US3810584A - Grinding apparatus for fibrous material - Google Patents

Grinding apparatus for fibrous material Download PDF

Info

Publication number
US3810584A
US3810584A US00288943A US28894372A US3810584A US 3810584 A US3810584 A US 3810584A US 00288943 A US00288943 A US 00288943A US 28894372 A US28894372 A US 28894372A US 3810584 A US3810584 A US 3810584A
Authority
US
United States
Prior art keywords
servomotor
housing
piston
stator
grinding device
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
US00288943A
Other languages
English (en)
Inventor
A Kahmann
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.)
Sulzer Escher Wyss GmbH
Original Assignee
Escher Wyss GmbH
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 Escher Wyss GmbH filed Critical Escher Wyss GmbH
Application granted granted Critical
Publication of US3810584A publication Critical patent/US3810584A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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 invention relates to a grinding device, more especially a disc refiner for the paper industry, which grinding device comprises a housing, in the housing a rotor and a stator which is guided radially but nonrotatably in guideways relatively to the housing and is displaceable axially relatively to the rotor, a servomotor being provided for the displacement of the stator, which motor is connected on one side to the housing and on the other side to the stator and comprises a main piston displaceable hydraulically backwards and forwards between a first and a second pressure chamber of a cylinder, an adjustable arrangement being provided for limiting the movement of the stator in the direction towards the rotor to a desired working position.
  • Such grinding devices are used in the paper industry for preparing the stock to be processed in a paper machine.
  • the pressures which are to be applied by the servomotors for the mutual adjustment and holding of the two grinding members, the stator relatively to the rotor, are very high.
  • the adjustable devices for limiting the displacement of the stator to the actually required working position are quickly damaged, since they have hitherto been constructed as screws with accurate and fine threads. It is then necessary as a consequence to stop the grinding device.
  • the working position of the stator is adjustable by means of a setting screw which forms a stop.
  • the cylinder can be displaced axially by screws.
  • the overall length of the connecting parts between the servomotor and the stator can be altered by screws.
  • the invention has for its object to achieve a disruption-free operation and a longer effective life of the grinding device, also at high pressures.
  • this object is achieved by the fact that the second pressure chamber of the servomotor designed for displacing the stator away from the rotor is provided with an axially displaceable abutment piston, of which the side facing the main piston comprises an abutment surface and of which the other side in association with that end wall of the cylinder which is opposite to it, defines a sealed third pressure chamber in the said cylinder, means being provided for filling the third pressure chamber with a liquid and for maintaining the introduced quantity of the liquid in the pressure chamber.
  • FIG. 1 is a longitudinal section through a grinding device
  • FIG. 2 is a longitudinal section through another embodiment
  • FIG. 3 is a longitudinal section through yet another embodiment
  • FIG. 4 is a longitudinal section of a servomotor to a larger scale
  • FIG. 5 is a longitudinal section to a larger scale of another servomotor.
  • the grinding device which is illustrated is a tandemdisc refiner.
  • the device comprises a housing 1 having a first end cover 2 and a second end cover 3.
  • a bearing block 4 and a stator disc 5 are fixed on the first end cover 2.
  • a shaft 6 is mounted to be longitudinally displaceable relatively to the housing 1 in the bearing block 2 and this shaft is sealed off. At one end, the shaft 6 is connected so as to be longitudinally displaceable to a driving motor (not shown), while it carries at its other end a rotor 7.
  • a second stator 8 is axially displaceable in the housing 1 relatively to the rotor 7.
  • the stator 8 is connected to a cylindrical part 9 which is coaxial with the grinding device and which extends outwardly through a central opening 10 in the second end cover 3 of the housing 1.
  • the part 9 is guided by means of arms 11 and bolts 12 on guideways 13, whereby the radial but non-rotatable guiding of the stator 8 in relation to the housing I is assured.
  • a hydraulic servomotor 14 which is connected on one side by means of a cover 15 to the housing 1 and on the other side by means of the part 9 to the stator 8.
  • the part 9 is connected fast to a main piston 16 of the servomotor 14 and forms the piston rod of the said motor 14.
  • the main piston 16 is displaceable backwards and forwards hydraulically between a first and a second pressure chamber of a cylinder of the servomotor 14.
  • the first of the pressure chambers i.e. the chamber indicated at 17, is intended for the relative movement of the stator 8 towards the rotor 7, while the second chamber indicated at 18 is intended for moving the stator 8 away from the rotor 7.
  • Pipes l9 and 20 are provided for respectively filling the pressure chambers 17 and 18 with a liquid and emptying the liquid therefrom.
  • the pressure chamber 18 of the servomotor 14 which is intended to displace the stator 8 in a direction away from the rotor 7 is provided with an axially displaceable abutment piston 21, of which the side facing the main piston 16 comprises an abutment surface 22, and of which the other side, in conjunction with that end wall 23 of the cylinder of the servomotor 14 which is facing the said other side of the abutment piston 21, defines a sealed-off third pressure chamber 24 in the cylinder.
  • Means (not shown) are provided by which a liquid is able to fill the third pressure chamber 24 through the pipe 25 and for maintaining the introduced quantity of the liquid in the third pressure chamber 24.
  • the third pressure chamber 24 is filled with liquid and the quantity of the liquid which is introduced is maintained therein.
  • a liquid is guided into the first pressure chamber 17 through the pipe 19.
  • the main piston 16 is moved up into the bearing position and against the abutment surface 22 of the abutment piston 21.
  • the movement of the stator 8 in the direction towards the rotor 7 is limited to a required working position by the abutment of 21 and 22. If the stator is to be adjusted to another working position, it is necessary for the quantity of the liquid filling the third pressure chamber 24 to be altered, i.e. more liquid must be introduced or liquid released and the actual quantity in the pressure chamber 24 must then again be maintained.
