DE202019103691U1 - Device for transporting a fleece - Google Patents

Abstract

Device for transporting a fleece with two endless belts, preferably in the course of the production of material panels from a scattered pressed material mat, a first belt (3) and a second belt (4) being arranged in this way in the device for transporting a fleece (1) that the underside (12) of the fleece (1) resting on the belts (3, 4) is transported in the transport direction (10) and a transfer gap (9) is formed between the first and the second belt, characterized in that a Transfer device (2) for transporting the fleece (1) is arranged in the area of the transfer gap (9).

Description

The invention relates to a device for transporting a fleece with two endlessly revolving belts, preferably in the course of the production of material panels from a scattered pressed material mat, according to the preamble of claim 1.

• - hohe Festigkeit bei der Vorpressung oder
• - Durchlässigkeit bei der pneumatischen Vorwärmung oder
• - Permeabilität für Mikrowellen.

In the production of material panels from scatterable materials, a material, usually a mixture of particles or fibrous substances and a binding agent, is scattered to form a grit mat on a molding or conveyor belt, with the grit mat then, if necessary, being fed to the necessary pretreatment and finally to pressing .
The compression can be carried out continuously or discontinuously by means of pressure and heat. As a rule, these are chipboard, fiber or chipboard panels. The scattering takes place in one or more layers, as required, the need for several layers usually occurring in the manufacture of thicker panels.
Almost all types of production have in common that, for technological reasons, at least one transition between two belts transporting the fleece is necessary before the fleece can be introduced into a press. Examples would be transitions from a forming belt to a pre-pressing or preheating belt. Forming belts are usually very long and connect several spreading machines until the structure of the fleece is created. Pre-press or preheating belts require different properties such as

• - high strength during pre-compression or
• - Permeability with pneumatic preheating or
• - Microwave permeability.

It is therefore technologically necessary to separate expensive special areas from the molding area with regard to the belts.

From the EP 1 782 933 B1 a method and a device for producing material panels from a fleece are known, in which defective fleece areas are disposed of in a chute and, if necessary, recycled. For this purpose, a transfer gap is provided between two transporting belts, which is enlarged by a reversing belt nose in the event that a defective mat is dropped. In normal operation, the transfer gap is kept as small as possible.

From the EP 2 247 418 B1 a method and a device for preheating a pressed material mat has become known, which also provides a transition between two transporting belts for a fleece.

This is arranged here between a forming area for creating the fleece and a microwave preheating.

It is therefore disadvantageous in the known systems or transport areas that the fleece has to pass at least one transition between two endlessly circulating forming belts. The risk for production is that parts of the fleece could break off or fall off and disappear in the transfer gap. In addition, the bottom or the surface can be damaged during the transition if the mat is deformed too much or sags. The radii of the pulleys are usually kept as small as possible. But this is a balance between two disadvantages. If the radius of the pulley is too small for the belt, it wears out faster. If the radius is too large, the transition is too wide and the fleece is damaged.

The object of the present invention is to create a device with which it is possible to minimize or avoid the above-mentioned disadvantages. In particular, it should be possible to overcome not only small transitions but also larger transitions with little effort and as little risk as possible for the fleece.

In an extension of the task, it should be possible to integrate at least one further technologically sensible or necessary process step in the transfer device in the production of nonwovens or their pressing into material panels.

The invention is based on a device for transporting a fleece with two endlessly revolving belts, which is preferably used in the course of the production of material panels from a scattered pressed material mat, a first belt and a second belt being arranged in this way in the device for transporting a fleece that the underside of the fleece is transported lying on the belts in the transport direction and a transfer gap is formed between the first and the second belt.

The object is achieved for the device in that a transfer device for transporting the fleece is arranged in the area of the transfer gap.

The invention understands the device essentially as a flat or horizontal transport in one plane, the fleece changing from one belt to the next and the transporting surfaces of the belts preferably being arranged in the same plane. Since the fleece is sensitive to kinks or bending, only one can be used if the second belt is positioned higher or lower small difference in height can be overcome. This difference in height is preferably not greater than the height of the corresponding fleece.

The following possible alternative design features can be used together, separately or in any combination according to the invention.

An endlessly revolving and permeable transfer belt with an associated vacuum device for sucking the top of the fleece through the transfer belt can preferably be arranged as the transfer device on the top side of the fleece.

Alternatively or cumulatively, the transfer belt can be arranged to cover the transfer gap and at least partially the first belt and / or the second belt.

The first belt and the second belt could be arranged for transport in the same or in a different transport plane.

The drives for the belts and the transfer belt could preferably be arranged in a synchronized manner for a uniform speed in the transport direction, preferably via a control device.

In a further alternative, a spray device for wetting the underside and / or the upper side of the fleece, preferably with water, can be arranged before, after and / or in the transfer gap.

A heating device, preferably a pneumatic heating device with steam and / or hot air, for the fleece can also be arranged in the transfer gap or within one of the endlessly circulating transporting belts.

