US3799456A - Refiner plate clearance control system - Google Patents

Refiner plate clearance control system Download PDF

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Publication number
US3799456A
US3799456A US00262536A US26253672A US3799456A US 3799456 A US3799456 A US 3799456A US 00262536 A US00262536 A US 00262536A US 26253672 A US26253672 A US 26253672A US 3799456 A US3799456 A US 3799456A
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United States
Prior art keywords
base
refining surfaces
refining
signal
control system
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Expired - Lifetime
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US00262536A
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English (en)
Inventor
J Jewell
L Skeen
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.)
Sprout Bauer Inc
Bauer Brothers Co
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Bauer Brothers 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 Bauer Brothers Co filed Critical Bauer Brothers Co
Priority to US00262536A priority Critical patent/US3799456A/en
Priority to CA166,064A priority patent/CA1008540A/en
Priority to FI1115/73A priority patent/FI57321C/fi
Priority to JP5417573A priority patent/JPS5536755B2/ja
Priority to SE7307857A priority patent/SE403974B/xx
Priority to AT521573A priority patent/AT351352B/de
Application granted granted Critical
Publication of US3799456A publication Critical patent/US3799456A/en
Assigned to SPROUT-BAUER, INC., reassignment SPROUT-BAUER, INC., MERGER (SEE DOCUMENT FOR DETAILS). EFFECTIVE DATE JULY 9, 1987 Assignors: SWM CORPORATION, MERGED INTO BAUER BROS. CO. CHANGED TO
Anticipated expiration legal-status Critical
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
    • B02C7/00—Crushing or disintegrating by disc mills
    • B02C7/11—Details
    • B02C7/14—Adjusting, applying pressure to, or controlling distance between, discs

