WO2009033628A1

WO2009033628A1 - Particulate-material installation

Info

Publication number: WO2009033628A1
Application number: PCT/EP2008/007336
Authority: WO
Inventors: Jörg PUDEG; Friedhelm SCHLÜPEN
Original assignee: Siempelkamp Maschinen- Und Anlagenbau Gmbh & Co. Kg
Priority date: 2007-09-10
Filing date: 2008-09-08
Publication date: 2009-03-19
Also published as: EP2197639A1; CN101821069A; EP2197639B1; CN101821069B; DE102007042666B3

Abstract

Particulate-material installation for scattering particulate material onto a scattering belt conveyor, particulate-material screens or the like, to form particulate-material mats, having at least one particulate-material bunker for the particulate material which is to be scattered onto the scattering belt conveyor, having at least one conveyor worm device which is arranged above the particulate-material bunker and has at least one conveyor worm which is driven in rotation in a worm housing and is intended for filling a particulate-material bunker, and having at least one chute between a discharge opening of the worm housing and a filling opening of the particulate-material bunker, characterized in that the conveyor worm apparatus has at least one displaceable discharge insert, in the region of the discharge opening, for the purpose of varying the discharge position.

Description

The scattering material plant

Description:

The invention relates to a grit plant for scattering (glued) grit on a scattering belt conveyor, on grit screens or the like grit transport, to form grit mats for the production of wood-based panels or in the course of the production of wood-based panels, with at least one Streu bunker aufzustreuende on the scattering belt conveyor Scattering material, at least one arranged above the grit hopper screw conveyor device with at least one screw in a screw driven screw conveyor for filling the grit hopper and at least one chute between a discharge opening of the screw housing and a filling opening of the grit hopper. - Wood-based panels means within the scope of the invention, in particular fiberboard, z. As MDF (Medium Density Fiber), or chipboard or OSB boards. Such a grit bunker is designed, for example, as a horizontal bunker, which has a bottom-side dosing belt as well as a discharge device assigned to the dosing belt at the end, e.g. B. Austragswalzen- front with multiple discharge rollers for discharging grit on the scatter belt conveyor. The scatter belt conveyor is usually arranged below the grit hopper. In the upper region, such a grit bunker preferably has an upper conveyor, z. B. scratches, which initially conveys the grit entering the bunker in the rear of the grit hopper. This is to ensure that the grit bin works on the principle of "first in - first out". This is especially in the processing of glued spreading material, z. B. glued MDF fibers of importance, so that the first entering the grit hopper fibers are also first removed from this and scattered on the grit conveyor. The bottom-side dosing is also called Bunker bottom band called. With the dosing belt speed, the volumetric flow of the material to be spread out of the spreading material bunker can be adjusted. In this respect, such a grit plant preferably works in continuous operation and in particular in the course of the continuous production of wood-based panels in z. B. a continuous press. However, the invention also includes grit systems for tact presses, z. B. one-floor or multi-day presses, in which the grit from the bunker not on a continuous spreading belt conveyor, but z. B. is scattered on grit screens or the like.

Such grit systems are known from practice in various embodiments. They have basically proven themselves. It is of particular importance that with the help of such a grit plant grit mats perfect quality and especially uniform scattering good distribution should be applied to the scatter belt conveyor. For this reason, it is known not scatter the grit from the grit hopper directly on the scattering band, but first on a scattering head, which may be formed, for example, as Streuwalzenstraße and can ensure uniform spreading of the grit. In addition, it is known in this connection to provide a spreading material compaction separator between the discharge roller arrangement of the spreading material bunker and the spreading head or the spreading roller train, which has two opening rollers for this purpose (cf DE 43 02 850 C2).

Furthermore, there is known a device for producing spreading material mats, in which the spreading material is scattered by one or more conveyors on the scattering belt conveyor via a fiber distribution or opening device. This device for loosening or distributing fibers is arranged directly above the scatter band conveyor and has two superimposed pairs of rollers, which rotate in opposite directions with circumferentially arranged interlocking elements (see US 3,252,186). From DE 24 32 571 an apparatus for discharging spreading material, in particular for shedding chips in the course of the production of chipboard and the like is known, in which a screw conveyor with drivable screw shaft and a screw cylinder is provided, which is across the width of a bunker runs and is provided with upstream feeding device and a discharge. The worm cylinder has a helical circumferential discharge slot extending across the width of the bunker. In this case, the worm cylinder is driven in rotation. In this way, a uniform ejection of grit long reached the discharge line.

