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WO1997030211A2 - Crible - Google Patents

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Publication number
WO1997030211A2
WO1997030211A2 PCT/FI1997/000104 FI9700104W WO9730211A2 WO 1997030211 A2 WO1997030211 A2 WO 1997030211A2 FI 9700104 W FI9700104 W FI 9700104W WO 9730211 A2 WO9730211 A2 WO 9730211A2
Authority
WO
WIPO (PCT)
Prior art keywords
screen
screen drum
ring
drum
flange
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.)
Ceased
Application number
PCT/FI1997/000104
Other languages
English (en)
Other versions
WO1997030211A3 (fr
Inventor
Risto Ljokkoi
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.)
Andritz Oy
Original Assignee
Andritz Oy
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8545477&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO1997030211(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Andritz Oy filed Critical Andritz Oy
Priority to EP97903406A priority Critical patent/EP0970276A2/fr
Publication of WO1997030211A2 publication Critical patent/WO1997030211A2/fr
Publication of WO1997030211A3 publication Critical patent/WO1997030211A3/fr
Priority to US09/135,009 priority patent/US5960962A/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/02—Straining or screening the pulp
    • D21D5/023—Stationary screen-drums
    • D21D5/026—Stationary screen-drums with rotating cleaning foils

Definitions

  • the present invention relates to a screen.
  • the invention relates to the structure of a screen used in the wood processing industry, providing an improvement in the working reliability and safety of the device.
  • the screens used in the wood processing industry are most often apparatus surrounded by substantially cylindrical outer housing having connections at least for the fiber suspension to be supplied to the apparatus, for the accepted fraction, or the so-called accept, to be discharged from the apparatus, and for the rejected fraction, or the so-called reject.
  • the apparatus may have connections for, for example, plastics separated in the apparatus and for dilution or washing liquid to be fed into the apparatus.
  • the apparatus is installed in an upright position so that the axis of the substantially cylindrical housing is vertical. Then the top of the apparatus is easy to open or detach from the essentially cylindrical housing and the apparatus may easily be maintained.
  • the shaft of the apparatus passes through the opposite end of the apparatus, i.e.
  • a preferred embodiment of the invention brings a simple and advantageous solution to this problem.
  • An essential feature of the approach according to the invention is that the securing bolts of the screen drum are locked non- turnable by a means locking several bolts at a time, preferably all the securing bolts of the screen drum.
  • An approach according to an other preferred embodiment of the invention eliminates these problems. In other words, it both allows replacing the cylinder without detaching the rotor, and it supports the cylinder in its place so that pressure pulses cannot move the screen cylinder.
  • Fig. l is a general illustration of a screen used in the wood processing industry
  • Figs. 2a and 2b illustrate, partly in section, a screen detail according to a preferred embodiment of the invention
  • Fig. 2c illustrates an alternative embodiment the function of which corresponds to that of Fig. 2b
  • Fig. 3 illustrates an other preferred embodiment which in principle corresponds to that of Fig. 2a;
  • Fig. 4 illustrates, partly in section, a screen detail according to an other preferred embodiment of the invention
  • Figs. 5a and 5b illustrate, partly in section, a screen detail according to a third preferred embodiment of the invention
  • Fig. 6 illustrates, partly in section, a screen detail according to a fourth preferred embodiment of the invention.
  • Fig. 7 illustrates, partly in section, a screen detail according to a fifth preferred embodiment of the invention
  • Fig. 8 illustrates, partly in section, a screen detail according to a sixth preferred embodiment of the invention.
  • Fig. 9 illustrates, partly in section, a screen detail according to a seventh preferred embodiment of the invention.
  • a screen mainly comprises an outer housing l, connections arranged therein for the pulp 2 to be fed in, for the accepted fraction, the so-called accept 3, and for the rejected fraction, the so-called reject 4.
  • Inside the outer housing there is a screen or sieve surface 5, and in the vicinity of the surface 5 there is provided a member 6, a so-called rotor movable in relation to the surface 5.
  • Figure 2 illustrates in detail how a screen drum is reliably secured in its place according to a preferred embodiment of the invention.
  • the figure illustrates only the top end 12 of the screen drum, its securing flange 14, an intermediate ring 16 secured/arranged to the housing of the screen, and a so-called impurity separator 18 and the actual securing bolts 20 of the screen drum.
  • the intermediate ring 16 includes in this embodiment an annular surface 162 parallel with the axis of the screen against which the guiding surface 142 of the securing flange 14 of the screen drum is tightly set. Guided by these two surfaces, the screen drum 5 is positioned centrally around the axis of the screen.
  • the hole in the securing flange 14 for the securing bolt 20 is a little loose so as to allow the axial guiding of the screen drum 5 to take place via the surfaces 142, 162 mentioned, only.
  • the screen drum 5 has been secured to the intermediate ring through its flange 14 by means of the bolts 20.
