DE102019110782A1 - Spreader and rear wall for a windscreen chamber of a spreader - Google Patents

Abstract

The invention relates to a rear wall (38) for a wind raking chamber (18) of a spreading machine (10), wherein the spreading machine (10) serves to form a spreading material mat (12) on a forming belt (14) in the course of producing material plates in a subsequent press , In this case, the rear wall (38) at least one outer rear wall part (40) and at least one inner rear wall part (42) between which at least one suction duct (46) for sucking air and particles from the interior (44) of the windbreak chamber (18) is realized , In a first embodiment, the at least one suction channel (46) at least one suction opening (50) to the interior (44) of the windbreak chamber (18), which is located in or next to at least one inner rear wall portion (42) and at the level of a normal Operating position of the spreader (10) spatially lower edge of at least one suction opening (50) at least one projection (56) is arranged, a spatially overlying inside (58) of the at least one inner rear wall part (42) to the interior of the windbreak chamber (18) surmounted. In a second embodiment, the at least one suction channel (46) has at least one cross-sectional constriction (80) downstream of at least one suction opening (50). And in a third embodiment, at least one of the rear wall portions (42) for transmitting vibrations is operatively connected directly or indirectly to at least one vibrator (76).

Description

The invention relates to a rear wall for a wind raking chamber of a spreader, wherein the spreader serves to form a spit mat on a forming belt in the course of the production of material plates in a subsequent press in the production direction.

Furthermore, the invention relates to a spreader for forming a grit mat on a forming belt in the course of the production of material plates in a downstream in the direction of production press, with at least one Windstreukammer, at the end of a rear wall is arranged.

A known from the market scattering machine for forming a grit mat on a forming belt in the course of the production of material plates in a downstream in the direction of production press has a Windstreukammer on. At the Windstreukammer a rear wall is arranged, which limits the interior of the Windstreukammer at the end. It has been found that during operation of the scattering machine in the windbreak chamber with a stream of air conveyed grit can fly against the rear wall and adhere to it. The grit can collect there and unite to form lumps. These lumps may fall from the back wall onto the forming belt. The lumps may consist of glued chips or fibers and dust, in particular wood dust. Such lumps on the finished material plate can lead to unwanted disturbances, in particular stains or shadows on the surface.

The invention has for its object to design a rear wall and a spreader of the type mentioned, in which the risk of contamination of the grit mats with lumps of material falling from the rear wall of the windstrike chamber can be reduced. Preferably, the formation of lumps on the back wall can be prevented.

Alternatively or additionally, the object in the rear wall can be achieved in that the rear wall has at least one outer rear wall part and at least one inner rear wall part, between which at least one suction duct for sucking air and particles from the interior of the windbreak chamber is realized, wherein the at least one Suction duct has at least one suction opening to an interior of the windbreak chamber, which is located in or next to at least one inner rear wall part, and at the level of a normal operating position of the spreader spatially lower edge of the at least one suction opening at least one projection is arranged, which is a spatially overlying inside the at least one inner rear wall part projects beyond the interior of the windbreak chamber.

According to the invention, therefore, at least one projection is provided, which is located below the at least one suction opening. With the at least one projection can be collected down falling particle lumps and sucked through the at least one suction opening. In this way it can be prevented that the particle lumps falling from the inside of the at least one inner rear wall part can fall onto the forming belt or the spreading material mat.

In an advantageous embodiment, the at least one projection may be arranged in extension of a spatially lower boundary of the at least one suction channel. In this way, a transition between the at least one projection and the lower spatial boundary can be realized steplessly. Thus, on the at least one projection landing particle lumps can be better sucked into the at least one suction and through this.

In a further advantageous embodiment, a spatially lower boundary of the at least one suction channel and the at least one projection of the corresponding at least one outer rear wall part at least be mitgebildet. In this way, a seamless and stepless surface course can be realized from the at least one projection over the spatially lower boundary to the at least one suction channel.

In a further advantageous embodiment, a spatially lower portion of at least one outer rear wall portion may be bent toward the interior of the windstrike chamber and at least form a spatially lower boundary of at least one suction channel and the at least one projection. In this way, a production can be simplified.