Incidentally, a screw conveyor with a pair of parallel twin screws is generally known which has a pressure-air-tight cover for the discharge opening which can be displaced by means of adjusting devices in the longitudinal direction of the screw. This screw conveyor is used, inter alia, in mining or civil engineering (see DE 88 16 651 U1). Such proposals had no influence on the development of gritters for the wood-based panels industry.

The invention has for its object to provide a grit system of the type described above, which allows the production of flawless grit mats with a simple and inexpensive construction and proper operation.

To solve this problem, the invention teaches in a generic grit system of the type described above, that the auger device in the region of the discharge opening for varying the discharge position has at least one displaceable discharge insert. The discharge insert is preferably displaceable at least along the screw longitudinal direction. The invention is based on the recognition that the quality of the grit mats generated in such a grit plant depends not only on the structure and operation of the grit hopper, his discharge roller front and in particular the scattering head, but that the way of filling the grit hopper a Influence on the distribution of the material to be spread on the Streubandbörderer downstream scattering belt conveyor has or may have. In this case, the invention has recognized that it is possible to produce grit mats of high quality when the grit bunker is filled in a perfect manner. For this purpose, the invention proposes a variation of the discharge position already in the area of the screw conveyor, which supplies the spreading material bunker the grit. This is particularly useful when at least one brake roller device is arranged within the chute, which has at least two rotationally driven brake rollers. Such brake rollers are preferably spaced apart by a predetermined amount and arranged with substantially parallel axes, so that they do not mesh with each other. It is expedient if the brake rollers are arranged approximately at the same height and therefore side by side. In such an embodiment, the spreading material does not enter the bunker via the chute unbraked, but via the brake rollers. These not only reduce the speed of falling through the chute fibers, but also provide for a turbulence or distribution of the fibers, so that compaction of the material to be spread, which can occur when hitting the material to be spread into the bunker can be reliably avoided. Such a brake roller device now operates in a particularly advantageous manner when the discharge position of the material to be spread can be adjusted or varied above the brake roller device via the discharge insert according to the invention. Thus, taking into account given empirical values or also by experiments, the optimum discharge position can be adjusted taking into account, for example, the rotational speed of the brake rollers or similar parameters. In this respect, the invention preferably provides a combination of the described screw conveyor device with the described brake roller device under protection. However, the invention also includes embodiments in which is dispensed with such a brake roller device in the chute.

Preferably, such a screw conveyor device not only has a single screw conveyor, but at least two substantially parallel to the axis side by side arranged augers, which are preferably housed in a single screw housing and work in a common direction of conveyance. These two or more conveyor screws is assigned a common discharge opening and also preferably a common displaceable discharge insert. These juxtaposed augers rotate preferably in opposite directions. By two juxtaposed counter-rotating screw conveyor, the grit hopper can be filled with high volume flow, with the adjustable ejection insert optimal adaptation to the circumstances, in particular taking into account the described brake roller devices is made possible.

In one possible development of the invention, alternatively or additionally, at least two substantially coaxial or axially parallel augers are provided, which operate in opposite directions of conveyance and consequently to one another. According to a possible embodiment, a total of four or more conveying screws can be used in combination with the above-described conveying screws, with two conveying screws each being arranged next to one another and working in the same conveying direction. In an embodiment with at least two oppositely arranged augers, the invention proposes that these preferably work on a common discharge opening and that each auger or auger pair is associated with a separate discharge insert. Furthermore, the invention proposes that the conveyor housing has one or more cylindrical or partially cylindrical guide shells which are assigned to the screw conveyors and which cover at least the lower region of the screw conveyors, wherein the screw conveyors rotate in these guide shells or guide tubs. The z. B. two juxtaposed guide shells can be combined to form a common guide trough or double trough (or double trough). In the discharge area, these guide shells then have at least one discharge opening. In that regard, it may be the discharge opening of the screw housing or even arranged within the screw housing discharge opening.

The discharge insert is adapted in its shape or in its cross section to the shape or the cross section of the guide shells. Thus, the discharge application z. B. move or adjust below the guide shells. In particular, in one embodiment with a pair of screws or with two juxtaposed snails, the invention proposes that the discharge insert as z. B. wedge-shaped or zwickelförmiger insert between two juxtaposed augers is arranged. Such a wedge-shaped discharge insert preferably has two arcuate shell sections, wherein each of these arcuate shell sections is associated with a screw conveyor.

