US3776475A - Automatic pulp grinder control - Google Patents

Automatic pulp grinder control Download PDF

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Publication number
US3776475A
US3776475A US00272360A US3776475DA US3776475A US 3776475 A US3776475 A US 3776475A US 00272360 A US00272360 A US 00272360A US 3776475D A US3776475D A US 3776475DA US 3776475 A US3776475 A US 3776475A
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United States
Prior art keywords
pulpstone
wood
shower
fluid
grinder
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
US00272360A
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English (en)
Inventor
J Perry
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.)
Saint Gobain Abrasives Inc
Original Assignee
Norton Co
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 Norton Co filed Critical Norton Co
Application granted granted Critical
Publication of US3776475A publication Critical patent/US3776475A/en
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/14—Disintegrating in mills
    • D21B1/18—Disintegrating in mills in magazine-type machines
    • D21B1/24—Disintegrating in mills in magazine-type machines of the pocket type

Definitions

  • ABSTRACT An automatic water shower flow control for a paper pulp grinding machine for control of pulp quality wherein the shower flow is regulated in accordance with the power input to the pulp grinding means.
  • the pieces of logs are pressed against the surface of the pulpstone with their longitudinal axes generally parallel to the axis about which the grinding wheel rotates, while separate shower means direct streams of water onto spaced apart portions on the surface of the wheel to cool and clean the grinding surface and produce a water layer between the grinding surface and the logs.
  • the quantity of water supplied to the grinding operation is quite critical to the production of pulp of the highest quality and most frequently the foreman in charge of the operation manually adjusts certain of the shower control valves from time to time to control the resulting pulp quality.
  • an automatic shower control for example, in a two pocket grinder, that has the usual cleaning and cooling showers which are adapted to be used along with variable flow, quality control showers.
  • the cleaning and cooling showers are positioned to direct a relatively high pressure fluid flow continuously against portions of the moving surface of the grinding wheel as the wheel rotates and the several portions of the wheels surface exit from the respective grinding pockets.
  • the critical quality control shower means are positioned relative to their coacting portions of the pulpstone surface to cause a layer of water to form on the surfaces of the wheel as these grinding surfaces under the influence of these means enter the spaced apart log holding pockets.
  • the volume of water flow to the quality control shower heads is made directly proportional to the infeed power to the grinding wheel and with proper manual adjustment at start-up of the grinding operation, to the type of wood being ground, the abrasive characteristics of the wheel and the grinder pressure being used, control of the pulp quality can be maintained automatically.
  • the drawing diagrammatically shows an end view of a two pocket pulp grinder having a shower system therein which is representative of my invention.
  • Suitable cleaning and cooling showers 20 and 21 are provided to direct high pressure jets of water against oppositely disposed surfaces of the grinding wheel just as these surface portions leave the grinding pockets.
  • the showers are provided with nozzles to impinge the shower fluid radially inwardly across the entire length of the wheel and against the surface of the pulpstone to loosen and wash away the fibres released from the logs. Additional water may be flushed from showers 20 and 21 onto the surface being cleaned if necessary to cool it to the desired degree whereby to avoid overheating the fibres making up the pulp as the fibres are liberated to mix with the fluid supplied by the quality control showers to produce the pulp. Temperature control at the time of fibre separation and in the pulp mass is critical to production of high quality pulp.
  • the showers 20 and 21 are supplied with white water from a suitable header 22 that is designed to carry the shower fluid at a minimum of about psi. and in temperature range of about 90 F. to F.
  • the header connects to pipe 23 that has two branch feeder lines 24 and 25 connected to showers 20 and 21 respectively which as above stated function to clean the surface of the pulpstone across its entire length and control its temperature.
  • the header 22 also feeds shower water to the quality control showers 30 and 31 of my invention.
  • the connection is through pipe 32 having an automatically controlled throttle valve 33 in it, the valve being positioned to control the volume of fluid delivered to the branch lines 34 and 35 that lead to showers 30 and 31 respectively.
  • These showers direct fluid radially across the entire length of the wheel and against the oppositely disposed surface portions of the pulpstone at locations where these cleaned and cooled surface portions are about to enter the two oppositely disposed grinding pockets.
