Curved channel system, device for a device for producing press plates or a device for the device and method for preventing the deposition of adhesive and / or particles in a curved channel system

Abstract

An arcuate channel system (15) for deflecting a particle flow with glued particles (26), providing particles for producing pressboard, in particular material boards produced from wood and / or other recycled agricultural products, such as particleboard, fiberboard, straw board and chipboard and plastic board, a device for or for a device for producing pressboard, and a method for preventing the glue and / or particles (26) from being deposited on the inner side of the wall of at least one arcuate channel (16). The arcuate channel system (15) comprises an arcuate channel (16) with at least one bend for guiding the particle flow. At least one protective particle feed channel (108) is provided, which opens into the arcuate channel (16) unilaterally from the radially outer side with respect to the at least one bend.

Description

Technical Field

[0001] The invention relates to an arcuate channel system for deflecting a particle flow with glued particles, wherein particles are provided for producing pressed plates, in particular for material boards produced from wood and / or other recycled agricultural products, such as particle boards, fiber boards, straw boards and chipboards as well as plastic boards, the arcuate channel system having an arcuate channel with at least one bend for guiding the particle flow.

[0002] Furthermore, the invention relates to a device for producing pressed boards or a device of such a device, in particular for producing material boards produced from wood and / or other recycled agricultural products, such as particle boards, fiber boards, straw boards and chipboards, and plastic boards, the device having at least one gluing device for gluing particles, an arc-shaped channel having at least one bend for guiding a particle flow with glued particles, and at least one separation device for separating transport air from the glued particles.

[0003] Furthermore, the invention relates to a method for preventing adhesive and / or particles from being deposited on the inner side of the wall of at least one curved channel for conveying a particle flow of glued particles, wherein these glued particles are provided for the production of pressed boards, in particular material boards produced from wood and / or other recycled agricultural products, such as particle boards, fiber boards, straw boards and chipboards, and plastic boards. Background Art

[0004] A device with a gluing device for gluing wood fibers is known from a marketed device for producing pressboard. The device also has a separation device for separating the transport air from the glued wood fibers. An arcuate channel is arranged between the separation device and the gluing device, which is used to guide the fiber flow with the glued wood fibers and has a curvature of 90°.

[0005] The object of the present invention is to design and construct an arcuate channel system, device, method of the type mentioned at the beginning, in which the deposition of adhesive and / or particles on the inner side of the wall of at least one arcuate channel for guiding a particle flow with glued particles can be prevented more simply and more efficiently. Summary of the invention

[0006] In the gluing device according to the invention, this technical object is achieved in that at least one protective particle feed channel is provided, which opens into the curved channel on one side from the radial outside with respect to the at least one bend.

[0007] Protective particles, in particular protective particles in the form of already dried glued particles, can be fed through the protective particle feed channel. The protective particles can guide the particle flow with the still sticky glued particles from the radially outer wall inner side to the bend. The protective particles can form a kind of "protective cushion" to a certain extent, on which the still sticky glued particles are carried (supported) through the bend. In this way, it can be avoided that the still sticky glued particles reach radially outwards to the corresponding radially outer wall inner side of the arc-shaped channel due to centrifugal forces and possibly deposit there.

[0008] The following inventive aspects are furthermore found in the present invention: In particular, the curved channel has inventive advantages, since it is possible to reduce the construction height of the device for providing the glued particles and / or to deflect the newly glued material in the conveying direction.

[0009] For this purpose, the arc channel usually has a rectangular cross section. In addition, in particular on one side of the start of the arc there is a feed piece for protecting the particles on the outside, which feed piece rests protectively against the wall along the larger radius. In order to prevent the newly glued particles from squeezing through the protective particles and reaching the wall of the arc channel, compressed air can be blown into the arc channel through the air holes of the arc channel installed at the outer radius. The air cushion thus formed leads to a sufficient distance from the wall of the arc channel until the glued particles bend backwards (the glued particles bend backwards).

[0010] Advantageously, the particle flow can have transport air which entrains the glued particles.

