DE3806070C1 - Process and installation for continuously producing sandwich elements - Google Patents

Abstract

In the continuous production of sandwich elements, which comprise a foam core (30) and, preferably metallic, outer layers (4), when cutting the extruded profile (12) to length so as to form sandwich elements (13, 14, 15), in order to avoid scratches on the surfaces, caused by dust and swarf, there is arranged downstream of the cutting-to-length apparatus (5) a cleaning apparatus (6), by means of which the ends of the sandwich elements (13, 14, 15) are freed of dust and sawing swarf. <IMAGE>

Description

The invention relates to a method and a system for continuous production of sandwich elements with a foam core between two cover layers, whereby a foamable reaction mixture between the deck Foam layers and harden to the foam core is left and then this foam profile cyclically to sandwich elements of the desired length will cut.

In the production of such, mainly plate-shaped ger, sandwich elements has the disadvantage that when Cut the resulting sawdust or chips to length the sandwich elements lie or stick. Abge see from the optically disadvantageous impression ins especially for sandwich elements with a metallic deck layers, such as aluminum sheets or steel sheets that Danger that the sawdust from the same material the be layered or painted surfaces of the top layer scratch when the sandwich elements are stacked will.  

It is known (DE-OS 25 31 346) sandwich elements with a foam core between two outer layers produce and then the sandwich profile obtained cyclically to sandwich elements of the desired length across cut. The waste is cut into a suction hood sucked through a suction pipe with a blower connected is. Adhering to the surfaces of the elements Particles can usually be removed by suction do not remove.

There is the task, the procedure and the installation of the to improve the aforementioned type so that sandwich elements are obtained which are free of sawdust and saw chips to avoid scratches.

This problem is solved in that after cutting to length two successive sandwich elements each be detected, of which the first sandwich element is accelerated so that between the first and the a desired gap is created in the second sandwich element, that then the two mutually facing ends of the two sandwich elements at least on the top and front be cleaned on both sides; that then both sandwiches elements are released and the first sandwich element is transported away while the second sandwich element in place of the first and a third in place the second occurs that the second, now the first representing, and the third, now representing the second posed, captured, etc.

This ensures that immediately after cutting the Sandwich elements from the endless, dealing with production speed advancing strand profile Sawdust and sawdust are removed. It prepares for the expert no difficulty, the cleaning to make or adjust so that no scratches caused. The cleaning of every sandwich element takes place in two stages: namely first the Cleaning the front end in the first stage and the Cleaning the rear end in the second stage. Here the sandwich elements cut to length are preferably with  the production speed to the cleaning process performed, this production speed of loading acceleration process of the first sandwich element is stored. It is understood that at the beginning of the process rens a sandwich element is detected alone and after the Cleaning its front end then the one described Process begins. At the end of a product phase, the last sandwich element undergoes cleaning the rear end alone. Because the continuous Production, however, usually for hours without a break is running, the start and end of the procedure are in the frame of the new process as special steps casual.

In GAK 4/77, pages 200 to 204, especially page 202, is already suggested, with the periodic cutting that of the sandwich profiles to be the first element accelerate, d. H. with increased transport speed to subtract from the expiring plate strand, where through between the first and second elements Gap arises. Although it is pointed out that the generated elements have a sensitive surface, no cleaning step is provided.  

After cleaning, the first sandwich is preferred element delayed again and only afterwards for transport animals released.

Especially if the delay lasts so long that the previously formed gap can be closed again the removal of the first sandwich element alone by replenishing the second.

According to a special embodiment, the Rei aspirated particles.

In this way it is avoided that sawdust and Sawdust in other places after whirling up drop.

According to a special implementation of the method the ends of the sandwich elements are swept.  

According to a further embodiment, if necessary in combination with the first implementation blown off the ends of the sandwich elements.

When sweeping, the cleaning is more intensive because of the mechanical touch also strongly adhering parts goblets can be removed. Cleaning by sweeping is also therefore particularly advantageous because with the corresponding Pressure applied to the cut edges of the cover layers be congratulated. When blowing off it can happen that the Not cut edges with every cover layer material the air jet is deburred enough.

According to a further special embodiment of the new process will be the first sandwich element on front end and the second sandwich element at the rear End captures and the cleaning process of the front and cover the rear end of each sandwich element each other locally.

This ensures that the entire Surface of the sandwich element is cleaned.

The plant for the continuous production of sand wichelemente with foam core starts from one Double conveyor belt with feeder for one foamable reaction mixture and with feeds for Cover layers and one after the double conveyor belt arranged cutting device.

