EP3970867A2 - Dispositif d'épandage au moyen du vent - Google Patents

Dispositif d'épandage au moyen du vent Download PDF

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Publication number
EP3970867A2
EP3970867A2 EP21193000.3A EP21193000A EP3970867A2 EP 3970867 A2 EP3970867 A2 EP 3970867A2 EP 21193000 A EP21193000 A EP 21193000A EP 3970867 A2 EP3970867 A2 EP 3970867A2
Authority
EP
European Patent Office
Prior art keywords
wind
grit
scattering
air
belt
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21193000.3A
Other languages
German (de)
English (en)
Other versions
EP3970867A3 (fr
Inventor
Christoph Katzmann
Dieter Aengenvoort
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siempelkamp Maschinen und Anlagenbau GmbH and Co KG
Original Assignee
Siempelkamp Maschinen und Anlagenbau GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siempelkamp Maschinen und Anlagenbau GmbH and Co KG filed Critical Siempelkamp Maschinen und Anlagenbau GmbH and Co KG
Publication of EP3970867A2 publication Critical patent/EP3970867A2/fr
Publication of EP3970867A3 publication Critical patent/EP3970867A3/fr
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/10—Moulding of mats
    • B27N3/14—Distributing or orienting the particles or fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/12—Apparatus having only parallel elements
    • B07B1/14—Roller screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B4/00—Separating solids from solids by subjecting their mixture to gas currents
    • B07B4/02—Separating solids from solids by subjecting their mixture to gas currents while the mixtures fall
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
    • B07B7/06—Selective separation of solid materials carried by, or dispersed in, gas currents by impingement against sieves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B9/00—Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets
    • B07B9/02—Combinations of similar or different apparatus for separating solids from solids using gas currents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/18—Auxiliary operations, e.g. preheating, humidifying, cutting-off

