DE102017009823B3 - Continuous press for pressing pressed material mats - Google Patents

Abstract

The invention relates to a continuous press for pressing pressed material mats (1) into pressed product slabs in the course of the production of wood-based panels,
with press bottom part (4) and upper press part (2), in the lower press part (4) and upper press part (2) endlessly circulating press belts (6), between which the pressed material mat (1) is compressible, wherein
- In the press base (4) and / or in the press upper part (2) at least one heatable press plate (3, 5) is arranged and
- The press belts (6) on the press plates (3, 5) with the interposition of rolling rods (7) are supported.
In order to avoid the disadvantages associated with rolling rods circulating in chains, it is provided that at least part of the rolling rods (7) are rotatably mounted in hydrostatic bearings (24) under the influence of a pressure medium.

Description

The invention relates to a continuous press for pressing pressed material mats into pressed material strips in the course of the production of wood-based panels,
with press bottom and press top,
in the press base and press top endlessly circulating press belts between which the Pressgutmatte is compressible, wherein at least one heatable press plate is arranged in the press base and / or in the press upper part and
The steel press belts are supported on the press plates with the interposition of rolling rods.

The mentioned continuous press is known in the production process of wood-based panels. Particle boards, OSB boards, lightweight boards, multi-layer boards, HDF or MDF boards are mentioned by way of example.

The scatterable good scattered on a conveyor belt (essentially glued wood chips) will be referred to below as Pressgutmatte. These pressed material mats can have thicknesses of a few millimeters up to one meter. Nowadays, the scattering stations are capable of varying the spread rate over one or more metered adjustable scattering stations in the conveying direction of the conveyor belt as well as in the transverse direction. Several successive scattering stations allow the formation of different layers, such as cover and middle layers.

The conveyor belt forwards the pressed material mat to the continuous press. In the invention, this press is realized to act on the conveyor belt in a conveying direction supplied Pressgutmatte with pressure and heat usually by a double belt press. Such devices are often used for two purposes. Once solid products, such as the mentioned strand of pressed chips or fibers are created by them. The invention focuses on the production of particleboard or fiberboard. About the pressure and possibly a distance setting, the grit mat is thus compressed and pressed.

On the other hand, the heat supply allows to liquefy binder or to allow moisture to evaporate.

As a starting point of this invention can be considered exactly as the applicant by the name "ContiRoll" designated continuous press. By way of example, such a press is in the DE 10 2006 038 918 A1 described. The 2 in this application, the cited document is taken (there 1 ) to more easily describe the closest prior art to the invention.

In 2 Accordingly, the prior art is a continuous press for pressing pressed material mats 1 shown to Pressgutplatten in the course of the production of wood-based panels. The press has in its basic structure a press top 2 with heated upper press plate 3 and a press bottom 4 with heated lower press plate 5 on, wherein in the press upper part 2 and in the press base 4 each endlessly circulating steel press belts 6 are provided, which with the interposition of rolling rods against the press plates 3 . 5 are supported. When the press is in the embodiment is an upper piston press, in which the lower press plate 5 as it is fixedly arranged on the press table, while the upper press plate 3 for opening and closing the press and in particular for pressing the pressed material mats 1 with cylinder piston arrangements 8th is acted upon, which are supported against the press frame. To the press plates 3 . 5 can inlet side projecting inlet plates connect, which are also acted upon for setting a desired inlet contour of the inlet mouth with cylinder piston assemblies. This is in the 2 not shown. The rolling rods 7 are in the press shell 2 and in the press base 3 each on link chains 9 guided, which in an upper chain circulation 10 and in a lower chain circulation 11 each over several deflection units 12a . b respectively. 13a . b circulate. Outlet side in the area of the press upper part 2 in the direction of the belt is initially a lower deflection unit 12a and then an upper deflection unit 12b intended. Accordingly, in the press base 3 in the direction of rotation initially an upper deflection unit 13a and then a lower deflection unit 13b arranged. In this case, each deflection unit 12a . b ; 13a . b in a conventional manner at least two deflection wheels, which may be formed, for example, as gears.

