EP3261765B1 - Walzenstuhl, aspirationsbaugruppe und verfahren zum nachrüsten eines walzenstuhles - Google Patents

Walzenstuhl, aspirationsbaugruppe und verfahren zum nachrüsten eines walzenstuhles Download PDF

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Publication number
EP3261765B1
EP3261765B1 EP16704674.7A EP16704674A EP3261765B1 EP 3261765 B1 EP3261765 B1 EP 3261765B1 EP 16704674 A EP16704674 A EP 16704674A EP 3261765 B1 EP3261765 B1 EP 3261765B1
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EP
European Patent Office
Prior art keywords
aspiration
grinding
roller mill
space
opening
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.)
Active
Application number
EP16704674.7A
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German (de)
English (en)
French (fr)
Other versions
EP3261765A1 (de
Inventor
Daniel Fischer
Daniel Rickenbach
Daniel Mark
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
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Buehler AG
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Publication of EP3261765A1 publication Critical patent/EP3261765A1/de
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Publication of EP3261765B1 publication Critical patent/EP3261765B1/de
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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
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/02—Crushing or disintegrating by roller mills with two or more rollers
    • B02C4/06—Crushing or disintegrating by roller mills with two or more rollers specially adapted for milling grain
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C11/00—Other auxiliary devices or accessories specially adapted for grain mills
    • B02C11/08—Cooling, heating, ventilating, conditioning with respect to temperature or water content
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/28—Details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/28—Details
    • B02C4/286—Feeding devices