Definitions

  • An automatic control system for maintaining a constant preset distance between the operating surfaces of reduction equipment such as a disc refiner including means for moving one of opposed refining surfaces to and from the other.
  • the control system comprises a first feed-back device which produces a voltage related to the position of one refining surface and a second feed-back device producing a voltage related to the position of the opposed surface.
  • Means are provided to combine these voltages and produce a composite signal representing the distance between the refining surfaces at any one instant during a refining operation. This composite signal is referenced to a pre-set signal having a value corresponding to the desired spacing between the refining surfaces. Means are provided whereby a difference in these signals produces an appropriately controlled movement of the one refining surface toward or from the other until the combined feed-back signal corresponds to the pre-set signal.
  • control system of the present invention is so designed and arranged to constantly sense and correct for any variation in a pre-set spacing between opposed refining surfaces regardless of its source.
  • control structure provided mounts to a neutral beam supported in a connected relation to the refiner base.
  • This beam mounts a pair of feed-back devices which are respectively arranged to sense and to produce a voltage related to the position of one or the other of the opposed refiner discs.
  • Means are connected to continuously combine these voltages and to transmit a combined signal representing the actual distance between the refining surfaces in any one instant.
  • the combined signal is fed to a differential amplifier in which it is compared with a transmitted signal the phase and amplitude of which are representative of the pre-set and desired spacing between the refining surfaces.
  • the amplifier output is connected to actuating means which is continuously operated thereby to move a connected refining surface to and from the other as and to the extent required, if
  • Another object of the invention is to provide means for constantly monitoring the distance between opposed refining surfaces and for adjusting to compensate for any variation therein.
  • a further object of the invention is to provide means for use in a disc refiner installation or the like which inhibits inadvertent contact between its opposed refining surfaces.
  • Another object of the invention is to provide means in connection with a refiner base which are adapted to reflect changes in position of opposed refining surfaces, and to accommodate consequent distortion in the refiner base, and to continuously induce the maintenance of a pre-set distance between the refining surfaces.
  • An additional object of the invention is to provide a control system for maintaining automatically the required spacing between opposed refining surfaces possessing the advantageous structural features, the inherent meritorious characteristics and the means and mode of use herein described.
  • FIG. 1 is a diagrammatic top plan view of a double disc refiner installation illustrating a neutral beam support in connection with the refiner base and mounting a pair of feedback devices in accordance with the present invention
  • FIG. 2 is a fragmentary perspective view further illustrating the relation of the invention control system to one end of the refiner base;
  • FIG. 3 schematically illustrates the control system of the present invention.
  • the refiner has an installation in a base 1 which has defined therein a central well 2 and end wells 3 and 4. Since the precise construction of the base 1 or the disc refiner does not constitute a limitation on the present invention, the same is shown and described only to the extent necessary for an understanding of the present disclosure by one versed in the art. It is to be understood, of course, that the base 1 is so constructed as to be subjected to as little distortion as possible during the operation of the refiner.
  • a double disc refiner includes a housing (not shown) containing a pair of circular discs or plates 5 and 6 mounting facing refiner plates providing immediately opposed refining surfaces 7 and 8.
  • the discs 5 and 6 are located within the housing the lower portion of which nests in the well 2.
  • the housing will include a pulp inlet and a pulp outlet for directing material for refining between and for discharge from the refiner discs.
  • the disc 5 is fixed on one end of a drive shaft 9.
  • the shaft 9 extends to one end of the refiner base and is rotatably supported at longitudinally spaced locations thereon in an inboard bearing housing 10 seated on the top of the base inboard pedestal 11 and in an outboard bearing housing 12 mounted on the base outboard pedestal 13.
  • a drive motor 14 is positioned to partially nest in the well 3 between the inboard pedestal 11 and the outboard pedestal 13.
  • the rotor portion of the motor 14 is conventionally secured in a driving relation to the shaft 9 while the stator portion of the motor 14 may be suitably supported on the side walls of the refiner base. Accordingly, on energizing the motor 14 the shaft 9 and the disc 5 are commonly rotated, for example in the direction of the arrow A shown in FIG.
  • the disc 6 is similarly mounted to a shaft 15 for rotation in an opposite direction as indicated by the arrow B in FIG. 1.
  • the shaft 15 projects through and rotates within the bearing housings 16 and 17 respectively secured on the inboard and outboard pedestals of therefiner base to the end opposite that supporting the bearing housings for the shaft 9.
  • the shaft 15 has a drive motor 18 composition of which is similar to that of the motor 14, the motor 18 nesting in part in the well 4.
