CA2478566A1 - Screen - Google Patents
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- Publication number
- CA2478566A1 CA2478566A1 CA002478566A CA2478566A CA2478566A1 CA 2478566 A1 CA2478566 A1 CA 2478566A1 CA 002478566 A CA002478566 A CA 002478566A CA 2478566 A CA2478566 A CA 2478566A CA 2478566 A1 CA2478566 A1 CA 2478566A1
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- CA
- Canada
- Prior art keywords
- screen
- screen cylinder
- housing
- cylinder
- axial direction
- 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.)
- Abandoned
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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
- D21D5/16—Cylinders and plates for screens
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/18—Drum screens
- B07B1/20—Stationary drums with moving interior agitators
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Combined Means For Separation Of Solids (AREA)
- Paper (AREA)
Abstract
A screen for cleaning or screening pulp suspension, the screen including a housing, a rotor and a screen cylinder, the screen cylinder having screen wires mounted at predetermined intervals between one another in the axial direction of the screen cylinder to form a cylindrical screen surface, the screen wires being fastened to circular supporting bars and the ends of the screen cylinder are provided with end rings of the screen cylinder, from which end rings the screen cylinder are arranged in connection with the housing of the screen, wherein the end ring is provided with at least one groove in the axial direction of the screen cylinder and the housing of the screen is provided with at least one wedge in the axial direction of the screen cylinder or the end ring is provided with at least one wedge in the axial direction of the screen cylinder and the housing of the screen is provided with at least one groove in the axial direction of the screen cylinder. The groove includes at least one plane surface substantially in the axial direction of the screen cylinder and the wedge includes at least one plane surface substantially in the axial direction of the screen cylinder. The wedge is arranged in the groove such that the plane surface on the wedge is arranged against the plane surface in the groove, whereby the plane surface on the wedge and the plane surface in the groove are arranged to be supported against one another to prevent the screen cylinder from rotating in relation to the housing of the screen.
Description
' CA 02478566 2004-08-18 ~s SCREEN
BACKGROUND OF THE INVENTION
[0001] The invention relates to a screen for cleaning or screening pulp suspension, the screen comprising a housing, a rotor rotatably arranged in connection with the housing and a screen cylinder immovably arranged in connection with the housing, the screen cylinder comprising screen wires mounted at predetermined intervals between one another in the axial direction of the screen cylinder to form a cylindrical screen surface, the screen wires being fastened to circular supporting bars and the ends of the screen cylinder are provided with end rings of the screen cylinder, from which end rings the screen cylinder is arranged in connection with the housing of the screen.
BACKGROUND OF THE INVENTION
[0001] The invention relates to a screen for cleaning or screening pulp suspension, the screen comprising a housing, a rotor rotatably arranged in connection with the housing and a screen cylinder immovably arranged in connection with the housing, the screen cylinder comprising screen wires mounted at predetermined intervals between one another in the axial direction of the screen cylinder to form a cylindrical screen surface, the screen wires being fastened to circular supporting bars and the ends of the screen cylinder are provided with end rings of the screen cylinder, from which end rings the screen cylinder is arranged in connection with the housing of the screen.
[0002] The invention further relates to a :screen cylinder for a screen intended for cleaning and screening pulp suspension, the screen cylinder comprising screen wires mounted at predetermined intervals between one an-other in the axial direction of the screen cylinder to form a cylindrical screen surface, the screen wires being fastened to circul<~r supporting bars and the ends of the screen cylinder are provided with end rings of the screen cylinder, from which end rings the screen cylinder can be arranged in connection with a housing of the screen.
j0003] Screens are used to clean and screen pulp suspension. A
screen comprises a housing, a rotor rotatably arranged in relation to the hous-ing and a screen cylinder provided with screen wires in the axial direction of the screen cylinder arranged at predetermined intervals between one another and mounted on circular supporting bars, the screen wires forming a cylindrical screen surface of the screen. The screen surface can be made for instance by fastening parallel screen wires forming the screen aurface adjacent to one an-other in a cylindrical shape so that a slot of a desired size remains between them. Generally this is carried out by welding or brazing the screen wires with circular supporting wires or supporting bars. The screen wires may be fastened to the supporting bars in the direction of fhe radius of the screen cylinder inside or outside the supporting bars. fn order to reinforce the structure of the screen cylinder separate supporting rings can be fastened to at least some of the cir-cular supporting bars to further reinforce the structure of the screen cylinder.
Such supporting rings are fastened either onto the inner circumference of the supporting bars or onto the outer circumference of the supporting bars depend-' CA 02478566 2004-08-18 ing on the order among the screen wires and the supporting bars in the direc-tion of the radius of the screen cylinder. The structure of the screen cylinder also comprises end rings to be mounted at the ends of the screen cylinder, from which end rings the screen cylinder is fastened or supported to the hous-ing of the screen so that the screen cylinder is not able to move in respect of the housing.
[0004' In order to support the screen cylinder the housing of the screen is known to be provided with what is known as a pin/slot mounting. The pinlslot mounting comprises a pin of circular shape iin cross section fastened to the outer circumference of the end ring and extending outwards from the end ring. The longitudinal axis of the pin is perpendicuG~r in relation to the longitu-dinal axis of the screen cylinder. The housing of the screen comprises a cover and the surface thereof facing the inside of the screen is in turn provided with a counterpart for the above-mentioned pin. The counterpart comprises a horizon-tal part fastened to the inner surface of the cover of the screen and vertical parts perpendicularly fastened to the horizontal part, and an opening or a slot of rectangle shape in cross section arranged between the vertical parts. When assembling the screen, the cover of the screen is mounted in position such that the pin fastened to the end ring is placed in tf ie slot between the vertical parts of the counterpart. tine or more of such pinlslot mountings may have been arranged on the cover of the screen. Using a corresponding pinlslot mounting the screen cylinder is supported on the housing of the screen also through the end ring at the opposite end of the screen cylinder in order to re-duce the load putting stress on a single fastening point. The pin is then fas-tened to the end ring and the slot to a flange part fixedly associated with the housing.
[0005 However, the pin/slot mounting is somewhat vulnerable to damage. When using the screen, the rotor tends to rotate the screen cylinder in relation to the housing of the screen, whereby a force is placed upon the slot structure through the pin fastened to the end ring. <~uch a force tends to break the structure of the slot and causes inconvenient ipermanent deformations to the pin and the slot functioning as the counterpart pair, and may cause the pin to break. The circular cross section of the pin allows forming what is known as a line contact between the pin and the slot, meaning that the affecting force being transferred from the screen cylinder through the pin to the slot is placed upon a very small area in the slot, thus increasing the inconvenient effect of said force.
