EP0385241A1 - Siebmaschine - Google Patents

Siebmaschine Download PDF

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Publication number
EP0385241A1
EP0385241A1 EP90103291A EP90103291A EP0385241A1 EP 0385241 A1 EP0385241 A1 EP 0385241A1 EP 90103291 A EP90103291 A EP 90103291A EP 90103291 A EP90103291 A EP 90103291A EP 0385241 A1 EP0385241 A1 EP 0385241A1
Authority
EP
European Patent Office
Prior art keywords
drum
screening machine
machine according
screening
horizontal axis
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Withdrawn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
EP90103291A
Other languages
German (de)
English (en)
French (fr)
Inventor
Lothar Dipl.-Ing. Schiller
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0385241A1 publication Critical patent/EP0385241A1/de
Withdrawn legal-status Critical Current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
    • B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
    • B07B13/14—Details or accessories
    • B07B13/16—Feed or discharge arrangements
    • 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
    • B07B1/18—Drum 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
    • B07B1/18—Drum screens
    • B07B1/22—Revolving drums

Definitions

  • the invention relates to a screening machine with a drum structure rotating about an essentially horizontal axis and covered with a screen fabric on the outside.
  • the invention has for its object to provide a compact screening machine suitable for difficult to sieve material, the operation of which is not impaired by the formation of pinching grains.
  • the invention is based on the idea of not allowing the number of grain layers to exceed a maximum permissible maximum value during the entire sieving process, and thus of making the sieve surface load predictable.
  • the solution is that a screening machine of the type mentioned at the outset evenly distributed openings over the drum structure, which form clamps for the screenings in connection with the stretched screen fabric, a screenings feed extending below the horizontal axis inside the drum and one above the horizontal Has axis in the drum inner longitudinally extending discharge.
  • the chambers make it possible that during the entire sieving process, after the material to be sieved has been fed in over the entire length of the drum sieve, no additional material to be sieved can get into the area of the individual sieve surface sections, so that the sieve surface load cannot rise above a maximum value which depends on the feed quantity . This prevents the formation of pinching grains and also achieves a high degree of selectivity.
  • the transport function of the chambers prevents uncontrolled swirling of the material to be screened, which adversely affects the selectivity.
  • the chambers prevent slippage when the drum is in operation number slightly less than 1 the heavier particles are not conveyed to the discharge.
  • the material to be sieved which extends in the longitudinal direction below the horizontal axis, enables the material to be sieved to be fed into the individual chambers simultaneously over the entire length of the sieve.
  • the discharge arranged in the longitudinal direction above the horizontal axis takes up the entire length of the oversize grain that is detached from the screen lining as a result of the increasing force of gravity as the distance from the horizontal plane through the horizontal axis increases, and leads it out of the drum. Due to the arrangement of the task and discharge according to the invention, it is possible to use circular segments of the drum screen over their entire length only for the screening or only the discharge of the oversize grain. This results in a particularly efficient use of the available screen area, which accommodates the compact design of the screening machine.
  • a zigzag-shaped overflow edge on a feed chute bundles the feed jet, so that in particular moist screenings or suspensions can be poured into the chambers in a more targeted manner.
  • a sieving aid supports the sieving process in the individual chambers, so that the selectivity increases.
  • a nozzle plate which extends over a pitch arc at a short distance from the drum stand can be considered for blowing a fluid, for example air, radially outward.
  • a small distance between the nozzle plate and the drum frame prevents the grains contained in the individual chambers from escaping and mixing due to the fluid flowing through the chambers.
  • the choice of fluid depends on the material to be screened. Air is suitable for dry screenings that do not react with air. If an air reaction of the dry screenings is to be expected, an inert gas should preferably be used for rinsing. In the case of suspensions and moist screenings, rinsing liquids can also be used. Collection chambers connected to supply lines on the inside of the nozzle plate allow all the nozzles to be easily supplied with the fluid via an axially guided main line through which the individual supply lines converge.
  • a task that opens into the gap between the nozzle plate and the drum frame prevents turbulence of the feed material when it is filled into the chambers.
  • the drum stand can optionally be provided with circular or rectangular openings, with circular openings being preferred for very fine feed material.
  • Each opening preferably has a radially outer section with a constant opening cross section and a funnel-shaped section which widens radially inwards.
  • a spray nozzle system which is essentially opposite the discharge trough can be arranged outside the sieve drum. Since this spray nozzle system can be subjected to a considerably higher pressure than the nozzle system that acts as a sieve aid, the Ablei is oversize is possible even with spinning digits greater than 1. In addition, even the most stubborn grit can be removed from the mesh with a correspondingly high pressure and conveyed out of the drum via the discharge trough.
  • the product supply and removal can be accomplished with only one conveyor belt, which runs through the drum approximately in the area of the horizontal axis and has a scraper guiding the screened material onto a vibrating chute.
  • the vibrating chute releases the screenings.
  • the oversize remaining on the screen fabric slides back over an opening of the discharge according to the invention behind the scraper onto the conveyor belt.
  • the sieving machine essentially consists of a cylindrical sieve drum 1 rotating about a horizontal axis, of a drum frame 2 which is covered on the outside with a fine-mesh sieve fabric 3, preferably with a mesh size of 0.1 mm.
  • the drum frame 2 has openings 4, 5 which are evenly distributed over its outer surface and which, in conjunction with the stretched-out sieve fabric, form 3 chambers for the sieved material.
  • the drum frame 2 has circular openings 4, 5.
  • Each opening 4, 5 has a radially outer section 4 with a constant opening cross section and a radially inner section 5 which widens inwardly in a funnel shape.
  • the webs 13 between adjacent openings 4, 5 or rows of openings a small width of about 4 mm on the inside of the drum.
  • Is within the screening drum 1 is stationary, is disposed over a portion of arc of about 240 o extending nozzle plate 6, which begins at an angular distance of approximately 60 o in front of the lowest point of the screen drum. 1
  • the gap between the nozzle plate 6 and the drum frame 2 is approximately 2 mm.
  • Openings 8 of the nozzle plate 6 serve to blow air radially outward in order to support the sieving process in the chambers 4, 5.
  • the discharge trough 11 is located outside the sieve drum 1, a line and spray nozzle system 12 to blow out grit, which nevertheless settles occasionally in the fine-meshed screen fabric, and to support the detachment of the coarse material from the screen fabric.
  • the principle of air jet sieving leads to an outlet velocity through the screen fabric that is slowed down compared to the air inlet speed through the openings 8.
  • the slowed-down air flow gently mixes the material to be sieved on the sieve fabric 3, thereby avoiding jammed grain.
  • a conveyor belt 21 runs through the screening machine according to FIG. 4 with a scraper 22 for the feed material arranged approximately in the region of the center of the longitudinal axis of the drum 1 above the conveyor belt 21.
  • a vibrating chute 23 for feeding the material to be screened is installed below the conveyor belt 21.
  • the discharge trough 24 has an opening 25 behind the stripper 22, via which the separated oversize particles are returned to the conveyor belt 21.
  • a sieving machine additionally equipped according to FIG. 4 allows both the material to be sieved with only one conveyor system transport as well as oversize removal. The arrangement according to FIGS. 4 and 5 is less suitable for the fine material classification, since the finest particles would be removed from the conveyor belt 21 under the stripper 22.
  • a spray nozzle system 12 can usually be dispensed with entirely because of the lower, effective adhesive forces, since the particles separate themselves from the screen mesh 3 due to the gravitational component of the individual particles increasing to the highest point of the screen drum 1 and fall into the discharge trough 24 if the number of spins of drum 1 is not greater than 1; Accordingly, FIG. 5 shows spray nozzles 12, on the one hand to ensure that the oversize is reliably discharged even in the case of fluctuating drum speeds and the associated changes in the number of centrifuges, and on the other hand in the case of occasional clamping grain formations.

