TRANSPORT ARRANGEMENT FOR WOOD FIBRE BOARDS AND METHOD FOR TRANSPORTING WOOD FIBRE BOARDS

Description

[0001] The invention relates to a transport arrangement for wood fiber boards with at least one first transport device for the horizontal transport of wood fiber boards.

[0002] The invention further relates to a method for transporting wood fiber boards, wherein the wood fiber boards are transported lying on at least one first transport device.

[0003] Examples of wood-based panels include chipboard, OSB boards, lightweight boards, multi-layer boards, HDF or MDF boards.

[0004] The transport device is primarily understood to mean circulating conveyor belts, several of which can run parallel to one another, but driven transport rollers or rail transport are also not excluded within the scope of this invention.

[0005] Wood fiberboards are typically manufactured by spreading a spreadable material (essentially glued wood chips) onto a conveyor belt to form a wood-based material mat. These wood-based material mats can range in thickness from a few millimeters to one meter. Today, the spreading stations are capable of varying the spreading quantity both in the conveying direction of the conveyor belt and in the transverse direction using one or more series-connected, adjustable-dosage spreading stations. Several series-connected spreading stations enable the formation of different layers, such as top and middle layers. The conveyor belt conveys the wood-based material mat to a press. This press, which applies pressure and heat to the wood-based material mat fed along the conveyor belt in one conveying direction, is usually a double-belt press. The finished product is a board strand that is sawn into wood-based material panels.

[0006] These wood-based panels are often fed to further processing or treatment stations. For example, they can be measured, sorted, sanded, cooled, dried, or sealed. These processes often require a certain amount of time, making a continuous, even feed impossible.

[0007] Or rectangular panels are deflected at right angles during transport, so that the edge running in the direction of transport suddenly becomes shorter or longer.

[0008] To solve these problems, the state of the art recognizes the processes of stack formation and stack transport, as well as the "shingling" or "descaling" of the wood fiberboards, which means transporting them with at least partially overlapping wood fiberboards or transporting them individually while keeping the wood fiberboards at a distance. Utility models DE202006018443U1 and DE202007001451U1 are cited in this context. These publications aim to limit excessive stress on the wood fiberboards during the formation of stacks or shingles, as well as excessive and damaging friction between the wood boards during the disintegration of the shingles.

[0009] However, this is only partially achieved. For flaking, a fiberboard falls from a higher conveyor belt onto a lower conveyor belt, and for stacking, the fiberboards are pushed onto one another. And descaling is also impossible without friction, which could potentially scratch the fiberboard.

[0010] Furthermore, DE 10 2005 0054 78 A1 describes a collecting device for plate-shaped objects at the end of a transport line. This transport line is designed as a double-belt conveyor. The supplied plates are to be stacked in the collecting device. For this purpose, a conveyor is provided between the transport line and the collecting device. This conveyor is lowered relative to the transport line and operates at a reduced speed, so that the plates falling onto the conveyor from above run over one another in a shingled pattern.

[0011] Another embodiment of a transport device for stacking cardboard sheets for cardboard packaging is known from CN 106915649 A. This comprises two transport devices arranged one behind the other, between which a lifting device is provided to separate individual sheets from one another. CN 106915649 A discloses a transport arrangement according to the preamble of claim 1.

[0012] The object of the invention is to reduce the stress on the wood fiber boards during transport compared to the prior art and still be able to switch to a changing transport speed.

[0013] The object of the invention is to reduce the stress on the wood fiber boards during transport compared to the prior art and still be able to switch to a changing transport speed.

[0014] The object is achieved with regard to the transport arrangement for wood fiber boards by the features of claim 1. A lifting device for a wood fiber board and an acceleration or braking device, functionally coupled to the lifting device, for the lifted wood fiber board or the wood fiber board transported immediately in front of it for producing or dissolving partially superimposed wood fiber boards are provided.

[0015] By using a fiberboard with a lifting device to create or break up the shingles, friction is eliminated between two fiberboards that are at least partially overlapping. The fiberboards are treated much more gently during this process. Furthermore, the positioning accuracy of the fiberboards on the transport devices is improved.

