US3684200A - Grinding apparatus - Google Patents

Grinding apparatus Download PDF

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Publication number
US3684200A
US3684200A US884603A US3684200DA US3684200A US 3684200 A US3684200 A US 3684200A US 884603 A US884603 A US 884603A US 3684200D A US3684200D A US 3684200DA US 3684200 A US3684200 A US 3684200A
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United States
Prior art keywords
grinding
housing
stationary
holder members
discs
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Expired - Lifetime
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US884603A
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English (en)
Inventor
Rolf Bertil Reinhall
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Individual
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Individual
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Publication of US3684200A publication Critical patent/US3684200A/en
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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
    • B02C7/00—Crushing or disintegrating by disc mills
    • B02C7/11—Details
    • B02C7/14—Adjusting, applying pressure to, or controlling distance between, discs

Definitions

  • This invention relates to a grinding apparatus.
  • this invention relates to a grinding apparatus with grinding discs arranged within a casing, of which discs at least one is rotatable and which discs between themselves form a grinding space for the grinding produce consisting of vegetable or similar material.
  • the grinding discs are constructed so that a gradual disintegration such as defibration and/or raffrnation of the produce passing through the grinding interspace is effected.
  • the grinding discs forming part of the apparatus are for this purpose subdivided into various grinding zones which are composed of ribs and grooves of mutually differing shapes. It is also known to conduct the grinding process in several stages between varying separate grinding members cooperating in pairs in order to attain a desired degree of disintegration of the vegetable or organic material.
  • One main object of the invention is to provide a grinding apparatus of the type in consideration which renders possible a treatment in two or more stages of the grinding produce between one and the same pair of grinding discs rotating relatively one another.
  • at least the one grinding disc is composed of two concentric disc elements of which the inner one is axially adjustable relatively to the outer one for compensation of the nonuniform wear on the grinding surfaces of the elements. This wear is greatest in the inner or primary grinding zone which receives the coarser grinding produce whereas the produce when entering the outer or secondary grinding zone already has been subjected to a homogenization or pre-working.
  • the non-uniform wear has previously rendered necessary replacement of the entire grinding assembly due to wear in the inner zone only, since otherwise the less effective primary grinding in this zone would have an disadvantageous reaction on the treatment in the outer grinding zone.
  • a further object of the invention is to provide a grinding apparatus which renders possible that the outer part of the grinding space can be adjusted with precision to a predetermined width, which often is so small as 0.02 to 0.03 mms, especially in refiners.
  • the dimensions of the grinding space in the outer zone can be of the same order of magnitude, as the diameter of the individual cellulose fibers present in the grinding produce. Then it is essential that the outer grinding zone is formed of disc elements which are fixed stationary so that they retain a fully controllable position.
  • FIG. 1 shows a longitudinal sectional view of a portion of a grinding apparatus constructed according to an embodiment of the invention.
  • FIG. 2 shows a portion of the apparatus in the same section as in FIG. 1, but on a greater scale.
  • FIG. 3 shows a portion of an apparatus according to a modified embodiment of the invention.
  • reference numeral denotes a portion of the rigid stand of the grinding apparatus which stand forms a casing and within which a shaft 12 carrying a grinding disc 14 is mounted rotatably.
  • the grinding disc carries disc elements 16 and 18 arranged concentrically in known manner and usually composed of segments. Disposed in the center may be a disc 20 which feeds the grinding produce radially outwards.
  • a stationary grinding disc is according to the invention composed of two concentrically arranged annular holder members 22, 24 for grinding disc elements 26 and 28, respectively, which also each of them is composed of segments.
  • Formed between said stationary disc elements 26, 28 and the rotatable disc elements l6, 18 is a grinding space 30, 31, to which the produce to be ground is supplied e.g. in the form of chips or fiber pulp through a central channel 32.
  • the grinding disc segments are in known manner provided with grooves and ribs.
  • the outer holder member 22 is rigidly secured in the stand 10 by means of screws 34 equally spaced around the circumference.
  • Formed axially of the confronting circumferential surfaces between the two annular holder members 22, 24 are radially extending interengaging threads 36 so that the inner holder member 24 when being rotated changes its axial location relative the outer holder member 22.
  • This rotation may be brought about e.g. by having the holder member 24 formed with a recess 37 having an inner gear rim 38 which is engaged by a gear wheel 40 which is mounted on a shaft 42 in the stand 10 and which can be rotated by rnears of a hand wheel 44.
  • the gear wheel 40 is locked in desired position by means of a nut 46.
  • the thread joint 36 between the outer stationary holder member or stator ring 22 and the inner rotatable and axially adjustable holder member or rotor ring 24 is supplied with pressure oil or grease through a conduit 48, so that the joint is continuously kept filled with such lubricant.
  • the lubricant is prevented from penetrating out from the thread joint by means of sealing devices such as O-rings 50, 52.
  • the thread joint is here formed with such a thread profile that it can take up axial forces acting on the inner grinding member.