What is new is the fact that the cutting device a cleaning device is assigned, consisting from a carriage that can be moved in the production direction,  which cleaning elements and clamps for two has the following sandwich elements, the Klem for the first sandwich element inside the car are arranged displaceably in the production direction that the cleaning elements are movable and that the movement processes of trolleys, clamps and cleaning elements on the production speed, length of the sandwich elements or cutting cycle of the cutting device are true.

Should the sandwich elements also be cut on the side be, it is appropriate to have a trimming device preferably between the double belt and the cutting device, to provide.

After gripping the two sandwich elements it moves the car at production speed and after He releases the sandwich elements in an abge agreed speed again to now the to capture the next two sandwich elements etc. It it goes without saying that they are somehow supported as long as they are not pinched. Such The Reini are allowed to take tours or support Do not hinder their function in their function. The Force to clamp or move the clamps expediently hydraulically or pneumatically brings.

According to a particular embodiment, the lengths are device and the cleaning device on a ge arranged common wagon. With this combination the technical effort is reduced.  

The cleaning elements are preferably suctioned off direction assigned.

This ensures that particles are whirled up be sucked off directly before it is again on the Can put sandwich elements.

The cleaning elements are preferably on movable, path-controlled brackets arranged.

This embodiment enables the cleaning element elements over the surface of the ends of the sand to lead important elements. This can be done, for example perform in such a way that according to a predetermined First program the tops of the ends to cut edge to be cleaned, then the end faces and finally the sub pages. But it is also possible for the top and bottom sides as well as for the Front surfaces, if necessary, separate cleaning elements to provide.

The cleaning elements preferably consist of To brush.

Alternatively or in combination so the cleaning elements consist of blow nozzles.

It is possible and sensible to open the suction device to provide the holders for the cleaning elements.

According to another embodiment, there is suction device from at least one of the cleaning areas enclosing suction chamber.  

The brushes preferably consist of rotating brushes most, their rotational speed on the material the top layers of the sandwich elements are coordinated.

It is particularly advantageous if the brush coating is on the material of the cover layers of the sandwich elements is correct.

Plastic is particularly suitable as brush coverings asern corresponding hardness, fluffy fiber coverings and soft foam coverings. With paper cover layers or those made of thin films become fluffy coverings or prefer soft foam. With metal Sheet cover layers are more advantageous because fiber brushes with them the metal chips can be grasped better and one better deburring of the cut edges can be achieved.

Using blow nozzles as cleaning elements, are of course the blowing pressure and the blowing angle also from Influence. In any case, it should be ensured that blowing the cut edges is not in the way there is a detachment of the outer layers from the foam fabric core is made. In any case, one can guarantee particularly gentle cleaning of the outer layers Afford. It is particularly advantageous if the Reini surface in the direction of the cut edges. If you use rotating brushes, should their direction of rotation in the feed direction of the Reini elements away from the surface to be cleaned be set. This way one becomes special good deburring of the cut edges achieved without the There is a risk that the outer layers of the foam Loosen the fabric core.

In the drawing, the new system is in several versions Examples are shown purely schematically and after standing explained in more detail. It shows

Fig. 1, the entire system in a side view;

Figs. 2 and 3, the cleaning device in the further operating positions and

Fig. 4 to 6 special embodiments of the cleaning device.

In Fig. 1, the system consists of a double conveyor belt 1 with a feed device 2 for a foamable reaction mixture and from guides 3 for cover layers 4 and a downstream cutting device 5th A cleaning device 6 is assigned to this. It consists of a carriage 7 and rails 8 on which this carriage 7 and the Ablängvor direction 5 are movable. The carriage 7 consists essentially of a room 10 provided with wheels 9 , which is designed tunnel-like. In it laterally retractable and extendable roller guides 11 are supported for the sandwich elements 13, 14, 15 cut to length from the extruded profile 12 in order to support them. On the frame 10 clamping jaws 16, 17, 18 and 19 are provided. The clamping jaws 17 and 19 can be actuated hydraulically or pneumatically in order to apply the clamping force in the vertical direction. The jaws 18 and 19 are on the frame 10 in rails 20, 21 by means of hydraulic or pneumatic Kolbenzylin der Units 22, 23 longitudinally displaceable. The jaws pairs 16 and 17 and 18 and 19 each have a cleaning element 24, 25 assigned, each of which consists of a telescopic, path-controlled holder 26, 27 and a rotating brush 28, 29 . The most Bür 28, 29 have perforated shafts, which are hollow and are connected to a suction device, not shown, so that whirled up dust and chips are immediately extracted. The drives for the cutting device 5 and the cleaning device 6 and the program control device are not shown.

