FI117833B - 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 - Google Patents

Abstract

Composite elongated profile pieces (11), arranged parallel to each other, have adjacent pieces joined to each other to form a load-bearing structure. Each profile piece is a full-length pultrusion piece extended over the full-length of the beam construction. An independent claim is included for a composite beam manufacturing method.

Description

117833

COMPOSITE STRUCTURAL BEARING FOR A MACHINE FORMATION AND FOR THE MANUFACTURE OF A METHOD-BASED BEARING BEAR

The invention relates to a composite support beam 5 for a web forming machine having a length of support beam substantially equal to the width of the forming machine, which is

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adapted to be supported at their ends on a web forming machine, and comprising composite and elongated profile pieces which are arranged in parallel and connected to each other to form a supporting structure. The invention also relates to a corresponding manufacturing process.

Finnish patent application number 980679 discloses a support beam for a paper or coating machine.

15 The support beam includes a plurality of profile elements bundled together in composite material. Thus, the profile elements together form a support beam, which further comprises a mounting element for the work unit supported by the support beam. In practice, the load-bearing capacity of the support beam 20 is determined by the profile elements and their number. In other words, increasing the number of profile elements can increase the load-bearing capacity of the support beam. In addition, the composite material is • · · lighter than steel.

The above support beam is made of the profile elements shorter than the support beam. In other words, the forming beams;

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in the transverse direction of the machine, each profile element consists of several • «* · *** pieces. This complicates the manufacture and especially the support. . beam endurance suffers. Secondly, the supporting beam • · · · 30 favors substantially round profile elements, which are * * easy to manufacture, for example by fiber winding. Instead, positioning the round profile elements in a regular

*: * · Your bundle is difficult. In addition, the adjacent profile element I

there is little common contact between the road, which weakens the structure and makes it difficult to manufacture. The same applies to attaching the fastening element to a bundle of i 2 117833 formed of profile elements. The support beam also forms an indistinct surface, which collects impurities.

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The object of the invention is to provide a new composite support beam for the forming machine 5, which is lighter but stiffer than before. It is a further object of the invention to provide a novel method of manufacturing a composite beam for a web forming machine which is simpler and * 10 more secure and capable of producing various beam.

Characteristic features of the support beam of the present invention are set forth in the appended claim 1. Accordingly, features of the method of the invention are disclosed in the accompanying claim 15. In the support beam 15 of the invention, the profile pieces are manufactured in a novel manner and are surprisingly shaped. This allows the profile pieces to be joined more easily but more firmly than before. In addition, the overall support beam is lighter but more rigid than before. By designing the profile pieces 20, other features that enable and facilitate the use of the support beam can be incorporated therein. In addition, • ψ. · £ *. the properties of the beam can be simply changed.

; . ·. The method according to the invention can simply ***. manufactures support beams for different positions and multi-plate • · · • · t ·; 25 for forming machines. In addition, the adjacent profile cap • * · · ** ·. · * ·. the diaphragms can be connected securely and precisely in the desired manner.

The invention will now be described in detail with reference to the accompanying drawings, illustrating some embodiments of the invention, in which ** ♦ · '; * · *. Fig. 1a shows the first «:; *** j of the support beam according to the invention in a side view, • ♦ · 35 Fig. Ib shows a modification of the beam la of Fig. La,! 3, 117833

Figure 2 is a side view of another embodiment of a beam of the invention,

Figure 3 is a side view of a third embodiment of the beam of the invention; Figure 4 is an axonometric exploded diagram of the fourth embodiment of the beam of the invention in its entirety.

In a web forming machine, such as paper, board 10 or post-processing machines, support beams are used at many positions supported only at their ends on the frame of the web forming machine. In other words, the length of the support beam substantially corresponds to the width of the forming machine. The function of the support beam is to support another device, such as 15 gauges, an applicator head or a doctor blade with a blade holder. In particular, the scraper blade of the scraper device is loaded, whereby the load-bearing beam requires good load-bearing capacity and stiffness in different directions.