Definitions

  • the present invention is concerned with roll mills for grinding regrind, in particular grain roll mills for milling cereals, with aspiration assemblies and with methods for retrofitting an existing roll mill.
  • Mill chairs for grinding regrind contain at least one grinding chamber in which the millbase, for example cereals, is ground.
  • the grinding chamber has at least one pair of grinding rollers.
  • roller mills usually have an inspection opening through which the grinding chamber is accessible below the grinding rollers and, for example, samples of the ground material to be ground are to be removed.
  • opening the inspection opening changes the air pressure and air flow conditions in the roller mill. This fact is problematic, because the roll mill should be able to freely carry out the usual controls during operation of the machine, without changing the grinding itself and, as far as possible, without unwanted dust escapes.
  • a good and reliable partial solution to this problem is in document DE 2 403 351 described, in which aspiration air from the peripheral region of a grinding roller via a separate from the roll mill funnel suction device to the hopper outlet or to the pneumatic feed line inlet passes.
  • An in DE 2 403 351 preferred solution is to guide this suction device along the rear wall of the funnel. In practice, such a suction device is separated from the hopper by aspiration plates.
  • a coarser MahlstaubaultDelete, for example, from the inspection opening itself is also prevented by these existing in roll chairs Aspirationsbleche and the associated air flows.
  • the ground material is conveyed by means of a pneumatic conveyor of an outlet of the mill chute away. This conveyor provides a vacuum in the grinding chamber, which ensures that the grind dust can not escape from the inspection opening into the environment when opening the inspection opening due to the resulting draft.
  • the roll mill is thus to be further developed in such a way that, when an inspection opening is opened, even less mill dust exits the roll mill into the environment and that it is possible to dispense with aspiration sheets as far as possible in order to solve the condensation problem described.
  • the grinding chamber usually contains at least one pair of grinding rollers with which the grain is grindable.
  • Roller mills usually also contain a feed region for feeding ground material to be ground into the grinding chamber.
  • a feed region contains a dining area in which the ground material to be ground can be kept ready, as well as a metering device with which the ground material can be metered from the dining area into the grinding space.
  • the feed area and in particular its dining area are not attributed here and below to the grinding chamber.
  • said partition wall and its aspiration opening are thus not formed between the aspiration space and the dining area.
  • the aspiration space is separated from the grinding space by a closable partition wall, ie it does not form part of the grinding space itself.
  • the aspiration space can be formed in the interior of the roller mill. But it is also conceivable that the aspiration space is formed by the environment of the roll mill.
  • the dividing wall is substantially impermeable to aspiration air, so that it can penetrate the dividing wall at most through the aspiration opening.
  • the closure element is controllable such that it is in dependence on the differential pressure in the open position or the closed position or moved into one of these positions.
  • the pressures in the grinding chamber and in the aspiration space can be measured directly with the aid of respective pressure measuring devices in the grinding chamber or in the aspiration chamber.
  • the differential pressure can then be calculated.
  • the closure element can be controlled so that it is in the open position or in the closed position.
  • an indirect solution is also conceivable and covered by the invention, in which, for example, an inspection opening door sensor system determines whether the inspection door is open or closed and in which the closure element is regulated or controlled under the indirect conclusion, in that the closure element is closed when the inspection opening door is open and the closure element is open when the inspection opening door is closed, so that the pressure conditions between the grinding chamber and the aspiration chamber are as described above.
  • the control of the closure element can be done, for example, pneumatically or electrically.
  • the closure element is thus located or moved directly into the opening position or closing position due to an overshoot or undershoot.
  • processing units and controls described above can therefore be omitted here.
  • the dividing wall with the at least one aspiration opening is preferably arranged in the vicinity of the feed region and more preferably in the vicinity of the metering device of the feed region. In this way, the aspiration air in the vicinity of the feed region or preferably in the vicinity of the metering device of the feed region can penetrate into the grinding chamber.
  • the partition is arranged with the at least one aspiration opening in the upper region of the grinding chamber, ie also above the grinding rollers arranged in the grinding chamber. As a result, the aspiration air in the upper region of the grinding chamber and thus also penetrate above the grinding rollers in the grinding chamber.
  • the closure element is designed and arranged such that, when the threshold value is signed, it is in the closed position due to its own weight or moves from the opening position into the closed position.
  • This training can be realized structurally simple and requires only a minimum of minor maintenance.
  • the closure element is preferably designed and arranged such that, when the threshold value is exceeded, it is in the open position due to the differential pressure or moves from the closed position into the open position.
  • closure element is biased in the direction of the opening position or in the direction of the closed position. This bias can be achieved with at least one spring.
  • the closure element is designed as a pivotable closure flap.
  • this closure flap can be pivotable about a pivot axis which extends substantially horizontally.
  • a substantially horizontal course is understood to mean an angle between the pivot axis and a horizontal plane which is less than 15 °, preferably less than 10 ° and particularly preferably less than 5 °.
  • the pivot axis preferably extends substantially parallel to the axes of rotation of the grinding rollers present in the grinding chamber. Analog here also means "substantially parallel" that the angle between the pivot axis and rotation axes of the grinding rollers is less than 15 °, preferably less than 10 ° and particularly preferably less than 5 °.
  • the closure flap in the closed position S is tilted at an angle relative to a vertical. In this way, a secure closure of the aspiration opening in the closed position can be achieved.
  • the said angle can be in the range of up to 45 °, preferably of up to 10 °, particularly preferably of 2 ° to 3 °.
  • the partition only has a single aspiration opening.
  • this can lead to difficulties if this single aspiration opening must be comparatively large in order to allow a sufficient supply of air. Because then the closure element must be dimensioned correspondingly large, which may possibly lead to insufficient sealing of the aspiration in the closed state.
  • aspiration openings are provided in the partition wall.
  • these aspiration openings are arranged substantially along the entire length of the grinding rollers of the roller mill.
  • a respective separate closure element is preferably provided for each of the aspiration openings, which is designed to open and close only this associated aspiration opening. This also contributes to a better sealing of the aspiration openings in the closed position.
  • At least one closure element is designed for simultaneously opening and closing a plurality of the aspiration openings.
  • the number of total required closure elements can be reduced, which reduces the design effort.
  • the roller mill can have at least one securing element, which is designed and arranged such that it prevents the closure element from falling into the grinding space. In this way it can be prevented that in the accidental detachment of the closure element this formed in the grinding chamber and in particular even in the between the grinding rollers Mahlspalt falls into it.
  • the securing element may be formed, for example, as a securing bracket.
  • the roller mill may further include at least one inspection opening through which the grinding chamber is accessible, for example, for the removal of a Mahlgutprobe.
