US3467323A - Grinding apparatus - Google Patents

Grinding apparatus Download PDF

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Publication number
US3467323A
US3467323A US489233A US3467323DA US3467323A US 3467323 A US3467323 A US 3467323A US 489233 A US489233 A US 489233A US 3467323D A US3467323D A US 3467323DA US 3467323 A US3467323 A US 3467323A
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US
United States
Prior art keywords
grinding
conveyor
disc
discs
shaft
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
US489233A
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English (en)
Inventor
Arne Johan Arthur Asplund
Johan Gunnar Inge Johansson
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.)
Valmet AB
Original Assignee
Defibrator AB
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 Defibrator AB filed Critical Defibrator AB
Application granted granted Critical
Publication of US3467323A publication Critical patent/US3467323A/en
Anticipated expiration legal-status Critical
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • D21D1/30—Disc mills
    • 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
    • B02C7/02—Crushing or disintegrating by disc mills with coaxial discs
    • B02C7/06—Crushing or disintegrating by disc mills with coaxial discs with horizontal axis

Definitions

  • a grinding apparatus for vegetable material particularly adapted for the grinding of relatively large pieces of the material including a pair of grinding discs between which the material is fed.
  • the discs are carried on shafts and at least one of the discs is rotated.
  • a conveyor is arranged concentrically around one of the shafts for feeding the material between the discs and the conveyor is rotated at a lower speed than the speed of rotation of the rotated disc.
  • This invention relates to a grinding apparatus for vegetable material, especially in relatively large pieces.
  • this invention relates to a grinding apparatus for vegetable material, especially in relatively large pieces, comprising two grinding discs rotatable in relationship to one aonther and displaceable in axial direction relatively to one another by means of a servomotor, the goods to be ground being fed between the grinding surfaces of said discs by means of a rotatable conveyor provided with entrainers.
  • the invention has primarily come into existence in connection with the development of a method according to which the vegetable material in the form of chips or other relatively large pieces is directly ground to pulp which means without being exposed to a steam atmosphere or a cooking step.
  • the grinding may in this connection be conducted in three steps of which at least the first step is carried out with a grinding apparatus according to the invention. It has proved in this connection that the feeding of the chips involves particular difficulties with conventional apparatus in particular because the chips cannot be dispersed in water and therefore show great tendency of forming plugs which has a highly obstructing effect on the grinding work.
  • One main object of the invention is to provide a grinding apparatus of the type in consideration the structure of which avoids said inconvenience.
  • the conveyor is disposed to be rotated with a substantially lower speed than the rotatable grinding disc and is located in an annular interspace surrounding the shaft of said disc.
  • the invention is especially of importance for apparatus the two grinding discs of which are carried by rotatable shafts with the conveyor concentrically enclosing one of said shafts.
  • FIG. 1 is a lateral projection of a grinding apparatus constructed according to the invention.
  • FIGS. 2 to 4 are vertical longitudinal sections through the apparatus taken subsequently one after the other so that each of them comprises one of the sections A, B and C, respectively, of FIG. 1.
  • FIG. 5 is a partially longitudinal section of a portion 3,467,323 Patented Sept. 16, 1969 of the conveyor according to a modified embodiment of the invention.
  • FIG. 6 finally is an end view of the conveyor according to FIG. 5.
  • reference numeral 10 denotes the frame of the apparatus in which two shafts 12, 14 are mounted coaxially and rotated each by its motor 16 and 18, respectively.
  • the shaft 12 is carried by a radial thrust bearing 20 and a combined radial and axial thrust bearing 22, the stationary outer rings respectively 21, 23 of said bearings in turn being located in a piston 26 of a servo-motor 24 which piston concentrically surrounds the shaft 12, but does not rotate with the same.
  • a grinding disc 28 Provided on the free end of the shaft 12 is a grinding disc 28.
  • the other shaft 14 is mounted in the frame 10* by means of a combined radial and axial thrust bearing 30 and is further supported by a radial thrust bearing 32.
  • a grinding disc 34 Secured onto the free end of the shaft 14 is a grinding disc 34 which together with the grinding disc 28 is enclosed by a base open casing 36.
  • the two grinding discs are in known manner provided with segments 38 forming against one another grinding surfaces 40.
  • the shaft 12 is axially displaceable together with the piston 26 whereas the shaft 14 is blocked in axial direction relatively to the frame by the bearing 30.
  • the piston 26 of the servo-motor is on its outside provided with an annular flange 42 and is with sealing sliding fit axially movable within a chamber 44 formed in the stationary housing 46 of the servo-motor.
  • the chamber 44 has at its both ends inlets and outlets 48, 50 for a liquid under pressure such as oil.
  • pressure medium is supplied through the conduit 48 the piston 26 is displaced in right hand direction in the figures under which displacement it carries along the shaft 12 through the axial thrust bearing 22, the grinding disc 28 mounted on said shaft thereunder being carried in a direction towards the grinding disc 34 so as to cause the goods to be ground passing therebetween to be exposed to predetermined grinding pressure.
  • the two grinding discs 28 and 34 rotate in mutually opposite directions.
