EP0965808A1 - Moyens étanches pour supporter et entraíner des rouleaux de convoyage dans un four - Google Patents

Moyens étanches pour supporter et entraíner des rouleaux de convoyage dans un four Download PDF

Info

Publication number
EP0965808A1
EP0965808A1 EP99111093A EP99111093A EP0965808A1 EP 0965808 A1 EP0965808 A1 EP 0965808A1 EP 99111093 A EP99111093 A EP 99111093A EP 99111093 A EP99111093 A EP 99111093A EP 0965808 A1 EP0965808 A1 EP 0965808A1
Authority
EP
European Patent Office
Prior art keywords
rollers
roller
container
kiln
fastened
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.)
Withdrawn
Application number
EP99111093A
Other languages
German (de)
English (en)
Inventor
Roberto Zavatti
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.)
Tecnochimica Sassolese Srl
Original Assignee
Tecnochimica Sassolese Srl
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 Tecnochimica Sassolese Srl filed Critical Tecnochimica Sassolese Srl
Publication of EP0965808A1 publication Critical patent/EP0965808A1/fr
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0073—Seals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
    • F27B9/24—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor
    • F27B9/2407—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor the conveyor being constituted by rollers (roller hearth furnace)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
    • F27D21/02—Observation or illuminating devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/04—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity adapted for treating the charge in vacuum or special atmosphere
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D2099/0083—Drives; Auxiliary drives
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/02—Skids or tracks for heavy objects
    • F27D3/026—Skids or tracks for heavy objects transport or conveyor rolls for furnaces; roller rails