Figures 1-4 illustrate various applications of the beam of the invention. In addition to the scraper equipment shown, the * · · * »carrier beam can also be used in other positions and • * ·:. positions. Generally, the support beam includes composite material * i · • · · * j. *. elongated and elongated profile pieces. * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * For example, fiberglass, carbon or aramid fibers may be used as reinforcement. Similarly, the polymer is, for example, epoxy or polyester. In addition, the profile pieces in the bracket beam are · · * aligned and connected side-by-side to form a load-bearing structure. The use of composite material ***** provides a lighter structure than steel. In addition, •] '' '** the deformation of the support beam caused by the thermal load is: steel *: *. smaller than the kennet. According to the invention, each profile piece is ΐ • j · j. ***. a full length pultrusion piece extending to substantially the entire length of ♦ * 35 beam structures. Thereby no discontinuities are formed in the supporting beam, which results in a durable structure and a homogeneous strength of 1: 4 117833. In addition, the support beam is made !! simpler.

According to the invention, the support beam is made of hollow bolt-5 die bodies. Thus, the amount of composite material relative to the achieved size remains reasonable. At the same time, the ratio of stiffness to weight is good. The structure of the support beam can be further optimized by adjusting the wall thickness of the profile piece at different points in the cross-sectional plane. This allows the composite material to be placed where it is most useful. In general, according to the invention, pultruded profile pieces are arranged such that the majority of the composite material is on the circumference of the support beam. The stiffness to weight ratio is further improved.

15 The shape of the support beam also affects the load capacity. According to the invention, in the cross-sectional plane, the outline of the carrier beam consists of a plurality of successive arcs which are smoothly arranged with one another. Preferably, the end result is a symmetrical and circular appearance. Further, the mutual walls 20 of the profile pieces form a honeycomb inside the support beam, which further increases the stiffness and loadability of the support beam.

Käyt • • Käyt Käyt Käyt: Käyt: össä: össä össä::: Käyt Käyt: Käyt Käyt Käyt Käyt Käyt Käyt: össä:: Käyt Käyt Käyt össä Käyt Käyt Käyt Käyt Käyt Käyt Käyt Käyt Käyt Käyt Käyt Käyt: Käyt Käyt Käyt Käyt Käyt Käyt Käyt Käyt Käyt Käyt Käyt Käyt Käyt Käyt Käyt Käyt Käyt Käyt Käyt Käyt Käyt Käyt Käyt Käyt Käyt Käyt Käyt Käyt. ♦ ♦ ♦ ♦ ♦♦ «; . ·. 25 parallel to each other. In addition, the length of the support beam • · · ··· *. is adapted to the width of the forming machine and the support beam is • • · · supported at its ends to the forming machine. According to the invention, a composite material is formed by pultrusion * * * y. '..' a profile piece corresponding to a profile piece, the length of which is adapted to be larger than • · * Γ 30. In practice, the pultrusion '*** can produce preforms substantially longer than the width of the forming machine, preferably of a multiple of said width. In this case, the blank can simply be cut into profile pieces of length * which are joined together to form a beam *. This method makes it easy and quick to make various support beams by combining a sufficient number of profile pieces of the desired length.

Fig. 1a shows a first embodiment of a support beam 10 5 according to the invention. Here, the actual load-bearing structure consists of two interconnected profile pieces 11. Correspondingly, in the embodiment of Fig. Ib, four profile pieces 11 are connected together. Functionally similar parts are referred to by the same reference numerals. According to the invention, the profile piece 10 is a polygon with a different thickness at different points in the cross-sectional plane. Thus, firstly, a large contact surface is obtained in the polygon between adjacent profile pieces. With the appropriate dimensioning, the finished support beam also forms a smooth surface with no dirt collecting projections. By changing the settings of the secondary pultrusion device, the wall thickness of the profile piece can be easily adjusted to the desired one. In other words, the composite material can be placed where it is needed. Hereby, the stiffness weight ratio of the support beam is optimized. In other words, the beam 20 is made as rigid as possible with as little material as possible.

