EP0353576B1 - Schlagmühle - Google Patents

Schlagmühle Download PDF

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Publication number
EP0353576B1
EP0353576B1 EP89113525A EP89113525A EP0353576B1 EP 0353576 B1 EP0353576 B1 EP 0353576B1 EP 89113525 A EP89113525 A EP 89113525A EP 89113525 A EP89113525 A EP 89113525A EP 0353576 B1 EP0353576 B1 EP 0353576B1
Authority
EP
European Patent Office
Prior art keywords
mill
beater
clearing
beater wheel
beaters
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
EP89113525A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0353576A3 (en
EP0353576A2 (de
Inventor
Edgar Hönges
Thomas Liesemeier
Walter Lohmüller
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.)
Henkel AG and Co KGaA
Original Assignee
Henkel AG and Co KGaA
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 Henkel AG and Co KGaA filed Critical Henkel AG and Co KGaA
Priority to AT89113525T priority Critical patent/ATE86145T1/de
Publication of EP0353576A2 publication Critical patent/EP0353576A2/de
Publication of EP0353576A3 publication Critical patent/EP0353576A3/de
Application granted granted Critical
Publication of EP0353576B1 publication Critical patent/EP0353576B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B02C13/26—Details
    • B02C13/28—Shape or construction of beater elements
    • 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
    • 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
    • B02C13/286—Feeding or discharge
    • 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
    • B02C13/286—Feeding or discharge
    • B02C2013/28618—Feeding means
    • B02C2013/28672—Feed chute arrangements

