EP1963566A1 - Composite-construction supporting beam and method for manufacturing a corresponding supporting beam - Google Patents

Composite-construction supporting beam and method for manufacturing a corresponding supporting beam

Info

Publication number
EP1963566A1
EP1963566A1 EP06808023A EP06808023A EP1963566A1 EP 1963566 A1 EP1963566 A1 EP 1963566A1 EP 06808023 A EP06808023 A EP 06808023A EP 06808023 A EP06808023 A EP 06808023A EP 1963566 A1 EP1963566 A1 EP 1963566A1
Authority
EP
European Patent Office
Prior art keywords
supporting beam
profile
piece
pieces
profile pieces
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.)
Withdrawn
Application number
EP06808023A
Other languages
German (de)
French (fr)
Inventor
Reijo Hassinen
Kari Holopainen
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.)
Valmet Technologies Oy
Original Assignee
Metso Paper 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
Application filed by Metso Paper Oy filed Critical Metso Paper Oy
Publication of EP1963566A1 publication Critical patent/EP1963566A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
    • D21H23/34—Knife or blade type coaters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B1/00—Cleaning by methods involving the use of tools, brushes, or analogous members
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G3/00—Doctors
    • D21G3/005—Doctor knifes

Definitions

  • the present invention relates to a composite-construction supporting beam, which is arranged to be supported at its ends, and which includes elongated profile pieces of a composite material, which are arranged parallel to each other, adjacent pieces being joined to each other to create a load-bearing structure.
  • the invention also relates to a method for manufacturing a corresponding supporting beam.
  • Finnish patent application number 980679 discloses a supporting beam intended for a paper or finishing machine.
  • the supporting beam includes several profile elements of a composite material, which are joined to each other like a bundle.
  • the profile elements together form a supporting beam, in which there is, in addition, an attachment element for the work unit supported by the supporting beam.
  • the load-bearing capacity of the supporting beam is determined by the profile elements and their number. In other words, the loading-bearing capacity of the supporting beam can be increased by increasing the number of profile elements.
  • the composite material is lighter than steel.
  • the supporting beam described above is manufactured from profile elements that are shorter than the supporting beam.
  • each profile element consists of several pieces. This makes manufacture difficult and reduces particularly the durability of the supporting beam.
  • the supporting beam disclosed favours essentially round profile elements, which as such are easy to manufacture, for example by fibre winding. However, it is difficult to position round profile elements regularly to form a bundle.
  • there is only a small common contact surface between adjacent profile elements which both weakens the structure and makes manufacture difficult.
  • This also applies to the attachment of the attachment element on top of the bundle formed of profile elements.
  • an irregular surface which collects impurities, is formed on the supporting beam.
  • the invention is intended to create a new type of composite- construction supporting beam, which is both lighter and stiffer than previously.
  • the invention is intended to create a new type of method for manufacturing a composite- construction supporting beam, which method is both simpler and more reliable than previously, and by means of which different kinds of supporting beam can be manufactured.
  • the characteristic features of the supporting beam according to the present invention are stated in the accompanying Claim 1.
  • the characteristic features of the method according to the invention are stated in the accompanying Claim 16.
  • the profile pieces in the supporting beam according to the invention are manufactured in a new manner and their shape is surprising. Thus the profile pieces can be attached to each other more easily and more strongly than before. In addition, in its totality the supporting beam becomes lighter and also stiffer than before.
  • the shaping of the profile pieces also permits other properties, which will permit and facilitate the use of the supporting beam, to be incorporated in them.
  • the properties of the supporting beam can be altered simply.
  • supporting beams can be manufactured simply for different positions and for structures of many different widths.
  • the adjacent profile pieces can be attached to each other securely and exactly as desired.
  • Figure 2 shows a side view of a second application of the supporting beam according to the invention
  • Figure 3 shows a side view of a third application of the supporting beam according to the invention
  • Figure 4 shows an exploded axonometric view of the totality of a fourth application of the supporting beam according to the invention.
  • Both the supporting beams according to the invention and the method for manufacturing it can be used generally as a beam structure in various applications.
  • the beam structure can also be applied advantageously in web-forming machines, in which long supporting beams are required.
  • problems are caused in web-forming machines by high temperatures and vibration.
  • the following are descriptions of web-forming- machine applications.
  • In several positions in a web-forming machine for example in paper, board, and finishing machines, use is made of supporting beams, which are supported only at their ends on the frame of the web-forming machine. In other words, the length of the supporting beam corresponds essentially to the width of the web-forming machine.