Advantageously, the bending of the at least one outer rear wall part can be realized steplessly. In this way, it can be free of corners and edges on which particles, in particular particle lumps, could adhere.

In a further advantageous embodiment, a projection, with which the at least one projection projects beyond the inside of the at least one inner rear wall part, can be between approximately 5 mm and 50 mm. On the one hand, the supernatant can be set sufficiently large so that even large particles of lumps falling down are reliably caught by the projection. on the other hand the supernatant can be set sufficiently small, so that a speed of the sucking air at the outer end of the projection is large enough to suck there particle lumps in the at least one suction can.

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

In a further advantageous embodiment, a projection of the at least one projection relative to the inside of the at least one inner rear wall part can be adjustable and / or a height of the at least one suction opening can be adjustable in the direction of the spatial vertical. By appropriate adjustment of the suction opening, an air flow can be influenced accordingly, so that even larger and heavier particle lumps can be sucked off. The total extracted air volume from the windbreak chamber may not be too large, so that the flow velocity in the interior of the windbreak chamber is not too large. Excessive flow velocities in the windstrike chamber can adversely affect air classification.

For certain material plates, in particular chipboard, a strong separation and for other types a smaller separation of the grit particles, in particular wood chips, may be desired in size. This different separation can be adjusted by different strong air currents in the windbreak chamber. Therefore, it is advantageous to set the height of the at least one suction opening variable depending on the total amount of suction. In this way it can be achieved that there is always a sufficiently large flow velocity at the at least one suction opening in order to suck off particle lumps and to avoid corresponding adhesion of particles to the at least one rear wall part.

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

Alternatively or additionally, the object in the rear wall can be achieved in that the rear wall has at least one outer rear wall part and at least one inner rear wall part, between which at least one suction duct for sucking air and particles from the interior of the windbreak chamber is realized, wherein the at least one Suction duct has at least one suction opening to the interior of the windbreaker chamber, which is located in or next to at least one inner rear wall part, and at least one suction duct downstream of at least one suction opening has at least one cross-sectional constriction.

According to the invention, the at least one suction channel has at least one cross-sectional constriction with respect to the extracted air flow behind the at least one suction opening. In the area of the cross-sectional constriction, an increase in the flow velocity is achieved. Directly behind the at least one suction opening, the at least one suction channel forms a critical area in which there is an increased risk that particles may adhere there and unite into particle lumps. Due to the at least one cross-sectional constriction, a locally greater flow velocity can be achieved in this critical region, whereby the adhesion of particles is counteracted.

In an advantageous embodiment, the at least one suction channel may be narrowed by the side facing the interior of the windbreak chamber. In this way, the opposite region of the at least one suction channel, which forms the radially outer side with respect to the course, can be flowed through freely. Thus, on the whole, the flow in the at least one suction channel can be improved to avoid particle adhesion.

In a further advantageous embodiment, at least one cross-sectional narrowing can be arranged directly spatially above the at least one suction opening with respect to the normal operating position of the windbreak chamber. In this way, directly behind the at least one suction opening a locally higher flow velocity can be achieved.

In a further advantageous embodiment, the at least one suction opening and at least one cross-sectional constriction with respect to the normal operating position of the windbreak chamber may be arranged spatially above a spatially lower boundary of the at least one suction channel. In this way, the particles sucked out of the windscrew chamber can be conducted directly along the spatially lower boundary into the suction channel, where they are efficiently sucked off due to the higher flow velocity in the area of the at least one cross-sectional constriction.

In a further advantageous embodiment, at least one cross-sectional constriction may 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. Thus, a more uniform extraction can take place and it can be avoided that the air flow in the interior of the windbreak chamber and thus the air classification is not adversely affected.

The width according to the invention is the dimension which extends in the normal operating position of the windbreak chamber spatially horizontally across the air flow in the interior and / or transversely to a production direction. The depth extends correspondingly horizontally parallel to the air flow.

