DE202012104538U1 - Chute arrangement with a double cleaning device, in particular for a device for gluing - Google Patents

Abstract

Fall chute arrangement (10; 20; 30; 40; 50; 60), in particular for a device for gluing particles (1) which at least partially consist of fibers and / or chips suitable for the production of material plates, the chute arrangement (10; 20 ; 30; 40; 50; 60) a chute (21; 31; 41; 51; 61), which has an inlet for feeding the particles (1) and an outlet for discharging the particles (1) and at least a first cleaning device for Cleaning at least one inner wall (21a ... 21d) of the chute (21; 31; 41; 51; 61); characterized in that the chute arrangement (10; 20; 30; 40; 50; 60) further comprises at least one second cleaning device for cleaning the at least one first cleaning device.

Description

The present invention relates to a chute arrangement according to the preamble of claim 1.

The production of material plates from, for example, chips or medium-density fibers or other free-flowing materials are now automated processes and have already been used in many countries for many years. As is known, the compression of processed chips or fibers takes place either clock-bound or continuously. In addition to the many plant components before and after the press, the production of a spreading material mat by means of spreading machines plays an outstanding role, since the quality of the produced spreading material mat is an important factor in addition to the quality of the raw materials. The urge to produce cost-effective material plates from natural raw materials and artificially produced binders forces producers to develop more and more efficient processes. Special emphasis is on low downtime and low wear.

The present development relates to the field of gluing the particles with a binder. Basically, the term binder is understood to mean a so-called adhesive liquor which consists of an adhesive in its main component. Depending on requirements, in addition emulsion, hardener, formaldehyde scavengers, dyes, insect repellent and antifungal agents and other additives are added. It is also common to use the adhesive without additives.

The following are suitable as binders without any claim to completeness: isocyanates, MDI, melamine urea formaldehyde (MUF), urea formaldehyde (UF), MUPF or PF.

The gluing is typically carried out such that the grit or the particles are introduced by means of a metering device in a chute and by means of nozzles which are arranged in the chute or this upstream, is acted upon or become the binder. The glued spreading material is usually treated in a downstream of the chute drum with rotating conveyor tools (mechanical mixer) and / or glued on and then sprinkled to a grit mat and then pressed in real time, before curing a glue. Alternatively, the grit may be introduced directly into a spreader without passing through a mechanical mixer to sprinkle the grit mat and then crimp.

Such a device is for example off DE 10 2010 064 339 A1 known.

Here, there is the problem that binders and particles glued to the binder may accumulate on the inner wall of the chute so that the chute tends to become soiled. This makes it necessary to clean the chute regularly. For this, the plant usually has to be shut down, which brings with it a corresponding loss of production.

In addition, there is the possibility that solid deposits of not negligible size may form on the inner wall of the chute over time. If such deposits dissolve and fall into the mixer, it is not ensured that such lumps of solid deposits in the mixer are crushed and dissolved. It may therefore be in the paste of glued particles leaving the mixer, further solid lumps, which in the further course of the production of material plates can lead to impairment of product quality and / or damage to the presses.

In order to prevent or reduce the soiling of the inner walls of a chute and the formation of solid deposits on these, is in the document WO 2011/134844 A1 proposed to cover the inner walls of the chute with doctor blades or spatulas. The spatulas are firmly attached to a support structure consisting of an upper ring and a lower ring. The upper ring is connected to a toothed ring with internal teeth, which is driven by a pinion and a motor. Driven so driven the doctor blades in a rotational movement about a vertical axis on the inner wall of the rotationally symmetrical chute.

Although it can be prevented in this way that form larger deposits on the inner wall of the chute, but at the price that new elements and surfaces are introduced into the chute with the doctor blades, which in turn soil and on which solid deposits can form. Thus, it can happen, especially in large plants, that can form on the doctor blades caking, which weigh up to 50 kg and can fall off in a lump, which can lead to damage of the mixer and / or the subsequent machines.

In the document WO 2011/134844 A1 Therefore, it is proposed to cool the doctor blades to a temperature which is below the condensation point of the humidity, so that a Condensate film is formed on the surfaces, which is to reduce the adhesiveness of the injected chemical components, in particular of thermosetting adhesives.

Depending on the requirements of a particular application, in particular depending on which binder and / or which additives are used, it may be undesirable that condenses moisture in the chute. In this case, the document WO 2011/134844 A1 proposed doctor blade cooling can not be used effectively.

In other cases, depending on the binder used and / or the additives used, the effect of a condensate film is not or only slightly, so that adhesion is only slightly reduced, or even reversed, if certain binders or additives in moisture and / or at reduced temperatures show an increased tendency to stick and / or clump together. Even in these cases, a use of the document WO 2011/134844 A1 proposed Schaberklingenkühlung not be displayed.

In addition, it is for the realization of the document WO 2011/134844 A1 proposed Schaberklingenkühlung required to provide appropriate supply lines and discharges for a cooling fluid having a sufficient delivery capacity. In order to supply the walls of a rotating chute and / or rotary doctor blades with the cooling fluid, it is also necessary that corresponding fluid-carrying coupling means are provided, which is a transfer of cooling fluid from a stationary part of the system to the rotating chute walls and / or the rotary doctor blades enable. The mechanical structures required for this can be a great effort and it may be difficult to achieve a permanently effective seal.

It is therefore an object of the present invention to provide a chute assembly which can effectively prevent the formation of solid buildup within a chute.

It is therefore an object of the present invention to provide a chute assembly which is applicable to chutes of various shapes.

Further, it is an object of the present invention to provide a chute assembly that can be easily integrated into already built facilities.

These and other objects of the invention are achieved by a chute assembly according to claim 1. Further preferred embodiments are set forth in the dependent claims.

As a solution, a chute arrangement is specified, in particular for a device for gluing particles which at least partially consist of fibers and / or chips suitable for producing material plates, wherein the chute arrangement has a chute which has an inlet for feeding the particles and an outlet for delivering the particles, at least one first cleaning device for cleaning at least one inner wall of the chute and at least one second cleaning device for cleaning the at least one first cleaning device.

