EP0649349B1 - Verfahren und vorrichtung zum sieben eines schüttgutstroms - Google Patents

Verfahren und vorrichtung zum sieben eines schüttgutstroms Download PDF

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Publication number
EP0649349B1
EP0649349B1 EP94916946A EP94916946A EP0649349B1 EP 0649349 B1 EP0649349 B1 EP 0649349B1 EP 94916946 A EP94916946 A EP 94916946A EP 94916946 A EP94916946 A EP 94916946A EP 0649349 B1 EP0649349 B1 EP 0649349B1
Authority
EP
European Patent Office
Prior art keywords
screen
sieve
pct
stream
screen surface
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
EP94916946A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0649349A1 (de
Inventor
Adolf Buchfink
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.)
Claudius Peters AG
Original Assignee
BMH Claudius Peters AG
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 BMH Claudius Peters AG filed Critical BMH Claudius Peters AG
Publication of EP0649349A1 publication Critical patent/EP0649349A1/de
Application granted granted Critical
Publication of EP0649349B1 publication Critical patent/EP0649349B1/de
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
    • B07B4/00—Separating solids from solids by subjecting their mixture to gas currents
    • B07B4/08—Separating solids from solids by subjecting their mixture to gas currents while the mixtures are supported by sieves, screens, or like mechanical elements

Definitions

  • the invention relates to a screening device, in which is a bulk material flow for the most part a screen area should flow through, while only foreign objects such as metal parts or lumps of material are retained. It's up to her based on the task of increasing the required screen area reduce.
  • the solution according to the invention is that the screen surface a ventilation floor in the conveying path of the bulk material flow is connected upstream with approximately the same conveying direction. Thereby the bulk material stream reaches the screen surface as a fluidized bed.
  • the bulk material is in the state of the fluidized bed (at least fine-grained portion) flowable. This makes it easier with the sieving process associated movement processes, namely to the passage of the sieve underflow through the sieve openings and secondly, the separation within the good bed.
  • the Sieving performance per unit area of the sieve surface is thereby enlarged; the required expansion of the screen area is decreased. This also reduces the height requirement.
  • the fluidized bed conveying surface can be a act conventional pneumatic conveyor trough through which porous soil gas into the material bed lying on the conveying surface is initiated, making it flowable is transferred.
  • the conveying movement can by appropriate Slope of the conveying surface must be caused.
  • the fluidized bed cannot be found above the sieve surface sustained in the long term because that is the vortex state justifying gas separating the particles from each other easily can flow up and down. It is therefore advisable that the screen surface in the conveying direction in relation to the conveying speed is so short that the fluidized bed condition of the Sieve overflow remains. More specifically, that should be Bulk goods bed at the end of the sieve conveyor in one condition in which it is still so fluid that it is from the Screen surface can drain off.
  • the other operating conditions to take into account especially slopes and an intended vibration of the screen surface. These influences have a beneficial effect on production and fluidity the estate bed. If there is a slope or vibration, therefore the vortex state at the end of the sieve section does not need to be so pronounced that the good is due to this alone Vortex could still flow away.
  • the length of the screen section is, however there is not a refreshment of the vortex state by gas supply done, set limits. It may therefore be that the Sieve section is shorter than it is to sieve the whole Fine fraction would be required. In this case you can go to the invention several fluidized bed conveying surfaces and sieve surfaces arrange one after the other.
  • the entire screening device provides then as a result of several sections of pneumatic Conveyor troughs alternating with preferably on the same level intermediate sieve sections, the sieve sections are each kept so short that further funding not stopping on it during the pneumatic conveyor trough sections are so long that the required one Fluid bed state can be restored.
  • the flow of the flowable material through the sieve surfaces to accelerate a device for generating a differential pressure promoting the passage of the screen may be provided.
  • the application of a differential pressure on a screen surface is on known (GB-A 671 232).
  • FIG. 1 there is a bulk goods container at the outlet 1 connected to a pneumatic conveyor trough 2.
  • a pneumatic conveyor trough 2 It is a well-known funding element, which as The bottom of a closed conveyor channel is an air-permeable one Has plate, which is from an air supply duct located below is pressurized with compressed air after the Passing the floor penetrates into the bed of material lying on it and placed it in a fluid state as a fluidized bed. Due to the slight gradient, it starts to move.
  • the sieve device 4 To the pneumatic conveyor trough 2 is an elastic Compensator 3, the sieve device generally designated 4 connected, whose underflow by a pneumatic conveyor trough 5 is continued via an elastic compensator 6 is connected to the screening device. The overflow is discharged laterally at 7.
  • the screening device 4 is on Supports 8 arranged by means of vibrating bearings 9 and with unbalance motors 10 equipped, which they according to known principles in Move vibration.
  • FIG. 2 The structure of the screening device is shown in FIG. 2 one recognizes an upper sieve space 11, the bottom of which is flush the compensator 3 to the ventilation floor of the conveyor trough 2 connects. Underneath is a sieve sub-space 12 which as a pneumatic conveyor trough with a ventilation base 13 and a ventilation space 14 for the removal of the screen underflow is executed. At the pneumatic conveyor trough of this sieve sub-area is the pneumatic conveyor trough 5 via the compensator 6 connected in alignment.
  • Ventilation floors 17 which compressed air from a line 18 with suitable actuators forth Ventilation rooms 19 can be supplied.
  • These ventilation floors as well the ventilation floor of the conveyor trough 2 were with the top more general term fluid bed conveying surface.
  • a chute 20 connects to the last screen surface 16, which removes the screen overflow and with flaps 21 is provided to the inflow and outflow of air if necessary prevent.
  • Pendulum flap 22 may be provided.
  • the material bed emerges from the pneumatic conveyor trough 2 in Condition of the fluidized bed in the sieve. Because of their fluidized state, the gradient and the vibration it runs largely over the first screen surface 16. This screen area is shorter than it is for completion the sieving process would be required. About the following Aeration path becomes the fluidization state of the Fluidized bed refreshed again so that it is fluidized Condition reached and overflows the following screen section, and immediately. The screen overflow is through chute 20 at the end discharged from the screening device.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)
  • Automatic Analysis And Handling Materials Therefor (AREA)
EP94916946A 1993-05-10 1994-05-10 Verfahren und vorrichtung zum sieben eines schüttgutstroms Expired - Lifetime EP0649349B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE9307072U DE9307072U1 (de) 1993-05-10 1993-05-10 Vorrichtung zum Sieben eines Schüttgutstroms
DE9307072U 1993-05-10
PCT/EP1994/001504 WO1994026428A1 (de) 1993-05-10 1994-05-10 Verfahren und vorrichtung zum sieben eines schüttgutstroms