The procedure is as follows:

On the lower, made of aluminum sheet cover layer 4 is at the entrance of the double conveyor belt 1 by means of the feed device 2 give a liquid, polyurethane foam reaction mixture which foams to a foam core 30 and thereby with both the lower and the upper cover layer 4 , which also consists of an aluminum sheet, glued. The production speed is 5 m / min. By means of a existing from a circular saw cutting device 5 , which can be moved at the production speed, the endlessly finished extruded profile 12 is cut into plate-like sandwich elements 13, 14, 15 of the desired length. This produces on the surface layers 4 prevent depositing chips and sawdust and layers on the cut edges of the cover 4 forms a ridge. The operation of the cleaning device 6 is speed on the Produktionsge and agrees abge the desired plate length and Control Module via a non-illustrated program the whole complex. To do this, use conventional control aids, not shown, such as limit switches, etc. Knowing the desired functional sequence means that the control technology specialist has no difficulty in realizing a corresponding control.

In Fig. 1, the carriage 7 of the cleaning device 6 is in the ready position for a cleaning process by the clamping jaws 17 and 19 are still inactive and the roller guides 11 are retracted in order to support the sandwich elements 13 and 14 . Due to the program control, the sandwich elements 13 and 14 are in the desired position between the jaws 16, 17 and 18, 19th

Now the clamping jaws 17 and 19 are actuated and the sandwich elements 13, 14 are clamped in, as shown in FIG. 2.

While the roller guides 11 arranged between the jaws 16 and 18 are pulled off to the side, the first sandwich element 13 is accelerated by means of the piston-cylinder units 22 and 23, the jaws 18 and 19 being displaced in the production direction in addition to the production speed. In this way, a gap 31 is formed between the first sandwich element 13 and the second sandwich element 14 , as shown in FIG. 3.

During the displacement of the sandwich element 13, the brushes 28, 29 begin to rotate and vacuum, and are moved in the direction of the gap 31 in order to clean the rear end 32 of the sandwich element 13 and the front end 33 of the sandwich element 14 . The brushes 28, 29 ro animals in the feed direction away from the cover layer 4 and deburr the cut edges of the cover layers 4th Then the brushes are guided over the end sides of the sandwich elements 13 and 14 , lift off, are brought up to the jaws 16 and 18 to now sweep the undersides of the ends 32 and 33 in Rich device gap 31 . The cut edges of the lower cover layer 4 are also deburred and then the brushes 28, 29 return to their original position. Then the piston-cylinder units 22, 23 pull the jaws 18 and 19 with the one clamped sandwich element 13 back against the sandwich element 14 to close the gap 31 . The roller guides 11 are now retracted and the jaws 17 and 19 are lifted off. The carriage 7 now travels again in the direction of the cutting device 5 , the sandwiching element 14 now taking the place of the sandwich element 13 and the sandwich element 15 that of the sandwich element 14 . The new positions of the sandwich elements 14 and 15 now correspond to the positions of the sandwich elements 13 and 14 shown in FIG. 1, while the original sandwich element 13 , now designated 34 in FIG. 3, is transported away.

In the exemplary embodiment according to FIG. 4, rails 41, 42 are provided as cleaning elements 43, 44 transverse, rotating, long-fiber brushes. They work in a suction device 45 designed as a suction chamber. An intermediate wall 46 arranged between the brushes 43, 44 has an opening 47 for the passage of the sandwich elements 48, 49 .

In the embodiment according to FIG. 5, slot nozzles pivotable about a transverse axis are provided as cleaning elements 51, 52 , from which an air jet emerges. They are also arranged in a suction device 53 designed as a suction chamber. Here, too, an intermediate wall 54 has an opening 55 for the passage of the sandwich elements 56, 57 .

In the exemplary embodiment according to FIG. 6, vertically displaceable slot nozzles are provided in rails 61, 62 as cleaning elements 63, 64 , from which an air jet emerges. They are also arranged in a suction device 65 designed as a suction chamber. This has an intermediate wall 66 with an opening 67 for carrying out the sandwich elements 68, 69 .

The combination of the cutting device 5 and the cleaning device 6 on a common carriage 7 is easily imaginable, so that it does not require a drawing Dar position of this embodiment. In this case, the sandwich profile 12 is first severed by means of the cutting device 5 and immediately after the resulting cutting gap is enlarged as much as is necessary for the subsequent cleaning procedure.