[0016] According to the invention, the lifting device is formed by rollers whose height is adjustable.

[0017] This also largely eliminates any potential friction with the lifting device. Transport can continue while lifting.

[0018] According to the invention, the rollers have a drive.

[0019] This allows a raised fiberboard to be moved over the fiberboard in front, with the raised board being transported slightly faster than before on the rollers. This should create a speed difference between the raised fiberboard and the fiberboard transported in front of it in the direction of travel. The fiberboard can then be carefully lowered so that no friction occurs between the fiberboards. Conversely, a fiberboard already partially resting on another board can be lifted, and the fiberboard below it can be moved further along the conveyor, which leads to the elimination of the shingles.

[0020] According to the invention, the braking or acceleration device is formed by a second transport device.

[0021] It is easy to operate a conveyor belt as the first transport device at a speed v 1. A second following conveyor belt as the second transport device is operated at a lower speed v 2 < v 1 during shingling. The installed lifting device lifts the wood fiber board, which is still being transported at speed v 1, and in this way a rear wood fiber board is transported over the front one in the running direction, which is being transported on the second transport device at speed v 2.

[0022] The slower speed of the overlapping wood fiber boards of the second transport device offers the great advantage that the wood fiber boards can cool down significantly better and as desired over the same transport length, for example to a final stacking system.

[0023] Advantageously, it can also be provided that the transport heights of the first and second transport devices are identical.

[0024] As a result, a wood fiber board does not fall from a higher transport device to a transport device at a lower level at the risk of damage, as is the case in the prior art.

[0025] According to the invention, the lifting device is installed between the first and the second transport device.

[0026] There is sufficient space here to install, for example, one or more height-adjustable rollers. The uppermost point of a roller remains at the height of the transport device when no shingling or descaling is required. However, it can also be conveniently raised the moment a fiberboard reaches a lifting position. Generally, there is sufficient space to install a lifting device with a ramp function, which further facilitates the gentle handling of the fiberboards. A short, pivoting conveyor belt can be used here, or several rollers can be arranged one behind the other, each successively increasing in absolute height.

[0027] It is particularly advantageous if a control or regulating device is provided with which the acceleration or deceleration can be adjusted depending on the transport speed and / or the length of the wood fibre boards.

[0028] If the cut fiberboard is not only stacked after the continuous press but also undergoes further processing steps, such as measurement, sufficient clearance must be created between the boards to allow for the measurement, for example. The shorter the cut fiberboard is in its transport direction at a constant production speed in the continuous press, the greater the acceleration required to increase the distance between the boards. For example, if the press operates at a speed of 2 m / s and the measuring device requires 0.25 seconds, the speed of a 2-meter-long fiberboard must be increased by 25%, while the speed of a 4-meter-long fiberboard only needs to be increased by 12.5%.

[0029] Considering these complex relationships, it is advantageous if the transport speed of the first and second transport devices can be adjusted by the control or regulating device.

[0030] Even if new shingles are formed after a treatment step for the wood fibre board, it is useful for the control system to regulate the speeds of the first and second transport device and, if necessary, the drive of the rollers.

[0031] In the event that the acceleration of the wood fibre board becomes too great, especially in the case of very light and large boards, it is advantageous if a pressure element is provided on the side of the wood fibre board opposite the lifting device.

[0032] The object of the invention is achieved with regard to the method for transporting wood fiber boards by the features of claim 6. It is provided that a wood fiber board is lifted in a lifting position on or after the first transport device, and a speed difference is set between the respectively lifted wood fiber board and the wood fiber board transported immediately in front of it in the transport direction, so that an overlap of the wood fiber boards or a resolution of an already existing overlap occurs.

[0033] The resulting advantages are already explained in the description of the device claims.

[0034] Analogously, it is also advantageous if procedurally a wood fibre board is lifted in the lifting position by height-adjustable rollers during overlapping transport, and / or a second transport device brakes or accelerates the lifted wood fibre board or the wood fibre board transported immediately in front of it, whereby in a special embodiment the speed difference is adjusted based on a length measurement and / or the transport speed of the wood fibre board

[0035] The invention is explained in more detail below with reference to the drawings. All three figures show a schematic, partially sectioned representation of the transport arrangement according to the invention.