[0011] Advantageously, the particles can be fibers. For the fibers, a stable bond can be achieved by a corresponding glue application. The fibers can advantageously be so-called medium density fibers (MDF). The length of medium density fibers is usually in the order of magnitude of about 2 mm to 5 mm, in particular about 3 mm, and the thickness is in the order of magnitude of about 0.02 mm to 0.08 mm. Such fibers can be used to produce so-called MDF boards (medium density fiberboards) or HDF boards (high density fiberboards).

[0012] In the sense of the present invention, the term "air" refers to other types of gases besides room air, exhaust air etc., which are suitable for use as transport air, protective air, nozzle air etc. in the device for providing glued particles.

[0013] In an advantageous embodiment, viewed in the flow direction of the particle flow, at least one protective particle feed channel can open into the curved channel before or at the beginning of at least one bend. Thus, before at least one bend, the protective particles can already form a kind of "protective particle mat" at the radially outer inner side of the wall of the curved channel.

[0014] In another advantageous embodiment, at least one arcuate protective air feed channel can be introduced directly or indirectly into the arcuate channel. The arcuate protective air can be fed via the arcuate protective air feed channel. With the protective air, a particle flow with glued particles and possibly protective particles can be supported. With the protective air, a kind of "pressure cushion" or "protective air cushion" can be generated. At least one arcuate protective air feed channel can be led directly into the arcuate channel. In this way, no additional components are required. Alternatively, at least one arcuate protective air feed channel can be led into the arcuate channel indirectly, in particular by means of at least one arcuate protective air feed chamber.

[0015] In another advantageous embodiment, at least one arcuate protective air feed channel can be introduced directly or indirectly into the arcuate channel at the radially outer side with respect to at least one bend. The arcuate protective air feed channel can thus guide the arcuate protective air from the radially outer side into the arcuate channel. With the aid of the arcuate protective air, a corresponding protective air cushion can be realized, on which the still glued particles are guided through the arcuate channel on the radially outer side. With the aid of the protective air cushion, the risk of particles remaining hanging on the (more) radially outer wall inner side of the arcuate channel can be further reduced. In this way, a particle flow with glued particles and possible protective particles can be supported radially outer (radially outer side). It can thus be avoided that the particles are pressed against the inner wall of the arcuate channel due to centrifugal force.

[0016] Advantageously, approximately between 28,000 m³ and 32,000 m³, in particular approximately 30,000 m³, of arcuate shielding air can be fed in per hour via the at least one arcuate shielding air feed channel.

[0017] In another advantageous embodiment, at least one arcuate protective air feed channel can be introduced directly or indirectly into the arcuate channel in at least one bend. In this way, the deflection of the glued particles and possibly the protective particles radially outside relative to the bend in the direction of discharge from the arcuate channel can be supported by the protective air.

[0018] Advantageously, the imaginary axis of at least one arcuate protective air feed channel can be oriented approximately parallel to the imaginary axis of the arcuate channel on its outlet side. Here, the inlet of the arcuate protective air feed channel can point to the outlet side of the arcuate channel. In this way, the protective air cushion generated by the arcuate protective air can be accelerated in the flow direction of the particle flow with the glued particles in the region of the outlet of the arcuate channel. As a result, the viscous glued particles can be received by the protective air cushion radially outside in the curved portion of the arcuate channel and conveyed to the outlet side of the arcuate channel.

[0019] In another advantageous embodiment, at least one arc-shaped protective air feed channel can be introduced into the arc-shaped channel indirectly through at least one arc-shaped protective air feed chamber. The arc-shaped protective air can be introduced over a large area through the arc-shaped protective air feed chamber, especially in the region of the arc-shaped protective air supply chamber.

[0020] In another advantageous embodiment, a plurality of through holes can be arranged successively in the radial outer wall of the curved portion of the curved channel when viewed in the flow direction of the particle flow. The arc-shaped protective air can be introduced into the curved channel through the through holes. The arc-shaped protective air can be introduced into the curved channel in a targeted manner through a suitable arrangement of the through holes. The through holes can be implemented as vents or air gaps.

