CN210820055U - A back wall and dispenser for wind spreader chamber of dispenser - Google Patents

Abstract

The present invention relates to a rear wall for a wind distribution chamber of a distribution machine, which rear wall has at least one external rear wall section and at least one internal rear wall section, between which at least one suction channel is realized for drawing air and particles out of the internal space of the wind distribution chamber, which at least one suction channel has at least one suction opening leading into the internal space of the wind distribution chamber, which at least one suction opening is located in or beside the at least one internal rear wall section, at least one projection being arranged at the level of the edge located below in the space of the at least one suction opening in the normal operating position of the distribution machine, which at least one projection projects towards the inside of the wind distribution chamber beyond the inner side located above in the space of the at least one internal rear wall section. The utility model discloses still relate to a scatter machine. By means of which the risk of contamination of the scattering mat by clumps of scattering material falling from the rear wall of the wind scattering chamber can be reduced.

Description

A back wall and dispenser for wind spreader chamber of dispenser

Technical Field

The utility model relates to a back wall for wind spreader chamber of dispenser, wherein, the dispenser is arranged in the in-process that is located the following press in the production direction and produces the material board and takes to form on the shaping and spreads the material pad.

Furthermore, the invention relates to a spreader for forming a spread mat on a forming belt during the production of material boards in a press located at the rear in the production direction, the spreader having at least one wind spreading chamber at the end of which a rear wall is arranged.

Background

The known spreading machines on the market have an air spreading chamber for forming a mat of spread material on a forming belt during the production of material boards in a press located after in the production direction. A rear wall is arranged at the wind distribution chamber, which rear wall limits the interior space of the wind distribution chamber at the ends of the wind distribution chamber. It has been shown that, when the spreader is in operation, the spread transported by means of the air flow in the wind spreading chamber may fly against the rear wall and may remain attached (adhered) at the rear wall. Where the scatter can collect and coalesce into clumps of scatter material. Clumps of the spread can fall from the back wall onto the forming belt. The spread cake may consist of gummed chips or fibers and dust, in particular wood chips. Such loose cloth clumping can lead to undesirable mess, particularly spots or stains on the surface, on the finished material sheet.

SUMMERY OF THE UTILITY MODEL

The task of the utility model is to design a rear wall and the type of mentioning at the beginning scatter machine, wherein, scatter the risk that the material pad is polluted by the scattered cloth caking that falls from the rear wall of wind scattering room can reduce. Preferably, the formation of agglomerates of the dispersion at the rear wall is avoided.

Alternatively or additionally, the object is achieved for the rear wall in that the rear wall has at least one outer rear wall section and at least one inner rear wall section, between which at least one suction channel is realized for drawing air and particles out of the interior space of the wind distribution chamber, wherein the at least one suction channel has at least one suction opening into the interior space of the wind distribution chamber, which at least one suction opening is located in (on) or beside the at least one inner rear wall section, and at least one projection is arranged at an edge level located below in the space of the at least one suction opening in the normal operating position of the spreader, which at least one projection projects towards the interior of the wind distribution chamber beyond the interior side of the space of the at least one inner rear wall section located above it.

According to the invention, at least one projection is therefore provided, which is located below the at least one suction opening. The downwardly falling particle cake can be captured by means of the at least one projection and sucked away (drawn off) through the at least one suction opening. In this way, it is avoided that agglomerates of particles falling from the inside of the at least one inner rear wall section fall onto the forming belt or onto the scattering mat.

In an advantageous embodiment, the at least one projection can be arranged in the extension of the spatially lower limit of the at least one suction channel. In this way, a transition between the at least one projection and the spatially lower limit can be realized in a stepless manner (continuously). Thus, the particle agglomerates landing on the at least one projection can be better sucked into the at least one suction channel and sucked away (sucked away) through the at least one suction channel.

In a further advantageous embodiment, the spatially lower limit of the at least one suction channel and the at least one projection are formed at least by the respective at least one outer rear wall section. In this way, a seamless and stepless (continuous) surface extension from the at least one projection through the spatially lower limit up to the at least one suction channel can be achieved.

In a further advantageous embodiment, the spatially lower section of the at least one outer rear wall section can be curved (arched) towards the interior of the wind distribution chamber and can together form a spatially lower boundary of the at least one suction channel and the at least one projection. In this way, production can be simplified.

