsu Kasuya Device and method for tensioning a screen on a screen printing frame
US7497159B2 (en) * 2001-01-16 2009-03-03 Furetsu Kasuya Device and method for tensioning a screen on a screen printing frame
CN104070013A (zh) * 2014-06-28 2014-10-01 济南中燃科技发展有限公司 一种筛条打击装置
CN106964543A (zh) * 2017-04-12 2017-07-21 北京圣开景科技有限公司 一种张弛筛杠杆传动系统
AU2021336023B2 (en) * 2020-09-02 2025-01-23 Bühler Insect Technology Solutions Ag Stretching-shaft screening device for separating insects, in particular insect larvae, or worms and residual material, and the use of such a stretching-shaft screening device

Also Published As

Publication number Publication date
DE6923765U (de) 1969-10-09
GB1316628A (en) 1973-05-09
LU61067A1 (enExample) 1970-08-10
AT301471B (de) 1972-09-11
NL7008035A (enExample) 1970-12-15
JPS4943298B1 (enExample) 1974-11-20
CA925824A (en) 1973-05-08
BE751334A (fr) 1970-11-16
NL149717B (nl) 1976-06-15
FR2049899A5 (enExample) 1971-03-26

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