In the upper chain circulation 10 is an upper chain tensioner 14 provided, wherein the already described upper deflection unit 12b as upper tensioning unit 12b is trained. Accordingly, in the lower chain circulation 11 a lower chain tensioner 15 provided, in which case the lower deflection unit 13b as lower tensioning unit 13b is trained. For adjusting the chain tension by means of assigned adjusting drives 16 are the clamping units 12b . 13b each movable. The two clamping units 12b . 13b are to pivotally mounted swivel lever 17 connected, with the actuators 16 turn to this pivot lever 17 are connected. So there is the possibility with the help of the actuators 16 either to set a desired chain tension during the pressing operation as well as to pull out the looseness of the chain in the course of opening the press. The swivel levers 17 are on the outside of the press frame G connected bearing jaws 18 hinged. The press frame G itself has several lined in the press longitudinal direction press frame 19 on, on which the upper side and underside in the press longitudinal direction extending side members 20 . 21 are connected, with the side members 20 . 21 are formed in the embodiment as a double-T-carrier. The described bearing jaws 18 the upper clamping device 14 are on the upper side to the upper side members 20 connected while the bearing jaws 18 the lower clamping device 15 on the underside of the lower side members 21 are connected. Furthermore, it can be seen that the adjusting drives 16 the upper clamping device 14 above the upper side member 20 are positioned while the actuators 16 the lower clamping device 15 below the lower side member 21 are arranged. To ensure perfect guidance of both the rolling rods 7 as well as to allow the steel press belts, the pivot lever or the bearing jaws of at least the upper clamping device 14 positioned so that the tensioning unit 12b associated pivot lever 17 outside on both sides of the steel press belts 6 are passed. At the pivot levers 17 For example, these can be pivot rods or pivot rods.

The actuators 16 are in the embodiment as linear actuators 16 , as a hydraulic cylinder piston assemblies 16 with each cylinder 22 on the one hand and pistons 23 on the other hand trained. Here are the cylinders 22 to the press frame G connected while the pistons 23 to the pivot lever 17 are connected. It is further provided that the cylinder piston assemblies 16 Both sides are pivotally mounted, ie the cylinder 22 is pivotable on the press frame G fastened while the piston 23 pivotable to the pivot lever 17 connected.

In this description, it becomes clear how complicated the bias of a link chain is. Such a chain with its connected, rotatably mounted rolling rods is for example in the DE 20012659 U1 described in detail.

The drives of such itself already relatively complicated lashing chains are also accurate to regulate only with great difficulty. The risk of inadmissible, a course generating forces on the rolling rods when the chains stretch with time, is large, especially in unequal lengthening of the chain right to left.

In general, such chains are characterized by a great deal of wear. This is due to the storage of the rolling rods and their rolling behavior, especially in the inlet and outlet of the pressing area. Furthermore, a sufficient lubrication of the rolling rods is extremely difficult to ensure.

The object of the invention is therefore to avoid the disadvantages associated with circulating rolling rods in chains.

The object is achieved for the continuous press by the features of claim 1 and in particular by the fact that the rolling rods are rotatably mounted in hydrostatic bearings under the influence of a pressure medium.

Roll bars are therefore still used to exert the power transmission from the engageable press plates on the rotating press belts. But the rolling rods do not run in a circulating in a closed circuit chain, but are - apart from thermal expansion of the fasteners for the hydrostatic bearing - rotatably mounted at least in the production direction. On susceptible chains with bearings for the rolling rods can be completely dispensed with according to the invention. Instead, under the influence of a pressure medium, such as a pressurized oil, a roll bar is allowed to rotate stationary in the hydrostatic bearing, thus creating the support between press plates and press belts.

Preferably, the hydrostatic bearings for the rolling rods are attached to the press plates.

During production, the press plates have a fixed position and several hydrostatic bearings can be attached over their entire length. The press plates, which are often heated, remain separated only by the bearing and the rolling rods, in close proximity to the rotating press belts. The heat to be introduced into the pressed material mats can thereby be transferred relatively easily.

Advantageously, the hydrostatic bearings are arranged in the direction of passage of the fiber mat at a distance which is smaller than 200 mm, preferably smaller than 80 mm.

Depending on the thickness of the pressed material mat is thereby ensured that the press belt is guided with a relatively straight course through the pressing region of the continuous press.

Preferably, the rolling rods have diameters in the range of 10 to 40 mm and lengths of 200 to 3000 mm.

So they are rolling rods, which have the smallest possible diameter and can extend in the longitudinal direction of a partial width to the entire machine width. Advantageously, such high Hertzian pressure can be exerted on the press belt and thus also on the pressed product mat.

