EP0278124A1 - A rotating sieving apparatus with a number of sieving surfaces each of which is subdivided into a number of concentric rings with reversible and continuously regulatable angular-velocities - Google Patents
A rotating sieving apparatus with a number of sieving surfaces each of which is subdivided into a number of concentric rings with reversible and continuously regulatable angular-velocities Download PDFInfo
- Publication number
- EP0278124A1 EP0278124A1 EP87202470A EP87202470A EP0278124A1 EP 0278124 A1 EP0278124 A1 EP 0278124A1 EP 87202470 A EP87202470 A EP 87202470A EP 87202470 A EP87202470 A EP 87202470A EP 0278124 A1 EP0278124 A1 EP 0278124A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sieving
- annular
- angular
- conical
- sieving apparatus
- 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.)
- Granted
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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
- B07B1/08—Screens rotating within their own plane
Definitions
- the invention relates to a rotatable sieving apparatus in accordance with the preamble to claim 1.
- Apparatus of this type is known from NL-B-179.709 in which a good sieving action is already obtained with a reasonable processing capacity using a single sieving surface.
- the sieving action decreases commensurately and makes the use of a second underlying sieving-surface necessary in order to maintain the same good sieving action; this means the use of a more complicated, larger and costlier sieving apparatus.
- the object of the invention is to provide a sieving apparatus of the type described in the preamble hereto and in which, in addition to maintaining a good sieving action, the processing capacity can be considerably increased whilst at the same time a less complicated, smaller and cheaper sieving apparatus is obtained than is possible with one in which a number of sieving surfaces lie one above another.
- this object is achieved by taking the measures outlined in the characterising clause to claim 1 and through which the processing capacity for some products can be increased by 50% whilst still maintaining the same degree of sieving quality.
- a rotating-surface sieving apparatus is known from DE-B-440.697 AD 1925 and which apparatus incorporates two flat sieving-surfaces one lying above the other and the upper one of which is of circular form and the the lower one of which is of annular form.
- the product to be sieved is thrown off the circular upper sieving-surface and collides with a cylindrical return-plate encircling the latter and then falls onto the annular lower sieving-surface.
- the latter is driven at a lower angular-velocity than the upper sieving-surface. Both angular-velocities are constant however and driven from the same central driving shaft. Collision of the sieved product against the cylindrical return-plate has an unfavourable effect on the product.
- the sieving apparatus comprises a central conically-formed sieving-surface 1, the unperforated apex of the cone of which is directed upward, an outer sieving-surface 2 in the form of a frustrum of a cone the imaginary apex of which is directed downward.
- the central sieving-surface 1 overlaps the outermost sieving-surface 2 over a short radial distance.
- the sieving-surface 1 is carried by a spoked-wheel 3 the radially-arranged spokes of which extend from the hub 4 which is in turn a affixed to a mainly vertical central driving-shaft 5.
- the driving shaft 5 is rotatably supported in an inner bearing-assembly 6 which, in its turn, is rotatably supported in an outer bearing-assembly 7 affixed to the frame 8 of the sieving apparatus.
- the driving-shaft 5 can be driven in turn via a gearbox 9 (shown in dotted lines) coupled to the shaft's lower end and which gearbox 9 is coupled again in turn to an electromotor (not shown).
- An alternative driving means for the shaft 5 may be a driving-wheel 10 (shown in fine lines) which is affixed by its own hub 11 to the driving-shaft 5 instead of the gearbox 9.
- the rim 2 of the driving-wheel 11 grips a friction-wheel 13 mounted on a mainly vertical shaft 14 the driving electromotor (not shown) for which is accomodated in the protective casing 15.
- Both the direction-of-rotation (rl) and the angular-velocity (w1) of the driving-shaft 5 can be reversed and infinitely varied respectively by the electromotor used as the driving medium.
- the outermost sieving-surface 2 is supported by a spoked-wheel 16 having a hub 17 which is again affixed to the innermost bearing assembly 6.
- This spoked-wheel 16 has a peripherally-arranged rim 17 which is engaged by an ordinary pneumatic-tire or the like encircling the friction-wheel 18 driven by the mainly vertical shaft which itself is driven in turn by an electromotor 19.
- This electromotor 19 is suspended from a pivotable-arm on a pivot-shat 21 so as to urge the periphery of the friction-wheel 18 into gripping engagement with the rim 17 of the spoked-wheel 16.
- both the direction-of-rotation (r2) and the angular-velocity (w2) of the electromotor 18 can be reversed and infinitely varied respectively by the electromotor 19.
