EP0085458B1 - Sieving device - Google Patents

Sieving device Download PDF

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Publication number
EP0085458B1
EP0085458B1 EP83200109A EP83200109A EP0085458B1 EP 0085458 B1 EP0085458 B1 EP 0085458B1 EP 83200109 A EP83200109 A EP 83200109A EP 83200109 A EP83200109 A EP 83200109A EP 0085458 B1 EP0085458 B1 EP 0085458B1
Authority
EP
European Patent Office
Prior art keywords
sieve surface
sieving device
sieve
rotation
parts
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
EP83200109A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0085458A1 (en
Inventor
Theodorus Jacobus Heesen
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.)
Machinefabriek A Wijnveen BV
Original Assignee
Heesen Theodorus Jacobus
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 Heesen Theodorus Jacobus filed Critical Heesen Theodorus Jacobus
Priority to AT83200109T priority Critical patent/ATE26806T1/de
Publication of EP0085458A1 publication Critical patent/EP0085458A1/en
Application granted granted Critical
Publication of EP0085458B1 publication Critical patent/EP0085458B1/en
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
    • 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
    • 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
    • B07B1/42—Drive mechanisms, regulating or controlling devices, or balancing devices, specially adapted for screens

Definitions

  • the invention relates to a sieving device comprising a rotary pervious sieve surface rotatable about an upwardly extending axis of rotation whereby the sieve surface has a sectional area in a manner such that outer parts of the sieve surface located near the outer periphery are at a higher level than parts of the sieve surface located between said outer parts and said axis of rotation.
  • Such a sieving device is known from NL-A-7605572.
  • the sieve surface forms part of the outer surface of a cone, in which the part nearest the rotary axis is at the lower level and the part of the sieve surface furthest remote from the rotary axis at the higher level.
  • the material to be sieved has to move outwardly along the sieve surface, the fine particles to be separated have to fall down through the sieve surface and the coarse particles have to be ejected from the outer periphery of the sieve surface.
  • the speed of movement of the material to be sieved towards the outer periphery of the sieve is proportionally low near the rotary axis so that comparatively only a small amount of material can be processed per unit time.
  • the speed of rotation of the sieve is raised, the product will pass through the major part of the sieve surface at a distance from the rotary axis with such a velocity that an effective sieving is out of the question.
  • a further disadvantage of this known sieving device is that particles can easily stick in the perforations of the sieve surface from which they can no longer part, since on the contrary due to the effect of the centrifugal force or force of gravity they clamp tight in the perforations.
  • the invention has for its object to provide a sieving device of the kind set forth by which the disadvantages inherent to the known sieving device can be avoided.
  • the sieve surface is curved in a manner that parts of the sieve surface located near the axis of rotation and said outer parts are situated at a higher level than parts of the sieve surface located there between, whereby during rotation of the sieve surface with the normal operational speed the displacement of the material to be sieved by the action of the centrifugal force and the component of the force of gravity extending parallel to the sieve surface takes place with at least substantially constant speed in a radial direction outwards from the middle of the sieve surface.
  • DE-C-71863 there is known a device having a sieve member rotatable about two parallel axes of rotation, however said device has a flat sieve surface extending perpendicular to said axes of rotation.
  • DE-C-862996 shows a sieving device with a curved sieve surface, however said sieve surface is not rotated during use.
  • the sieving device shown in Fig. 1 comprises a circular-section housing 1, the lower part of which is tapering in downward direction.
  • a supporting assembly 2 in the housing 1 is arranged a supporting assembly 2 as well as a stationary, continuous gutter 3. With the gutter communicates the top end of an outlet pipe 4, which extends beyond the housing 1.
  • a housing 5 in which a vertical shaft 6 is journalled with the aid of bearings 7.
  • the lower end of the shaft 6 is provided with a gear wheel 8, which is coupled with the aid of a toothed rope 9 with a toothed wheel 10 fastened to the shaft of a motor 11 supported by the supporting frame 2.
  • the shaft 6 is integral with a shaft 12 extending above the shaft 6, on which shaft 12 a hood 13 is rotatably journalled with the aid of bearings 14.
  • the hood 13 is integral with a toothed wheel 15, which is coupled with the aid of a toothed belt 16 with a toothed wheel 17 fastened to the output shaft of an electric motor 18, which is also secured to the supporting frame 2.
  • a plate 19 forming part of a conical surface and being downwardly and outwardly inclined away from the hood 13.
  • the lower rim of the conical plate 19 is secured by means of a few strips 20 to a continuous sheath 21.
  • a sieve surface 22 Between the top rim of the sheath 21 and the hood 13 is provided a sieve surface 22. From Fig. 1 it will be apparent that this sieve surface is curved so that the rim of this annular sieve surface fastened to the hood 13 and the circumferential rim of this sieve surface 22 fastened to the top rim of the sheath 21 are located at a higher level than the part of the sieve surface in between the former.
  • the housing On the top side the housing has a central inlet port 23 for the introduction of the material to be sieved.
  • Fig. 2 shows that the centre lines of the shafts 6 and 12 may be parallel to one another and be spaced from one another by a distance e.
  • said distance e is, for example, 2 mms.
  • centre lines of the two shafts may be at an angle a to one another, said angle a preferably being 35°.
  • the centre line of the shaft 12 may intersect the centre line of the shaft 6 in the plane in which the two shafts join one another as is shown in Fig. 3 or in this plane the shafts may again be spaced apart by a distance e as shown in Fig. 4.
  • the material moving along the sieve surface After having passed beyond the lowermost point of the sieve surface, designated by A, the material moving along the sieve surface has to move upwards towards the outer rim of the sieve surface. During this upward movement the component of the force of gravity extending parallel to the sieve surface will counteract the centrifugal force. Therefore, by a suitable design of the curved sieve surface 22a most effective displacement of the material along the sieve surface can be ensured, preferably in a manner such that the velocity with which the particles of the material move outwards away from the centre line of the sieve surface remains at least substantially constant, viewed in a horizontal direction.
  • the sieve surface rotates not only about the rotary axis formed by the centre line of the shaft 12, but also the shaft 6 carrying the shaft 12 is rotated with the aid of the electric motor 11.
  • the sieve surface will perform a swinging movement in a horizontal sense, the amplitude of the sieve surface being equal to twice the distance e between the centre lines of the two shafts.
  • the speed of rotation of the shaft 6 appreciably exceeds that of the sieve surface about the shaft 12 so that the sieve surface will perform a strong rocking movement, which will counteract obturation of the pores of the sieve surface.
  • the sieve surface When the shafts are disposed as is shown in Figs. 3 and 4, the sieve surface will, in addition, perform a tilting movement about an imaginary tilting axis at right angles to the centre line of the shaft 6. It will be obvious that as a result the sieve surface will perform upward and downward movements during operation, the deflection of the sieve surface increasing with a growing distance from the rotary axis. This will intensify the sieving effect and contribute to avoidance of clogging of the sieve surface.