  • the cylinder of the servomotor in the part 9 is constructed as a cavity 26 which is coaxial with the part 9.
  • a main piston 27 is fixed on a piston rod 28, which is connected by means of a cover 15 to the housing 1.
  • That first pressure chamber of the servomotor which serves for moving the stator 8 in the direction towards the rotor 7 is indicated at 29, and the second pressure chamber, which effects reverse movement of stator 8, is indicated at 18.
  • a third pressure chamber between an abutment piston 30 and an end wall 31 of the cylinder is indicated at 32 and, like the third pressure chamber 24 in FIG. 1, serves to limit the forward displace- .ment of the stator 8 in the directiontowards the rotor 7 to the required working position.
  • Thefluid transfer passages for the three chambers of the servomotor are shown at 19', 20' and 25'.
  • three servomotors 33 according to the invention are arranged on the guideways 13. More than three guideways can also be formed on the grinding device, for example, six such guideways, but only some of them, for example three, can be provided with servomotorsVThe motors are hydraulically connected in parallel.
  • a servomotor 33 on the one guideway 13 of FIG. 3 is shown in greater detail in FIG. 4.
  • the guideway 13 is fixed on the end cover 3 of the housing of the grinding device.
  • the bolt 12 is fixed on the arm 11.
  • 34 represents balls and 35 represents Seeger rings of a displaceable mounting of the bolt 12 in the guideway 13.
  • the servomotor 33 is flanged coaxially of the guideway 13.
  • a piston rod 36 extends from the servomotor 33 through the bolt 12, without contacting the latter, as far as the end cover 3, on which it is fixed.
  • the first pressure chamber 37 is intended for the movement of the displaceable stator towards the rotor and the pressure chamber 38 defined in the second pressure chamber between the main piston and the abutment piston 39 for the movement of said stator away from the rotor.
  • the third pressure chamber 41 for limiting the advance of the stator up to the required working position.
  • 42, 43 and 44 are openings or connections for pipes of a hydraulic operating installation.
  • FIG. 5 A double motor according to the invention is shown in FIG. 5. It is possible to visualise this motor, for example, in place of the servomotor 33 in FIG. 4. its two cylinders 45 and 46 are defined by end walls 47, 48 and 48, 49, respectively. Fixed on a piston rod 50 are two main pistons 51 and 52.
  • One second pressure chamber 57 of the servomotor, i.e. the chamber of the cylinder 45, is provided with a displaceable abutment piston 53, between which and the end wall 47 is defined a third pressure chamber 54.
  • this third chamber 54 serves to limit the advancing of the displaceable stator up to the required working position.
  • First pressure chambers 55 and 56 serve for the advance of the stator and the pressure chamber 57 defined in the second pressure chamber between the main piston 51 and the abutment piston 53 and the second pressure chamber 58 serve for the rearward displacement of the stator 9 relatively to the rotor.
  • Indicated at 59, 60, 61, 62 and 63 are openings or connections for pipes of a hydraulic operating installation (not shown).
  • the not shown operating installation associated with the grinding device and the servomotor consists of known separate elements. The purposes of the operating installation are explained by the example shown in FIG. 1.
  • the operating installation ensures:
  • a grinding device of the type including a housing containing a stator disc which is guided for axial movement toward and away from a cooperating rotor disc with which it defines a grinding gap, and a doubleacting hydraulic servomotor for shifting the stator disc and including a cylinder element containing a piston element which divides the cylinder element into a pair of opposed working spaces, one of said elements being connected with the stator disc, the other element being connected with the housing, and the servomotor being effective to shift the stator disc so as to decrease the width of said gap under the action of pressure in the first working space and to increase the width of said gap under the action of pressure in the second working space, the improvement comprising a reciprocable stop piston located in the cylinder element and defining therewith a sealed control chamber, the stop piston having one end surface which faces the second working space and is arranged to abut the servomotor piston element, and an opposite end surface which faces the control chamber; and transfer passage means through which liquid is introduced into and withdrawn from the control chamber.
  • a grinding device as defined in claim 1 in which said one element of the servomotor is connected with the stator disc through a cylindrical part which is coaxial with both the stator disc and the housing and projects from the housing through a central opening in a wall thereof.
  • a grinding device as defined in claim 2 in which the servomotor is coaxial with said cylindrical part; the piston element is connected with the cylindrical part; and the cylinder element is connected with the housing.
  • a grinding device as defined in claim 2 in which the servomotor is coaxial with said cylindrical part; the piston element is connected with the housing; and the cylinder element is connected with the cylindrical part.
  • a grinding device as defined in claim 2 which includes a plurality of said servomotors arranged parallel with and spaced around the axis of the cylindrical part, each servomotor being provided with said stop piston, control chamber and transfer passage means, and said one element of each servomotor being connected with the cylindrical part.
  • a grinding device as defined in claim 5 including a set of means for guiding the stator disc for said axial movement, each means of the set being coaxial with one of the servomotors and comprising a stationary member connected with the housing and cooperating moveable member which is connected with the cylindrical part through a common connection which also serves to join that part to said one element of the associated servomotor.
  • a grinding device as defined in claim 6 in which the piston elements of the servomotors are connected with the housing and the cylinder elements are connected with the cylindrical part.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Paper (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Crushing And Grinding (AREA)
US00288943A 1971-09-17 1972-09-14 Grinding apparatus for fibrous material Expired - Lifetime US3810584A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2146548A DE2146548C3 (de) 1971-09-17 1971-09-17 Scheibenrefiner, insbesondere für die Papierindustrie

