EP0177833A2 - Sécheur à impact - Google Patents

Sécheur à impact Download PDF

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Publication number
EP0177833A2
EP0177833A2 EP85112108A EP85112108A EP0177833A2 EP 0177833 A2 EP0177833 A2 EP 0177833A2 EP 85112108 A EP85112108 A EP 85112108A EP 85112108 A EP85112108 A EP 85112108A EP 0177833 A2 EP0177833 A2 EP 0177833A2
Authority
EP
European Patent Office
Prior art keywords
housing
rotor
impact
outlet opening
flap
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Withdrawn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
EP85112108A
Other languages
German (de)
English (en)
Other versions
EP0177833A3 (fr
Inventor
Rolf König
Heribert Motek
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.)
Salzgitter Maschinenbau GmbH
Original Assignee
Salzgitter Maschinenbau GmbH
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 Salzgitter Maschinenbau GmbH filed Critical Salzgitter Maschinenbau GmbH
Publication of EP0177833A2 publication Critical patent/EP0177833A2/fr
Publication of EP0177833A3 publication Critical patent/EP0177833A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/02—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft
    • B02C13/06—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft with beaters rigidly connected to the rotor
    • B02C13/09—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft with beaters rigidly connected to the rotor and throwing the material against an anvil or impact plate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/26—Details
    • B02C13/288—Ventilating, or influencing air circulation

Definitions

  • the invention relates to an impact dryer with an open rotor which rotates about a horizontal axis and is provided with striking tools, with a housing which has openings above the rotor for the entry of the hot gases, for the entry of the material to be comminuted and dried and for the exit of the hot gases and the comminuted and dried material and which has a closed bottom underneath the rotor and a catch pocket for non-comminutable parts which is connected to the grinding chamber by an outlet opening provided in the housing wall.
  • Impact dryers of this type are known from DE-PS 637 713 and from the advertisement by F.L. Smidth & Co. in the magazine ROCK PRODUCTS, August 1981, page 5. They are generally used to dry materials that have already been pre-shredded or that are naturally, i.e. H. after their extraction, have a grain size suitable for further digestion by impact and impact treatment with simultaneous drying. During this pre-shredding or other pre-treatment, parts that could not be shredded were already largely removed from them, so that these impact dryers do not require any larger facilities for this.
  • hammer or impact mills or impact crushers can be provided in a known manner with simple housing openings provided with the flaps opening under the action of the rotor, through which the non-crushable parts immediately after they enter the mill or the crusher in more or less open pockets, such a design is not possible in the grinding machines used for grinding drying, because hot drying gases are sucked through them, so that a negative pressure prevails in them and openings in the housing allow cold air inflows from the outside, which reduce the hot gas temperature and the pneumatic removal disrupt the good. In addition, much not yet comminuted and dried material would be separated from the material flow, which cannot be easily returned to the impact dryer.
  • the invention has for its object to provide an impact dryer which, despite the negative pressure prevailing in it, can process a regrind which contains to a large extent uncrushable parts and which can separate these parts over long operating times without the regrind being lost and malfunctions of the shredding and drying process due to cold air inflows into the impact dryer.
  • the catcher pocket is compared to the grinding chamber and to the outside air by means of closure flaps Lockable lock chamber is formed and that - as is known in size reduction machines with a grate below the rotor - the end flap or end flaps provided in the housing wall is or can be actuated by a control device which interrupts the supply of material in succession when an unreducible part occurs in the grinding chamber, the flap or opens the flap, closes it again after a short time and starts the material supply again.
  • the control device can be switched on manually by the operating personnel, since the presence of non-crushable parts in an impact dryer is indicated by unmistakable beating noises that drown out the normal operating noises. But this can also be done by an organ that responds to such noises, a so-called electronic ear. Likewise, after a short time or after the noises drowning out the normal operating noises, the control device can be reset by hand or by the organ.
  • the use of such organs to control the supply of regrind in ball mills to achieve the most even and optimal possible regrind filling of the mill is known. There, the grist supply is increased when such noises occur, while it is interrupted in the present case.
  • the outlet opening or openings can be provided at various points on the impact dryer housing.
  • the invention enables an effective operation of the impact dryer with the particularly favorable arrangement of the outlet opening in the bottom region of the housing, it being advantageous if the closure flap can be opened outwards into the lock chamber, so that the unreduced parts from the rotor tangentially out of the housing the lock chamber to be hurled.
  • the closure flap is articulated in a further embodiment of the subject matter of the invention so that it opens into the grinding chamber and is designed such that in the open position it redirects the non-crushable parts thrown up by the rotor into the outlet opening released by the flap, which at a preferred arrangement of the lock chamber below the housing base is connected to the latter by a shaft guided along the outside of the impact dryer housing.
  • a similar arrangement of an end flap for an outlet opening is, however, already known from DE-PS 27 13 177 in an open shredding machine.
  • an impact dryer according to the invention is shown for example in section.
  • a rotor 2 is rotatably arranged about a horizontal shaft 3 in the direction of arrow a.
  • the rotor is provided with blow bars 4.
  • the housing runs concentrically around the rotor in its lower part, so that the blow bars on the lower part of their impact circle move along the housing wall at a short distance and part of the goods discharged through the nozzle 5 via a lock 6 by means of a feed device 7 Move the wall along after it has been thrown by the blow bars against impact walls 8 and crushed in the process.
  • the other part of the material when it is fine and sufficiently dried, is removed by the hot gases directly from the impact zone.
  • hot gases enter the housing 1, and they leave the housing together with the shredded and dried material through the nozzle 10, which is the transition to a subsequent drying tube (not shown) forms.
  • a lock chamber 11 is provided below the impact dryer housing 1 and can be emptied through a flap lock 12.
  • an opening 13 is provided in the housing wall, which is provided with a closure flap 14, which in this way with respect to the impact dryer housing to the outside, i. H. into the lock chamber 11, swings out that uncomminisable parts entering the impact dryer are thrown unhindered into the lock chamber.
  • a further opening 15 is provided in the side wall of the impact dryer housing 1, which opening is also provided with a closure flap 16.
  • This opening is connected to the lock chamber 11 via a shaft 17.
  • the closure flap 16 pivots during the opening movement into the interior of the impact dryer housing 1 and is curved so that it deflects parts thrown upwards by the rotor 2 into the opening 15. You then get through the shaft 17 into the lock chamber 11.
  • a control device which is activated by a hand lever 19. It is designed so that it first stops the feeding device 7, then, if necessary after a short time delay - so that everything contained in the impact dryer housing has left the housing - opens the flaps 14 and 16, so that the unreduced parts that the dryer through the outlet port 10 can not leave through these openings in the lock chamber 11 without cold air can flow into the dryer from the outside. After a short time the shutters are closed again manually or automatically by the control device and then the feed device is put into operation again so that the dryer can continue to work.
  • the control device can also be activated by an organ 20 which reacts to very specific impact noises which occur when parts which cannot be reduced in size have entered the impact dryer.
  • a so-called electronic ear is provided as an organ, which consists of a structure-borne sound microphone as a vibration sensor and an electronic circuit by means of which the background noise is eliminated in terms of circuitry. Noises which drown out the volume and / or have other frequencies are measured and formed into a switching signal which acts on the control device 18. As soon as the non-crushable parts have left the impingement dryer, no more noises are perceived by measuring technology in an adjustable time, the control signal drops again to zero, so that the impingement dryer resumes its work via the control device in the manner described above.
  • control connections of the control device 18 to the feed device 7 and the closure flaps 14 and 16 are symbolized by the dash-dotted lines 21.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Drying Of Solid Materials (AREA)
EP85112108A 1984-10-06 1985-09-24 Sécheur à impact Withdrawn EP0177833A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3436796 1984-10-06
DE19843436796 DE3436796A1 (de) 1984-10-06 1984-10-06 Pralltrockner