[0036] Show Fig. 1 and Fig. 2 two temporally offset states of a first embodiment and Fig. 3 a transport arrangement supplemented by several features.

[0037] Fig. 1 shows a transport arrangement 1 with a first transport device 2 and a second transport device 3. In this embodiment, both transport devices are formed by one or more conveyor belts 4 which rotate around usually driven deflection rollers 5.

[0038] Wood fiberboards 10.1, 10.2, 10.3 are transported on the transport devices 2, 3 with a length that bears the reference number 16 here. At the time shown, all wood fiberboards 10.1, 10.2, 10.3 are spaced apart from one another. For example, wood fiberboard 10.1 is transported by the first transport device 2 and wood fiberboard 10.3 by the second transport device 3. Wood fiberboard 10.2 is located exactly in the transition area between the first transport device 2 and the second transport device 3. All wood fiberboards 10.1, 10.2, 10.3 are moved at the same transport height 15. The individual wood fiberboards 10.1, 10.2, 10.3 maintain a constant distance from one another because both transport devices 2, 3 are operated at the same speed 6, 7. The speed v 1 of the first conveyor belt is shown by arrow 6, the speed v 2 of the second conveyor belt is shown by arrow 7.

[0039] During the transport of spaced-apart wood fiber boards 10.1, 10.2, 10.3, a height-adjustable roller 11.1 is located between the first transport device 2 and the second transport device 3 at a height at which a wood fiber board 10.1, 10.2, 10.3 is transported lying on top at the same transport height as in the transport devices 2, 3.

[0040] If, for example, it is necessary to transport the boards more slowly on their way to the next destination station to ensure better cooling, the wood fiber boards 10.1, 10.2, 10.3 are "shingled".

[0041] This process is particularly evident in the Fig. 2 shown. According to the invention, the partial superimposition of the wood fiber boards 10.1, 10.2, 10.3 should take place as far as possible without friction among the boards, largely without friction between the boards and the transport device, and without the boards falling from a higher to a lower transport level.

[0042] This shows Fig. 2 , how at the right moment the roller 11.1 as lifting device 8 in the lifting position 18 lifts a wood fiber board (in this illustration the one with the reference number 10.2). Since the speeds of the transport devices 2, 3 are different, namely v 2 < v 1 , the board is mitered over the one transported in front of it in the direction of travel and then carefully placed on top. The overlap can be 5 to 100% depending on the speed difference (v 2 to v 1 ). This is achieved by an acceleration / braking device 9, which in this embodiment is also formed by the second transport device. The wood fiber boards 10.1, 10.2, 10.3 are accordingly transported on the second transport device more slowly, as desired, than, for example, at the exit and after cross-cutting to form boards after the continuous press. This creates a better cooling opportunity.

[0043] Fig. 3illustrates some variations and additional possibilities that the invention offers.

[0044] For example, the lifting device uses several rollers (11.1, 11.2, and 11.3) that can be adjusted to resemble a ramp in the direction of travel of the wood fiberboards. This ramp could also be implemented using a short conveyor belt.

[0045] To ensure that a wood fibre board (here 10.2) does not lose contact, especially at higher speeds, a pressure element 12, also in the form of a roller, is used, which acts on the side of the wood fibre board opposite the rollers 11.1, 11.2, 11.3.

[0046] In addition, a control or regulating device 14 is provided, with which the acceleration or deceleration can be adjusted depending on the transport speed and / or the length 16 of the wood fiber boards 10.1, 10.2, 10.3. Various control lines are shown as examples in dash-dotted lines, which, viewed from top to bottom, are the speed v2 of the second transport device 3 the braking or acceleration device 9 the pressure or the drive of the pressure element 12 the drive of the lifting device or its rollers 11.1, 11.2, 11.3 the speed v1 of the first transport device 2 act or capture values. Reference symbols:

[0047] 1Transport arrangement 2First transport device 3Second transport device 4Conveyor belt 5Deflection rollers 6Speed of the first conveyor belt v1 7Speed of the second conveyor belt v2 8Lifting device 9Acceleration / braking device 10.1, 10.2, 10.3Wood fiberboard 11.1, 11.2, 11.3Roller 12Pressure element 13Pressure roller 14Control or regulating device 15Transport height 16Panel length 17Control lines 18Lifting position