  • the roller mill can contain at least one grinding chamber door with which the inspection opening can be opened or closed as desired.
  • the inspection opening, the grinding chamber door and the closure element are arranged and designed and matched to one another such that the differential pressure is above the threshold value with the grinding room door closed and below the threshold value when the grinding room door is open.
  • An opening of the grinding chamber door thus has the consequence that the closure element is in the closed position or moves there, in which the aspiration opening is closed, so that no grinding dust can escape through it into the surroundings of the roller mill.
  • the roller mill can also have negative pressure means or be connected or connectable to such negative pressure means.
  • This vacuum means may be formed, for example, by a pneumatic conveying system arranged in the region of an outlet of the roller mill, with the aid of which the ground grinding stock can be conveyed away from the outlet.
  • the roller mill comprises at least one frame and an aspiration assembly detachably connected to this frame.
  • This aspiration assembly contains at least the at least one partition wall, the at least one aspiration opening formed in the partition wall and the at least one closure element.
  • the aspiration assembly is formed as an elongate strip, which in its longitudinal direction substantially extends along the entire length of the grinding rollers of the roller mill.
  • the aspiration assembly may have a substantially rigid support in which the at least one aspiration opening is formed and on which the closure elements are arranged.
  • the Aspirationsbaueria may contain a fuse element as mentioned above, which is connectable to the holder, in particular releasably connectable.
  • the aspiration assembly may further include attachment means for releasably connecting the aspiration assembly to the frame of the roller mill.
  • the aspiration assembly preferably contains at least one flexible seal, with which it can be applied to a boundary wall of the grinding chamber. The flexible seal allows a close fit of the aspiration assembly on the boundary wall and thus prevents passage of the aspiration air at undesirable locations.
  • the holder together with the at least one seal forms the dividing wall of the aspiration assembly.
  • the summary of the partition wall, the aspiration opening and the closure element and optionally the securing element in a releasably connected aspiration assembly has the advantage that this Aspirationsbauou can be used in an existing roller mill and if necessary (for example, for cleaning, maintenance or repair purposes) from the frame of Roller chair can be removed.
  • the at least one partition wall, the at least one aspiration opening and the at least one closure element may independently of one another have one, several or all of the properties described above in connection with the roller mill according to the invention and therefore provide the respective advantages also explained above.
  • the aspiration space can be created by retrofitting the partition into an interior of the roller mill. By inserting the partition can thus be carried out a separation of an original larger grinding chamber of the existing roller mill in a smaller grinding chamber and an aspiration.
  • the at least one partition wall, the at least one aspiration opening and the at least one closure element can be used as separate components in the existing roller mill.
  • the at least one partition wall, the at least one aspiration opening formed in the partition wall and the at least one closure element are part of a common aspiration module, in particular an aspiration module according to the invention as described above. Then namely, the said components can be used together in the existing roller mill.
  • the FIG. 1 shows a cereal roller chair 10 for grinding cereals.
  • the roller mill 10 contains a distributor element 31 with an inlet depot 32 arranged above it. With the aid of the distributor element 31, grain flowing in through the inlet depot 32 is divided into two food spaces 33, 33 'of respective feed areas 12, 12'. By means of respective metering devices 34, 34 'of the feed regions 12, 12', the grain is metered into grinding chambers 11, 11 '. There it is ground by means of respective pairs of grinding rolls 35, 35 '.
  • FIG. 2 shows in an enlarged view again the feed area 12 with the dining room 33 and the metering device 34 and the aspiration assembly 23, which is arranged in the upper region of the grinding chamber 11 and this grinding chamber 11 separates from the aspiration 21.
  • the aspiration assembly 23 is in FIG. 3 shown in more detail again. It contains a rigid, for example made of aluminum holder 36 having a first horizontal portion 37, a vertical portion 38 and a second horizontal portion 39. At a first end of the first horizontal portion 37 is located by means of a first seal 40 at a first boundary wall 24th of the roll mill 10 at. At the opposite end of the first horizontal portion 37, the upper end of the vertical portion 38 connects. The lower end of the vertical section 38 merges into the second horizontal section 39, the opposite end of which abuts against a second boundary wall 25 of the roller mill 10 by means of a second seal 41.
  • the holder 36 thus forms, together with the first seal 40 and the second seal 41, a partition wall 17 which separates the grinding chamber 11 from the aspiration space 21.
  • a first projection 42 having a groove-shaped recess 43.
  • this recess 43 is designed as a closure flap 14 closure element mounted (see also FIG. 5 ).
  • the flap 14 is pivotally suspended, namely about a pivot axis which is parallel to the axes of rotation of the grinding rollers 35 (ie perpendicular to the plane).
  • a plurality of aspiration openings 13 are present, of which only one can be seen here.
  • a second projection 44 From the first horizontal portion 37 extends downwardly a second projection 44, and from the second horizontal portion 39 extends down a third projection 45. Furthermore, a notch 47 is provided in the transition region 46 between the first horizontal portion 37 and vertical portion 38. By means of the second projection 44, the third projection 45 and the notch 47, a securing element 18 designed as a securing element is clamped to the holder 36, which prevents the closing flap 14 from falling into the grinding space 11.
  • closure flap 14 can securely close the aspiration opening 13 in the closed position S
  • the inventive Aspirationsbauen 23 is shown separately in a perspective view, but here first without the securing bracket 18 (this is only in FIG. 6 shown).
  • the aspiration assembly 23 is formed as an elongated strip which extends along a longitudinal direction L. This longitudinal direction L extends in the inserted state of the aspiration assembly 23 in the horizontal direction and parallel to the axes of rotation of the grinding rollers 11.
  • the first horizontal portion 37 and the second horizontal portion 39 of the holder 36 and the two seals 40, 41 are formed in a profile shape; in other words, they have along the longitudinal direction L a respective constant cross-section. With the exception of the aspiration openings 13 and the vertical portion 38 is formed like a profile.
  • first protrusions 42 extending from the vertical portion 38 and the second protrusions 44 extending from the first horizontal portion 38 are not formed in a profile shape, but are present only at individual discrete locations.
  • Each of the closing flaps 14 is arranged between two respectively adjacent first projections 42.
  • Each of the closing flaps 14 has at the upper end two lateral extensions which are suspended in the depressions 43 of these two adjacent first projections 42.
  • the flaps 14 can be pivoted about the recesses 43 around.
  • FIG. 6 the aspiration assembly 23 is shown together with the securing bracket 18, which is clamped to the holder 36.
  • This has at the bottom of a plurality of struts 48, between which slots 49 are formed.
  • These slots 49 are dimensioned such that aspiration air flowing in through the aspiration openings 13 can pass through these slots 49, but accidentally released closure flaps 14 can not fall through them into the grinding space 11.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Disintegrating Or Milling (AREA)
EP16704674.7A 2015-02-23 2016-02-17 Walzenstuhl, aspirationsbaugruppe und verfahren zum nachrüsten eines walzenstuhles Active EP3261765B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP15156142 2015-02-23
PCT/EP2016/053377 WO2016135025A1 (de) 2015-02-23 2016-02-17 Walzenstuhl, aspirationsbaugruppe und verfahren zum nachrüsten eines walzenstuhles