  • the same bolts were used to secure also the so-called impurity separator 18 which is an essentially cylindrical ring extending above the screen drum 5 and prevents very coarse impurities, such as for example stones, nuts and other such pieces, from entering the screening zone between the screen drum and the rotor 6 (see Fig. 1) .
  • Figure 2b illustrates that the securing flange 14 of the screen drum 12 first of all has an annular guide surface 19 for the impurity separator 18 for centering the impurity separator 18 centrally around the axis of the screen.
  • the figure also illustrates the securing flange 14 having a cylindrical recess 21 which partly opens to the cylindrical guide surface 19.
  • the idea is that when the screen drum is secured with the bolts 20 to the intermediate ring 16, one of the sides of the head of the hexagon head bolt substantially aligns with the guide surface 19 mentioned and is parallel with its tangent so that when the impurity separator 18 is installed in its place against the guide surface 19 it locks the securing bolt 20 of screen drum 12 unrotatable in its place.
  • the guide surface of the impurity separator may be arranged outside the periphery of the screen drum securing bolts, thus obtaining a corresponding locking of the bolts .
  • the lower part of an impurity separator 18, either the securing flange 22 of the impurity separator 18, or the lower part of the cylindrical piece itself, has been so shaped that it prevents the securing bolts 20 of the screen drum 5 from being unwound.
  • the securing flange 22 or at the lower end of the cylindrical piece there is a recess 23 which at least partly adapts to the form of the end of the securing bolt 20 and which locks the end of the securing bolt 20 non-turnable in its place.
  • the separator may be replaced by a plain ring, which is placed by the side of or on top of the circle of bolts securing the screen drum, depending on which of the embodiments, i.e. securing methods described above is chosen, and locks all the bolts non-turnable either in the way illustrated in Figs. 2b and 2c or in some other way.
  • a plain ring which is placed by the side of or on top of the circle of bolts securing the screen drum, depending on which of the embodiments, i.e. securing methods described above is chosen, and locks all the bolts non-turnable either in the way illustrated in Figs. 2b and 2c or in some other way.
  • these means form an annular ring on top of or by the side of the bolt circle but the inventive idea covers also other applications in which several bolts are locked in their places at a time.
  • the impurity separator 18 itself or the ring replacing it is secured in its place by separate securing bolts.
  • the total number of securing bolts used increases the load directed to the securing bolts of the impurity separator and the ring is negligible compared to the securing bolts 20 of the screen drum 5 and thus the tendency of these bolt to be unwound is also remarkably smaller.
  • Figure 3 illustrates an alternative of the embodiment of Fig. 2a in which the bolt 20 of Fig. 2a has been replaced by a so-called pin bolt 20' and the means to be locked in the embodiment of Fig. 3 is a nut 200 which corresponds to the head of the bolt 20 in Fig. 2a.
  • the nut may be locked non-turnable in its place by means of the impurity separator or a corresponding means as described above.
  • Figure 3 further illustrates a preferred but not indispensable additional alternative in which spring washers 202 have been provided in connection with the nut in the Fig. 3 embodiment, but in practise also separately, by means of which the securing flange 14 is pressed against the intermediate ring 16 of the screen.
  • the bolt 20' is not a so-called pin bolt but an ordinary bolt with a head which has been screwed down through the intermediate ring 16 so that the end of the bolt extends above the surface of the intermediate ring like the end of the pin bolt 20' .
  • the securing is carried out just as illustrated in Fig. 3.
  • advantage provided by this securing way is that when the bolt has for some reason broken off by the nut side the bolt may be screwed out of the hole in a conventional way after the screen drum has been removed.
  • the head of the bolt may be secured in its place for example by two welding spots so that the bolt cannot, if snapped, be wound off and end up in the accept.
  • FIG. 4 illustrates a way according to a preferred embodiment of the invention of supporting the screen drum 5 in its place without directing practically any compression stress at all to the screen drum.
  • the first way was to secure the screen drum with bolts at its top end, only, and to press the conical bottom end of the screen drum against the surface of the conical intermediate ring.
  • the screen drum was set centrally in its place by utilizing compression stress and thus it was easy to remove it from its place without having to detach the rotor located inside it.
  • the other way which was described in the U.S. patent mentioned, avoided the compression stress but brought the drawback of having to dismount the rotor at first before the screen drum could be detached and remove .
  • Fig. 4 shows how an intermediate ring 26 connected to the housing of the screen has been provided with a conical surface 262 opening upwards the angle of which is of the order of 5 - 25, preferably 10 - 20, and appropriately about 15 degrees.
  • the flange 28 of the lower end of the screen drum 5 has been provided with a conical surface 282 tapering downwards.
  • An annular groove 30 has been provided in the conical surface 282 of the screen drum 5 flange 28, substantially at the center region thereof, the depth of the groove being in most of the embodiments presented preferably of the order of 3 - 10 mm and the length preferably of the order of 5 - 15 mm depending on the dimensions of the ring/rings used, and the groove in turn being preferably provided with a ring 32 made of rubber of some other corresponding flexible material and preferably affixed.