[0006] US publication 5 326 470 discloses how a screen basket is supported on the housing structure of the screen using a bolt or pin mounting in the axial direction of the screen basket. However, such a fastening is not necessarily the most reliable way to support thE: screen basket when the screen is being used owing to the possibly very powerful forces affecting the fastening.
BRIEF DESCRIPTION OF THE INVENTION
[0007] It is an object of the present invention to provide a screen that is more durable than the previous ones.
[0008] The screen according to the invention is characterized in that the end ring is provided with at least one groove in the axial direction of the screen cylinder and the housing of the screen is provided with at least one wedge in the axial direction of the screen cylinder or the end ring is provided with at least one wedge in the axial direction of tlhe screen cylinder and the housing of the screen is provided with at least one groove in the axial direction of the screen cylinder and that said groove comprises at least one plane sur-face substantially in the axial direction of the screen cylinder and that said wedge comprises at least one plane surface substantially in the axial direction of the screen cylinder, and that said wedge is arranged in said groove such that the plane surface on the wedge is arranged against the plane surface in the groove, whereby the plane surface on the wedge and the plane surface in the groove are arranged to be supported against one another to prevent the screen cylinder from rotating in relation to the housing of the screen.
[0009] The screen cylinder according to the invention is character-ized in that the end ring of the screen cylinder is provided with at least one groove in the axial direction of the screen cylinder that can be arranged in con-nection with at least one wedge in the axial direction of the screen cylinder ar-ranged in connection with the housing of the screen or that the end ring of the screen cylinder is provided with at least one wedges in the axial direction of the screen cylinder that can be arranged in connection with at least one groove in the axial direction of the screen cylinder arranged in connection with the hous-ing of the screen and that said groove arranged in connection with the end ring of the screen cylinder comprises at least one plane surface substantially in the axial direction of the screen cylinder that can be arranged in connection with a plane surface substantially in the axial direction of the screen cylinder on the wedge arranged in connection with the housing of the screen such that the plane surface of the wedge is arranged against the plane surface of the groove, whereby the plane surfaces are arranged to be supported against one another and to prevent the screen cylinder from rotating in relation to the hous-ing of the screen, or that said wedge arranged in connection with the end ring of the screen cylinder comprises at least one plane surface substantially in the axial direction of the screen cylinder that can be arranged in connection with the plane surface substantially in the axial direction of the screen cylinder in the groove arranged in connection with the housing of the screen such that the plane surface of the wedge is arranged against the plane surface of the groove, whereby the plane surfaces are arranged to be supported against one another and to prevent the screen cylinder from rotating in relation to the hous-ing of the screen.
[0010] In accordance with an essential idea of the invention the screen cylinder is arranged from the end rings thereof in connection with the housing of the screen so that the end ring is provided with at least one recess in the axial direction of the screen cylinder and the housing of the screen is provided with at least one projection in the axial direction of the screen cylinder or the end ring is provided with at least one projection in the axial direction of the screen cylinder and the housing of the screen is provided with at least one recess in the direction of the screen cylinder, and the recess comprises at least one plane surface substantially in the axial direction of the screen cylinder and the projection comprises at least one plane surface substantially in the axial direction of the screen cylinder, and that said projection is arranged into said recess such that the plane surface on the projectiion is arranged against the plane surface in the recess, whereby the plane surface on the projection and the plane surface in the recess are arranged to be supported against one an-other, thus preventing the screen cylinder from rotating in relation to the hous-ing of the screen, and said recess is a groove and said projection is a wedge.
[0011] Thus, the projection or the recess in connection with the end ring and the projection or the recess in connection with the housing of the screen refer to either the projection or the recess directly in the end ring or in the housing of the screen or the projection or the recess in a part arranged in connection with the end ring or the housing of the screen.
[0012] The invention provides such an advantage that when the plane surface on the projection is supported on the plane surface in the recess or vice versa a planar contact is created between the projection and ,the re-cess, where the forces caused by the screen cylinder showing a tendency to rotate while using the screen are divided into a broader area than previously.
The structure of the screen therefore becomes rmore durable than before.
When the recess forms a slot that is of circular shape in cross section and when the projection forms a pin that is of circular shape in cross section corre-sponding to the hole, said projection and recess can easily be made and thus the support in question can easily be implemented. However, what can be achieved when the recess is a groove and the projection is a wedge is planar support surfaces provided with greater surface areas than the previous ones, i.e. said planar surfaces. Thus, the above-mentioned forces caused by the screen cylinder that tends to rotate while using the screen, are divided into a very broad area in the joint.
BRIEF DESCRIPTION OF THE DRAWINGS
[0013] In the following the invention will be described in greater de-tail by means of the preferred embodiments with reference to the accompany-ing drawings, in which Figure 1 schematically shows a screen in cross section and viewed from the end of the screen, Figure 2 schematically shows the screen of Figure 1 viewed from the axial direction thereof and in cross section, Figure 3 schematically shows a second E=nd of the screen of Figure 2 viewed from the axial direction and in cross section, Figure 4 schematically shows a second :acreen viewed from the ax-ial direction thereof and in cross section, Figure 5 shows a part of the screen shown in Figure 4 in cross sec-Lion, Figure 6 schematically shows a third screen viewed from the axial direction thereof and in cross section, and Figure 7 shows a part of the screen shown in Figure 6 in cross sec-tion.
[0014 For clarity, the Figures illustrate the invention in simplified form. Similar parts are indicated in the Figures with same reference numerals.
DETAILED DESCRIPTION OF THE INVENTION
[00153 Figure 1 schematically shows a screen 1 for cleaning or screening pulp suspension and a screen cylinder 2 supported on a housing 7 thereof viewed from the end thereof and in cross section, and Figures 2 and 3 schematically show the screen 1 and screen cylinder 2 shown in Figure 1 in the axial direction thereof in cross section. In Figure 2 the screen 1 is shown from the part of the screen cylinder 2, from where pulp is supplied to the screen 1. Figure 3 in turn shows the screen 1 from the point of the screen cyl-inder 2, where reject is discharged from the screen cylinder 2. The inner sur-face of the screen cylinder 2 is provided with screen wires 3 arranged about the entire inner circumference of the screen cylinder 2 to form a screen sur-face. What are found between the screen wires 3 are screen slots, through which liquid and a desired .part of the fibres are allowed to flow outside the screen cylinder 2 at the same time as slivers and excessively large fibres, bundles of fibres and other assorted pulp remain nn the inner surface of the screen cylinder 2 to be removed at the other end thereof. The screen wires 3 are fastened to supporting wires 4 or to supporting bars 4 before the support-ing bars 4 are bent into circular shape so that a screen cylinder 2 having an appropriately sized diameter is formed. The screE:n cylinder 2 may also be made so that the screen wires 3 are fastened onto the inner circumference of the supporting bars 4 bent already in advance into the shape of a circle. The supporting bars 4 are placed at appropriate intervals in the axial direction of the screen cylinder 2 such that the screen wires 3 remain rigidly and firmly in position. The screen wires 3 can be fastened to the supporting bar 4 by weld-ing, but the pressure at the inner edge of the supporting bar 4 caused by the bending of the supporting bar 4 assists the screen wires 3 to remain fastened.
