EP3832239B1 - Séchoir circulaire - Google Patents

Séchoir circulaire Download PDF

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Publication number
EP3832239B1
EP3832239B1 EP20206954.8A EP20206954A EP3832239B1 EP 3832239 B1 EP3832239 B1 EP 3832239B1 EP 20206954 A EP20206954 A EP 20206954A EP 3832239 B1 EP3832239 B1 EP 3832239B1
Authority
EP
European Patent Office
Prior art keywords
work container
air
hot air
workpieces
container
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.)
Active
Application number
EP20206954.8A
Other languages
German (de)
English (en)
Other versions
EP3832239C0 (fr
EP3832239A3 (fr
EP3832239A2 (fr
Inventor
Rüdiger Böhm
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.)
Roesler Holding GmbH
Original Assignee
Roesler Holding GmbH
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 Roesler Holding GmbH filed Critical Roesler Holding GmbH
Publication of EP3832239A2 publication Critical patent/EP3832239A2/fr
Publication of EP3832239A3 publication Critical patent/EP3832239A3/fr
Application granted granted Critical
Publication of EP3832239C0 publication Critical patent/EP3832239C0/fr
Publication of EP3832239B1 publication Critical patent/EP3832239B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B15/00—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form
    • F26B15/26—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a helical path
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B15/00—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form
    • F26B15/02—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in the whole or part of a circle
    • F26B15/04—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in the whole or part of a circle in a horizontal plane
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
    • F26B21/04—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure partly outside the drying enclosure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/08—Humidity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/10—Temperature; Pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/06—Chambers, containers, or receptacles
    • F26B25/08—Parts thereof
    • F26B25/10—Floors, roofs, or bottoms; False bottoms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
    • F26B3/04—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour circulating over or surrounding the materials or objects to be dried

