EP0053755A2 - Procédé et installation pour le broyage à impact - Google Patents

Procédé et installation pour le broyage à impact Download PDF

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Publication number
EP0053755A2
EP0053755A2 EP81109859A EP81109859A EP0053755A2 EP 0053755 A2 EP0053755 A2 EP 0053755A2 EP 81109859 A EP81109859 A EP 81109859A EP 81109859 A EP81109859 A EP 81109859A EP 0053755 A2 EP0053755 A2 EP 0053755A2
Authority
EP
European Patent Office
Prior art keywords
impact
grinding
grain size
impact grinding
sieve
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
EP81109859A
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German (de)
English (en)
Other versions
EP0053755A3 (en
EP0053755B1 (fr
Inventor
Edwin Eisenegger
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
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Filing date
Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=25789583&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0053755(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from DE19803046173 external-priority patent/DE3046173A1/de
Priority claimed from DE19813138259 external-priority patent/DE3138259A1/de
Application filed by Individual filed Critical Individual
Priority to AT81109859T priority Critical patent/ATE21049T1/de
Publication of EP0053755A2 publication Critical patent/EP0053755A2/fr
Publication of EP0053755A3 publication Critical patent/EP0053755A3/de
Application granted granted Critical
Publication of EP0053755B1 publication Critical patent/EP0053755B1/fr
Expired legal-status Critical Current

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    • 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
    • B02C13/13—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft and combined with sifting devices, e.g. for making powdered fuel