- the sieving-surfaces 1 and 2 are accomodated in a housing 22 having a removable toplid 23 and an a central feedthrough-pipe 24 for the product to be sieved.
- the lower end of the pipe 24 is provided with a tubular-shutter 25 the height of which is vertically-adjustable for the infinitely-variable regulation of the size of the annular discharge-aperture between the non-perforated central portion of the divider 26 of sieving-surface 1 and the lower end of the tubular-shutter 25.
- the tubular-shutter 25 and the divider 26 have been purposefully provided with substantially the same diameters.
- the housing 22 is provided with a centrally-located lower output-pipe 27 for the coarse components of the sieved product just as it is provided with a side outlet 28 for the fine components of the sieved product.
- the mixture of fine and coarse components to be separated is fed into the supply pipe 24 and the tubular-shutter 25 whereafter it flows to the divider 26 and through the annular discharge-aperture between this divider 26 and the mouth of the tubular-shutter 26 and then to the central sieving-surface 1 which is rotating at an angular-velocity (w1) in one direction. Under the influence of centrifugal, gravitational and frictional forces with respect to the sieving-surface, the product moves along approximately involute-flowlines downward to the outer periphery of the sieving-surface 1.
- the product is thrown outward to the inner peripheral surface of the outermost sieving-surface 2 which may for example run at a slower angular-velocity (w2) in a reverse direction-of-rotation so that the product momentarily becomes stationary on impact.
- w2 angular-velocity
- the product then moves in the reverse direction upward toward and over the outer rim of the last quoted sieving-surface 2.
- the fine components are sieved out and discharged through the side outlet 28 whilst the coarse components are discharged via the central outlet 27.
- the invention is not limited to the described and illustrated exemplary embodiments of the invention but extends to all manner of variations thereof.
- more than two radially arranged sieving-surfaces may be provided whilst, in addition hereto, a number of these sieving-surfaces may also be arranged vertically one above another.
Landscapes
- Combined Means For Separation Of Solids (AREA)
- Radar Systems Or Details Thereof (AREA)
- Ultra Sonic Daignosis Equipment (AREA)
Abstract
Description
- The invention relates to a rotatable sieving apparatus in accordance with the preamble to claim 1.
- Apparatus of this type is known from NL-B-179.709 in which a good sieving action is already obtained with a reasonable processing capacity using a single sieving surface. When the capacity is stepped-up too far however, the sieving action decreases commensurately and makes the use of a second underlying sieving-surface necessary in order to maintain the same good sieving action; this means the use of a more complicated, larger and costlier sieving apparatus.
- The object of the invention is to provide a sieving apparatus of the type described in the preamble hereto and in which, in addition to maintaining a good sieving action, the processing capacity can be considerably increased whilst at the same time a less complicated, smaller and cheaper sieving apparatus is obtained than is possible with one in which a number of sieving surfaces lie one above another.
- According to the invention, this object is achieved by taking the measures outlined in the characterising clause to claim 1 and through which the the processing capacity for some products can be increased by 50% whilst still maintaining the same degree of sieving quality.
- Preferred embodiments of the invention are described in the accompanying claims.
- It should be mentioned here that a rotating-surface sieving apparatus is known from DE-B-440.697 AD 1925 and which apparatus incorporates two flat sieving-surfaces one lying above the other and the upper one of which is of circular form and the the lower one of which is of annular form. The product to be sieved is thrown off the circular upper sieving-surface and collides with a cylindrical return-plate encircling the latter and then falls onto the annular lower sieving-surface. The latter is driven at a lower angular-velocity than the upper sieving-surface. Both angular-velocities are constant however and driven from the same central driving shaft. Collision of the sieved product against the cylindrical return-plate has an unfavourable effect on the product. This is particularly so for example when the product is in the form of compressed cattlefeed-pellets which may then be subjected to undesirable breakage or crumbling. Furthermore, the angular-velocities of the sieving portions cannot be adapted to the specific requirements of the particular product being processed so that both the sieving action and processing capacity are limited.