The inventive variation or adjustment of the discharge position can be done manually according to a proposal of the invention, wherein the optimal discharge position z. B. is adjusted by experiments or taking into account previously obtained empirical values. In the optimal discharge position, a locking of the discharge insert may be provided in or on the worm housing. However, it is also within the scope of the invention that the ejection insert is remotely adjustable and therefore can be moved automatically. For this purpose, at least one suitable drive can be provided. In that regard, it may be an electric motor drive or a cylinder piston arrangement, z. B. a hydraulic and / or pneumatic actuating cylinder act.

In this context, it is also possible to vary the position of the discharge insert via a suitable control and / or regulation during the discharge operation or during the filling of the bunker.

In the following the invention will be explained in more detail with reference to a drawing showing only one exemplary embodiment:

1 shows a grit plant according to the invention in a simplified side view,

2 shows an enlarged detail of the article according to FIG. 1,

3 is a schematic plan view of the article of FIG. 2,

4 is a simplified view from the direction of the arrow A on the object of Fig. 2,

5 shows the object according to FIG. 2 in a modified embodiment, FIG.

6 is a simplified plan view of the article of FIG. 5,

Fig. 7 is a simplified (perspective) section of the article of FIG. 2 in a modified embodiment

Fig. 8 shows a detail of the device according to Fig. 1 in the region of

Brake rollers,

9 is a view of the article of FIG. 8 from the direction of arrow C, 10 shows a section through a spiked roller according to FIG. 9.

In the figures, a grit plant for scattering grit on a scatter belt conveyor 1 to form grit mats 2 for the production of wood-based panels is shown in fragmentary form. The spreading material may in particular be MDF fibers for the production of MDF boards. This grit plant has a grit hopper 3 for the scattered material to be sprinkled on the scatter belt conveyor 1. Above the grit hopper 3, a screw conveyor device 10 is arranged for filling the grit hopper. This screw conveyor device 10 has at least one auger 19a, 19b driven in rotation in a screw housing 18. Between the auger device 10 and the grit hopper 3 arranged below a chute 5 is arranged, which is connected at its upper end to a discharge opening 20 of the screw housing 18 and at its lower end to a filling opening 4 of the grit hopper 3. About this chute 5, the grit enters the grit hopper. The grit hopper 3 is formed in the embodiment as a horizontal bunker with a bottom-side dosing belt 6, which is also referred to as bunker bottom belt 6. At the end, the dosing belt 6 is followed by a discharge device, which is designed as a discharge roller front 7 with a plurality of discharge rollers. In the upper part of the bunker 3, an upper conveyor is indicated, which acts as a scratch, z. B. chain scraper 8 is formed. The working direction of the dosing belt 6 on the one hand and the scraper 8 on the other hand are also indicated. In this respect, it can be seen that the spreading material enters via the chute 5 in the region of the scraper 8 and from there first into the rear area of the bunker 3 is conveyed. From there it passes via the dosing belt 6 into the area of the discharge roller front 7, which throws the spreading material out of the bunker 3 onto the scatter belt conveyor 1 arranged below the bunker 3. It can be seen that the grit from the bunker 3 does not impinge directly on the scattering belt conveyor 1, but that on the applicator roller 7, the grit first occurs once on a scattering head 9, which in the embodiment as Streuwalzenstraße with a Variety of spreading rollers is formed. From there, the grit passes to form the grit mat 2 on the scatter belt conveyor 1. Typically, the scattering head 9 different mat treatment facilities are arranged downstream, z. As a Egalisiereinheit and / or a pre-press before the grit mat enters the hot press.

In the chute, and consequently in the fiber flow between screw conveyor device and grit hopper, a brake roller device 11 is arranged in the invention, which has two rotationally driven brake rollers 12. The brake rollers 12 are arranged at a predetermined distance from one another with axes arranged substantially parallel to one another. The brake rollers 12 are formed in the embodiment as spiked rollers, each having a plurality of spikes 13, which extend substantially in the radial direction.