Instead of welding the screen wires 3 can be attached to the supporting bar 4 also using a crimp joint. Supporting rings 5 can also be mounted around the supporting bars 4. The supporting rings 5 support the supporting bars 4 and receive in the screen cylinder 2 the forces achieved by the pressure difference caused by the different varying pressures at the different sides of the screen surface thereof.
[00163 The screen cylinder 1 is further provided with end rings 6 that allow supporting the screen cylinder 2 on the housing 7. In Figure 2, the end ring 6 is fastened to the screen cylinder 2 such that a shrink fit is placed be-tween the supporting bar 4 closest to the erids of irhe screen wires 3 and the end ring 6. A force acts on the shrink fit that perpendicularly affects the axis of the screen cylinder 2 and that extends from the direction of the outer circum-ference of the end ring 6 to the direction of the supporting bar 4. Such an af-fecting force thus locks the screen surface formed of the screen wires 3 through the supporting bar 4 to be substantially stationary in relation to the end ring 6. The screen surface formed of the screen wires 3 can be locked in re-spect of the end ring 6 also by welding the ends of the screen wires 3 to the end ring 6. Such an alternative is shown in Figure 4, in which the ends of the screen wires 3 are fastened using welds 8 to the end ring 6. For clarity, the Figures also show arrow R parallel to the radius of i:he screen cylinder 2 that is directed to point from the axial direction of the screen cylinder 2 to the direction of the outer circumference of the screen cylinder 2.
[0017] The screen 1 is also provided with a rotor 9, in which a plate is placed on the inner side of the screen surface of the screen 1 at a prede-termined distance from the screen surface. The rotor 9 is rotated by a motor that is not shown in the Figures for the sake of clarity, thus mixing the pulp suspension in the screen cylinder 2. At the same time the rotor 9 cleans the screen surface of the screen cylinder 2 of sliver and fibre layers thickened thereto.
[0018] Figures 2 and 3 also show schematically an embodiment for fastening the screen cylinder 2 to the housing 7 of the screen 1. Figure 2 thus illustrates how the screen cylinder 2 is supported on the housing 7 of the screen 1 at the end of the screen cylinder 2, from where pulp is supplied to the screen cylinder 2, and Figure 3 shows how the screen cylinder 2 is supported at the end of the housing 7 of the screen 1, from where reject is discharged from the screen cylinder 2. What characterizes the fastening of the screen cyl-inder 2 to the housing 7 of the screen 1 at both ends of the screen cylinder 2 is that the screen cylinder 2 is fastened to the housing 7 of the screen 1 using a projectionlrecess mounting in the axial direction of the screen cylinder 2 be-tween the housing 7 and the end ring 6. In Figures 2 and 3, the end rings 6 of the screen cylinder 2 are provided with one or more recesses in the axial direc-tion of the screen cylinder 2, to which recess a corresponding projection in the axial direction of the screen cylinder 2 can be directed. In Figures 2 and 3 the recess in the axial direction of the screen cylinder ;? is formed of a slot 11 that is of circular shape in cross section formed in the end ring 6. Instead of the slot 11 a hole extending through the end ring 6 could also be used. In Figures 2 and 3 the projection in the axial direction of the screen cylinder 2 is formed of a pin 13 or a screw 13 fastened to the housing 7 of the screen 1 that is directed to the slot 11 when assembling the screen 1. In Figure 2 the pin 13 is fastened to a cover part 12 of the housing 7 of the screen 1 by welding and in Figure 3 the pin 13 is fastened to a flange part 14 of the housing 7 of the screen 1.
The inner surface of the slot 11 forms a plane surface A of the recess substantially in the axial direction of the screen cylinder 2, the plane surface A being arched in the direction of the circumference of the screen cylinder 2. The outer surface or the outer circumference of the pin 13 or the screw 13 forms a plane surface B of the projection substantially in the axial direction of the screen cylinder 2, and the plane surface B also being arched in the direction that is perpendicular to the axis of the screen cylinder 2. When using the screen 1 the plane surface A of the recess or the slot 11 substantially in the axial direction of the screen cylinder 2 is supported on the plane surface B of the projection i.e. the pin substantially in the axial direction of the screen cylinder 2, thus preventing the screen cylinder 2 from rotating in relation to the housing 7 of the screen 1 when employing the screen 1.
[0019] The solution provides such an advantage that when the plane surFace B on the projection is supported on the plane surface A in the recess or vice versa, the force. that tends to rotate the screen cylinder 2 in rela-tion to the housing of the screen 1 is conveyed whE;n using the screen 1 to the housing 7 of the screen 1 through the plane surfaces A and B in the recess and projection. What can therefore be found between tine projection and the recess is what is known as a planar contact that allows the forces conveyed when in contact to be divided within the area of the touching surfaces into a broader area, whereby the structure of the screen thus becomes more durable than previously.
[0020 In Figure 3 the pin 13 is fastened by welding to a hole in the flange part 14 of the housing 7 of the screen 1. When mounting the screen cyl-inder 2 to the housing 7 of the screen 1, the slots 11 formed on the surface facing the flange part 14 in the end ring 6 are positioned at the pins 13 and the screen cylinder 2 is placed in position such that the pins 13 are inserted into the slots 11 in the end rings 6. The projectionlrecess mounting shown in Figure 3 can therefore be used also to direct the screen cylinder 2 into position in the housing 7 of the screen 1, but the particular aim of the projectionlrecess mounting in the axial direction of the screen cylinder 2 shown is to prevent the screen cylinder 2 from rotating in relation to the housing 7 of the screen 1 when using the screen 1.
[0021] Figure 2 shows how the screen cylinder 2 is supported on the cover part 12 of the housing 7 of the screen 1. In the solution shown in Figure 2, the end ring 6 is provided with a slot 11 on the surface in the direction of the cover part 12 of the housing 7 of the screen 1, in which slot 11 a pin is placed that is fastened by welding to the hole through the cover part 12.
The cover part 12 is in turn fastened to the housing 7 of the screen 1 for instance using a bolt fastening 15. The projectionlrecess mounting allows setting the cover part 12 of the housing 7 of the screen 1 accurately into position, but the primary aim of the projection/recess mounting in the axial direction of the screen cylinder 2 is to prevent the screen cylinder 1 from rotating in relation to a screen basket 2.