In a further possible embodiment, means for separating the fleece from the corresponding belt can be arranged in the transport direction before the transfer gap on the first belt, after the transfer gap on the transfer belt and / or in the transfer gap itself, these means preferably being vibration and / or compressed air devices.

• - eine Reinigungsvorrichtung für das Übergabeband;
• - im oder in Transportvorrichtung vor dem Übergabespalt eine Einrichtung zur Ermittlung von Fremdkörpern;
• - unterhalb des Übergabespalts eine Auffangvorrichtung für das Vlies;
• - eine Vorpresse zur Verdichtung des Vlieses, bevorzugt vor dem Übergabespalt;
• - eine Steuerungsvorrichtung zur Verarbeitung eins Signales von der Einrichtung zur Ermittlung von Fremdkörpern, die geeignet ist bei einem entsprechenden Signal die Abschaltung oder Umschaltung der

Alternatively or cumulatively, the following features can be used:

• - A cleaning device for the transfer belt;
• - In or in the transport device in front of the transfer gap a device for determining foreign bodies;
• - Below the transfer gap a collecting device for the fleece;
• - A pre-press for compacting the fleece, preferably in front of the transfer gap;
• - A control device for processing a signal from the device for determining foreign bodies, which is suitable for switching off or switching the in the event of a corresponding signal

To effect transfer device for diverting the fleece into the collecting device.

In an advantageous manner, it is now possible in the production of thin sheets of less than 12 mm, preferably thinner than 7 mm and most preferably in the production of thin sheets of less than 4 mm thickness, a transition of the not yet pressed fleece, also called pressed material mat, from One conveyor belt to another conveyor belt to ensure that production is not essentially affected by the transition. Surface defects, cracks or other damage can almost be ruled out. Essentially all technologically-related transitions in the production of fleece or pressed material mats come into question for use, especially when using lignocellulosic materials in MDF, THDF, HDF, PB production. But even when using OSB residues, recycling materials, plastics, straw, rice, textiles, cellulose and mixtures thereof, there are advantages in the application of the invention.

In a further advantageous embodiment, it is now even possible to compensate for height differences between a first and a second band. This may be particularly useful if the entire molding strand for producing the pressed material mat is arranged on one level and a change in the transport level appears to be necessary for certain applications. This may be necessary if the transfer belt for transferring the fleece to a press reaches its limits with regard to its height adjustability or if the center of the fleece is to be adjusted by its transport plane when it is preheated with a microwave.

In an advantageous manner, it is now possible to integrate at least one further technologically meaningful or necessary process step or a corresponding device in the production of nonwovens or their pressing into material panels in a transfer device according to the invention.

• - Vorwärmung mit Dampf
• - Erkennung von Fremdmaterial
• - Aussonderung fehlerhafter Vliesbereiche
• - Befeuchtung der unteren und/oder oberen Oberfläche
• - Vorpressung vor und/oder nach dem Übergabespalt

A possible process step or device could be:

• - Preheating with steam
• - Detection of foreign material
• - Separation of defective fleece areas
• - Moistening of the lower and / or upper surface
• - Pre-compression before and / or after the transfer gap

Further advantageous measures and embodiments of the subject matter of the invention emerge from the dependent claims and the following description with the drawing.

• 1 eine schematische Seitenansicht der erfindungsgemäßen Vorrichtung im Leerlauf,
• 2 die Ansicht nach 1 mit Transport eines Vlieses in Transportrichtung und
• 3 die Ansicht nach 1 oder 2 während dem Abwurf des Vlieses in die Auffangvorrichtung.

Show it:

• 1 a schematic side view of the device according to the invention at idle,
• 2 the view 1 with transport of a fleece in transport direction and
• 3 the view 1 or 2 while the fleece is thrown into the collecting device.

The drawing shows a device according to the invention for transporting a fleece 1 along a transport direction 10 . The same reference symbols designate the same device features, each figure corresponds to a different possible exemplary embodiment and show separate operating states, such as idling ( 1 ), Normal operation ( 2 ) and exceptional operation ( 3 ).

In 1 is a schematic side view of a device for transporting a fleece with two endless belts 3 , 4th shown without the fleece to be transported. The bands 3 and 4th are essentially in one plane and form a transfer gap between them 9 over which the fleece must be transported. The transfer gap 9 can be made as small as possible and the collection device shown 8th is only an optional possibility to incorporate a further process step in the transfer area. The invention is preferably used around short transitions that are gentle on the fleece 1 to overcome.