According to the invention, the screw conveyor 10 in the region of the discharge opening 20 for varying the discharge position on at least one displaceable discharge insert 21, 21a, 21b. For this purpose, reference is first made to the embodiment of FIG. 2 to 4. The discharge insert 21 is displaceable along the screw longitudinal direction. In some figures (eg Fig. 3) different positions of the discharge insert 21 or 21a, 21b are indicated. The screw conveyor 10 has two substantially parallel to the axis arranged side by side screw conveyors 19a, which are arranged in a common screw housing 18. These are therefore twin screws 19a. The two adjacent augers 19a operate in a common conveying direction F1, but they rotate in opposite directions. The two screw conveyors 19a is associated with a common discharge opening 20. In addition, a single common discharge insert 21 is provided, which - as indicated in Fig. 2 is displaced to vary the discharge position. In this way, in particular in cooperation with the illustrated brake rollers 12, an optimized filling of the bunker 3, which in turn on the quality of the generated grit mats 2 positive effect. In particular, in Fig. 3 it can be seen that the two juxtaposed conveyor screws 19a have mutually offset worm threads in the screw longitudinal direction, ie the screw conveyors 19a are arranged as it were "gap". This arrangement does not change during operation, because the screw conveyors 19a rotate at the same speed or rotational speed and are preferably synchronized with each other. This ensures a permanent relative arrangement "on the gap". Taking into account the illustrated opposite direction of rotation material transport in the direction of the screw center or the screw space is guaranteed, which avoids material deposits in particular. This applies in particular in connection with the configuration of the ejection insert and the guide shells explained below.

In the modified embodiment according to FIGS. 5 to 7, not only a single screw conveyor pair is provided, but there are provided two pairs of opposed screw conveyor, d. H. on the one hand (right) two adjacent auger 19a, which operate in the one conveying direction F1 and opposite (left) two further juxtaposed augers 19b, which operate in the opposite direction F2. All of these four screw conveyors 19a, 19b work on a common discharge opening 20, wherein each of the two screw conveyor pairs 19a and 19b each have their own discharge insert 21a or 21b is assigned, which according to the invention in each case (independently) are displaceable. Also in this embodiment, the above-described arrangement of the respective screw pairs is provided "on the gap".

Within the conveyor housing 18, cylindrical or partially cylindrical guide shells 22 are assigned to the conveyor screws 19a, 19b, which are arranged below the conveyor screws 19a, 19b and have the discharge openings 20 in the discharge area, or open into the discharge opening. In particular, in Figs. 4 and 7 can be seen that the discharge insert 21 is adapted in its shape or in its cross section to the shape or the cross section of the guide shells 22, so that the discharge insert 21 properly below (or above) the guide shells 22 can be moved to adjust the discharge position. The discharge insert 21 (or 21a, 21b) is wedge-shaped or zwickeiförmig formed in the embodiment and as it were positioned between two adjacent auger 19a (or 19b). For this purpose, for example, refer to FIGS. 4 and 7. Consequently, each discharge insert 21 (or 21a, 21b) has two arcuate shell sections 23, wherein each of the arcuate shell sections 23 is associated with a screw conveyor. The gusset insert can according to FIG. 7, a vertical or straight front edge 24 or z. B. according to FIG. 2 have an oblique or rounded front edge 24. The adapted shell sections of the gusset insert 21 (or 21a, 21b), in particular in combination with the opposite direction of rotation of the screws 19a (or 19b) ensures proper operation, as in particular material deposits are avoided. The twin screws push the material, as it were, inwards over the gusset or its shell sections in the direction of the discharge opening. The adaptation of the gusset insert to the worm housing and the worms avoids dead spaces and a setting of the grit. This is particularly advantageous because it is preferably glued grit. As already explained above, the screws preferably rotate at the same speed. For this purpose, a single drive can be provided for a pair of screws, so that a mechanical synchronization takes place. However, the screws can also be provided with separate drives, so that then provided via the drives synchronization. The common speed can be fixed. However, the screws can also be operated with a variable or adjustable speed, it is advantageous if this variable speed for the two screws of a pair of screws is set identical, in particular to guarantee the above-described offset. The discharge insert 21 and the discharge insert 21 a, 21 b are moved manually in the embodiment, ie the discharge position is set manually, the discharge insert is then optionally locked in a suitable position. However, there is also the possibility of an automatic adjustment or a remote adjustment. This is not shown in the figures. In any case, it is expedient if the discharge application over z. B. lateral guide elements 16 is guided.

Incidentally, FIGS. 8 to 10 show details of the brake rollers 12 arranged in the fiber flow. As explained, these are spiked rollers 12 with a multiplicity of spikes 13. For this purpose, each spiked roller 12 has a plurality of spiked combs 15 fastened to the shaft 14. which extend over the entire width of the spiked roller. The individual spiked combs 15 are each arranged in pairs at a predetermined angle α to each other. In the embodiment, six spiked combs 15 are provided, which are each arranged in pairs at an identical angle to each other, wherein the angle is 60 ° in the embodiment. Each of these spiked combs 15 is formed as a one-piece manufactured spiked plate. The individual spiked plates 15 are screwed to the shaft and thus releasably connected to the shaft.