- The invention is now to be described further with reference to the accompanying schematical drawing which shows a vertical cross-section of an exemplary embodiment of a multi-deck sieving apparatus according to the invention. As shown in the drawing, the sieving apparatus comprises a central conically-formed sieving-surface 1, the unperforated apex of the cone of which is directed upward, an outer sieving-
surface 2 in the form of a frustrum of a cone the imaginary apex of which is directed downward. In order to prevent leakage between both sieving portions, the central sieving-surface 1 overlaps the outermost sieving-surface 2 over a short radial distance. The sieving-surface 1 is carried by a spoked-wheel 3 the radially-arranged spokes of which extend from the hub 4 which is in turn a affixed to a mainly vertical central driving-shaft 5. The driving shaft 5 is rotatably supported in an inner bearing-assembly 6 which, in its turn, is rotatably supported in an outer bearing-assembly 7 affixed to the frame 8 of the sieving apparatus. Primarily, the driving-shaft 5 can be driven in turn via a gearbox 9 (shown in dotted lines) coupled to the shaft's lower end and which gearbox 9 is coupled again in turn to an electromotor (not shown). An alternative driving means for the shaft 5 may be a driving-wheel 10 (shown in fine lines) which is affixed by its own hub 11 to the driving-shaft 5 instead of the gearbox 9. Therim 2 of the driving-wheel 11 grips a friction-wheel 13 mounted on a mainlyvertical shaft 14 the driving electromotor (not shown) for which is accomodated in theprotective casing 15. Both the direction-of-rotation (rl) and the angular-velocity (w1) of the driving-shaft 5 can be reversed and infinitely varied respectively by the electromotor used as the driving medium. The outermost sieving-surface 2 is supported by a spoked-wheel 16 having ahub 17 which is again affixed to the innermost bearing assembly 6. This spoked-wheel 16 has a peripherally-arrangedrim 17 which is engaged by an ordinary pneumatic-tire or the like encircling the friction-wheel 18 driven by the mainly vertical shaft which itself is driven in turn by anelectromotor 19. Thiselectromotor 19 is suspended from a pivotable-arm on a pivot-shat 21 so as to urge the periphery of the friction-wheel 18 into gripping engagement with therim 17 of the spoked-wheel 16. Again in this case, both the direction-of-rotation (r2) and the angular-velocity (w2) of theelectromotor 18 can be reversed and infinitely varied respectively by theelectromotor 19. - The sieving-
surfaces 1 and 2 are accomodated in ahousing 22 having aremovable toplid 23 and an a central feedthrough-pipe 24 for the product to be sieved. The lower end of thepipe 24 is provided with a tubular-shutter 25 the height of which is vertically-adjustable for the infinitely-variable regulation of the size of the annular discharge-aperture between the non-perforated central portion of thedivider 26 of sieving-surface 1 and the lower end of the tubular-shutter 25. The tubular-shutter 25 and thedivider 26 have been purposefully provided with substantially the same diameters. Furthermore, thehousing 22 is provided with a centrally-located lower output-pipe 27 for the coarse components of the sieved product just as it is provided with a side outlet 28 for the fine components of the sieved product. - The sieving operation of the apparatus takes place as follows:-
- The mixture of fine and coarse components to be separated is fed into the
supply pipe 24 and the tubular-shutter 25 whereafter it flows to thedivider 26 and through the annular discharge-aperture between thisdivider 26 and the mouth of the tubular-shutter 26 and then to the central sieving-surface 1 which is rotating at an angular-velocity (w1) in one direction. Under the influence of centrifugal, gravitational and frictional forces with respect to the sieving-surface, the product moves along approximately involute-flowlines downward to the outer periphery of the sieving-surface 1. Hereafter the product is thrown outward to the inner peripheral surface of the outermost sieving-surface 2 which may for example run at a slower angular-velocity (w2) in a reverse direction-of-rotation so that the product momentarily becomes stationary on impact. Following this, the product then moves in the reverse direction upward toward and over the outer rim of the last quoted sieving-surface 2. During this displacement over both the sieving-surfaces, the fine components are sieved out and discharged through the side outlet 28 whilst the coarse components are discharged via thecentral outlet 27. - Should the outer sieving-
surface 2 rotate in the same direction as the inner sieving-surface 1, then there will be no reversal of direction of the components but only a retardation of movement in the transition zone between both the sieving-surfaces 1 and 2. - The invention is not limited to the described and illustrated exemplary embodiments of the invention but extends to all manner of variations thereof. Thus more than two radially arranged sieving-surfaces may be provided whilst, in addition hereto, a number of these sieving-surfaces may also be arranged vertically one above another.
