US3848814A - Pulp grinder - Google Patents

Pulp grinder Download PDF

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Publication number
US3848814A
US3848814A US00283230A US28323072A US3848814A US 3848814 A US3848814 A US 3848814A US 00283230 A US00283230 A US 00283230A US 28323072 A US28323072 A US 28323072A US 3848814 A US3848814 A US 3848814A
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US
United States
Prior art keywords
pin
pulp
grinder
blade disk
rotating blade
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
US00283230A
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English (en)
Inventor
A Syrjanen
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.)
Yhtyneet Paperitehtaat Oy
Original Assignee
Yhtyneet Paperitehtaat Oy
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Filing date
Publication date
Application filed by Yhtyneet Paperitehtaat Oy filed Critical Yhtyneet Paperitehtaat Oy
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Publication of US3848814A publication Critical patent/US3848814A/en
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Expired - Lifetime legal-status Critical Current

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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
    • B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
    • B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
    • B02C18/16—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
    • B02C7/00—Crushing or disintegrating by disc mills
    • B02C7/11—Details
    • B02C7/14—Adjusting, applying pressure to, or controlling distance between, discs

Definitions

  • the quality of the ground pulp is decisively influenced not only by the width of the grinding gap but also by the accuracy with which the grinding surfaces are parallel.
  • certain parts of the body structure of the grinder warm up, causing thermal expansion and as the result of this, an error in the parallel alignment.
  • the quality of the pulp deteriorates.
  • Even an error as small as 0.05 mm in the parallel alignment of the grinding surfaces has to be corrected.
  • the pulp grinder is stopped after it has reached operating temperature and an impairment of the pulp quality due to thermal stresses has been noticed. Subsequently, the grinding gaps have been adjusted with the aid of one or several fixing pins to be parallel once again.
  • the aim of the present invention is to eliminate this drawback and to provide a pulp grinder wherein the adjustment can be made during operation of the grinder.
  • the invention is characterized in that at least one fixing pin is heatable, and thereby adjustable in its length, for instance by the aid of electric current, of a temperature-controlled medium or of vibration. These modes of producing and transferring heat may all be applied for changing the length of one fixing pin, or regulating pin.
  • At least one fixing pin or regulating pin is heatable by the aid of an electrical resistor placed in a cavity within it.
  • an electrical resistor placed in a cavity within it.
  • the regulating pin itself is an electrical resistor. It is also possible to place within the pin an induction coil, by means of which the temperature may be raised.
  • Heat may be introduced along with a fluid.
  • ducts are provided in the regulating pin in which a circulation of temperature-controlled liquid or gas is arranged. In this case it is advantageous that it is also possible to cool the pin.
  • Heat transfer may also be by conduction with the aid of a solid, thermally well conductive substance.
  • the regulating pin may be heated by the aid of vibration, such as ultrasound.
  • FIG. 1 represents, schematically, a disk grinder with one blade gap, in section carried along the line I--I in FIG. 2,
  • FIG. 2 shows the section along the line llll in FIG.
  • FIG. 3 is a more detailed longitudinal section of the pulp grinder, along the line lII-IIl in FIG. 4,
  • FIG. 4 shows the pulp grinder of FIG. 3, sectioned along the line IVIV in FIG. 3, and
  • FIG. 5 is the regulating pin in the upper part of FIG. 3, on a larger scale and longitudinally sectioned.
  • the angle a illustrates the angle between the non-rotating blade disk 1 and the rotating blade disk 2, which is the deviation from parallel alignment due to bending of the grinder body 13.
  • the bending of the body 13, again, is caused by the fact that the pulp grinder reaches, after it has been started, its operating temperature.
  • this error deviation may be corrected by changing the length of the regulating pin 4 during operation, by the aid of a heater resistor.
  • FIG. 2 shows the location of the regulating pin 4 and those of the fixing pins 5 and 6 in the fixing arrangement of the nonrotating blade disk.
  • the opening seen in the centre is the pulp feed aperture 7.
  • FIGS. 3 and 4 show the design of the pulp grinder in greater detail.
  • the surfaces of the blade disks 1 and 2 facing each other have been provided with blades 9, whereby the grinding surfaces 10 and 11 and the grinding gap 8 between them are formed.
  • the non-rotating blade disk 1 has een provided with a reinforcing ring 12, to which one end of the fixing pins 4, 5 and 6 has been attached. The opposite ends of the pins have been attached to the body 13 of the grinder.