Definitions

  • the invention relates to an impact grinding method of the type mentioned in the preamble of claim 1 and to an impact grinding system of the type mentioned in the preamble of claim 12 for carrying out the method.
  • the finished material that has passed through the sieve body within a desired grain size band is mechanically or pneumatically conveyed away, and after a first comminution phase it is still in the grinding chamber within the sieve casing the remaining portion of inadequately ground and not passed through regrind is withdrawn from this as return material and added to the size reduction, together with fresh raw material, by mechanical recycling.
  • the object of the invention is to develop a method of the type mentioned in the preamble of claim 1 in such a way that the overall efficiency for producing a finished product within a specific grain size range is improved and the proportion of very fine material is reduced, the grain size of which is significantly smaller than that determined by the sieve jacket is, as well as to create an impact grinding system for performing the method.
  • Embodiments of the invention are set out in the subclaims and the impact grinding system according to the invention is specified in claim 12.
  • the invention is particularly advantageous for use in grain and animal feed milling, whose raw materials are inhomogeneous and of different densities and whose finished goods are of different weights. These properties make grain size separation difficult, which is generally only possible through sieving.
  • the method according to the invention is characterized in that before the end of an impact grinding phase, that is to say before the grinding path has completely run through, i.e. before the feed point is reached again by the grinding stock previously fed in for an impact grinding phase, at least a large part of the not the ground material that has passed through is removed and thus removed from the impact grinding.
  • This removal of the portion of regrind that has not passed through the screen jacket preferably takes place shortly before reaching the feed point for the raw material, so that with the screen jacket extending essentially over the entire grinding path, a large part of the regrind that has already been comminuted to the required grain size can pass through the screen jacket as finished product , while a portion of the material to be ground, which also already has the required grain size, together with a portion not yet required
  • the grain size of the crushed excess material, both of which have not passed through the screen jacket is subtracted and thus removed from the impact grinding.
  • These extracted portions of the ground material are subjected to a grain size separation in order to separate the finished product portion from the excess material portion.
  • the portion of excess material is re-fed to the impact grinding together with fresh raw material, while the portion of finished product separated in the grain size separation is removed together with the finished product which has passed through the screen jacket.
  • the grain size separation of the regrind portion removed from the impact grinding takes place by sieving, which ensures a simple and reliable separation of the finished product portion from the oversize portion.
  • the regrind that has passed through the sieve jacket is also fed to the grain size separation, so that this regrind fraction is also subjected to a test for correct grain size in order to to ensure that the finished product released from the grain size separation actually lies in the predetermined grain size band, which is particularly necessary in the case of fully automatic operation of such a system. If, on the other hand, excess material is also contained in the proportion of regrind that has passed through the sieve jacket, this excess material is also fed back into the feed device via the first outlet of the grain size separating device.
  • ground material alone can be removed from the grinding chamber without this having to pass through the sieve jacket.
  • the grain size can be controlled. The larger the opening cross-section of the sieve jacket released by the slide and / or the flap, the greater the grain size of the ground material fed to the grain size separating device. If, on the other hand, both the slide and the flap are closed, the conventional grinding process is carried out, in which only the ground material which has passed through the screen casing is fed to the particle size separating device. In this conventional grinding process, however, there is more drive energy to apply than in the grinding process specified by the invention.
  • the impact, centrifugal or hammer mill 1 with the finished goods collecting space 11 within a housing 12 has a mill outlet 13 which opens into a pneumatic conveying path 14 as a discharge device.
  • the feed device 2 connects to a raw material hopper or feed container 21. This comprises a vibrating conveyor trough 22 and an adjoining feed shaft 23.
  • the feed shaft 23 is connected to the actual grinding unit 3 of the impact mill 1.
  • a grinding rotor 31 with impact tools or grinding hammers 32 is radially surrounded by a screen jacket 33 and rotatably arranged within the finished product collecting space 11 and driven in a known manner by a drive motor, not shown here.
  • a cavity 34 is formed within the screen jacket 33 in the region of the impact tools 32, into which the feed shaft 23 opens.
  • a grain size separating device 4 consists of a sieve housing 41 with an oscillating drive 42 and an oscillatable bearing 43.