While the first cleaning device allows to keep the inner wall or the inner walls of the chute clean, the second cleaning device allows the first cleaning device to be cleaned as well. It can thus be effectively ensured that no solid deposits form in the chute.

In a preferred embodiment, the first cleaning device can be designed as at least one movable support element which is arranged to be movable relative to an associated first inner wall of the chute relatively, in particular parallel, wherein at least a first stripping element is arranged or formed on the movable support element, such stripped assigned inner wall when the movable support element is moved.

In this way it is possible to realize an effective and reliable first cleaning device with relatively little design effort.

The movable support member may be arranged to pass through a gap formed between two adjacent inner walls or between two ends of an inner wall.

It is also contemplated that the support member simultaneously represents a partial wall of the chute or an inner wall of the chute.

The movable support member may be formed as a wall, with a height corresponding to the stripped height of the associated inner wall.

Preferably, the movable support member may be formed resiliently.

The second cleaning device may in particular comprise at least one second stripping element.

In particular, the second stripping element can be arranged on a wall or a carrying element.

In this way it is possible with relatively little design effort to realize an effective and reliable second cleaning device.

It is in particular possible to form the movable support element as a wall element of the chute which forms an inner wall of the chute.

The chute may have a plurality of wall elements, which are each formed arcuate, wherein each wall element partially overlaps another wall element on the outside thereof.

In a further preferred embodiment, the first cleaning device may have at least one first scraper associated with the at least one inner wall, and the second cleaning device may include at least one second scraper and drive means for moving the second scraper from a rest position along an axis substantially parallel to the scraper such as to scrape off the first scraper

In another preferred embodiment, the first cleaning device may comprise at least a first scraper and drive means for moving the first scraper from a rest position along an axis substantially parallel to the at least one inner wall, so as to scrape off the first inner wall, and the second cleaning device at least a second scraper and drive means for moving the second scraper from a rest position over the first scraper positioned in the rest position, so as to scrape off the first scraper.

In yet another preferred embodiment, the first cleaning device may have at least one flexible stripping element, in particular an endless stripping element, for cleaning the at least one inner wall.

The use of a flexible stripping element has the advantageous effect that the stripping element can easily adapt to different shapes of the chute.

In particular, the chute arrangement may further comprise a first guide device and a second guide device, wherein the first guide device and the second guide device are arranged to hold and guide the at least one stripping element in a tangential direction relative to the at least one inner wall between the stripping element and to allow the at least one inner wall of the chute, further comprising drive means adapted to act on the chute, the first guide means, the second guide means and / or the at least one stripping member to produce the relative movement.

Preferably, the first and / or the second guide means comprises: a plurality of guide means, in particular guide rollers or guide gears, and an endless guide element, in particular an endless guide cable, an endless guide belt, an endless guide wire or an endless guide chain, which or which circulates the guide means wherein the at least one flexible stripping element is attached directly or via holding means and / or deflection means to the endless guide element.

In particular, the use of a rope or a wire has the advantage that this or this can be very varied in structure and already unprocessed has a rough surface, which is particularly suitable for cleaning. In addition, both have a relatively small surface, which effectively precludes the formation of large adhesions. In addition, due to its high flexibility, a rope has relatively high self-cleaning characteristics and is also easy to clean.

The endless stripping element can be arranged by means of deflecting means to enclose a wall element of the chute which has at least one inner wall.

The endless scraper element can also be arranged so that it is arranged running in the region of the inner wall within the chute.

When the endless scraper element is disposed to extend within the chute, two portions of the endless scraper element are located adjacent the inner wall so as to provide a double stripping action by the endless scraper element.

Drive means may preferably be provided which are set up to set the at least one flexible stripping element into a reciprocating movement in the direction of the longitudinal extension of the stripping element.

By the reciprocating movement of the scraper element, which can be in particular an oscillating movement, the stripping effect, which the scraper element on the inner wall or deposits, which adhere to the inner wall, can be improved.

Preferably, two winding devices are further provided, wherein the flexible stripping element is connected to the winding devices in order to be wound and unwound by the winding devices can.

It can further be provided drive means which are adapted to put the endless stripping element in a circumferential movement.

By the circumferential movement of the scraper element, which in particular can be combined continuously, intermittently and / or with a reciprocating movement, the stripping effect which the scraper element adheres to the inner wall or to deposits adhering to the inner wall can be improved.

The at least one endless stripping element may extend adjacent the at least one inner wall of the chute in a substantially horizontal direction.

The at least one endless scraper element can also extend adjacent to the at least one inner wall of the chute in a substantially vertical direction and / or extend correspondingly to a shape of the chute in the vertical direction.

It can further be provided clamping means which are adapted to act on the first guide means and / or the second guide means and / or the at least one stripping, that the at least one stripping element is kept under tension.

The stripping element can be guided past the second cleaning device or guided through the second cleaning device.

The second cleaning device can also be designed as a fluid bath, a brush, a wiper edge, or a stripping cylinder.

Preferably, the second cleaning device can be configured as an obstacle arranged or insertable in the travel path of the at least one stripping element.

The insertable obstacle may in particular be arranged in a wall of the chute having the at least one inner wall, wherein the engageable obstacle projects between a first position in which the obstacle protrudes from the inner wall in the direction of the interior of the chute, and a second position in which Obstacle does not protrude beyond the inner wall towards the interior of the chute, is adjustable.

The first stripping element and / or the second stripping element and / or the scraper can be designed as a spatula blade, as a spatula, or as a rod, in particular a round rod.

The first stripping element and / or the second stripping element and / or the flexible stripping element can also be designed as a rope, in particular a wire rope, as a wire, as a band or as a chain.

Since a rod, in particular a round rod, a rope, a wire or a band has a comparatively small surface area, the likelihood that larger solid adhesions form on it is reduced.

Preferably, the chute is tapered in the direction of the particle from top to bottom in cross section.