Definitions

  • the invention is directed to a beater mill with a beater wheel mounted on a horizontal axis in the mill housing, which has a plurality of approximately radially inwardly oriented beaters on the circumference and symmetrically distributed on the periphery some radially outwardly extended beaters which end at a distance in front of the mill housing and with an axial product feed in a mill housing side wall.
  • a tower powder with a wide grain spectrum is produced.
  • the coarse fractions of the tower powder are sieved off as a flap. Since the chemical composition of the coarse fraction corresponds to that of normal powder, it makes sense to adapt the grain spectrum of the coarse fraction to that of the material flow by comminution.
  • This mill which is known as a so-called impact screen mill, consists in itself of a beater wheel with several beaters or baffle plates and a sieve basket surrounding this wheel, the beater wheel and sieve basket being able to rotate in opposite directions during operation.
  • a grinder with a sieve basket and rotating beater wheel is also known from GB-A-2184042.
  • the grinding process of these mills takes place primarily in the area between the grinding track and the peripheral edges of the beater wheel, the grinding track essentially lying just below the inner surface within the sieve basket.
  • the distance between the peripheral club edges and the grinding track should not be less than a certain minimum amount, for example 5 to 15 mm.
  • the peripheral edges of the club must of course not touch the grinding track, because then - due to the increased friction - the club wheel could even be blocked.
  • caking forms preferentially and first. Because of the progressively increasing friction between the grinding track, screen basket and beater wheel, every movement of the screen basket and / or beater wheel is blocked, often after a few hours of operation. In order to increase the service life of the mill when grinding sticky products, one could therefore try to omit the sieve basket completely in order to increase the distance between the periphery of the beater wheel and the grinding track. Corresponding tests carried out by the applicant resulted in a slightly increased service life of the mill, but after three days at the latest the caking on the inner surface of the grinding path of the mill housing had increased to such an extent that the beater wheel blocked and the mill had to be opened for cleaning.
  • the beater wheel of the impact or impact mill is basically equivalent to the rotor of a fan. It therefore conveys large amounts of air.
  • the mill was equipped with a relatively small beater wheel with the housing unchanged. As such, it would have been expected that the service life regarding the gluing and caking of the grinding chamber would be significantly increased until the beater wheel was blocked. In practice, however, the service life was not significantly longer than that of a larger diameter club wheel.
  • a mill of the type described at the outset, which is already designed without a screen basket, is known from CH-A-568794.
  • This mill is a shot blower in which at least two impact wheels arranged inside one another, preferably rotating in opposite directions, are mounted on a horizontal axis within a housing.
  • this blower is also intended to be used for transporting or conveying the goods.
  • Another mill is known from DE-C-739463.
  • L-shaped profile irons are applied to a beater wheel.
  • This mill has a product feed entering the mill housing radially vertically from above.
  • the object of the invention is to provide a solution which enables the rollover in the mill which arises during the spray-drying process of detergent powder during the screening and which has a strong tendency to cake and stick to be milled without disruption over an operating time of at least about one month.
  • this object is achieved according to the invention in that the removal beaters are toothed on their peripheral edge, the teeth of the teeth being offset from one another in such a way that, with two diametrically opposed removal beaters, each tooth of the one removal beater into one The other clearing club's gap falls.
  • the inventive design of the removal beater forms the grinding path provided on the inner circumference of the mill housing and at the same time keeps the grinding space clear between the circumference of the beater wheel and the grinding path.
  • the grinding chamber is kept particularly effective with regard to the power required for the scraper by virtue of the fact that the scraper beaters are toothed on their peripheral edge and the teeth of the toothing of the scraper beaters are offset from one another. With two diametrically opposed removal beaters, each tooth of one removal beater falls into a gap in the other removal beater, so that the effort required to keep the grinding chamber free is particularly low and Blockages cannot occur.
  • the beater wheel itself forms its grinding path with the help of the removal beater and thereby keeps a defined area in the grinding chamber clear.
  • the grinding chamber is prevented from overgrowing and the beater wheel is consequently blocked.
  • Balancing the club wheel is not necessary with diametrically opposed removal clubs.
  • Two or more removal clubs can be arranged symmetrically around the circumference of the racket wheel.
  • a cone integrated in a mill door is provided as the product feed to the beater wheel.
  • the cone that opens in the direction of the beater wheel should be slightly smaller on the side facing the beater wheel than the diameter of the beater wheel in order to avoid that from the grinding chamber provided on the periphery of the beater wheel, already ground product, which is still prone to baking the insertion cone is pushed back. For the same reason, the distance between Cone and club wheel are kept as low as possible without mutual friction.
  • Equipping the beater wheel with a plurality of radially projecting removal beaters is advantageous regardless of the difference in diameter between the beater wheel and the inner circumference of the mill housing. Even if, for example to reduce the amount of air conveyed by the mill, a relatively small beater wheel is provided, it is essential for an economically satisfactory service life to equip this beater wheel with removal beaters according to the invention which project in the radial direction. These keep the grinding track assigned to the beater wheel, which forms itself on the product baking on the inner circumference of the mill housing, and the grinding chamber permanently free. After a relatively short operating time, such a mill operates as if the diameter of the mill housing was reduced. The dimensions of the product feed must be adapted to the reduced beater wheel.
  • the coarse fractions of freshly dried washing powder which tend to stick and bake, can be ground without problems without clogging the inlet and outlet and without blocking the beater wheel.
  • Such a mill is also suitable for grinding less sticky products, but its particular advantage is particularly evident when processing products that tend to bake and stick.
  • the impact mill is arranged in a detergent preparation process following a detergent spray drying and is supplied with a coarse fraction of the coarse fraction of the tower starting powder.
  • the beater wheel 3 has a plurality of beaters 4 which describe the circumference 6 of the beater wheel 3 defined during rotation with its peripheral edge.
  • two beaters in the function as clearing beater 9 are enlarged in the radial direction to such an extent that they reach the (provided) grinding track 1. If the grinding track 1 is therefore not formed directly by the material of the mill housing but by caking product, the peripheral edges 10 of the removal beaters 9 determine the grinding track 1.
  • the mill has a mill housing 11, within which a beater wheel 3 is rotatably mounted about an axis 2.
  • the beater wheel 3 is driven from outside via a shaft 12. It has a large number of clubs 4 and diametrically two clearing beaters 9 projecting over its circumference 6, which keep or define the grinding chamber 8 and thus the grinding track 1.
  • the removal racket 9 provided in the exemplary embodiment has a toothing 13 according to FIG. 2, the teeth 14 and gaps 15 of which are offset from one another such that a tooth 14 and a gap 15 always meet in the circumferential direction.
  • the section of FIG. 2 also shows a product feed, designated overall by 16, which is integrated in a mill door 17 and is designed as a cone 18 which is open towards the beater wheel 3.
  • the outer diameter d of the cone 18 on its side facing the beater wheel 3 should be slightly smaller than the diameter D of the beater wheel 3.
  • the distance a between the cone 18 and beater wheel 3 is kept as small as possible.
  • the choice of the relative sizes d / D and the smallest possible distance a prevent fresh material from the grinding chamber 8, which is still prone to caking, from being pressed back into the product feed 16 and from clogging the feed.
  • the regrind should normally be discharged in the radial direction, for example — as shown in FIG. 2 — through an outlet 19 provided on the underside in the direction of the arrow.
  • Fig. 4. shows an example of an application of the impact mill according to Fig. 1 to 3.
  • a tower powder with a broad grain spectrum and mixed with agglomerates, fragments and wall deposits is produced in the discharge of the dryer.
  • the coarse fractions of the tower powder are sieved off as a flap.
  • You get, for example, from the screen 20 5th G (G upper floor) of a drying tower into one Mill 21 according to the invention, which can be located, for example, in the 4th G of the drying tower.
  • the outlet of the mill 21 can be connected in the 3rd G to a line 23 which leads the ground product back to the tower discharge belt 25 located in the 2nd G of the drying tower.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Crushing And Grinding (AREA)
  • Graft Or Block Polymers (AREA)
  • Developing Agents For Electrophotography (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Food-Manufacturing Devices (AREA)
  • Forklifts And Lifting Vehicles (AREA)
EP89113525A 1988-07-30 1989-07-22 Schlagmühle Expired - Lifetime EP0353576B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89113525T ATE86145T1 (de) 1988-07-30 1989-07-22 Schlagmuehle.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3826039 1988-07-30
DE3826039A DE3826039A1 (de) 1988-07-30 1988-07-30 Schlagmuehle

