DE29921285U1 - Device for transporting board lamellas in a plywood pressing device - Google Patents

Description

Device for transporting board lamellas into a laminated wood pressing device

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The invention relates to a transport device with which board lamellas can be fed to a laminated wood pressing device.

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Curved or straight glued wood beams are manufactured in a laminated wood press. These beams are generally solid-walled and are manufactured by gluing board slats of the same width together. Glue is used as a connecting material for the board slats. The use of glued wood beams is very interesting from an economic point of view, as they are fire-retardant without any special proof from a minimum thickness of 12 cm (centimetres).

STATE OF THE ART

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It is known to stack the board lamellas required for a glued wood beam in a stacking system in the required number and to feed the resulting wood glue stack lengthwise into the laminated wood pressing device. The stacking system is preceded by a gluing station arranged lengthwise of the board lamellas, through which the wooden boards are guided lengthwise and thus receive a glue application on one side. For these three work stations arranged lengthwise of the board lamellas, the gluing station, the stacking system and the laminated wood pressing device, a processing system is required that

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must be at least three times the length of the respective glued timber beam. If a glued timber beam is 50 m (meters) long, this results in a length of at least 150 m for the corresponding processing system.

US-A 4,141,775 discloses a processing system in which the individual board slats are fed to the laminated wood press device not in the longitudinal direction but transversely to their longitudinal extent. This allows the maximum required longitudinal extent of the processing system to be significantly reduced. This processing system has a telescopic conveyor system for transferring board slats, which is positioned between a roller table and a laminated wood press device inclined at an angle of approximately 3 5° (degrees). The roller table is arranged at a parallel distance to the laminated wood press device. The board slats, which are transported one after the other on the roller table, are placed transversely on the telescopic conveyor system and then transported by the conveyor system into the area of the inclined laminated wood press device. The height and longitudinal extent of the telescopic conveyor system must be adjusted according to the respective position of the board slat to be stored in the laminated wood press device. The adjustment is carried out by an operator who switches the corresponding motor drives.

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DESCRIPTION OF THE INVENTION

Based on this previously known state of the art, the invention is based on the object of providing an economically most favorable possibility by means of which board lamellas can be fed to a laminated wood pressing device.

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This invention is defined by the independent claims 1 and 5. Further developments of the invention are the subject of subclaims.

The device according to the invention according to claim 1 is based on a laminated wood pressing device, one side wall of which can be practically pivoted down almost horizontally. By means of a telescopic conveyor system arranged approximately parallel to the support plane of this side wall, it can then be achieved that when feeding board slats into the area of the laminated wood pressing device, i.e. onto the side wall or the loading beams of which the side wall can consist, the same only needs to be adjusted parallel to this side wall. In contrast to the prior art, where a two-sided adjustment of the front end of the telescopic conveyor system is necessary in order to position board slats in the correct place on the inclined laminated wood pressing device, here a linear longitudinal adjustment in the telescopic direction is sufficient. This enables a telescopic conveyor system to be operated more quickly and overall more simply than in the prior art. This has a direct positive influence on the economic efficiency in connection with loading a laminated wood pressing device with board slats.

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The adjustment of the telescopic conveyor system in the telescopic direction can be carried out by means of a piston rod, which can be extended from a working cylinder attached to the free end of the telescopic conveyor system to a certain extent depending on the thickness of the individual board slats. The piston rod can then be attached to the floor or to the abutment of the loading beams of the side wall or to the top board slat of the

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Plywood pressing device presses off the existing stack of board slats that are already stacked on top of each other and thereby moves the telescopic conveyor system back accordingly in order to make room for the next board slat to be fed in.

The piston rod can be adjusted manually or automatically. The automatic adjustment, which further increases efficiency, can be carried out using a switching element that can be brought into switching contact with a board slat transported along the telescopic conveyor system and which then triggers the extension movement of the piston rod.

The device according to the invention according to claim 5 is based on a generally known plywood pressing device which can be fed with board slats by means of a telescopic conveyor system with an adjustable inclination, as is known in the prior art mentioned at the beginning.

To increase efficiency, a control device can be provided in such a device positioned between the laminated wood pressing device and a roller table for transferring board slats into the laminated wood pressing device, by means of which the front end of the telescopic conveyor system can be automatically adjusted both in the telescoping direction and in height. The control device has a switching element that can be brought into switching contact with a board slat transported along the telescopic conveyor system. This means that the operator required in the prior art can be eliminated and the adjustment of the front end of the telescopic conveyor system in the telescoping direction and in height required can be automatically effected or triggered by the board slat transported by the telescopic conveyor system.