Definitions

  • the present invention relates to heat treatment of articles for modifying and improving their physical and structural characteristics.
  • the present invention relates to a device for supporting and driving rollers in a continuous roller kiln, with a seal around them.
  • the heat treatment is necessary in production of ceramic articles like tiles, sanitary fixtures, or in production of components of sintered ferrite used in electronics.
  • the heat treatment is used in many other cases.
  • One of the most used is a kiln equipped with a rollerway, in which the articles to be treated are introduced into the kiln and conveyed inside the kiln through the heat treatment chamber by a motorised rollerway.
  • the rollerway includes a plurality of rollers made of ceramic or metallic material, arranged horizontally, perpendicularly to the conveying direction and situated one beside another.
  • the rollers are driven into simultaneous rotation by driving groups.
  • roller holding slits Since it is impossible to situate driving groups inside a kiln due to high temperatures reached therein, the driving groups are situated outside the kiln and the ends of the rollers go out through suitable apertures made in the kiln transversal walls, called roller holding slits.
  • roller holding slits are usually made in both lateral walls of the kiln.
  • rollers are carried by idle supports situated outside the kiln.
  • roller holding slits diameters are much bigger than the corresponding rollers diameters, therefore, the roller holding slits set the heat treatment chamber in communication with the outside.
  • roller holding slits are normally closed by suitably shaped plugs of mineral fibre, which do not impede the rollers rotation, but do not manage to prevent sufficiently the communication between the heat treatment chamber and the outside.
  • the atmosphere in the heat treatment chamber is changed and devoid of oxygen, which is substituted by nitrogen or other inert gases.
  • roller holding slits although closed by the plugs, do not prevent a certain quantity of oxygen from passing inside the kiln, thus making it unsuitable for treatment of the above mentioned articles and therefore, considerably limiting its use field.
  • Still another drawback lies in the fact that the driving groups provided so far transmit the rotary movement to the rollers in a rather rigid way, often causing displacement of the rollers with respect to their ideal rotation axes and influencing the conveying precision.
  • the present invention was evolved with the general object of proposing a device for supporting and driving rollers in a roller kiln, with a seal which avoids the above mentioned disadvantages, guaranteeing best heat insulation of the kiln as well as its perfect tightness with respect to possible emission of toxic substances and possible contamination by substances present outside.
  • Another object of the present invention is to propose a device as described above, which allows an easy access to the rollers for their inspection or maintenance.
  • a further object of the present invention is to propose a device, which allows to drive the rollers guaranteeing their constant alignment, independently from the temperature and load conditions.
  • the reference numeral 1 generally designates a heat treatment chamber of a rollerway equipped kiln or of a roller dryer.
  • the kiln, or dryer only some parts of which are shown for sake of clarity, is indicated by 100.
  • the heat treatment chamber 1 is obtained according to known techniques and from known materials.
  • the heat treatment chamber 1 features a refractory structure including a first lateral wall 2, equipped with a first plurality of roller holding slits 4, and a second lateral wall 3 ( Figure 4), facing the first wall 2 and equipped with a second plurality of roller holding slits 5.
  • the refractory structure is contained within an external metallic structure, whose corresponding lateral walls 2a and 3a, facing each other, are seen in Figure 1 and Figure 4, respectively.
  • the heat chamber is equipped with a plurality of transfer rollers 6, arranged side by side, substantially horizontally, perpendicular to a transfer direction of articles to be baked or dried.
  • the rollers 6 are driven into axial rotation to transfer the above mentioned articles inside the kiln 100.
  • terminal portions namely a driven terminal portion 6a and idle terminal portion 6b, respectively, of each of the rollers 6 extend outside the heat chamber 1 through the corresponding roller holding slits, first 4 and second 5, respectively.
  • roller holding slits 4, 5 of each pair are aligned and obviously, the number of the first roller holding slits 4 and the second roller holding slits 5 is equal to the number of rollers 6 in the heat chamber 1.
  • the proposed device 10 for tight supporting and driving rollers 6 includes a first box-like enclosing container 11, which contains the driven terminal portions 6a of the rollers 6 (see Figure 1).
  • the first container 11 is fastened to the metallic wall 2a in the region of the first roller holding slits 4.
  • the first container 11 has also a plurality of through holes 13, substantially coaxial with the rollers 6 and located in its fore surface.
  • the number of the through holes 13 is equal to the number of rollers 6, and consequently, to the number of the first roller holding slits 4.