  • a sieve grating or mesh 44 adapted to the desired grain size separation is provided in the sieve housing 41.
  • the vibrating conveyor trough 22 is connected to the screen housing 41 and thus to the common vibratory drive 42.
  • a withdrawal device 51 from the grinding chamber 34 is arranged in a subsequent discharge or return line 52 in the screen jacket 33.
  • the return line opens into a cyclone separator 53, which is connected to the grain size separating device 4 by an air lock, in particular a cellular wheel lock 55.
  • An air outlet 54 of the cyclone separator 53 and the conveying section 14 can be designed in a known manner as pneumatic conveying and aspiration systems with blowers and separators. On the other hand, it can be used for pneumatic return via the return line 52
  • Required air pressure can also be generated by the grinding rotor 31 or an impeller connected to it or formed on it.
  • the regrind remaining in the grinding chamber 34 as far as the extraction device 51 arrives as return material from the impact grinding into the return line 52 and in this through pneumatic conveying into the cyclone separator 53 and out of this through the air lock 55 into the grain size separating device 4.
  • the return material is separated into falling through finished goods and a surplus share as a rejection.
  • the finished product which has fallen through passes through the finished product outlet 46 to the finished product from the impact grinding phase in the collecting space 11
  • the excess material flows from the repelling overflow 45 into the feed device 2 and from this together with fresh raw material into the grinding chamber 34 for one through Mouth of the feed shaft 23 and the extraction device 51 along the screen jacket 33 limited impact meal phase.
  • each make-up for each impact grinding phase takes place through a mixture of raw material from the feed container 21 and excess material from the grain size separating device 4.
  • This impact grinding process in such an impact grinding system ensures that the finished product produced during the impact grinding phase is largely discharged through the screen jacket, so that the rest ; Finished product parts carried over by return material in the grinding chamber are subjected to a grain size separation and thus separated from insufficiently comminuted excess material, so that only a small amount of excess material is fed to a further impact milling phase.
  • the efficiency is improved thanks to the substantial relief of the finished product in the impact grinding phases and the power requirement is reduced, as is the screen area requirement and the size of the grain size separating device.
  • FIG. 2 of the drawing works in a similar manner to the embodiment shown in FIG. 1, a further cyclone separator 58 being shown, which is connected to the conveying path 14 in order to remove the finished product discharged by it separating it conveying air, the cyclone separator 58 is connected in a known manner to a suction fan 59 which is driven by a motor 60.
  • a cellular wheel sluice 61 is provided below the cyclone separator 58 and serves as an air sluice in order to improve the effect of the suction blower 59 on the conveying path 14 or the collecting space 11.
  • the air outlet 54 of the cyclone separator 53 can also be connected to the suction fan 59 in order to support the conveying of the material to be returned in the return line 52.
  • the repulsion overflow 45 of the grain size separating device 4 is connected to the grinding chamber 34 separately from the feed shaft 23.
  • an airlock 56 which is preferably also designed as a cellular wheel sluice and which pneumatically decouples the space of the grain size separating device 4 above the sieve grating 44 relative to the grinding chamber 34.
  • a further air lock 57 which is also preferably a cellular wheel lock, is also provided between the finished product outlet 46 of the grain size separating device 4 and the collecting space 11 in order to pneumatically decouple it from the space of the grain size separating device 4 formed below the screen grid 44.
  • the grinding rotor 31 is designed as an impeller or is combined with an impeller, which in the exemplary embodiment shown is indicated by impeller blades 61.
  • the repulsion overflow 45 and the finished product outlet 46 are pneumatically decoupled from the grinding chamber 34 and the collecting chamber 11 with the aid of air locks 56 and 57.
  • the feed of the raw material and also of the excess material discharged from the repulsion overflow 45 takes place centrally from the end face of the screen jacket, as can be clearly seen in particular from FIG. 4.
  • the effective length of the screen jacket 33 can be increased since it is only interrupted by the trigger device 51.
  • this embodiment differs from that of the embodiment shown in FIG. 2 only in that a separate Another suction blower 59 is not required, since the air pressure required for the return of the ground material removed from the extraction device 51 from the grinding process and also for the discharge of the finished material collected in the collecting chamber 11 or a required air flow through the grinding rotor 31 designed as an impeller itself becomes.
  • the remaining mode of operation corresponds to that of the exemplary embodiments shown in FIGS. 1 and 2.
  • FIG. 5 Another exemplary embodiment of the invention is explained with reference to FIG. 5, in which the same or with reference numerals denote the same or corresponding components as in the previous exemplary embodiments.