Definitions

  • a wind scattering device is usually integrated into a grit system for the production of grit mats for the production of material panels, in particular wood-based panels.
  • wood-based panels means in particular chipboard made from wood chips. In principle, however, fibreboards made of wood fibers or annual plants and sometimes also artificial products are also included.
  • the mats of grit scattered on the scatter belt conveyor are e.g. B.
  • the quality of the wood-based panels produced depends largely on the quality or the properties of the mats of grit produced using the wind scattering device.
  • the grit is usually glued grit, e.g. B. glued chips that are fed from a grit bunker or dosing bunker of the wind spreading device.
  • a grit system can have several scattering devices or scattering heads, particularly when multi-layer grit mats are to be produced from two top layers (e.g. made of fine material) and a middle layer (e.g. made of coarse material).
  • the individual wind scattering devices are then arranged one behind the other along the conveying direction of the spreading belt conveyor, so that first a first covering layer is spread onto the spreading belt conveyor, then the middle layer is spread onto the first covering layer and then the second covering layer is spread onto the middle layer.
  • the wind scattering device according to the invention particularly preferably serves to produce covering layers within such a grit system.
  • the air flow generated in the wind scattering chamber separates the shavings in the wind scattering chamber, with coarser shavings falling near the air outlet unit, which can be an air outlet unit, for example, and finer shavings falling in the rear area, i.e. in the area of the wind scattering chamber facing away from the air outlet unit fall down.
  • the air outlet unit can be an air outlet unit, for example, and finer shavings falling in the rear area, i.e. in the area of the wind scattering chamber facing away from the air outlet unit fall down.
  • the air outlet unit can be an air outlet unit, for example, and finer shavings falling in the rear area, i.e. in the area of the wind scattering chamber facing away from the air outlet unit fall down.
  • the air outlet unit can be an air outlet unit, for example, and finer shavings falling in the rear area, i.e. in the area of the wind scattering chamber facing away from the air outlet unit fall down.
  • One or more fly chip screens can also be arranged in the wind scattering chamber in order
  • a wind scattering device is known in which several vertically arranged perforated plates are integrated into the air supply housing, which works as a diffuser.
  • the air is fed to the scattering chamber via the last perforated plate in the direction of flow, and there the particles brought in from above are sorted by the air streams according to their trajectories according to their size and fall onto the scattering belt conveyor.
  • this last perforated plate is also regarded as a series of outlet openings. Dust particles are in the DE 198 35 419 A1 discharged via discharge rollers or suction devices.
  • the object of the invention is to provide a wind scattering device of the type described in the introduction, with which the problems described are minimized and, in particular, turbulence due to air flows from the environment into the scattering chamber is prevented.
  • an ambient air barrier for the wind debris chamber is provided at least below the air outlet unit by means of an additional air feed.
  • An additional sealing of the wind spreading material chamber can be achieved in that a seal is created by a controlled air flow, which prevents the ingress of external air.
  • This additional air supply is directed in the area between the spreading material and the air outlet unit over the entire spreading material width in the direction of the suction. The flow is laminar and does not generate any turbulence on the mat surface, but has the advantage that it seals off the grit chamber below the air outlet unit from incoming or outgoing air.
  • part of the air volume flow can preferably be branched off from the air outlet unit by means of an air distribution element.
  • volume flow of the air supply can be adjusted.
  • the pre-distribution is formed by a preferably horizontally arranged distribution roller set.
  • the slot width between the distribution rollers is individually adjustable and that the slot width at least tends to increase in the direction of the coarse material discharge.
  • the grit thrown on them can either be ejected in a targeted manner into the nozzle air and/or thicker grit particles can be transported closer and closer to the coarse material discharge, which may be formed by a discharge screw. Particles up to a certain size are still thrown into the nozzle jet, while particles that are too large are removed in the coarse material discharge before they can interfere with the nozzle air discharge.
  • the distribution rollers can be constructed from many discs and/or spikes like similarly arranged spreading rollers in spreading systems without air separation.
  • At least one wall or ceiling element is formed by a belt running around deflection devices and a deflection device of the belt is adjacent to a suction duct for dust.
  • the wall or Tape sections forming ceiling sections run towards one another in the direction of the suction duct and thus contribute to transporting the deposited dust into the suction duct.
  • a deflection roller for example, can be used in a cost-effective manner as a deflection device. At least one of them has a motor drive that ensures that the belt that forms the wall or ceiling section rotates evenly.
  • This design is particularly effective if at least a first and a second wall or ceiling element are formed by a first and second belt running around deflection devices and that a deflection device of the first belt and a deflection device of the second belt are adjacent in such a way that a suction channel for dust is formed.
  • a cleaning device for at least one belt is provided in the suction channel.
  • the cleaning device preferably comprises a rotating brush whose bristle spacing allows clearance for the dust to pass out of the wind scattering chamber.
  • Such a rotating brush is easy to install and easy to replace in case of wear. The expense is minimal.
  • the brush can be both Clean the belts and bring the dust or glue particles into the suction channel.
  • the cleaning device also forms an air flow barrier.
  • a kind of labyrinth seal is created with a small distance between a parallel running belt and the mat surface or the spreading belt conveyor, which prevents increased air entry or exit into the wind spreading chamber. This avoids unwanted turbulence of the spreading material on the mat surface.
  • Such a section extends over a length of 0.2 to 1.0 m depending on the environmental influences.
  • the length of the parallel section can be calculated using virtual methods or determined in tests. The invention therefore ensures that leakage air no longer finds an opportunity to penetrate into the wind chamber via the spreading material that has already been spread. This avoids turbulence in the grit, which would render a panel unusable, and it can be sucked off at a higher air speed, which in turn has a positive effect on chip separation.
  • the distance can be adjusted via the height adjustment device depending on the circumstances.
  • the gap always has the desired minimum height of the order of 1 mm to 20 mm.
  • the section running parallel can be placed on the mat, so that a complete seal to the area outside the wind scattering chamber is achieved.
  • the belt is driven by a motor which is synchronized with the speed of the spreading belt conveyor.
  • the returning run of the belt used for the ceiling element can preferably be used as a conveyor belt for the grit in the grit bunker arranged above the wind scattering chamber.