Definitions

  • the invention relates to a round dryer according to the preamble of claim 1.
  • Such round dryers are known from the prior art (cf. GB 715 863 A ) and cause the workpieces to rotate by vibrating the work container.
  • GB 715863 A and EP 0282937 A2 disclose various round dryers for drying workpieces.
  • Drying systems that work with hot air (working temperatures, depending on the system approx. 80-120° C and more) are known. The necessary effect can only be achieved with these systems by using considerable energy (mainly electrical current) and therefore a lot of heat and air, which results in a poor energy balance.
  • the use of dehumidified air and, on the other hand, closing the work container at its top can be sufficient to pass hot air through the work container at significantly reduced temperatures of a maximum of 75 ° C.
  • a closed circuit which feeds the air extracted from the work container to the heating device for dehumidification and heating so that it can be fed back into the work container, the energy requirement for drying can be drastically reduced (down to a third). , which simultaneously enables savings of up to 70% CO 2 compared to conventional drying applications.
  • the air circulation fan can increase the entry of air into the work container.
  • the work container can have thermal insulation, for example in the area of the peripheral wall, a lid and/or the bottom of the work container.
  • thermal insulation for example in the area of the peripheral wall, a lid and/or the bottom of the work container.
  • energy saving during drying can be significantly improved.
  • sound insulation can be achieved in this way, so that a soundproof cabin can be dispensed with.
  • the round dryer can be designed such that the outside of the working container reaches a maximum temperature of approximately 40 ° C during operation. This not only limits the heating energy required for operation but also ensures that Operating personnel cannot burn themselves when touching the work container. A protective fence or the like is therefore not necessary.
  • At least one heating air supply can be provided at the bottom of the work container. This allows the dehumidified heating air to flow through the work container from bottom to top. If two heating air supplies are provided diametrically opposite each other on the bottom of the work container, uniform air distribution is ensured.
  • At least one heating air outlet can be provided on the top of the work container, so that the dehumidified heating air can flow evenly through the work container from bottom to top and thereby heat and dry the workpieces. It can be advantageous here if the heating air supply(s) and the heating air discharge(s) are arranged offset from one another in a plan view, as this ensures that the dehumidified heating air is distributed as evenly as possible within the work container.
  • the conveying direction i.e. the direction in which the workpieces rotate helically within the working channel, and the flow direction of the heating air can run essentially transversely to one another, which ensures a uniform and good heat exchange.
  • the circulating air fan can generate an air flow that runs countercurrent to the conveying direction in order to achieve optimized drying.
  • a circulating air fan can in particular be adjustable in terms of speed, so that variable amounts of air can be introduced into the work container depending on the respective requirements.
  • a circulating air supply can be provided on a peripheral wall of the work container in order to blow circulating air into the workpiece channel.
  • the circulating air is supplied at least approximately tangentially, the injected circulating air is moved in the circumferential direction within the work container, so that it can sweep over the workpieces on the working channel which runs helically within the work container.
  • the heating air which is also introduced in the area of the container base, can be sucked in at a point where it has its highest temperature and its lowest moisture content.
  • the bottom of the working channel can be permeable to air in order to increase the drying effect.
  • the bottom of the working channel can have wire mesh or be made from wire mesh, which further promotes the drying process.
  • perforated sheets, mesh grids, expanded metal grids, structural sheets or the like can be provided.
  • the working channel can have a pre-drying zone in which a blow-off device is provided in order to blow off the workpieces with compressed air.
  • a blow-off device can advantageously be arranged when the workpieces enter the working channel, the bottom of the working channel in this area being designed to be impermeable to liquid in order to prevent the liquid from dripping onto the workpieces underneath impede.
  • it can also be advantageous to provide a separate water drainage in the bottom area of the blow-off device.
  • the working channel can have a step section, which ensures that the workpieces travel a free fall over a certain distance. This makes it possible for the workpieces to rotate or be turned, which is particularly advantageous for flat parts (e.g. coins) or for scooping parts.
  • All metals and their alloys can be used as materials for the workpieces, as can plastics, ceramics and wood. Stamped parts, cast parts, formed parts, but also additively manufactured workpieces are suitable as workpieces.
  • the drying process can be carried out without the use of desiccant (granules, textiles or the like), which means that there are no costs for procurement, replacement, disposal or maintenance.
  • desiccant granules, textiles or the like
  • the workpieces and their surroundings are also free of desiccant residues, so that no dust or air extraction is required.
  • a workpiece temperature of below approximately 45° C can be achieved after the drying process, which means that structural, structural or surface changes are excluded. There are also no changes to protective layers (corrosion protection) or optical changes in brightness and/or color.
  • the round dryer according to the invention is also particularly suitable for surface-sensitive workpieces, such as workpieces produced using additive processes.
  • the round dryer according to the invention can be provided with a control and a heating device with which the drying temperature can be variably set or regulated.
  • the dehumidified heating air can be provided by a condensate drying unit, which can in particular have a heat pump.
  • the figures show a round dryer 10 for drying workpieces, which has a basically cylindrical work container 12 in which a helically circumferential workpiece channel (not shown) is provided. Workpieces to be dried are introduced into the work container 12 or at the beginning of its workpiece channel through a workpiece inlet 14 provided on the outer wall of the work container. Due to vibration of the spring-mounted Working container 12 with the help of at least one unbalance motor, the workpieces then reach a workpiece outlet 16 on the underside of the outer wall of the working container 12.
  • the working channel itself is formed from polyurethane-coated wire mesh, which helically wraps around the inner circumference of the working container over approximately two and a half revolutions A distance of around 9.5 m runs around. It goes without saying that the length and width of the working channel as well as its coating is variable. Workpiece feeding can also take place through the top or a lid of the work container.
  • the top of the working container 12 is completely closed, which in the exemplary embodiment shown is achieved by a lid 18 which is screwed to the container wall in a heat-tight manner.
  • the lid can also be formed in one piece with the container wall.
  • the round dryer 10 shown in the figures has a heating device 20 in which heated and dehumidified air with a maximum temperature of 70 ° C is provided.
  • This dehumidified air is supplied from the heating device 20 via two air hoses 22 and 23 provided with thermal insulation and via thermally insulated pipes to a heating air supply on the floor 13 ( Fig. 3 ) of the work container 12.
  • the two heating air supply lines on the bottom 13 of the work container 12 are arranged diametrically opposite one another.
  • the supplied heated and dehumidified air flows through it in the vertical direction from bottom to top, which is facilitated by the air-permeable design of the working channel.
  • the heating air supply and the heating air outlets are arranged offset from one another when viewed in plan view and, in particular, are evenly distributed over the circumference.
  • a circulating air fan 30 which draws air from the floor 13 via an air hose 31 ( Fig. 3 ) of the work container 12 and blows it into the work container 12 in countercurrent to the conveying direction of the workpieces.
  • a circulating air supply 32 is provided on the peripheral wall of the work container 12, with which the circulating air can be blown at least approximately tangentially into the workpiece channel.
  • the circulating air supply 32 is located approximately in the middle of the work container, ie halfway up, so that warm heating air, which has been sucked in from the bottom of the work container, is introduced into the upper area of the work container in countercurrent.
  • a second closed air circuit is thus provided by the circulating air blower 30.
  • Reference numeral 36 denotes an electrical control cabinet.
  • a control for the round dryer can be provided in this control cabinet, with which, among other things, the speed of the unbalance motors can be controlled, the amplitude of the vibration of the work container can be measured and the processing of the air passed through the work container can be regulated.
  • the temperature of the workpieces in the working channel can be measured without contact and a monitoring device can be provided which outputs a signal when there are no longer any workpieces in the work container. This can prevent different batches from accidentally mixing.
  • a separating device can be provided in the area of the workpiece inlet 14 and/or in the area of the workpiece outlet 16, which prevents the escape of Heating air from the work container 12 is prevented.
  • Such a separating device can, for example, comprise a curtain or individual tabs made of plastic or rubber or the like.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Drying Of Solid Materials (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)