In a further advantageous embodiment, at least one cross-sectional constriction can be realized by a corresponding bending of at least one corresponding inner rear wall part and / or by a corresponding bending of at least one corresponding outer rear wall part. In this way, the cross-sectional constriction can be realized more easily. Furthermore, so no further construction measures, in particular the attachment of protruding elements required.

In a further advantageous embodiment, a depth of the at least one suction channel in the region of at least one cross-sectional constriction may be approximately between 50 mm and 90 mm and / or a depth of the at least one suction channel outside the at least one cross-sectional constriction may be approximately between 60 mm and 140 mm. It has been found that at depths of this order of magnitude and / or with corresponding size ratios of the depths of the at least one suction channel, an improvement in the extraction of particles from the interior of the windbreak chamber and an improvement in the prevention of the adhesion of particles to the back wall can be achieved.

In a further advantageous embodiment, a depth of the at least one suction channel may be adjustable in the region of at least one cross-sectional constriction and / or outside the at least one cross-sectional constriction. In this way, the flow velocity in the at least one suction channel can be adjusted both in the region of the at least one cross-sectional constriction and outside the at least one cross-sectional constriction. Thus, the depths of the at least one suction duct can be adapted in particular to the operating conditions in the windscrew chamber. This object can be achieved according to the invention in that the rear wall has at least one outer rear wall part and at least one inner rear wall part, between which at least one suction duct for sucking off Air and particles from the interior of the Windstreukammer is realized, wherein at least one of the rear wall parts is directly or indirectly connected to at least one vibrator so that the vibrations generated by the at least one vibrator can be transmitted to the at least one rear wall part.

According to the invention, the at least one rear wall part is set in vibration, whereby particles adhering to the at least one rear wall part can be shaken off at an early stage. In this way it can be prevented that particles can collect on the at least one rear wall part and combine to form larger particle lumps.

In an advantageous embodiment, at least one vibrator can be fastened to at least one rear wall part and attack vibration-transmitting directly on this and / or at least one vibrator can be fastened separately from the at least one rear wall part and indirectly act on the at least one rear wall part by means of at least one vibration-transmitting connection. In a direct arrangement of the at least one vibrator on the at least one rear wall part no further, in particular mechanical connection is required. In an indirect connection, the at least one vibrator can be arranged away from the at least one rear wall part. The at least one vibrator can indirectly act on the at least one rear wall part by means of a vibration-transmitting connection, in particular a mechanical connection.

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

In a further advantageous embodiment, at least one vibrator can be operated pneumatically and / or electrically and / or magnetically. Pneumatic vibrators have the advantage that they are present with the spreader anyway pneumatic systems can be operated. Electrically and / or magnetically operated vibrators have the advantage that they can be controlled directly by means of an electrical control device, in particular the spreader.

Advantageously, at least one vibrator can be operated purely pneumatically, purely electrically or purely magnetically. Alternatively, at least one vibrator can be operated by means of a combination of pneumatic, electric and / or magnetic drive.

Advantageously, at least one vibrator can be designed as a vibrator. With the vibrator can be shaken according to the at least one rear wall part accordingly.

In a further advantageous embodiment, a vibration frequency of at least one vibrator can be adjustable. In this way, the vibration frequency can be adapted to the prevailing operating conditions and / or the structure of the spreader to improve efficiency in shaking off particles from the at least one rear wall part.

Advantageously, the at least one rear wall part may be connected to a plurality of vibrators, which at distributed locations can attack the at least one rear wall part directly or indirectly in a vibration-transmitting manner. In this way, the at least one rear wall part can be brought into vibration over a larger area.

With the aid of the at least one suction channel, particles, in particular dust particles, shavings or the like of the spreading material, and air are sucked out of the windbreak chamber together. Advantageously, a slight negative pressure prevail in the windstrike chamber in order to avoid lateral dusting out of the windbreak chamber. The air blown into the windbreak chamber at the beginning must be sucked off at the rear wall at the end of the windbreak chamber in order to be able to set an airflow direction parallel to the production direction. In this way, the spreading material can be separated, in particular sighted, along the windbreaking chamber. The grit contains glued, very small particles, especially chips and dust-like particles. Due to the residual moisture and cold tack of the glue, the particles can adhere to the back wall. If there is an adhesion of dust and particles on the back wall, additional particles and dust can accumulate in the course of production due to these buildup. Over time, these forming lumps of particles can increase in size so that they finally fall, in particular due to gravity, from the rear wall onto the forming belt. The particle lumps can cause disturbances on the spreading material mat and the later material plate. Such disturbances may be visible in particular in the form of spots or shadows on the surface of the finished material plate.

