DE102007056109A1 - Device for air separation from spread material during spreading of material on pressed material mat for manufacturing material plate in press, has air inlet vent whose width corresponds to width of ventilator - Google Patents

Abstract

The device has a housing (15) including a primary part formed in an undulated shape and widened from an air inlet vent (18) to an air outlet vent (19) from a width to another width or formed in a helical shape and widened from the air inlet vent to the air outlet vent from the former width to latter width over a rotation angle of 270 degrees. The former width at the air inlet vent corresponds to a width of a ventilator, and the latter width at the air outlet vent corresponds to a width of an air scattering chamber (5).

Description

The The invention relates to a device for air sifting of grit in Scattering of a pressed material mat or a layer thereof according to the preamble of claim 1.

Particleboard and the production of material plates from, for example, medium-density fibers are now automated processes and are already being used in many countries for many years. As in "Wood materials, production and processing" by Hansgert Soiné, DRW-Verlag 1995, pages 17ff described the compression of processed chips or fibers takes place either clock bound or continuously. In addition to the many plant components before and after the press, the production of a spreading material mat by means of spreading machines plays an outstanding role, since the quality of the produced spreading material mat is an important factor in addition to the quality of the raw materials. For the large-scale production of wood-based panels, continuous presses are used. In these presses, as in DE 39 13 991 C2 described, the pressing force is transmitted by hydraulic actuators on the press and heating plates and further on steel belts, which are supported by a rolling element carpet (rolling rods) circumferentially arranged on the grit.

• – Rollenstreuköpfe mit einer Separation über unterschiedliche Spaltbreiten zwischen den Rollen,
• – Wurf-Streuköpfe mit einer Separation über den Impuls und der einhergehenden Abbremsung in der Luft und
• – Windstreuung mit einer Separation nach dem Prinzip eines Horizontalsichters.

The structure of the spreaders for producing a pressed product mat is usually dependent on the type of chips used or the particles and the most suitable method to deposit these chips as evenly as possible with respect to the basis weight on a forming belt or scatter. Separating scattering of chips or other free-flowing material can be achieved, for example, with the aid of the following machine and plant types:

• Roll baffles with a separation over different gap widths between the rolls,
• - Throwing heads with a separation over the pulse and the concomitant deceleration in the air and
• - Wind scattering with a separation according to the principle of a horizontal sight.

These Methods are also adequately described in the above-mentioned literature. Windscatter is the most widely used and applied today Method. Sensitive to external and internal fluctuations, which inevitably affect every production process, become the spreading pattern and the straightening in the wind scattering affected.

Outer Fluctuations are caused, for example, by irregularities in the spit composition or fluctuating material flow rates which may occur due to the plant, but not directly depend on the type of spreading machine used. Inner Variations caused by blockages, caking or irregularities in the production of the air flow or in their passage through the plant. Through the interaction of the outer and internal variations, it is preferably the concern of the equipment manufacturer, the inner fluctuations in the wind scattering possible to minimize or turn off, as the outer Variations caused by other devices or procedures will be there to fix.

in principle it is necessary for wind sprinklers evenly and optimized introduction and provision of airflow in or for the windbreak chamber, so that there the grit classified and deposited evenly on the forming belt can be.

Out The prior art has two basic types of Distribution systems between the air supply (fan) and the air inflow into the windbreak chamber known.

In the first kind after the "Chipboard Primer" by Wolfgang Heller, 1995, page 174, picture 97, 1995 , several supply air ducts, which are arranged above the height and width in front of the windbreak chamber, are supplied with a horizontal duct. The air volume can be adjusted via a flap (valve). The distribution of the air flow over the height depends on the geometry of the horizontal channel and the connection angle of the connected air supply pipes. The width, because of several horizontal supply channels, it is possible to adjust the air flow, but not over the height.

in the "Taschenbuch der Spanplattentechnik", Deppe / Ernst, DRW Verlag 2000, page 226, 3.4-9 is a supply air supply via a supply air funnel (diffuser) shown. Here, the air is distributed over a supply air funnel in height and width. The fan has an outlet opening of approx. 300 × 300 mm. The height to which the air is distributed is about 1.3 m and the width can be varied between 1.8 and 3.0 m. If one uses an angle that would ensure optimum distribution, the supply air funnel would be 6 to 15 m long. This would greatly increase the investment costs, since not only the plant itself, but also the enclosed space for a material board manufacturer mean running costs. Through the use of baffles and the possibility of adjustment across the width with register plates, this deficiency in the distribution can be reasonably compensated. It is not possible to adjust the air volume over the altitude. About the horizontally movable registers can only over the distribution the width can be influenced or the lower part can be completely closed.

at Such an air separation chamber is further disadvantageous in that it is particularly disadvantageous at high power the air flow with the grit is pulled down.

At very high power levels (30 m ³ / h and more), the air conditions may tilt.

