US3323731A - Grinding apparatus primarily for lignocellulose containing material - Google Patents

Grinding apparatus primarily for lignocellulose containing material Download PDF

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Publication number
US3323731A
US3323731A US376779A US37677964A US3323731A US 3323731 A US3323731 A US 3323731A US 376779 A US376779 A US 376779A US 37677964 A US37677964 A US 37677964A US 3323731 A US3323731 A US 3323731A
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US
United States
Prior art keywords
grinding
discs
shaft
piston
casing
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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
US376779A
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English (en)
Inventor
Asplund Arne Johan Arthur
Reinhall Rolf Bertil
Johansson Johan Gunnar Inge
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
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Defibrator AB
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Publication date
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Publication of US3323731A publication Critical patent/US3323731A/en
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    • 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
    • D21D1/303—Double 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
    • 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
    • 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

Definitions

  • this invention relates to a grinding apparatus, primarily intended for lignocellulose containing material and provided with two rotatable grinding dis-cs disposed within a casing and each co-operating with a stationary grinding disc, inlet and discharge channels for the material to be treated being provided in the casing for each pair of co-operating grinding discs.
  • a grinding apparatus of this type can be given the double capacity compared with that of an apparatus with one pair only of co-operating grinding discs.
  • One main object of the invention is to provide an improvement of this type of grinding apparatus, denominated also as double grinders so as to permit to adjust the two pairs of grinding discs to the same or different grinding pressures irrespective of whether the channels or the paths of flow pertaining to them are coupled in parallel or in series. 7
  • a further object of the invention is to provide an improvement of the grinding apparatus in consideration, which renders possible an adjustment of the grinding pressure between the two pairs of grinding discs from a position where only one pair is in operation to a position where both pairs are loaded equally, and to all conceivable intermediate positions between said limits.
  • FIG. 1 is a vertical longitudinal section through a grinding apparatus constructed according to the invention.
  • FIG. 2 is a sectional view of the central part of the apparatus with the paths of flow pertaining to the pairs of grinding discs coupled in parallel to one another.
  • FIG. 3 is the same sectional view but with the paths of flow disposed in series.
  • reference numeral denotes a stationary base structure of the apparatus to which horizontally divided casings or housings 11, 12 and 13, 14 respectively, are connected.
  • a shaft 16 passes through the casings and is at its one end mounted in a bearing 18 which preferably is of anti-friction or roller type and which is capable of absorbing beside radial thrust, also axial thrust in both directions.
  • the two casings are separated from one another by a part 20 of the base structure 10, which on either side supports a stationary grinding disc 22, 24, respectively.
  • Rigidly secured to the shaft 16 is a grinding disc 26 rotating with said shaft and which together with the stationary disc 22 forms a grinding interspace 28, through which the material to be disintegrated therein is passed in an upward direction.
  • the shaft 16 on the opposite side of the casings 11, 12 and 13, 14, viewed from the bearing 18, is concentrically surrounded by a tubular shaft 30 which is slidably supported by a radial thrust bearing 39, preferably a spherical roller bearing. Disposed between the shafts 16 and 30 are splines 34 so that said shafts are axially displaceable relatively to one another but rotate together, the outer shaft through a coupling 36 being connected to a driving motor (not shown).
  • the shaft 30 carries a grind- Patented June 6, 1967 ing disc 38 rigidly anchored thereon and co-operating with the stationary grinding disc 24, a grinding interspace 40 being formed therebetween and through which the material to be treated is passed in a radial outward direction whereby this material becomes finely divided or disintegrated.
  • the material to be ground is supplied to the pairs of grinding discs 22, 26 through a channel 42 which may extend in the base part 20 to a central space 44 adjacent the inner faces of said grinding discs.
  • the pulp ground between them is discharged through a channel 46.
  • the other pair of grinding discs 24, 38 has a supply channel 48 in the base part 20 which opens into a space 50 formed centrally inside said grinding discs.
  • the pulp ground between said discs is discharged through a channel 52.
  • the channels 46, 52 are located in the casings '1-1, 12 and 13, 14 enclosing the grinding discs.
  • a ring member 54 formed with a cylindric external face which is axially slidable on a corresponding formed face of a casing 56 rigidly secured onto the base structure 10.
  • a disc 58 Connected to the ring member '54 is a disc 58 and to the latter a servo-motor piston 60 which has an outer annular flange 62 adapted to be displaced axially Within a prolongation 64 of the casing 56.
  • a chamber 66, 68 respectively adapted to be connected to a pressure source or an outlet in a manner to be described later more in detail.
  • the supply of pressure fluid to the servo-motor 60, 64 is controlled by a pilot valve generally denoted and of the type known per se as is disclosed, for instance, by the patent specification No. 2,997,704.
  • the pilot valve 30 is rigidly connected with the prolongation 64 of the casing 56 of the servo-motor 60, 62.
  • the pilot valve includes a piston or valve body 82 formed with a central flange S3 and two lateral flanges 84, 85.
  • the pilot valve 80 has a central chamber 86 and two lateral chambers 87, 88. Between the two lateral chambers 87, 88 and the central chamber 86, the inner diameter of the valve housing is reduced to correspond to the external diameter of the flanges.