The chute can be cylindrical, conical, cube-shaped, regular or irregular polygon, or wedge-shaped.

The chute in the region of the inlet and in the region of the outlet have cross-sections of different shapes.

The cross sections of different shapes may be selected from circular, elliptical, square, rectangular, a shape of a regular or irregular polygon, and a shape consisting of composite arc segments.

The chute can be designed in several parts, with a plurality of walls, each forming an inner wall of the chute.

The chute can have a substantially concave shape.

The at least one inner wall, preferably all inner walls of the chute can be stripped at least once in two minutes, in particular once a minute.

Preferably, a tempering device may further be provided for tempering the at least one inner wall to a temperature which is below a threshold for the curing of the binder, preferably below 70 ° C.

In a preferred development, the first cleaning device can have at least one spatula which is set up to move relative to the at least one inner wall and the second cleaning device has a flexible stripping element, which is stretched over the at least one inner wall in the travel path of the spatula.

As a further solution is a device for the gluing of particles, which consist at least partially of suitable for the production of material plates fibers and / or chips, wherein the device comprises a chute assembly.

The apparatus may further comprise a supply means for feeding the particles and a plurality of nozzles for discharging a binder, the nozzles being arranged in an area inside the chute and / or above an inlet opening of the chute.

More preferably, the device has a mixing device downstream of the chute arrangement.

Embodiments of the invention are illustrated below with reference to the drawings:

1 shows schematically a device for the gluing of particles;

2A shows a schematic plan view of a chute arrangement according to a first embodiment of the present invention;

2 B FIG. 12 is a schematic lateral cross-sectional view of the chute assembly of FIG 2A group;

2C FIG. 12 is a schematic lateral cross-sectional view of the chute assembly of FIG 2A in a variant;

2D FIG. 12 is a schematic plan view of the chute assembly of FIG 2A in a further variant;

3A shows a schematic plan view of a chute arrangement according to a second embodiment of the present invention;

3B shows the chute arrangement of 3A in a condition with distorted walls;

4 shows in a schematic lateral cross-sectional view of a chute assembly according to a third embodiment of the present invention;

5 shows in a schematic lateral cross-sectional view of a chute assembly according to a fourth embodiment of the present invention;

6A shows in a schematic lateral cross-sectional view of a chute assembly according to a fifth embodiment of the present invention;

6B FIG. 12 is a schematic plan view of the chute assembly of FIG 6A group;

6C and 6D schematically show a first variant of the chute arrangement of 6A and 6B ;

6E schematically shows a further variant of the chute arrangement of 6A and 6B ;

6F shows an exemplary embodiment of a second cleaning unit;

6G and 6H schematically show a further variant of the chute arrangement of 6A and 6B ; and

6I and 6J schematically show a turn variant of the chute arrangement of 6A and 6B ,

Due to the extensive examples, the reference numerals will be referred to below 21x . 23x . 24x . 31x . 32x . 33x . 34x introduced as an indication of multipartite, denoted by a to d instead of x.

In 1 is a schematic view of a device for gluing of particles starting with the metering device 2 and ending with a mixing device 7 shown in a general representation. In between are a chute 3 and a chute assembly to be described in more detail below 10 arranged. The particles are thereby as particle stream 1 in the metering device 2 , usually from a particle bunker by means of discharge devices, registered, weighed there and a standard band control (not shown) for dosing in the chute 4 brought in. There the particle flow or particles hits 1 on a dissolving device 3 and becomes a particle curtain there 5 resolved and / or split. The dissolving device 3 can in particular rake and / or baffles, spoke rollers (consisting of at least two discs which have arranged at a radial distance from the axis of rotation (with or without a continuous shaft) rods, tubes or the like parallel to the axis of rotation) and / or opening rollers, preferably designed as spiked rollers , exhibit. The dissolved particle curtain 5 becomes then by means of suitable nozzles 6 sprayed with a binder and glued.

In the course of the particle curtain falls 5 through the chute arrangement 10 and then enters the chute assembly 10 downstream mixing device 7 in which by means of a shaft driven by a rotating 9 Mixing tools 8th Mix the glued particles again mechanically and finally output as a mixed particle flow (discharge arrow). The glued particle stream is then stored in a dosing hopper or directly into a spreader to form a grit mat, which can be pressed in a further press in a press to a material plate and / or cured, introduced.

Basically, the chute arrangement should 10 have a sufficient drop height so that the binder can bond sufficiently strong with the particles and should preferably in the direction of fall at least half as long as the chute 4 be educated. As shown, the chute can 4 and the chute arrangement 10 be provided as separate facilities. Alternatively, it is also possible that the chute 4 a unit with a chute of the chute arrangement 10 forms.

With reference to the 2A to 6J Now, various embodiments of a chute assembly will be described, which serves as a chute arrangement 10 in the device of 1 is usable.

A first embodiment of a chute arrangement 20 is in the 2a to 2c shown.

The 2A to 2C provide a chute arrangement 20 with a chute 21 dar. The chute 21 has a rectangular cross-section, wherein four walls or wall elements each have an inner wall 21a , ..., 21d of the chute 21 define. Between each two inner walls 21a , ..., 21d , or the respective inner walls having walls or wall elements, in each case a gap is formed, through which at least one support element 23a , ..., 23d is arranged.

The carrying elements 23a , ..., 23d are each an inner wall 21a , ..., 21d associated and slidably disposed along a direction substantially parallel to the surface thereof. At an end region of each support element 23a , ..., 23d is a scraping element 22a , ..., 22d arranged.

The carrying elements 23a , ..., 23d and the stripping elements 22a , ..., 22d provide first cleaning means for cleaning the associated inner walls 21a ... 21d the chute, wherein the cleaning of an inner wall 21a , ..., 21d takes place by the associated support member in a direction parallel to the respective inner wall 21a , ..., 21d is offset, so that the stripping element 22a , ..., 22d over the inner wall 21a , ..., 21d strips and cleans them in this way and of any binder or particles 1 who have deposited on this cleanse.