[0022] In Figures 2 and 3 the pins are arranged in the cover part 12 and the flange part 14 of the housing 7 of the screen 1 and the slots 11 are in turn formed in the end ring 6, but the projectionlrecess mounting in question can also be implemented vice versa so that the pins 13 are arranged in con-nection with the end rings 6 and the slots 11 are formed in the cover part 12 and the flange part 14 of the housing 7 of the screen 1. Instead of pins 13, pro-jections formed in the end ring 6, the cover part 12 or the flange part 14 during the manufacturing process thereof can be made, said projections being made of the same material and forming a uniform structure with the parts concerned.
The slot 11 and the pin 13, which are of circular shape in cross section, may naturally be replaced by slots and pins that are of quadrangle or polygon shape in cross section, but a slot that is of angular shape in cross section is, however, more difficult to manufacture.
[0023] Figures 4 and 5 schematically sl~tow a second embodiment for fastening the screen cylinder 2 to the housing '7 of the screen 1. Figure illustrates how the screen cylinder 2 is supported on the housing 7 of the screen 1 at the end of the screen cylinder 2, from where pulp is supplied to the screen cylinder 2 and Figure 5 shows said fastening at cross section D shown in Figure 4. In the embodiment shown in Figure:> 4 and 5, a groove 16 is formed in the end ring 6; the groove thus forming a recess in the axial direction of the screen cylinder 2 provided with a plane surface A in the axial direction of the screen cylinder 2. Preferably the longer side of the groove 16 is arranged to move in parallel with the radius of the screen cylinder 2. The cover part 12 of ' CA 02478566 2004-08-18 1~
the housing 7 of the screen 1 is in turn provided with a wedge 17, which may be a separate wedge fastened to the cover part 12 for instance by welding or using a screw fastening or a wedge arranged to form a uniform part with the cover part 12 during the manufacturing thereof. The wedge 17 thus forms a projection in the axial direction of the screen cylinder 2, the projection being provided with a plane surface B in the axial direction of the screen cylinder 2.
When mounting the cover part 12 of the housing T into position, one or more wedges 17 in the cover part 12 are directed into one or more grooves 16 in the end ring 6. When employing the screen 1 the plane surface A of the groove 16 in the end ring 6 is supported on the plane surtace B of the wedge 17 in the cover part 12 of the housing 7 of the screen 1, thus preventing the screen cyl-inder 2 from rotating in relation to the housing of the screen 1.
[0024 The embodiment shown in Figures 4 and 5, where the pro-jection/recess mounting is implemented by means of the wedge 17 and the groove 16, enables to achieve support surfaces with a larger surface area than in the projection/recess mounting based on the slot 11 and the pin 13. Thus, the forces brought about to the mounting that are caused by the screen cylin-der 2 having the tendency to rotate when using the screen 1 are directed to a broader area in the mounting, whereupon the mounting becomes more dura-ble. The fastening solution based on the groove 15 and the wedge 17 allows implementing the fastening solution determined for a certain total load with a smaller number of fastening points than the fastening solution based on the slot 11 and the pin 13. The fastening solution according to Figures 4 and 5 may naturally also be used at the end of the screen cylinder 2, from where re-ject is discharged from the screen cylinder 2.
[0025 Figures 6 and 7 schematically shows a third embodiment for fastening the screen cylinder 2 to the housing 7 of the screen1. Figure 6 shows how the screen cylinder 2 is supported on the housing 7 of the screen 1 at the end of the screen cylinder 2, from where pulp is supplied to the screen cylinder 2, and Figure 7 shows said fastening at cross section E shown in Figure 6. In the embodiment shown in Figures 6 and 7 the end ring 6 is provided with the groove 16 that forms the recess in the axial direction of the screen cylinder 2, the recess being provided with the plane surface A in the axial direction of the screen cylinder 2: The wedge 17 is arranged in this solution to the cover part 12 of the housing 7 of the screen 1 using a fastening flange 18. The fastening flange 18 is, like the end ring 6, provided with a corresponding groove for the wedge 17. However, the wedge groove in the fastening flange 18 is lower than the wedge groove 16 in the end ring 6. The wedge 17 is arranged into a groove in the fastening flange 18 and the fastening flange 18 and the wedge 17 are fastened to the cover part 12 for instance by means of screws. The wedge 17 thus forms a projection in the axial direction of the screen cylinder provided with the plane surface B in the axial direction of the screen cylinder 2.
When mounting the cover part 12 of the housing 7 into position, one or more wedges 17 in the cover part 12 are directed into position ire one or more grooves 16 in the end ring 6. When employing the screen 1 the plane surface A of the groove 16 in the end ring 6 is supported on the plane surface B of the wedge 17 coupled using the fastening flange 18 to the cover part 12 of the housing 7 of the screen 1, thus preventing the screen cylinder 2 from rotating in relation to the housing of the screen 1. The fastening solution shown in Fig-ures 6 and 7 may naturally be used at the end of the screen cylinder 2, from where reject is discharged from the screen cylinder 2.
[00261 The drawing and the specification associated therewith are merely intended to illustrate the idea of the invention. The details of the inven-tion may vary within the scope of the claims. The structure of the screen cylin-der 2 shown in Figures 1 to 7 is such where the supporting bars 4 and the supporting rings 5 supporting the screen surface formed of the screen wires 3 are placed outside the screen surface, but the fastening according to the solu-tion may naturally also be used in such screens; where the supporting bars 4 and the supporting rings 5 are inside the screen surface.
j0003] Screens are used to clean and screen pulp suspension. A
screen comprises a housing, a rotor rotatably arranged in relation to the hous-ing and a screen cylinder provided with screen wires in the axial direction of the screen cylinder arranged at predetermined intervals between one another and mounted on circular supporting bars, the screen wires forming a cylindrical screen surface of the screen. The screen surface can be made for instance by fastening parallel screen wires forming the screen aurface adjacent to one an-other in a cylindrical shape so that a slot of a desired size remains between them. Generally this is carried out by welding or brazing the screen wires with circular supporting wires or supporting bars. The screen wires may be fastened to the supporting bars in the direction of fhe radius of the screen cylinder inside or outside the supporting bars. fn order to reinforce the structure of the screen cylinder separate supporting rings can be fastened to at least some of the cir-cular supporting bars to further reinforce the structure of the screen cylinder.
Such supporting rings are fastened either onto the inner circumference of the supporting bars or onto the outer circumference of the supporting bars depend-' CA 02478566 2004-08-18 ing on the order among the screen wires and the supporting bars in the direc-tion of the radius of the screen cylinder. The structure of the screen cylinder also comprises end rings to be mounted at the ends of the screen cylinder, from which end rings the screen cylinder is fastened or supported to the hous-ing of the screen so that the screen cylinder is not able to move in respect of the housing.