  • the advantage is attained that the grinding which may comprise defibration and/or refining, can be conducted in two stages with grinding spaces 30, 31 independent of one another with respect to their widths, but within the same pair of mutually cooperating grinding members.
  • the secondary grinding space 31 is adjusted with high precision through adjustment in axial direction of the rotating grinding member 14 of the grinding apparatus and the disc elements associated therewith. This adjustment is readjusted in response to the wear on the outer grinding members so that the desired degree of defibration or raffination is obtained.
  • the axial adjustment of the rotatable grinding member may be effected by means of a servomotor in the manner known from e.g. US. Pat. No. 2,891,733.
  • the inner grinding space 30 within which the primary grinding process takes place is adjusted independently of the outer grinding space 31 determined with high precision, to a considerably greater space width by control of the annular holder member 24 and the disc element 28 supported by the same.
  • the greater wear in this inner or primary grinding zone can in an easy manner be compensated for by adjusting the axial position of the inner grinding members 24, 28 by means of the hand wheel 44.
  • the outer grinding ring 26 is firmly anchored within the stator ring as the width of the space in this way can be adjusted with high precision for the secondary grind ing stage. According to the invention it is possible to work here with grinding spaces within the diameter for the individual cellulose fibers and less.
  • FIG. 3 differs from the preceding one substantially by the annular inner holder member 24 being actuated by a servomotor or a pressure device 54 which has a piston rod 56 which is rigidly secured to the stator ring 24 and carries a piston 58.
  • Said piston subdivides the interior space of the servomotor into two chambers to which pressure medium such as oil can be supplied through conduits 60, 62 from a pilot valve 64 of a kind known per se.
  • This valve is provided with a valve body 66 which depending on its axial position directs pressure fluid to the pressure device 54 through one or the other of the conduits 60, 64 as is described in the U.S. Pat. No 2,971,704, for example. Pressure fluid is fed to the valve 64 through a conduit 68.
  • a control nut 70 or similar means is screwed on the outer end of the piston rod 56.
  • This nut cooperates with the valve body 66 in such a manner that when the inner annular holder member 24 due to an instantaneously occurring overloading emanating from the grinding produce is pushed to the left according to FIG. 3 from some predetermined position, the valve body 66 is actuated for supply of pressure fluid through the conduit 60 to the left-hand side of the servomotor 54, the holder member 24 and the disc element 28 thereby being subjected to increased pressure and pushed in a direction towards the rotating grinding disc 14 until a state of balance has been reached again.
  • the adjusting nut 70 may be graduated so that it indicates various grinding interspaces which may come into consideration.
  • a plurality of servomotors or pressure devices 54 may be arranged around the circumference of the stator casing and be controlled either individually or when coupled together mechanically by means of a roller chain or through electrical rotating members, for example.
  • the servomotor or pressure devices according to FIG. 3 may be replaced by lockable setting screws which enter screw threads formed in the stator and which can be rotated manually or coupled together so, that they are actuated simultaneously for adjusting the axial position of the inner stator ring 24, 28.
  • These setting screws may include an attachment screw which is entered by screwing into the stator and through which the screwing in of a fixing built into the stator ring 24 is effected.
  • the valve 64 (H6. 3) may be dispensed with, the grinding member 24, 28 with a socalled floating grinding space being kept pressed against the grinding produce with an adjustable pressure which is transmitted through one or several pressure devices 54.
  • a grinding apparatus comprising a housing, a pair of grinding discs arranged within said housing and having grinding surfaces thereof confronting one another, one of said discs being stationary and composed of a plurality of concentrically arranged annular holder members for grinding disc elements, each composed of segments, the radially outer one of said holder members being rigidly fixed within the housing; the radially inner one of said holder members being mounted on the inner end of a rotatable shaft extending into said housing; said stationary and rotatable discs forming a grinding space therebetween for vegetable or similar produce to be disintegrated by defibration and refining of the same, said annular holder members having their confronting circumferential surfaces formed with interengagng threads extending radially outward of said circurnferential surfaces; and means actuable externally of the housing for adjusting the axial position of the radially inner one of said concentrically arranged annular holder members relative to said radially outer one thereof, said threads permitting said axial adjustment to
  • a grinding apparatus comprising a housing, a pair of grinding discs arranged within said housing and having the grinding surfaces thereof confronting one another, one of said discs being stationary and composed of a plurality of concentrically arranged annular holder members for grinding disc elements, each composed of segments, the radially outward one of said holder members being rigidly fixed within the housing; the radially inner one of said holder members being mounted on the inner end of a rotatable shaft extending into said housing; said stationary and rotatable discs forming a grinding space there-between for vegetable or similar produce to be disintegrated by defibration and refining of the same, and means actuable externally of the housing for adjusting the axial position of the radially inner one of said concentrically arranged annular holder members relative to said radially outer one thereof to compensate for the greater wear upon said inner grinding disc elements while maintaining the outer disc elements of said stationary grinding disc finnly anchored to said stationary holder member, said externally actuable adjusting means comprising a