Advantageously, the curvature of the at least one outer rear wall portion may be realized steplessly (continuously). In this way, it may be free of corners and edges to which particles, particularly particle agglomerates, may remain attached.

In a further advantageous embodiment, the at least one projection can project beyond the inside of the at least one inner rear wall section by an amount of between approximately 5mm and 50 mm. On the one hand, the excess can be predetermined to be sufficiently large that the falling particle agglomerates are also reliably captured by the projection. On the other hand, the excess can be predefined to be sufficiently small that the speed of the air sucked at the outer end of the projection is sufficiently high to be able to suck the particle agglomerates located there into the at least one suction channel.

In a further advantageous embodiment, the height of the at least one suction opening, viewed in the direction of the spatially vertical direction, amounts to between approximately 20mm and 110 mm. In this way also larger and heavier particle agglomerates can be sucked.

In a further advantageous embodiment, the at least one projection is adjustable with respect to an excess of the inner side of the at least one inner rear wall section and/or the height of the at least one suction opening in the spatially vertical direction is adjustable. By corresponding adjustment of the suction opening, the air flow can be correspondingly influenced, so that larger and heavier particle agglomerates can also be sucked in. The total amount of air drawn out (sucked away) from the wind distribution chamber cannot be excessive, so that the flow velocity in the interior space of the wind distribution chamber is not too great. Excessive flow velocity in the wind dispersal chamber may have a negative effect on wind screening.

For certain material boards, especially chip boards, a stronger separation of the scatter particles, especially wood chips, depending on the size, and weaker separation for other types, may be desirable. The different separations can be adjusted by different intensities of the air flows in the wind dispersal chamber. It is therefore advantageous if the height of the at least one suction opening is variably adjustable as a function of the total suction quantity. In this way, it is achieved that there is always a sufficiently large flow velocity at the at least one suction opening in order to suck up particle agglomerates and avoid a corresponding attachment (sticking) of particles at the at least one rear wall section.

The excess of the at least one projection can advantageously also be adapted to the size and/or weight of the falling particle agglomerates and in particular to the (prevailing) air velocity present in the region of the at least one suction opening. The suction efficiency can be further improved.

Alternatively or additionally, the object is achieved for the rear wall in that the rear wall has at least one outer rear wall section and at least one inner rear wall section, between which at least one suction channel is realized for sucking air and particles out of the interior space of the wind dispersal chamber, wherein the at least one suction channel has at least one suction opening into the interior space of the wind dispersal chamber, which at least one suction opening is located in the at least one inner rear wall section (on the inner rear wall section) or next to it, and the at least one suction channel has at least one cross-sectional constriction downstream of the at least one suction opening.

According to the invention, the at least one suction channel has at least one cross-sectional constriction behind the at least one suction opening with respect to the sucked air flow. In the region of this cross-sectional constriction, an increase in the flow velocity is achieved. Immediately after the at least one suction opening, the at least one suction channel constitutes a critical region in which there is an increased risk that particles may attach there and may coalesce into particle agglomerates. Locally greater flow velocities in this critical region can be achieved by means of at least one cross-sectional constriction, thereby counteracting the attachment of particles.

In an advantageous embodiment, the at least one suction channel can be constricted from the side facing the interior of the wind distribution chamber. In this way, it is possible to flow freely through the opposite region of the at least one suction opening, which forms a radial outer side with respect to the extension. The flow in the at least one suction channel can thus be improved overall to avoid attachment of particles.

In a further advantageous embodiment, the at least one cross-sectional constriction is arranged directly above the at least one suction opening space in relation to the normal operating position of the wind distribution chamber. In this way, a locally greater flow velocity can be achieved immediately after the at least one suction opening.

In a further advantageous embodiment, the at least one suction opening and the at least one cross-sectional constriction are arranged above the space of the lower limit in relation to the normal operating position of the wind distribution chamber in the space of the at least one suction channel. In this way, the particles sucked out of the wind distribution chamber can be guided directly along the spatially lower limit into the suction channel and can be sucked in there efficiently due to the higher flow velocity in the region of the at least one cross-sectional constriction.

In a further advantageous embodiment, the at least one cross-sectional constriction can extend over the width of the at least one suction channel. In this way, a corresponding increase in the flow velocity can be achieved over the entire width of the at least one suction channel. A more uniform suction can thus be achieved and the air flow in the interior space of the wind dispersal chamber and thus the wind sifting can be (not) negatively influenced can be avoided.