  • the showers 30 and 31 are the quality control showers that are primarily operative to determine the quality of the resulting pulp.
  • showers produce a uniform layer of fluid throughout the entire area of the respective surface portions over which they are positioned, which fluid layer is carried at least in part into the grinding zone by being trapped in the pores of the wheel and spaces between the abrasive grits on the surface of the wheel.
  • the primary source of fluid thus made available at the grinding interface between the pulpstone and the wood is controlled by the operation of showers 30 and 31.
  • an electric motor is used to drive the pulpstone and a proportional flow meter is electrically connected to the power lines leading to motor 15.
  • the meter responsive to the energy input to the motor functions to operate a suitable controller means connected to throttle valve 33 whereby the valve is automatically operated in accordance with the meter reading.
  • the meter and controller coact to operate the throttle valve to produce a predetermined flow of fluid to showers 30 and 31 that is automatically adjusted to vary directly with the power fed to motor 15.
  • the specific meter and controller means for valve 33 may be selected from a number of proportional flow control devices sold commercially such as for example an electrical meter and controller that can be purchased from the Leeds and Northrup Company.
  • valve 33 can initially adjust valve 33 to produce the desired quality of pulp for a given type of wood, as is done in current practice, by manually adjusting valves 36 and 37.
  • This procedure involves loading one pocket 11 for example with wood, pressing the wood against the driven pulpstone while an excess of fluid is showered onto the surface of the grinding wheel at the inlet side of the wheel surface to the pocket from its corresponding quality control shower. The wood is pressed against the wheel until normal grinding action results and then the quality control shower means is manually adjusted by valve 36 to gradually cut off the flow of fluid through the shower. This manual throttling continues until an absence of water permits the wood to get so hot as to produce a burning odor.
  • valve 36 is reversed to let more water flow onto the wheel from the quality control shower 30 to an extent to just eliminate the burning odor.
  • This operation is repeated on the other pocket 12 and then when both grinder pockets have been put into operation under the manual control of valves 36 and 37, the flow of fluid to the quality control showers is placed under the control of valve 33.
  • the automatic controller for operating valve 33 can be phased in and as conditions change, the throttle valve 33 is automatically adjusted to supply more or less fluid to the grinding zone depending upon the pre-arranged throttle valve characteristics.
  • the actual quantity, composition and temperature of the particular fluid used for quality control are well known factors that may be varied in order to produce a given quality or type of pulp from a specific kind of wood selected from the various kinds of woods that are made into pulp in conventional pulp grinders.
  • My system provides for automatically controlling the variation of the quantity of the desired fluid flow to showers 30 and 31 within the known parameters of the conventional wood pulp grinding process in accordance with the power utilized in the grinding process.
  • a solenoid operated valve 38 is mounted in line 34 leading to shower 30 and a similar solenoid operated valve 39 is in pipe 35. Valves 38 and 39 are automatically operated to reduce the fluid flow to their associated shower means when a pocket is being loaded. This automatic reduction of fluid to the quality control shower of an inactive pocket prevents the grinding wheel from being unduly cooled by what would otherwise to an over supply of fluid to its surface but yet the residual flow is maintained to prevent over-cooling of the surface of the pulpstone at the inactive area.
  • a pulpstone grinder for separating fibres from wood comprising a motor for rotating a pulpstone, means to press wood to be ground against a portion of the surface of the pulpstone, a quality control shower means, a source of fluid under pressure to be fed to the shower for delivery by the shower to the portion of the pulpstone surface having an interface with the wood, variable power supply means to drive the motor, a throttle valve between said fluid source and said shower means, and a proportional flow controller means operatively connected between said power supply and said throttle valve and responsive to variations of said power supply to feed more fluid to said interface portion of the pulpstone as the power delivered to the motor increases and to decrease the quantity of fluid feed to the interface when the power delivered to the motor decreases.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
US00272360A 1972-07-17 1972-07-17 Automatic pulp grinder control Expired - Lifetime US3776475A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US27236072A 1972-07-17 1972-07-17