  • the shaft 15 differs from the shaft 9 in that it is axially movable with respect to the bearing housing 16 and 17. As will be obvious, an axial movement of the shaft 15 will produce a common movement of the disc 6 and its refining surface 8 appropriately toward and away from the disc 5 and its refining surface 7.
  • the disc refiner housing (not shown) will be provided with appropriate sealing and bearing means to permit the projection therethrough and the relative axial movement of the shaft 15.
  • Axial movement of the shaft 15 may be accomplished by mechanism such as illustrated in the aforementioned U.S. Pat. No. 3,129,898. However, any equivalent means may be employed for achieving movement. Therefore, for purposes of illustration the means for adjusting the position of the shaft 15 and the connected disc 6 is illustrated only to the extent required for the present disclosure. For such purpose, the mode of power required for movement of the shaft 15 is shown to derive, by way of example, from a double acting hydraulic cylinder 19. As seen, the cylinder 19 may be mounted in connection with the bearing housing 17 and conventionally contain therein a piston 20 and in connection therewith a piston rod 21 projecting from the end of the cylinder remote from the bearing housing 17.
  • Suitable means will be provided so that the movement of the piston 20 and the piston rod 21 will be translated into a corresponding movement of the shaft 15. Since this may be achieved by any mechanic versed in the art, the details of the interrlation of the piston and the piston rod with the shaft 15 are not here shown.
  • the feed inlet of the housing for the discs 5 and 6 is located adjacent and to the rear of the disc 5.
  • the left hand of the refiner as shown in FIG. 1 is generally referred to as the feed end.
  • the means for moving the disc 6 toward and away from the disc 5 is located at the right hand end of the refiner as viewed in FIG. 1, this end is generally referred to as the control end.
  • the control system of the present invention is directed to the maintenance of a constant distance between the refining surfaces 7 and 8, for purposes of reference, this distance is defined between arrows C of FIG. 1.
  • the control system of the present invention is based upon the concept of providing and comparing a first signal corresponding to the actual positions of the refining surfaces 7 and 8 with a second signal corresponding to the desired or pre-set positions of these refining surfaces. Another way of putting this is that the first signal corresponds to the actual distance between the refining surfaces and the second signal relates to the desired distance. In practice, these two signals are compared and the hydraulic cylinder 19 is actuated to cause a movement of the disc 6 toward and away from the disc 5 until the actual and desired signals are the same. This indicates that the desired distance between the refining surfaces 7 and 8 is achieved and maintained. Both of the signals are maintained throughout the refining process and the hydraulic unit 19 is actuated in response to such signals whenever circumstances so require.
  • a pair of feed-back devices are used.
  • the feed-back devices employed in the illustrated embodiment are in the form of linear displacement transducers, well known in the pertaining art.
  • Such feed-back devices comprise measuring devices which produce an output signal in the form of a voltage which is precisely proportional to the mechanical displacement of an incorporated sensing probe.
  • these devices each comprise a linear voltage differential transformer (hereinafter referred to as an L.V.D.T.). In its simplest form the L.V.D.T.
  • L.V.D.T. has been refined to a point where it is extremely accurate and capable of sensing displacements on the order of one-millionth of an inch or less.
  • the displacements dealt with in the present invention are generally measured in thousandths of an inch and appropriate L.V.D.T.s for use with the control system taught herein are readily available on the market.
  • both L.V.D.T.s in the instant control system are mounted on a neutral support, i.e. a base or support not subject to the distortion by the double disc refiner or the refiner base.
  • a neutral support i.e. a base or support not subject to the distortion by the double disc refiner or the refiner base.
  • the frame 24 includes, spaced outwardly and generally parallel to the control end of the base 1, a transversely disposed elongated base portion 24a which extends substantially the full width of the refiner base and is spaced from the control end thereof by right angled leg portions 24b. This elongated base portion 24a of the frame 24 constitutes a neutral beam upon which the feed-back devices are mounted.
  • a feed-back device 27 is shown in FIG. 2 as mounted in a bracket 28 secured to the neutral beam portion 24a of the support frame 24.
  • the device 27 has a probe 29 operatively connected to one end of an arm 30 the other end of which is fixed to the housing of the cylinder 19. Since the housing of cylinder 19 will have reflected therein any distortion of the base 1, in respect to which symmetrical base the disc 5 has a relatively fixed position, the feed-back probe 29 will sense any such distortion and thereby the position of the disc, 5 and its refining surface 7.
  • a second feed-back device is shown at 31.
  • the device 31 is mounted in a bracket 32 which is also affixed to the neutral beam portion 24a of the frame 24.
  • the feed-back device 31 has a probe 33 operatively fixed in connection with one end of an arm 34, the other end of which is attached to the projected end of the piston rod 21.
  • the feedback device 31 will react to provide a voltage signal which is directly related to the position of piston rod 21. Since rod 21 is connected to shaft 15, and since shaft 15 is, in turn, connected to disc 6 and its refining surface 8, the voltage signal of feed-back device 31 will correspond and directly relate to the position of refining surface 8.
