US3762660A - Refiner stand - Google Patents

Refiner stand Download PDF

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Publication number
US3762660A
US3762660A US00190201A US3762660DA US3762660A US 3762660 A US3762660 A US 3762660A US 00190201 A US00190201 A US 00190201A US 3762660D A US3762660D A US 3762660DA US 3762660 A US3762660 A US 3762660A
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US
United States
Prior art keywords
stand
temperature
disks
beams
fluid
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
US00190201A
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English (en)
Inventor
J Bergstrom
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.)
SCA Projekt AB
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SCA Projekt 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 SCA Projekt AB filed Critical SCA Projekt AB
Application granted granted Critical
Publication of US3762660A publication Critical patent/US3762660A/en
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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
    • B02C7/00—Crushing or disintegrating by disc mills
    • B02C7/11—Details

Definitions

  • the [51] Int. Cl. 5c6 2/51 Stand includes (a) ducts for cimulation of a heap [58] Field of Search 241/2 5, 2 B, transfer fluid through the Stand and (b) means for 241/285 285 keeping the fluid at constant temperature.
  • the starting material for example chips is introduced through a hole in the central part of one of the disks to a space between the two disks, whereupon the material during the rotation of the disks passes radially out between the disks, whereby the material is refined under the action of dentated zones fitted all around on the disks.
  • the grinding disks are each mounted on a separate shaft driven by a motor.
  • the bearings of the shafts are mounted on a stand in the form of a bedding, which is mainly below a horizontal plane passing through the central axial line.
  • Such a construction entails considerable problems, however, in view of unfavourable deformations of the stand during the operation of the refiner, caused on the one hand by the substantial grinding forces and on the other hand caused by the great development of heat.
  • the stand is situated mainly below the horizontal plane through the axial line, that is to say the geometrical centre of gravity for a crosssection of the stand is located far below the axial line, the grinding forces will exert a deflecting effect on the stand, with the result that the parallelism of the grinding disks cannot be maintained. Since the grinding forces vary with different operating conditions, a varying angle between the grinding disks will also arise during the refining.
  • the energy which is supplied to the refiners is partly converted to heat when the material passes between the grinding disks. This heat diffuses largely through conduction and radiation into the stand.
  • the parts of the stand which are situated nearest the grind ing disks will assume. a higher temperature than the remaining parts of the stand.
  • the temperature distribution will vary in time as a function of the conditions of operation and the amount of energy that is supplied to the refiner.
  • the uneven temperature distribution results in the stand altering its shape because of temperature expansion. In the previous constructions of the stand mentioned above the temperature will be highest in the upper part of the bedding, which means that the centre of the refiner will raise itself in relation to its ends.
  • FIG. 1 shows a double-refiner
  • FIG. 2 a cross'section along 2-2 in FIG. 1
  • FIG. 3 an outline diagram of the stand
  • FIG. 4 a cross-section along 44 in FIG. 3
  • FIG. 5 the distribution of forces in the stand
  • FIG. 6 the liquid circulation in the stand seen from the side
  • FIG. 7 the liquid circulation in thelower part of the stand seen from above
  • FIG. 8 is a fragmentary diagrammatic showing of the circulating system of the stand
  • FIG. 9 is a crosssectional view, on line 9 9 of FIG. 8
  • FIG. 10 is a cross-sectional view, on line 10 10 of FIG. 8.
  • the refiner comprises a stand 1, in which are enclosed on the one hand two contra-rotating grinding disks 2,3 with corresponding shafts 4,5 and on the other hand two motors 6,7 for the driving of the shafts independently of each other.
  • the shafts 4,5 are mounted in the bearings 8 11 which are fixed in the stand 1.
  • a feeding device 12 for example a worm conveyor, is present which delivers the material to the hole 13 in the central part of the one grinding disk 3, which hole opens out into the interspace between the grinding disks 2,3.
  • the grinding disks are provided on their sides facing one another with dentated surfaces all around 14,15 in the form of a number of detachable plates which are fitted at a distance from the axial line C.
  • the other grinding disk 2 is axially movable and adjustable by means of a special device (not shown in the drawings) for the regulation of the distance between the grinding disks.
  • the stand 1 consists in principle of four trestles 16-19, each of which supporting a bearing device 8 11 for the shafts 4,5 as seen in FIG. 3. These trestles are connected to one another by means of at least six beams 20-25 largely parallel with the axial line C, so that a cross-section of the stand encloses a surface whose centre of gravity is located close to the axial line C.
  • the beams 20,21 which are arranged above the horizontal plane through the axial line C can be fitted so that they are detachable from the remaining parts of the stand, which makes possible good accessibility for work on the fixing points of the bearings.
  • the shaping of the stand the grinding forces will be distributed largely evenly over the four beams 20 23.
  • the foundations can be made relatively small. It is also possible to use a resilient setting up of the stand, by which the vibrations which are transmitted to the floor are considerably reduced.
  • the plates 34, on which the feet 35 on the stand are placed are made of a resilient material such as rubber, plastic or the like. The resilient mounting is shown in FIGS. 1, 2, 8 and 9.
  • the stand should be provided with ducts 32,33 (see FIG. 7) where liquid is circulated, without any part of the liquid remaining stagnant in the stand.
  • the liquid temperature is chosen higher than the maximum temperature which during operation in the steady state would arise in any part of the stand without liquid circulation.
  • the whole stand is made to assume the same temperature, and the deflection of the stand caused by temperature expansions caused by temperature differences in the stand, and the disadvantages associated therewith, are avoided.
  • the temperature of the stand can be maintained at stoppages so that controls or adjustments of the parallelism of the grinding disks can take place at operating temperature in psite of the disks being at standstill.
  • the liquid is heated to a preselected temperature and is kept constant at that temperature, for example by thermostatic control of the electric heater 26.
  • a pump 27 attends to the liquid circulation.
  • valves 28-31 are installed for the regulation of the liquid flow.
  • the liquid circulation need not be stopped. This is especially important when controls or adjustments of the parallelism of the grindings disks are carried out. Owing to the fact that the temperature of the stand is maintained by the circulating liquid, regardless of the development of energy at the refining, the adjustment of the disks may take place at operatng temperature in spite of the disks being at standstill.
  • the present invention is also suitable for so-called single refiners, that is to say refiners where a disk, provided with a dentated surface all around, is rotatable and workable against a fixed, similar dentated surfacev I claim:
  • Stand for a disk refiner comprising trestles for the support of bearing devices for aligned shafts which support a pair of parallel grinding disks said trestles being connected to each other by means of a number of beams,
  • ducts arranged in the stand, said ducts adapted to contain a fluid
  • the means for keeping the temperature constant includes a source of heat and a thermostat controlling said heat source to maintain the temperature of the circulating fluid at a temperature which is higher than the maximum temperature which during operation in the steady state would arise in any part of the stand without fluid circulation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Paper (AREA)
  • Crushing And Grinding (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
US00190201A 1970-11-04 1971-10-18 Refiner stand Expired - Lifetime US3762660A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE14867/70A SE351453B (fr) 1970-11-04 1970-11-04

