CZ345599A3 - Apparatus for spreading and distributing particles on material band - Google Patents

Abstract

Device for spreading and positioning particles on the material strip is intended for spreading and positioning binder coated wood fibers for wire mesh or conveyor belt for the production of fibreboard. The material strip (9) moves relative to said one equipment. The apparatus includes forming rollers (7) having a plurality of transverse to the direction of movement of the material strip (9) arranged and a rotatable support shaft (11) spaced, v essentially oblique, spacing means (12) which are rotate the rotary shaft (11). Several carriers of shafts (11.1 l, 1 lb, 1 lc, 1 ld, 1 l, 1 lf) with spacers the means (12) is arranged in succession with increasing with the height being arranged so that the spacing the means (12) extending down into the material strip (9). So are particles due to rotation of the spacing means (12) material strip (9)

Description

Apparatus for spreading and distributing particles on a material web

Technical field

The invention relates to an apparatus for spreading and distributing particles onto a material web, such as spreading the adhesive-coated wood fibers onto a wire mesh or conveyor belt for the purpose of producing fibreboard, wherein the material web is moved relative to said device comprising several transverse to a direction of movement of the material web disposed by substantially inclined spacing means disposed along the rotating support shaft and rotating together with said rotating support shaft.

BACKGROUND OF THE INVENTION

In a fiberboard forming station, it is currently necessary to place binder or adhesive coated wood fibers on a wire mesh or conveyor belt into a layer of a certain thickness. The wood fiber layer is conveyed by means of said wire mesh or a conveyor belt to a pressing machine, where the wood fibers are compressed under high pressure and temperature into a continuous board.

A device of the above-mentioned type is already known, for example, from the international patent application PCT / SE 95/01402, the purpose of this solution being to align the material web after air particle distribution.

Another type of alignment or milling is described in U.S. Pat. No. 5,496,570, wherein the device comprises a scraper or alignment device, which accordingly cuts off excess wood fibers.

The disadvantages of such prior art solutions are that a large number of wood fibers are recirculated back into the process by said alignment or milling, which is very disadvantageous because the quality suffers due to wear.

U.S. Pat. No. 5,496,570 also describes how a plurality of disk rolls are used to distribute wood fibers and to grind any lumps in wood fibers.

Another similar device for spreading or spreading wood fibers with the aid of disc rolls is already known, for example, from SE 436 627.

Common to both of the aforementioned patents is that the disc rolls are located above the level of wood fibers and by using successive different distances between the rolls of different disc rolls it is possible to achieve sorting and directional orientation of the wood fibers in several different layers. The disadvantage, however, is that the placement in the material web is unsatisfactory.

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SUMMARY OF THE INVENTION

SUMMARY OF THE INVENTION It is an object of the present invention to achieve a uniform homogeneous layer of wood fibers having the desired spacing along the entire width of the web.

Another object is to ensure the placement of the wood fibers in such a way as to eliminate the need for any significant subsequent alignment or milling.

The foregoing objects have been achieved in accordance with the present invention by providing a device for spreading and distributing particles onto a material web of the type set forth in the introduction to this disclosure.

SUMMARY OF THE INVENTION The present invention is characterized in that several support shafts with spacing means are arranged successively with increasing height, and are arranged such that the spacing means extend down into the material web, with particles on each support shaft being rotated by the spreading means means spread over the material web.

In a preferred embodiment of the present invention, the support shafts are attached to a common frame which is arranged at an angle to the material web so that several layers are formed one above the other, the thickness of said layers and thus the thickness of the resulting material web determined by said angle.

• 9 9 9 9 • 9 9 9 9

99 9

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be explained in more detail below with reference to the accompanying drawings, in which:

Fig. 1 is a schematic side view of a fiberboard forming station;

Fig. 2 is a schematic axonometric view of a device according to the present invention;

Fig. 3 is a schematic view of a forming roller;

Fig. 4 is a schematic axonometric view of a plurality of forming rolls arranged in accordance with the present invention; and Fig. 5 is a schematic view of a preferred embodiment of the deployment means;

Fig. 6 is a schematic view of a different alternative preferred embodiment of the deployment means;

Fig. 7 is a schematic view of another different alternative preferred embodiment of the deployment means;

Fig. 8 shows a schematic view of yet another different alternative preferred embodiment of the deployment means;

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Fig. 9 is a schematic view of the last different alternative preferred embodiment of the deployment means.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1 shows a fiberboard forming station comprising a cyclone 1 for feeding adhesive-coated wood fibers. These wood fibers are fed through the filter 2 to the dispenser 3 for dispensing wood fibers. This dispenser container 3 is provided with means 4 for feeding wood fibers to the belt weigher 5. Beyond this belt weigher 5 the wood fibers pass through a spreading device 6, which may be provided with wings, vanes, discs, pins or other known means for fluffing wood fibers and for placing them on a plurality of forming rolls 7.