  • the rotating blade disk has been mounted by means of a flange 14 on the shaft 15, which is rotated by a drive motor (not depicted).
  • Within the feed aperture 7 there is a feed screw 16, which supplies pulp into the grinding gap 8 between the blades 9 of the blade disks 1 and 2, whence the pulp moves under effect of centrifugal force to the outer periphery and further to the exit port 17.
  • FIG. 5 the design of the regulating pin 4 has been shown in greater detail.
  • the end 18 of the regulating pin 4 adjacent to the blade disk has been attached by thread to the reinforcing ring 12 of the non-rotating blade disk 1.
  • the opposite end of the regulating pin 4, indicated by reference numeral 19, has been attached to the body 13 by means of a shoulder 20 on the pin and a nut 21. Heat transfer from the pin 4 to the body 13 has been prevented by means of insulators 22.
  • Within the regulating pin 4 there is a concentric hollow cavity 23, containing a resistance 24, and a duct 25 intended for the leads of the electrical resistance carries out from the cavity 23.
  • the duct 25 is thermally insulated against the body of the pin 4 by the insulation 26.
  • the end 19 of the pin 4 attached to the body has been provided with a nut end 27 and a packing 28.
  • the blade disks 1 and 2 Prior to starting the grinder, the blade disks 1 and 2 are adjusted to be exactly parallel. After the grinder has reached its operating temperature, 3 to 4 hours after starting, the body has been bent to such degree that the rotating blade disk 2 is no longer parallel with the nonrotating blade disk 1. In the exemplary case, the distance between the blade disks becomes larger at their upper margin than at the lower margin. The difference in the distances may be on the order of 0.15 mm.
  • the disks are then adjusted to be parallel, during operation, by increasing the current passing through the resistance 24 within the regulating pin 4, whereby the pin 4 is warmed and lengthens, pushing the non-rotating blade disk 1 at its upper edge toward the rotating blade disk 2 until the blade disks are parallel. Parallel-relationship may be observed by measuring the distances between the blade disks at the top and bottom or by observing the quality of the pulp. When the pulp presents a good quality, the blade disks are parallel.
  • the distance between the blade disks may become larger at the bottom than at the top.
  • the pins 5 and 6 below the axis may be arranged to be regulating pins, or two fixing pins may be provided above the axis and one regulating pin under the axis in the vertical plane passing through the axis.
  • adjustment may also be accomplished in this case by means of an arrangement as in the example. It is possible to make such arrangements that an electric current already flows through the resistance 24 when the pulp grinder is started and that the temperature of the regulating pin 4 is such that it can be lowered by reducing the current.
  • a regulating range of the regulating pin temperature of :50C suffices for parallel adjustment of the blade disks in both cases in question.
  • a further advantage of the device according to the invention is that by its aid the parallel alignment control of the blade disks can be easily automated, whereby the blade disks will at all times be parallel, independent of the temperature of the pulp grinder.
  • the fixing pin may be made to receive interiorly thereof a temperature controlled heating fluid so as to adjust the heat and length of the pin.
  • the pin may be heated through imparting vibration thereto by a suitable device such as, for example, an ultrasonic vibrator (not shown).
  • the number of blade disks and grinding gaps may vary, and introduction of the pulp may be in a manner different from that described in the exemplary case.
  • the shape, and the attachments and insulations, of the fixing and regulating pins may also be of another kind.
  • the regulating pin need not either necessarily to be located above the axis; it may also lie under the axis in a vertical plane passing through the axis.
  • Improvement in a pulp grinder for cellulose, paper or other equivalent pulp comprising at least one non-rotating blade disk and at least one rotating blade disk which have grinding surfaces facing each other, the non-rotating blade disk being secured to the body of the grinder by means of three fixing pins, said fixing pins being adapted to contact the non-rotating blade disk and deflect the latter so that the grinding surfaces are adjustable to be parallel, wherein the improvement comprises in that at least one fixing pin includes means for heating said pin so as to be variable in length.
  • Pulp grinder as claimed in claim 1, said fixing pin being hollow, and said means for heating said pin comprising an electrical resistor located within said hollow pin.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Paper (AREA)
US00283230A 1971-08-27 1972-08-23 Pulp grinder Expired - Lifetime US3848814A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI712397A FI49194C (fi) 1971-08-27 1971-08-27 Massanjauhin

Publications (1)

Publication Number Publication Date
US3848814A true US3848814A (en) 1974-11-19

Family

ID=8507045

Family Applications (1)

Application Number Title Priority Date Filing Date
US00283230A Expired - Lifetime US3848814A (en) 1971-08-27 1972-08-23 Pulp grinder

Country Status (7)

