DE102004007238B3 - Apparatus and method for producing sandwich panels - Google Patents

Abstract

The invention relates to a method and an apparatus for producing sandwich panels. The sandwich panels are made fully automatically so that first a bar frame of longitudinal bars 2 and 3 crossbars is joined, in the fan honeycomb inserts 5 are automatically inserted. By means of a lifting unit 7, an upper cover plate 1 is placed and pressed. Subsequently, the upper deck plate 1 is lifted by the lifting unit 7 and placed on a lower deck plate 6, whereby the finished sandwich panel assembly is formed.

Description

The The invention relates to a device and to a manufacturing method for the production of sandwich panels.

sandwich plates are known from the prior art. They consist of a last frame, which forms a free space in which honeycomb inserts, for example made of cardboard or paper, are inserted. The last frame is together with the honeycomb inserts with an upper cover plate and a lower cover plate connected. It is thus possible relatively thick furniture elements to form which - in Compared to conventional Blockboard or chipboard - weigh much less and cheaper can be produced. The lower weight results in a simpler Handling, lower package weights, a reduction of packaging costs and an improved Handling. A particularly favorable Effect is also that the lower weight to a lighter Transportability leads with entrainment furniture.

Out In the prior art, it is known to strip frame manually longitudinal bars and crossbars to assemble and manually cut to size Insert honeycomb inserts. Already this results in a considerable workload, which is reflected in corresponding manufacturing costs. Also hanging up and gluing the top deck plate and the bottom deck plate requires a lot of manual work.

From the EP 1 029 665 A2 , which forms the closest prior art, a method and an apparatus for producing sandwich panels is previously known. In this case, a pre-assembled frame is transported with a honeycomb insert on conveyor belts. At the same time an upper cover plate and a lower cover plate are supplied by means of conveyor belts and placed on the frame with the honeycomb insert, in which case adhesive is applied during the feeding process. It is thus a substantially continuous process, which requires the use of a prefabricated strip frame honeycomb unit.

The DE 88 15 831 U1 shows a sandwich panel for erecting houses, halls, garages and containers, in which in a frame an insulation board, for example, made of mineral fiber material is loosely inserted. In manual processing, a sandwich board is made from this. This requires a high amount of manual labor.

The DE 699 02 735 T2 describes a method for producing a honeycomb core sandwich panel. In this case, a reinforcing insert is placed on both sides of the honeycomb core and a skin on both sides, which each consist of a thermoplastic material. The arrangement thus formed is pre-assembled and heated in an oven. By applying pressure results in a joint connection.

Another method shows the DE 102 54 870 A1 , In this case, a support layer is glued on both sides of a middle layer. The middle layer is plate-shaped and does not consist of several parts that would need to be pre-assembled.

An apparatus for producing door leaves discloses the DE 34 01 233 A1 , Here, a frame is provided with an upper and a lower cover layer.

Of the Invention is based on the object, a method and a device to create the type mentioned, which with a simple structure and ease of handling automated production of sandwich panels allows.

According to the invention Problem solved by the features of the independent claims that respective subclaims show further advantageous embodiments of the invention.

Regarding The device is thus provided that initially a joining device is provided, by means of which a strip frame of longitudinal bars and cross bars is automatically produced. In the joining device, the longitudinal bars and the transverse bars transported by suitable means of transport, positioned, glued and pressed. There is no further manual for this Effort required. Subsequently automatically insert a honeycomb insert by means of a Gripping device for gripping, transporting and inserting the honeycomb insert.

It is understood that according to the invention very different embodiments of last frame are possible. Thus, it is possible to provide a plurality of cross bars to increase the stability of large sandwich panels, especially relatively long and relatively narrow sandwich panels. It is also possible to choose the dimensioning of both the longitudinal bar and the cross bar so that larger sandwich panels can be made by the device, which are subsequently subdivided into smaller plates by the sandwich panels are sawn, for example in the crossbar. It goes without saying that, too Constructions are possible in which a plurality of mutually parallel longitudinal bars, for example three or four such longitudinal bars, are used with a corresponding number of crossbars.

Farther has the device according to the invention a downstream Beleimvorrichtung by means of which the tops and the undersides of the last frame and the honeycomb insert glued become. The gluing can, for example, by glue rollers between which the strip frame together with the inserted Honeycomb insert performed becomes.

According to the invention is still a lifting and transporting device provided to a top cover plate from a ready position (stacking position, magazine position, etc.) take off and transport. The top cover plate is included automatically on the last frame with the inserted honeycomb insert put on and pressed.