The width is a dimension in the sense of the present invention which, in the normal operating position of the wind distribution chamber, extends spatially horizontally, transversely to the air flow in the interior space and/or transversely to the production direction. The depth (thickness) then extends correspondingly horizontally, parallel to the air flow.

In a further advantageous embodiment, the at least one cross-sectional constriction can be realized by a corresponding curvature of the at least one corresponding inner rear wall section and/or by a corresponding curvature of the at least one corresponding outer rear wall section. In this way, the cross-sectional constriction can be realized more simply. Furthermore, further constructional measures, in particular the application of projecting elements, are therefore not necessary.

In a further advantageous embodiment, the depth (thickness) of the at least one suction channel in the region of the at least one cross-sectional constriction can be between approximately 50mm and 90mm, and/or the depth (thickness) of the at least one suction channel outside the at least one cross-sectional constriction can be between approximately 60mm and 140 mm. It has been shown that with a depth of this order of magnitude and/or with a corresponding size ratio of the depth of the at least one suction channel, an improvement of sucking out particles from the interior space of the wind distribution chamber and an improvement of avoiding attachment of particles at the rear wall can be achieved.

In a further advantageous embodiment, the depth of the at least one suction channel in the region of the at least one cross-sectional constriction and/or the depth outside the at least one cross-sectional constriction is adjustable. In this way, the flow velocity in the region of the at least one cross-sectional constriction and in the at least one suction channel outside the at least one cross-sectional constriction can be set. The depth of the at least one suction channel can thus be adapted in particular to the operating conditions in the wind distribution chamber.

According to the invention, the object is achieved for a rear wall having at least one outer rear wall section and at least one inner rear wall section, between which at least one suction channel is realized for drawing air and particles out of (sucking away) the interior space of the wind dispersal chamber, wherein the at least one rear wall section is directly or indirectly connected to at least one vibrator, so that the vibration energy generated by means of the at least one vibrator is transmitted to the at least one rear wall section.

According to the invention, the at least one rear wall section is set into vibration, whereby particles possibly attached to the at least one rear wall section can be shaken off in advance. In this way it can be avoided that particles may accumulate at the at least one rear wall portion and may coalesce into larger particle agglomerates.

In an advantageous embodiment, the at least one vibrator can be fastened at the at least one rear wall section and acts directly in a vibration-transmitting manner at the at least one rear wall section, and/or the at least one vibrator can be fastened separately from the at least one rear wall section and acts indirectly via the at least one vibration-transmitting connection at the at least one rear wall section. In case the at least one vibrator is arranged directly at the at least one rear wall portion, no further, in particular mechanical, connection is required. In the case of an indirect connection, the at least one vibrator may be arranged away from the at least one rear wall. The at least one vibrator can act indirectly on the at least one rear wall portion by means of a connection, in particular a mechanical connection, which transmits vibrations.

In a further advantageous embodiment, the at least one vibrator can be arranged at an outer rear wall section, which can be connected in a vibration-transmitting manner to the at least one inner rear wall section by means of at least one mechanical connection. In this way, the at least one vibrator may be indirectly connected with the at least one inner rear wall portion. The vibration-transmitting mechanical connection can advantageously be realized as a spacer (spacer) between the at least one outer rear wall section and the at least one inner rear wall section.

In a further advantageous embodiment, the at least one vibrator can be operated pneumatically and/or electrically and/or magnetically. The pneumatic vibrator has the advantage that it can be operated by means of a pneumatic system which is always present at the spreader. An electrically and/or magnetically operated vibrator has the advantage that it can be controlled directly by means of an electrical control device, in particular a spreader.

Advantageously, the at least one vibrator may be operated purely pneumatically, purely electrically or purely magnetically. Alternatively, the at least one vibrator may be operated by a combination of pneumatic, electrical and/or magnetic actuation.

Advantageously, the at least one vibrator can be designed as a vibrator (R ü ttler) with which it can correspondingly be rocked at the at least one rear wall section.

In a further advantageous embodiment, the oscillation frequency of the at least one oscillator is adjustable. In this way, the vibration frequency can be adapted to the existing operating conditions and/or to the configuration of the spreader in order to improve the efficiency in shaking off the particles from the at least one rear wall portion.

Advantageously, the at least one rear wall section can be connected to a plurality of vibrators acting directly or indirectly, in vibration-transmitting manner, at the assigned (distributed) locations of the at least one rear wall section. In this way, the at least one rear wall section can vibrate over a larger area.