The Object of the present invention is a device of at the outset described in such a way that while maintaining previous space conditions, or in a small space requirement, an optimal distribution of air flow over the width and an adjustment of the air flow over the height of a Windstreukammer to be supplied possible is. Here, the space or the housing between fan and Windstreukammer executed significantly shortened be without the quality in height and width of the to reduce airflow entering the windstrike chamber.

The Problem for a device is solved by that the initial part of the case either is wavy and is about at least by a turn from the air inlet to the air outlet of one Width a is extended to a width A or that of the initial one Part of the housing is constructed helically and from the air inlet to the air outlet over at least a rotation angle of 270 ° from a width a to a Width A extended, with the width a at the air inlet of the width of the fan used and the width A at the air outlet of the initial housing the width of the windstrike chamber equivalent.

It Now is the teaching of the invention that a simultaneous spread of the Air distribution area of a small area (fan feed) up to the large area of the wind scatter chamber feed in conjunction with adjustment options for adjusting the Airflow in height, width and quantity are counterproductive and not all at the same time should.

Accordingly become the spread of the flowed through area from the fan feed into the flow channel up to towards the feeding of the air flow into the windbreak chamber one after the other carried out, for example, a spread of the Air flow in width not with an adjustment of the Amount of air flow in width may be accompanied. In a preferred design, this is in three different parts of the Housing performed. It is in an advantageous Way with consumption of a very small space, the spread the air flow in the width (perpendicular to the Conveying direction of the forming belt) immediately after infeed the air flow from the fan into the housing of the device performed by means of a helical structure. The air flow rotates either in section v at least 270 ° around the fan axis and will be there spread in width or it is at least once wavy diverted. Subsequently, the air flow occurs in the section w into the housing and is there spread in height, being here parallel to the height spread with register plates an adjustment of the amount of air flow in the width is performed can be. At the end of section w points the air flow an optimal distribution in width and the same order of magnitude opposite the windstrike chamber and can now be seen in the section x be further adjusted. The possibility to adjust the width of the expert needs to adjust the flow conditions the walls of the housing. Just before the airflow into the windbreak chamber can, depending on throughput of grit using adjustment flaps the amount of air flow in height to be adjusted yet. It is beneficial if at a high throughput in the upper area there is a stronger flow to better loosen the falling mass of the grit and to dominate.

Further advantageous measures and embodiments of the subject matter The invention will be apparent from the subclaims and the following Description with the drawing out.

It demonstrate:

1 a schematic side view of an apparatus for air sifting of grit with lying down forming belt and only partially represented Windstreukammer with a partially helical housing between the fan and Windstreukammer according to a first embodiment,

2 a section of the device according to 1 through the housing and the associated fan,

3 a section through the housing after 2 .

4 a section of the device according to a second embodiment with a partially wavy housing and

5 a section through the housing after 4 ,

As in the 1 to 3 shown, can be a device for air separation in several Divide sections. In section y itself is the windstrike chamber 5 with dosing unit arranged above it 1 to see. The dosing unit 1 Brings the necessary amount of grit 2 over a baffle 3 in the windbreak chamber 5 one in which the spreading material finally forms on there 6 is deposited to form a Pressgutmatte. Usually are in the windstrike chamber 5 wind screens 8th arranged for a suitable classification of the material to be spread 2 over the length of the windbreak chamber 5 to care. A little above the band 6 arranged sieve 9 Catches oversized or too heavy particles of the grit 2 and transport them via the coarse material discharge 10 from the air sifting process ..

Optionally, below the baffle 3 at least one rotating spoked roller 4 be arranged, which the spreading material 2 loosens before or during entry into the air stream.

The air flow is through a fan 16 with associated drive 17 generated. The air gets the fan 16 while on the air intake 21 , The air flow in height and width adjusting housing between windbreak chamber 5 and fan 16 is divided in the two embodiments on the three sections v, w, x. The section v corresponds to the initial part of the housing 15 , Section w the second part of the housing 13 and section x the third part of the housing 11 ,

The air flow occurs at air inlet 18 in section v in the helical fan housing 15 and rotates at least 270 ° about the axis of the fan and is thereby of the width a of the air inlet 18 on the width A of the air outlet 19 spread. With 20 the wind direction of the air flow is shown. The first part of the case 15 is a helical rectangular channel. The full width A (corresponds to the width of the windstrike chamber 5 ) is reached when the air flow exits the air 19 achieved and for the section w in the housing 13 replaced. In this case, the section v has a length of only about 1.4 m. Advantageously, the air flow during rotation in the housing 15 pressed against the wall, which favors optimal distribution of air across the width. In section v, the spreading of the air flow is then over the vertical height of the second part of the housing 13 carried out. This is indicated by the housing 13 one downwind 20 rising funnel shape on. To promote the homogenization here are diffuser plates 14 arranged. Finally, section w is followed by section x, which is a straight and rectangular housing 11 having. The housing 11 should be at least 500 mm long in a preferred embodiment. Here is by means of adjustment flaps 12 the volume distribution of the air flow just before entering the windbreak chamber 5 adjusted in height. The air distribution across the width, as in the wind scattering usual over the vertically adjustable register 22 to be influenced. In the diffuser rooms 23a (above), 23b (in the middle) and 23c (below) can be in front of the vertical register 22 be arranged diffuser plates, which have the same or different air resistance.