  • First support means 30 for the driven terminal portions 6a are situated inside the first enclosing container 11.
  • the first support means 30 include, for each roller 6, a pair of discs 31, 32 (see Figure 2), idle on their axes, arranged side by side directly below the roller 6 and carried rotatably by a support 33 fastened to the base 11b of the first container 11.
  • the axes of the discs 31, 32 are parallel to the axis of the roller 6.
  • the discs 31, 32 freely support the driven terminal portion 6a lying thereon.
  • the discs 31, 32 support the cup 7 fastened to the driven terminal portion 6a, however, this does not cause particular constructive or functional differences.
  • the device 10 includes also means 40 for transmitting rotating movement to the rollers 6.
  • the transmission means 40 situauted substantially coaxial with the rollers 6, are fastened to the rear surface 7a of each cup 7 and extend outwards from the first container 11 through the through holes 13.
  • the transmission means 40 include for each roller 6:
  • Suitable motor means are mechanically connected to the cogwheels 44 in known and not shown way.
  • Tight seal closing means 14, coaxial with the small shaft 41, are provided in the region of each through hole 13 for sealing the first container 11.
  • the tight closing means 14 include a ring-like seal made of a suitable heat-resistant material and equipped with a shoulder 14a, also ring-like, which prevents the seal from going out of the relative through hole 13.
  • the door 17a allows the access to the inside of the first container 11 for inspection and maintenance.
  • the device 10 includes also a second box-like enclosing container 15 for the idle terminal portions 6b of the rollers 6 (see Figures 3, 4).
  • the second enclosing container 15 is fastened to the lateral metallic wall 3a, in the region of the second roller holding slits 5.
  • the second enclosing container 15 is provided with a front opening 18, which allows access to the rollers 6, and with a corresponding removable tight closure door 18a fastened to the second container 15 by a plurality of fasteners 20.
  • the door 18a gives the access to the inside of the second container 15 for maintenance and substitution of the rollers 6.
  • a gasket 18b guarantees the tightness of the door 18a.
  • the door 18a features also a plurality of tight closed windows 19 made of oven glass, situated substantially at the level of the rollers 6 for allowing inspection inside the second container 15.
  • Second support means 50 for idle terminal portions 6b of the rollers 6 are situated inside the second container 15.
  • the second support means include, for each roller, a pair of discs 51, 52, idle on their axes, arranged side by side directly below the corresponding roller 6 and rotatingly carried by a support 53 fastened to the base 15b of the second container 15.
  • the axes of the discs 51, 52 are parallel to the axis of the roller 6, therefore the idle terminal portions 6b of the rollers 6 lie, freely supported, on the discs 51, 52.
  • the first enclosing container 11 is completely closed and separated from outside, since the closing door 17a of the opening 17 is installed and the annular seal 14 prevents materials present inside the first container 11 from passing through the holes 13.
  • the second enclosing container 15 is completely closed and separated from outside, since the closing door 18a of the opening 18 is mounted and kept tightly closed by the corresponding fasteners 20.
  • the inside environment of the second container 15, which communicates directly with the heat chamber 11 is completely separated from the outer environment, and that is why nothing leaks outside, and no oxygen or other undesired substances enter the heat chamber 1 from outside.
  • the above mentioned motor means drive the rollers 6 by the respective cups 7, through the cogwheels 44, small shafts 41 and double Cardan joints 45.
  • Cardan joints fulfill a very important task of keeping the rotation axis of each roller 6 independent from the axis of the relative group small shaft 41 - cogwheel 44.
  • rollers 6 This allows the rollers 6 to rotate perfectly about the axis, since this axis is defined only by the position of the first support means 30 and the second support means 50, and therefore to transfer the articles to be treated in best way.
  • the main advantage of the present invention lies in the fact that the roller kiln or drier, equipped with the proposed tight sealed supporting and driving device, is very heat-tight and prevents materials present in the heat chamber from going outside, while protecting the heat chamber from infiltration of oxygen or other undesired substances entering from outside.
  • Another advantage of the present invention derives from the fact that the rollers are easily accessible for inspection, maintenance and substitution.
  • a further advantage of the present invention lies in fact that the device drives the rollers in such a way that they are constantly aligned, independently from the temperature or load conditions.
EP99111093A 1998-06-18 1999-06-17 Moyens étanches pour supporter et entraíner des rouleaux de convoyage dans un four Withdrawn EP0965808A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT98BO000378 IT1306298B1 (it) 1998-06-18 1998-06-18 Dispositivo per il supporto e la movimentazione a tenuta dei rulli ditrasporto di un forno a rulli
ITBO980378 1998-06-18