  • the task of the supporting beam is to support some other device, such as a measuring device, an application head, or a doctor blade together with its blade holder. Particularly when the device is the doctor blade of a doctor apparatus, it is loaded, so that the supporting beam requires a good load-bearing capacity and stiffness in different directions.
  • Figures 1 - 4 show various applications of the supporting beam according to the invention.
  • the supporting beam can also be used in other positions and tasks.
  • the supporting beam consists of elongated profile pieces of a composite material.
  • the term composite material refers to a polymer material reinforced with fibres.
  • the polymer is, for example, epoxy or polyester.
  • the profile pieces are arranged parallel to each other in the supporting beam and are attached to the adjacent pieces, to form a load-bearing construction. The use of a composite material creates a construction that is lighter than steel.
  • each profile piece is a full-length pultrusion piece, which extends over essentially the full width of the beam construction.
  • discontinuity points do not form in the supporting beam, making the structure durable and giving it homogenous strength.
  • manufacture of the supporting beam is simpler than previously.
  • the supporting beam is manufactured from hollow pultrusion pieces.
  • the structure of the supporting beam can be further optimized by arranging the wall thickness of the profile piece to vary at different points in the cross-sectional plane.
  • the composite material can be located where it will be most beneficial.
  • the profile pieces manufactured by pultrusion are arranged in such a way that most of the composite material is on the circumference of the supporting beam. This further improves the stiffness-to-weight ratio.
  • the shape of the supporting beam also affects its load-bearing capacity.
  • the outer lines of the supporting beam are formed from several consecutive arcs, which are fitted smoothly into each other.
  • the end result is a symmetrical and nearly circular external shape.
  • the common walls of the profile pieces form a honeycomb inside the supporting beam, which further increases the stiffness and load-bearing capacity of the supporting beam.
  • the load-bearing structure is created by combining elongated profile pieces of a composite material in parallel next to each other.
  • the length of the supporting beam is arranged to correspond to the width of the web-forming machine, the supporting beam being supported at its ends on the web-forming machine.
  • a blank corresponding to the profile piece, the length of which is arranged to be greater than the web-forming machine is manufactured by pultrusion from a composite material.
  • pultrusion can be used to manufacture blanks that are considerably longer than the width of the web-forming machine, preferably of a length many times the said width.
  • profile pieces the length of the supporting beam can be simply cut from the blank and then joined together to form the supporting beam.
  • Figure Ia shows a first application of the supporting beam 10 according to the invention.
  • the actual load- bearing structure is formed of two profile pieces 11 joined to each other.
  • the profile piece is a polygon, in the cross-sectional plane of which the wall thickness varies at different points.
  • the supporting beam is also given a smooth surface, without dirt-collecting protrusions.
  • the settings of the pultrusion machine can be altered to easily arrange the wall thickness of the profile piece as desired.
  • the composite material can be placed where it is required.
  • the stiffness-weight ratio of the supporting beam can optimalized.
  • the supporting beam is made as stiff as possible, using the smallest possible amount of material .
  • the wall thickness at the corners of the polygon is greater than elsewhere in the profile piece.
  • the strongest parts of the wall are therefore placed on the outer circumference of the supporting beam and at the node points, thus achieving good stiffness.
  • the thinner wall parts that lie next to each other will reinforce each other, which prevents them from buckling.
  • the construction in question is easy to implement precisely by using pultrusion, which is also referred to as nozzle pulling.
  • the wall thickness of the profile piece averages 2,5 mm - 10 mm, preferably 4 - 8 mm.
  • the thickest parts are thus at the corners of the polygon while correspondingly the thinnest parts are between the corners.
  • a surprisingly thin wall thickness can be used to achieve a load-bearing structure, which additionally has advantageous vibration properties.
  • the distance between the corners is sufficient to achieve stiffness.
  • Figure 2 shows a second application of the supporting beam 10 according to the invention.
  • the profile pieces in the supporting beam have a mutually similar shape and dimensions. This is realized not only in the application of Figure 2, but also in those of Figures Ia and Ib.
  • By using mutually similar profile pieces it is sufficient to manufacture a single type of blank.
  • the necessary number of profile pieces of the length of the supporting beam are cut from the blank and joined together.
  • By using sufficiently large profile pieces even a few profile pieces will be enough to give the supporting beam a sufficient load-bearing capacity.
  • the manufacture of the supporting beam will remain simple and the positioning of the profile pieces will be easy.
  • the profile piece includes protrusions and recesses dimensioned to suit each other, fitted in such a way that, in the supporting beam, a protrusion in one profile piece coincides with a recess in another adjacent profile piece, in order to attach the profile pieces to each to form a load-bearing structure.