  • the feedback device 27 constantly monitors the position of the housing of the cylinder 19 (equivalent to the position of refining surface 7). Also, the feedback device 31 constantly monitors the axial position of the rod 21 which is equivalent to the position of the refining surface 8. As noted previously, these readings will be taken with respect to the neutral beam 24a upon which both devices 27 and 31 are mounted. Since the neutral beam 24a is subject to a movement or distortion of only about 0.001 inch maximum under the most severe refiner loading conditions, providing the feed-back devices are properly calibrated, the devices will work together to continuously monitor the variations in distance between the refining surfaces 7 and 8.
  • the feed-back devices 27 and 31 send their signals to an electrical circuit in which they are combined and compared to a signal corresponding to that which would be received if the refining surfaces 7 and 8 were actually at the desired distance from each other.
  • the related system for adjusting the position of the disc 6 and its refining surface 8 will receive a signal causing it to function to move the shaft 15 and the connected disc 6 and its refining surface 8 toward or away from the refining surface 7 to achieve the desired spacing between the refining surfaces.
  • the feed-back device 27 has its sensing element 29 in operative connection with the cylinder housing 19 through an arm 30 while the feed-back device 31 has its sensing element, in effect, interrelated to sense the position of the piston rod 21, the position of which determines the position of the refining surface 8 through the medium of the shaft 15.
  • the outputs 35 and 36 of these feed-back devices will be combined as at 37 and transmitted through a lead 38 to a summing point 39.
  • a source for a command signal having a phase and amplitude representative of the desired and predetermined space in between refining surfaces 7 and 8 is diagrammatically indicated at 40.
  • This signal source 40 may be a potentiometer which has in association therewith a micro-dial mounted on a control panel and indicating the desired spacing of the refining surfaces.
  • the output of the command signal source 40 is conducted by a lead 41 to the summing point 39.
  • the combined signal resulting at the summing point is transmitted by way of lead 42 to a differential amplifier 43.
  • the latter is of the type well known in the art having an output de pendent upon the amplitude and phase relationships of its input signals.
  • the output 44 of the amplifier 43 is connected to a servo valve 45 which together with the unit 19 comprises the means for furnishing the motive power for axially shifting the shaft 15 and thereby the position of the refining surface 8.
  • the servo valve 45 is operated to control the flow of oil into or out of the closing side of the cylinder 19 through hydraulic line 46 and is connected to a supply of hydraulic fluid.
  • the valve 45 will have a conventional feed-back 47 to the amplifier 43.
  • the position of the discs and the respective refining surfaces will be continually sensed by the feed-back devices 27 and 31.
  • feedback device 27 will through the movements of the cylinder housing 19 obtain and signal a reading equivalent to the position of disc 5 and its refining surface 7.
  • Feedback device 31 will directly sense the movement of the piston rod 21 and obtain a reading equivalent to the position of the disc 6 and its refining surface 8.
  • the outputs of the feed-back devices are combined to form a first signal which has a phase and amplitude equivalent to the actual positions of the refining surfaces 7 and 8.
  • This first signal will be compared to a signal from the command signal source 7 which has been pre-set to produce a signal having a phase and amplitude representative of the desired spacing between the refining surfaces 7 and 8.
  • the combined and pre-set signal will be fed into a differential amplifier 43 which in turn produces a signal actuating the servo valve 45.
  • the latter will function in a conventional manner to cause an appropriate shifting of the piston 20 and piston rod 21.
  • the movements of the piston 20 will produce pressure through the hydraulic fluid involved to transmit through whatever mechanical means are employed a signal influence and appropriate shifting of the shaft carrying the disc 6. In this manner the refining surface 8 may be moved toward or away from the refining surface 7 to achieve and maintain the desired and predetermined spacing between the refining surfaces.
  • the nature of the invention system is such that upon failure of material feed or shut-down of a flow of material to and between the refining surfaces, the control system of the present invention will prevent the refining surfaces from coming into contact with each other upon sudden release of pressure therebetween, irrespective of the nature and degree of the pressure.
  • the invention has provided a simple but highly effective system for insuring a continuing control of refiner plate clearance which is automatic in character and which obviates the need for continuous attendance on the equipment in often futile efforts to maintain a uniformity of space in between the refining surfaces.
  • a safety in operation and quality results are inherent in the practice of the invention.
  • An automatic control system for maintaining constant a pre-set distance between opposed refining surfaces of pulp refining equipment supported on a common base, said refining surfaces being relatively adjustable toward and from one another, including actuating means for moving one of said refining surfaces toward and away from the other, sensing means for continuously producing a first signal of the actual distance between said opposed refining surfaces, means for producing a second signal representative of the desired distance between said refining surfaces, means to receive and compare said first and second signals and to respond to differences to produce a third signal arranged to energize said actuating means to restore the desired distance between said refining surfaces.