Particles, in particular dust particles, debris or the like of the clothing, can be drawn off (sucked off) together with the air from the wind distribution chamber by means of the at least one suction channel. Advantageously, a slight underpressure can be present in the wind distribution chamber, in order to also avoid dust emissions laterally out of the wind distribution chamber. The air which is initially blown into the wind distribution chamber must be sucked in at the end of the wind distribution chamber at the rear wall in order to be able to specifically adjust the air flow direction parallel to the production direction. In this way, the dispersion can be separated, in particular sieved, along the wind dispersion chamber. The dispersion contains the gummed, very small particles, in particular chips and dust-like particles. The particles will remain attached (adhered) at the back wall due to the residual moisture and cold tack of the glue. When dust and particles attach at the back wall, other particles and dust may just accumulate to the attachment during production. These formed particle agglomerates can grow over time such that they eventually fall from the rear wall onto the forming belt, in particular due to gravity. Particle agglomeration can lead to disturbances on the spreading mat and the subsequent material sheet. Such disturbances may be visible in particular in the form of spots or stains on the surface of the finished material sheet.

Advantageously, the rear wall, in particular the at least one inner rear wall portion, may be made of steel plate. In this way, the rear wall can be stably realized. Alternatively, the rear wall, in particular the at least one outer rear wall portion, may be made of wood or another material.

Advantageously, so-called wind sifting can be carried out in the wind dispersal chamber. When the wind sifts out, an air flow is generated in the wind distribution chamber, which can be oriented predominantly parallel to the forming belt. By means of this air flow, small and fine particles of the dispersion can be carried further away and, for example, first, arrive on the forming belt, depending on the arrangement of the dispersion device, with respect to the direction of production, in order to form a covering layer of fine particles. The air flow may not have a major influence on the larger and heavier dispersion, and the larger and heavier dispersion thus already reaches the blanket formed by the cover layer particles and thus constitutes a coarser part of the cover layer or intermediate layer, as long as the conveying direction of the forming belt, i.e. the production direction, is oriented opposite to the air flow. If the production direction extends in the direction of the air flow, the larger and heavier spread falls first onto the forming belt and is then covered with finer spread particles.

The material sheet may be a material sheet produced from wood and/or other recycled agricultural products, such as particle board, fiber board, straw board and particle board, and plastic board.

The press may for example advantageously be a so-called continuously operating press. But other types of presses may be provided.

The rear wall has at least one inner rear wall portion and at least one outer rear wall portion. At least one outer rear wall portion separates the wind distribution chamber and the at least one suction channel outwardly from the environment. At least one internal rear wall portion separates an interior space of the wind spreading chamber through which air and entrained particles of the spread flow from the at least one suction channel.

Advantageously, the at least one rear wall portion is spatially arranged substantially vertically. Thus, the at least one rear wall portion may form a boundary of the wind dispersal chamber and/or the at least one suction channel with respect to its width.

Advantageously, the at least one rear wall portion may be displaceable at least in sections and/or transversely and/or along the flow direction in the interior space of the wind dispersal chamber and/or transversely to the production direction. In this way, the at least one suction channel and/or the at least one suction opening of the at least one suction channel can be adjusted.

Advantageously, the at least one suction channel may have at least one suction opening into the interior space of the wind distribution chamber. Air and particles can be drawn out of the interior space through the at least one suction opening and into the at least one suction channel.

Advantageously, the at least one suction opening may extend over the entire width of the interior space of the wind dispersal chamber. In this way, a uniform suction from the inner space can be performed.

Advantageously, the amount of suction is adjustable over the width of the wind dispersal chamber. In this way, increased flow velocities can be generated at the edges of the dispersion, which in total improve the quality of the dispersion mat.

In addition, this object is achieved for a dispenser according to the invention in that the rear wall is constructed according to one of the above-described advantageous embodiments.

The production of the spread mat is particularly associated with a method. The method is characterized in that at least one rear wall section of the rear wall is set in vibration directly or indirectly by means of at least one vibrator.

Alternatively or additionally, the method is characterized in that particles and particle agglomerates falling from the inside of the at least one inner rear wall section of the rear wall are captured by means of the at least one projection and are sucked into the suction channel through the at least one suction opening beside the at least one projection.

Further alternatively or additionally, the method is characterized in that air particles are sucked from the interior space of the wind distribution chamber into the suction channel through the suction opening, and the air and the particles are accelerated in at least one local cross-sectional constriction of the suction channel.