  • the belt forming the ceiling element can thus easily take on a second task and transport the material inside the grit bunker up to the upper grit opening.
  • a grit system for the production of grit mats for the production of wood-based panels, in particular chipboard is shown.
  • This grit system has a grit bunker 1, which is designed as a metering bunker and the grit 39 z. B via stripping rollers or metering rollers 2a, 2b to a wind scattering device 3. With the wind scattering device 3, the grit is scattered on the scattering belt conveyor 4, on which a grit mat is formed, which is then in a press using pressure and heat to form a wood-based panel, z. B. chipboard is pressed.
  • Such a grit system usually has several wind scattering devices for generating several layers of a grit mat, e.g. B.
  • FIG. 1 only an area with a wind scattering device 3 for producing a covering layer of relatively fine chips is shown as an example.
  • This wind scattering device 3 has a wind scattering chamber 5 which has an upper grit opening 6 through which the grit enters the wind scattering chamber 5 from the grit bunker 1 .
  • the wind scattering device 3 has several fans 7 for generating air currents for separating the grit in the wind scattering chamber.
  • An air supply housing 8 is arranged between the fans 7 and the wind scattering chamber 5 , through which the air streams generated by the fans 7 are guided into the wind scattering chamber 5 .
  • the air currents in the wind scattering chamber 5 separate the chips, with coarser chips falling into the area of the wind scattering chamber 5 facing the air supply housing 8 (e.g. for the inner cover layer) and finer chips falling into the rear area of the wind scattering chamber 5 facing away from the air supply housing 8 fall down (e.g. for the outer cover layer).
  • screens 9 can be arranged, which are arranged transversely to the direction of flow and are equipped with vibrators and ensure optimal chip distribution and precise granulometric separation.
  • a distributing roller screen 10 with discharge screw 11 is provided above the trajectory.
  • a vibrating screen can also be provided instead of the distribution roller screen.
  • the distributor roller 10 or a corresponding vibrating z. B. lumps of glue are retained, which can then be removed with the discharge screw 11.
  • the grit is also distributed better than before via the distribution roller screen 10 into the wind flow of the air outlet unit 12, which can be an air outlet unit, for example.
  • the air outlet unit 12 connects to the air supply housing 8 in the direction of flow, which consequently forms the transition between the air supply housing 8 and the wind scattering chamber 5 .
  • the air streams consequently exit the end of the air supply housing through the air outlet unit 12 and from there into the wind scattering chamber 5 .
  • This air outlet unit 12 has a nozzle chamber 13 with a large number of outlet openings 14 arranged in columns and rows.
  • the air outlet unit 12 has a register unit 16 arranged downstream of the nozzle chamber 13 in the direction of flow, which has a plurality of register strips 17 assigned to the columns next to one another, each of which has a plurality of openings 18 assigned to the outlet openings 14 distributed over the height.
  • these register strips 17 are height-adjustable. This means that the air currents are not always over the full Output cross-section of the outlet openings, but - depending on the setting of the register strips 17 emerge.
  • the register strips 17 are arranged on a common carrier 19 which is provided with corresponding adjustment means 20 .
  • the adjustment is done manually, e.g. B. in the course of commissioning, z. B. screws, spindles or the like, but can also be provided with adjustable drives.
  • the air outlet unit 12 has a multiplicity of outlet pipes 21 which are assigned to the individual outlet openings 14, the outlet pipes 21 being arranged downstream of the register unit 16 in the direction of flow. The air enters the wind scattering chamber 5 from these outlet pipes 21 .
  • the fans 7 are designed as axial fans in the exemplary embodiment.
  • the air supply housing 8 is designed as a deflection housing in the exemplary embodiment. It has a vertical housing section and a horizontal housing section and a corresponding deflection section in between. Consequently, in the deflection section, the air flows are deflected by 90° from the vertical to the horizontal.
  • the flow conditions can be further optimized through the use of guide plates 25 and the diffuser plates. So are in the vertical Housing sections, which are each assigned to the individual fans 7, baffles 25 are arranged, which are aligned approximately parallel to the direction of flow and are consequently aligned in the embodiment in the vertical direction.
  • guide plates 25 can be provided at the nozzle outlet.
  • a suction channel 15 for dust particles that are too small is arranged on the side of the wind scattering chamber 5 opposite the air outlet unit 12 .
  • a first belt 29 circulating over deflection rollers 32 forms a first wall or ceiling element 27 and a second circulating belt 30 forms a second wall or ceiling element 28.
  • the belts 29, 30 can be made of metal or plastic, for example, and can extend over the entire width of the wind scattering chamber .
  • the wall or ceiling elements can also consist of several circumferential bands connected next to or behind one another.
  • the suction channel 15 is integrated between a deflection roller of the first circulating belt 29 and a deflection roller of the second circulating belt 30 .
  • This has the advantage that the chips and dust particles adhering to the first wall or ceiling element 27 and the second wall or ceiling element 28 are transported directly to the suction duct if the belts 29 and 30 are in the correct direction of rotation. There they are extracted and, if necessary, recycled.
  • a cleaning device in the form of a brush 33 is also helpfully arranged in the suction channel.
  • the brush can clean both belts 29,30. Your bristle spacing is designed so that the Suction of the dust from the wind scattering chamber 5 remains possible without any problems.
  • the brush also prevents strong air currents that could lead to unwanted turbulence in the area of the spreading material mat.
  • the first circulating belt 29 runs over a section parallel to the scatter belt conveyor 4 or to the grit mat 38 at a small distance. This creates a labyrinth seal for external air.
  • a height adjustment device indicated only by arrows 35, is provided. Two deflection rollers 32 pivot up or down about a radius center point in order to keep the belt taut.
  • an ambient air barrier for the wind grit chamber is provided at least below the air outlet unit by means of an additional air supply 36 .
  • the supply air volume is branched off from the wind scatter air and can be adjusted using a slider 40.
  • the supply air flows in the direction of extraction and is like a seal for external air. The uniform laminar flow avoids turbulence on the surface of the spreading material mat.
  • the circulating second belt 30 forming the cover element 28 is used in the return as a conveyor belt 34 for grit 39 in the dosing bunker 1 .
  • Upper spreading material opening 7 fans 8th air supply housing 9 Screens (fly chip screens) 10
  • Distribution roller screen, pre-distribution 11 Discharge screw, coarse material discharge 12 air outlet unit 13 nozzle chamber 14 exhaust ports 15 suction channel 16 register unit 17 tab strips 18 openings 19 carrier 20 adjusting means 21 outlet pipes 22 Vertical housing section 23 deflection section 24 Horizontal housing section 25 baffle 26 diffuser plate 27 First wall or ceiling element 28 Second wall or ceiling element 29 First circulating band 30 Second Circumferential Band 31 Parallel Band Section 32 Deflection device, deflection roller 33 cleaning device, brush 34 Conveyor belt, return run of the ceiling belt 35 height adjustment device 36 additional air supply 37 air distribution element 38 grit mat 39 grit 40 slider A Trajectory