Publications (2)

Publication Number Publication Date
EP3261765A1 EP3261765A1 (de) 2018-01-03
EP3261765B1 true EP3261765B1 (de) 2019-05-08

Family

ID=52544376

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16704674.7A Active EP3261765B1 (de) 2015-02-23 2016-02-17 Walzenstuhl, aspirationsbaugruppe und verfahren zum nachrüsten eines walzenstuhles

Country Status (9)

Country Link
US (1) US10946385B2 (zh)
EP (1) EP3261765B1 (zh)
JP (2) JP2018506428A (zh)
KR (1) KR102062967B1 (zh)
CN (1) CN107787250B (zh)
BR (1) BR112017017833B1 (zh)
ES (1) ES2732043T3 (zh)
RU (1) RU2667739C1 (zh)
WO (1) WO2016135025A1 (zh)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107149976A (zh) * 2017-05-31 2017-09-12 石林民翊农产品开发有限公司 一种自动化干果研磨粉碎设备
US10807098B1 (en) 2017-07-26 2020-10-20 Pearson Incorporated Systems and methods for step grinding
EP3605034B1 (de) * 2018-07-31 2021-09-22 Bühler AG Einlaufanordnung für einen walzenstuhl, walzenstuhl mit einer solchen einlaufanordnung, verfahren zur mahlgutfüllstandermittlung eines vorratsbehälters eines walzenstuhls
US10757860B1 (en) 2019-10-31 2020-09-01 Hemp Processing Solutions, LLC Stripper apparatus crop harvesting system
US10933424B1 (en) 2019-12-11 2021-03-02 Pearson Incorporated Grinding roll improvements
CN112403581B (zh) * 2020-10-27 2022-07-15 重庆市涪陵区金莹粮油有限公司 一种可防止结块的高效谷物研磨装置
CN114534841B (zh) * 2022-02-09 2023-03-31 无锡锡麦粮油装备工程有限公司 通过直驱电机进行驱动的磨粉机

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Also Published As

Publication number Publication date
RU2667739C1 (ru) 2018-09-24
CN107787250A (zh) 2018-03-09
BR112017017833A2 (pt) 2018-04-10
BR112017017833B1 (pt) 2021-07-06
CN107787250B (zh) 2021-01-26
US10946385B2 (en) 2021-03-16
US20180021786A1 (en) 2018-01-25
EP3261765A1 (de) 2018-01-03
JP2018506428A (ja) 2018-03-08
WO2016135025A1 (de) 2016-09-01
JP2020040067A (ja) 2020-03-19
KR20170118850A (ko) 2017-10-25
KR102062967B1 (ko) 2020-01-06
JP6938600B2 (ja) 2021-09-22
ES2732043T3 (es) 2019-11-20

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