[0021] In another advantageous embodiment, the radial outer wall of the arcuate channel with respect to the bend may have at least one through-hole for arcuate protective air, which connects the arcuate channel with at least one arcuate protective air feed channel or possibly with at least one arcuate protective air feed chamber. With the aid of at least one arcuate protective air feed channel and possibly at least one arcuate protective air feed chamber, the protective air can be guided to the through-hole. Through the at least one through-hole, the arcuate protective air from at least one arcuate protective air feed channel or possibly at least one arcuate protective air feed chamber reaches the interior space of the arcuate channel.

[0022] In a further advantageous embodiment, the arcuate channel can have a rectangular or square cross section in the region of at least one bend. In this way, the particle flow can be better formed in the form of a "particle blanket". Correspondingly, a protective cushion consisting of protective particles and / or arcuate protective air can be formed uniformly between the particle blanket and the inner side of the radial outer wall of the arcuate channel.

[0023] In another advantageous embodiment, the arcuate channel can have a circular or oval cross section before and / or after at least one bend. The advantage of a circular or oval cross section is that further shielding air feeds, in particular shielding air nozzles, can be arranged more simply there. These further shielding air feeds can help: the particle flow can be kept as centrally as possible in the middle of the cross section of the corresponding central channel.

[0024] In a further advantageous embodiment, the curvature angle of at least one bend of the curved channel can be between about 80° and 100°, in particular about 90°. In this way, the particle flow can be diverted laterally with respect to the central channel of the gluing device. Thus, in addition to the gluing device, which may have a straight conveying channel, further device components, in particular a separation device for transporting air, can be arranged in a space-saving manner. As a result, the device for providing the gluing particles can be designed more compactly overall.

[0025] Advantageously, the arcuate channel can be arranged downstream of the gluing device and / or upstream of the separation device of the device for providing glued particles, viewed in the central flow direction of the particle stream.

[0026] Advantageously, the arc-shaped channel can have a cross-sectional area of ​​1.75 m×1.75 m in the region of its inlet and / or its outlet.

[0027] Advantageously, the curved channel can be connected with the gluing device by a straight conveying channel. In this way, the particles through gluing can be dried in the conveying channel, thereby further reducing the possibility that the particles keep adhering to the inner side of the wall when turning in the curved channel.

[0028] Advantageously, the imaginary axis of the protective particle feed channel is parallel to the imaginary axis of the arcuate channel on its inlet side. Here, the opening of the protective particle feed channel can point in the central flow direction. In this way, the protective particles can be introduced into the "blanket" with the still sticky glued particles and the inner side of the radially outer wall of the arcuate channel in a tangential flow direction. Thus, the protective particles can form a blanket-like "protective cushion" between the still sticky glued particles and the inner side of the radially outer wall of the arcuate channel.

[0029] Furthermore, according to the invention, the object is achieved in the device in that at least one protective particle feed channel is provided, which opens into the curved channel on one side from the radial outside with respect to the at least one bend.

[0030] Furthermore, the device can have at least one device for realizing a protective air jacket between the particle flow and the inner side of at least one wall of at least one protective channel for guiding the particle flow. With the aid of the protective air jacket, the probability of adhesive and / or in particular adhesively bonded particles being deposited on the inner side of the wall of the at least one channel can be reduced.

[0031] Advantageously, at least one separating device can have at least one cyclone separator. By means of the cyclone separator, the transport air and the agglomerated particles can be separated efficiently.

[0032] Furthermore, according to the invention, the object is achieved in a method for preventing the deposition of adhesive and / or particles in that in the curved channel, protective air is fed from the radially outer side with respect to at least one bend in a flow direction which is approximately parallel or oblique to the central flow direction of the particle flow consisting of the transport air with the adhesive particles, so that the protective particles form a kind of protective cushion between the particle flow and the inner side of at least one wall of the curved channel. The protective cushion can reduce the probability that the adhesive and / or particles come into contact with the inner side of at least one wall and possibly deposit there.

