EP0764470A1 - Procédé pour mouture à percussion et broyeur à choc - Google Patents

Procédé pour mouture à percussion et broyeur à choc Download PDF

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Publication number
EP0764470A1
EP0764470A1 EP96112075A EP96112075A EP0764470A1 EP 0764470 A1 EP0764470 A1 EP 0764470A1 EP 96112075 A EP96112075 A EP 96112075A EP 96112075 A EP96112075 A EP 96112075A EP 0764470 A1 EP0764470 A1 EP 0764470A1
Authority
EP
European Patent Office
Prior art keywords
sieve
impact
blades
impact mill
rotor
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.)
Granted
Application number
EP96112075A
Other languages
German (de)
English (en)
Other versions
EP0764470B1 (fr
Inventor
Guido Krämer
Eugen Chrapatsch
Volodia Chrapatsch
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.)
Buehler AG
Original Assignee
Buehler 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 Buehler AG filed Critical Buehler AG
Publication of EP0764470A1 publication Critical patent/EP0764470A1/fr
Application granted granted Critical
Publication of EP0764470B1 publication Critical patent/EP0764470B1/fr
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
    • B02C13/20—Disintegrating by mills having rotary beater elements ; Hammer mills with two or more co-operating rotors
    • 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
    • B02C13/20—Disintegrating by mills having rotary beater elements ; Hammer mills with two or more co-operating rotors
    • B02C13/205—Disintegrating by mills having rotary beater elements ; Hammer mills with two or more co-operating rotors arranged concentrically
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B02C23/10—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone
    • B02C23/12—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B02C23/16—Separating or sorting of material, associated with crushing or disintegrating with separator defining termination of crushing or disintegrating zone, e.g. screen denying egress of oversize material