  • the profile pieces 11 of Figure 2 should be installed by pushing from their ends.
  • protrusions and recess that are simpler than this, the profile pieces can be fitted laterally onto each other.
  • the number, shape, and location of the recesses and their corresponding protrusions can vary in different applications.
  • the supporting beam includes a support piece, which is arranged to be attached to a protrusion or recess of the profile piece, using a corresponding construction belonging to the support piece.
  • a blade holder 15 with a doctor blade 16 is fitted to the support piece 14 of Figure 2.
  • rollers 17 in the support piece 14 the shape and dimensions of which correspond to the recesses 12.
  • the feature in question can also be used especially to oscillate the blade holder 15, while the supporting beam 10 remains stationary.
  • the support piece 14 is Y-shaped and is permanently attached to the supporting beam 10.
  • Figure 3 shows a third application of the support piece 14, in which a recess is formed between two profile pieces 11.
  • a support of this kind too can be oscillated.
  • two kinds of profiles are used, with a total of three pieces .
  • Two of the profile pieces are mirror images of each other, so that they can be manufactured using the same nozzle, which will reduce manufacturing costs.
  • the shape of the third profile piece 11 is also symmetrical, which will facilitate manufacture.
  • the adjacent profile pieces have a large amount of common support surface, while there are corners in the profile pieces, which fit into each other, thus facilitating the making of the supporting beam, while the profile pieces remain correctly positioned relative to each other.
  • the supporting beam includes two kinds of profile pieces, which are arranged to be attached to each other, at least partly by shape-locking.
  • the shape-locking is created by the mutual shaping and dimensioning of the profile pieces.
  • the properties of the supporting beam can be altered by changing the lowest roundish profile piece. In lightly loaded positions, the profile piece in question can be a short arc, which is glued to the other profile pieces.
  • the load- bearing capacity and stiffness of the supporting beam can be increased substantially.
  • stiffeners are preferably fitted to the outer circumference of the supporting beam, where they will have the greatest effect.
  • stiffeners can also be fitted to an individual profile piece, prior to the profile pieces being attached to each other to form a supporting beam.
  • stiffeners can be retrofitted too, if problems appear in the operation of the supporting beam.
  • Preferably simple stiffener strips 19, which are easy to manufacture and attach, are used as stiffeners 18 ( Figure 3) .
  • pultrusion is used in the manufacture of the supporting beam.
  • similar full-length profile pieces are used, though the properties of the supporting beam can be further improved by using slightly more complicated profile pieces.
  • the pultrusion pieces need not be machined in order to be attached to each other, which accelerates and simplifies manufacture.
  • the polygonal profile pieces have a great deal of contact surface in common, so that an adhesive can advantageously be used to join them.
  • the profile pieces can be attached to each other by shape-locking. It is preferably to use both ways simultaneously, which will accelerate and facilitate manufacture.
  • the durability of the supporting beam will increase. For example, screws should be avoided, in order to prevent the formation of discontinuity points.
  • Durability, load-bearing capacity, and other properties can be further increased and improved by gluing stiffeners to the profile pieces .
  • the desired properties can be created in each application, without over-dimensioning the supporting beam.
  • Figure 4 shows a further application of the supporting beam according to the invention, in which two mutually symmetrical profile pieces 11 are intended to be attached to each other by gluing.
  • several narrow support pieces 14 are used, to which a blade holder 15 can be attached.
  • the support pieces 14 are arranged to lie in the recess 12 formed between the profile pieces 11.
  • the supporting beam 10 includes an end piece 20 fitted to both ends. According to the invention, the shape of the end piece essentially corresponds to that of the supporting beam 10 formed from profile pieces 11, and it at least partly extends inside the supporting beam 10.
  • the end piece closes the open structure while the part 21 extending inside makes the end of the supporting beam 10 more sturdy.
  • the supporting beam lacks conventional bearings, which further simplifies the overall construction.
  • the supporting beam 10 is aligned to the desired position within the limits of the intervals in the mounting lug 22 while the play in the blade holder 15 is exploited to press the doctor blade 16 against the surface to be doctored.
  • the composite material used in the manufacture of the supporting beam is preferably carbon or glass-fibre reinforced plastic. Combinations of these can also be used while especially in smallish stiffener strips even expensive materials, such as boron fibre, can be used.
  • the materials in question are also unresponsive to variations in temperature, so that separate insulators are unnecessary.
  • Particularly simple and especially similar profile pieces can be manufactured rapidly and cost-effectively by pultrusion.
  • the necessary number of profiles pieces for each purpose, which are cut from the blank, can be easily joined to each other.
  • ready-to-use end pieces can be manufactured for each structure, thus considerably accelerating the manufacture of the supporting beam.
  • the supporting beam according to the invention is also light, but stiff. In addition, its properties can be altered simply, even afterwards .