In the embodiment shown, there is a possibility of ejection, for example if the fleece 1 but not with the tape 4th is to be transported further. As a transfer device 2 , to overcome the transfer gap 9 , is an around pulleys 16 endless transfer belt 5 above the ligaments 3 and 4th arranged, which are also endlessly revolving over pulleys 16 be guided. The transfer belt is at least in the transfer area 9 parallel to the surface of the fleece 1 and the opposite ligaments 3 , 4th respectively their transport level. The transport plane is preferably understood to mean the plane in which the bottom 12 of the fleece 1 to be led.
There are also various optional devices in the transfer device 2 or with the bands 3 and 4th . These could be spray devices 14th for spraying the top 11 or the bottom 12 of the fleece 1 his. It can be a heating device 15th be arranged, which is preferably within the first band 3 is arranged. The belt can be used for the injection of thermal elements such as steam or hot air 3 be made permeable. Also can means of separation 7th of the fleece 1 from the tapes 3 , 4th or the transfer belt 5 be arranged. These would be vibration devices or compressed air nozzles, for example. These can not only act passively but also actively, for example in the transfer gap 9 be arranged by yourself. Instead of or with the wetting nozzles 14th .

In 2 becomes a fleece with its top 11 and bottom 12 passed through the device and is off the belt 3 by means of the vacuum device 6th , which through the permeable transfer belt 5 can act through it, lifted and floating over the transfer gap 9 transported. Then the fleece 1 from the transfer belt 5 to the second tape 4th and if necessary with the means for separating 7th from the transfer belt 5 solved. The transfer belt is then returned 5 in a cleaning device 13 cleaned before putting it over the pulleys 16 again in contact with the next area of the fleece 1 comes.

In an advantageous manner, various process aspects can now also be accommodated in this area, as a result of which a corresponding system can be made shorter or improved if necessary.

In the 3 is for example a prepress 17th arranged which the fleece 1 before lifting off the belt 3 compacted so that it can be transported more gently.

In the 3 it is also shown that when the transfer device is switched off 2 the fleece in a collecting device 8th can be discarded for either disposal or reuse later.

List of reference symbols

1.

fleece

2.

Transfer device

3.

Band (first)

4th

Band (second)

5.

Transfer belt

6.

Vacuum device

7th

Means of separation

8th.

Catching device

9.

Transfer gap

10.

Transport direction

11.

Top

12.

bottom

13.

Cleaning device

14th

Spray device

15th

Heater

16.

Pulleys

17th

Prepress

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• EP 1782933 B1 [0004]
• EP 2247418 B1 [0005]

Claims (13)

Device for transporting a fleece with two endless belts, preferably in the course of the production of material panels from a scattered pressed material mat, a first belt (3) and a second belt (4) being arranged in this way in the device for transporting a fleece (1) that the underside (12) of the fleece (1) resting on the belts (3, 4) is transported in the transport direction (10) and a transfer gap (9) is formed between the first and the second belt, characterized in that a Transfer device (2) for transporting the fleece (1) is arranged in the area of the transfer gap (9). Device according to Claim 1 , characterized in that in the transfer device (2) on the top (11) of the fleece (1) an endlessly revolving and permeable transfer belt (5) with an associated vacuum device (6) for sucking in the top (12) of the fleece (1) is arranged by the transfer belt (5). Device at least according to one of the preceding claims, characterized in that the transfer belt (5) is arranged to cover the transfer gap (9) and at least partially the first belt (3) and / or the second belt (4). Device at least according to one of the preceding claims, characterized in that the first belt (3) and the second belt (4) are arranged for transport in the same or in a different transport plane. Device at least according to one of the preceding claims, characterized in that the drives of the belts (3, 4) and the transfer belt (5) are arranged synchronized for a uniform speed in the transport direction (10), preferably via a control device. Device at least according to one of the preceding claims, characterized in that in front of, after and / or in the transfer gap (9) a spray device (14) for wetting the underside (12) and / or the upper side (11) of the fleece (1) is preferred with water Device at least according to one of the preceding claims, characterized in that in the transfer gap (9) or within one of the endlessly circulating transporting belts (3, 4) a heating device (15), preferably a pneumatic heating device with steam and / or hot air, for the fleece (1) is arranged. Device at least according to one of the preceding claims, characterized in that in the transport direction (10) before the transfer gap (9) on the first belt (3), after the transfer gap (9) on the transfer belt (5) and / or in the transfer gap (9) itself Means for separating (7) the fleece from the corresponding band are arranged, these means preferably being vibration and / or compressed air devices. Device at least according to one of the preceding claims, characterized in that a cleaning device (13) is arranged for the transfer belt (13). Device at least according to one of the preceding claims, characterized in that a device for determining foreign bodies is arranged in or in the transport device (10) in front of the transfer gap (9). Device at least according to one of the preceding claims, characterized in that a collecting device (8) for the fleece is arranged below the transfer gap (9). Device at least according to one of the preceding claims, characterized in that a pre-press (17) is arranged. Device at least according to one of the preceding claims, characterized in that a control device for processing a signal from the device for determining foreign bodies is arranged, which is suitable for switching off or switching over the transfer device (2) for diverting the fleece (1) when a corresponding signal is received ) in the collecting device (8).

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