Furthermore, the features and advantages shown in connection with the rear wall according to the invention, the spreader according to the invention and the method according to the invention and its corresponding advantageous embodiments apply mutatis mutandis and vice versa. Of course, the individual features and advantages can be combined with one another, whereby further advantageous effects can be achieved which exceed the sum of the individual effects.

Drawings

Further advantages, features and details of the invention are given by the following description, in which embodiments of the invention are further explained with reference to the drawings. The features disclosed in connection with the figures, the description and the claims are suitable for a person skilled in the art to be considered individually and can be summarized meaningfully in other combinations. The figures show schematically:

fig. 1 shows a spreader with an air distribution chamber for producing a mat of spread material on a forming belt during the production of a material panel, wherein a rear wall of the air distribution chamber has an inner rear wall portion and an outer rear wall portion;

fig. 2 is a detailed view of the rear wall of the spreader shown in fig. 1.

Like components are denoted by like reference numerals in the drawings.

Detailed Description

A schematic configuration of a spreader 10 for spreading a mat 12 onto a forming belt 14 during the production of a material board is shown in fig. 1. The spreader 10 is shown in fig. 1 in its normal operating position. The upper run of the forming belt 14 travels in a production direction 16. The spreader 10 is located in the production direction 16 before a press, not shown, by means of which the spread mat 12 is pressed and hardened into a material sheet. The press may for example be a known continuously operating press.

The spreader 10 includes a wind spreading chamber 18 that is spatially located above the forming belt 14. The air dispersion chamber 18 has a dispersion inlet 20. The dispersion additions 20 are arranged in the covering wall 36 of the wind dispersion chamber 18 on the front side, seen in the production direction 16. Above the spreading agent introduction part 20, a spreading agent bunker, not shown in fig. 1, is arranged in which the spreading agent to be spread is held.

A rotating roller 22, which is not of further interest here, is located below the spread addition 20.

A blower 24 is arranged on the side of the wind scattering chamber 18 on which the scattering material addition part 20 is located. For example, the blower 24 is located on the front side of the spreader 10 as seen in the production direction 16. In an embodiment not shown here, in which the spreader 10 is arranged over the forming belt 14 in a mirror-image configuration with respect to the production direction 16, the blower 24 is located on the rear side of the wind distribution chamber, while the rear wall 38 is located on the front side of the wind distribution chamber 18.

By means of the blower 24, an air flow 26 is blown into the wind distribution chamber 18, for example substantially parallel to the production direction 16. The air flow 26 is directed opposite here at the outlet of the blower 24, thus at the beginning of the wind distribution chamber 18, parallel to the production direction 16 or slightly inclined to the production direction 16, in the case of the embodiment shown the production direction 16. The added scatter 28 is transported away from the scatter addition 20 by means of the air flow 26. Where the scatter material 28 is sieved and distributed into heavier and lighter scatter material particles. Lighter and therefore generally also smaller particles of the clothing are guided further through the air dispersion chamber 18 by the air flow 26 and, in the embodiment shown, land as a first (partial) on the forming belt 14.

In the wind scattering chamber 18, for example, three fly sieves 30 are arranged below the scattering material addition 20 and before the blower 24. The fly screen 30 is traversed by the air stream 26 and the entrained particulate material, depending on its mesh size. The particulate dispersion is sized according to its size.

Below the two first fly screens 30, a lower screen 32 is mounted, by means of which lower screen 32 the larger scatter particles falling downwards are transported according to their size against the air flow 26 and spread onto the forming belt 14.

The wind distribution chamber 18 is generally of a rectangular parallelepiped (rectangular parallelepiped) configuration. The wind dispersal chamber 18 is bounded by two walls 24, a cover wall 36 and a rear wall 38. The underside of the wind dispersal chamber 18 is bounded by the forming belt 14. On the front side, the wind distribution chamber 18 is provided with openings for a blower 24.

The outer wall 34 and the covering wall 36 extend, for example, substantially parallel to the production direction 16, thus to the forming belt 14, and to the direction of the air flow 26. The outer wall 34 extends substantially vertically over this space. The covering wall 36 extends substantially horizontally in space.

The rear wall 38 is located at the end of the wind dispersion chamber 18, opposite the blower 24, viewed in the direction of the air flow 26. The rear wall 38 extends, for example, substantially perpendicularly to the air flow 26 and to the production direction 16, spatially perpendicularly.