Definitions

  • the invention relates to a method for impact milling, in particular of granular ground material such as grain or cubes, according to the preamble of claim 1, and an impact mill with coaxial rotating rotors driven rotors according to the preamble of claim 4.
  • It is particularly used for grinding regrind for animal feed.
  • centrifugal channels have also been proposed (see DE-PS-699100 and DE-A-3708914) in order to use the energy imparted to the regrind particles to convey them out of the impact area onto a subsequent sieve. Even with such tangential centrifugal channels, the ground material is thrown onto the sieve.
  • impact mills have a fixed housing with a rotor arranged and driven therein. It is also known to design disintegrators for very fine comminution with two coaxial rotors driven in opposite directions (DE-A-3417556).
  • the rotors each carry at least two concentric blade rings, the blade rings of both rotors alternately intermeshing. Both rotors are driven by a common drive.
  • one rotor is fastened to a hollow shaft and the other rotor is arranged on a shaft which penetrates the hollow shaft via a bushing. Both shafts are stored in an external bearing.
  • the high design effort is necessary to achieve a turbo effect in accordance with EP-A-48012 with a safe bearing function.
  • the invention has for its object to provide a method for impact grinding of granular regrind and an impact mill for carrying out the method, which enables a high uniformity of the grinding of the regrind (low scattering of the particle size) with a minimal content of dust fractions with little technical and economic effort . This is done in a surprisingly simple way by the features of the characterizing part of the claim.
  • the regrind is passed to a first grinding stage, where it is accelerated in a defined direction and strikes a surface of work organs. Under the action of impact, the regrind grains are comminuted into particles of different sizes by transmitting the speed vector opposite to the acceleration. The shredded particles then go to a separator, where they are separated accordingly. The separator is located outside the crushing zone and the particles approach each other tangentially. The particles of the desired size are discharged as a finished product, and coarse particles are returned to the comminution zone in a second comminution stage, where they are subjected to an acceleration and impact again, however, in contrast to the first stage, finer particles are formed. There is again a separation into coarse and finished product outside the comminution zone, the coarse product again being fed to the first comminution stage.
  • a sieve is additionally arranged outside the grinding chamber in order to ultimately increase the sieve area.
  • a centrifugal channel according to DE-A-37 08 914 without a sieve in the channel cannot provide any justified suggestion for this. It is necessary to relocate the additional screen surface mentioned in the curved area of the channel. This enables the fine product to be screened almost completely when the required granulation is reached, which also significantly reduces the power requirement compared to comparison solutions.
  • the channels abut each other at the outlet of the cylindrical chamber and form the common channel, which merges into two separate crossed channels, which are connected to the work areas, in the direction of product travel.
  • the sieve is mounted in the curved part of the channel in such a way that a space is formed behind the sieve, which is connected to the space of the cylindrical chamber behind the sieve by a pipeline.
  • the crushing cycle is closed and the particles are separated outside of that, which allows both a reduction in energy consumption and wear of the separating device.
  • differentiated treatment of particles of different sizes is achieved.
  • the use of two comminution stages allows the influence on particles with different processing intensities in each stage.
  • the process can be carried out in an impact or impact mill with a cylindrical chamber, which has inlet and outlet connections for the regrind as well as rotors which are coaxially installed therein and which rotate in the opposite direction with the working elements attached to them.
  • the chamber is perforated and divided into two chamber regions by means of the rotors, the regions crossing one another Channels are connected, which are arranged outside their limits and which result in a closed flow of the regrind.
  • the result is a closed grinding process with a predeterminable particle size and the possibility of automatic control of the process.
  • An impact mill is fed with the material to be ground. This passes through an inlet 2 in free fall into a first working area 12 of a chamber 4.
  • the regrind is passed onto a first row of blades 7 of the rotor 6 under the action of an air flow generated by a rotary movement of a rotor 6.
  • the individual grains of the ground material are gripped by these blades 7, accelerated and thrown against blades 9 of a rotor 8 at high speed.
  • the blades 9 are located between the first and a second row of blades 7 of the rotor 6.
  • the number of transfer stages of the coarse fractions from the work area 12 into the work area 13 depends on the type of the ground material, its moisture and the intensity of the impact.
  • rotors 6 and 8 with blades 7 and 9 attached to them are arranged horizontally and coaxially.
  • the rotors 6, 8 are surrounded on their outer circumference by a sieve 5, as a result of which a cylindrical chamber 4, which is divided into two working areas 12 and 13 by the rotors 6, 8.
  • the rotors 6, 8 are driven by electric motors 10 and 11.
  • the rotor 6 has two rows and the rotor 8 has a row of blades 7, 9, which is divided into two halves with the rotor disk. One half of the blades 9 of the rotor 8 is arranged between the rows of blades of the rotor 6.
  • An inlet 2 which is arranged on the side of the working area 12 on the housing 1, serves to feed the impact mill with regrind.
  • An outlet 3 for the ground material (finished product) is arranged below the chamber 4.
  • channels 14 and 15 are arranged on the housing 1 for returning the insufficiently comminuted (coarse) particle fractions.
  • the channels 14, 15 are arranged outside the chamber 4.
  • the width of the channel 14 corresponds to the width of the row of blades 7 of the rotor 6, which is arranged closer to the axis 16.
  • the channel 14 has a curved, curved shape, starting from the chamber 4 and opening laterally and centrally into the working area 13.
  • Channel 15 is designed analogously. It also starts from chamber 4 and opens laterally and centrally into work area 12.
  • the size of the gap between the ends of the blades 7 and the sieve 5 is to be dimensioned such that the movement of the comminuted product on the sieve 5 takes place under the action of the centrifugal force without the direct action of the outer blades 7.
  • the angle of attack of the blades 7, 9 should be chosen to be correspondingly small in order to achieve the described wear-reducing movement path of the particles.
  • the electric motors 10, 11 are loaded approximately the same.
  • the perforated part of the chamber 4 can be dismantled in order to allow a screen change.
  • the perforated part of the chamber 4 should also take up as large a part of its cylindrical surface as possible in order to achieve an efficient separation process.
  • the number of grinding stages can be increased, e.g. B. on seven stages, the rotor 6 then having three and the rotor 8 two rows of blades 7, 9.
  • a further sieve 17 which is attached outside the cylindrical chamber 4.
  • the channels lie against one another at the outlet of the cylindrical chamber and form the common channel, which merges into two separate crossed channels 14 and 15 in the direction of product travel, which channels are connected to the working areas 13 and 12.
  • the sieve 17 is mounted in the curved part of the channel 23 in such a way that a space 18 is formed behind the sieve, which is connected to the space 19 of the cylindrical chamber 4 behind the sieve by a pipeline 20.
  • the device with the sieve 17 works as follows:
  • the fraction of desired fineness is withdrawn from the device as a finished product through the outlet 3, the coarse fraction which does not pass through the opening of the sieve 5 has passed through channel 23 to sieve 17.
  • the crushed material is subjected to a further separation according to fractions on the sieve 17.
  • the passage through the sieve 17 reaches the space 18 located behind the sieve, from where it is directed into the space 19 of the cylindrical 4 located behind the sieve.
  • the product from the space behind the sieve is discharged as a finished product through outlet 3.
  • the fraction which has not passed through the openings of the sieve 17 passes through the channel 14 for further grinding.
  • the finished product passes through the sieve 5, the insufficiently comminuted product portion is directed as a repulsion via the duct 15 from the sieve 17 into the work area 12 for further grinding.
  • the performance of the device can also be increased by using a shield 21 which is attached to the outlet of the cylindrical chamber 4, between the large rotor and the screen 5.
  • the shield 21 can consist of one piece or can be equipped with a blind 22.
  • the shield 21 can be used to direct the product fraction, which has had insufficient contact with the surface of the sieve, onto the sieve 5 for further separation.
  • the shield 21 helps to generate the necessary pressure of the air flow on the sieve 5, thereby increasing the intensity of the passage of the particles through the openings in the sieve.
  • the blind 22 in turn helps to increase the blowing intensity of the sieve 17.
  • inventive Principle in a further embodiment also open arrangements of the opposing rotors.
  • the rotors are arranged side by side in one plane (FIGS. 8, 9).
  • the product reaches the rotor 24 via an inlet 2 ', is accelerated and comminuted and reaches the working space of the counter-rotating rotor 26 via the channel 25, with a renewed acceleration and second comminution taking place.
  • the comminuted product is then discharged from the grinding chamber via the channel 27 and separated (not shown).
  • the product after the first comminution in the grinding chamber of the rotor 24, the product reaches the grinding chamber of the rotors 26, 28 running in the same direction via the channel 25, 25 'and is comminuted again.
  • the comminuted product via the channels 27, 27 'into a common, not explicitly shown channel again for separation.
  • the impact mill When grinding grain into flour, the impact mill can be used as a B1 and B2 passage.
  • the impact mill according to the invention is not limited to these embodiments.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Crushing And Grinding (AREA)
EP96112075A 1995-09-25 1996-07-26 Procédé pour mouture à percussion et broyeur à choc Expired - Lifetime EP0764470B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH02698/95A CH690709A5 (de) 1995-09-25 1995-09-25 Verfahren zur Prallvermahlung und Prallmühle.
CH2698/95 1995-09-25
CH269895 1995-09-25