By the initial adhesion of the adhesive adheres to the upper cover plate the strip frame and the honeycomb insert with a sufficiently large adhesive force, to subsequently the overall arrangement of upper deck, strip frame and honeycomb insert by means of another (or the same) lifting and transporting device raise and put on a lower cover plate. This is located in a magazine position or in a processing position, in which she was transported from a stack or a magazine.

According to the invention the apparatus for producing the sandwich plate further comprises a press for final pressing of the sandwich panel, it being understood that optionally further means of transport or transport facilities are provided.

By the procedure according to the invention is it thus possible Automatically produce sandwich panels and in particular the handling effort of the individual components - compared with the state of the art - drastically to reduce. For Handling is sufficient, a single lifting and transporting device or to provide a single embodiment of a lifting and transporting device, which raises the upper deck panel. Additional funds to the inguinal frame to handle with the inserted honeycomb inserts are not required.

A particularly advantageous embodiment of the invention is given by in that the lifting and transporting device comprises a vacuum lifting unit. This leads to a damage-free handling the top cover plate. Furthermore, it is possible to different on the system Dimensioning of upper deck panels or sandwich panels manufacture, since such a vacuum lifting unit with a variety of vacuum lifters equipped which can be used accordingly.

through the glueing device according to the invention preferably a PUR adhesive is applied. It is also possible according to the invention PU glue or a hot melt glue to use. The design of the adhesive as well as the adaptation its technical characteristics can be easily adapted to the be adapted to the respective requirements. It is crucial that after the initial one Laying the top cover plate on the provided with the honeycomb inserts Last frame this entire arrangement in a safe manner again can be lifted and placed on the lower cover plate.

through the joining device for producing the last frame of longitudinal bars and cross bars Is it possible, the joining surfaces between the longitudinal bars and glue the crossbars accordingly. It is, however possible, the honeycomb insert facing surfaces of the longitudinal latch and / or the cross bar also to glue, so that the honeycomb insert after insertion into the subject or the subjects better adheres to the last frame and thus during the production of the last frame can be safely positioned.

The Gripping device for inserting the at least one honeycomb insert in the at least one compartment of the last frame is preferred provided with several gripper fingers, each in the honeycomb the honeycomb insert can be inserted. To lift and insert the Honeycomb insert, the gripper fingers are variable in their distance. The honeycomb insert is thus compressed so that they are lower external dimensions and can be inserted into the subject of the last frame, and others by squeezing the Greiferfin like to keep safe. The gripper fingers are there preferably in two dimensions, d. h., in the longitudinal direction and in the transverse direction of the last frame or the previously cut honeycomb insert approachable in their distance.

It is according to the invention thus possible all the needed Honeycomb inserts simultaneously in the appropriate compartments of the Insert last frame. A manual rework or the like is not required, since after removal of the gripper fingers the honeycomb insert again automatically returns to its original dimension. Jamming of edge areas or uneven loading thus separates completely out.

The last frame is preferred during the joining of the longitudinal bars and the crossbars and during insertion of the honeycomb insert on a flat conveyor belt, so that the entire assembly is plane to produce.

It is according to the invention thus possible in a fully automated, continuous manufacturing sandwich panels to manufacture so that virtually no manual operations required are.

in the The invention will be described below on the basis of exemplary embodiments described with the drawing. Showing:

1 a simplified, perspective view of a known from the prior art sandwich panel,

2 to 6 in a simplified representation of the workflows for the production of the sandwich panel according to the invention,

7 a partial perspective sectional view of a structure of a sandwich panel according to the invention, and

8a to 8c a perspective view of the entire system according to the invention.

In the 1 shown sandwich plate comprises an upper cover plate 1 , which is placed on a last frame. This consists of two mutually parallel longitudinal bars 2 and at least two crossbars 3 , Into that from the longitudinal bars 2 and the crossbars 3 formed tray is a honeycomb insert 5 inserted, which consists of paper or cardboard and in plan view, a honeycomb-like structure of preferably hexagonal honeycomb has. With the reference number 4 is a reinforcing insert indicated which additionally z. B. can serve in a door for fitting fittings, door locks or the like.

The 2 to 6 show a simplified representation of the procedure according to the invention and the associated steps:
In 2 a top cover plate is shown, which is liftable by means of a vacuum lifting unit.

The 3 shows a state in which a last frame of Längsriegeln 2 and crossbars 3 was added. It can be seen that a total of three crossbars 3 between the two parallel longitudinal bars 2 are used. In the last frame is a honeycomb insert 5 inserted. The last frame is together with the honeycomb insert 5 glued on its top and on its underside. For example, it rests on disk rollers or the like in order not to impair the glue application on the underside of the strip frame and the honeycomb inserts.