[0004' In order to support the screen cylinder the housing of the screen is known to be provided with what is known as a pin/slot mounting. The pinlslot mounting comprises a pin of circular shape iin cross section fastened to the outer circumference of the end ring and extending outwards from the end ring. The longitudinal axis of the pin is perpendicuG~r in relation to the longitu-dinal axis of the screen cylinder. The housing of the screen comprises a cover and the surface thereof facing the inside of the screen is in turn provided with a counterpart for the above-mentioned pin. The counterpart comprises a horizon-tal part fastened to the inner surface of the cover of the screen and vertical parts perpendicularly fastened to the horizontal part, and an opening or a slot of rectangle shape in cross section arranged between the vertical parts. When assembling the screen, the cover of the screen is mounted in position such that the pin fastened to the end ring is placed in tf ie slot between the vertical parts of the counterpart. tine or more of such pinlslot mountings may have been arranged on the cover of the screen. Using a corresponding pinlslot mounting the screen cylinder is supported on the housing of the screen also through the end ring at the opposite end of the screen cylinder in order to re-duce the load putting stress on a single fastening point. The pin is then fas-tened to the end ring and the slot to a flange part fixedly associated with the housing.
[0005 However, the pin/slot mounting is somewhat vulnerable to damage. When using the screen, the rotor tends to rotate the screen cylinder in relation to the housing of the screen, whereby a force is placed upon the slot structure through the pin fastened to the end ring. <~uch a force tends to break the structure of the slot and causes inconvenient ipermanent deformations to the pin and the slot functioning as the counterpart pair, and may cause the pin to break. The circular cross section of the pin allows forming what is known as a line contact between the pin and the slot, meaning that the affecting force being transferred from the screen cylinder through the pin to the slot is placed upon a very small area in the slot, thus increasing the inconvenient effect of said force.
[0006] US publication 5 326 470 discloses how a screen basket is supported on the housing structure of the screen using a bolt or pin mounting in the axial direction of the screen basket. However, such a fastening is not necessarily the most reliable way to support thE: screen basket when the screen is being used owing to the possibly very powerful forces affecting the fastening.
BRIEF DESCRIPTION OF THE INVENTION
[0007] It is an object of the present invention to provide a screen that is more durable than the previous ones.
[0008] The screen according to the invention is characterized in that the end ring is provided with at least one groove in the axial direction of the screen cylinder and the housing of the screen is provided with at least one wedge in the axial direction of the screen cylinder or the end ring is provided with at least one wedge in the axial direction of tlhe screen cylinder and the housing of the screen is provided with at least one groove in the axial direction of the screen cylinder and that said groove comprises at least one plane sur-face substantially in the axial direction of the screen cylinder and that said wedge comprises at least one plane surface substantially in the axial direction of the screen cylinder, and that said wedge is arranged in said groove such that the plane surface on the wedge is arranged against the plane surface in the groove, whereby the plane surface on the wedge and the plane surface in the groove are arranged to be supported against one another to prevent the screen cylinder from rotating in relation to the housing of the screen.
[0009] The screen cylinder according to the invention is character-ized in that the end ring of the screen cylinder is provided with at least one groove in the axial direction of the screen cylinder that can be arranged in con-nection with at least one wedge in the axial direction of the screen cylinder ar-ranged in connection with the housing of the screen or that the end ring of the screen cylinder is provided with at least one wedges in the axial direction of the screen cylinder that can be arranged in connection with at least one groove in the axial direction of the screen cylinder arranged in connection with the hous-ing of the screen and that said groove arranged in connection with the end ring of the screen cylinder comprises at least one plane surface substantially in the axial direction of the screen cylinder that can be arranged in connection with a plane surface substantially in the axial direction of the screen cylinder on the wedge arranged in connection with the housing of the screen such that the plane surface of the wedge is arranged against the plane surface of the groove, whereby the plane surfaces are arranged to be supported against one another and to prevent the screen cylinder from rotating in relation to the hous-ing of the screen, or that said wedge arranged in connection with the end ring of the screen cylinder comprises at least one plane surface substantially in the axial direction of the screen cylinder that can be arranged in connection with the plane surface substantially in the axial direction of the screen cylinder in the groove arranged in connection with the housing of the screen such that the plane surface of the wedge is arranged against the plane surface of the groove, whereby the plane surfaces are arranged to be supported against one another and to prevent the screen cylinder from rotating in relation to the hous-ing of the screen.
[0010] In accordance with an essential idea of the invention the screen cylinder is arranged from the end rings thereof in connection with the housing of the screen so that the end ring is provided with at least one recess in the axial direction of the screen cylinder and the housing of the screen is provided with at least one projection in the axial direction of the screen cylinder or the end ring is provided with at least one projection in the axial direction of the screen cylinder and the housing of the screen is provided with at least one recess in the direction of the screen cylinder, and the recess comprises at least one plane surface substantially in the axial direction of the screen cylinder and the projection comprises at least one plane surface substantially in the axial direction of the screen cylinder, and that said projection is arranged into said recess such that the plane surface on the projectiion is arranged against the plane surface in the recess, whereby the plane surface on the projection and the plane surface in the recess are arranged to be supported against one an-other, thus preventing the screen cylinder from rotating in relation to the hous-ing of the screen, and said recess is a groove and said projection is a wedge.
[0011] Thus, the projection or the recess in connection with the end ring and the projection or the recess in connection with the housing of the screen refer to either the projection or the recess directly in the end ring or in the housing of the screen or the projection or the recess in a part arranged in connection with the end ring or the housing of the screen.
[0012] The invention provides such an advantage that when the plane surface on the projection is supported on the plane surface in the recess or vice versa a planar contact is created between the projection and ,the re-cess, where the forces caused by the screen cylinder showing a tendency to rotate while using the screen are divided into a broader area than previously.
The structure of the screen therefore becomes rmore durable than before.
When the recess forms a slot that is of circular shape in cross section and when the projection forms a pin that is of circular shape in cross section corre-sponding to the hole, said projection and recess can easily be made and thus the support in question can easily be implemented. However, what can be achieved when the recess is a groove and the projection is a wedge is planar support surfaces provided with greater surface areas than the previous ones, i.e. said planar surfaces. Thus, the above-mentioned forces caused by the screen cylinder that tends to rotate while using the screen, are divided into a very broad area in the joint.
BRIEF DESCRIPTION OF THE DRAWINGS
[0013] In the following the invention will be described in greater de-tail by means of the preferred embodiments with reference to the accompany-ing drawings, in which Figure 1 schematically shows a screen in cross section and viewed from the end of the screen, Figure 2 schematically shows the screen of Figure 1 viewed from the axial direction thereof and in cross section, Figure 3 schematically shows a second E=nd of the screen of Figure 2 viewed from the axial direction and in cross section, Figure 4 schematically shows a second :acreen viewed from the ax-ial direction thereof and in cross section, Figure 5 shows a part of the screen shown in Figure 4 in cross sec-Lion, Figure 6 schematically shows a third screen viewed from the axial direction thereof and in cross section, and Figure 7 shows a part of the screen shown in Figure 6 in cross sec-tion.