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT87202470T ATE79309T1 (en) | 1987-02-07 | 1987-12-09 | ROTARY SCREEN WITH A NUMBER OF SCREEN SURFACES, EACH OF WHICH ARE DIVIDED INTO SEVERAL ROTARY CONCENTRIC RINGS, WHICH ARE REVOLVABLE AND ROTARY WITH CONTINUOUSLY ADJUSTABLE ANGULAR SPEEDS. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL8700290 | 1987-02-07 | ||
NL8700290A NL8700290A (en) | 1987-02-07 | 1987-02-07 | ROTATING SCREENING DEVICE WITH A NUMBER OF SCREEN SURFACES, EACH OF WHICH ARE DIVIDED INTO A NUMBER OF CONCENTRIC RINGS WITH REVERSIBLE, CONTINUOUSLY ANGLE SPEED. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0278124A1 true EP0278124A1 (en) | 1988-08-17 |
EP0278124B1 EP0278124B1 (en) | 1992-08-12 |
Family
ID=19849530
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87202470A Expired - Lifetime EP0278124B1 (en) | 1987-02-07 | 1987-12-09 | A rotating sieving apparatus with a number of sieving surfaces each of which is subdivided into a number of concentric rings with reversible and continuously regulatable angular-velocities |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0278124B1 (en) |
AT (1) | ATE79309T1 (en) |
DE (1) | DE3781137T2 (en) |
ES (1) | ES2033817T3 (en) |
GR (1) | GR3006128T3 (en) |
NL (1) | NL8700290A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0411803A1 (en) * | 1989-08-04 | 1991-02-06 | Ecc International Limited | A rotating screen |
CN102849466A (en) * | 2012-09-03 | 2013-01-02 | 孙家鼎 | Mesh screen cleaning device |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL1003257C2 (en) * | 1996-06-03 | 1997-12-10 | Wijnveen Ede B V | Screening device with a screen position and a short-circuit position. |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE440697C (en) * | 1927-02-12 | Otto Wiencke | Circumferential ring plate sieve | |
GB308530A (en) * | 1928-06-26 | 1929-03-28 | Otto Wiencke | Rotary screening plate |
DE2723242A1 (en) * | 1976-05-24 | 1977-12-15 | Coop Landbouw Aan Verkoop | Fine and coarse ingredient screening unit - has central mixture inlet pipe adjustable for height above distributor cone |
EP0027296B1 (en) * | 1979-10-12 | 1983-07-13 | Coöperatieve Landbouw Aan- en Verkoopcombinatie b.a. "C.L.C." | A sieve device for separating a mixture of particulate material in components of different sizes |
EP0090471A1 (en) * | 1982-03-24 | 1983-10-05 | Coöperatieve Landbouw Aan- en Verkoopcombinatie b.a. "C.L.C." | Pneumatic wheel drive for rotary sieves |
-
1987
- 1987-02-07 NL NL8700290A patent/NL8700290A/en not_active Application Discontinuation
- 1987-12-09 EP EP87202470A patent/EP0278124B1/en not_active Expired - Lifetime
- 1987-12-09 ES ES198787202470T patent/ES2033817T3/en not_active Expired - Lifetime
- 1987-12-09 AT AT87202470T patent/ATE79309T1/en not_active IP Right Cessation
- 1987-12-09 DE DE8787202470T patent/DE3781137T2/en not_active Expired - Fee Related
-
1992
- 1992-11-03 GR GR920402465T patent/GR3006128T3/el unknown
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE440697C (en) * | 1927-02-12 | Otto Wiencke | Circumferential ring plate sieve | |
GB308530A (en) * | 1928-06-26 | 1929-03-28 | Otto Wiencke | Rotary screening plate |
DE2723242A1 (en) * | 1976-05-24 | 1977-12-15 | Coop Landbouw Aan Verkoop | Fine and coarse ingredient screening unit - has central mixture inlet pipe adjustable for height above distributor cone |
EP0027296B1 (en) * | 1979-10-12 | 1983-07-13 | Coöperatieve Landbouw Aan- en Verkoopcombinatie b.a. "C.L.C." | A sieve device for separating a mixture of particulate material in components of different sizes |
EP0090471A1 (en) * | 1982-03-24 | 1983-10-05 | Coöperatieve Landbouw Aan- en Verkoopcombinatie b.a. "C.L.C." | Pneumatic wheel drive for rotary sieves |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0411803A1 (en) * | 1989-08-04 | 1991-02-06 | Ecc International Limited | A rotating screen |
WO1991001815A1 (en) * | 1989-08-04 | 1991-02-21 | Ecc International Limited | A rotating screen |
CN102849466A (en) * | 2012-09-03 | 2013-01-02 | 孙家鼎 | Mesh screen cleaning device |
Also Published As
Publication number | Publication date |
---|---|
ATE79309T1 (en) | 1992-08-15 |
EP0278124B1 (en) | 1992-08-12 |
NL8700290A (en) | 1988-09-01 |
DE3781137D1 (en) | 1992-09-17 |
DE3781137T2 (en) | 1993-01-28 |
ES2033817T3 (en) | 1993-04-01 |
GR3006128T3 (en) | 1993-06-21 |
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