Publications (1)

Publication Number Publication Date
US3810584A true US3810584A (en) 1974-05-14

Family

ID=5819877

Family Applications (1)

Application Number Title Priority Date Filing Date
US00288943A Expired - Lifetime US3810584A (en) 1971-09-17 1972-09-14 Grinding apparatus for fibrous material

Country Status (9)

Country Link
US (1) US3810584A (cs)
JP (1) JPS4857256A (cs)
AT (1) AT319729B (cs)
BR (1) BR7206432D0 (cs)
CA (1) CA971019A (cs)
DE (1) DE2146548C3 (cs)
FR (1) FR2154010A5 (cs)
GB (1) GB1406815A (cs)
IT (1) IT964370B (cs)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3893631A (en) * 1974-07-17 1975-07-08 Sprout Waldron & Co Inc Twin refiner with double floating discs
US4402463A (en) * 1980-09-05 1983-09-06 Escher Wyss Gmbh Grinding apparatus for a suspension of fibres for paper manufacturing
US4535941A (en) * 1981-10-29 1985-08-20 The Goodyear Tire & Rubber Company Method of comminuting elastomeric pellets
US4614310A (en) * 1981-10-29 1986-09-30 The Goodyear Tire & Rubber Company Comminuting apparatus with fluid cylinder rotor and stator biasing
US4621773A (en) * 1984-11-21 1986-11-11 The Goodyear Tire & Rubber Company Operation and control system for comminution equipment
US5289978A (en) * 1991-07-08 1994-03-01 Lundquist Lynn C Apparatus for continuous container label removal