Publications (1)

Publication Number Publication Date
US3762660A true US3762660A (en) 1973-10-02

Family

ID=20299797

Family Applications (1)

Application Number Title Priority Date Filing Date
US00190201A Expired - Lifetime US3762660A (en) 1970-11-04 1971-10-18 Refiner stand

Country Status (10)

Country Link
US (1) US3762660A (fr)
JP (1) JPS5533942B1 (fr)
AU (1) AU458401B2 (fr)
CA (1) CA950433A (fr)
ES (1) ES396577A1 (fr)
FI (1) FI53599C (fr)
FR (1) FR2113495A5 (fr)
IT (1) IT942260B (fr)
NO (1) NO129806B (fr)
SE (1) SE351453B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013081527A1 (fr) * 2011-11-30 2013-06-06 Metso Paper Sweden Ab Montant pour appareil de raffinage

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2568783A (en) * 1948-03-04 1951-09-25 Bauer Bros Co Temperature controlled mill base
US3166260A (en) * 1961-02-10 1965-01-19 Bauer Bros Co Refiner base structure
US3174695A (en) * 1962-10-05 1965-03-23 Sprout Waldron & Co Inc Attrition mill apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2568783A (en) * 1948-03-04 1951-09-25 Bauer Bros Co Temperature controlled mill base
US3166260A (en) * 1961-02-10 1965-01-19 Bauer Bros Co Refiner base structure
US3174695A (en) * 1962-10-05 1965-03-23 Sprout Waldron & Co Inc Attrition mill apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013081527A1 (fr) * 2011-11-30 2013-06-06 Metso Paper Sweden Ab Montant pour appareil de raffinage
CN103998681A (zh) * 2011-11-30 2014-08-20 维美德公司 用于精磨设备的立柱
CN103998681B (zh) * 2011-11-30 2017-03-29 维美德公司 用于精磨设备的立柱

Also Published As

Publication number Publication date
AU458401B2 (en) 1975-02-27
FR2113495A5 (fr) 1972-06-23
FI53599C (fi) 1978-06-12
JPS5533942B1 (fr) 1980-09-03
NO129806B (fr) 1974-05-27
DE2153617A1 (de) 1972-05-10
AU3487671A (en) 1973-05-03
SE351453B (fr) 1972-11-27
DE2153617B2 (de) 1976-01-08
CA950433A (en) 1974-07-02
FI53599B (fr) 1978-02-28
IT942260B (it) 1973-03-20
ES396577A1 (es) 1975-11-01

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