Advantageously, the rear wall, in particular the at least one inner rear wall part, be made of sheet steel. In this way, the rear wall can be stably realized. Alternatively, the rear wall, in particular the at least one outer rear wall part, be made of wood or other material.

Advantageously, a so-called air sifting can take place in the windbreak chamber. In air classification, an air flow is generated in the windbreak chamber, which can be aligned substantially parallel to the forming belt. As a result of this air flow, small and fine grit particles are carried far away and, depending on the arrangement of the spreader, for example, first of all reach the forming belt with respect to the production direction in order to form a cover layer of fine particles. Larger and heavier spreading material can not be so strongly influenced by the air flow and thus already reaches a carpet from the cover layer particles and thus forms the coarser part of a cover layer or a middle layer, insofar as the conveying direction of the forming belt, ie the production direction, is directed opposite to the air flow , If the production direction runs in the direction of the air flow, the larger and heavier falls

Spread the material onto the forming belt first and then cover it with finer grit particles.

The material plates may be material plates made of wood and / or other renewable agricultural products such as chipboard, fiber, straw, and Schnitzelplatten, and plastic plates act.

The press may advantageously be a so-called continuously operating press. But it can also be provided a different type of press.

The rear wall has at least one inner rear wall part and at least one outer rear wall part. The at least one outer rear wall part separates the windstrike chamber and the at least one suction channel outwards to the environment. The at least one inner rear wall part separates the interior of the windbreak chamber, which is traversed by air and entrained grit particles, from the at least one suction channel.

Advantageously, at least one rear wall part can be arranged spatially approximately vertically. Thus, the at least one rear wall part may limit the windbreak chamber and / or the at least one suction channel with respect to their width.

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

Advantageously, at least one suction channel can have at least one suction opening to the interior of the windbreak chamber. The at least one suction opening allows air and particles to be sucked out of the interior into the at least one suction channel.

Advantageously, at least one suction opening can extend over the entire width of the interior of the windbreak chamber. In this way, a more uniform extraction from the interior can be done.

Advantageously, a suction amount can be adjustable over the width of the windstrike chamber. In this way, an increased flow velocity can be effected at the edges of the grit mat, which overall can improve the quality of the grit mat.

Furthermore, the object in the scattering machine according to the invention can be achieved in that the rear wall is formed according to one of the above advantageous embodiments.

The production of a grit mat is in particular associated with a method. The method is characterized in that at least one rear wall part of the rear wall is set directly or indirectly in vibration with at least one vibrator.

Alternatively or additionally, the method is characterized in that from an inner side of at least one inner rear wall portion of the rear wall falling particles and particle lumps are collected with at least one projection and sucked through at least one suction opening next to the at least one projection in a suction.

Next alternatively or additionally, the method is characterized in that air and particles are sucked from an interior of the windbreaker chamber through a suction in a suction and the air and the particles are accelerated in at least one local cross-sectional constriction of the suction.

Incidentally, the features and advantages shown in connection with the rear wall according to the invention, the scattering machine according to the invention and the method according to the invention and their respective advantageous embodiments apply mutatis mutandis and vice versa. The individual features and advantages can, of course, be combined with one another, whereby further advantageous effects can be achieved that go beyond the sum of the individual effects.

• 1 eine Streumaschine zur Erzeugung einer Streugutmatte auf einem Formband im Zuge der Herstellung von Werkstoffplatten, mit einer Windstreukammer, wobei eine Rückwand der Windstreukammer einen inneren Rückwandteil und einen äußeren Rückwandteil aufweist;
• 2 eine Detailansicht der Rückwand der Streumaschine aus der 1.