By means of the vacuum lifting unit 7 will, as in 3 shown, the upper deck plate 1 on the last frame and the honeycomb insert 5 put on and slightly pressed.

The 4 clarifies that a lower cover plate 6 is provided at a mounting position. In the 3 Formed arrangement is now using the vacuum lifting unit 7 raised, and, like this in 5 is shown on the bottom cover plate 6 hung up. The gluing of the last frame and the honeycomb insert 5 is sufficient in its adhesive force to after placing and pressing the top cover plate according to 3 Lift the entire assembly and place it on the bottom cover plate 6 to be able to put on.

The following will, as in 6 represented, the entire arrangement fed to a press. This can be a roll press, for example with calender rolls or even a multi-daylight press. In this, the arrangement is pressed accordingly to obtain the finished sandwich panel.

The 7 shows in a perspective partial sectional view of the structure of a sandwich panel according to the invention with a last frame, which longitudinal bar 2 and crossbars, not shown 3 includes. In the last frame is a honeycomb insert 5 inserted, wherein for inserting the above-described, inventive gripping device has been used. Below is the last frame with a top cover plate 1 and a lower cover plate 2 glued. On the upper deck plate 1 Can an upper veneer 11 be applied, the top of the bottom cover plate 6 Can with a bottom veneer 12 be provided.

The longitudinal bars and crossbars can be made of materials such as MDF, solid wood or chipboard. The upper deck plate 1 as well as the lower cover plate 6 can have thicknesses of 5 to 10 mm. On the surfaces (outer surfaces) of the upper cover plate 1 or the lower cover plate 6 can be a top and bottom veneer 11 respectively. 12 be glued. Instead of veneers, other laminating materials (foil, varnish or the like) can also be used. The upper deck plate 1 and the lower cover plate 2 can be made of hardboard, chipboard or HDF. It is understood that the side visible surfaces can also be veneered accordingly or provided with laminating or the like.

The invention is based on a schematic representation of an overall system in conjunction with the 8a to 8c described:
Starting with 8a be first in the station 01.1 longitudinal bars 2 and crossbars 3 supplied and positioned like a ladder. The longitudinal bars 2 are included in a stacking magazine, the crossbar 3 are placed on rotating conveyor belts at a distance to each other. The longitudinal bars 2 have a distance to the crossbars 3 on.

In a station 01.2, the longitudinal bars and crossbars are placed on a conveyor belt 8th transferred. Above the conveyor belt 8th are several stops 9 provided, which are vertically movable and the frontal conditioning of the longitudinal bars 2 as well as for the respective positioning of the crossbars 3 serve. The longitudinal bars 2 and the crossbars 3 are thus stopped and positioned accordingly. When the longitudinal bars 2 and the crossbars 3 have reached their mounting position, the conveyor belt 8th stopped. The joints are glued accordingly (not shown). Subsequently, the strip frame is joined by lateral pressing. The adhesive fixes the longitudinal bars and the cross bars 2 . 3 immediately, so that at the station 01.3 a finished strip frame can be transferred to another conveyor belt.

Simultaneously with the manufacture of the strip frame, the compressed material of the honeycomb insert is drawn from a honeycomb plate stock 02.2 into a honeycomb-expanding dryer 02.1. The previously folded honeycombs are set up and dried by the warm air, so that they are fixed. From the resulting endless honeycomb carpet cuts a cutting device at the end of the honeycomb expanders 02.1 corresponding fixed dimensions of the honeycomb inserts 5 from. These correspond in size to the subjects of the last frame.

The isolated and cut honeycomb inserts 5 are subsequently fed to a station 03.3. There you will be grabbed 10 which are provided with downwardly directed gripper fingers, which in the honeycomb of the honeycomb inserts 5 intervene, raised. The gripper fingers are approximated after insertion into the honeycomb insert so that they compress the honeycomb insert and behave in this way. By transferring them to the grippers 10 hanging honeycomb inserts 5 in the frame they are used in the station 03.1 in the last frame. The insertion takes place on a flat conveyor belt, so that the flatness is guaranteed.

following is the last frame with the inserted honeycomb inserts on a Angular roller conveyor 04.0 transferred. in this connection there is an exact positioning of the last frame.

Of the Last frame is subsequently in the station 05.0 at its top and provided with adhesive on its underside. This is done by upper and lower rollers by means of which the adhesive is applied.

Of the glued edging frame is subsequently on a cone roller conveyor transported to by means of conically shaped transport rollers only a small contact surface to have the glue applied to the bottom of the ledge frame not impaired becomes.