Incidentally, it can be seen in the figures that not only the spiked rollers 12 according to the invention are arranged in the chute 5, but that a pendulum chute 17 is provided above the spiked rollers 12 and consequently between the screw conveyor 10 and the spiked rollers 12 in the chute Trough or movable pipe section may be formed and provides by a pendulum movement for a distributed loading of the chute with grit. The interaction of this pendulum chute 17 with on the one hand the brake rollers 12 and on the other hand the sliding ejection insert 21, 21 a, 21 b according to the invention leads to particularly good scattering results. The pendulum chute 17 is z. B. indicated in Fig. 2. She commutes z. B. along the longitudinal direction of the rollers 12, that is, the pendulum axis is preferably transverse to the axis of rotation of the rollers 12th

Claims

claims:

1. grit plant for scattering of grit on a Streubandförderer (1), grit screens or the like, to form grit mats (2), with

at least one grit hopper (3) for the grit to be spread onto the scatter belt conveyor (1),

at least one above the grit hopper (3) arranged screw conveyor device (10) with at least one in one

Screw housing (18) rotatably driven screw conveyor (19a, 19b) for filling the grit hopper (3) and

at least one chute (5) between a discharge opening (20) of the screw housing (18) and a filling opening (4) of the

Spreading bunker (3),

In order to vary the discharge position, the screw conveyor device (10) has at least one displaceable discharge insert (21, 21 a, 21 b) in the area of the discharge opening (20).

2. Installation according to claim 1, characterized in that within the chute (5) at least one brake roller device (11) is arranged, which has at least two rotationally driven brake rollers (12).

3. Plant according to claim 1 or 2, characterized in that the grit hopper (4) as a horizontal bunker with at least one bottom-side metering conveyor, z. B. dosing belt (6), and at least one end of the dosing conveyor associated discharge, z. B. Austragswalzenfront (7), for discharging grit on a below the bunker (4) arranged scatter band conveyor (1) is formed.

4. Installation according to one of claims 1 to 3, characterized in that the discharge insert (21, 21 a, 21 b) is displaceable at least along the screw longitudinal direction.

5. Installation according to one of claims 1 to 4, characterized in that the screw conveyor device (10) has at least two substantially parallel to the axis side by side in a screw housing (18) arranged screw conveyors (19a) which operate in a common conveying direction (F1) the screw conveyors (19a) is associated with a common discharge opening (20) and a common discharge insert (21).

6. Plant according to claim 5, characterized in that the juxtaposed conveyor screws (19 a) rotate in opposite directions.

7. Installation according to claim 6, characterized in that the juxtaposed conveyor screws (19 a) in the worm longitudinal direction offset from one another have arranged worm threads.

8. Plant according to claim 7, characterized in that the juxtaposed conveyor screws (19a) rotate at the same speed or rotational speed and are preferably synchronized with each other.

9. Installation according to one of claims 1 to 8, characterized in that the screw conveyor device (10) has at least two substantially coaxially or axially parallel oppositely disposed screw conveyors (19a, 19b) which operate in opposite conveying directions (F1 and F2).

10. Plant according to claim 9, characterized in that the oppositely arranged conveyor screws (19a, 19b) are associated with a common discharge opening (20) and in each case a separate discharge insert (21a, 21b).

11. Installation according to one of claims 1 to 10, characterized in that the conveyor housing (18) one or more or the screw conveyors (19a, 19b) associated with cylindrical or partially cylindrical guide shells (22), which in the discharge area on the underside one or the Have discharge opening.

12. Plant according to claim 11, characterized in that the discharge insert (21, 21 a, 21 b) is adapted in its shape to the shape of the guide shells (22).

13. Plant according to claim 12, characterized in that the discharge insert (21, 21 a, 21 b) as z. B. wedge-shaped or zwickeiförmiger insert between two juxtaposed conveyor screws (19a, 19b) is arranged and has two each associated with a worm arcuate shell sections (23).

14. Installation according to one of claims 1 to 13, characterized in that the discharge insert (21, 21 a, 21 b) is manually displaceable and possibly lockable.

15. Plant according to one of claims 1 to 14, that the discharge insert (21, 21 a, 21 b) is remotely adjustable.