A detailed view of the rear wall 38 is shown in fig. 2. The rear wall 38 has an outer rear wall portion 40 and an inner rear wall portion 42. The inner rear wall portion 42 is located on a side of the inner space 44 facing the wind dispersion chamber 18. The outer rear wall portion 40 forms a boundary of the wind spreading chamber 18 with respect to the surroundings.

Between the outer rear wall portion 40 and the inner rear wall portion 42, a suction channel 46 is realized for sucking air and particles, such as dust particles, out of the interior space 44. The suction channel 46 extends, for example, over the entire horizontal width of the interior space 44. The suction channel 46 can also be divided into a plurality of sections across the width of the interior space 44 or be composed of a combination of a plurality of suction channel sections.

The suction channel 46 has a spatially upper suction opening 48 and a spatially lower suction opening 50 which open into the interior 44. An upper suction opening 48 is realized in the inner rear wall section 42. A suction opening 50 located at the lower part is realized below or beside the inner rear wall portion 42.

The suction opening 50 located at the lower part is spatially limited at the top by the spatially lower edge of the inner rear wall section 42. Spatially below, the suction opening 50 located below is limited by a spatially below section 52 of the outer rear wall section 40, which is bent, for example, by 90 ° relative to the inner space 44. The lower section 52 forms a lower limit 54 of the suction channel 46. Furthermore, the lower section 52 constitutes a projection 56. The projection 56 projects on the side facing the interior space 44 beyond the spatially upper interior side 58 of the interior rear wall section 42. The projections 56 are arranged steplessly (continuously) and without gaps in the extension of the lower limit 54.

The projection 56 projects beyond the inner side 58 of the inner rear wall section 42 by an excess amount 60, which is adjustable between 5mm and 50 mm. The vertical height 62 of the suction opening 50 located below can be adjusted, for example, between 20mm and 110 mm. The vertical height 64 of the suction opening 48 located above can be adjusted, for example, between 0mm and 30 mm. The upper edge of the suction opening 48 located above is arranged at a distance 66 of 100 to 200mm from the upper edge of the rear wall 38.

The one or more discharge openings 68 are located in the outer rear wall section 40 approximately at the height of the suction opening 48 located above, over the entire horizontal width. The discharge opening 68 is connected outside the interior space 44 to a suction device 70. The vertical height 72 of the discharge opening 68 amounts, for example, to 300mm to 600 mm. The upper edge of the discharge opening 68 is a distance 74 from the upper edge of the rear wall 38.

At the outer side of the outer rear wall portion 40 facing away from the inner space 44, a vibrator 76 is fastened below the discharge opening 68. Vibrations can be generated by means of the vibrator 76. The vibrations are transmitted to the inner rear wall portion 42 by means of the spacer 78. The spacer shims 78 extend from the outer rear wall portion 40 through the suction channel 46 to the inner rear wall portion 42. The spacer 78 serves as a mechanical connection for transmitting vibrations.

The vibrator 76 may be operated, for example, electrically, pneumatically, and/or magnetically. By means of the vibrator 76, the inner rear wall portion 42 can be excited to vibrate indirectly through the spacer 78. In this way it is avoided that particles may attach at the inner rear wall portion 42 and may coalesce into larger particle agglomerates. Such particle agglomerates may fall down and interfere with the structure of the spread pad 12 and the structure of the subsequent sheet of material.

The frequency of vibration of the vibrator 76 is adjustable. In this way, the vibration transmitted to the inner rear wall section 42 can be adjusted, for example, according to the operating conditions of the spreader 10, so that a correspondingly greater efficiency with regard to the shaking off of the particles is achieved.

The suction channel 46 has a cross-sectional constriction 80 downstream and thus spatially above the suction opening 50 below. The cross-sectional constriction 80 is located spatially above the lower limit 54 and the projection 56. The cross-sectional constriction 80 is realized by a curvature (bend) 82 of the inner rear wall portion 42, which rises towards the outer rear wall portion 40. The suction channel 46 thus converges from the side facing the interior space 44 of the wind dispersal chamber 18. The cross-sectional constriction 80 extends over the entire horizontal width of the suction channel 46. The thickness (depth) 84 of the suction channel 46 in the region of the cross-sectional constriction 80 can be adjusted, for example, between approximately 50mm and 90 mm. The thickness (depth) 86 of the suction channel 46 outside the cross-sectional constriction 80 can be adjusted, for example, between approximately 60mm and 140 mm. The thicknesses 84 and 86 extend horizontally in the direction of the air flow 26.