Publications (2)

Publication Number Publication Date
EP0764470A1 true EP0764470A1 (fr) 1997-03-26
EP0764470B1 EP0764470B1 (fr) 2000-07-05

Family

ID=4239581

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96112075A Expired - Lifetime EP0764470B1 (fr) 1995-09-25 1996-07-26 Procédé pour mouture à percussion et broyeur à choc

Country Status (6)

Country Link
EP (1) EP0764470B1 (fr)
CH (1) CH690709A5 (fr)
DE (1) DE59605539D1 (fr)
ES (1) ES2148640T3 (fr)
RU (1) RU2176933C2 (fr)
UA (1) UA46733C2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014127408A1 (fr) 2013-02-19 2014-08-28 Grains Research & Development Corporation Dispositif de dévitalisation de graines de mauvaises herbes
CN114849882A (zh) * 2022-07-11 2022-08-05 陶瓷工业设计研究院(福建)有限公司 一种对撞式节能环保型陶瓷用的智能粉碎加工装置

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2714771C1 (ru) * 2019-10-14 2020-02-19 федеральное государственное бюджетное образовательное учреждение высшего образования "Белгородский государственный технологический университет им. В.Г. Шухова" Дезинтегратор
RU2714773C1 (ru) * 2019-11-05 2020-02-19 федеральное государственное бюджетное образовательное учреждение высшего образования "Белгородский государственный технологический университет им. В.Г. Шухова" Дезинтегратор
RU2714774C1 (ru) * 2019-11-05 2020-02-19 федеральное государственное бюджетное образовательное учреждение высшего образования "Белгородский государственный технологический университет им. В.Г. Шухова" Центробежный дисковый измельчитель