The stripping elements 22a , ..., 22d may be formed as a spatula blade, as a spatula, as a rod, in particular round rod, as a rope, as a wire, as a band, as a chain, as a brush or in any other suitable form.

The supporting elements 23a , ..., 23d can be formed, for example, as elongated sheets, as in the 2 B represented, for example, in each case two sheets 23a arranged one above the other in parallel and the stripping element 22a on the two sheets 23a is arranged.

It is possible as well as in 2C shown, the support elements 23a , ..., 23d each form as a wall, which in height substantially over the stripped area of the respective associated inner wall 21a , ..., 21d extend.

Other embodiments of the support elements 23a , ..., 23d are also possible.

While the 2A to 2C a chute 21 With a rectangular cross-section extending in the direction of the particle in the direction of the particle in a straight line, this is not limiting. So can the chute 21 , For example, in the form of a reverse truncated pyramid, from top to bottom in the direction of the particle 1 to be rejuvenated.

Also other cross sections, for example in the form of regular or irregular polygons are possible. The interior walls 21a , ..., 21d can run in a horizontal direction in a straight line, or may be formed concave with a pointing inward of the chute curvature or convex with a pointing outward of the chute curvature; In these cases, the support elements may also be formed with corresponding curvatures, so that they follow when adjusting the curvature of the respective associated inner walls and it is ensured in this way that the stripping 21a , ..., 21d can clean the assigned inner walls by overlapping.

The supporting elements 23a , ..., 23d be in the process at respectively associated second cleaning facilities 24a , ..., 24d passed, which the carrying elements 23a , ..., 23d clean.

The second cleaning facilities 24a , ..., 24d can be arranged in various ways, such as in the 2a shown. The second cleaning device thus cleans at least parts of the first cleaning device.

The second cleaning means may be as a side or an edge of an inner wall, or as stripping elements 24a , ..., 24d be designed in particular as a spatula blade, as a spatula, as a rod, in particular round rod, as a rope, as a wire, as a band, as a chain or in any other suitable form.

Thus, the second cleaning device (the stripping element 24b ) as a side or edge of an inner wall 21a be formed or act on the one supporting element 23 or other parts of the first cleaning device pass by during shifting so as to be stripped and cleaned ( 2A , top right).

Similarly, as the second cleaning means on the side of an inner wall 21d a stripping element 24a be arranged. Will the carrying element 23a staggered, it touches with its inside the chute 21 facing surface on the stripping element 24a over and gets stripped and cleaned this way ( 2A , top left).

It is also possible as a second cleaning device, the stripping 24c at one end of one of the carrying elements 23b train. When the carrying element 23b completely in the direction of the inside of the chute 21 is moved, the scraper comes 24c in contact with the interior of the chute 21 facing side of the support element 23c , Will the carrying element 23c offset, it touches the scraper element 24c over and gets stripped and cleaned this way ( 2A , bottom right).

Finally, the stripping element 24d also outside the drop shaft 21 be arranged such that when the support member 23d it is offset with its inside the chute 21 facing surface on the stripping element 24d touches and is stripped and cleaned in this way ( 2A , bottom left).

It can be after 2D be preferred in this case that the support elements 23a , ..., 23d are resilient, so that at the end of a support element 23a arranged scraper element 22a by the effect of the elastic force against the inner wall 21a is pressed. Will the carrying element 23a offset, therefore, even in the case of a curved inner wall, the scraper element 22a safely along and over the curved inner wall 21a strip to strip and clean.

So it can, as in the example of 2D shown to be sufficient, the chute 21 form with a substantially circular or elliptical cross-section, with a single wall, which has an inner wall 21a having. Through a gap between the two ends of the wall is the support element 23a into the interior of the chute 21 led into it. The wall may be curved in the form of a spiral, so that the two ends of the wall overlap, thus the wall circumscribes an angle greater than 360 °. Between the ends of the gap is formed, through which the support member 23a passed through.

The carrying element 23a can be designed as a resilient wall whose height is substantially the height of the stripped area of the inner wall 21a of the chute 21 equivalent.

Be at least two preferably narrow support elements 23a used, at the end of a preferably rigid scraper element 22a , such as a round bar, is arranged, it is also possible, the chute 21a than in the direction of the particle to taper from top to bottom, in particular in the form of an inverted truncated cone. It is preferred that for each support element 23a a separate drive (not shown) is provided, wherein the drives are controlled, the support elements 23a so that the stripping element 22a with substantially constant vertical orientation along the inner wall 21a of the chute 21 is moved. Analogous to 2A the second cleaning device in the example is separately outside the chute 21 as a scraping element 24d arranged.

With reference to the 3A and 3B now becomes a chute arrangement 30 described according to a second embodiment.

The chute arrangement 30 has a chute 31 on, which is formed of a plurality of wall elements, each having an inner wall 31a , ..., 31d which are curved according to a substantially arc shape, in particular a circular arc shape or elliptical arc shape.

The total sum of angles included in the arcuate wall elements corresponds at least to an angle of 360 ° + the angle encompassed by the longest wall element.

Like in the 3A to recognize, overlap the wall elements partially, such that a wall element with an inner wall 31a an adjacent wall element with an inner wall 31b overlapped outside, as well as from another adjacent wall element with an inner wall 31d is overlapped on the outside.

On each wall element is a stripping element 32a , ..., 32d arranged, in such a way, the respective outer inner wall 31a , ..., 31d to overlap the associated, adjacent wall element.

As indicated by the arrows, each of the wall elements can be adjusted or moved, so that the wall element can be rotated in particular about a center associated with the arc. This is exemplary in the 3B shown. In this way, for example, the inner walls 31a and 31b be offset relative to each other, so that the stripping element 32b over the inner wall 31a strips and cleans them.

For the inner wall 31a therefore represents the wall element 31b and the stripping element 31b a first cleaning device, which is the inner wall 31a cleans. The wall element 31c and the stripping element 32c turn represent a second cleaning device, which the inner wall 32b and thus cleans the first cleaning device.