  • the grain to be ground is fed from a feed container 21 via a feed shaft 23 to a metering screw 22 ′, then fed to a feed device 2, which feeds the grain into a grinding chamber 34 formed within a sieve jacket 33.
  • Impact tools 32 circulate within the screen jacket 33, and their direction of rotation can be selected either clockwise or counterclockwise.
  • Extraction devices 51 'and 51'' are provided on both sides of the feed opening in the sieve jacket 33, which can be optionally closed by flaps 68 and 68', so that at most one of the extraction devices is open and thus effective to remove regrind from the grinding chamber 34 can.
  • Both the extraction devices 51 'and 51''and the opening which can be closed with the slide 67 open into a space 11 surrounding the screen jacket 33, into which the ground material passing through the screen jacket also passes.
  • the space 11 is connected to a discharge screw 62, which conveys the regrind entering the space 11 to a third outlet 63, from which the regrind is passed via an airlock 55 'to a bucket elevator 52', which is the return line for the regrind forms.
  • the bucket elevator 52 conveys the regrind to a grain size separating device 4, which essentially consists of a sieve grid 44, whereby this grain size separating device 4 can be designed in the same way as is explained in more detail in the main patent.
  • the grain size separating device has a first outlet 45 for the oversize material which does not pass through the sieve grid 44 and a second outlet 46 for the finished material which has passed through the sieve grid and whose grain size is thus within the predetermined grain size range.
  • the first outlet 45 is connected to the metering screw 22 ′ so that the excess material is fed from the metering screw to the feed device 2.
  • the second outlet 46 is connected to a discharge device 14 ′, which is shown only schematically here, and which conveys the finished product.
  • the space 11 and the housing having the discharge screw 62 are connected via a filter 64 to a fan 65 which is driven by a motor 66.
  • the fan 65 draws the room 11 or the entire Mahlan; order air, which is fed via a side air inlet provided on the feed device 2 of the grinding arrangement.
  • the feed device 2 can also perform a central feed in the direction of the axis of rotation of the rotor carrying the impact tools 32 instead of a peripheral feed of the ground material, as is shown in detail in FIG. 3 of the main patent .
  • the grain size separation into finished goods and oversized goods takes place with the aid of the screen grating 44, the finished goods having a grain size lying in the specific grain size range.
  • the finished product is fed to the discharge device 14 'via the second outlet 46.
  • the oversize material that does not pass through the screen grid 44 reaches the metering screw 22 ′ via the first outlet 45, which can be regulated depending on the load.
  • This excess material is passed together with fresh grain discharged from the feed container 21 via the feed shaft 23 to the feed device 2, via which the excess material is again fed into the grinding chamber 34.
  • the slide 67 is partially or completely opened in this method, in addition to the regrind removed from the grinding chamber 34 via the extraction device 51 ′ or 51 ′′, regrind is removed from the grinding chamber 34, as a result of which the grain size of the grain size separating device 4 is fed Grist can be determined.
  • the slide 67 can also be opened completely. In this case, both flaps 68 and 68 'can then be closed sen, since then the regrind to be withdrawn from the grinding chamber, which has not passed through the screen jacket 33, can be removed only through the opening released by the slide 67.
  • the process according to the invention or the plant according to the invention ensures, by feeding all of the mill material removed from the grinding phase to the particle size separating device, that the material to be ground which has passed through the sieve jacket 33 is again subjected to a test for correct particle size. This ensures that even in the case of fully automatic operation of such an impact grinding system, in which no operating personnel monitors the impact grinding process, it is ensured that the finished product exactly adheres to a grain size lying in the particular grain size range.
  • conveying devices 22 ' As conveying devices 22 ', a discharge screw 62 and a bucket elevator 52' and have been shown schematically in the drawing, other conveying devices such as conveyor belts or the like can of course also be used, which will depend in each case on the length of the conveying path to be bridged.
  • control of the grain size explained in connection with the slide 67 can of course also be carried out additionally or alternatively by continuously adjusting the opening cross-section of the openings to be closed by the flaps 68 or 68 '.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Disintegrating Or Milling (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Crushing And Grinding (AREA)
EP81109859A 1980-12-08 1981-11-24 Procédé et installation pour le broyage à impact Expired EP0053755B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81109859T ATE21049T1 (de) 1980-12-08 1981-11-24 Prallmahl-verfahren und -anlage.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19803046173 DE3046173A1 (de) 1980-12-08 1980-12-08 Prallmahl-verfahren und -anlage
DE3046173 1980-12-08
DE19813138259 DE3138259A1 (de) 1981-09-25 1981-09-25 Prallmahl-verfahren und -anlage
DE3138259 1981-09-25