Landscapes

  • Combined Means For Separation Of Solids (AREA)
EP83200109A 1982-02-02 1983-01-25 Sieving device Expired EP0085458B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83200109T ATE26806T1 (de) 1982-02-02 1983-01-25 Siebmaschine.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8200375 1982-02-02
NLAANVRAGE8200375,A NL177572C (nl) 1982-02-02 1982-02-02 Zeefinrichting.

Publications (2)

Publication Number Publication Date
EP0085458A1 EP0085458A1 (en) 1983-08-10
EP0085458B1 true EP0085458B1 (en) 1987-04-29

Family

ID=19839176

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83200109A Expired EP0085458B1 (en) 1982-02-02 1983-01-25 Sieving device

Country Status (5)

Country Link
EP (1) EP0085458B1 (enrdf_load_stackoverflow)
JP (1) JPS58133877A (enrdf_load_stackoverflow)
AT (1) ATE26806T1 (enrdf_load_stackoverflow)
DE (1) DE3371180D1 (enrdf_load_stackoverflow)
NL (1) NL177572C (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0356689U (enrdf_load_stackoverflow) * 1989-09-30 1991-05-30
CN110238021A (zh) * 2019-07-08 2019-09-17 浙江理工大学 一种离心式特优名茶分散及除碎机
CN110743775B (zh) * 2019-10-29 2022-11-01 宁波嘉鹏机械设备制造有限公司 一种复合肥造粒烘干装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE71863C (de) * Ph. TAFEL in Augsburg Flachsichter mit im Kreise schwingender und gleichzeitig kreisender Bewegung
DE440697C (de) * 1927-02-12 Otto Wiencke Umlaufendes Ringtellersieb
GB308530A (en) * 1928-06-26 1929-03-28 Otto Wiencke Rotary screening plate
DE862996C (de) * 1950-09-20 1953-01-15 Hans Muellner Einlegerahmen fuer Vieleckplansichter
NL179709C (nl) * 1976-05-24 1989-06-16 Coop Landbouw Aan Verkoop Werkwijze voor het door zeven afscheiden van gruis uit veevoederpersstukjesmateriaal, alsmede een zeefinrichting daarvoor.

Also Published As

Publication number Publication date
EP0085458A1 (en) 1983-08-10
NL177572B (nl) 1985-05-17
NL177572C (nl) 1985-10-16
ATE26806T1 (de) 1987-05-15
DE3371180D1 (en) 1987-06-04
JPH0114828B2 (enrdf_load_stackoverflow) 1989-03-14
JPS58133877A (ja) 1983-08-09
NL8200375A (nl) 1983-09-01

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