In 4 and 5 another preferred embodiment is shown. Here is the first part of the case 15 Wavy and the air flow occurs at air inlet 18 at the beginning of section v into the wave-shaped housing 15 and changes at least once the direction and is thereby of the width a of the air inlet 18 on the width A of the air outlet 19 spread.

The housing 15 is a wave-shaped rectangular channel. The full width A (corresponds to the width of the windstrike chamber 5 ) is reached when the air flow exits the air 19 achieved and for the section w in the second part of the housing 13 replaced. Advantageously, the air flow during the deflection in the housing 15 pressed against the wall, which favors optimal distribution of air across the width. In section v, the spreading of the air flow over the vertical height is then carried out. This is indicated by the housing 13 one downwind 20 rising funnel shape on. Finally, section w is followed by section x, which is a straight and rectangular housing 11 having.

It has been found that in both embodiments has resulted in a significant space reduction compared to the prior art and that with an at least constant quality in the windbreak chamber 5 entering airflow. The possibilities for regulating the air flow are also possible according to the prior art.

1

dosing

2

grit

3

baffle

4

spoke roll

5

Wind scattering chamber

6

forming belt

7

press material mat

8th

wind sieve

9

scree

10

coarse material

11

casing

12

adjusting tabs

13

casing (vertically opening)

14

diffuser plates

15

fan housing (horizontally opening)

16

fan

17

drive

18

air inlet

19

air outlet

20

wind direction

21

Air intake

22

register

23a

diffuser space above

23b

diffuser space center

23c

diffuser space below

v, w, x

Sections of the housing 15 . 13 . 11

y

Section of the windbreak chamber 5

a

Width of the housing 15 at air intake 18

A

Width of the housing 15 at air outlet 19

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 3913991 C2 [0002]

Cited non-patent literature

• - "Wood materials, production and processing" by Hansgert Soiné, DRW-Verlag 1995, pages 17ff [0002]
• - "Chipboard fibula" by Wolfgang Heller, 1995, page 174, picture 97, 1995 [0008]
• - "Taschenbuch der Spanplattentechnik", Deppe / Ernst, DRW Verlag 2000, page 226, 3.4-9 [0009]

Claims (6)

Device for air classification of grit ( 2 ), consisting of chips, fibers or the like particles which are usually mixed with a binder, in the course of the scattering of a pressed material mat ( 7 ) or a layer of a pressed material mat ( 7 ) on a continuously moving forming belt ( 6 ) for the production of material plates in a subsequently arranged continuously or discontinuously operating press, wherein the device for air separation, a metering unit ( 1 ), a windbreak chamber ( 5 ) and a fan ( 16 ) with drive ( 17 ) for generating an air flow, wherein between fan ( 16 ) and windscreen chamber ( 5 ) downwind to the height and width of the windbreak chamber ( 5 ) housing, characterized in that the initial part of the housing ( 15 ) is either wave-shaped and extends over at least one turn from the air inlet ( 18 ) to the air outlet ( 19 ) extends from a width (a) to a width (A) or that the initial part of the housing ( 15 ) is snail-shaped and extends from the air inlet ( 18 ) to the air outlet ( 19 ) is extended over at least one angle of rotation of 270 ° from a width (a) to a width (A), wherein the width (a) at the air inlet ( 18 ) the width of the fan used ( 16 ) and the width (A) at the air outlet ( 19 ) of the initial housing ( 15 ) the width of the windscreen chamber ( 5 ) corresponds. Apparatus according to claim 1, characterized in that the second part of the housing ( 13 ) in the wind direction ( 20 ) vertically to the height of the third part of the housing ( 11 ) or the windstrike chamber ( 5 ) corresponds. Device according to claims 1 or 2, characterized in that in the second part of the housing ( 13 ) Diffuser sheets ( 14 ) are arranged to distribute the air flow in the width. Device according to one or more of the preceding claims, characterized in that in the third part of the housing ( 11 ) Adjustment flaps ( 12 ) are arranged for distributing the air flow in height. Device according to one or more of the preceding claims, characterized in that the rectangular area of the third part of the housing ( 11 ) in front of the vertical registers ( 20 ) is at least 500 mm long. Device according to one or more of the preceding claims, characterized in that in the wind direction ( 20 ) in front of the adjustable vertical registers ( 22 ) Diffuser sheets in the diffuser spaces ( 23a . 23b . 23c ) are arranged with the same or different air resistance.