[0033] Furthermore, the features and advantages shown in connection with the curved channel system according to the invention, the device according to the invention and the method according to the invention and their corresponding advantageous design configurations apply with appropriate modifications; and vice versa. Of course, the individual features and advantages can be combined with one another, wherein further advantageous effects can be presented that exceed the sum of the individual effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Further advantages, features and details of the invention are given by the following description, in which embodiments of the invention are further explained with reference to the drawings. For a person skilled in the art, the features disclosed in the drawings, the description and the claims are suitable for individual consideration and other combinations can be meaningfully summarized. The drawings schematically show:

[0035] Figure 1 A device for providing glued fibers for producing fiberboard is shown, the device having a glueing device, a drying tower, an arc-shaped channel and a cyclone separator;

[0036] Figure 2 Show Figure 1 Longitudinal cross section of the arcuate channel of the device shown.

[0037] In the drawings, the same components are denoted by the same reference numerals. DETAILED DESCRIPTION

[0038] Figure 1 Shown is a method for providing Figure 2 The device 10 for producing glued particles in the form of particles 26 shown in FIG. The device 10 can be part of a device, not shown, for producing pressed boards, in particular for producing material boards such as particle boards, fiber boards, straw boards and chipboards and plastic boards from wood and / or other recycled agricultural products.

[0039] The device 10 comprises a gluing device 12 arranged functionally one after the other (in Figure 1 ), a drying tower 14 thereon, an arc-shaped channel system 15 with an arc-shaped channel 16, a connecting channel 18 and a cyclone separator 20. The cyclone separator 20 is spatially located next to the gluing device 12 and the drying tower 14.

[0040] In the gluing device 12, the granules 26 are sprayed with a suitable glue and fed to the drying tower 14. The granules 26 are conveyed here as a particle stream in the form of a particle flow by means of transport air 24, for example in the form of compressed air.

[0041] In the drying tower 14, the sticky glued particles 26 are dried. By means of the curved channel 16, the particle flow is diverted by 90° and fed via the connecting channel 18 to the inlet of the cyclone separator 20. In the cyclone separator 20, the transport air 24 is separated from the glued particles 26. The glued particles 26 are provided for further processing.

[0042] The arc channel is connected to the downstream drying tower 14. The arc channel 16 is located above the drying tower 14 in space. Figure 2 The arc-shaped channel 16 is further explained.

[0043] The arc channel 16 has a rectangular or square cross section. The circular cross section of the drying tower 14 is uniformly transformed into a rectangular cross section of the arc channel 16. The two sides of the arc channel 16 on its inlet side extend parallel to each other. The arc channel 16 has a 90° bend around an imaginary bending axis. The imaginary bending axis extends as a parallel line parallel to the above-mentioned two sides of the arc channel 16 and perpendicular to the central flow direction 32 of the glued particles 26 on the inlet side of the arc channel 16.

[0044] The curved channel 16 merges into a connecting channel 18 on its outlet side.

[0045] Viewed along the central flow direction 32, immediately before the bend of the arcuate channel 16, the arcuate channel system 15 protects the particle feed channel 108 from the radial outside on one side into the arcuate channel 16. In the region of its opening 110, the protective particle feed channel 108 extends approximately parallel to the central flow direction 32 at the radial outside of the arcuate channel 16 with respect to the bend. The opening 110 points along the central flow direction 32.

[0046] The already dried, glued protective particles 136 are fed to the curved channel 16 through the protective particle feed channel 108. The protective particles 136 are used to prevent the still-adherent glued particles 26 from being deposited on the inner side of the radially outer wall of the curved channel 16 when flowing through the curved channel 16. The protective particles 136 form a "protective particle mat" to a certain extent, on which a particle blanket made of the particle flow with still-adherent glued particles 26 is supported around the curved portion of the curved channel 16.

[0047] There are a plurality of through holes 112 on the radial outer wall of the curved portion of the arcuate channel 16. The region of the curved portion having the through holes 112 is surrounded radially on the outside by an arcuate protection air feed chamber 114 of the arcuate channel system 15. An arcuate protection air feed channel 116 of the arcuate channel system 15 leads into the arcuate protection air feed chamber 114. The imaginary axis of the arcuate protection air feed channel 116 extends parallel to the central flow direction on the outlet side of the arcuate channel 16. The central flow direction is indicated as "32B" on the outlet side of the arcuate channel 16.