Landscapes

  • Combined Means For Separation Of Solids (AREA)
EP90103291A 1989-02-25 1990-02-21 Siebmaschine Withdrawn EP0385241A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19893905945 DE3905945A1 (de) 1989-02-25 1989-02-25 Siebmaschine mit einer um eine im wesentlichen horizontale achse rotierenden, zylindrischen siebtrommel
DE3905945 1989-02-25

Publications (1)

Publication Number Publication Date
EP0385241A1 true EP0385241A1 (de) 1990-09-05

Family

ID=6374954

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90103291A Withdrawn EP0385241A1 (de) 1989-02-25 1990-02-21 Siebmaschine

Country Status (3)

Country Link
EP (1) EP0385241A1 (enrdf_load_stackoverflow)
CA (1) CA2010897A1 (enrdf_load_stackoverflow)
DE (1) DE3905945A1 (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0801995A1 (de) * 1996-04-12 1997-10-22 Umwelt-Technics-Nord GmbH Anlage zur Absiebung einer Fraktion kleiner Korngrössen aus einem zerkleinerten Gut
CN110002244A (zh) * 2019-04-22 2019-07-12 芜湖中能机械制造有限公司 碗型塞尺寸自动检测装置
CN110387763A (zh) * 2019-08-05 2019-10-29 山东晨钟机械股份有限公司 一种制浆行业用倾斜式圆筒筛选机

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19509796C1 (de) * 1995-03-17 1996-05-09 Umwelt Technics Nord Gmbh Anlage zur Absiebung einer Fraktion kleiner Korngrößen aus einem zerkleinerten Gut
AT404436B (de) * 1997-02-19 1998-11-25 Riedl Helmut Siebvorrichtung
NL2014210B1 (nl) * 2015-01-29 2017-01-27 Oijense Bovendijk B V Zeefinrichting en werkwijze voor het scheiden van droog korrelvormig materiaal.
CN118060053B (zh) * 2024-04-18 2024-06-21 太原科技大学 一种适用于细粒煤的复合干法选煤系统

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191409986A (en) * 1913-05-01 1914-09-17 Herbert Ashton Megraw Improvements in and relating to Screening Apparatus for Ores and the like.
US2093446A (en) * 1934-08-21 1937-09-21 Pangborn Corp Abrasive separating and cleaning apparatus

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3135294A1 (de) * 1980-05-29 1983-03-24 Hannes-Jürgen 3000 Hannover Kapuschinski Siebvorrichtung

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191409986A (en) * 1913-05-01 1914-09-17 Herbert Ashton Megraw Improvements in and relating to Screening Apparatus for Ores and the like.
US2093446A (en) * 1934-08-21 1937-09-21 Pangborn Corp Abrasive separating and cleaning apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0801995A1 (de) * 1996-04-12 1997-10-22 Umwelt-Technics-Nord GmbH Anlage zur Absiebung einer Fraktion kleiner Korngrössen aus einem zerkleinerten Gut
CN110002244A (zh) * 2019-04-22 2019-07-12 芜湖中能机械制造有限公司 碗型塞尺寸自动检测装置
CN110002244B (zh) * 2019-04-22 2024-04-19 芜湖中能汽车零部件制造有限公司 碗型塞尺寸自动检测装置
CN110387763A (zh) * 2019-08-05 2019-10-29 山东晨钟机械股份有限公司 一种制浆行业用倾斜式圆筒筛选机

Also Published As

Publication number Publication date
DE3905945A1 (de) 1990-08-30
DE3905945C2 (enrdf_load_stackoverflow) 1991-04-25
CA2010897A1 (en) 1990-08-25

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