  • An automatic control system as in claim 1 characterized by said actuating means being arranged to function until said first and second signals become equal.
  • sensing means producing said first signal is comprised of independent means for sensing the respective positions of the respective refining surfaces, the combination of which sensing means produces said first signal.
  • An automatic control system as in claim 3 characterized by one of said means sensing the position of one of said refiningsurfaces being interrelated to sense the position of the said one refining surface through movements of said common base.
  • An automatic control system as in claim 1 characterized by its application to opposed refining surfaces supported on a common base, including a support means in connection with and having a relatively neutral position in reference to said base and any distortion which might be reflected therein, further characterized by said sensing means for producing said first signal being constituted by a plurality of sensing means positioned on said neutral support to independently respond to the position of a respective one of said refining surfaces, there being means combining said independent responses to produce said first signal.
  • An automatic control system as in claim 5 characterized by said independent sensing means beingrespectively related to directly sense the position of one of said opposed refining surfaces and to indirectly sense the position of the other of said opposed refining surfaces through said common base.
  • An automatic control system as set forth in claim 1 characterized by its application to refiner discs presenting opposed refining surfaces supported for relative rotation upon a symmetrical base, characterized by said sensing means having means mounting the same in connection with one end of said base to respectively sense the position of said discs and said refining surfaces through support means provided therefor on said base.
  • An automatic control system as in claim 1 in a refiner installation characterized by a symmetrical base mounting centrally thereof refiner discs including said opposed refining surfaces and said discs respectively mounting to a drive shaft, characterized by a neutral support beam connected to form an extension of said base to one end thereof and in a position constituting a relatively neutral position wherein any distortion of the base has a minimal influence and said sensing means for producing said first signal being mounted on said beam to sense the position of said refining surfaces through one of said shafts and through said base.
  • An automatic control system as in claim 9 characterized by said means for continuously producing a first signal being constituted by independent sensing means one of which has a direct operative relation to one of said shafts and the other of which has an operative relation to means in connection with said base.
  • An automatic control system for maintaining constant a pre-set clearance between opposed refining surfaces of pulp refining equipment supported on a common base, said refining surfaces being relatively adjustable toward and from one another, including actuating means for moving one of said refining surfaces toward and away from the other, sensing means for continuously producing a first electrical signal the phase and amplitude of which are representative of the actual clearance between said opposed refining surfaces, means for continuously producing a second electrical signal the phase and amplitude of which are representative of the desired clearance between said opposed refining surfaces, means for receiving and comparing said first and second signals and responding to differences therein to produce a third electrical signal energizing said actuating means to move said one refin ing surface in a direction relatively to the other to render said first and second electrical signals equal and thereby to restore the desired clearance between said opposed refining surfaces.
  • said one refining surface is supported by a shaft rotatively mounted on said base and axially shiftable
  • said actuat-, ing means comprising an hydraulic cylinder having a piston with a piston rod operatively connected to said axially shiftable shaft and a servo valve to energize said hydraulic cylinder, said third signal being conveyed to said servo valve whereby to energize said servo valve and hence said hydraulic cylinder and to control the direction and amount of shift of said shaft and said one refining surface supported thereby.
  • said sensing means comprises first and second linear voltage differential transformers, said first transformer sensing the position of said one of said opposed refining surfaces, said second transformer sensing the position of the other of said opposed refining surfaces, the combined outputs of said first and second providing said first electrical signal.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Paper (AREA)
  • Crushing And Grinding (AREA)
US00262536A 1972-06-14 1972-06-14 Refiner plate clearance control system Expired - Lifetime US3799456A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US00262536A US3799456A (en) 1972-06-14 1972-06-14 Refiner plate clearance control system
CA166,064A CA1008540A (en) 1972-06-14 1973-03-14 Refiner plate clearance control system
FI1115/73A FI57321C (fi) 1972-06-14 1973-04-09 Automatiskt reglersystem foer avstaondet mellan raffineringsytorna i en raffinoeranordning foer fibermassa
JP5417573A JPS5536755B2 (enrdf_load_stackoverflow) 1972-06-14 1973-05-17
SE7307857A SE403974B (sv) 1972-06-14 1973-06-04 Anordning for att automatiskt halla malspalten mellan motsatta raffineringsytor i en pappersraffinor vid ett forinstellt verde
AT521573A AT351352B (de) 1972-06-14 1973-06-13 Automatische regeleinrichtung zur konstant- haltung eines festgesetzten mahlscheiben- abstandes in einer scheibenmuehle