Abstract

The invention relates to a composite- construction supporting beam. The supporting beam (10) is arranged to be supported at its ends. The supporting beam (10) includes elongated profile pieces (11) of a composite material, which are arranged parallel to each other, adjacent pieces being joined to each other, in order to create a load-bearing structure. Each profile piece (11) is a full- length pultrusion piece, which extends essentially over the full length of the beam construction. The invention also relates to a method for manufacturing a composite-construction supporting beam.

Description

COMPOSITE-CONSTRUCTION SUPPORTING BEAM AND METHOD FOR MANUFACTURING A CORRESPONDING SUPPORTING BEAM
The present invention relates to a composite-construction supporting beam, which is arranged to be supported at its ends, and which includes elongated profile pieces of a composite material, which are arranged parallel to each other, adjacent pieces being joined to each other to create a load-bearing structure. The invention also relates to a method for manufacturing a corresponding supporting beam.
Finnish patent application number 980679 discloses a supporting beam intended for a paper or finishing machine. The supporting beam includes several profile elements of a composite material, which are joined to each other like a bundle. Thus, the profile elements together form a supporting beam, in which there is, in addition, an attachment element for the work unit supported by the supporting beam. In practice, the load-bearing capacity of the supporting beam is determined by the profile elements and their number. In other words, the loading-bearing capacity of the supporting beam can be increased by increasing the number of profile elements. In addition, the composite material is lighter than steel.
The supporting beam described above is manufactured from profile elements that are shorter than the supporting beam. In other words, in the cross-direction of a web-forming machine, each profile element consists of several pieces. This makes manufacture difficult and reduces particularly the durability of the supporting beam. Secondly, the supporting beam disclosed favours essentially round profile elements, which as such are easy to manufacture, for example by fibre winding. However, it is difficult to position round profile elements regularly to form a bundle. In addition, there is only a small common contact surface between adjacent profile elements, which both weakens the structure and makes manufacture difficult. This also applies to the attachment of the attachment element on top of the bundle formed of profile elements. In addition, an irregular surface, which collects impurities, is formed on the supporting beam.
The invention is intended to create a new type of composite- construction supporting beam, which is both lighter and stiffer than previously. In addition, the invention is intended to create a new type of method for manufacturing a composite- construction supporting beam, which method is both simpler and more reliable than previously, and by means of which different kinds of supporting beam can be manufactured. The characteristic features of the supporting beam according to the present invention are stated in the accompanying Claim 1. Correspondingly, the characteristic features of the method according to the invention are stated in the accompanying Claim 16. The profile pieces in the supporting beam according to the invention are manufactured in a new manner and their shape is surprising. Thus the profile pieces can be attached to each other more easily and more strongly than before. In addition, in its totality the supporting beam becomes lighter and also stiffer than before. The shaping of the profile pieces also permits other properties, which will permit and facilitate the use of the supporting beam, to be incorporated in them. In addition, the properties of the supporting beam can be altered simply. By means of the method according to the invention, supporting beams can be manufactured simply for different positions and for structures of many different widths. In addition, the adjacent profile pieces can be attached to each other securely and exactly as desired.
In the following, the invention is examined in detail with reference to the accompanying drawings showing some applications of the invention, in which Figure Ia shows a side view of a first application of the supporting beam according to the invention, Figure Ib shows a variation of the supporting beam of Figure
Ia, Figure 2 shows a side view of a second application of the supporting beam according to the invention, Figure 3 shows a side view of a third application of the supporting beam according to the invention, Figure 4 shows an exploded axonometric view of the totality of a fourth application of the supporting beam according to the invention.