[0014 For clarity, the Figures illustrate the invention in simplified form. Similar parts are indicated in the Figures with same reference numerals.
DETAILED DESCRIPTION OF THE INVENTION
[00153 Figure 1 schematically shows a screen 1 for cleaning or screening pulp suspension and a screen cylinder 2 supported on a housing 7 thereof viewed from the end thereof and in cross section, and Figures 2 and 3 schematically show the screen 1 and screen cylinder 2 shown in Figure 1 in the axial direction thereof in cross section. In Figure 2 the screen 1 is shown from the part of the screen cylinder 2, from where pulp is supplied to the screen 1. Figure 3 in turn shows the screen 1 from the point of the screen cyl-inder 2, where reject is discharged from the screen cylinder 2. The inner sur-face of the screen cylinder 2 is provided with screen wires 3 arranged about the entire inner circumference of the screen cylinder 2 to form a screen sur-face. What are found between the screen wires 3 are screen slots, through which liquid and a desired .part of the fibres are allowed to flow outside the screen cylinder 2 at the same time as slivers and excessively large fibres, bundles of fibres and other assorted pulp remain nn the inner surface of the screen cylinder 2 to be removed at the other end thereof. The screen wires 3 are fastened to supporting wires 4 or to supporting bars 4 before the support-ing bars 4 are bent into circular shape so that a screen cylinder 2 having an appropriately sized diameter is formed. The screE:n cylinder 2 may also be made so that the screen wires 3 are fastened onto the inner circumference of the supporting bars 4 bent already in advance into the shape of a circle. The supporting bars 4 are placed at appropriate intervals in the axial direction of the screen cylinder 2 such that the screen wires 3 remain rigidly and firmly in position. The screen wires 3 can be fastened to the supporting bar 4 by weld-ing, but the pressure at the inner edge of the supporting bar 4 caused by the bending of the supporting bar 4 assists the screen wires 3 to remain fastened.
Instead of welding the screen wires 3 can be attached to the supporting bar 4 also using a crimp joint. Supporting rings 5 can also be mounted around the supporting bars 4. The supporting rings 5 support the supporting bars 4 and receive in the screen cylinder 2 the forces achieved by the pressure difference caused by the different varying pressures at the different sides of the screen surface thereof.
[00163 The screen cylinder 1 is further provided with end rings 6 that allow supporting the screen cylinder 2 on the housing 7. In Figure 2, the end ring 6 is fastened to the screen cylinder 2 such that a shrink fit is placed be-tween the supporting bar 4 closest to the erids of irhe screen wires 3 and the end ring 6. A force acts on the shrink fit that perpendicularly affects the axis of the screen cylinder 2 and that extends from the direction of the outer circum-ference of the end ring 6 to the direction of the supporting bar 4. Such an af-fecting force thus locks the screen surface formed of the screen wires 3 through the supporting bar 4 to be substantially stationary in relation to the end ring 6. The screen surface formed of the screen wires 3 can be locked in re-spect of the end ring 6 also by welding the ends of the screen wires 3 to the end ring 6. Such an alternative is shown in Figure 4, in which the ends of the screen wires 3 are fastened using welds 8 to the end ring 6. For clarity, the Figures also show arrow R parallel to the radius of i:he screen cylinder 2 that is directed to point from the axial direction of the screen cylinder 2 to the direction of the outer circumference of the screen cylinder 2.
[0017] The screen 1 is also provided with a rotor 9, in which a plate is placed on the inner side of the screen surface of the screen 1 at a prede-termined distance from the screen surface. The rotor 9 is rotated by a motor that is not shown in the Figures for the sake of clarity, thus mixing the pulp suspension in the screen cylinder 2. At the same time the rotor 9 cleans the screen surface of the screen cylinder 2 of sliver and fibre layers thickened thereto.
[0018] Figures 2 and 3 also show schematically an embodiment for fastening the screen cylinder 2 to the housing 7 of the screen 1. Figure 2 thus illustrates how the screen cylinder 2 is supported on the housing 7 of the screen 1 at the end of the screen cylinder 2, from where pulp is supplied to the screen cylinder 2, and Figure 3 shows how the screen cylinder 2 is supported at the end of the housing 7 of the screen 1, from where reject is discharged from the screen cylinder 2. What characterizes the fastening of the screen cyl-inder 2 to the housing 7 of the screen 1 at both ends of the screen cylinder 2 is that the screen cylinder 2 is fastened to the housing 7 of the screen 1 using a projectionlrecess mounting in the axial direction of the screen cylinder 2 be-tween the housing 7 and the end ring 6. In Figures 2 and 3, the end rings 6 of the screen cylinder 2 are provided with one or more recesses in the axial direc-tion of the screen cylinder 2, to which recess a corresponding projection in the axial direction of the screen cylinder 2 can be directed. In Figures 2 and 3 the recess in the axial direction of the screen cylinder ;? is formed of a slot 11 that is of circular shape in cross section formed in the end ring 6. Instead of the slot 11 a hole extending through the end ring 6 could also be used. In Figures 2 and 3 the projection in the axial direction of the screen cylinder 2 is formed of a pin 13 or a screw 13 fastened to the housing 7 of the screen 1 that is directed to the slot 11 when assembling the screen 1. In Figure 2 the pin 13 is fastened to a cover part 12 of the housing 7 of the screen 1 by welding and in Figure 3 the pin 13 is fastened to a flange part 14 of the housing 7 of the screen 1.
The inner surface of the slot 11 forms a plane surface A of the recess substantially in the axial direction of the screen cylinder 2, the plane surface A being arched in the direction of the circumference of the screen cylinder 2. The outer surface or the outer circumference of the pin 13 or the screw 13 forms a plane surface B of the projection substantially in the axial direction of the screen cylinder 2, and the plane surface B also being arched in the direction that is perpendicular to the axis of the screen cylinder 2. When using the screen 1 the plane surface A of the recess or the slot 11 substantially in the axial direction of the screen cylinder 2 is supported on the plane surface B of the projection i.e. the pin substantially in the axial direction of the screen cylinder 2, thus preventing the screen cylinder 2 from rotating in relation to the housing 7 of the screen 1 when employing the screen 1.
[0019] The solution provides such an advantage that when the plane surFace B on the projection is supported on the plane surface A in the recess or vice versa, the force. that tends to rotate the screen cylinder 2 in rela-tion to the housing of the screen 1 is conveyed whE;n using the screen 1 to the housing 7 of the screen 1 through the plane surfaces A and B in the recess and projection. What can therefore be found between tine projection and the recess is what is known as a planar contact that allows the forces conveyed when in contact to be divided within the area of the touching surfaces into a broader area, whereby the structure of the screen thus becomes more durable than previously.