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Application Number Priority Date Filing Date Title
US00262536A US3799456A (en) 1972-06-14 1972-06-14 Refiner plate clearance control system

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US3799456A true US3799456A (en) 1974-03-26

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Application Number Title Priority Date Filing Date
US00262536A Expired - Lifetime US3799456A (en) 1972-06-14 1972-06-14 Refiner plate clearance control system

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US (1) US3799456A (enrdf_load_stackoverflow)
JP (1) JPS5536755B2 (enrdf_load_stackoverflow)
AT (1) AT351352B (enrdf_load_stackoverflow)
CA (1) CA1008540A (enrdf_load_stackoverflow)
FI (1) FI57321C (enrdf_load_stackoverflow)
SE (1) SE403974B (enrdf_load_stackoverflow)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3961757A (en) * 1975-04-02 1976-06-08 Cellwood Machinery Ab Method and machine for refining wood chippings, shavings, paper pulp and the like
US4233600A (en) * 1978-06-07 1980-11-11 Pulp And Paper Research Institute Of Canada Method and system for detecting plate clashing in disc refiners
US4382558A (en) * 1979-03-19 1983-05-10 F. L. Smidth & Co. Roller mill
US4454991A (en) * 1982-02-22 1984-06-19 St. Regis Paper Company Apparatus and method for monitoring and controlling a disc refiner gap
US4878625A (en) * 1988-07-29 1989-11-07 Grindmaster Corporation Bean and nut grinder shift mechanism
US4950986A (en) * 1988-06-27 1990-08-21 Combustion Engineering, Inc. Magnetic proximity sensor for measuring gap between opposed refiner plates
WO1993019846A1 (en) * 1992-04-07 1993-10-14 Sunds Defibrator Industries Aktiebolag Device at a disk refiner
US5509610A (en) * 1994-01-27 1996-04-23 Gibbco, Inc. Centrifugal chopping and grinding apparatus
US20070187534A1 (en) * 2003-04-16 2007-08-16 Anson James H Adjustable grinder
WO2013081527A1 (en) * 2011-11-30 2013-06-06 Metso Paper Sweden Ab Stand for refining apparatus
US20150367350A1 (en) * 2013-03-25 2015-12-24 Maschinenfabrik Gustav Eirich Gmbh & Co. Kg Granules conditioner

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6477694A (en) * 1987-09-16 1989-03-23 Aikawa Tekko Operation method in papermaking refiner
WO2004111331A2 (en) * 2003-06-09 2004-12-23 Kadant Black Clawson Inc. Self-aligning and actively compensating refiner stator plate system