Both the supporting beams according to the invention and the method for manufacturing it can be used generally as a beam structure in various applications. The beam structure can also be applied advantageously in web-forming machines, in which long supporting beams are required. In addition, problems are caused in web-forming machines by high temperatures and vibration. The following are descriptions of web-forming- machine applications. In several positions in a web-forming machine, for example in paper, board, and finishing machines, use is made of supporting beams, which are supported only at their ends on the frame of the web-forming machine. In other words, the length of the supporting beam corresponds essentially to the width of the web-forming machine. The task of the supporting beam is to support some other device, such as a measuring device, an application head, or a doctor blade together with its blade holder. Particularly when the device is the doctor blade of a doctor apparatus, it is loaded, so that the supporting beam requires a good load-bearing capacity and stiffness in different directions.
Figures 1 - 4 show various applications of the supporting beam according to the invention. In addition to the doctor apparatuses shown, the supporting beam can also be used in other positions and tasks. Generally, the supporting beam consists of elongated profile pieces of a composite material. The term composite material refers to a polymer material reinforced with fibres. For example, glass, carbon, or aramid fibres can be used as the reinforcement. Correspondingly, the polymer is, for example, epoxy or polyester. In addition, the profile pieces are arranged parallel to each other in the supporting beam and are attached to the adjacent pieces, to form a load-bearing construction. The use of a composite material creates a construction that is lighter than steel. In addition, the deformation of the supporting beam caused by a thermal load is smaller than in a steel construction. According to the invention, each profile piece is a full-length pultrusion piece, which extends over essentially the full width of the beam construction. Thus discontinuity points do not form in the supporting beam, making the structure durable and giving it homogenous strength. In addition, the manufacture of the supporting beam is simpler than previously.
According to the invention, the supporting beam is manufactured from hollow pultrusion pieces. Thus the amount of composite material remains reasonable relative to the size achieved. At the same time, a good stiffness-to-weight ratio is created. The structure of the supporting beam can be further optimized by arranging the wall thickness of the profile piece to vary at different points in the cross-sectional plane. Thus the composite material can be located where it will be most beneficial. In general, the profile pieces manufactured by pultrusion are arranged in such a way that most of the composite material is on the circumference of the supporting beam. This further improves the stiffness-to-weight ratio. The shape of the supporting beam also affects its load-bearing capacity. According to the invention, in the cross-sectional plane the outer lines of the supporting beam are formed from several consecutive arcs, which are fitted smoothly into each other. Preferably, the end result is a symmetrical and nearly circular external shape. In addition, the common walls of the profile pieces form a honeycomb inside the supporting beam, which further increases the stiffness and load-bearing capacity of the supporting beam.
In practice, the load-bearing structure is created by combining elongated profile pieces of a composite material in parallel next to each other. In addition, the length of the supporting beam is arranged to correspond to the width of the web-forming machine, the supporting beam being supported at its ends on the web-forming machine. According to the invention, a blank corresponding to the profile piece, the length of which is arranged to be greater than the web-forming machine is manufactured by pultrusion from a composite material. In practice, pultrusion can be used to manufacture blanks that are considerably longer than the width of the web-forming machine, preferably of a length many times the said width. Thus profile pieces the length of the supporting beam can be simply cut from the blank and then joined together to form the supporting beam. By means of the method in question, it is possible to form different kinds of supporting beams easily and quickly, by combining a sufficient number of profile pieces of the desired dimension.
Figure Ia shows a first application of the supporting beam 10 according to the invention. In this case, the actual load- bearing structure is formed of two profile pieces 11 joined to each other. Correspondingly, in the application of Figure Ib four profile pieces 11 are combined. The same references numbers are used for components that are functionally similar. According to the invention, the profile piece is a polygon, in the cross-sectional plane of which the wall thickness varies at different points. Thus firstly a good contact surface is obtained between the adjacent profile pieces in the polygon. By means of suitable dimensioning, the supporting beam is also given a smooth surface, without dirt-collecting protrusions. Secondly, the settings of the pultrusion machine can be altered to easily arrange the wall thickness of the profile piece as desired. In other words, the composite material can be placed where it is required. Thus the stiffness-weight ratio of the supporting beam can optimalized. In other words, the supporting beam is made as stiff as possible, using the smallest possible amount of material .