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In an embodiment of a device according to the invention, which is also shown in the drawing, the telescopic conveyor system has a fixed boom arm that can pivot about a vertical axis and a telescopic arm that is held along the boom arm and can be telescoped. Both the boom arm and the telescopic arm each have an endlessly rotating link chain for transporting board slats. A drive transmission means is provided between the two link chains in order to drive the two link chains together and evenly.

In subclaim 12, special features are specified in order to achieve in a simple manner that, when the two link chains are continuously rotating, the telescopic arm can be adjusted longitudinally relative to the boom arm.

Further embodiments and advantages of the invention can be taken from the features further listed in the claims and from the following exemplary embodiment.

SHORT DESCRIPTION OF THE DRAWING

The invention is described and explained in more detail below with reference to the embodiment shown in the drawing.

Fig. 1 is a side view of a device according to the invention when feeding a board lamella onto a board lamella stack already present in the pressing device,

Fig. 2 is a view similar to Fig. 1, in the initial stage of loading the laminated wood press with board lamellas,

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Fig. 3 is a plan view of the device according to Fig. 2, Fig. 4 is a section through the telescopic conveyor system and

Fig. 5 is a perspective schematic drawing of the link chains connected to each other on the boom arm and telescopic arm in a rotationally fixed manner.

WAYS TO CARRY OUT THE INVENTION

The device 10 shown in Fig. 1 serves to transfer board lamellas 14 transported on a roller table 12 into the area of a laminated wood pressing device 16. In the laminated wood pressing device 16, straight or curved glued wood beams can be produced in the longitudinal direction.

The pressing device 16 has a substructure 18 with which it is supported on a floor 2 0. A rear vertical frame 22 and a front frame 24 are attached to the substructure 18. The front frame 24, which has loading beams 2 6, can be pivoted about a pivot shaft 28 on the substructure 18 from its vertical orientation indicated by dashed lines into an almost horizontal position shown in solid lines in Fig. 1. In this horizontal position, board slats 14 are stacked on their loading beams 26 by means of the device 10. When the stacking process is finished, in the present case the two board slat stacks 32, 34 separated from one another by bars 3 0 are pivoted up together with the loading beam 26, pressed together from above by means of a pressing cylinder 3 6 and the glue layers between the individual board slats are firmly connected to the board slats.

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The device 10 has a cantilever arm 40 which is supported by a bearing plate 42 on a vertically aligned bearing wall 44 by means of a horizontally arranged pivot shaft 46. The bearing wall 44 can in turn be pivoted about a vertical pivot axis 52 via a bracket structure 48, 50. In the present case, the bracket structure 48, 50 is attached to the roller table 12. However, it is also possible to attach the bracket structure 48, 50 to a building wall or to another foundation-like structure.

Between the boom arm 40 and the bearing wall 44, a working cylinder 53 with a rear end 54 is articulated to the bearing wall 44. Its piston rod 56 is articulated to the point 58 on the underside of the boom arm 40. By extending or retracting the piston rod 56, the boom arm 40 can be adjusted in terms of inclination about the pivot shaft 46.

A telescopic arm 60 is attached to the boom arm parallel to the boom arm 40. For this purpose, an upper and a lower guide bracket 62, 64 are attached to the boom arm 40, in each of which a guide rod 66, 68 is held so that it can be moved longitudinally. The guide rods 66, 68 carry guide brackets 70, 72 attached to the telescopic arm 60. In this way, the telescopic arm 60 can be adjusted back and forth in its telescoping direction 74 relative to the boom arm 40 by means of the guide rods 66, 68.

The boom arm 40 consists of a rectangular hollow profile 76. The upper run of a link chain 80 runs along its upper side 7 8. The lower run of this link chain 80 runs within the hollow profile 76. At the front and rear end of the boom arm 40 there is a front and rear

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Deflection roller 82, 84 for the link chain 80 is present. In the present example, the rear deflection roller 84 is driven by an electric motor drive 86 and the link chain 80 is thereby moved in the direction of the arrow 88 (Fig. 5). The front deflection roller 82 also rotates at the same time as the rear deflection roller 84.