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There are many factors that influence the dimensioning of a profile, but j *. according to the invention, the wall thickness at the corners of the polygon is greater * * * ·:. than the rest of the profile piece. Then the stronger wall sections - ·· «·:. 25 are located on the outer perimeter of the support beam and at the nodes, * # · w • · * ·. ***. whereby good stiffness is achieved. In addition, the opposing thinner wall sections reinforce each other, which prevents them from collapsing. This structure is easy to accomplish • · * specifically through pultrusion, also called extrusion.

* ♦ «· ·. According to the invention, the wall thickness of the 30 '* profile piece is, on average, 2.5 - 10 mm, more preferably 4-8 mm. Thus, in the light of the above, the thickest parts are at the corners of the polygon and respectively

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· ***: thinner sections between corners. Applying a number of reinforced polygons • · · .1 35, even with surprisingly thin wall thickness, provides a load-bearing structure, which in addition has a favorable vibration characteristics. In other words, the distance between the angles is sufficient to achieve stiffness. In addition, the formed honeycomb structure also has resilient portions which effectively dampen vibrations due to external excitations.

Fig. 2 shows another embodiment of a support beam 10 according to the invention. In general, the profile pieces in the bracket beam have the same shape and dimensions. This 10 is realized in addition to the embodiment of Figure 2 in the applications of Figures 1a and Ib. Using similar profile pieces, it is sufficient to produce one type of blank. The blank is then cut into the required number of profile pieces of support beam length, which are joined together. According to the invention, there are 2 to 5, more preferably 2 to 3, profile pieces in the 15 support beams. By using sufficiently large profile pieces, even a few profile pieces provide sufficient load-bearing capacity for the support beam. At the same time, the construction of the support beam remains simple and the alignment of the profile pieces is easy.

• · • · · · · · ·

The fabricability of the beam can be further improved and: increased durability. According to the invention, the profile part comprises · · • · · ·:, ·. projections and recesses dimensioned according to each other • 1 2 h · · »:. 25 arranged so that the projection of one profile piece * · i • · 1 2, ··· in the bracket bar hits a recess of another adjacent profile piece • · to connect the profile pieces to the supporting structure. form. The triangular profile of Figure 2 has three recesses 12 on one straight side of the pieces 11. In addition, • m T 30 has correspondingly similar projections 13 on the other straight side 13. This solution makes it easy to align the profile pieces ···· 2 2 · locking “reinforces the structure of the support beam. Profile pieces in Figure 2 .3. 11 should be installed by pushing its ends. The simpler '3 • · · 35 projections and recesses allow the profile pieces to be laterally aligned. The number, shape and placement of the recesses and the corresponding protrusions 7 117833 may vary from one application to another.

The diversity of shape locking shown in Figure 2 also has another purpose. According to the invention, the support beam includes a support piece which is adapted to be fastened to a projection or recess of the profile piece by a corresponding structure belonging to the support piece. In the support piece 14 of Fig. 2 there is fitted a blade holder 15 with a doctor blade 16. In addition, the support member 14 has lances 17 of a shape and dimension corresponding to the recesses 12.

In this case, the support piece 14 is arranged in the recess 12 axially; further moving relative to the support beam 10. This feature can be used, in particular, to oscillate the blade holder 15 while the carrier beam 10 remains stationary. In Figures 1a and Ib 15, the support member 14 is Y-shaped and is fixedly fixed to the support beam 10.

A third embodiment of the support piece 14 is shown in Figure 3, in which the recess is formed between two profile pieces 11. With the appropriate choice of materials 20, even such support can be oscillated. , ·

Unlike before, there are two types of • · · • ·. *: * ♦ profile pieces that are used here in total. Two profile caps •; . ·. the pieces are mirror images of each other, allowing them to be manufactured with the same die, which reduces manufacturing costs. Also, the shape of the third profile piece 11 · · · j * V 25 is symmetrical, which facilitates manufacturing. In addition, adjacent profile pieces have a large amount of common contact surface and profile pieces. . There are angles that fit into each other, which facilitates the production of the support beam with the profile pieces remaining in the correct position • * * "30 relative to each other. In general, the support beam 10 ***** includes two types of profile pieces according to the invention. 'ί is adapted to be joined at least in part by means of a shape lock. The shape locking is achieved by the central shape and dimensioning of the profile pieces. For example, in Fig. 3 * · ♦ · ·. ·'; In lightly loaded positions, the profile piece may be a thin arch, which is glued to the other profile pieces, and on the other hand, using a sturdy profile piece, which may even contain multiple cells, substantially increases the load capacity and stiffness of the support beam.