Publications (3)

Publication Number Publication Date
EP0353576A2 EP0353576A2 (de) 1990-02-07
EP0353576A3 EP0353576A3 (en) 1990-10-10
EP0353576B1 true EP0353576B1 (de) 1993-03-03

Family

ID=6359975

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89113525A Expired - Lifetime EP0353576B1 (de) 1988-07-30 1989-07-22 Schlagmühle

Country Status (6)

Country Link
EP (1) EP0353576B1 (tr)
AT (1) ATE86145T1 (tr)
DE (2) DE3826039A1 (tr)
DK (1) DK367089A (tr)
ES (1) ES2040939T3 (tr)
TR (1) TR24776A (tr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4115496A1 (de) * 1991-05-11 1992-11-12 Loedige Maschbau Gmbh Geb Mischwerkzeug
ITSA910007A1 (it) * 1991-08-13 1993-02-15 Paolini M Ilid Sas Sistema per la lavorazione di materiali inerti per produzione di sabbie applicabili a rotori di mulini a martelli o ad urto
DE4223872A1 (de) * 1992-07-20 1994-01-27 Henkel Kgaa Verfahren zum Zerkleinern weicher bis mittelharter Stoffe sowie eine dazu geeignete Prallmühle
DE4439449A1 (de) * 1994-11-04 1996-05-09 Henkel Kgaa Schlagmühle für klebrige Produkte
AU703411B2 (en) * 1995-01-06 1999-03-25 Svedala New Zealand Limited Improved rotor design

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH568794A5 (tr) * 1973-08-14 1975-11-14 Aebi & Co Ag

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE739463C (de) * 1942-01-16 1943-09-27 Johann Kassmann Schlaeger fuer Schlagleistenmuehlen
GB754659A (en) * 1953-08-27 1956-08-08 Ludwig Pallmann Centrifugal mill
US2999652A (en) * 1959-07-27 1961-09-12 Ervin J Dear Ore pulverizing mill with centrifugal impact pulverizing action
US4093127A (en) * 1975-10-21 1978-06-06 Life Resources Incorporated Disintegrator and separator apparatus
US4635863A (en) * 1984-07-09 1987-01-13 Aggregates Equipment, Inc. Reversible, axially fed, cage rotor impact breaker
GB2184042A (en) * 1985-12-13 1987-06-17 Peabody Holmes Ltd Mineral crushing equipment

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH568794A5 (tr) * 1973-08-14 1975-11-14 Aebi & Co Ag

Also Published As

Publication number Publication date
TR24776A (tr) 1992-03-09
DE3826039A1 (de) 1990-02-01
DK367089D0 (da) 1989-07-25
ATE86145T1 (de) 1993-03-15
ES2040939T3 (es) 1993-11-01
DE3826039C2 (tr) 1990-11-22
EP0353576A3 (en) 1990-10-10
DK367089A (da) 1990-01-31
EP0353576A2 (de) 1990-02-07
DE58903639D1 (de) 1993-04-08

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