In the front area of the boom arm 40, a gear klklj meshes only with the upper run 80.1 of the link chain 80. This gear 90 rotates depending on the transport speed of the link chain 80.

The telescopic arm 60 also has an endlessly rotating link chain 92, which rotates around deflection rollers 94, 96 arranged at both ends of the telescopic arm 60. Opposite the gear 90, a gear 95 is arranged on the telescopic arm 60, which meshes with the lower run 92.2 of the link chain 92. The two gears 90, 95 are connected to one another in a rotationally fixed manner via a shaft 99. By driving the rear deflection roller 84 of the link chain 80, the link chain 92 of the telescopic arm 60 is also driven in the direction of the arrow 98 via the gears 90, 95.

While the gear 90 could be in meshing engagement not only with the upper run 80.1 but also simultaneously or alternatively with the lower run 80.2 of the link chain 80, this is not the case with the gear 95. Since the gear 95 is only in mesh with the lower run 92.2 of the link chain 92, the telescopic arm 60 with its two deflection rollers 94, 96 and the entire link chain 92 can be pushed back and forth in the telescoping direction (double arrow 100), while the link chain 92 is running. Instead of with the lower run 92.2, the

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Gear 95 may only be in meshing engagement with the upper run 92.1.

The adjustment of the telescopic arm 60 to the right - in relation to Fig. 5 - is carried out by means of a working cylinder 104 attached to the front end 102 of the telescopic arm 60. The piston rod 106 of this working cylinder 104 can be pushed out of the working cylinder 104 a little by operating a rocker arm 108, which represents a switching element. A support plate 110 is attached to the front end of the piston rod 106. With this support plate 110, the piston rod 106 and thus the working cylinder 104 are supported, for example, on the board lamella 14.4 already stored in the pressing device 16, provided that such a board lamella is already present in the pressing device 16. Before a first board lamella 14.4 is present, the support plate 110 is supported on the abutment plate 112 (Fig. 1) of the loading beam 26 or the front 0 that has been swung down. Frame 24.

The extension movement of the piston rod 106 corresponds to the thickness 114 of the respective board slats 14. This ensures that there is always a constant large free space between the front board slat 14.4 or between the abutment plate 112 and the front end of the link chain 92 of the telescopic arm 60, into which the next of the board slats 14.3 to be stored (Fig. 1) can fall. The free space is matched to the thickness 0 114 of the board slats, in such a way that the board slat 14.3 lies flat on the stack 32, for example.

In the illustration according to Fig. 1, the piston rod 106 - relative to the last laid board lamella 14.4 - is in

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its retracted position, while in the illustration according to Fig. 2 - again related to the board slat 14.4 - it is in its extended position, in which it (106) supports itself on the board slat 14.4 after the latter has fallen from the link chain 92 onto the loading beam 2 and has returned the telescopic arm 60 to its position shown in Fig. 1 - related to the last board slat 14.4 deposited.

The extension movement of the piston rod 106 is triggered, as already explained, by pressing down the rocker arm 108 by a board slat 14 moving over the rocker arm 108. The time interval that the board slat 14 needs to get from the position above the rocker arm 108 to the front end of the link chain 92 and to fall from the link chain 92 onto the loading beam 26 is taken into account. Only then can the piston rod 106 be extended and the telescopic arm 60 be moved back a little.

Of the two board slat stacks 32, 34, the lower stack 34 is produced first, as is indicated in Fig. 2. During stacking and thus during production of the stack 34, the telescopic arm 60 is simply moved back in its telescoping direction 74 (Fig. 2) piece by piece, in accordance with the thickness 114 of the board slats 14. After the stack 34 has been produced, the telescopic arm 60 is pivoted upwards and bars 30 are placed on the stack 34 as spacers. The upper stack 32 in Fig. 1 is then stacked on these bars 30, as can also be seen functionally in Fig. 2, for example.

In the present example, the telescopic arm does not have a parallel alignment to the lower stack 34 and the upper stack 32 at the same time, since it is pivoted around the pivot shaft -H-

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46 is only adjustable in its inclination. Due to the length of the telescopic arm in relation to the small thickness and number of stacks 34, 32, the resulting non-exactly parallel alignment of the telescopic arm 60 is acceptable. If extremely wide board slats and a correspondingly large number of such stacks are to be processed simultaneously in a pressing device 16, it could be considered to arrange the entire device so that it can be adjusted in height in parallel as an alternative or in addition to its inclination adjustability. The device 10 with its extension arm and its telescopic arm could also be arranged freely hanging at the desired distance next to a plywood pressing device. In addition, the device could also be designed to be movable in space.