  • the cross section of the ring 32 mentioned is preferably such that its surface 322, preferably conical, placed against the conical surface 262 of the intermediate ring 26 is relatively broad thus ensuring a good sealing between the surfaces 262 and 322.
  • the dimensions of the conical surface 262, 282 and 322 and the ring 32 have been chosen so as to have as little axial compression stress of the screen drum 5 as possible and to provide a guiding which centers the screen drum lower end in the radial direction as well as possible.
  • Figs. 5a and 5b illustrate a method of guiding the lower end of the screen drum according to another preferred embodiment of the invention.
  • the starting point is practically the same as in the embodiment of Fig. 4.
  • the only difference is that the flexible ring 42 has been affixed in this embodiment in the conical surface 262 of the intermediate ring 26 affixed in the housing of the screen.
  • the purpose is to cause the flexible ring 42 to be bent, when the screen drum is pushed in its place, into the groove 30 provided in the conical surface 282 of the screen drum lower end flange 28 into the position illustrated in Fig. 5b, and both to seal the space between the conical surfaces 262 and 282 efficiently and to center the screen drum exactly in the correct position.
  • Figure 6 illustrates a guiding method of the lower end of the screen drum 5 according to a third preferred embodiment of the invention.
  • the flexible ring 52 is a ring which is mainly made of for example rubber but has for example a metal ring 524 disposed in the middle of it, which remarkably stiffens the structure of the ring 52.
  • This kind of a ring 52 need not necessarily be affixed in the counter surfaces at all but the ring 52 stays in its place pressed by the metal ring 524, only.
  • Figure 7 illustrates a guiding method of the lower end of a screen drum 5 according to a fourth preferred embodiment of the invention.
  • a flexible ring 62 replaces the flange of the lower end of the screen drum 5.
  • the flexible ring 62 is placed in an annular groove (60) machined in the screen drum outer surface.
  • the function of the bands 624 and 626 is to stiffen the ring 62 particularly in the radial direction so that the ring 62, firstly, stays firmly in its groove 60 and, secondly, supports the screen drum 5 centrally in its place as well as possible.
  • Figure 8 illustrates a guiding method of the lower end of a screen drum 5 according to still a fifth preferred embodiment of the invention.
  • a ring 78 sliding in the axial direction has been provided at the lower end of the screen drum 5 the conical surface 782 of which is supported by the conical surface 262 of the intermediate ring 26.
  • a flexible ring or several flexible rings 72, preferably large 0 rings, have been provided between the screen drum 5 and the sliding ring 78, the rings pushing the sliding ring 78 downwards and causing it to be set tightly against the conical surface 262 of the intermediate ring 26.
  • Figure 9 illustrates a guiding method of the lower end of a screen drum 5 according to still a sixth preferred embodiment of the invention.
  • an annular groove 30 having a bottom surface 302 has been arranged in the conical surface 882 of a ring 88 at the lower end of the screen drum 5.
  • the bottom surface 302 is conical.
  • the surface 302 is preferably not parallel with the conical surface 882 but tapers downwards faster.
  • the conical surface 882 in turn preferably tapers downwards a little faster than the conical surface 262 of the intermediate ring 26 although these surface may be parallel, also.
  • the groove 30 has been provided with an O ring 82, preferably two O rings, preferably of rubber, so that when the screen drum is pushed downwards the ring/rings mentioned roll upwards along the bottom surface 302 of the groove 30 so that they are wedged between the bottom surface 302 of the groove and the conical surface 262 of the intermediate ring 26 and both seal the lower end of the screen drum 5 and center the drum exactly in its central place.
  • an O ring 82 preferably two O rings, preferably of rubber
  • An advantage provided by the conical forms, in which the coning angle of the conical surface 262 of the intermediate ring 26 is smaller than the coning angle of the lower end 28 of the screen drum or the coning angle of the bottom of the groove provided at the lower end, illustrated in most of the figures mentioned above is that there is a wedge-like space tapering towards the accept space provided between the surfaces mentioned.
  • the pressure inside the screen drum presses the member between the conical surfaces mentioned towards the more tapered end of the wedge-like space and thus the sealing ability of the member improves.
  • the sealing and support of the lower end of the screen drum is taken care of by two conical members so that a space is arranged between the two surfaces which space tapers in a wedge- like fashion towards the lower pressure, and a member sealing and supporting the lower end of the screen drum has been arranged in the space mentioned.
  • a structure of a new type has been developed which eliminates the drawbacks and problems of prior art apparatus.
  • only a few most preferred embodiments of the structure according to the invention have been presented above which in no way intend to limit the scope of protection of the invention from what has been defined in the appended patent claims.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Paper (AREA)