In a station is 06.1, for example by means of the illustrated Forklift, a stack of upper deck plates or lower deck plates provided. The stack is transferred to a station 06.2. through a vacuum lifting unit is in station 06.3 each an upper deck plate or lower cover plate lifted and transferred to a station 06.4. Of this from is by means of a vacuum lifting unit 06.8, which on a Portal is stored, an upper deck plate placed on the station 06.5, while one Bottom plate is transferred to the station 06.7. From the station 06.5 Now the vacuum lifting unit picks up the top cover plate and places these on the glued last frame. After a short press lifts the vacuum lifting unit the upper deck plate together with the last frame and places them in station 06.7 on the lower cover plate. Thus, the sandwich panel is completely assembled.

In Station 07.0 and 07.8 the sandwich plate is transported further and calender roller presses 09.1 and 09.2 supplied. This is a fixed Composite to the finished sandwich panel. This leaves the Calender roller presses 09.1 and 09.2 and is placed on a transport station 10.0 transferred. From this is done from a stacking in the stations 11.2 and 11.3, this is done by means of vacuum lifting units of the station 11.1.

It It is understood that before or after stacking in the stations 11.1 to 11.3 trimming the edges or dividing the sandwich panels can be done in smaller single sandwich panels.

1

Upper deck plate

2

longitudinal bars

3

crossbars

4

reinforcing insert

5

honeycomb insert

6

Under cover plate

7

Vacuum lifting unit

8th

conveyor belt

9

attack

10

grab

Claims (13)

Sandwich panel manufacturing apparatus comprising the following components: - a joining device for a strip frame made of longitudinal bars ( 2 ) and crossbars ( 3 ), - a gripping device for gripping, transporting and inserting at least one honeycomb insert ( 5 ) in at least one compartment of the last frame, wherein the gripping device is provided with gripper fingers, each in honeycomb of the honeycomb insert ( 5 ) and can be changed in their distance, - a gluing device for gluing the top and bottom of the last frame and the honeycomb insert ( 5 ), - a lifting and transporting device for lifting and transporting a top cover plate ( 1 ) from a magazine position to the last frame and the honeycomb insert ( 5 ) and for placing and pressing on the last frame and the honeycomb insert ( 5 ), wherein the lifting and transport device at least one vacuum lifting unit ( 7 ), - a lifting and transporting device for lifting and transporting the arrangement of strip frame, honeycomb insert ( 5 ) and upper deck plate ( 1 ) to a magazine position with a lower cover plate ( 6 ), and - a press for finishing the sandwich plate. Device according to claim 1, characterized in that that a PUR adhesive is applied by means of the gluing device. Device according to claim 1, characterized in that in that a PU adhesive is applied by means of the gluing device. Device according to claim 1, characterized in that in that a hot-melt adhesive is applied by means of the gluing device becomes. Device according to one of claims 1 to 4, characterized in that by means of the gluing device of the honeycomb insert ( 5 ) facing surfaces of the longitudinal latch ( 2 ) and / or crossbars ( 3 ) are providable with adhesive. Sandwich panel production method with the following working steps: - producing a strip frame by joining longitudinal bars ( 2 ) and crossbars ( 3 ), - insertion of at least one honeycomb insert ( 5 ) in at least one of the longitudinal bars ( 2 ) and the crossbars ( 3 ) formed compartment, - gluing the tops and bottoms of the last frame and the honeycomb insert ( 5 ), - transporting a top cover plate ( 1 ) from a magazine position to the last frame by means of a vacuum lifting unit ( 7 ), - placing and pressing an upper cover plate ( 1 ), - lifting and transporting the upper deck plate ( 1 ) together with the last frame and the honeycomb insert ( 5 ) by means of the vacuum lifting unit ( 7 ) to a joining position, to which previously a lower cover plate ( 6 ) was transported. - placing the arrangement on the lower cover plate ( 6 ) to form a sandwich panel, and - pressing the sandwich panel. A method according to claim 6, characterized in that the sandwich panel by means of a vacuum lifting unit ( 7 ) is transported to the press. Method according to one of claims 6 or 7, characterized that a PUR adhesive is used for gluing. Method according to one of claims 6 or 7, characterized that a PU adhesive is used for gluing. Method according to one of claims 6 or 7, characterized that for gluing a hot melt adhesive is used. Method according to one of claims 6 to 10, characterized in that by means of the gluing device that of the honeycomb insert ( 5 ) facing surfaces of the longitudinal latch ( 2 ) and / or the crossbar ( 3 ) are provided with adhesive. Method according to one of claims 6 to 11, characterized in that all required honeycomb inserts ( 5 ) are inserted simultaneously. Method according to one of claims 6 to 12, characterized that the procedure is carried out automatically.