In a third embodiment, in the 4 is shown, has a chute arrangement 40 a chute 41 on, in the known manner at least a scraper blade or a scraper 42 is arranged as a first cleaning device to the inner wall 41a slough. It can be the chute 41 relative to the scraper 42 and / or the scraper 42 relative to the chute 41 moved, in particular be rotated about a rotation axis.

The chute arrangement 40 further comprises a second cleaning means in the form of at least one scraper blade or a scraper 44 on, by means of an electric motor, hydraulically or pneumatically actuated feed axis as a drive means 43 from a rest position along a substantially to the scraper 42 parallel axis can be adjusted, so, the scraper 42 strip and clean in this way.

In the case of a movable scraper 42 can be provided that the scraper 42 first moved to a cleaning position and shut down in this before the scraper 44 is moved from the rest position.

In addition, as in the 4 represented a hopper 45 be provided, which is not part of the chute arrangement 10 needs to be. The funnel 45 forms together with the inner wall 41a of the chute 41 a gap through which the scraper 42 into the interior of the chute 41 can be performed. The funnel 45 may further provide protection against soiling by the gluing agent and / or glued particles 1 form. In this gap could be to keep the chute clean 41 Also, a coat of air or no longer sticky, but already glued particles are introduced.

In a fourth embodiment, in the 5 is shown, has a chute arrangement 50 a chute 51 on.

The chute arrangement 50 also has a first cleaning device in the form of at least one scraper blade or a scraper 52 on, by means of an electric motor, hydraulically or pneumatically actuated feed axis as a drive means 53 from a rest position indicated by dashed lines along a substantially inner wall 51a parallel axis can be adjusted, so, the inner wall 51a strip and clean in this way.

The chute arrangement 50 also has a second cleaning device, preferably in the form of at least one scraper blade or a scraper 54 is formed, by means of an electric motor, hydraulically or pneumatically actuated feed axis 55 as drive means from a rest position over the scraper positioned in the rest position 52 can be moved, so, the scraper 52 strip and clean in this way.

Instead of a scraper blade or a scraper 54 Another suitable stripping device can also be used as a cleaning device. If beyond the scraper 54 or the other suitable stripping device is arranged such that the scraper blade or the scraper 52 when moving out of the chute 51 Passing this, can also drive on a 55 be waived.

In a fifth embodiment, a chute arrangement 60 a flexible stripping element 62 as the first cleaning device, as in the 6A to 6J shown.

As in the 6A and 6B shown in this embodiment, the chute 61 be rotationally symmetrical, in particular conical, with a wall having an inner wall 61a Are defined. The wall of the chute may be arcuately curved, so that the chute 61 in the direction of the particle from top to bottom tapers.

In this embodiment, the first cleaning device may be a flexible stripping element 62 , in particular an endless rope, preferably designed as a wire rope having.

The endless rope is over a deflection 63 , here a pulley, so guided and held that it is the wall of the chute 61 wraps around, leaving the rope in both the chute 61 adjacent to the inner wall 61a , as well as outside the drop shaft 61 runs.

The pulley may be associated with a drive (not shown) to move over the pulley rope in the direction of extension of the endless rope in motion. The movement may be an intermittent or continuous circumferential movement of the rope, or an oscillating reciprocation of the rope, or a combination thereof.

To a relative movement between the stripping 62 and the chute 61 or its inner wall 61a to generate, so that the rope tangential to the inner wall 61a moved to strip these can by suitable drive means (not shown) of the chute 61 moved, in particular be rotated about a rotation axis, and / or guide means may be provided, which the deflection means 63 are assigned, as in more detail with respect to the 6C and 6D will be described.

To prevent the attachment of gluing agents or glued particles on the rope 1 form, which could clump, is a second cleaning device with stripping 66 provided for cleaning the rope and arranged so that the rope passes past or through this.

This second cleaning device may be formed, for example, as a brush, doctor blade, or as a scraping edge, where the rope is moved past, or as a stripping gap or as a stripping cylinder, through which the rope passes. The second cleaning device can also be configured as a fluid bath which is filled, for example, with water and / or a cleaning agent and through which the wiping element 62 is led to gluing agents and / or particles 1 to wash off and solve this.

Due to the interior of the chute 61 pointing curved or concave shape of the chute 61 , in which the wall may be formed in particular cambered, there is the advantageous effect that the rope to a particularly good support against the inner wall 61a of the chute 61 comes to rest and due to its flexibility the shape of the inner wall 61a adapts. This allows a particularly secure cleaning of the inner wall 61a of the chute 61 be achieved.

In order to increase this effect even more tensioning devices can be added 64 . 65 be provided in the 6A exemplified as a spring and a pinch roller to tension the rope.

The flexibility of the rope as a stripping element 62 it also allows that the rope to different cross sections of the chute 61 as a rectangular cross-section with a large opening width in the inlet region and a much smaller circular cross-section in the outlet region, such as in the 6C and 6D shown.

As in the 6C and 6D shown, the chute can 61 be designed in several parts, for example, with four walls that the four inner walls 61a to 61d define. In the area of the inlet points the chute 61 a rectangular cross-section on while the chute 61 is formed in the region of the outlet with a circular cross-section. The walls of the chute are curved arcuately, so that the chute 61 in the direction of the particle 1 tapered from top to bottom.

As in the example of 6A and 6B is also in the example of 6C and 6D the stripping element 62 as a rope over a deflection 63 guided and held so that it encloses a wall of the chute so that the rope both in the chute 61 adjacent to an interior wall 61d , as well as outside the drop shaft 61 runs. Different for example from the 6A are in the example of 6C in the lower end of the chute 61 the walls each with a bead or arc portion as a deflection 67 formed for the rope, which serves to redirect the rope and hold. The bead can therefore be considered as a guide device and as a deflection device.