Said forming rolls 7 may be adjusted at different angles depending on the desired thickness of the wood fiber layer. The forming rolls 7 feed the wood fibers to the wire mesh 8 or to the conveyor belt for the purpose of transporting them to the pressing station (not shown).

The drawings show how the individual devices for feeding wood fibers up to the forming rolls 2 are placed in line with the wire mesh 2 or the conveyor belt, but these devices can naturally also be positioned such that the feeding of wood fibers is carried out perpendicularly with respect to to the wire mesh 2 or to the conveyor belt.

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FIG. 2 shows a more detailed view of the spreading devices 6, which are followed by the forming rolls 7 and the material belt 9 formed on the wire mesh 6 or on the conveyor belt. The forming rolls 7 are attached to a common frame 10 which is arranged at an angle α with respect to the material web 9.

Referring to FIG. 3, there is shown a forming roller which is disposed transversely to the direction of travel of the material web 9 and comprises a rotatable support shaft 11 provided with a plurality of spacing means 12. These spacing means 12 are disposed along the rotating support shaft 11 and consist of in a first preferred embodiment of the present invention, a plurality of oblique and substantially elliptical disks or similar disk-shaped means that rotate together with said rotatable support shaft 11. The spreading means 12 extend downwardly into the material web 9.

The term "inclined discs" also includes discs that are in fact arranged in a straight line on the rotatable support shaft 11, but which by means of bending or the like have at least one resulting oblique surface that acts in the material web 9.

The rotatable support shaft 11 and the spacing means 12 may be of the type described in International Patent Application PCT / SE 95/01402, wherein the spacing means 12 are arranged at certain axial distances from each other for rotation purposes together with the support shaft 11, and Around its shorter diameter are arranged

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at an angle to the support shaft 11 in such a way that they have a circular axial projection.

In addition, the spacing means 12 are arranged such that the axial distance between adjacent adjacent discs is such that the discs overlap in the axial direction, and in addition said discs are inclined at an angle of 45 ° to 80 °, preferably at an angle of 60 ° With respect to the rotatable support shaft 11. During rotation, these disks of the locating means 12 cause the wood fibers to return in the axial direction back and forth in the imaginary horizontal straight tube.

Referring to FIG. 4, a plurality of rotatable support shafts 11a to 11f are provided in succession with increasing height from the surface of the material web 9, and are arranged such that the spacing means 12 project substantially downwardly into the material web 9. As a result the particles by means of each rotating support shaft 11a to 11f are spread on the material web 9 into the same layers 13a to 13f of uniformly distributed particles due to the rotation of the positioning means 12.

FIG. 5 shows a second alternative embodiment of the deployment means 12, which consists of an elliptical disk provided with openings 14 through which wood fibers can be conveyed. These openings 14 may have any suitable shape, but are preferably delimited by arms or spokes 15 or similar means formed between the openings 14.

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The arms or spokes 15 may also have a rounded shape or other suitable shape in order to convey the wood fibers in the desired direction during operation of the propeller impeller. Each disc may naturally be provided with protrusions, protrusions or the like distributed around its periphery to enhance the effect of said transport of wood fibers.

FIG. 6 shows a third alternative embodiment of the deployment means 12 according to the present invention, wherein the elliptical disk is provided with recesses to form blades 16 or blades 16 or the like by which the wood fibers can be transported in the desired direction .

Thus, the deployment means 12 according to this embodiment extend only partially around the rotatable support shaft 11. It is also possible to vary or vary the shape of the various deployment means 12 in accordance with this embodiment to achieve different properties along the rotatable support shaft 11, and in such a way as to achieve the desired spreading of the wood fibers.

FIG. 7 shows a fourth alternative embodiment of the deployment means according to the present invention, in accordance with which the elliptical disk is provided with a ripple 17 or similar surface structure for the purpose of guiding wood fibers. Also, the undulations 17 may be shaped in such a way that the operation of the propeller impeller contributes to the distribution of the wood fibers in the desired direction.

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FIG. 8 illustrates a fifth alternative embodiment of the deployment means 12 of the present invention wherein a plurality of protruding pins 18 or the like form an elliptical flat planar brush to distribute wood fibers.

FIG. 9 shows a sixth alternative embodiment of the deployment means 12 of the present invention wherein the impeller blades 19A to 19D or the like are arranged along a rotatable support shaft having a rectangular cross section in this embodiment. The outer edge 20 of the two opposite blades or sheets 19A and 19B, as well as 19C and 19D, located on opposite sides 21A and 21B, as well as 21C and 21D of the rotatable support shaft 11, extends along a common elliptical path.

In this embodiment, the elliptical path of the opposing propeller blades 19A and 19B is arranged at an angle to the elliptical path of the propeller blades 19C and 19D. As a result, the spacing means 12 may be placed closer together, and the shape of the various spacing means 12 may be alternated in accordance with this embodiment to achieve different properties along the rotatable support shaft 11 in such a way as to achieve the desired wood fiber distribution.