Claims (15)

1. A method for the continuous production of sandwich wichelemente ( 13, 14, 15, 34 ) with a foam core ( 30 ) between two outer layers ( 4 ), where foam at a foamable reaction mixture between the outer layers ( 4 ) and to the foam core ( 30 ) is allowed to harden, and this sand wichprofil ( 12 ) is then cut cyclically to sandwich elements ( 13, 14, 15, 34 ) of the desired length, characterized in that after cutting two successive sand wichelemente ( 13, 14 ) cyclically are detected, of which the first sandwich element ( 13 ) is accelerated, so that between the first sandwich element ( 13 ) and the second sandwich element ( 14 ) a desired gap ( 31 ) is created, that then at the mutually facing ends ( 32, 33 ) the two sandwich elements ( 13, 14 ) are cleaned at least on the top and on the front; that then both sandwich elements ( 13, 14 ) are released and the first sandwich element ( 13 ) is removed while the second sandwich element ( 14 ) takes the place of the first ( 13 ) and a third ( 15 ) takes the place of the second ( 14 ) that the second ( 14 ), now representing the first ( 13 ) and the third ( 15 ), now representing the second ( 14 ), are detected, etc. 2. The method according to claim 1, characterized in that after cleaning, the first sandwich element ( 13 ) is delayed again and only then released for Abtrans port. 3. The method according to claim 1, characterized in that whirled up particles are sucked off. 4. The method according to any one of claims 1, 2 or 3, characterized in that the ends ( 32, 33 ) of the sandwich elements ( 13, 14 ) are swept and, if necessary, the cut edges of the sandwich elements ( 13, 14 ) are deburred. 5. The method according to any one of claims 1, 2 or 3, characterized in that the ends of the sandwich elements ( 56, 57; 68, 69 ) are blown off. 6. The method according to any one of claims 1 to 5, characterized in that the first sandwich element ( 13 ) at the front end and the second sandwich element ( 14 ) at the rear end are detected and that the cleaning operations of the front ( 33 ) and the rear end Ren ( 32 ) each sandwich element ( 13, 14 ) overlap each other locally. 7. Plant for the continuous production of sandwiching elements ( 13, 14, 15, 34; 48, 49; 56, 57; 68, 69 ) with foam core ( 30 ), consisting of a double conveyor belt ( 1 ) with a feed device ( 2 ) for one foamable reaction mixture and from feeds ( 3 ) for cover layers ( 4 ), and a cutting device ( 5 ) arranged downstream of the double conveyor belt ( 1 ), characterized in that the cutting device ( 5 ) is assigned a cleaning device ( 6 ), consisting of a in Pro Production direction movable carriage ( 7 ), which cleaning elements ( 24, 25; 43, 44; 51, 52; 63, 64 ) and clamps ( 16, 17, 18, 19 ) for two successive sandwich elements ( 13, 14; 48, 49 ; 56, 57; 68, 69 ), the clamps ( 18, 19 ) for the first sandwich element ( 13 ) being displaceable in the production direction within the carriage ( 7 ) such that the cleaning elements ( 24, 25; 43, 44; 51, 52; 63, 64 ) are movable, and that the movement sequences of Carriage ( 7 ), clamps ( 16, 17, 18, 19 ) and cleaning elements ( 24, 25; 43, 44; 51, 52; 63, 64 ) on the production speed, length of the sandwich elements ( 13, 14, 15, 34; 48, 49; 56, 57; 68, 69 ) or cutting cycle of the Ablängvorrich device ( 5 ) are coordinated. 8. Plant according to claim 7, characterized in that the cutting device ( 5 ) and the Reinigungsvor direction ( 6 ) on a common carriage ( 7 ) are arranged. 9. Plant according to claim 7 or 8, characterized in that the cleaning elements ( 24, 25; 43, 44; 51, 52; 63,64 ) is assigned a suction device ( 24, 25; 45; 53; 65 ). 10. Plant according to one of claims 7, 8 or 9, characterized in that the suction device ( 45; 53; 65 ) consists of at least one suction chamber including the cleaning area ( 45; 53; 65 ). 11. Installation according to one of claims 7 to 10, characterized in that the cleaning elements ( 28, 29 ) movable, path-controlled holders ( 26, 27 ). 12. Plant according to one of claims 7 to 11, characterized in that the cleaning elements ( 51, 52; 63, 64 ) consist of blow nozzles ( 51, 52; 64, 64 ). 13. Plant according to one of claims 7 to 12, characterized in that the cleaning elements ( 24, 25; 43, 44 ) consist of brushes ( 28, 29; 43, 44 ). 14. Plant according to claim 13, characterized in that the brushes ( 28, 29; 43, 44 ) consist of rotating brushes whose rotational speed on the material of the outer layers ( 4 ) of the sand wichelemente ( 13, 14, 15, 34; 48 , 49 ) is coordinated. 15. Plant according to one of claims 13 or 14, characterized in that the brush coating on the Mate rial of the cover layers ( 4 ) of the sandwich elements ( 13, 14, 15, 34; 48, 49 ) is matched.