Further advantages, features and details of the invention will become apparent from the following description, are explained in more detail in the embodiments of the invention with reference to the drawing. The person skilled in the art will expediently also individually consider the features disclosed in the drawing, the description and the claims in combination and combine these into meaningful further combinations. It show schematically

• 1 a spreader for producing a spreader mat on a forming belt in the course of the production of material plates, with a Windstreukammer, wherein a rear wall of the Windstreukammer having an inner rear wall portion and an outer rear wall portion;
• 2 a detail view of the rear wall of the spreader from the 1 ,

In the figures, the same components are provided with the same reference numerals.

In the 1 is the schematic structure of a spreader 10 for scattering a spreading material mat 12 on a form band 14 shown in the course of the production of material plates. The spreader 10 is in the 1 shown in their normal operating position. The upper run of the form band 14 runs in a production direction 16 , The spreader 10 is located in the direction of production 16 in front of a press, not shown, with the grit mat 12 pressed to material plates and cured. By way of example, the press can be a continuously operating press known per se.

The spreader 10 includes a windbreak chamber 18 , which are spatially above the form band 14 located. The windstrike chamber 18 indicates a grit entry 20 on. The grit entry 20 is in a ceiling wall 36 the windstrike chamber 18 on the in production direction 16 viewed front side. Above the grit entry 20 is one in the 1 Not shown Streugutbunker arranged in which the scattering material to be scattered is kept.

Below the grit entry 20 There is a rotating roller not of interest here 22 ,

On the side of the windstrike chamber 18 on which the grit entry 20 is a fan 24 arranged. By way of example, the blower is located 24 on the in production direction 16 considered front side of the spreader 10 , In an embodiment not shown here, in which the spreader 10 concerning the production direction 16 mirror image over the form band 14 is located, the blower is located 24 on the back and the back wall 38 on the front side of the windscreen chamber 18 ,

With the fan 24 becomes an airflow 26 for example, approximately parallel to the production direction 16 in the windbreak chamber 18 blown. The airflow 26 is at the outlet of the blower 24 so at the beginning of Windstreukammer 18 parallel or slightly inclined to the production direction 16 in the embodiment shown, the production direction 16 opposite direction. With the airflow 26 becomes the registered grit 28 from the grit entry 20 transported away. Here, a sighting and distribution of the grit takes place 28 in heavier and lighter grit particles. The light and thus generally smaller grit particles are caused by the air flow 26 continue through the windbreak chamber 18 led and land in the embodiment shown first on the forming belt 14 ,

In the windbreak chamber 18 are below the grit entry 20 and in front of the blower 24 For example, three flying screens 30 arranged. The flying sieves 30 depending on their mesh size, from the airflow 26 and flows through the entrained grit particles. The grit particles are thus classified on the basis of their size.

Below the first two flying screens 30 is a lower sieve 32 mounted, with which falling larger grit particles depending on their size against the air flow 26 transported and on the form band 14 be scattered.

The windstrike chamber 18 is a total of approximately cuboid. The windstrike chamber 18 is through two walls 34 , the ceiling wall 36 and a back wall 38 limited. The underside of the windscreen chamber 18 is through the form band 14 limited. On the front is the windstrike chamber 18 with an opening for the blower 24 Mistake.

The outer walls 34 and the ceiling wall 36 run for example approximately parallel to the production direction 16 , ie parallel to the forming belt 14 and to the direction of the airflow 26 , The outer walls 34 extend approximately spatially vertically. The ceiling wall 36 extends approximately spatially horizontally.

The back wall 38 is located at the end of the windbreak chamber 18 that in the direction of the airflow 26 looks at the fan 24 opposite. The back wall 38 extends for example approximately perpendicular to the air flow 26 and to the production direction 16 , spatially vertical.

In the 2 is a detail view of the back wall 38 shown. The back wall 38 has an outer back wall part 40 and an inner back wall part 42 on. The inner back wall part 42 is located on the one interior 44 the windstrike chamber 18 facing side. The outer back wall part 40 limits the windstrike chamber 18 towards the surroundings.