Claims (13)

  1. Séchoir circulaire (10) pour faire sécher des pièces à oeuvrer, comprenant un récipient de travail (12) fermé sur sa face supérieure, dans lequel les pièces à oeuvrer traversent dans une direction de transport un canal à pièces s'étendant en forme d'hélice, et comprenant un dispositif de chauffage (20) qui aspire de l'air du récipient de travail (12), le réchauffe et le déshumidifie,
    caractérisé en ce que
    le dispositif de chauffage (20) fournit l'air réchauffé et déshumidifié à une température maximale de 75° C et le renvoie dans le récipient de travail (12),
    et en ce qu'il est prévu, en supplément au dispositif de chauffage (20), au moins un ventilateur de circulation d'air (30).
  2. Dispositif selon la revendication 1,
    caractérisé en ce que
    le réservoir de travail (12) présente une isolation thermique.
  3. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que
    au moins une alimentation en air de chauffage, en particulier deux alimentations en air de chauffage diamétralement opposées, est/sont prévue(s) au fond (13) du récipient de travail (12).
  4. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que
    au moins une évacuation d'air de chauffage (24, 26), en particulier au moins deux évacuations d'air de chauffage diamétralement opposées, est/sont prévue(s) sur la face supérieure (15) du réservoir de travail (12).
  5. Dispositif selon les revendications 3 et 4,
    caractérisé en ce que
    l'alimentation en air de chauffage et l'évacuation d'air de chauffage (24, 26) sont disposées en décalage l'une par rapport à l'autre, en vue de dessus.
  6. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que
    la direction de transport et la direction d'écoulement de l'air de chauffage s'étendent transversalement l'une par rapport à l'autre.
  7. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que
    le ventilateur de circulation d'air (30) génère un flux d'air qui s'écoule à contre-courant de la direction de transport.
  8. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que
    sur une paroi périphérique du récipient de travail (12) est prévue une alimentation en air de circulation (32) permettant d'insuffler l'air de circulation en particulier au moins approximativement tangentiellement dans le canal à pièces.
  9. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que
    le fond du canal de travail est au moins partiellement perméable à l'air et présente en particulier un tissu de fils métalliques.
  10. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que
    le fond du canal de travail est revêtu de matière plastique.
  11. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que
    le canal de travail présente une zone de pré-séchage dans laquelle est prévu un moyen de soufflage.
  12. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que
    le canal de travail comprend une portion en gradin.
  13. Procédé de fonctionnement d'un séchoir circulaire selon la revendication 1, le séchoir circulaire fonctionnant de telle sorte que la face extérieure du récipient de travail (12) atteint une température maximale de 40 °C pendant le fonctionnement.
EP20206954.8A 2019-11-18 2020-11-11 Séchoir circulaire Active EP3832239B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019131105.5A DE102019131105A1 (de) 2019-11-18 2019-11-18 Rundtrockner