The design of the profile pieces, the material thicknesses at the corners and the combination of the profile pieces provide a very load-bearing and rigid support beam. The stiffness and / or vibration properties of the support beam 10 can be further improved by fitting longitudinal stiffeners to the support beam. Preferably, the stiffeners are disposed on the outer circumference of the support beam, where they have the greatest effect. On the other hand, stiffeners 15 may also be attached to a single profile piece prior to joining the profile pieces to a support beam. In addition, stiffeners can be retrofitted in the event of problems with the support beam. Preferably, the stiffeners 18 are simple stiffeners 19 of composite material, which are easy to fabricate and fasten (Figure 3). In addition, higher quality and / or standardized materials may be used in the manufacture, which • • · • • have a higher sales than other materials. lower. This will keep the overall cost as low as possible as the support bar properties rise to a new level. The sizing and placement of the stiffeners are determined individually in the • * ·, ··. Support bracket and position so that the individual requirements can be individually * * · fulfilled. 1 • «• · * * · · Λ

Thus, according to the invention, I is used in the manufacture of the beam

• · • · 30 pultrusion. In addition, similarly sized profile pieces are preferably used, although with slightly more complicated profile pieces, the support beam properties can still be: * · *: improved. In addition, pultrusion pieces can be joined to each other without machining, which speeds up and simplifies manufacturing; • · ♦ 35 ta. The polygonal profile pieces have a large contact surface with each other, so that 9 117833 is preferably used for gluing. In addition to or in addition to gluing, the profile pieces can be attached to one another by means of a form lock. Preferably both methods are used simultaneously, which speeds up and facilitates the preparation. At the same time, the strength of the beam 5 is improved. For example, screws are avoided to prevent the formation of discontinuities. Durability and load capacity and other properties can be further enhanced and improved by gluing stiffeners to the profile pieces. Here, the desired properties 10 can be obtained for each application without oversizing the support beam.

Figure 4 further illustrates an embodiment of a support beam 10 according to the invention, in which two symmetrical profile pieces 11 are intended to be joined by gluing. In this 15 embodiment, a plurality of narrow support pieces 14 are used to which the blade holder 15 is attached. In this case, even metal knife holders can be used in the composite carrier beam without problems due to differences in thermal expansion. Further, the support pieces 14 are arranged to be seated in a recess 12 formed between the profile pieces 11. formed heel • · ·; v beam 10 and at least partially extends inside the support beam 10 ♦ · ♦ j * V 25. First, the end piece closes the open structure and the portion 21 extending into the support beam 10 supports the end of the support beam 10. 1 • · 1 'i

In the embodiment of Figure 4, the end piece 20 is stepwise arranged. . In other words, the bracket beam is missing conventional bearings, which further simplifies the overall rail structure. The bracket bar 10 is positioned within the pitch of the bracket 22 and the scraper blade 16 is pressed. **** level against the surface by utilizing the margins of the blade holder 15.

The composite material used to make the beam is preferably carbon or fiberglass reinforced plastic. Also:; 4> '· 1 o 117833 their combinations can be used, and especially in smaller stiffeners, expensive materials, such as boron fiber, can be used. These materials are also insensitive to temperature fluctuations, whereby separate insulators are unnecessary. The profile pieces can be produced by pultrusion quickly and cost-effectively, the profile pieces cut from the blank are easily connected to each other for each application, and the end pieces for different structures can be made, which makes the support beam much faster than the invention. In addition, its properties can simply be changed afterwards.