Though many factors affect the dimensioning of the profile piece, according to the invention the wall thickness at the corners of the polygon is greater than elsewhere in the profile piece. The strongest parts of the wall are therefore placed on the outer circumference of the supporting beam and at the node points, thus achieving good stiffness. In addition, the thinner wall parts that lie next to each other will reinforce each other, which prevents them from buckling. The construction in question is easy to implement precisely by using pultrusion, which is also referred to as nozzle pulling.
According to the invention, the wall thickness of the profile piece averages 2,5 mm - 10 mm, preferably 4 - 8 mm. On the basis of the above, the thickest parts are thus at the corners of the polygon while correspondingly the thinnest parts are between the corners. By combining several reinforced polygons, even a surprisingly thin wall thickness can be used to achieve a load-bearing structure, which additionally has advantageous vibration properties. In other words, the distance between the corners is sufficient to achieve stiffness. In addition, in the honeycomb structure formed there are also flexible parts, which effectively attenuate vibrations that may arise from external impulses .
Figure 2 shows a second application of the supporting beam 10 according to the invention. Generally, the profile pieces in the supporting beam have a mutually similar shape and dimensions. This is realized not only in the application of Figure 2, but also in those of Figures Ia and Ib. By using mutually similar profile pieces, it is sufficient to manufacture a single type of blank. The necessary number of profile pieces of the length of the supporting beam are cut from the blank and joined together. According to the invention, there are 2 - 5, preferably 2 - 3 profile pieces in the supporting beam. By using sufficiently large profile pieces, even a few profile pieces will be enough to give the supporting beam a sufficient load-bearing capacity. At the same time, the manufacture of the supporting beam will remain simple and the positioning of the profile pieces will be easy.
The ease of manufacture of the supporting beam can be further improved and its durability increased. According to the invention, the profile piece includes protrusions and recesses dimensioned to suit each other, fitted in such a way that, in the supporting beam, a protrusion in one profile piece coincides with a recess in another adjacent profile piece, in order to attach the profile pieces to each to form a load-bearing structure. On one straight side of the triangular profile pieces 11 of Figure 2, there are three recesses 12. In addition, on another straight side there correspondingly shape protrusions 13 at corresponding points. By means of the solution in question, the profile pieces can be easily correctly aligned while the shape-locking created will reinforce the structure of the supporting beam. The profile pieces 11 of Figure 2 should be installed by pushing from their ends. By using protrusions and recess that are simpler than this, the profile pieces can be fitted laterally onto each other. The number, shape, and location of the recesses and their corresponding protrusions can vary in different applications.
The versatility of the shape-locking shown in Figure 2 has also a second purpose. According to the invention, the supporting beam includes a support piece, which is arranged to be attached to a protrusion or recess of the profile piece, using a corresponding construction belonging to the support piece. A blade holder 15 with a doctor blade 16 is fitted to the support piece 14 of Figure 2. In addition, there are rollers 17 in the support piece 14, the shape and dimensions of which correspond to the recesses 12. Thus the support piece 14 is arranged to move in the recess 12 axially relative to the supporting beam 10. The feature in question can also be used especially to oscillate the blade holder 15, while the supporting beam 10 remains stationary. In Figures Ia and Ib the support piece 14 is Y-shaped and is permanently attached to the supporting beam 10.
Figure 3 shows a third application of the support piece 14, in which a recess is formed between two profile pieces 11. By selecting suitable materials, a support of this kind too can be oscillated. Unlike the above, two kinds of profiles are used, with a total of three pieces . Two of the profile pieces are mirror images of each other, so that they can be manufactured using the same nozzle, which will reduce manufacturing costs. The shape of the third profile piece 11 is also symmetrical, which will facilitate manufacture. In addition, the adjacent profile pieces have a large amount of common support surface, while there are corners in the profile pieces, which fit into each other, thus facilitating the making of the supporting beam, while the profile pieces remain correctly positioned relative to each other. According to the invention, the supporting beam includes two kinds of profile pieces, which are arranged to be attached to each other, at least partly by shape-locking. The shape-locking is created by the mutual shaping and dimensioning of the profile pieces. For example, in the application of Figure 3 , the properties of the supporting beam can be altered by changing the lowest roundish profile piece. In lightly loaded positions, the profile piece in question can be a short arc, which is glued to the other profile pieces. On the other hand, by using a sturdy profile piece that may even itself include several cells, the load- bearing capacity and stiffness of the supporting beam can be increased substantially.