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB135955A (en) * 1918-12-06 1919-12-08 William Stephenson Barron Improvements relating to Impact Grinders.
US1331969A (en) * 1915-12-23 1920-02-24 Allis Chalmers Mfg Co Rotary impact-pulverizer
GB191977A (en) * 1922-02-27 1923-01-25 George Porteus Improvements in or relating to disintegrators
DE699100C (de) 1939-10-25 1940-11-22 Adolf Steinbrueckner Hammermuehle
FR1015467A (fr) * 1950-01-17 1952-10-13 L Wetstein Ets Broyeur pour graines et produits granulés ou en morceaux
FR2084599A5 (fr) * 1970-03-13 1971-12-17 Estkolkhozproekt
DE3417556A1 (de) 1984-05-11 1985-11-21 AGEFA Aktiengesellschaft für Aufbereitungstechnologie, Zunzgen Desintegrator
EP0098441B1 (fr) 1982-07-08 1986-03-05 Bühler AG Installation avec au moins un broyeur
GB2166368A (en) * 1983-12-28 1986-05-08 Tallinsk Polt Inst Disintegrator
EP0051389B1 (fr) 1980-11-01 1987-01-21 Sardon International Limited Appareils à broyer
DE3708914A1 (de) 1986-03-24 1987-10-08 Buehler Ag Geb Anlage mit mindestens einer schlagmuehle
EP0692309A1 (fr) * 1994-07-14 1996-01-17 Bühler Ag Procédé pour mouture à percussion et broyeur à choc

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1331969A (en) * 1915-12-23 1920-02-24 Allis Chalmers Mfg Co Rotary impact-pulverizer
GB135955A (en) * 1918-12-06 1919-12-08 William Stephenson Barron Improvements relating to Impact Grinders.
GB191977A (en) * 1922-02-27 1923-01-25 George Porteus Improvements in or relating to disintegrators
DE699100C (de) 1939-10-25 1940-11-22 Adolf Steinbrueckner Hammermuehle
FR1015467A (fr) * 1950-01-17 1952-10-13 L Wetstein Ets Broyeur pour graines et produits granulés ou en morceaux
FR2084599A5 (fr) * 1970-03-13 1971-12-17 Estkolkhozproekt
EP0051389B1 (fr) 1980-11-01 1987-01-21 Sardon International Limited Appareils à broyer
EP0098441B1 (fr) 1982-07-08 1986-03-05 Bühler AG Installation avec au moins un broyeur
GB2166368A (en) * 1983-12-28 1986-05-08 Tallinsk Polt Inst Disintegrator
DE3417556A1 (de) 1984-05-11 1985-11-21 AGEFA Aktiengesellschaft für Aufbereitungstechnologie, Zunzgen Desintegrator
DE3708914A1 (de) 1986-03-24 1987-10-08 Buehler Ag Geb Anlage mit mindestens einer schlagmuehle
EP0692309A1 (fr) * 1994-07-14 1996-01-17 Bühler Ag Procédé pour mouture à percussion et broyeur à choc

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014127408A1 (fr) 2013-02-19 2014-08-28 Grains Research & Development Corporation Dispositif de dévitalisation de graines de mauvaises herbes
EP2958676A4 (fr) * 2013-02-19 2016-12-07 Grains Res & Dev Corp Dispositif de dévitalisation de graines de mauvaises herbes
AU2014218502B2 (en) * 2013-02-19 2018-07-12 Grains Research & Development Corporation Weed seed devitalization arrangement
CN114849882A (zh) * 2022-07-11 2022-08-05 陶瓷工业设计研究院(福建)有限公司 一种对撞式节能环保型陶瓷用的智能粉碎加工装置
CN114849882B (zh) * 2022-07-11 2022-09-16 陶瓷工业设计研究院(福建)有限公司 一种对撞式节能环保型陶瓷用的智能粉碎加工装置

Also Published As

Publication number Publication date
RU2176933C2 (ru) 2001-12-20
DE59605539D1 (de) 2000-08-10
ES2148640T3 (es) 2000-10-16
UA46733C2 (uk) 2002-06-17
CH690709A5 (de) 2000-12-29
EP0764470B1 (fr) 2000-07-05

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