Advantageously, a hydrostatic bearing has a channel with a circular segment-like cross section, which can accommodate a roll bar.

It is associated with particular advantage when the channel with a circular segment-like cross-section surrounds the rolling rod by more than 180 °, that is, the circular arc of the circle segment has a circumferential angle of more than 180 °.

Of course, the rolling bar must extend beyond the edge of the channel at least so far that contact with the press belt is possible. But with an enclosure of more than 180 °, the roll bar can not fall out of the camp.

It is also particularly advantageous if in the channel next to the rolling bar a crescent-shaped pressure chamber remains in the cross-section, which is provided with a pressure medium inlet. Here, for example, oil can be supplied under high pressure and using a hydrostatic throttle. This can also happen at several inlets to the pressure chamber.

In the pressure chamber, a pressure is exerted on the roller bar. The pressure medium ensures a virtually frictionless rotation of the rolling rod. Between the channel edge and the roll bar, a small part of the pressure medium can escape and provide good lubrication between the roll bar and the press belt. It is therefore advantageous if a pressure fluid outlet gap between an edge of the channel and the rolling rod is provided.

Preferably, it is provided that at least one elastic collar is provided laterally on a press belt and / or a press plate in the direction of passage of the press material mat.

This collar causes the leaked from the hydrostatic bearing pressure medium that has been deposited on the press belt or the press plate, laterally can not run out of the continuous press or even get into the pressed material mat. The collar should be elastic and be able to follow the bends of the press belt or press plate. The collar can be glued for example as a rubber band.

Preferably, a suction device is provided for emerging from the hydrostatic bearing pressure medium.

With the help of such a suction device, the leaked from the hydrostatic bearing pressure medium can be sucked off before it passes critical areas of the press.

It is particularly preferred if the suction device comprises a proboscis, the suction nozzle (open end of the trunk) is located between two collar.

This solution, for example to avoid oil spills in the system, is particularly easy to implement. Such a suction nozzle consists only of a possibly curved tube which is connected to a suction pump. Oil that accumulates between the elastic collars can be easily removed with this suction cup.

In a preferred embodiment, it is also provided that most hydrostatic bearings for rolling rods in the continuous press are made identical.

This makes mass production possible for the hydrostatic bearings, so that the production costs can be greatly minimized. All bearings can also be supplied uniformly with the pressure medium.

The invention will be explained in more detail below with reference to the drawings.

• 1 einen schematischen und vereinfachten Ausschnitt einer Seitenansicht der erfindungsgemäßen kontinuierlichen Presse
• 2 zeigt den bereits beschriebenen Stand der Technik

It shows

• 1 a schematic and simplified section of a side view of the continuous press according to the invention
• 2 shows the already described prior art

1 shows a side section of a continuous press for pressing pressed material mats 1 , The pressed material mat 1 is clamped between an upper and a lower press belt 6 , Somewhat spaced from the press belts 6 are the upper press plate 3 and the lower press plate 5 , At least one of these press plates 3 . 5 , which are usually heated, can be adjusted in a manner not shown on cylinder. The pressure is about rolling rods 7 transferred to hydrostatic bearings 24 are rotatably mounted. The numerous hydrostatic bearings 24 are spaced below 200 mm both at the top press plate 3 as at the lower press plate 5 attached. They consist in the embodiment of the same bearing blocks 34 that have a channel 25 include. The channel has a circular segment-like cross-section, in which a rolling rod is housed and is surrounded by the circular segment-like cross section by more than 180 °. Part of the rolling rod 7 however, looks out of the circular segment-like channel cross-section and has contact with the press belt 6 , Such a roll bar should have a diameter between 10 and 40 mm and a length between 200 and 3000 mm.

In the channel 25 of the storage block 34 remains between roll bar 7 and duct wall a pressure chamber 27 that has a pressure medium feed 28 with pressure medium, usually oil is supplied. For a simple supply option, each pressure medium inlet 28 with a connection 29 , For example, for a pipe or hose connection, provided. In the pressure medium inlet 28 is arranged in a known manner for hydrostatic bearings, a throttle, not shown. In the pressure room 27 So is an oil under sufficient pressure and transmits those of the press plate 3 . 5 outgoing force on the roll bar 7 , in turn, on the press belt 6 is applied. The oil is at the same time the lubricant that it does with a quick rotation of the rolling rods 7 in the channel 25 does not come to wear.