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Crushing And Grinding (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
US884603A 1968-12-20 1969-12-12 Grinding apparatus Expired - Lifetime US3684200A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE17634/68A SE327624B (cs) 1968-12-20 1968-12-20

Publications (1)

Publication Number Publication Date
US3684200A true US3684200A (en) 1972-08-15

Family

ID=20303819

Family Applications (1)

Application Number Title Priority Date Filing Date
US884603A Expired - Lifetime US3684200A (en) 1968-12-20 1969-12-12 Grinding apparatus

Country Status (15)

Country Link
US (1) US3684200A (cs)
AT (1) AT326985B (cs)
BE (1) BE743268A (cs)
CA (1) CA928545A (cs)
CH (1) CH502126A (cs)
CS (1) CS166722B2 (cs)
FI (1) FI49336C (cs)
FR (1) FR2026703A1 (cs)
GB (1) GB1283591A (cs)
NL (1) NL6918587A (cs)
NO (1) NO129918B (cs)
PL (1) PL72708B1 (cs)
RO (1) RO54851A (cs)
SE (1) SE327624B (cs)
YU (1) YU31887B (cs)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4052012A (en) * 1974-03-13 1977-10-04 Mill & Mix Company, Inc. Portable flour mill
US5398876A (en) * 1993-07-15 1995-03-21 Reinhall; Ulf B. Apparatus and method for refining pulp stock
US5564636A (en) * 1994-03-08 1996-10-15 Hawo's Kornmuhlen Gmbh Millwork for a grain mill
US6024308A (en) * 1998-11-11 2000-02-15 J&L Fiber Services, Inc. Conically tapered disc-shaped comminution element for a disc refiner
EP1002583A2 (de) * 1998-11-17 2000-05-24 H.-I. Pallmann GmbH & Co. Materialbearbeitungsmaschine mit Statorjustierung
US6238267B1 (en) 1999-05-18 2001-05-29 R & D Technology, Inc. Grinding devices for rubber comminuting machines
US6238448B1 (en) 1999-08-16 2001-05-29 R & D Technology, Inc. Grinding stones
WO2002047822A3 (en) * 2000-12-12 2002-08-15 J & L Fiber Services Inc Adjustable refiner plate
US20060231649A1 (en) * 2003-06-09 2006-10-19 Kadant Black Clawson Inc. Self-aligning and actively compensating refiner stator plate system
US8297546B2 (en) * 2009-12-01 2012-10-30 Mazzer Luigi S.R.L. Device for locking the micrometric grinding adjustment in coffee grinders
US11125486B2 (en) * 2019-05-29 2021-09-21 Haier Us Appliance Solutions, Inc. Adjustable ice crusher
WO2023170341A1 (en) * 2022-03-11 2023-09-14 Mirka Ltd Mill