During operation of the wind distribution chamber 18, air and particles are sucked at the end of the wind distribution chamber 18 by means of the suction device 70 through the suction opening 48 located above, the suction opening 50 located below, the suction channel 46 and through the discharge opening 68. In order to achieve an efficient suction of particles and air without affecting the air flow in the interior space 44, the height 68 of the suction opening 48 located above, the height 62 of the suction opening 50 located below, the thickness (depth) 86 of the suction channel 46 outside the cross-sectional constriction 80 and the thickness (depth) 84 of the suction channel 46 inside the cross-sectional constriction 80 are correspondingly adjusted. Depending on the operating conditions of the spreader 10, the suction opening 48 located above may also be completely closed. Height 64, height 62, excess 60, thickness (depth) 84, and thickness (depth) 86 may be adjusted independently of each other to achieve better adjustment of flow characteristics.

The inner rear wall section 42 is set in vibration by means of the vibrator 76, so that the particles and dust parts occurring approximately at the inner side 58 do not remain attached there. The particle agglomerates that may remain there can be shaken off by the vibration at an earlier time and fall spatially down onto the projections 56.

The excess 60 of the projection 56 is adjusted such that possible particle agglomerations can be reliably captured and, furthermore, the air speed in the region of the end of the projection 56 is sufficiently high to suck the suspended particle agglomerations into the suction channel 46. By means of the cross-sectional constriction 58: a locally greater flow speed is achieved there immediately downstream of the projection 56 and the suction opening 50 located below. This can avoid: the particles are deposited in this region at the limit 54 of the suction channel 46.

List of reference numerals:

10 spreader

12 spreading material pad

14 forming belt

16 production direction

18 wind spreading chamber

20 spreading material adding part

22 roller

24 blower

26 air flow

28 spreading material

30 fly sieve

32 sifter

34 wall (outer)

36 covering wall

38 rear wall

40 rear wall part (exterior)

42 rear wall part (inner)

44 inner space

46 suction channel

48 suction opening (located above)

50 suction opening (below)

Section 52

54 boundary

56 projection

58 inner side

60 overrun

6250 height

6448 height

66 distance

68 discharge opening

70 suction device

7268 height

7468 distance

76 vibrator

78 spacer

80 cross-sectional constriction

82 bend (part)

84 depth of suction channel in the region of 80

86 the depth of the aspiration channel.

Claims (21)

1. A rear wall for a wind distribution chamber of a distributor, wherein the distributor (10) is intended for forming a distribution mat (12) on a forming belt (14) during production of material boards in a press located behind in a production direction (16), characterized in that the rear wall (38) has at least one outer rear wall section (40) and at least one inner rear wall section (42), between which at least one suction channel (46) is realized for drawing air and particles out of an inner space (44) of the wind distribution chamber (18), wherein the at least one suction channel (46) has at least one suction opening (50) opening into the inner space (44) of the wind distribution chamber (18), which is located in or beside the at least one inner rear wall section (42), and at least one projection (56) is arranged in a normal operating position of the distributor (10) The at least one suction opening (50) protrudes towards the interior of the wind distribution chamber (18) beyond the spatially upper inner side (58) of the at least one inner rear wall section (42) at the level of the spatially lower edge.

2. The rear wall according to claim 1, characterized in that the at least one projection (56) is arranged in the extension of the spatially lower border (54) of the at least one suction channel (46).

3. The rear wall according to claim 1 or 2, characterized in that the spatially lower boundary (54) of the at least one suction channel (46) and/or the at least one projection (56) are at least jointly formed by the corresponding at least one outer rear wall portion (40).

4. The rear wall according to claim 1 or 2, characterized in that a spatially lower section (52) of the at least one outer rear wall portion (40) is curved towards the inner space (44) of the wind distribution chamber (18) and forms at least a spatially lower boundary (54) of the at least one suction channel (46) and the at least one projection (56) together.

5. The backwall according to claim 1 or 2, characterized in that the at least one projection (56) projects beyond the inner side (58) of the at least one inner backwall portion (42) by an excess (60) of between about 5mm and 50 mm.

6. Rear wall according to claim 1 or 2, characterized in that the height (62) of the at least one suction opening (50) viewed in the direction of the spatially vertical direction amounts to between approximately 20mm and 110 mm.