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Claims (18)

A composite structural support beam for a sheet forming machine, the length of which the beam (10) corresponds substantially to the width of the sheet forming machine, and which is adapted to support its ends towards the sheet forming machine, and which comprises elongated profile pieces (11) of composite material which are arranged parallel and with each other next to each other to form a supporting structure, characterized in that each profile piece (11) is a full-length profile-drawn piece which extends substantially over the entire length of the beam structure. Support beam according to claim 1, characterized in that the profile piece (11) is hollow and its wall thickness is arranged to be different at different points of a cross-sectional level. Support beam according to claim 1 or 2, characterized in that the profile pieces (11) are arranged so that the main part of the composite material is in the periphery of the support beam (10). • · • · · · · · · * Carrier beam according to claims 1-3, characterized in that *:. *. the contour lines of the support beam (10) in the cross-sectional level consist of several ··· *: successive beaks, which have been sequentially arranged together. • · · • · · · · · · 25 · · · · · · · · · · · · ··. Support beam according to claim 1 or 2, characterized in that • φ the profile piece (11) is a polygon, in whose corner the wall thickness is. larger than in other places of the profile piece (11). • · · • · · * ♦ · • · 30 Support beam according to any of claims 1-5, characterized in that the wall thickness of the profile piece (11) is 2.5 - 10 mm, ·· * • more flexible 4-8 mm. • ♦ • · · • · ♦ • · Support beam according to any of claims 1-6, characterized in that the profile pieces (11) in the support beam (10) in their shape and their dimensions are identical. Support beam according to any of claims 1-6, characterized in that the support beam (10) comprises two types of profile pieces (11), which are arranged to be connected to each other at least partly by forced control. 5 Support beam according to any one of claims 1-8, characterized in that there are 2-5, more preferably 2-3 profile pieces (11) in a support beam. Support beam according to any of claims 1-9, characterized in that the profile piece (11) comprises protrusions (13) and recesses (12) which are dimensioned for each other, arranged so that in a support beam (10) a profile piece (11) is provided. ) protrusions (13) fit into the recess (12) of a adjacent profile piece such that the profile pieces are joined together to form a supporting structure. Support beam according to claim 10, characterized in that the support beam (10) comprises a support piece (14), which is arranged to be secured to the protrusion (13) or recess (12) of the profile piece (11) with a corresponding structure comprising: • · in the support piece. • · · * • · φ · · • · · “V Support beam according to claim 11, characterized in that the support piece (14) is movably arranged in the axial direction in the · · · V / protrusion (13) or in the recess (12), in relation to the support beam (10). . ♦ Carrier beam according to any one of claims 1-12, characterized in that the carrier beam (10) comprises stiffeners (18) in the longitudinal direction, which are arranged on the carrier beam ( 10) outside. • * »• * 0 · * * · Support beam according to any one of claims 1 to 13, characterized in that the support beam (10) for supporting the sheet forming machine comprises a end piece (20) arranged at both ends, the shape of which substantially corresponds to that of the profile pieces (11). formed the support beam 117833 (10), and which at least partially tracks into the support beam (10). A method of producing a composite structural support beam for a sheet forming machine, according to which a supporting structure is created by joining elongate composite pieces (11) of composite material, and the length of the supporting beam (10) is arranged to correspond to the width of the sheet forming machine and the support beam (10) is supported at its opposite ends to the sheet forming machine, characterized in that the composite material is produced by means of profile drawing, a blank corresponding to the profile piece (11), the length of which is arranged greater than the sheet forming machine, and of which blank the profile pieces (11) of the supporting beam ( 10) lengths which are joined together to form a support beam (10). . Process according to claim 15, characterized in that identical full-length profile pieces (11) are used in the manufacture, which are joined together without machining. 20 17. A method according to claim 15 or 16, characterized in that the profile pieces (11) are attached to each other by forced guide 11 and / or by gluing. • · · • · · · · · i · · * · · | 1V 25 Method according to any of claims 15 - 17, characterized in that the support beam (11) is reinforced by gluing • ♦ stiffeners (18) on the profile pieces (11). '»· · • 1 · * 1 · • · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·; • · · · · · · · · · · #