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1738288A (en) * 1927-07-19 1929-12-03 Us Colloid Mill Corp Homogenizing mill
US3129898A (en) * 1961-04-18 1964-04-21 Bauer Bros Co Refiner construction
US3212721A (en) * 1961-09-22 1965-10-19 Defibrator Ab Grinding apparatus for treating fibrous material
US3434670A (en) * 1966-07-07 1969-03-25 Pulp Paper Res Inst Apparatus for measuring out of tram and plate separation of disc refiners
US3500179A (en) * 1967-07-17 1970-03-10 Pulp Paper Res Inst System for displaying out-of-tram measurements in disc refiners
US3700175A (en) * 1970-08-05 1972-10-24 Hisatuna Saito Gap controlling device for a cone crusher

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4116402Y1 (enrdf_load_stackoverflow) * 1965-06-23 1966-07-29

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1738288A (en) * 1927-07-19 1929-12-03 Us Colloid Mill Corp Homogenizing mill
US3129898A (en) * 1961-04-18 1964-04-21 Bauer Bros Co Refiner construction
US3212721A (en) * 1961-09-22 1965-10-19 Defibrator Ab Grinding apparatus for treating fibrous material
US3434670A (en) * 1966-07-07 1969-03-25 Pulp Paper Res Inst Apparatus for measuring out of tram and plate separation of disc refiners
US3500179A (en) * 1967-07-17 1970-03-10 Pulp Paper Res Inst System for displaying out-of-tram measurements in disc refiners
US3700175A (en) * 1970-08-05 1972-10-24 Hisatuna Saito Gap controlling device for a cone crusher

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3961757A (en) * 1975-04-02 1976-06-08 Cellwood Machinery Ab Method and machine for refining wood chippings, shavings, paper pulp and the like
US4233600A (en) * 1978-06-07 1980-11-11 Pulp And Paper Research Institute Of Canada Method and system for detecting plate clashing in disc refiners
US4382558A (en) * 1979-03-19 1983-05-10 F. L. Smidth & Co. Roller mill
US4454991A (en) * 1982-02-22 1984-06-19 St. Regis Paper Company Apparatus and method for monitoring and controlling a disc refiner gap
US4950986A (en) * 1988-06-27 1990-08-21 Combustion Engineering, Inc. Magnetic proximity sensor for measuring gap between opposed refiner plates
US4878625A (en) * 1988-07-29 1989-11-07 Grindmaster Corporation Bean and nut grinder shift mechanism
WO1993019846A1 (en) * 1992-04-07 1993-10-14 Sunds Defibrator Industries Aktiebolag Device at a disk refiner
US5509610A (en) * 1994-01-27 1996-04-23 Gibbco, Inc. Centrifugal chopping and grinding apparatus
US20070187534A1 (en) * 2003-04-16 2007-08-16 Anson James H Adjustable grinder
US7984868B2 (en) 2003-04-16 2011-07-26 Bunn-O-Matic Corporation Adjustable grinder
WO2013081527A1 (en) * 2011-11-30 2013-06-06 Metso Paper Sweden Ab Stand for refining apparatus
US20150367350A1 (en) * 2013-03-25 2015-12-24 Maschinenfabrik Gustav Eirich Gmbh & Co. Kg Granules conditioner
US10843199B2 (en) * 2013-03-25 2020-11-24 Maschinenfabrik Gustav Eirich Gmbh & Co. Kg Granules conditioner

Also Published As

Publication number Publication date
ATA521573A (de) 1978-12-15
FI57321B (fi) 1980-03-31
JPS4948907A (enrdf_load_stackoverflow) 1974-05-11
JPS5536755B2 (enrdf_load_stackoverflow) 1980-09-24
CA1008540A (en) 1977-04-12
AT351352B (de) 1979-07-25
FI57321C (fi) 1980-07-10
SE403974B (sv) 1978-09-18

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