[0048] About 30,000 m³ / h of arc-shaped protective air 138 are fed from the side in the form of compressed air through the arc-shaped protective air feed channel 116. The arc-shaped protective air 138 forms a protective air cushion 134, which prevents the glued particles 26 from reaching the radially outer wall inner side of the arc-shaped channel 16 due to centrifugal force. On the protective air cushion 134 and the protective particle cushion made of protective particles 136, the glued particles 26 are guided to the outlet of the arc-shaped channel 16. From there, the particle flow with the glued particles 26 reaches the connecting channel 18.

[0049] The connecting channel 18 opens into the inlet 118 of the cyclone separator 20. The agglomerated particles 26 pass through the connecting channel 18 and the inlet 118 into the cyclone separator 20.

[0050] The cyclone separator 20 is arranged vertically in space. By means of the cyclone separator 20, the transport air 24 is separated from the agglomerated particles 26 in a manner which is no longer of interest here. The cyclone separator has an outlet 120 for the agglomerated particles 26 on its spatial underside. The agglomerated particles 26 leave the cyclone separator 20 through the outlet 120 and can be collected for further use or directly transported.

[0051] List of reference numerals:

[0052] 10. Device for providing glued particles

[0053] 12 Gluing device

[0054] 14 Drying Tower

[0055] 15 Curved channel system

[0056] 16 Arc Channel

[0057] 18 Connection Channels

[0058] 20 Cyclone separator

[0059] 24 Transport Air

[0060] 26 Glued particles

[0061] 32 Center flow direction

[0062] 32B Center Flow Direction

[0063] 108 Curved channel protection particle feeding channel

[0064] 110 Protecting the access portion of the particle feeding channel

[0065] 112 Through hole of arc channel

[0066] 114 Arc-shaped protective air feed chamber

[0067] 116 Curved protective air feed channel

[0068] 118 Imported cyclone separator

[0069] 120 outlet cyclone separator

[0070] 134 Protective Air Cushion

[0071] 136 Protective particles

[0072] 138 Arc protection air.

Claims

1. An arcuate channel system (15) for deflecting a particle flow with glued particles (26) and transport air from a gluing device (12), particles being provided for producing press plates, the arcuate channel system having at least one arcuate channel (16) for guiding the particle flow, the arcuate channel having at least one bend with a radius, wherein: The arcuate channel (16) is connected to the gluing device (12) via a straight conveying channel and is provided with at least one protective particle feeding channel (108) for feeding protective particles (136), wherein the protective particle feeding channel is unilaterally connected to the arcuate channel (16) from the radially outer side of the at least one bend, before or at the beginning of the at least one bend, wherein the flow direction of the feeding of the protective particles (136) is approximately parallel to or inclined to the central flow direction of the particle flow.

2. The arc channel system (15) according to claim 1, characterized in that: The pressboard is a material board produced from wood and / or other recycled agricultural products.

3. The arc channel system (15) according to claim 2, characterized in that: The material board is a particle board.

4. The arc channel system (15) according to claim 2, characterized in that: The material board is a fiberboard.

5. The arc channel system (15) according to claim 2, characterized in that: The material board is a straw board.

6. The arc channel system (15) according to claim 2, characterized in that: The material board is a particle board.

7. The arc channel system (15) according to claim 1, characterized in that: The pressing plate is a plastic plate.

8. The arc channel system (15) according to any one of claims 1 to 7, characterized in that: At least one arcuate protective air feed channel (116) leads directly or indirectly into the arcuate channel (16).

9. The arc channel system (15) according to any one of claims 1 to 7, characterized in that: At least one arcuate protective air feed channel (116) is introduced directly or indirectly into the arcuate channel (16) radially outwardly with respect to the at least one bend.

10. The arc-shaped channel system (15) according to any one of claims 1 to 7, characterized in that: At least one curved protective air feed channel (116) is introduced directly or indirectly into the curved channel (16) in the at least one bend.