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2930534A (en) * 1957-02-13 1960-03-29 Black Clawson Co Paper machinery
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
US3158333A (en) * 1960-11-08 1964-11-24 Defibrator Ab Grinding apparatus for fibrous materials
US3212721A (en) * 1961-09-22 1965-10-19 Defibrator Ab Grinding apparatus for treating fibrous material
US3717308A (en) * 1972-03-06 1973-02-20 Reinhall Rolf Grinding apparatus for fibrous material

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US2930534A (en) * 1957-02-13 1960-03-29 Black Clawson Co Paper machinery
US3158333A (en) * 1960-11-08 1964-11-24 Defibrator Ab Grinding apparatus for fibrous materials
US3212721A (en) * 1961-09-22 1965-10-19 Defibrator Ab Grinding apparatus for treating fibrous material
US3717308A (en) * 1972-03-06 1973-02-20 Reinhall Rolf Grinding apparatus for fibrous material

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3893631A (en) * 1974-07-17 1975-07-08 Sprout Waldron & Co Inc Twin refiner with double floating discs
US4402463A (en) * 1980-09-05 1983-09-06 Escher Wyss Gmbh Grinding apparatus for a suspension of fibres for paper manufacturing
US4535941A (en) * 1981-10-29 1985-08-20 The Goodyear Tire & Rubber Company Method of comminuting elastomeric pellets
US4614310A (en) * 1981-10-29 1986-09-30 The Goodyear Tire & Rubber Company Comminuting apparatus with fluid cylinder rotor and stator biasing
US4621773A (en) * 1984-11-21 1986-11-11 The Goodyear Tire & Rubber Company Operation and control system for comminution equipment
US5289978A (en) * 1991-07-08 1994-03-01 Lundquist Lynn C Apparatus for continuous container label removal

Also Published As

Publication number Publication date
GB1406815A (en) 1975-09-17
DE2146548B2 (cs) 1974-11-14
AT319729B (de) 1975-01-10
DE2146548A1 (de) 1973-03-22
CA971019A (en) 1975-07-15
FR2154010A5 (cs) 1973-05-04
JPS4857256A (cs) 1973-08-11
IT964370B (it) 1974-01-21
BR7206432D0 (pt) 1973-07-17
DE2146548C3 (de) 1975-12-18

Similar Documents

Publication Publication Date Title
DE3783775T2 (de) Hydrostatisches axiallagersystem.
DE60320596T2 (de) Spritzgiesseinheit mit einer antriebsanordnung zum drehen und translatorischen verschieben einer welle
US3810584A (en) Grinding apparatus for fibrous material
US3224244A (en) Swaging machine
US3510915A (en) Injection molding machine pressure balanced drive shaft
DE69621703T2 (de) Einspritzmechanismus für spritzgiessmaschine
US3908449A (en) Clamping device, especially for material testing machines
US3737109A (en) Double-acting axial thrust and radial bearings for grinding apparatus
US4934465A (en) Arrangement for the axial bearing of a drilling machine
EP1706648B1 (de) Antriebsvorrichtung
US4813263A (en) Forging machine
DE2105236A1 (de) Doppeltwirkender hydraulischer Servomotor
EP0440096B1 (de) Werkstückspindel-Anordnung für eine Drehmaschine
EP0618025B1 (de) Einpressaggregat
DE2159721B2 (de) Einrichtung zur Zylindrizitätskompensation an Schleifmaschinen
US3635388A (en) Friction welding apparatus
US3364716A (en) Extrusion apparatus
US3659474A (en) Worm gear for driving machine-tool slides, in particular in milling machines
DE1935019C3 (de) Vorrichtung zum Festklemmen der Werkzeugspindel einer Werkzeugmaschine
US3717308A (en) Grinding apparatus for fibrous material
US3166259A (en) Jaw crusher
DE2510852C3 (de) Scheibenraffineur zum Zerfasern von Fasermaterial
US4464924A (en) Swaging machine
US3176512A (en) Machine for running gears for testing or finishing
US3656334A (en) Forging machine