  • the grinding disc 28 By connecting the conduits 48, 50 to a pressure source and a drain, respectively, the grinding disc 28 can be displaced in a direction towards, and away of, the grinding disc 34, and further the grinding pressure and therewith the magnitude of the grinding interspace can be varied within suitable limits.
  • the members necessary for this op eration have not been shown because they have no connection with the invention and are known per se.
  • the axially stationary shaft 14 is with play enclosed by a sleeve-shaped conveyor 52 adjacent the grinding disc 34.
  • the hub 54 of said disc and the disc portion 56 carrying the grinding segments are suitably staggered axially relatively to one another so that the end portion of the conveyor 52 is located radially inside the disc portion 56.
  • the conveyor 52 may have slightly tapering diameter in the direction towards the grinding disc.
  • the casing 36 has on its top side an opening 58 for feeding in of the goods to be ground such as the chips, through a hopper 60 (FIG. 1).
  • the conveyor 52 is in the embodiment according to FIGS. 1-4 on its outside provided with a helical entrainer 62 which projects from the opening 56 under the outer portion of the grinding disc 34.
  • the disc 34 is between its portions 54 and 56 formed with a minor number of spokes 64 in the form of inclined shovels or the like which serve as entrainers for the goods to be ground through the disc to the interspace between the grinding surfaces of the grinding disc.
  • the hub 54 is provided with several projections or teeth 53 spaced over the circumference and having for its object to facilitate the feeding of the goods from the conveyor 52 to the passages formed in the disc 34.
  • the conveyor 52 has an end portion 66 with slightly greater diameter which on its inner side is slidably mounted on a bracket 68 which is rigidly secured onto the frame 10. Fixed on the external side of the end portion 66 is a toothing rim 70 which through a chain 72 is in driving connection with a toothing rim 73 mounted on a motor 74 which suitably is located in the base part of the frame 10 and the number of revolutions of which is variable. In this way the conveyor 52 can be driven separately with a substantially lower speed than the shafts 12 and 14, respectively. Whereas thus the number of revolutions of the conveyor may be of the order of magnitude of 60 revolutions per minute the shafts are rotated with a speed of the order of magnitude of 1,500 revolutions per minute.
  • stufiing boxes 76, 78 of known kind are provided on both sides of the casing 36 and the conveyor 52 stufiing boxes 76, 78 of known kind are provided.
  • the box 78 is located radially within the end portion 66 of the conveyor.
  • the material may be grounded further in at least two steps so as gradually to reach the final condition with separation of fibres and fibre bundles and possibly fibrillation of the individual fibres.
  • the second step also may be effected in a grinding apparatus of the kind described hereinbefore. Alternately for this and also the last grinding step conventional grinding apparatus may be used.
  • the pulp may then be introduced into the apparatus in the form of a liquid suspensron.
  • FIGS. 5 and 6 differs from the preceding one by the helical entrainer 62 of the conveyor 52 terminating at a distance from the outlet side of the conveyor where instead inclined vanes 80 are dis posed spaced around the circumference. These vanes serve to advance the chips in a direction to the interspace between the grinding discs.
  • the grinding operation in the apparatus of the invention may be combined with steam treatment of the vegetable material in any of the treatment steps.
  • the casing 36 may be closed entirely so that a superatmospheric pressure of fluid or vapor may be maintained therein.
  • a grinding apparatus for vegetable material particularly in relatively large pieces, comprising two grinding discs mounted on shafts and rotatable in relationship to one another and displaceable in axial direction relatively to one another by means of a servo-motor, the goods to be ground being fed between the grinding surfaces of said grinding discs, a rotatable conveyor for feeding the goods between the grinding discs, said conveyor being provided with entrainers, the conveyor adapted to rotate at a substantially lower speed than the rotatable grinding disc and being located in an annular interspace surrounding the shaft of said disc.
  • both grinding discs are carried by rotatable shafts, the conveyor concentrically surrounding one of said shafts.
  • a grinding apparatus for vegetable material comprising, a pair of grinding discs, each of said discs being borne by a shaft, at least one of the shafts and its disc being rotated, the goods to be ground being fed between the grinding surfaces of the grinding discs, a rotatable conveyor for feeding the goods between the discs, said conveyor being provided with entrainers, said conveyor surrounding one of the shafts and in concentric disposition thereto, and said conveyor adapted to rotate at a lower speed than the speed of rotation of the rotatable grinding disc.
  • a grinding apparatus for vegetable material comprising, a pair of grinding discs, at least one of said discs being rotated, said rotating disc being carried by a shaft, the goods to be ground being fed between the grinding surfaces of the grinding discs, a rotatable conveyor for feeding the goods between the discs, said conveyor being provided with entrainers, said conveyor surrounding said shaft and in concentric disposition thereto, and said conveyor adapted to rotate at an essentially lower speed than the speed of rotation of the rotatable grinding disc.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Crushing And Grinding (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
US489233A 1964-09-25 1965-09-22 Grinding apparatus Expired - Lifetime US3467323A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE11571/64A SE307288B (de) 1964-09-25 1964-09-25