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Coating Apparatus (AREA)
  • Treatment Of Fiber Materials (AREA)
EP21193000.3A 2020-09-17 2021-08-25 Dispositif d'épandage au moyen du vent Pending EP3970867A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102020005685 2020-09-17

Publications (2)

Publication Number Publication Date
EP3970867A2 true EP3970867A2 (fr) 2022-03-23
EP3970867A3 EP3970867A3 (fr) 2022-09-21

Family

ID=77499701

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21193000.3A Pending EP3970867A3 (fr) 2020-09-17 2021-08-25 Dispositif d'épandage au moyen du vent

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EP (1) EP3970867A3 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19835419A1 (de) 1998-08-05 2000-02-10 Kvaerner Panel Sys Gmbh Vorrichtung und Verfahren zur Windsichtung
DE102015112013A1 (de) 2015-07-23 2017-01-26 Siempelkamp Maschinen- Und Anlagenbau Gmbh Windstreuvorrichtung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2552662A1 (de) * 1975-11-24 1977-06-02 Baehre & Greten Mit windsichtung arbeitende einrichtung zum streuen eines vlieses aus fasrigen teilchen
GB9005806D0 (en) * 1990-03-15 1990-05-09 Pyrok Technology Limited Manufacture of bonded particle boards
DE10247412C5 (de) * 2002-10-11 2010-07-01 Siempelkamp Maschinen- Und Anlagenbau Gmbh & Co. Kg Anlage zum Beleimen von Fasern für die Herstellung von Faserplatten, insbesondere MDF-Platten und dergleichen Holzwerkstoffplatten
DE202008011509U1 (de) * 2008-08-29 2008-10-30 Binos Gmbh Vorrichtung zur Streuung eines Vlieses
DE102017124063A1 (de) * 2017-10-16 2019-04-18 Dieffenbacher GmbH Maschinen- und Anlagenbau Streuanlage und Verfahren zur Herstellung einer Streugutmatte im Zuge der Herstellung von Werkstoffplatten
DE202018102299U1 (de) * 2018-04-25 2019-06-28 Dieffenbacher GmbH Maschinen- und Anlagenbau Rückwand für eine Windstreukammer einer Streumaschine und Streumaschine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19835419A1 (de) 1998-08-05 2000-02-10 Kvaerner Panel Sys Gmbh Vorrichtung und Verfahren zur Windsichtung
DE102015112013A1 (de) 2015-07-23 2017-01-26 Siempelkamp Maschinen- Und Anlagenbau Gmbh Windstreuvorrichtung

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Publication number Publication date
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