  • the flange 83 has an axial dimension which, by a small unit of measure, such as of one hundredth or a few hundredths of one millimetre, is shorter than the length of the chamber 86. In the same manner the flanges '84, have an axial dimension which is only slightly less than the length of the chambers 87, 88. In the middle position all flanges are positioned right in front of their pertaining chambers.
  • a pipe 89 connects the central chamber 86 of the pilot valve with an oil sump 90, a pump 91 being provided in this pipe and a spring-loaded valve 93 in a return pipe 92 connected to said pipe 89.
  • a pipe 95 extends to the chamber 68 on one side of the flange 62 of the servomotor.
  • a pipe 96 connects a space 97 with the same reduced diameter of the pilot valve located on the other side of the central chamber 86 with the chamber 66 on the opposite side of the flange 62.
  • a return pipe 98 the lateral chambers 87, 88 are in open connection with the sump 90.
  • An adjustment screw 100 is passed through a threaded passage in an arm 99 fixed to the servo-motor piston 64 said adjustment screw being coaxial with the valve body 82 of the pilot valve and adapted to act on the facing end of said valve body projecting from the valve casing.
  • the other end of the valve body 82 is under the load of a spring member 101 tending always to keep the valve body pressed against the adjustment screw 160.
  • Another pilot valve 102 has for its object to control the supply of pressure fluid to the servo-motor 70, 72.
  • This pilot valve is of the same construction as the pilot valve 80.
  • FIG. 1 the same reference numerals have been used for both servo-motors with the addition of a sufiix for the pilot valve 102.
  • the casing thereof is fixed in the base structure 10.
  • the arm 104 carrying the adjustment screw 100 is fixed in a ring member 106 surrounding the nonrotating part of the bearing32.
  • the ring member 106 is axially displaceable within a surrounding stationary outer casing 180 and due to this feature follows the shaft 30 in the axial movements thereof.
  • the grinding apparatus may be adjusted so that the both pairs of grinding discs 22, 26 and 24, 38, respectively, operate in parallel with two fractions of pulp or material to be ground.
  • the one fraction or stream of pulp is introduced through the channel 42 and the chamber 44, and passes radially outwards between the grinding discs 22, 26 while a disintegration of fibre bundles or fibres is effected.
  • the ground pulp is discharged through the outlet 46.
  • the other fraction or stream of pulp passes through the channel 48, the chamber 50, and the interspace between the discs 24 and 38 and is discharged through the outlet 52.
  • the quality of the material to be treated may be dilferent prior to and/ or after the grinding operation depending on the conditions.
  • Disposed inthe inlet and outlet channels may be locking and/ or controlling or regulating valves 120, 122, 124 and 126.
  • the two pairs of grinding discs may also operate in series which means that they may be passed by the same stream of material to be treated in the apparatus.
  • the channel 46 is connected with the supply channel 48 by means of a connecting pipe branch or coupling 128, the valve 124 and possibly also the valve 122 being dispensed with.
  • the pilot piston 82 is moved in the same direction. The result will be that pressure fluid is forced from the pump 98 through the chambers 86, 94 to the chamber 68 of the servomotor 60, 64. The shaft 16 moves'nowto the left so that a metallic contact between the grinding discs is avoided.
  • pilot piston 82 follows'the axial movements of the shaft 130 through intersection of the arm 104, the ring member .106 and the bearing 32. At the displacement of thejshaft A 30 and together therewith the piston 82 to the right, a
  • a grinding apparatus primarily intended for lignocellulose containing material and provided with two rotatable grinding discs disposed within a casing and each cooperating with a stationary grinding disc, inlet and discharge channels for the 'material being provided in the casing for each pair of co-operating grinding discs. anda.
  • each of the rotating discs is supported by a shaft of which shafts one is positioned concentrically around the other shaft and which shafts both are displaceable axially under 7 the action of pressure fluid actuated servo-motors.
  • the grinding apparatus as claimed in claim 1 characterized in that the casings are formed for application of the channels in parallel relation to, or by attachment of a socket, in a series with one another.
  • a grinding apparatus primarily intended for lignocellulose containing material and provided with two rotatable grinding discs disposed within a casing and each cooperating with a stationary grinding disc, inlet and discharge channels for the material being provided in the casing for each pair of cooperating grinding discs, a base structure for said apparatus; characterized in that the said rotatable discs are supported by separate shafts, one of said shafts being positioned concentrically around the other shaft, said shafts being rotatable in one and the same direction, and being displaceable axially under the action of two servo-motors, one of said servo-motors being adapted to actuate both rotatable grinding discs simultaneously and in opposite directions, the other servo-motor being adapted to actuate only one of said grinding discs.
  • a grinding apparatus as claimed in claim 6, char acterized in that one of the servo-motors has a piston carried by one of the shafts and a casing carried by the other shaft in which casing the piston is axially displaceable and into which conduits open for supply of pressure fluid to either side of the piston, said first mentioned shaft being at its opposite end, through an axial thrust bearing which is mounted axilaly movable in the base structure, connected with the piston of the other servo-motor, the casing of which is fixed to the base structure and has conduits opening on either side of the last-mentioned piston for supply of pressure fluid to both sides of the piston.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Electrolytic Production Of Metals (AREA)
US376779A 1963-07-01 1964-06-22 Grinding apparatus primarily for lignocellulose containing material Expired - Lifetime US3323731A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE730363 1963-07-01