Publications (2)

Publication Number Publication Date
EP0649349A1 EP0649349A1 (de) 1995-04-26
EP0649349B1 true EP0649349B1 (de) 1998-04-22

Family

ID=6893088

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94916946A Expired - Lifetime EP0649349B1 (de) 1993-05-10 1994-05-10 Verfahren und vorrichtung zum sieben eines schüttgutstroms

Country Status (7)

Country Link
US (1) US5586660A (ja)
EP (1) EP0649349B1 (ja)
JP (1) JPH07508932A (ja)
AT (1) ATE165258T1 (ja)
DE (2) DE9307072U1 (ja)
ES (1) ES2117274T3 (ja)
WO (1) WO1994026428A1 (ja)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997014513A1 (en) * 1995-10-19 1997-04-24 Ocrim S.P.A. A device and apparatus for classification and separation of particles in cereal milling process
US20050133465A1 (en) * 2002-06-12 2005-06-23 Derrick Corporation Vibratory screen assembly and method of manufacture
US20050082236A1 (en) * 2002-06-12 2005-04-21 Derrick Corporation Vibratory screening machine with suction and method for screening a slurry
US20030230541A1 (en) * 2002-06-12 2003-12-18 Derrick Mitchell J. Vibratory screening machine with suction and pressure and method for screening a slurry
DE102008038645B4 (de) 2008-08-12 2016-06-09 Zeppelin Silos & Systems Gmbh Grobgutseparator zum Trennen von Grobgut aus einem Schüttgut

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2200472A (en) * 1938-06-29 1940-05-14 Schering Corp Granular material separating machine
GB671232A (en) * 1949-07-05 1952-04-30 Joanny Myard Dust collecting plant
FR2087091A5 (ja) * 1970-05-05 1971-12-31 Sosson Guy

Also Published As

Publication number Publication date
WO1994026428A1 (de) 1994-11-24
DE9307072U1 (de) 1994-09-22
US5586660A (en) 1996-12-24
DE59405776D1 (de) 1998-05-28
ES2117274T3 (es) 1998-08-01
JPH07508932A (ja) 1995-10-05
EP0649349A1 (de) 1995-04-26
ATE165258T1 (de) 1998-05-15

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