[0020 In Figure 3 the pin 13 is fastened by welding to a hole in the flange part 14 of the housing 7 of the screen 1. When mounting the screen cyl-inder 2 to the housing 7 of the screen 1, the slots 11 formed on the surface facing the flange part 14 in the end ring 6 are positioned at the pins 13 and the screen cylinder 2 is placed in position such that the pins 13 are inserted into the slots 11 in the end rings 6. The projectionlrecess mounting shown in Figure 3 can therefore be used also to direct the screen cylinder 2 into position in the housing 7 of the screen 1, but the particular aim of the projectionlrecess mounting in the axial direction of the screen cylinder 2 shown is to prevent the screen cylinder 2 from rotating in relation to the housing 7 of the screen 1 when using the screen 1.
[0021] Figure 2 shows how the screen cylinder 2 is supported on the cover part 12 of the housing 7 of the screen 1. In the solution shown in Figure 2, the end ring 6 is provided with a slot 11 on the surface in the direction of the cover part 12 of the housing 7 of the screen 1, in which slot 11 a pin is placed that is fastened by welding to the hole through the cover part 12.
The cover part 12 is in turn fastened to the housing 7 of the screen 1 for instance using a bolt fastening 15. The projectionlrecess mounting allows setting the cover part 12 of the housing 7 of the screen 1 accurately into position, but the primary aim of the projection/recess mounting in the axial direction of the screen cylinder 2 is to prevent the screen cylinder 1 from rotating in relation to a screen basket 2.
[0022] In Figures 2 and 3 the pins are arranged in the cover part 12 and the flange part 14 of the housing 7 of the screen 1 and the slots 11 are in turn formed in the end ring 6, but the projectionlrecess mounting in question can also be implemented vice versa so that the pins 13 are arranged in con-nection with the end rings 6 and the slots 11 are formed in the cover part 12 and the flange part 14 of the housing 7 of the screen 1. Instead of pins 13, pro-jections formed in the end ring 6, the cover part 12 or the flange part 14 during the manufacturing process thereof can be made, said projections being made of the same material and forming a uniform structure with the parts concerned.
The slot 11 and the pin 13, which are of circular shape in cross section, may naturally be replaced by slots and pins that are of quadrangle or polygon shape in cross section, but a slot that is of angular shape in cross section is, however, more difficult to manufacture.
[0023] Figures 4 and 5 schematically sl~tow a second embodiment for fastening the screen cylinder 2 to the housing '7 of the screen 1. Figure illustrates how the screen cylinder 2 is supported on the housing 7 of the screen 1 at the end of the screen cylinder 2, from where pulp is supplied to the screen cylinder 2 and Figure 5 shows said fastening at cross section D shown in Figure 4. In the embodiment shown in Figure:> 4 and 5, a groove 16 is formed in the end ring 6; the groove thus forming a recess in the axial direction of the screen cylinder 2 provided with a plane surface A in the axial direction of the screen cylinder 2. Preferably the longer side of the groove 16 is arranged to move in parallel with the radius of the screen cylinder 2. The cover part 12 of ' CA 02478566 2004-08-18 1~
the housing 7 of the screen 1 is in turn provided with a wedge 17, which may be a separate wedge fastened to the cover part 12 for instance by welding or using a screw fastening or a wedge arranged to form a uniform part with the cover part 12 during the manufacturing thereof. The wedge 17 thus forms a projection in the axial direction of the screen cylinder 2, the projection being provided with a plane surface B in the axial direction of the screen cylinder 2.
When mounting the cover part 12 of the housing T into position, one or more wedges 17 in the cover part 12 are directed into one or more grooves 16 in the end ring 6. When employing the screen 1 the plane surface A of the groove 16 in the end ring 6 is supported on the plane surtace B of the wedge 17 in the cover part 12 of the housing 7 of the screen 1, thus preventing the screen cyl-inder 2 from rotating in relation to the housing of the screen 1.
[0024 The embodiment shown in Figures 4 and 5, where the pro-jection/recess mounting is implemented by means of the wedge 17 and the groove 16, enables to achieve support surfaces with a larger surface area than in the projection/recess mounting based on the slot 11 and the pin 13. Thus, the forces brought about to the mounting that are caused by the screen cylin-der 2 having the tendency to rotate when using the screen 1 are directed to a broader area in the mounting, whereupon the mounting becomes more dura-ble. The fastening solution based on the groove 15 and the wedge 17 allows implementing the fastening solution determined for a certain total load with a smaller number of fastening points than the fastening solution based on the slot 11 and the pin 13. The fastening solution according to Figures 4 and 5 may naturally also be used at the end of the screen cylinder 2, from where re-ject is discharged from the screen cylinder 2.
[0025 Figures 6 and 7 schematically shows a third embodiment for fastening the screen cylinder 2 to the housing 7 of the screen1. Figure 6 shows how the screen cylinder 2 is supported on the housing 7 of the screen 1 at the end of the screen cylinder 2, from where pulp is supplied to the screen cylinder 2, and Figure 7 shows said fastening at cross section E shown in Figure 6. In the embodiment shown in Figures 6 and 7 the end ring 6 is provided with the groove 16 that forms the recess in the axial direction of the screen cylinder 2, the recess being provided with the plane surface A in the axial direction of the screen cylinder 2: The wedge 17 is arranged in this solution to the cover part 12 of the housing 7 of the screen 1 using a fastening flange 18. The fastening flange 18 is, like the end ring 6, provided with a corresponding groove for the wedge 17. However, the wedge groove in the fastening flange 18 is lower than the wedge groove 16 in the end ring 6. The wedge 17 is arranged into a groove in the fastening flange 18 and the fastening flange 18 and the wedge 17 are fastened to the cover part 12 for instance by means of screws. The wedge 17 thus forms a projection in the axial direction of the screen cylinder provided with the plane surface B in the axial direction of the screen cylinder 2.
When mounting the cover part 12 of the housing 7 into position, one or more wedges 17 in the cover part 12 are directed into position ire one or more grooves 16 in the end ring 6. When employing the screen 1 the plane surface A of the groove 16 in the end ring 6 is supported on the plane surface B of the wedge 17 coupled using the fastening flange 18 to the cover part 12 of the housing 7 of the screen 1, thus preventing the screen cylinder 2 from rotating in relation to the housing of the screen 1. The fastening solution shown in Fig-ures 6 and 7 may naturally be used at the end of the screen cylinder 2, from where reject is discharged from the screen cylinder 2.