Publications (1)

Publication Number Publication Date
EP0965808A1 true EP0965808A1 (fr) 1999-12-22

Family

ID=11343250

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99111093A Withdrawn EP0965808A1 (fr) 1998-06-18 1999-06-17 Moyens étanches pour supporter et entraíner des rouleaux de convoyage dans un four

Country Status (2)

Country Link
EP (1) EP0965808A1 (fr)
IT (1) IT1306298B1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1403604A1 (fr) * 2002-09-26 2004-03-31 IPEG S.p.A. dell'Ing. Mauro Poppi Four à rouleaux
FR2894636A1 (fr) * 2005-12-14 2007-06-15 Yves Gersent Agencement de deux arbres aptes a etre mis en rotation.
WO2010124781A3 (fr) * 2009-04-29 2011-08-11 Eisenmann Ag Four de fabrication de cellules photovoltaïques en couches minces

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2175834A (en) * 1938-09-30 1939-10-10 Westinghouse Electric & Mfg Co Heat treating furnace
US4013403A (en) * 1975-12-08 1977-03-22 Pullman Incorporated Support means for a roller hearth in a kiln
FR2470350A1 (fr) * 1979-11-26 1981-05-29 Heimsoth Ind Tunnel Ofenbau Four de cuisson, en particulier four pourvu de rouleaux transporteurs
US4500287A (en) * 1982-11-15 1985-02-19 Carfer S.R.L. Roller table for single-layer ceramic kilns in general
EP0332926A2 (fr) * 1988-03-15 1989-09-20 NUOVA MATRIX S.r.l. Four à passage continu pour le frittage de poudres métalliques pressées
DE4228006A1 (de) * 1992-08-24 1994-03-03 Ngk Insulators Ltd Rollenherd-Durchlaufofen
DE29613956U1 (de) * 1996-08-12 1996-11-07 Schwartz Rolf Rollenherdofen

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2175834A (en) * 1938-09-30 1939-10-10 Westinghouse Electric & Mfg Co Heat treating furnace
US4013403A (en) * 1975-12-08 1977-03-22 Pullman Incorporated Support means for a roller hearth in a kiln
FR2470350A1 (fr) * 1979-11-26 1981-05-29 Heimsoth Ind Tunnel Ofenbau Four de cuisson, en particulier four pourvu de rouleaux transporteurs
US4500287A (en) * 1982-11-15 1985-02-19 Carfer S.R.L. Roller table for single-layer ceramic kilns in general
EP0332926A2 (fr) * 1988-03-15 1989-09-20 NUOVA MATRIX S.r.l. Four à passage continu pour le frittage de poudres métalliques pressées
DE4228006A1 (de) * 1992-08-24 1994-03-03 Ngk Insulators Ltd Rollenherd-Durchlaufofen
DE29613956U1 (de) * 1996-08-12 1996-11-07 Schwartz Rolf Rollenherdofen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1403604A1 (fr) * 2002-09-26 2004-03-31 IPEG S.p.A. dell'Ing. Mauro Poppi Four à rouleaux
FR2894636A1 (fr) * 2005-12-14 2007-06-15 Yves Gersent Agencement de deux arbres aptes a etre mis en rotation.
WO2010124781A3 (fr) * 2009-04-29 2011-08-11 Eisenmann Ag Four de fabrication de cellules photovoltaïques en couches minces

Also Published As

Publication number Publication date
ITBO980378A1 (it) 1999-12-18
IT1306298B1 (it) 2001-06-04

Similar Documents

Publication Publication Date Title
US3867748A (en) Supporting and driving frangible rollers
US4417722A (en) Vacuum furnace for heat treatment
EP0965808A1 (fr) Moyens étanches pour supporter et entraíner des rouleaux de convoyage dans un four
WO2017134309A1 (fr) Appareil pour le séchage et/ou la torréfaction de fèves ou d'éclats
JP2022150899A (ja) 連続焼成システム
US5266027A (en) Roller-hearth continuous furnace
US3988012A (en) Rotary hearth
JPH0790352A (ja) 熱処理炉におけるシール装置
JP2010043816A (ja) 加熱炉用搬送ローラ支持装置
RU2327746C2 (ru) Способ и устройство для термической обработки, в частности, металлических изделий
JP2005214453A (ja) 雰囲気加熱炉
US6133551A (en) Kiln
CN210602787U (zh) 一种高密封性梭式窑炉
KR19990037034U (ko) 크린컨베이어열경화건조로
PL192415B1 (pl) Piec obrotowy
KR100637274B1 (ko) 진공침탄로에서의 침탄트레이 이송장치
GB2121935A (en) Vacuum furnace for heat treatment
JP6878661B1 (ja) 雰囲気加熱炉用搬送ローラ支持装置
CN109141027B (zh) 多功能窑炉及其使用方法
JP6942276B1 (ja) ローラ式搬送装置
US2916277A (en) Heating apparatus
CN208091210U (zh) 一种搅拌充分的冶金炉
EP1146306A1 (fr) Four discontinu
SU845962A1 (ru) Печь дл термической обработкиКОлЕц
SU1025743A1 (ru) Кольцева печь дл нагрева цилиндрических изделий

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

AKX Designation fees paid
REG Reference to a national code

Ref country code: DE

Ref legal event code: 8566

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20000624