The deflection 63 is associated with a guide device, which is an endless guide element 69 such as a chain, and guide means 68 , such as gears. As in particular in 6D shown, are the guiding means 68 arranged so that they tension the circulating chain so that they are the chute 61 circulates.

The examples mentioned are not restrictive and it can serve as a guide element 69 also a Rope, in particular a steel cable, a band, a wire or the like can be used. As a guide 68 It is also possible to use rollers, slide rails or other elements which are suitable for holding and guiding the corresponding guide device and redirecting it as required.

A motor (not shown) may be connected to one of the guide means 68 be connected to the chain as a guide element 69 to drive and set in motion. Because the pulley with the chain 62 the guide means is connected, the flexible, endless stripping element or the rope is brought in this way, in a direction tangential to the surface of the inner wall 61d to move. In this way, the rope can be the inner wall 61d , or all interior walls 61a , ..., 61d of the chute 61 strip and clean them using any binder, or glued particles 1 that are on the inner walls 61a , ..., 61d have been staked off.

The second cleaning device as a stripping element 66 may be installed in a predetermined, fixed location to clean the rope when it is moved by means of the guide means and associated drive means in a corresponding cleaning position. The cleaning device may also be associated with a guide device and move with it, in order to move the rope over the inner walls 61a to 61d of the chute 61 to follow.

While in the 6A to 6D the endless rope enclosing a wall, it is in an in 6E illustrated modification also possible, the endless rope over a deflection 72 to guide so that the endless rope as a stripping element 62 within the chute 61 runs so that the trailing and the return portion of the rope both in abutment against the inner wall 61d of the chute 61 come. Such guidance of the rope has the advantageous effect of a smaller space requirement, since no clearance for the outside of the chute 61 extending portion of the rope is required. In addition, the inner wall 61d twice overlined by the double rope, resulting in a better cleaning performance.

The second cleaning device is in the example of 6E as a wiper edge 71 carried out, at which the rope is passed to strip this.

In one in the 6E and 6F illustrated variant, the second cleaning device as a in the travel 74 of the rope as a stripping element 62 insertable obstacle 75 be formed, preferably in a the at least one inner wall 61a ... 61d having wall of the chute 61 is arranged, with the einbringbare obstacle 75 between a first position in which the obstacle from the inner wall 61a ... 61d towards the interior of the chute 61 protrudes, and a second position in which the obstacle does not have the inner wall 61a ... 61d protrudes, can be adjustable. The insertable obstacle 75 For example, can be adjusted pneumatically, hydraulically or by electric motor and can be formed for example as a mandrel or cone. In this aspect is the travel path 74 for better understanding in 6E illustrated.

If the incurable obstacle 75 is introduced, it opposes the movement of the rope. The rope is thereby stretched until it reaches the obstacle 75 "Snaps by" or until the rope by adjusting the obstacle 75 is released. The thus tensioned rope relaxes in a sudden movement that swing the rope and "tremble" and / or on the inner wall 61a , ..., 61d can whip up, causing gluing agents and / or particles 1 , which have settled on the rope, can be shaken off. It is preferred that the direction of movement of the rope can be reversed to the rope from both directions against the adjustable obstacle 75 to move.

The 6G and 6H show a further variant in which a rope to two winding devices 73 is attached, which can wind up and unwind the rope. By appropriate control of a drive (not shown) of the winding devices 73 For example, the rope can be moved in a reciprocating motion in the longitudinal direction of the rope.

The 6G and 6H continue to show leadership institutions, for example, as Zustellachsen or rails 76 may be formed, where the winding devices 73 are fastened, for example by means of a carriage or a sliding element (not shown), or in the running rail 76 moves. In the 6H are exemplary rails 76 represented, which the winding devices 73 guide and hold, and about the winding facilities 73 the this circulating rope. By means of the rails 76 Therefore, the rope can over the surface of the inner wall 61d be moved away.

For the other interior walls of the chute 61 can also each rails 76 be provided, on which winding devices are arranged, which are associated with corresponding ropes; Because of the clarity of the presentation was in the 6G and 6H waived their representation. Alternatively, the running rail 76 according to the chute 61 arcuate and running around.

With reference to the 6A to 6H Examples have been given in which a flexible stripping element 62 like a rope in a substantially vertical direction in the area of an inner wall 61a , ..., 61d runs. However, this is not limiting, and as in the 6I and 6J shown example, the chute arrangement 60 also be designed so that a flexible scraper element 62 adjacent to an interior wall 61a , ..., 61d of the chute 61 extends in a substantially horizontal direction, for example as an endless rope that via deflection 63 to be led.

Preferred is for each inner wall 61a , ..., 61d of the chute 61 one flexible stripping element each 62 provided that, for example, can be designed as an endless rope, which is arranged so the respective inner wall 61a , ..., 61d to embrace how it is in the 6I the example of the inner wall 61d is shown.

The interior walls 61a , ..., 61d of the chute 61 may extend in a substantially straight line in the horizontal direction, or may be concave, in particular cambered, so that they are in the direction of the interior of the chute 61 bent as shown in the 6I the example of the inner wall 61b shown.

The deflection 63 are associated with respective guide means (not shown) which may be arranged, the deflection means 63 to move in a substantially vertical direction, as indicated by the arrows of 6J displayed so that the wiper element 62 the extent of the inner wall 61d following the chute in a substantially vertical direction tangential to the surface of the inner wall 61d is moved and this wipes in a substantially vertical direction. The movement axis can be suitably substantially perpendicular, substantially the course of the lateral edge of the inner wall 61d following or otherwise appropriate.

As guide means band or cables may be provided, similar to those with respect to the 6A to 6H described.

It is also possible, the guide means as Zustellachsen or as guides, in particular linear guides to design, the Umlenmittel 63 each on a running in the guide carriage (not shown) are attached, which is actuated by electric motor, pneumatic or hydraulic.

While the invention has been described by way of example of preferred embodiments, these are not limiting. Thus, various aspects of the various embodiments may be combined or interchanged. In particular, different forms of first and / or second cleaning devices can be combined in a chute arrangement. Similarly, different types of scraper elements 62 or leadership facilities are combined.