Country Link
US (1) US3848814A (enExample)
JP (1) JPS4833104A (enExample)
CA (1) CA962494A (enExample)
DE (1) DE2239119A1 (enExample)
FI (1) FI49194C (enExample)
FR (1) FR2151889A5 (enExample)
GB (1) GB1365204A (enExample)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4426897A (en) 1981-07-13 1984-01-24 Littleton Francis J Thermal adjustment method and apparatus for rotating machines
US4527473A (en) * 1981-07-13 1985-07-09 Littleton Francis J Thermal adjustment apparatus for rotating machines
US4674689A (en) * 1980-11-19 1987-06-23 Ranks Hovis Mcdougall Ltd. Milling machines
US4820980A (en) * 1987-05-04 1989-04-11 Dodson Edgars Darryl Gap, wear and tram measurement system and method for grinding machines
US5544819A (en) * 1993-06-11 1996-08-13 The Haigh Engineering Company Ltd. Rotary disintegrators
US6657427B2 (en) * 2000-03-23 2003-12-02 D/A Production Ab Method and device for measuring a distance between a stator and a rotor
US20040169506A1 (en) * 2001-09-26 2004-09-02 Bengt Akerblom Transducer for distance measurement
WO2007094711A1 (en) * 2006-01-16 2007-08-23 Metso Paper Inc. A method and a device for controlling the alignment between refining surfaces
CN108301246A (zh) * 2017-12-31 2018-07-20 东莞市泰昌纸业有限公司 在使用废纸造纸的磨浆过程中降低长纤维折断率的方法
CN110055791A (zh) * 2019-04-17 2019-07-26 南宁学院 实验室超声废纸脱墨设备

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2499115A1 (fr) * 1981-02-02 1982-08-06 Chleq Frote Cie Raffineur de pate a papier a puissance reglable

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2548599A (en) * 1948-11-02 1951-04-10 Gen Electric Clearance control
US2947485A (en) * 1954-02-05 1960-08-02 Bauer Bros Co Disc refiner
US2971704A (en) * 1955-11-07 1961-02-14 Asplund Arne J A Grinding apparatus for disintegrating fibrous material
AT222474B (de) * 1959-12-28 1962-07-25 Josef Richter Zerkleinerungsmaschine für Futtermittel
US3302893A (en) * 1964-02-18 1967-02-07 Wedco Disc mill

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2548599A (en) * 1948-11-02 1951-04-10 Gen Electric Clearance control
US2947485A (en) * 1954-02-05 1960-08-02 Bauer Bros Co Disc refiner
US2971704A (en) * 1955-11-07 1961-02-14 Asplund Arne J A Grinding apparatus for disintegrating fibrous material
AT222474B (de) * 1959-12-28 1962-07-25 Josef Richter Zerkleinerungsmaschine für Futtermittel
US3302893A (en) * 1964-02-18 1967-02-07 Wedco Disc mill

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4674689A (en) * 1980-11-19 1987-06-23 Ranks Hovis Mcdougall Ltd. Milling machines
US4426897A (en) 1981-07-13 1984-01-24 Littleton Francis J Thermal adjustment method and apparatus for rotating machines
US4527473A (en) * 1981-07-13 1985-07-09 Littleton Francis J Thermal adjustment apparatus for rotating machines
US4820980A (en) * 1987-05-04 1989-04-11 Dodson Edgars Darryl Gap, wear and tram measurement system and method for grinding machines
US5544819A (en) * 1993-06-11 1996-08-13 The Haigh Engineering Company Ltd. Rotary disintegrators
US6657427B2 (en) * 2000-03-23 2003-12-02 D/A Production Ab Method and device for measuring a distance between a stator and a rotor
US20040169506A1 (en) * 2001-09-26 2004-09-02 Bengt Akerblom Transducer for distance measurement
US7064536B2 (en) * 2001-09-26 2006-06-20 Daprox Ab Transducer for distance measurement
WO2007094711A1 (en) * 2006-01-16 2007-08-23 Metso Paper Inc. A method and a device for controlling the alignment between refining surfaces
US20090032630A1 (en) * 2006-01-16 2009-02-05 Metso Paper, Inc. Method and a Device for Controlling the Alignment Between Refining Surfaces
US7845583B2 (en) 2006-01-16 2010-12-07 Metso Paper, Inc. Method and a device for controlling the alignment between refining surfaces
RU2412005C2 (ru) * 2006-01-16 2011-02-20 Метсо Пэйпер Инк. Способ и устройство контроля выравнивания измельчающих поверхностей
CN101360564B (zh) * 2006-01-16 2012-07-25 美佐纸业股份有限公司 用于控制精磨表面之间对准的方法和装置
CN108301246A (zh) * 2017-12-31 2018-07-20 东莞市泰昌纸业有限公司 在使用废纸造纸的磨浆过程中降低长纤维折断率的方法
CN108301246B (zh) * 2017-12-31 2019-02-26 东莞市泰昌纸业有限公司 在使用废纸造纸的磨浆过程中降低长纤维折断率的方法
CN110055791A (zh) * 2019-04-17 2019-07-26 南宁学院 实验室超声废纸脱墨设备
CN110055791B (zh) * 2019-04-17 2020-11-06 南宁学院 实验室超声废纸脱墨设备

Also Published As

Publication number Publication date
FI49194B (enExample) 1974-12-31
JPS4833104A (enExample) 1973-05-08
CA962494A (en) 1975-02-11
DE2239119A1 (de) 1973-03-01
GB1365204A (en) 1974-08-29
FR2151889A5 (enExample) 1973-04-20
FI49194C (fi) 1975-04-10

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