11. The arc channel system (15) according to any one of claims 1 to 7, characterized in that: At least one arc-shaped protective air feed channel (116) is indirectly introduced into the arc-shaped channel (16) via at least one arc-shaped protective air feed chamber (114).

12. The arc channel system (15) according to any one of claims 1 to 7, characterized in that: The radial outer wall of the arcuate channel (16) with respect to the curved portion has at least one through hole (112) for arcuate protective air (138), wherein the through hole connects the arcuate channel (16) with at least one arcuate protective air feeding channel (116) or can be connected with at least one arcuate protective air feeding chamber (114).

13. The arc channel system (15) according to any one of claims 1 to 7, characterized in that: Viewed along the flow direction (32) of the particle flow, a plurality of through holes (112) for arc-shaped protective air (138) are arranged successively in the radial outer wall of the curved portion of the arc-shaped channel (16).

14. The arc channel system (15) according to any one of claims 1 to 7, characterized in that: The arc-shaped channel (16) has a rectangular cross section at least in the region of the at least one bend.

15. The arc channel system (15) according to any one of claims 1 to 7, characterized in that: The arc-shaped channel (16) has a square cross section at least in the region of the at least one bend.

16. The arc channel system (15) according to any one of claims 1 to 7, characterized in that: The arc-shaped channel (16) has a circular or elliptical cross section before and / or after the at least one curved portion.

17. The arc channel system (15) according to any one of claims 1 to 7, characterized in that: The bending angle of at least one bending portion of the arc-shaped channel (16) is between 80° and 100°.

18. The arc channel system (15) according to claim 17, characterized in that: The bending angle of at least one bending portion of the arc-shaped channel (16) is 90°.

19. A device (10) for a plant for producing pressboard, for providing particles for producing pressboard, the device having at least one gluing device (12) for gluing the particles (26), having at least one curved channel (16) for guiding a particle flow with the glued particles (26), the curved channel having at least one bend with a radius, and the device also having at least one separation device for separating transport air (24) from the glued particles (26), wherein: The arc-shaped channel (16) is connected to the gluing device (12) through a straight conveying channel, and At least one protective particle feeding channel (108) is provided for feeding protective particles (136), and the protective particle feeding channel is unilaterally connected to the arc-shaped channel (16) from the radial outer side of the at least one bend, before or at the beginning of the at least one bend, wherein the flow direction of the feeding of the protective particles (136) is approximately parallel to or inclined to the central flow direction of the particle flow.

20. The device (10) according to claim 19, characterized in that The pressboard is a material board produced from wood and / or other recycled agricultural products.

21. The device (10) according to claim 20, characterized in that The material board is a particle board.

22. The device (10) according to claim 20, characterized in that The material board is a fiberboard.

23. The device (10) according to claim 20, characterized in that The material board is a straw board.

24. The device (10) according to claim 20, characterized in that The material board is a particle board.

25. The device (10) according to claim 19, characterized in that The pressing plate is a plastic plate.

26. A method for preventing the deposition of glue and / or particles (26) on the inner side of the wall of at least one curved channel (16) for conveying a particle flow with glued particles (26), the particles being provided for the production of press plates, wherein: The arc-shaped channel (16) is connected to the gluing device (12) through a straight conveying channel, and In the arcuate channel (16), protective particles (136) are fed in a flow direction in a direction that is approximately parallel to or inclined to a central flow direction (32) of the particle flow consisting of transport air (24) and glued particles (26) through at least one protective particle feeding channel (108) from the radially outer side of at least one bend, before or at the beginning of the at least one bend, so that the protective particles (136) form a protective cushion between the particle flow and the inner side of at least one wall of the arcuate channel (16), wherein the bend has a radius.

27. The method of claim 26, wherein: The pressboard is a material board produced from wood and / or other recycled agricultural products.

28. The method of claim 27, wherein: The material board is a particle board.

29. The method of claim 27, wherein: The material board is a fiberboard.

30. The method of claim 27, wherein: The material board is a straw board.

31. The method of claim 27, wherein: The material board is a particle board.

32. The method of claim 26, wherein: The pressing plate is a plastic plate.

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