7. Rear wall according to claim 1 or 2, characterized in that the excess (60) of the at least one projection (56) relative to the inner side (58) of the at least one inner rear wall section (42) is adjustable and/or the height (62) of the at least one suction opening (50) in the spatially vertical direction is adjustable.

8. A rear wall for an air distribution chamber of a distributor, wherein the distributor (10) is intended for forming a distribution mat (12) on a forming belt (14) during the production of material boards in a press located behind in a production direction (16), characterized in that the rear wall (38) has at least one outer rear wall section (40) and at least one inner rear wall section (42), between which at least one suction channel (46) is realized for drawing air and particles out of an inner space (44) of the air distribution chamber (18), wherein the at least one suction channel (46) has at least one suction opening (50) opening into the inner space (44) of the air distribution chamber (18), the at least one suction opening is located in or beside the at least one inner rear wall section (42), and the at least one suction channel (46) has at least one suction opening (50) downstream of the at least one suction opening (50) A cross-sectional constriction (80).

9. The rear wall according to claim 8, characterized in that the at least one suction channel (46) converges from a side of the inner space (44) facing the wind dispersion chamber (18).

10. The rear wall according to claim 8 or 9, characterized in that the at least one cross-sectional constriction (80) is arranged directly above the space of the at least one suction opening (50) with respect to the normal operating position of the wind distribution chamber (18).

11. The rear wall according to claim 8 or 9, characterized in that the at least one suction opening (50) and the at least one cross-sectional constriction (80) are arranged spatially above the lower boundary (54) on the space of the at least one suction channel (46) with respect to the normal operating position of the wind distribution chamber (18).

12. The rear wall according to claim 8 or 9, characterized in that the at least one cross-sectional constriction (80) extends over the width of the at least one suction channel (46).

13. Rear wall (38) according to claim 8 or 9, characterized in that the at least one cross-sectional constriction (80) is realized by a corresponding curvature (82) of at least one corresponding inner rear wall portion (42) and/or by a corresponding curvature (82) of at least one corresponding outer rear wall portion (40).

14. The rear wall according to claim 8 or 9, characterized in that the depth (84) of the at least one suction channel (46) in the at least one cross-sectional constriction (80) amounts to between approximately 50mm and 90mm, and/or the depth (86) of the at least one suction channel (46) outside the at least one cross-sectional constriction (80) amounts to between approximately 60mm and 140 mm.

15. The rear wall as claimed in claim 8 or 9, characterized in that the depth of the at least one suction channel (46) in the region of the at least one cross-sectional constriction (80) and/or beyond the at least one cross-sectional constriction (80) is adjustable.

16. A rear wall (38) for an air distribution chamber (18) of a distributor (10), wherein the distributor (10) is intended for forming a distribution mat (12) on a forming belt (14) during the production of material panels in a press located behind in a production direction (16), characterized in that the rear wall (38) has at least one outer rear wall section (40) and at least one inner rear wall section (42) between which at least one suction channel (46) is realized for drawing air and particles out of an inner space (44) of the air distribution chamber (18), wherein at least one rear wall section is directly or indirectly connected with at least one vibrator (76) such that vibrational energy generated by means of the at least one vibrator (76) is transmitted to the at least one rear wall section.

17. Rear wall according to claim 16, characterized in that the at least one vibrator (76) is fastened at the at least one rear wall part and acts directly in vibration transmission at the at least one rear wall part, and/or that the at least one vibrator (76) is fastened separately from the at least one rear wall part and acts indirectly at the at least one rear wall part by means of at least one connection (78) transmitting vibrations.

18. The rear wall according to claim 16 or 17, characterized in that the at least one vibrator (76) is arranged at the outer rear wall portion (40) which is connected in a vibration-transmitting manner to the at least one inner rear wall portion (42) by means of at least one mechanical connection (78).

19. Rear wall according to claim 16 or 17, characterized in that the at least one vibrator (76) is operated pneumatically and/or electrically and/or magnetically.

20. Rear wall according to claim 16 or 17, characterized in that the vibration frequency of the at least one vibrator (76) is adjustable.

21. A spreader (10) for forming a spread mat (12) on a forming belt (14) during production of material boards in a press located after in a production direction (16), the spreader having at least one air spreading chamber (18) at the ends of which a rear wall (38) is arranged, characterized in that the rear wall (38) is constructed according to any one of claims 1 to 20.

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