Also, the guide means are not limited to the examples described. Thus, instead of the guide means described, for example, as guides, in particular linear guides, designed guide means are provided which have a running in the guide carriage (not shown), which is actuated by electric motor, pneumatic or hydraulic.

Also, guide means may be used which are in the form of a slide rail on which a scraper member is slidably held by, for example, a sliding member or roller disposed in the rail.

While examples have been given in which the wiper element 62 by means of the first and second guide means relative to an inner wall 61a , ..., 61d of the chute 61 is moved, this is not limiting, and it is also possible to move the chute itself by suitable drive means. For example, the chute 61 Be configured rotationally symmetrical and are offset by appropriate drive means in a rotational movement, so that the inner wall of the chute 61 with reference to the stripping element 62 emotional. The stripping element 62 can be held stationary by corresponding first and second guide means, while the inner wall of the stripping 62 moved over. It is also possible, a movable scraper element 62 with a movable chute too 61 combine.

The guiding devices can be both outside and inside through the chute 61 be arranged spanned space. Be the management facilities within the chute 61 Covers may preferably be provided to protect the guide means from fouling, and / or additional wiping means which may, for example, be disposed on the flexible wiper member for overstretching and thus cleaning the guide means disposed within the chute.

Furthermore, the chute arrangement can have a tempering device for tempering one or more inner walls to a temperature which is below a threshold for the curing of the binder, preferably below 70 ° C.

LIST OF REFERENCE NUMBERS

1

particle

2

metering

3

dissolver

4

chute

5

particle curtain

6

jet

7

mixing device

8th

Mixing tools

9

wave

10

Chute arrangement

20

Chute arrangement

21

chute

21x, a, b, c, d

inner wall

22

stripping element

23

supporting member

24

guide element

30

Chute arrangement

31

chute

31x, a, b, c, d

inner wall

32

stripping element

40

Chute arrangement

41

chute

41x, a, b, c, d

inner wall

42

scraper

43

drive means

44

scraper

45

hopper

50

Chute arrangement

51

chute

51a

inner wall

52

scraper

53

drive means

54

scraper

55

drive means

60

Chute arrangement

61

chute

61x, a, b, c, d

inner wall

62

stripping element

63

deflecting

64

clamping means

65

clamping means

66

stripping element

67

deflecting

68

guide means

69

guide element

71

stripping

72

deflecting

73

winding device

74

traverse

75

obstacle

76

runner

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102010064339 A1 [0006]
• WO 2011/134844 A1 [0009, 0011, 0012, 0013, 0014]

Claims (30)