Abstract

La présente invention concerne un appareil de criblage constitué non seulement d'un carter extérieur équipé de raccords d'admission de la matière à traiter et d'évacuation de la matière traitée, mais aussi de pièces d'extrémités, et également d'un tambour stationnaire de criblage (5) monté dans le carter (1) et dont la collerette (14) d'extrémité supérieure est boulonnée (20) sur une structure annulaire intermédiaire (16) de sorte que le carter (1) soutient le tambour via la structure annulaire intermédiaire (16). L'appareil comporte enfin un rotor à mouvement rotatif (6) monté à l'intérieur du tambour de criblage. La caractéristique de l'appareil de criblage est que les têtes de boulon (20) sont verrouillées en position de non rotation au moyens d'organes (18, 22) en appui sur un côté au moins d'une telle tête de boulon.
PCT/FI1997/000104 1996-02-19 1997-02-18 Crible Ceased WO1997030211A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP97903406A EP0970276A2 (fr) 1996-02-19 1997-02-18 Crible
US09/135,009 US5960962A (en) 1996-02-19 1998-08-17 Screen

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI960739 1996-02-19
FI960739A FI101235B (fi) 1996-02-19 1996-02-19 Lajitin

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US09/135,009 Continuation US5960962A (en) 1996-02-19 1998-08-17 Screen

Publications (2)

Publication Number Publication Date
WO1997030211A2 true WO1997030211A2 (fr) 1997-08-21
WO1997030211A3 WO1997030211A3 (fr) 1997-10-09

Family

ID=8545477

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1997/000104 Ceased WO1997030211A2 (fr) 1996-02-19 1997-02-18 Crible

Country Status (4)

Country Link
EP (1) EP0970276A2 (fr)
CA (1) CA2246677A1 (fr)
FI (1) FI101235B (fr)
WO (1) WO1997030211A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999033542A1 (fr) * 1997-12-23 1999-07-08 Ontario Hydro Systeme de filtration
AT412788B (de) * 2003-10-15 2005-07-25 Andritz Ag Maschf Sieb- bzw. sortiervorrichtung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3240487C2 (de) * 1982-11-02 1986-03-06 Naučno-issledovatel'skij i proektno-konstruktorskij institut celljuloznogo mašinostroenija "NIICMAŠ", Petrozavodsk Drucksichter für Fasersuspensionen
FI67589C (fi) * 1983-10-25 1985-04-10 Ahlstroem Oy Sorterare med separering av laett rejekt
DE3503241A1 (de) * 1985-01-31 1986-08-07 J.M. Voith Gmbh, 7920 Heidenheim Sortierer, insbesondere vertikalsichter
SE464473B (sv) * 1988-11-17 1991-04-29 Sunds Defibrator Ind Ab Silanordning
US5072834A (en) * 1990-11-19 1991-12-17 The Black Clawson Company Screening apparatus for paper making stock
SE500893C2 (sv) * 1993-02-10 1994-09-26 Sunds Defibrator Ind Ab Trycksilanordning

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999033542A1 (fr) * 1997-12-23 1999-07-08 Ontario Hydro Systeme de filtration
AT412788B (de) * 2003-10-15 2005-07-25 Andritz Ag Maschf Sieb- bzw. sortiervorrichtung

Also Published As

Publication number Publication date
CA2246677A1 (fr) 1997-08-21
FI101235B1 (fi) 1998-05-15
FI960739L (fi) 1997-08-20
FI960739A0 (fi) 1996-02-19
FI101235B (fi) 1998-05-15
EP0970276A2 (fr) 2000-01-12
WO1997030211A3 (fr) 1997-10-09

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