The rotatable support shafts 11a to 11f are arranged at an angle to the material web in such a way that several identical layers 13a to 13f are formed one above the other, the thickness of said layers, and

hence the thickness of the resulting material web is given by said angle of inclination.

In the drawings, the positioning means 12 are directed in the same direction for different rotatable support shafts 11, but they can naturally also be directed in different directions within the scope of the invention.

It is also possible to adjust or adjust the inclination of the common frame 10 at an angle transverse to the material web 9 in such a way that the resulting cross-sectional profile of the material web 9 has the desired shape. By attaching the rotating support shafts 11a to 11f in the common frame 10 in an adjustable manner, each rotating support shaft 11a to 11f being individually adjustable in the vertical direction, the thickness of the respective layer 13a to 13f can be influenced. This is particularly important for the uppermost forming roll 7, which affects the thickness of the uppermost layer 13f.

It will be appreciated that the rotary support shafts 11a to 11f may also be spaced separately longitudinally to the material web 9 to achieve different distances between said rotary support shafts 11a to 11f or to achieve different slopes of the respective rotary support shafts 11a to 11f, due to whereupon the distribution and distribution of the wood fibers within the respective layers 13a to 13f can be influenced.

Another possibility to influence the spreading and distribution of the wood fibers within the respective layers 13a to 13f is that the rotatable support shafts 11a to 11f will be individually adjustable per se, so that each flfl ·

The rotating support shaft 11a to 11f is shaped in a manner known per se so that the respective rotating support shaft is deflected in a certain direction during operation.

Claims (12)

Apparatus for spreading and distributing particles on a material web (9), such as binder coated wood fibers on a wire mesh (8) or a conveyor belt for the production of fibreboard, the material web (9) being moved relative to said apparatus comprising several transversely to the direction of movement of the material web (9) and around the rotatable support shaft (11) of the substantially inclined spacing means (12) that rotate with said rotatable support shaft (11), in that a plurality of support shafts (11a to 11f) with the spreading means (12) being arranged successively with increasing height, being arranged such that the spreading means (12) extend down into the material web (9), with particles on each support shaft (11a to 11f) as a result of the rotation of the deployment means (12) woven onto the material belt (9). Device according to claim 1, characterized in that the support shafts (11a to 11f) are attached to a common frame (10) which is arranged at an angle (α) to the material web (9) such that several layers (13a) are formed. to 13f) above each other, wherein the thickness of said layers (13a to 13f) and hence the thickness of the resulting material web (9) is determined by said angle (α). Device according to claim 2, characterized in that the frame (10) is adjustable at an angle transverse to the material web (9) such that the frame (10) is adjustable such that φφ φ The cross-sectional profile of the resulting material web (9) is determined by the indicated angle. • φ φ φ φ φ φ φ φ φ φ φ φ Apparatus according to claim 2 or 3, characterized in that the support shafts (11a to 11f) are adjustablely mounted in the frame (10), wherein each support shaft (11a to 11f) is individually vertically adjustable to influence the thickness of the respective layer (13a). to 13f). Device according to any one of claims 2 to 4, characterized in that the support shafts (11a to 11f) are adjustablely mounted in the frame (10), wherein each support shaft (11a to 11f) is separately displaceable in the longitudinal direction of the material web (9). ) to establish different distances between said support shafts (11a to 11f) or to adjust the inclination of respective support shafts (11a to 11f) to influence the distribution of wood fibers within the respective layer (13a to 13f). Method according to any one of claims 2 to 5, characterized in that the support shafts (11a to 11f) are individually adjustable such that each support shaft (11a to 11f) has a deflection in a certain direction during operation to influence the distribution of wood fibers within respective layers (13a to 13f). Device according to any one of claims 1 to 6, characterized in that the at least one deployment means (12) consist of an elliptical disk. • 99 · Device according to claim 7, characterized in that at least the elliptical disk is provided with openings (14) through which the wood fibers can be transported. Device according to claim 8, characterized in that the spokes (15) or the like between the apertures (14) are twisted or otherwise shaped such that the operation of the propeller impeller causes the transport of wood fibers in the desired direction. Apparatus according to any one of claims 1 to 9, characterized in that the at least one deployment means (12) are provided along their circumference with protrusions or similar means which are designed such that the operation of the propeller impeller causes the transport of wood fibers in the desired direction. Apparatus according to any one of claims 1 to 6, characterized in that the at least one placement means (12) at least partially consist of an elliptical disk provided with recesses formed in such a way that the blades (16) of the propeller impeller or the like are provided. through which the wood fibers can be transported in the desired direction. Apparatus according to any one of claims 1 to 6, characterized in that the at least one deployment means (12) consist of an elliptical disk provided with an undulation (17) or a similar surface structure for transporting wood fibers. • φ · • · · · * · * · * · * · * · - 15 - ** · ·· ....... * · · ’ 13. Equipment according to any of them of claims 1 to 6 ..... merging with e by at least one positioning means (12) are fitted with a larger one number protruding Pins (18) or similar means, which are arranged in the form of an elliptical planar brush for transporting wood fibers.