Publications (4)

Publication Number Publication Date
EP3832239A2 EP3832239A2 (fr) 2021-06-09
EP3832239A3 EP3832239A3 (fr) 2021-08-11
EP3832239C0 EP3832239C0 (fr) 2024-01-24
EP3832239B1 true EP3832239B1 (fr) 2024-01-24

Family

ID=73343928

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20206954.8A Active EP3832239B1 (fr) 2019-11-18 2020-11-11 Séchoir circulaire

Country Status (4)

Country Link
US (1) US11674753B2 (fr)
EP (1) EP3832239B1 (fr)
DE (2) DE102019131105A1 (fr)
ES (1) ES2972785T3 (fr)

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1191075A (en) * 1915-05-04 1916-07-11 Burt S Harrison Drier.
US2658285A (en) * 1949-09-24 1953-11-10 Cremer Gottfried Marius Josef Process and apparatus for the drying of ceramic goods
GB715863A (en) * 1952-07-09 1954-09-22 Ici Ltd Process and apparatus for the removal of water or other liquid from solid materials
US3315492A (en) * 1966-02-21 1967-04-25 Frick Co Continuous once through material treatment apparatus
US4237622A (en) * 1978-12-29 1980-12-09 Francis Theodore R Dryer using vibratory feeding
JPS6054588B2 (ja) * 1981-03-16 1985-11-30 宏祐 小野寺 スパイラルコンベヤ型フリ−ザ
IT1203369B (it) * 1987-03-17 1989-02-15 Reni Cirillo Srl Macchina a mibrazione per asciogare pezzi metallici mediante aria calda e materiale assorbente
IT1236729B (it) * 1989-10-30 1993-03-31 Mario Reni Macchina a vibrazione per la finitura, il lavaggio e l'asciugatura di pezzi metallici.
FR2666639A1 (fr) * 1990-09-10 1992-03-13 Aernout Bernard Dispositif de refrigeration et de sechage de produits consommables sensibles aux chocs et/ou a la compression.
DE4300595A1 (de) * 1993-01-13 1994-07-14 Fasti Farrag & Stipsits Ges M Verfahren zum Betrieb eines Trockners für pulver-, granulatförmige und schüttfähige Stoffe und ein nach dem Verfahren arbeitender Trockner
US5495864A (en) * 1993-04-25 1996-03-05 Matsushita Electric Works, Ltd. Apparatus for washing and drying discrete parts
US6457255B1 (en) * 2000-06-19 2002-10-01 Allan M. Carlyle Ring to ring gas processor/dryer
ITMI20020827A1 (it) * 2002-04-18 2003-10-20 Rollwasch Italiana Spa Macchina circolare per vibrofinitura con mezzi di lavaggio perfezionati
CN103727761A (zh) * 2013-12-17 2014-04-16 天津市国民制药机械有限公司 高温热泵螺旋干燥机
CN206622961U (zh) * 2016-12-13 2017-11-10 浙江中同科技有限公司 一种胶囊自动干燥抛光装置
CN106739468B (zh) * 2017-01-19 2019-03-26 南京索特包装制品有限公司 一种印刷机用热风循环系统
FI128391B (en) * 2019-01-14 2020-04-15 Solar Foods Oy Bioreactors for the cultivation of microorganisms

Also Published As

Publication number Publication date
EP3832239C0 (fr) 2024-01-24
DE102019131105A1 (de) 2021-05-20
EP3832239A3 (fr) 2021-08-11
ES2972785T3 (es) 2024-06-17
US20210148636A1 (en) 2021-05-20
DE202020005902U1 (de) 2023-02-10
EP3832239A2 (fr) 2021-06-09
US11674753B2 (en) 2023-06-13

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