Chute arrangement ( 10 ; 20 ; 30 ; 40 ; 50 ; 60 ), in particular for a device for gluing particles ( 1 ), which consist at least partially of fibers and / or chips suitable for producing material plates, wherein the drop shaft arrangement ( 10 ; 20 ; 30 ; 40 ; 50 ; 60 ) a chute ( 21 ; 31 ; 41 ; 51 ; 61 ) having an inlet for feeding the particles ( 1 ) and an outlet for dispensing the particles ( 1 ) and at least one first cleaning device for cleaning at least one inner wall ( 21a ... 21d ) of the chute ( 21 ; 31 ; 41 ; 51 ; 61 ) having; characterized in that the chute arrangement ( 10 ; 20 ; 30 ; 40 ; 50 ; 60 ) further comprises at least one second cleaning device for cleaning the at least one first cleaning device. Chute arrangement ( 20 ; 30 ) according to claim 1, characterized in that the first cleaning device as at least one movable support element ( 23x ; 31x ) is configured, the relative, in particular parallel, to an associated first inner wall ( 21x ; 31x ) of the chute ( 21 ; 31 ) is arranged movable, wherein at least a first stripping element ( 22x ; 32x ) on the movable support element ( 23x ; 31x ) is arranged or formed, in such a way, the associated inner wall ( 21x ; 31x ) when the movable support element ( 23x ; 31x ). Chute arrangement ( 20 ; 30 ) according to claim 2, characterized in that the movable support element ( 23x ; 31x ) is arranged through a gap passing between two adjacent inner walls ( 21x ) or between two ends of an inner wall ( 21x ) is trained. Chute arrangement ( 20 ; 30 ) according to one of claims 2 to 3, characterized in that the movable support element ( 23x ; 31x ) is formed as a wall, with a height corresponding to the height to be scrapped of the associated inner wall ( 21x ; 31x ) corresponds. Chute arrangement ( 20 ) according to one of claims 2 to 4, characterized in that the movable support element ( 23x ; 31x ) is resilient. Chute arrangement ( 20 ) according to one of claims 2 to 5, characterized in that the second cleaning device at least a second stripping element ( 24x ) having. Chute arrangement ( 20 ) according to claim 6, characterized in that the second stripping element ( 24x ) on a wall or a support element ( 23x ) is arranged. Chute arrangement ( 30 ) according to one of claims 2 to 4, characterized in that the movable support element as an an inner wall ( 31x ) of the chute ( 31 ) forming wall element of the chute ( 31 ) is trained. Chute arrangement ( 30 ) according to claim 8, characterized in that the chute ( 31 ) has a plurality of wall elements, which are each formed arcuate, wherein each wall element partially overlaps another wall element on the outside thereof. Chute arrangement ( 40 ) according to claim 1, characterized in that the first cleaning device at least a first scraper ( 42 ), of the at least one inner wall ( 41a ) assigned; and the second cleaning device at least one second scraper ( 44 ) as well as drive means ( 43 ) for moving the second scraper ( 44 ) from a rest position along a substantially to the first scraper ( 42 ) parallel axis, so, the first scraper ( 42 ) strip Chute arrangement ( 50 ) according to claim 1, characterized in that the first cleaning device at least a first scraper ( 52 ), and drive means ( 53 ) for moving the first scraper ( 52 ) from a rest position along a substantially to the at least one inner wall ( 51a ) parallel axis, in this way, the first inner wall ( 51a ) strip; and the second cleaning device at least one second scraper ( 54 ) as well as drive means ( 55 ) for moving the second scraper ( 44 ) from a rest position above the first scraper positioned in the rest position ( 52 ), so, the first scraper ( 52 ) strip. Chute arrangement ( 60 ) according to claim 1, characterized in that the first cleaning device at least one flexible stripping element ( 62 ), in particular an endless stripping element ( 62 ), for cleaning the at least one inner wall ( 61x ) having. Chute arrangement ( 60 ) according to claim 12, characterized in that the chute arrangement ( 60 ) further a first guide means; and a second guide device, wherein the first guide device and the second guide device are arranged, the at least one scraper element ( 62 ) to hold and guide, in such a way, a relative movement in the tangential direction to the at least one inner wall ( 61x ) between the stripping element ( 62 ) and the at least one inner wall ( 61x ) of the chute ( 61 ), further providing drive means are set up on the chute ( 61 ), the first guide device, the second guide device and / or the at least one stripping element ( 62 ) to produce the relative movement. Chute arrangement ( 60 ) According to claim 13, characterized in that the first and / or the second guide means comprises: a plurality (of guide means 68 ), in particular guide rollers or guide gears, and an endless guide element ( 69 ), in particular an endless guide wire, an endless guide band, an endless guide wire or an endless guide chain, which or the guide means ( 68 ), wherein the at least one flexible stripping element ( 62 ) directly or via holding means and / or deflection means ( 63 . 72 ) to the endless guide element ( 69 ) is attached. Chute arrangement ( 60 ) according to one of claims 12 to 14, characterized in that the endless stripping element ( 62 ) by means of deflection means ( 63 . 67 ) is arranged so that it is a wall element of the chute ( 61 ) enclosing the at least one inner wall ( 61x ) having. Chute arrangement ( 60 ) according to one of claims 5 to 7, characterized in that the endless stripping element ( 62 ) is arranged so that it is in the region of the inner wall ( 61x ) within the chute ( 61 ) is arranged running. Chute arrangement ( 60 ) according to any one of claims 12 to 16, characterized in that drive means are provided, which are arranged, the at least one flexible stripping element ( 62 ) in a reciprocating motion in the direction of the longitudinal extent of the stripping element ( 62 ) to move. Chute arrangement ( 60 ) according to one of claims 12 to 17, characterized in that two winding devices ( 73 ) are provided, wherein the flexible stripping element ( 62 ) with the winding devices ( 73 ) is connected to the winding devices ( 73 ) can be wound up and handled. Chute arrangement ( 60 ) according to one of claims 12 to 17, characterized in that drive means are provided, which are arranged, the endless stripping element ( 62 ) in a circumferential movement. Chute arrangement ( 60 ) according to one of claims 12 to 19, characterized in that the at least one endless stripping element ( 62 ) adjacent to the at least one inner wall ( 61x ) of the chute ( 61 ) extends in a substantially horizontal direction. Chute arrangement ( 60 ) according to one of claims 12 to 19, characterized in that the at least one endless stripping element ( 62 ) adjacent to the at least one inner wall ( 61x ) of the chute ( 61 ) extends in a substantially vertical direction and / or a shape of the chute ( 21 ; 31 ; 41 ; 51 ; 61 ) runs in the vertical direction accordingly. Chute arrangement ( 60 ) according to one of the preceding claims, characterized in that further clamping means ( 64 . 65 ) are provided, which are arranged on the first guide device and / or the second guide device and / or the at least one stripping element ( 62 ), that the at least one stripping element ( 62 ) is kept under tension. Chute arrangement ( 60 ) according to one of claims 12 to 22, characterized in that the stripping element ( 62 ) passing past the second cleaning device or passing through the cleaning device. Chute arrangement ( 60 ) according to claim 23, characterized in that the second cleaning device is designed as a fluid bath, a brush, a stripper edge, or a stripping cylinder. Chute arrangement ( 60 ) according to claim 23, characterized in that the second cleaning device as a in the travel path ( 74 ) of the at least one stripping element ( 62 ) arranged or insertable obstacle ( 75 ) is trained. Chute arrangement ( 60 ) according to claim 25, characterized in that the insertable obstacle in one of the at least one inner wall ( 61x ) wall of the chute ( 61 ), wherein the insertable obstacle ( 75 ) between a first position in which the obstacle from the inner wall ( 61x ) in the direction of the interior of the chute ( 61 ) and a second position in which the obstacle ( 75 ) not over the inner wall ( 61x ) in the direction of the interior of the chute ( 61 ) protrudes, is adjustable. Chute arrangement ( 10 ; 20 ; 30 ; 40 ; 50 ; 60 ) according to one of claims 2 to 26, characterized in that the first stripping element ( 22x ; 32x ) and / or the second stripping element ( 24x ; 32x ) and / or the scraper ( 42 . 44 ) is designed as a spatula blade, as a spatula, or as a rod, in particular round rod. Chute arrangement ( 10 ; 20 ; 30 ; 40 ; 50 ; 60 ) according to one of claims 2 to 26, characterized in that the first stripping element ( 22x ; 32x ) and / or the second stripping element ( 24x ; 32x ) and / or the flexible stripping element ( 62 ) is designed as a rope, in particular wire rope, as a wire, as a band or as a chain. Chute arrangement ( 10 ; 20 ; 30 ; 40 ; 50 ; 60 ) according to one of the preceding claims, characterized in that the chute ( 21 ; 31 ; 41 ; 51 ; 61 ) has cross sections of different shape in the region of the inlet and in the region of the outlet. Chute arrangement ( 10 ; 20 ; 30 ; 40 ; 50 ; 60 ) according to claim 1, characterized in that the first cleaning device comprises at least one spatula which is adapted to move relative to the at least one inner wall; and the second cleaning device comprises a flexible scraper element, which is tensioned in the travel path of the spatula over the at least one inner wall.

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