Between the outer rear wall part 40 and the inner back wall part 42 is a suction channel 46 for the extraction of air and particles, for example grit dust, from the interior 44 realized. The suction channel 46 extends exemplarily over the entire horizontal width of the interior 44 , The suction channel 46 can also be about the width of the interior 44 divided into several segments or composed of several Absaugkanalabschnitten.

The suction channel 46 has a spatially upper suction opening 48 and a spatially lower suction opening 50 to the interior 44 on. The upper suction opening 48 is in the inner back wall part 42 realized. The lower suction opening 50 is below or next to the inner back wall part 42 realized.

The lower suction opening 50 is spatially above through the lower spatial edge of the inner rear wall part 42 limited. Spatially below is the lower suction 50 through a spatially lower section 52 the outer rear wall part 40 limited, which to the interior 44 is bent by way of example by 90 °. The lower section 52 forms a lower limit 54 of the suction channel 46 , Furthermore, the lower section forms 52 a lead 56 , The lead 56 surmounted the inside above 58 of the inner rear wall part 42 on the interior 44 facing side. The lead 56 is stepless and gapless in extension of the lower limit 54 arranged.

The lead 56 surmounts the inside 58 of the inner rear wall part 42 a supernatant 60 , which is adjustable between 5 mm and 50 mm. A vertical height 62 the lower suction opening 50 is exemplary between 20 mm and 110 mm adjustable. A vertical height 64 the upper suction opening 48 is for example adjustable between 0 mm and 30 mm. The upper edge of the upper suction opening 48 is at a distance 66 from 100 to 200 mm from the top of the back wall 38 arranged.

At the level of the upper suction opening 48 are located in the outer rear wall part 40 one or more outlet openings over the entire horizontal width 68 , The outlet opening 68 is outside the interior 44 with a suction device 70 connected. A vertical height 72 the outlet opening 68 is exemplary between 300 and 600 mm. An upper edge of the outlet opening 68 is at a distance 74 from the top of the back wall 38 ,

At the interior 44 remote outside of the outer rear wall part 40 is below the outlet opening 68 a vibrator 76 attached. With the vibrator 76 vibrations can be generated. The vibrations are made by means of a spacer 78 on the inner back wall part 42 transfer. The spacer 78 extends from the outer rear wall part 40 through the suction channel 46 to the inner back wall part 42 , The spacer 78 acts as a vibration-transmitting mechanical connection.

The vibrator 76 can be operated by way of example electrically, pneumatically and / or magnetically. With the vibrator 76 can the inner back wall part 42 over the spacer 78 be excited indirectly to vibrations. In this way it can be prevented that particles on the inner rear wall part 42 attach and can unite to larger particles lumps. Such particle lumps could fall down and the structure of the litter mat 12 and disturb the later material plate.

The vibration frequency of the vibrator 76 is adjustable. In this way, the on the inner back wall part 42 transmitted vibrations, for example, depending on operating conditions of the spreader 10 be set to achieve a correspondingly high efficiency with respect to the shaking off of particles.

The suction channel 46 points downstream, so spatially above the lower suction 50 , a cross-sectional constriction 80 on. The cross-sectional constriction 80 is located above the lower limit 54 and the projection 56 , The cross-sectional constriction 80 gets through a bend 82 of the inner rear wall part 42 realized, which is to the outer rear wall part 40 rises. The suction channel 46 is so from the interior 44 the windstrike chamber 18 narrowed side facing. The cross-sectional constriction 80 extends over the entire horizontal width of the suction channel 46 , A depth 84 of the suction channel 46 in the area of the cross-sectional constriction 80 is exemplarily adjustable between about 50 mm and 90 mm. A depth 86 of the suction channel 46 outside the cross-sectional constriction 80 is for example adjustable between 60 mm and 140 mm. The deeps 84 and 86 extend horizontally in the direction of the airflow 26 ,

When operating the windbreak chamber 18 become air and particles at the end of the windbreak chamber 18 using the suction device 70 through the upper suction opening 48 , the lower suction opening 50 , the suction channel 46 and through the outlet opening 68 aspirated. To achieve efficient extraction of the particles and the air without affecting the air flow in the interior 44 is affected, the height 64 the upper suction opening 48 , the height 62 the lower suction opening 50 , the depth 86 of the suction channel 46 outside the cross-sectional constriction 80 and the depth 84 of the suction channel 46 within the cross-sectional constriction 80 adjusted accordingly. Depending on the operating conditions of the spreader 10 can the upper suction opening 48 be completely closed. The height 64 , the height 62 , the supernatant 60 , the depth 84 and the depth 86 can be adjusted independently of each other to achieve a better adjustment of the flow conditions.