Claims

1. Transporting arrangement for wood fibre boards (10.1, 10.2, 10.3) with at least - a first transporting device (2) for the horizontal transportation of wood fibre boards (10.1, 10.2, 10.3), - a lifting device (8) for a wood fibre board (10.1, 10.2, 10.3) and, - functionally connected to the lifting device (8), an acceleration or braking device (9) for the lifted wood fibre board (10.2) or the wood fibre board (10.3) being transported immediately in front of it in order to produce or undo partially overlapping wood fibre boards, wherein the braking or acceleration device (9) is formed by a second transporting device (3), wherein the lifting device (8) is installed between the first transporting device (2) and the second transporting device (3), and characterised in that the lifting device (8) is formed by height-adjustable rollers (11.1, 11.2, 11.3), and in that the rollers (11.1, 11.2, 11.3) have a drive.

2. Transporting arrangement according to claim 1, characterised in that the transporting heights (15) of the first transporting device (2) and of the second transporting device (3) are identical.

3. Transporting arrangement according to claim 1 or 2, characterised in that a control or regulating device (14) is provided with which, as a function of the transporting speed (6, 7) and / or the length (16) of the wood fibre boards (10.1, 10.2, 10.3), the acceleration or the braking can be adjusted.

4. Transporting arrangement according to claim 3, characterised in that the transporting speed (6, 7) of the first transporting device (2) and or the second transporting device (3) is adjustable by way of the control or regulating device (14).

5. Transporting arrangement according to claims 1 to 4, characterised in that a press-on element (12) is provided on the side of the wood fibre board (10.1, 10.2, 10.3) opposite the lifting device (8).

6. Method of transporting wood fibre boards (10.1, 10.2, 10.3) wherein the wood fibre boards (10.1, 10.2, 10.3) are transported horizontally on a transporting arrangement, wherein the transporting arrangement comprises - a first transporting device (2) for the horizontal transportation of wood fibre boards (10.1, 10.2, 10.3), - a lifting device (8) for a wood fibre board (10.1, 10.2, 10.3) and, - functionally connected to the lifting device (8), an acceleration or braking device (9) for the lifted wood fibre board (10.2) or the wood fibre board (10.3) being transported immediately in front of it in order to produce or undo partially overlapping wood fibre boards, wherein the braking or acceleration device (9) is formed by a second transporting device (3), wherein the lifting device (8) is installed between the first transporting device (2) and the second transporting device (3), wherein the lifting device (8) is formed by height-adjustable rollers (11.1, 11.2, 11.3), wherein the rollers (11.1, 11.2, 11.3) have a drive, wherein in a lifting position (18), a wood fibre board (10.2) is lifted at or after the first transporting device (2), and between the respective lifted wood fibre board (10.2) and the wood fibre board (10.3) being transported immediately in front it, a speed difference is set, so that overlapping of the wood fibre board or undoing of already existing overlapping takes place.

7. Method according to claim 6, characterised in that during overlapping transporting, a wood fibre board (10.1, 10.2, 10.3) is lifted in the lifting position (18) by height-adjustable rollers (11.1, 11.2, 11.3).

8. Method according to any one of claims 6 or 7, characterised in that a second transporting device (3) brakes or accelerates the lifted wood fibre board (10.2) or the wood fibre board (10.3) being transported immediately in front of it.

9. Method according to any one of claims 6 to 8, characterised in that the speed difference is set on the basis of a longitudinal dimension and / or the transporting speed of the wood fibre board (10.1, 10.2, 10.3).

10. Method according to claim 9, characterised in that the setting takes place on the basis of data stored in a control and as a function of transporting speeds and board length.

11. Method according to claim 6, characterised in that during the transporting of non-overlapping wood fibre boards (10.1, 10.2, 10.3), the contact area or line of a lifting device (8) with the wood fibre board (10.1, 10.2, 10.3) is set at around the same height level (15) as the first transporting device (2).