Publications (3)

Publication Number Publication Date
EP0053755A2 true EP0053755A2 (fr) 1982-06-16
EP0053755A3 EP0053755A3 (en) 1984-05-02
EP0053755B1 EP0053755B1 (fr) 1986-07-30

Family

ID=25789583

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81109859A Expired EP0053755B1 (fr) 1980-12-08 1981-11-24 Procédé et installation pour le broyage à impact

Country Status (5)

Country Link
US (1) US4586658A (fr)
EP (1) EP0053755B1 (fr)
CA (1) CA1172225A (fr)
DK (1) DK151773C (fr)
ES (1) ES507786A0 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993003844A1 (fr) * 1991-08-27 1993-03-04 Rudi Goldau Procede et dispositif de broyage
EP0613721A2 (fr) * 1993-03-02 1994-09-07 Herbert Strittmatter Procédé, son utilisation et dispositif de brayage et de traitement de produits de recyclage

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4730790A (en) * 1987-01-05 1988-03-15 Williams Patent Crusher And Pulverizer Company Waste material classifying and reducing apparatus
DE4124416A1 (de) * 1991-07-23 1993-01-28 Krupp Polysius Ag Einrichtung und verfahren zur zerkleinerung von mahlgut unterschiedlicher koernung
US5312052A (en) * 1992-06-01 1994-05-17 Dellekamp Michael D Method for reclaiming fiber reinforcement from a composite
US5505390A (en) * 1994-06-17 1996-04-09 Rodgers; Charles C. Two stage hammer mill with particle separator
US5797549A (en) * 1996-06-06 1998-08-25 Williams; Robert M. Apparatus for separating plastics from paper fiber
ES2147110B1 (es) * 1998-01-14 2001-03-16 Scoiner S L Maquina trituradora de desechos.
CA2568313A1 (fr) * 2005-11-16 2007-05-16 Rodney I. Booth Broyeur avec recirculation d'air
DE102010020395A1 (de) 2010-02-20 2011-08-25 Astrium GmbH, 82024 Vorrichtung zur Fixierung einer Testperson auf einer Standfläche
US9604227B2 (en) * 2013-06-21 2017-03-28 St. Martin Investments, Inc. System and method for processing and treating an agricultural byproduct
US20150258551A1 (en) * 2014-03-13 2015-09-17 Steven Cottam Grinder Mill
HUE049971T2 (hu) * 2014-05-28 2020-11-30 Cormo Ag Eljárás szuperabszorbens pelletek és/vagy rostos anyag elõállítására termési maradványokból
CN105983466A (zh) * 2015-02-11 2016-10-05 科立视材料科技有限公司 破坏如聚集硝酸钾粉饼等聚集体的压碎机
CN106362831B (zh) * 2016-08-05 2018-10-23 安徽安特食品股份有限公司 一种用于酒精原料粉碎的锤式破碎机
US10638665B2 (en) * 2017-10-23 2020-05-05 MedReleaf Corp. Apparatus and methods for the comminution of botanical feedstock
CN107694135B (zh) * 2017-11-13 2021-09-14 昆明特康科技有限公司 一种用于高湿高黏性物料干燥制粉的磨机及其运用方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR943826A (fr) * 1947-03-03 1949-03-18 Perfectionnements aux procédés de séparation et de récupération des matières broyées et dispositifs pour leur mise en oeuvre
SU139922A1 (ru) * 1961-01-17 1961-11-30 Н.Г. Гурари Дробильно-просеивающий агрегат, например, дл шквары
US3184170A (en) * 1962-04-10 1965-05-18 Universal Milling And Machiner Gas swept pulverizer
DE1221083B (de) * 1964-06-23 1966-07-14 Steinmueller Gmbh L & C Muehle mit Windsichter
DE1806610A1 (de) * 1968-11-02 1970-05-21 Hombak Maschinenfab Kg Schleudermuehle
DE2122622A1 (de) * 1971-05-07 1972-11-16 Ludwig Pallmann Maschinenfabrik und Mahlwerk KG, 6660 Zweibrücken Schlägermühle
US4183471A (en) * 1978-04-24 1980-01-15 George Pfister Alfalfa separator

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3078050A (en) * 1960-01-08 1963-02-19 Hardinge Harlowe Autogenous grinding process and mill systems to perform the same
US3106523A (en) * 1961-05-01 1963-10-08 Lefebvre Freres Limitee Grizzly bar feeder
US4339085A (en) * 1980-04-14 1982-07-13 Williams Robert M Reversible material reducing mill

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR943826A (fr) * 1947-03-03 1949-03-18 Perfectionnements aux procédés de séparation et de récupération des matières broyées et dispositifs pour leur mise en oeuvre
SU139922A1 (ru) * 1961-01-17 1961-11-30 Н.Г. Гурари Дробильно-просеивающий агрегат, например, дл шквары
US3184170A (en) * 1962-04-10 1965-05-18 Universal Milling And Machiner Gas swept pulverizer
DE1221083B (de) * 1964-06-23 1966-07-14 Steinmueller Gmbh L & C Muehle mit Windsichter
DE1806610A1 (de) * 1968-11-02 1970-05-21 Hombak Maschinenfab Kg Schleudermuehle
DE2122622A1 (de) * 1971-05-07 1972-11-16 Ludwig Pallmann Maschinenfabrik und Mahlwerk KG, 6660 Zweibrücken Schlägermühle
US4183471A (en) * 1978-04-24 1980-01-15 George Pfister Alfalfa separator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993003844A1 (fr) * 1991-08-27 1993-03-04 Rudi Goldau Procede et dispositif de broyage
EP0613721A2 (fr) * 1993-03-02 1994-09-07 Herbert Strittmatter Procédé, son utilisation et dispositif de brayage et de traitement de produits de recyclage
EP0613721A3 (fr) * 1993-03-02 1995-02-08 Herbert Strittmatter Procédé, son utilisation et dispositif de brayage et de traitement de produits de recyclage.

Also Published As

Publication number Publication date
EP0053755A3 (en) 1984-05-02
EP0053755B1 (fr) 1986-07-30
CA1172225A (fr) 1984-08-07
DK539581A (da) 1982-06-09
DK151773C (da) 1988-07-25
DK151773B (da) 1988-01-04
US4586658A (en) 1986-05-06
ES8304809A1 (es) 1983-03-16
ES507786A0 (es) 1983-03-16

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