The inner back wall part 42 is using the vibrator 76 vibrated, so on the inside 58 impinging particles and dust particles can not stick there. For example, particles of lumps forming there are shaken off early by the vibration and fall spatially down onto the projection 56 ,

The supernatant 60 of the lead 56 is adjusted so that any particle lumps can be safely collected and also an air velocity in the region of the end of the projection 56 is large enough to catch the trapped particles in the suction channel 46 to suck. Due to the cross-sectional constriction 80 is achieved that there immediately downstream of the projection 56 and the lower suction opening 50 a locally higher flow rate is achieved. This can prevent particles from being present at the boundaries in this area 54 of the suction channel 46 can settle.

LIST OF REFERENCE NUMBERS

10

spreader

12

grit mat

14

forming belt

16

production direction

18

Wind scattering chamber

20

grit entry

22

roller

24

fan

26

airflow

28

grit

30

flight screens

32

scree

34

Wall (outer)

36

ceiling wall

38

rear wall

40

Rear wall part (outer)

42

Rear wall part (inner)

44

inner space

46

suction

48

Suction opening (upper)

50

Suction opening (lower)

52

section

54

limit

56

head Start

58

inside

60

Got over

62

Height of 50

64

Height of 48

66

distance

68

outlet

70

suction

72

Height of 68

74

Distance from 68

76

vibrator

78

spacer

80

Cross-sectional narrowing

82

bend

84

Depth of the suction channel in the range of 80

86

Depth of the suction channel

Claims (21)