Publications (1)

Publication Number Publication Date
US3776475A true US3776475A (en) 1973-12-04

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ID=23039466

Family Applications (1)

Application Number Title Priority Date Filing Date
US00272360A Expired - Lifetime US3776475A (en) 1972-07-17 1972-07-17 Automatic pulp grinder control

Country Status (5)

Country Link
US (1) US3776475A (de)
AT (1) AT334190B (de)
CA (1) CA980611A (de)
DE (1) DE2336350A1 (de)
FI (1) FI53600C (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4294412A (en) * 1976-12-27 1981-10-13 Sca Development Aktiebolag Method and apparatus for controlling wood pulp grinding machines
FR2546196A1 (fr) * 1983-05-20 1984-11-23 Voith Gmbh Procede et installation de reglage d'un defibreur
US4515318A (en) * 1979-11-08 1985-05-07 Kymi-Stromberg Oy Method for controlling a piston fed wood grinder
DE4308039A1 (de) * 1993-03-13 1994-09-15 Voith Gmbh J M Verfahren zur Regelung eines Holzschleifers
US20040251336A1 (en) * 2000-02-29 2004-12-16 Morris Charles D. Method and apparatus for grinding rubber
US6855044B2 (en) * 2001-03-30 2005-02-15 F.W. Roberts Manufacturing Company, Inc. Burr for preparing a homogeneous pulpstone surface

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2804334C3 (de) 1978-02-02 1981-09-10 J.M. Voith Gmbh, 7920 Heidenheim Holzschleifer mit stetiger Zuführung des Holzes
DE3014802C2 (de) * 1980-04-17 1984-12-13 J.M. Voith Gmbh, 7920 Heidenheim Schleifer zum Herstellen von Holzschliff
SE434069B (sv) * 1980-07-09 1984-07-02 Mo Och Domsjoe Ab Forfarande for framstellning av slipmassa
DE3804869A1 (de) * 1988-02-17 1989-08-31 Feldmuehle Ag Verfahren zur regelung eines holzschleifers

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3690568A (en) * 1970-06-11 1972-09-12 Koehring Waterous Ltd Wood grinding
US3693891A (en) * 1971-06-24 1972-09-26 Norton S Remmer Wood grinding

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3690568A (en) * 1970-06-11 1972-09-12 Koehring Waterous Ltd Wood grinding
US3693891A (en) * 1971-06-24 1972-09-26 Norton S Remmer Wood grinding

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4294412A (en) * 1976-12-27 1981-10-13 Sca Development Aktiebolag Method and apparatus for controlling wood pulp grinding machines
US4515318A (en) * 1979-11-08 1985-05-07 Kymi-Stromberg Oy Method for controlling a piston fed wood grinder
FR2546196A1 (fr) * 1983-05-20 1984-11-23 Voith Gmbh Procede et installation de reglage d'un defibreur
DE4308039A1 (de) * 1993-03-13 1994-09-15 Voith Gmbh J M Verfahren zur Regelung eines Holzschleifers
US20040251336A1 (en) * 2000-02-29 2004-12-16 Morris Charles D. Method and apparatus for grinding rubber
US6976646B2 (en) * 2000-02-29 2005-12-20 J.E.M. Morris Construction, Inc. Method and apparatus for grinding rubber
US6855044B2 (en) * 2001-03-30 2005-02-15 F.W. Roberts Manufacturing Company, Inc. Burr for preparing a homogeneous pulpstone surface

Also Published As

Publication number Publication date
ATA631573A (de) 1976-04-15
DE2336350A1 (de) 1974-02-07
AT334190B (de) 1976-01-10
FI53600B (de) 1978-02-28
CA980611A (en) 1975-12-30
FI53600C (fi) 1978-06-12

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