By means of the shaping of the profile piece, the thickness of the material located at the corners, and by combining the profile pieces, a supporting beam with a good load-bearing capacity and stiffness will be achieved. The stiffness and/or vibration properties of the supporting beam can be further improved by fitting longitudinal stiffeners to the supporting beam. The stiffeners are preferably fitted to the outer circumference of the supporting beam, where they will have the greatest effect. On the other hand, stiffeners can also be fitted to an individual profile piece, prior to the profile pieces being attached to each other to form a supporting beam. In addition, stiffeners can be retrofitted too, if problems appear in the operation of the supporting beam. Preferably simple stiffener strips 19, which are easy to manufacture and attach, are used as stiffeners 18 (Figure 3) . In addition, it is also possible to use in the manufacture materials that are of a higher quality and/or standardized, the amount of which required will be less than that of other materials. Thus the total costs will remain as low as possible while the properties of the supporting beam will be raised to a new level. The dimensioning and placing of the stiffeners are defined separately for each supporting beam and position, in order to meet the requirements individually in each case.
According to the invention, pultrusion is used in the manufacture of the supporting beam. In addition, similar full-length profile pieces are used, though the properties of the supporting beam can be further improved by using slightly more complicated profile pieces. In addition, the pultrusion pieces need not be machined in order to be attached to each other, which accelerates and simplifies manufacture. The polygonal profile pieces have a great deal of contact surface in common, so that an adhesive can advantageously be used to join them. In addition to, or instead of gluing, the profile pieces can be attached to each other by shape-locking. It is preferably to use both ways simultaneously, which will accelerate and facilitate manufacture. At the same time, the durability of the supporting beam will increase. For example, screws should be avoided, in order to prevent the formation of discontinuity points. Durability, load-bearing capacity, and other properties can be further increased and improved by gluing stiffeners to the profile pieces . Thus the desired properties can be created in each application, without over-dimensioning the supporting beam.
Figure 4 shows a further application of the supporting beam according to the invention, in which two mutually symmetrical profile pieces 11 are intended to be attached to each other by gluing. In this application, several narrow support pieces 14 are used, to which a blade holder 15 can be attached. Thus even metal blade holders can be used in a composite-construction supporting beam, without problems due to differences in thermal expansion. In addition, the support pieces 14 are arranged to lie in the recess 12 formed between the profile pieces 11. In addition, for support on the web-forming machine, the supporting beam 10 includes an end piece 20 fitted to both ends. According to the invention, the shape of the end piece essentially corresponds to that of the supporting beam 10 formed from profile pieces 11, and it at least partly extends inside the supporting beam 10. Firstly, the end piece closes the open structure while the part 21 extending inside makes the end of the supporting beam 10 more sturdy. In the end piece 20 of the application of Figure 4, there is a mounting lug 22. In other words, the supporting beam lacks conventional bearings, which further simplifies the overall construction. The supporting beam 10 is aligned to the desired position within the limits of the intervals in the mounting lug 22 while the play in the blade holder 15 is exploited to press the doctor blade 16 against the surface to be doctored. The composite material used in the manufacture of the supporting beam is preferably carbon or glass-fibre reinforced plastic. Combinations of these can also be used while especially in smallish stiffener strips even expensive materials, such as boron fibre, can be used. The materials in question are also unresponsive to variations in temperature, so that separate insulators are unnecessary. Particularly simple and especially similar profile pieces can be manufactured rapidly and cost-effectively by pultrusion. The necessary number of profiles pieces for each purpose, which are cut from the blank, can be easily joined to each other. In addition, ready-to-use end pieces can be manufactured for each structure, thus considerably accelerating the manufacture of the supporting beam. The supporting beam according to the invention is also light, but stiff. In addition, its properties can be altered simply, even afterwards .