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2371403C9 (ru) * 2008-03-28 2010-03-20 Общество С Ограниченной Ответственностью "Монолит" Механоактиватор цемента и способ измельчения и механической активации цемента с его использованием

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1123494A (en) * 1914-04-02 1915-01-05 Hollen W Rich Grinding-machine.
US1835984A (en) * 1930-12-02 1931-12-08 John D Haskell Refining engine
US3323731A (en) * 1963-07-01 1967-06-06 Defibrator Ab Grinding apparatus primarily for lignocellulose containing material
US3371873A (en) * 1966-03-24 1968-03-05 Keith V. Thomas Refining apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1123494A (en) * 1914-04-02 1915-01-05 Hollen W Rich Grinding-machine.
US1835984A (en) * 1930-12-02 1931-12-08 John D Haskell Refining engine
US3323731A (en) * 1963-07-01 1967-06-06 Defibrator Ab Grinding apparatus primarily for lignocellulose containing material
US3371873A (en) * 1966-03-24 1968-03-05 Keith V. Thomas Refining apparatus

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4052012A (en) * 1974-03-13 1977-10-04 Mill & Mix Company, Inc. Portable flour mill
US5398876A (en) * 1993-07-15 1995-03-21 Reinhall; Ulf B. Apparatus and method for refining pulp stock
US5564636A (en) * 1994-03-08 1996-10-15 Hawo's Kornmuhlen Gmbh Millwork for a grain mill
US6024308A (en) * 1998-11-11 2000-02-15 J&L Fiber Services, Inc. Conically tapered disc-shaped comminution element for a disc refiner
EP1002583A2 (de) * 1998-11-17 2000-05-24 H.-I. Pallmann GmbH & Co. Materialbearbeitungsmaschine mit Statorjustierung
EP1002583A3 (de) * 1998-11-17 2000-11-29 H.-I. Pallmann GmbH & Co. Materialbearbeitungsmaschine mit Statorjustierung
US6238267B1 (en) 1999-05-18 2001-05-29 R & D Technology, Inc. Grinding devices for rubber comminuting machines
US6238448B1 (en) 1999-08-16 2001-05-29 R & D Technology, Inc. Grinding stones
WO2002047822A3 (en) * 2000-12-12 2002-08-15 J & L Fiber Services Inc Adjustable refiner plate
US20060231649A1 (en) * 2003-06-09 2006-10-19 Kadant Black Clawson Inc. Self-aligning and actively compensating refiner stator plate system
US7694902B2 (en) 2003-06-09 2010-04-13 Kadant Black Clawson Inc. Self-aligning and actively compensating refiner stator plate system
US8297546B2 (en) * 2009-12-01 2012-10-30 Mazzer Luigi S.R.L. Device for locking the micrometric grinding adjustment in coffee grinders
AU2010326874B2 (en) * 2009-12-01 2016-01-07 Mazzer Luigi S.R.L. Device for locking the micrometric grinding adjustment in coffee grinders
KR101738197B1 (ko) 2009-12-01 2017-05-19 메쪼 루이지 에스.피.에이. 커피 그라인더 내에서 마이크로메트릭 그라인딩 조절을 유지하기 위한 장치
US11125486B2 (en) * 2019-05-29 2021-09-21 Haier Us Appliance Solutions, Inc. Adjustable ice crusher
WO2023170341A1 (en) * 2022-03-11 2023-09-14 Mirka Ltd Mill

Also Published As

Publication number Publication date
ATA1140669A (de) 1975-03-15
DE1959001A1 (de) 1970-12-10
YU300769A (en) 1973-06-30
NL6918587A (cs) 1970-06-23
CS166722B2 (cs) 1976-03-29
CA928545A (en) 1973-06-19
NO129918B (cs) 1974-06-10
FR2026703A1 (cs) 1970-09-18
RO54851A (cs) 1973-06-11
SE327624B (cs) 1970-08-24
BE743268A (cs) 1970-05-28
AT326985B (de) 1976-01-12
FI49336B (cs) 1975-01-31
GB1283591A (en) 1972-07-26
PL72708B1 (cs) 1974-08-30
FI49336C (fi) 1975-05-12
DE1959001B2 (de) 1976-09-23
CH502126A (de) 1971-01-31
YU31887B (en) 1973-12-31

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