[00261 The drawing and the specification associated therewith are merely intended to illustrate the idea of the invention. The details of the inven-tion may vary within the scope of the claims. The structure of the screen cylin-der 2 shown in Figures 1 to 7 is such where the supporting bars 4 and the supporting rings 5 supporting the screen surface formed of the screen wires 3 are placed outside the screen surface, but the fastening according to the solu-tion may naturally also be used in such screens; where the supporting bars 4 and the supporting rings 5 are inside the screen surface.
Claims (7)
1. A screen for cleaning or screening pulp suspension, the screen (1) comprising a housing (7), a rotor (9) rotatably arranged in connection with the housing (7) and a screen cylinder (2) immovably arranged in connection with the housing (7), the screen cylinder comprising screen wires (3) mounted at predetermined intervals between one another in the axial direction of the screen cylinder (2) to form a cylindrical screen surface, the screen wires being fastened to circular supporting bars (4) and the ends of the screen cylinder (2) are provided with end rings (6) of the screen cylinder (2), from which end rings (6) the screen cylinder (2) is arranged in connection with the housing (7) of the screen (1), characterized in that the end ring (6) is provided with at least one groove (16) in the axial direction of the screen cylinder (2) and the housing (7) of the screen (1) is pro-vided with at least one wedge (17) in the axial direction of the screen cylinder (2) or the end ring (6) is provided with at least one wedge (17) in the axial di-rection of the screen cylinder (2) and the housing (7) of the screen (1) is pro-vided with at least one groove (16) in the axial direction of the screen cylinder (2) and that said groove (16) comprises at least one plane surface (A) substan-tially in the axial direction of the screen cylinder (2) and that said wedge (17) comprises at least one plane surface (B) substantially in the axial direction of the screen cylinder (2), and that said wedge (17) is arranged in said groove (16) such that the plane surface (B) on the wedge (17) is arranged against the plane surface (A) in the groove (16), whereby the plane surface (B) on the wedge (17) and the plane surface (A) in the groove (16) are arranged to be supported against one an-other to prevent the screen cylinder (2) from rotating in relation to the housing (7) of the screen (1).
2. A screen as claimed in claim 1, charactarized in that the groove (16) is arranged in connection with the end ring (6) and the wedge (17) is arranged in connection with the housing (7) of the screen (1).
3. A screen as claimed in claim 2, charactarized in that the groove (16) is arranged in the end ring (6) and the wedge (17) is arranged in the housing of the screen (1).
4. A screen as claimed in claim 2, characterized in that the groove (16) is arranged in the end ring (6) and the wedge (17) is arranged in connection with the housing (7) of the screen (1) supported by a fastening flange (18).
5. A screen cylinder for a screen (1) intended for cleaning and screening pulp suspension, the screen cylinder (2) comprising screen wires (3) mounted at predetermined intervals between one another in the axial direction of the screen cylinder (2) to form a cylindrical screen surface, the screen wires being fastened to circular supporting bars (4) and the ends of the screen cylin-der (2) are provided with end rings (6) of the screen cylinder (2), from which end rings (6) the screen cylinder (2) can be arranged in connection with a housing (7) of the screen (1), characterized in that the end ring (6) of the screen cylinder (2) is provided with at least one groove (16) in the axial direction of the screen cylinder (2) that can be ar-ranged in connection with at least one wedge (17) in the axial direction of the screen cylinder (2) arranged in connection with the housing (7) of the screen (1) or that the end ring (6) of the screen cylinder (2) is provided with at least one wedge (17) in the axial direction of the screen cylinder (2) that can be ar-ranged in connection with at least one groove (16) in the axial direction of the screen cylinder (2) arranged in connection with the housing (7) of the screen (1) and that said groove (16) arranged in connection with the end ring (6) of the screen cylinder (2) comprises at least one plane surface (A) substantially in the axial direction of the screen cylinder (2) that can be arranged in connection with a plane surface (B) substantially in the axial direction of the screen cylin-der (2) on the wedge (17) arranged in connection with the housing (7) of the screen (1) such that the plane surface (B) of the wedge (17) is arranged against the plane surface (A) of the groove (16), whereby the plane surfaces (A, B) are arranged to be supported against one another and to prevent the screen cylinder (2) from rotating in relation to the housing (7) of the screen (1), or that said wedge (17) arranged in connection with the end ring (6) of the screen cylinder (2) comprises at least one plane surface (B) substantially in the axial direction of the screen cylinder (2) that can be arranged in connection with the plane surface (A) substantially in the axial direction of the screen cyl-inder (2) in the groove (16) arranged in connection with the housing (7) of the screen (1) such that the plane surface (B) of the wedge (17) is arranged against the plane surface (A) of the groove (16), whereby the plane surfaces (A, B) are arranged to be supported against one another and to prevent the screen cylinder (2) from rotating in relation to the housing (7) of the screen (1).
6. A screen cylinder as claimed in claim 5, characterized in that the groove (16) is arranged in the end ring (6) of the screen cylinder (2).
7. A screen cylinder as claimed in claim 5, characterized in that the wedge (17) is arranged in the end ring (6) of the screen cylinder (2).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FIU20030310 | 2003-08-22 | ||
| FI20030310U FI6477U1 (en) | 2003-08-22 | 2003-08-22 | Strainer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2478566A1 true CA2478566A1 (en) | 2005-02-22 |
Family
ID=27838772
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002478566A Abandoned CA2478566A1 (en) | 2003-08-22 | 2004-08-18 | Screen |
Country Status (5)
| Country | Link |
|---|---|
| AT (1) | AT7465U1 (en) |
| CA (1) | CA2478566A1 (en) |
| DE (1) | DE202004013075U1 (en) |
| FI (1) | FI6477U1 (en) |
| FR (1) | FR2858986B3 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013010959B3 (en) * | 2013-07-01 | 2014-08-07 | Andritz Fiedler Gmbh | screening device |
-
2003
- 2003-08-22 FI FI20030310U patent/FI6477U1/en not_active IP Right Cessation
-
2004
- 2004-08-16 FR FR0408902A patent/FR2858986B3/en not_active Expired - Lifetime
- 2004-08-18 CA CA002478566A patent/CA2478566A1/en not_active Abandoned
- 2004-08-20 AT AT0061304U patent/AT7465U1/en not_active IP Right Cessation
- 2004-08-20 DE DE202004013075U patent/DE202004013075U1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| FI6477U1 (en) | 2004-11-23 |
| FR2858986A3 (en) | 2005-02-25 |
| DE202004013075U1 (en) | 2004-10-14 |
| FIU20030310U0 (en) | 2003-08-22 |
| AT7465U1 (en) | 2005-04-25 |
| FR2858986B3 (en) | 2005-07-22 |
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Legal Events
| Date | Code | Title | Description |
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| EEER | Examination request | ||
| FZDE | Dead |