Publications (1)

Publication Number Publication Date
US3467323A true US3467323A (en) 1969-09-16

Family

ID=20294203

Family Applications (1)

Application Number Title Priority Date Filing Date
US489233A Expired - Lifetime US3467323A (en) 1964-09-25 1965-09-22 Grinding apparatus

Country Status (9)

Country Link
US (1) US3467323A (de)
AT (1) AT281580B (de)
BE (1) BE669974A (de)
CH (1) CH430394A (de)
DE (1) DE1461014A1 (de)
FI (1) FI45874C (de)
GB (1) GB1047367A (de)
NL (1) NL6512419A (de)
SE (1) SE307288B (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3845909A (en) * 1972-05-10 1974-11-05 I Johansson Grinding apparatus for vegetable materials
JPS52128664A (en) * 1976-04-20 1977-10-28 Toshio Yagi Garvage disposing device
JPS52128663A (en) * 1976-04-20 1977-10-28 Toshio Yagi Vertical garbage disposing device
US5167373A (en) * 1991-01-08 1992-12-01 Abb Sprout-Bauer, Inc. Controlled intensity high speed double disc refiner
DE102020105875A1 (de) 2020-03-05 2021-09-09 Voith Patent Gmbh Faserbehandlungsvorrichtung

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE419659B (sv) * 1976-03-19 1981-08-17 Rolf Bertil Reinhall Sett och anordning for framstellning av fibermassa av fiberformigt lignocellulosahaltigt material
SE419877B (sv) * 1978-01-24 1981-08-31 Defibrator Ab Anordning vid malapparater for lignocellulosahaltigt material
US4223847A (en) * 1978-11-01 1980-09-23 The Bauer Bros. Co. Coaxial feeder

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US976535A (en) * 1909-08-16 1910-11-22 John C Woodcock Feed-mill.
US1123494A (en) * 1914-04-02 1915-01-05 Hollen W Rich Grinding-machine.
US2751157A (en) * 1952-04-12 1956-06-19 Gutehoffnungshuette Oberhausen Grinding mill embodying coaxial oppositely rotating grinding disks
US3092338A (en) * 1959-04-16 1963-06-04 Defibrator Ab Pulp refining apparatus
US3215355A (en) * 1963-02-27 1965-11-02 Bauer Bros Co Feed means for a refiner
US3302893A (en) * 1964-02-18 1967-02-07 Wedco Disc mill

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US976535A (en) * 1909-08-16 1910-11-22 John C Woodcock Feed-mill.
US1123494A (en) * 1914-04-02 1915-01-05 Hollen W Rich Grinding-machine.
US2751157A (en) * 1952-04-12 1956-06-19 Gutehoffnungshuette Oberhausen Grinding mill embodying coaxial oppositely rotating grinding disks
US3092338A (en) * 1959-04-16 1963-06-04 Defibrator Ab Pulp refining apparatus
US3215355A (en) * 1963-02-27 1965-11-02 Bauer Bros Co Feed means for a refiner
US3302893A (en) * 1964-02-18 1967-02-07 Wedco Disc mill

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3845909A (en) * 1972-05-10 1974-11-05 I Johansson Grinding apparatus for vegetable materials
JPS52128664A (en) * 1976-04-20 1977-10-28 Toshio Yagi Garvage disposing device
JPS52128663A (en) * 1976-04-20 1977-10-28 Toshio Yagi Vertical garbage disposing device
JPS5528733B2 (de) * 1976-04-20 1980-07-30
JPS5528734B2 (de) * 1976-04-20 1980-07-30
US5167373A (en) * 1991-01-08 1992-12-01 Abb Sprout-Bauer, Inc. Controlled intensity high speed double disc refiner
DE102020105875A1 (de) 2020-03-05 2021-09-09 Voith Patent Gmbh Faserbehandlungsvorrichtung
CN115315316A (zh) * 2020-03-05 2022-11-08 福伊特专利有限公司 纤维处理装置

Also Published As

Publication number Publication date
SE307288B (de) 1968-12-23
GB1047367A (de)
FI45874B (de) 1972-06-30
DE1461014A1 (de) 1968-12-19
NL6512419A (de) 1966-03-28
BE669974A (de) 1966-01-17
FI45874C (fi) 1972-10-10
CH430394A (de) 1967-02-15
AT281580B (de) 1970-05-25

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