Claims (12)

1. Device for transferring board lamellas ( 14 ) from a roller conveyor ( 12 ) to swung-down loading beams ( 26 ) of the side wall of a laminated wood pressing device ( 16 ), characterized in that 1. a telescopic conveyor system ( 10 ) can be positioned between the roller table ( 12 ) and the loading beams ( 26 ) in such a way that 2. the telescoping direction ( 74 ) is approximately parallel to the support plane of the loading beams ( 26 ). 2. Device according to claim 1, characterized in that 1. a working cylinder ( 104 ) with a piston rod ( 106 ) is attached to the front end ( 102 ) of the telescopic conveyor system ( 10 ), 2. the piston rod ( 106 ) can be extended and/or retracted in the direction of the longitudinal adjustability of the telescopic conveyor system ( 10 ). 3. Device according to claim 2, characterized in that 1. a switching element ( 108 ) for triggering the extension movement of the piston rod ( 106 ) out of the working cylinder ( 104 ) is provided in such a way that the switching element ( 108 ) can be brought into switching contact with a board slat ( 14 ) transported along the telescopic conveyor system ( 10 ). 4. Device according to claim 3, characterized in that 1. the telescopic conveyor system ( 10 ) has a continuously rotating conveyor ( 80 , 92 ) for transporting the board slats ( 14 ), 2. the front end of the transport means ( 92 ) present on the telescopic conveyor system ( 10 ) can be positioned in front of the end abutment ( 112 ) of the bearing beam ( 26 ) or in front of the board slat ( 14.4 ) which lies on top of the abutment plate ( 112 ) by the piston rod ( 110 ) which is extended out of the working cylinder ( 104 ) by means of the switching element ( 108 ) in such a way that a board slat ( 14.3 ) falling off the conveyor means ( 92 ) can be positioned lying flat on the abutment ( 112 ) or lying flat on the top board slat ( 14.4 ) of the board slats stacked flat on top of one another on the abutment ( 112 ). 5. Device for transferring board lamellas ( 14 ) from a roller table ( 12 ) into a laminated wood pressing device ( 16 ), 1. with a telescopic conveyor system with adjustable inclination between the roller table and the laminated wood pressing device, characterized in that 2. a control device for automatically adjusting the front end of the telescopic conveyor system in the telescoping direction and in height is provided so that 3. a board slat falling off the front of the telescopic conveyor system can be positioned lying flat on the floor of the laminated wood pressing device or lying flat on the top board slat of the stack of board slats stacked on top of each other in the laminated wood pressing device, 4. the control device has a switching element which can be brought into switching contact with a board slat transported along the telescopic conveyor system. 6. Device according to one of the preceding claims, characterized in that 1. the front end of the telescopic conveyor system ( 10 ) is height adjustable. 7. Device according to one of the preceding claims, characterized in that 1. the support structure for the telescopic conveyor system ( 10 ) has a pivot bearing formation ( 46 ) for the telescopic conveyor system ( 10 ). 8. Device according to claim 6 or 7, characterized in that 1. a working cylinder ( 53 ) with an extendable and/or retractable piston rod ( 56 ) is provided for adjusting the inclination of the telescopic conveyor system ( 10 ). 9. Device according to one of the preceding claims, characterized in that 1. the telescopic conveyor system ( 10 ) has at least one boom arm ( 40 ) with at least one telescopic arm ( 60 ) adjustable along the boom arm ( 40 ). 10. Device according to claim 9, characterized in that 1. a first endless link chain ( 80 ) is provided on the boom arm ( 40 ) and a second endless link chain ( 92 ) is provided on the telescopic arm ( 60 ). 11. Device according to claim 10, characterized in that 1. a drive transmission means ( 89 ) is present between the two link chains. 12. Device according to claim 11, characterized in that 1. a first gear ( 90 ) is in meshing engagement with at least one strand ( 80.1 , 80.2 ) of the first link chain ( 80 ), 2. a second gear ( 95 ) is in meshing engagement with a strand ( 92.2 ) of the second link chain ( 92 ), 3. both gears ( 90 , 95 ) are held stationary on the boom arm ( 40 ), 4. both gears ( 90 , 95 ) are connected to each other in a rotationally fixed manner.