Publications (2)

Publication Number Publication Date
EP0177833A2 true EP0177833A2 (fr) 1986-04-16
EP0177833A3 EP0177833A3 (fr) 1986-12-10

Family

ID=6247330

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85112108A Withdrawn EP0177833A3 (fr) 1984-10-06 1985-09-24 Sécheur à impact

Country Status (2)

Country Link
EP (1) EP0177833A3 (fr)
DE (1) DE3436796A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0391096A3 (fr) * 1989-04-07 1991-08-14 NOELL Service und Maschinentechnik GmbH Procédé de réglage automatique de la fente de broyage, déterminant la granulométrie, d'une machine de broyage et dispositif pour la mise en oeuvre du procédé
US5226604A (en) * 1989-04-07 1993-07-13 Salzgitter Maschinenbau Gmbh Method of and apparatus for adjusting comminuting machines

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5535954A (en) * 1994-01-21 1996-07-16 Roskamp Champion Metered lamina air intake for a hammermill feeder

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE637713C (de) * 1936-01-17 1937-06-02 Kohlenscheidungs Ges M B H Schlaegermuehle
DE1182029B (de) * 1960-04-22 1964-11-19 E H Ehrhardt Andreas Dr Ing Vorrichtung zum Feinzerkleinern von Schuettgut und pneumatischem Austrag des zerkleinerten Gutes
DE1166593B (de) * 1960-09-13 1964-03-26 Hazemag Hartzerkleinerung Prallmuehle
FR1330223A (fr) * 1962-05-08 1963-06-21 Fives Lille Cail Dispositif acoustique pour le réglage des broyeurs
FR2340772A1 (fr) * 1976-02-12 1977-09-09 Fives Cail Babcock Perfectionnements aux concasseurs a percussion
DE2713177C2 (de) * 1977-03-25 1989-06-08 Lindemann Maschinenfabrik GmbH, 4000 Düsseldorf Hammerbrecher
DE2741510C2 (de) * 1977-09-15 1988-09-08 Brown, Boveri & Cie Ag, 6800 Mannheim Regeleinrichtung für eine Sichterumlaufmahlanlage

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0391096A3 (fr) * 1989-04-07 1991-08-14 NOELL Service und Maschinentechnik GmbH Procédé de réglage automatique de la fente de broyage, déterminant la granulométrie, d'une machine de broyage et dispositif pour la mise en oeuvre du procédé
US5226604A (en) * 1989-04-07 1993-07-13 Salzgitter Maschinenbau Gmbh Method of and apparatus for adjusting comminuting machines

Also Published As

Publication number Publication date
EP0177833A3 (fr) 1986-12-10
DE3436796A1 (de) 1986-04-10

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