Publications (1)

Publication Number Publication Date
US3323731A true US3323731A (en) 1967-06-06

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ID=20270992

Family Applications (1)

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US376779A Expired - Lifetime US3323731A (en) 1963-07-01 1964-06-22 Grinding apparatus primarily for lignocellulose containing material

Country Status (9)

Country Link
US (1) US3323731A (cs)
AT (1) AT272063B (cs)
BE (1) BE649929A (cs)
CH (1) CH418811A (cs)
DE (1) DE1257005C2 (cs)
FI (1) FI41097C (cs)
GB (1) GB1066226A (cs)
NL (1) NL6407500A (cs)
NO (1) NO126748B (cs)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3448934A (en) * 1966-08-12 1969-06-10 Frank C Vaughan Refining apparatus
US3684200A (en) * 1968-12-20 1972-08-15 Rolf Bertil Reinhall Grinding apparatus
US3754714A (en) * 1971-09-24 1973-08-28 Reinhall Rolf Grinding apparatus especially for lignocellulose containing material
US3845910A (en) * 1972-10-10 1974-11-05 Bolton Emerson Inlets for a double disc refiner
US3977611A (en) * 1974-03-27 1976-08-31 Sca Development Aktiebolag Apparatus for refining fiber material
US4447011A (en) * 1979-11-05 1984-05-08 Koppers Company, Inc. Plate adjustment system
WO1986001434A1 (en) * 1984-09-05 1986-03-13 Sunds Defibrator Aktiebolag Combined hydrostatic/hydrodynamic bearing system for grinding apparatus
US4700900A (en) * 1983-10-24 1987-10-20 Hymac Ltd. Two stage refiner
US5076892A (en) * 1989-07-20 1991-12-31 Sprout-Bauer Inc. Apparatus for pressurized refining of lignocellulose material
US5445328A (en) * 1993-08-25 1995-08-29 Andritz Sprout-Bauer, Inc. Dual zone refiner with separated discharge flow control
US20070181723A1 (en) * 2003-12-19 2007-08-09 Karlheinz Herbold Disc mill
CN102400406A (zh) * 2011-11-09 2012-04-04 华南理工大学 中浓液压双盘磨浆机
CN111373091A (zh) * 2017-11-24 2020-07-03 福伊特专利有限公司 研磨设备
US20230047528A1 (en) * 2020-04-01 2023-02-16 Andritz Ag Apparatus for Grinding a Fibrous Material Suspension