Claims

1. Composite-construction supporting beam, which is arranged to be supported at its ends, and which includes elongated profile pieces (11) of a composite material, which are arranged parallel to each other, adjacent pieces being joined to each other, in order to create a load-bearing structure, characterized in that each profile piece (11) is a full-length pultrusi- on piece, which extends essentially over the full length of the beam construction.
2. Supporting beam according to Claim 1, characterized in that the profile piece (11) is hollow and its wall thickness is arranged to vary at different points in the cross-sectional plane.
3. Supporting beam according to Claim 1 or 2 , characterized in that the profile pieces (11) are arranged in such a way that most of the composite material is on the circumference of the supporting beam (10) .
4. Supporting beam according to any of Claims 1 - 3 , characterized in that in the cross-sectional plane the outer lines of the supporting beam (10) are formed from several consecutive arcs, which are fitted smoothly into each other.
5. Supporting beam according to Claim 1 or 2 , characterized in that the profile piece (11) is a polygon, at the corners of which the wall thickness is greater than elsewhere in the profile piece (11) .
β. Supporting beam according to any of Claims 1 - 5, characterized in that the wall thickness of the profile piece (11) is 2,5 - 10 mm, preferably 4 - 8 mm.
7. Supporting beam according to any of Claims 1 - 6, characterized in that the profile pieces (11) in the supporting beam (10) have a mutually similar shape and dimensioning.
8. Supporting beam according to any of Claims 1 - 6, characterized in that the supporting beam (10) includes two types of profile piece (11) , which are arranged to be attached to each other at least partly by means of shape-locking.
9. Supporting beam according to any of Claims 1 - 8 , characterized in that there are 2 - 5, preferably 2 - 3 profile pieces (11) in the supporting beam (10) .
10. Supporting beam according to any of Claims 1 - 9, characterized in that the profile piece (11) includes protrusions (13) and recesses (12) dimensioned according to each other, arranged in such a way that, in the supporting beam (10) a protrusion (13) in one profile piece (11) will coincide with a recess (12) in an adjacent profile piece, in order to attach the profile pieces to each other to form a load-bearing structure.
11. Supporting beam according to Claim 10, characterized in that the supporting beam (10) includes a support piece (14) , which is arranged to be attached to a protrusion (13) or recess
(12) in a profile piece (11) , by means of a corresponding structure belonging to the support piece.
12. Supporting beam according to Claim 11, characterized in that the support piece (14) is arranged to move axially in the protrusion (13) or recess (12) , relative to the supporting beam
(10) .
13. Supporting beam according to any of Claims 1 - 12 , characterized in that the supporting beam (10) includes longitudinal stiffeners (18) , which are fitted to the outer circumference of the supporting beam (10) .
14. Supporting beam according to any of Claims 1 - 13, characterized in that, for support, the supporting beam (10) includes an end piece (20) fitted to each end, the shape of which essentially corresponds to the supporting beam (10) formed of profile pieces (11) , and which at least partly extends inside the supporting beam (10) .
15. Supporting beam according to any of Claims 1 - 14, characterized in that the supporting beam (10) is arranged to be supported on a web-forming machine, to the width of which the length of the supporting beam (10) essentially corresponds.
16. Method for manufacturing a composite-construction supporting beam, in which method ,a load-bearing structure is create by joining in parallel to each other adjacent elongated profile pieces (11) of a composite material, and supporting the supporting beam (10) at its ends, characterized in that a blank corresponding to the profile piece (11) is manufactured from the composite material by pultrusion, and from which blank profile pieces (11) the length of the supporting beam (10) are cut, which are joined to each other to create the supporting beam (10) .
17. Method according to Claim 16, characterized in that in manufacture similar full-length profile pieces (11) are used, which are joined to each other in an unmachined form.
18. Method according to Claim 16 or 17, characterized in that the profile pieces (11) are joined to each other by shape- locking and/or gluing.
19. Method according to any of Claims 16 - 19, characterized in that the supporting beam (10) is reinforced by gluing stiffeners (19) to the profile pieces (11) .
20. Method according to any of Claims 16 - 19, characterized in that the supporting beam (10) is arranged for a web-forming machine and the length of the blank is arranged to be greater than the width of the web-forming machine.
EP06808023A 2005-11-09 2006-11-08 Composite-construction supporting beam and method for manufacturing a corresponding supporting beam Withdrawn EP1963566A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20055598A FI117833B (en) 2005-11-09 2005-11-09 Composite supporting beam for web-forming machine has elongated profile pieces joined to each other to form load-bearing structure and individually set as full-length pultrusion piece extended over full-length of beam construction
PCT/FI2006/050482 WO2007054619A1 (en) 2005-11-09 2006-11-08 Composite-construction supporting beam and method for manufacturing a corresponding supporting beam

Publications (1)

Publication Number Publication Date
EP1963566A1 true EP1963566A1 (en) 2008-09-03

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ID=35458839

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EP06808023A Withdrawn EP1963566A1 (en) 2005-11-09 2006-11-08 Composite-construction supporting beam and method for manufacturing a corresponding supporting beam

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Country Link
EP (1) EP1963566A1 (en)
FI (1) FI117833B (en)
WO (1) WO2007054619A1 (en)

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ITBO20090249A1 (en) * 2009-04-21 2010-10-22 Poggi Mauro ROLLER CLEANING DEVICE.

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Publication number Priority date Publication date Assignee Title
FI115474B (en) * 2003-11-21 2005-05-13 Metso Paper Inc Reinforcing the structures of manufacturing or finishing devices of paper web involves fastening stiffening member(s) made of composite material on box beam structures outer surface
DE102004005087A1 (en) * 2004-02-02 2005-08-18 Voith Paper Patent Gmbh Support beam in fiber-reinforced composite material, used in papermaking machine, has fiber orientations selected to minimize coefficient of thermal expansion
FI120915B (en) * 2004-08-27 2010-04-30 Runtech Systems Oy Beam Construction
FI117017B (en) * 2004-10-26 2006-05-15 Metso Paper Inc Beam construction for a paper, cardboard or finishing machine
FI117712B (en) * 2005-06-17 2007-01-31 Metso Paper Inc Composite scraper assembly

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Title
See references of WO2007054619A1 *

Also Published As

Publication number Publication date
FI117833B (en) 2007-03-15
WO2007054619A1 (en) 2007-05-18
FI20055598A0 (en) 2005-11-09

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