Between the roll bar 7 and the channel edge 26 of the canal 25 is a pressure medium outlet gap 30 from which minimal pressure medium can escape. This is an almost completely frictionless rotatable mounting of the rolling rod in the hydrostatic bearing 24 guaranteed. But also the wear between roll bar 7 and press belt 6 is kept as low as possible.

Through the pressure medium outlet gap 30 If necessary, pressure medium reaches the surrounding press belt in the upper area of the continuous press 6 and in the lower part of the continuous press, if necessary on the lower press plate 5 , So that the pressure medium does not drip sideways out of the continuous press, an elastic collar is in the upper area on the press belt and in the lower area on the press plate 31 For example, from a rubber-like material provided. That is between outer collar 31 (in 1 only a short cut section is shown) accumulating oil is removed by means of a suction device 32 dissipated. For this purpose, a saufrüssel connected to a fan, not shown, generates negative pressure 33 with its suction in the appropriate areas.

LIST OF REFERENCE NUMBERS

1

press material mat

2

Press top

3

Upper press plate

4

Press lower part

5

Lower press plate

6

Press belts

7

roll bar

8th

Cylinder-piston arrangement

9

link chain

10

Upper chain circulation

11

Lower chain circulation

12, 12a, 12b

Umlenkaggregat

13, 13a, 13b

Umlenkaggregat

14

Chain tensioner

15

Chain tensioner

16

Cylinder piston assembly

17

pivoting lever

18

bearing bracket

19

press frame

20

longitudinal beams

21

longitudinal beams

22

cylinder

23

piston

24

Hydrostatic rollersticker

25

channel

26

channel edge

27

pressure chamber

28

Pressure inflow

29

connection

30

Pressure fluid outlet gap

31

collar

32

suction

33

proboscis

34

bearing block

G

frame

Claims (12)

Continuous press for pressing pressed material mats (1) into pressed product slabs in the course of the production of wood-based panels, with press bottom (4) and press upper part (2), in press base (4) and press upper part (2) endlessly circulating press belts (6) between which the pressed material mat (1) is compressible, wherein - supported the press belts (6) to the pressing plates (3, 5) with the interposition of rolling rods (7), characterized - in the press lower part (4) and / or in the press upper part (2) at least one heatable press plate (3, 5) is arranged and in that at least part of the rolling rods (7) are rotatably mounted in hydrostatic bearings (24) under the influence of a pressure medium. Continuous press after Claim 1 , characterized in that the hydrostatic bearings are fixed to the pressing plates (3, 5). Continuous press after Claim 1 or 2 , characterized in that the hydrostatic bearings are arranged in the direction of passage of the fiber mat at a distance which is smaller than 200 mm, preferably smaller than 80 mm. Continuous press after one of Claims 1 to 3 , characterized in that the rolling rods (7) have diameters in the range of 10 to 40 mm and lengths of 200 to 3000 mm. Continuous press after one of Claims 1 to 4 , characterized in that at least one hydrostatic bearing (24) has a channel (25) with a preferably circular segment-like cross section, which can receive a rolling rod (7). Continuous press after Claim 5 , characterized in that the channel (25) with the circular segment-like cross-section surrounds the rolling rod (7) by more than 180 °. Continuous press after Claim 5 or 6 , characterized in that in the channel (25) next to the rolling rod (7) a pressure chamber (27) remains, which is provided with a pressure medium inlet (28). Continuous press after one of Claims 5 to 7 , characterized in that a pressure medium exit gap (30) between an edge (26) of the channel (25) and the rolling bar (7) is provided. Continuous press after one of Claims 1 to 8th , characterized in that at least one elastic collar (31) is laterally provided on a press belt (6) and / or a press plate (3, 5) in the direction of passage of the press material mat (1). Continuous press after one of Claims 1 to 9 , characterized in that a suction device (32) for emerging from the hydrostatic bearing (24) pressure medium is provided. Continuous press after Claim 10 , characterized in that the suction device (32) comprises a suction nozzle (33), the suction nozzle is located between two collar (31). Continuous press after one of Claims 1 to 11 Characterized in that most of the hydrostatic bearing (24) for rotating rods (7) are identical made.

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