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2743874A (en) * 1952-07-19 1956-05-01 Asplund Arne Johan Arthur Disk type grinding apparatus for fibrous materials
US2864562A (en) * 1953-05-20 1958-12-16 Bauer Bros Co Plural stage disc mill with back pressure control means for each stage
US2982482A (en) * 1960-06-01 1961-05-02 Ed Jones Corp Double-disk refiner

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR907792A (fr) * 1944-05-11 1946-03-21 Molinor S A Broyeurs à disques inversés et commande par couples coniques pour mouture ou pulvérisation de matières diverses
FR1059334A (fr) * 1951-07-21 1954-03-24 Broyeur pour matières fibreuses
FR1318808A (fr) * 1962-01-12 1963-02-22 Sprout Waldron & Company Broyeur à disques travaillant par frottement
FR1328216A (fr) * 1962-07-09 1963-05-24 Sprout Waldron & Company Appareil de broyage

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2743874A (en) * 1952-07-19 1956-05-01 Asplund Arne Johan Arthur Disk type grinding apparatus for fibrous materials
US2864562A (en) * 1953-05-20 1958-12-16 Bauer Bros Co Plural stage disc mill with back pressure control means for each stage
US2982482A (en) * 1960-06-01 1961-05-02 Ed Jones Corp Double-disk refiner

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3448934A (en) * 1966-08-12 1969-06-10 Frank C Vaughan Refining apparatus
US3684200A (en) * 1968-12-20 1972-08-15 Rolf Bertil Reinhall Grinding apparatus
US3754714A (en) * 1971-09-24 1973-08-28 Reinhall Rolf Grinding apparatus especially for lignocellulose containing material
US3845910A (en) * 1972-10-10 1974-11-05 Bolton Emerson Inlets for a double disc refiner
US3977611A (en) * 1974-03-27 1976-08-31 Sca Development Aktiebolag Apparatus for refining fiber material
US4447011A (en) * 1979-11-05 1984-05-08 Koppers Company, Inc. Plate adjustment system
US4700900A (en) * 1983-10-24 1987-10-20 Hymac Ltd. Two stage refiner
WO1986001434A1 (en) * 1984-09-05 1986-03-13 Sunds Defibrator Aktiebolag Combined hydrostatic/hydrodynamic bearing system for grinding apparatus
US5076892A (en) * 1989-07-20 1991-12-31 Sprout-Bauer Inc. Apparatus for pressurized refining of lignocellulose material
US5445328A (en) * 1993-08-25 1995-08-29 Andritz Sprout-Bauer, Inc. Dual zone refiner with separated discharge flow control
US20070181723A1 (en) * 2003-12-19 2007-08-09 Karlheinz Herbold Disc mill
CN102400406A (zh) * 2011-11-09 2012-04-04 华南理工大学 中浓液压双盘磨浆机
CN102400406B (zh) * 2011-11-09 2014-02-26 华南理工大学 中浓液压双盘磨浆机
CN111373091A (zh) * 2017-11-24 2020-07-03 福伊特专利有限公司 研磨设备
US20230047528A1 (en) * 2020-04-01 2023-02-16 Andritz Ag Apparatus for Grinding a Fibrous Material Suspension
US12188177B2 (en) * 2020-04-01 2025-01-07 Andritz Ag Apparatus for grinding a fibrous material suspension

Also Published As

Publication number Publication date
CH418811A (de) 1966-08-15
GB1066226A (en) 1967-04-26
BE649929A (cs) 1964-12-30
NL6407500A (cs) 1965-01-04
AT272063B (de) 1969-06-25
DE1257005C2 (de) 1968-08-14
NO126748B (cs) 1973-03-19
DE1257005B (de) 1967-12-21
FI41097B (cs) 1969-04-30
FI41097C (fi) 1969-08-11

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