Rear wall (38) for a wind raking chamber (18) of a spreader (10), wherein the spreader (10) for forming a grit mat (12) on a forming belt (14) in the course of the production of material plates in a direction of production (16) subsequent press Serves, characterized in that the rear wall (38) at least one outer rear wall part (40) and at least one inner rear wall part (42), between which at least one suction channel (46) for sucking air and particles from the interior (44) of the windbreak chamber (18) is realized, wherein the at least one suction channel (46) at least one suction opening (50) to the interior (44) of the Windstreukammer (18) which is in or adjacent at least one inner rear wall portion (42), and at height a in the normal operating position of the spreader (10) spatially lower edge of the at least one suction opening (50) at least one projection (56) is arranged, which is a spatially above end inner side (58) of the at least one inner rear wall part (42) projects beyond the interior of the windbreak chamber (18). Rear wall (38) to Claim 1 , characterized in that the at least one projection (56) in extension of a lower spatial boundary (54) of the at least one suction channel (46) is arranged. Rear wall (38) to Claim 1 or 2 , characterized in that a spatially lower boundary (54) of the at least one suction channel (46) and / or the at least one projection (56) of the corresponding at least one outer rear wall part (40) is at least co-formed. Rear wall (38) according to one of the preceding claims, characterized in that a spatially lower portion (52) of at least one outer rear wall part (40) is bent towards the inner space (44) of the wind strike chamber (18) and at least one lower spatial limit (54) a suction channel (46) and the at least one projection (56) at least forms. Rear wall (38) according to one of the preceding claims, characterized in that a projection (60), with which the at least one projection (56) projects beyond the inside (58) of the at least one inner rear wall part (42), is between approximately 5 mm and 50 mm mm. Rear wall (38) according to one of the preceding claims, characterized in that a Height (62) of the at least one suction opening (50) viewed in the direction of the spatial vertical is approximately between 20 mm and 110 mm. Rear wall (38) according to one of the preceding claims, characterized in that a projection (60) of the at least one projection (56) is adjustable relative to the inside (58) of the at least one inner rear wall part (42) and / or a height (62). the at least one suction opening (50) is adjustable in the direction of the spatial vertical. Rear wall (38) for a wind raking chamber (18) of a spreader (10), wherein the spreader (10) for forming a grit mat (12) on a forming belt (14) in the course of the production of material plates in a direction of production (16) subsequent press Serves, characterized in that the rear wall (38) at least one outer rear wall part (40) and at least one inner rear wall part (42), between which at least one suction channel (46) for sucking air and particles from the interior (44) of the windbreak chamber (18) is realized, wherein the at least one suction channel (46) at least one suction opening (50) to the interior (44) of the Windstreukammer (18), which is located in or next to at least one inner rear wall portion (42), and at least one Suction channel (46) downstream of at least one suction opening (50) has at least one cross-sectional constriction (80). Rear wall (38) to Claim 8 Characterized in that the at least one suction channel (46) from the interior (44) of the wind scattering chamber facing (18) side is narrowed forth. Rear wall (38) to Claim 8 or 9 , characterized in that at least one cross-sectional constriction (80) with respect to the normal operating position of the wind-strike chamber (18) is arranged directly above the at least one suction opening (50). Rear wall (38) after one of Claims 8 to 10 , characterized in that the at least one suction opening (50) and at least one cross-sectional constriction (80) with respect to the normal operating position of Windstreukammer (18) spatially above a lower spatial boundary (54) of the at least one suction channel (46). Rear wall (38) after one of Claims 8 to 11 , characterized in that at least one cross-sectional constriction (80) extends across the width of the at least one suction channel (46). Rear wall (38) after one of Claims 8 to 12 , characterized in that at least one cross-sectional constriction (80) is realized by a corresponding bend (82) of at least one corresponding inner rear wall part (42) and / or by a corresponding bend (82) of at least one corresponding outer rear wall part (40). Rear wall (38) after one of Claims 8 to 13 , characterized in that a depth (84) of the at least one suction channel (46) in the region of at least one cross-sectional constriction (80) approximately between 50 mm and 90 mm and / or and a depth (86) of the at least one suction channel (46) outside the at least one cross-sectional constriction (80) is approximately between 60 mm and 140 mm. Rear wall (38) after one of Claims 8 to 14 , characterized in that a depth of the at least one suction channel (46) in the region of at least one cross-sectional constriction (80) and / or outside of the at least one cross-sectional constriction (80) is adjustable. Rear wall (38) for a wind raking chamber (18) of a spreader (10), wherein the spreader (10) for forming a grit mat (12) on a forming belt (14) in the course of the production of material plates in a direction of production (16) subsequent press Serves, characterized in that the rear wall (38) at least one outer rear wall part (40) and at least one inner rear wall part (42), between which at least one suction channel (46) for sucking air and particles from the interior (44) of the windbreak chamber (18), wherein at least one of the rear wall parts (42) is directly or indirectly connected to at least one vibrator (76) so that the vibrations generated by the at least one vibrator (76) are transmitted to the at least one rear wall part (42) can. Rear wall (38) to Claim 16 , characterized in that at least one vibrator (76) is attached to at least one rear wall part (40, 42) and acts directly on this vibration transmitting and / or at least one vibrator (76) separate from the at least one rear wall part (42) is fixed and indirectly engages on the at least one rear wall part (42) by means of at least one vibration-transmitting connection (78). Rear wall (38) to Claim 16 or 17 , characterized in that the at least one vibrator (76) on the outer rear wall part (40) is arranged, which is connected by at least one mechanical connection (78) vibration transmitting with at least one inner rear wall part (42). Rear wall (38) after one of Claims 16 to 18 , characterized in that at least one vibrator (76) is operated pneumatically and / or electrically and / or magnetically. Rear wall (38) after one of Claims 16 to 19 , characterized in that a vibration frequency of at least one vibrator (76) is adjustable. Scattering machine (10) for forming a spreading material mat (12) on a forming belt (14) in the course of the production of material plates in a downstream in the production direction (16) press, with at least one Windstreukammer (18), at the end of a rear wall (38) is characterized in that the rear wall (38) according to one of Claims 1 to 20 is trained.

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