EP1747416B1 - System for detecting roller breakage in a tunnel kiln - Google Patents

System for detecting roller breakage in a tunnel kiln Download PDF

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Publication number
EP1747416B1
EP1747416B1 EP05747546A EP05747546A EP1747416B1 EP 1747416 B1 EP1747416 B1 EP 1747416B1 EP 05747546 A EP05747546 A EP 05747546A EP 05747546 A EP05747546 A EP 05747546A EP 1747416 B1 EP1747416 B1 EP 1747416B1
Authority
EP
European Patent Office
Prior art keywords
roller
breakage
bar
kiln
warning circuit
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.)
Not-in-force
Application number
EP05747546A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1747416A1 (en
Inventor
Giuseppe Pifferi
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.)
Sacmi Forni SpA
Original Assignee
Sacmi Forni SpA
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 Sacmi Forni SpA filed Critical Sacmi Forni SpA
Priority to PL05747546T priority Critical patent/PL1747416T3/pl
Publication of EP1747416A1 publication Critical patent/EP1747416A1/en
Application granted granted Critical
Publication of EP1747416B1 publication Critical patent/EP1747416B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/40—Arrangements of controlling or monitoring devices
    • 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
    • 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
    • F27D21/04—Arrangements of indicators or alarms

Definitions

  • the present invention relates in general to a system for monitoring correct operation of a tunnel kiln, used for example to fire ceramic articles, and in particular to a system for checking the integrity of the conveyor which advances the articles within the kiln.
  • the kilns used to fire ceramic articles comprise a tunnel within which a motorized roller conveyor is arranged to advance the articles to be fired within the kiln.
  • the ends of the conveyor rollers project from the tunnel and are supported at one end by idle wheels and at the opposite end by a drive system which rotates the rollers.
  • a first known system consists of positioning, between the tunnel entry and exit, laser beams, typically three equidistant laser beams, lying just below the plane in which the roller conveyor lies. In this manner when a roller breaks, the two roller portions, which incline to the conveyor plane, intercept at least one of the laser beams. This interception of the laser beam by at least one of the portions activates a warning system which warns the user of roller breakage.
  • laser beams typically three equidistant laser beams
  • a second known system consists of combining with the conveyor a circuit for sensing and indicating roller breakage, comprising a conductor cable which rests tautly above the free end of the conveyor rollers and is maintained at a determined voltage by usual means.
  • a plurality of earthing elements are positioned equidistantly above the plane in which the rollers lie, along the line of the kiln. When a roller breaks, the two portions incline because of the moment generated about the support point. Hence the end of the roller lifts the conductor cable to bring it into contact with the earthing elements. In this manner the electrical characteristics of the sensing circuit change to trigger a roller breakage alarm signal.
  • Document JP4036588 discloses a roller breakage detector for roller kiln wherein a roller breakage accident is detected by an electric detecting circuit associated to an end of each roller.
  • each roller which comprises a metallic support shaft and a metallic collar, has a wire connected through a lead wire to the positive side of a DC power supply, while the collar is grounded.
  • a detecting circuit is thus constructed in which both electrodes of the power supply are connected to each other through a normally open switch constituted of the wire and the collar.
  • the switch of the detecting circuit relevant to the unit containing the broken roller is closed, and an electric current flows In the circuit, operating an alarm indicating the breakage of the roller.
  • Document JP11132666 discloses a roller breakage detector for roller kiln wherein a roller breakage accident is detected by an electric optical circuit associated to an end of each roller.
  • the ends of the rollers are provided with shielding plates, established orthogonally to the axial lines of the rollers, so as to be arrayed and positioned respectively on one line among a multitude of pieces of arrayed rollers.
  • a light beam is provided near the light shielding plates, and it is projected from a projector against a photo detector in parallel to respective light shielding plates toward the lengthwise direction of the kiln.
  • the shielding of the light beam which is caused by the light shielding plate of a broken roller deviated from the normal position of the roller, is detected as the break of the roller.
  • the object of the present invention is therefore to overcome the stated drawbacks within the context of a simple, rational and reliable solution.
  • the invention attains said object in accordance with claim 1.
  • the invention provides a system for detecting roller breakage comprising a warning circuit with which means are associated for exerting on the free end of each roller a force of predetermined sense and direction, to activate said warning circuit if one of the conveyor rollers breaks.
  • said force is directed upwards, its modulus having a value such as not to cause roller lifting during normal kiln operation, but sufficient to cause substantial displacement of the roller portion in case of roller breakage.
  • said force is a mechanical force and said means comprise a compressed elastic spring which acts on the free end of the roller via a wheel.
  • said force is electromagnetic.
  • each roller presents at its end a metal portion, said means comprising a magnet arranged to interact with said metal portion to exert on the end of each roller an attraction force such as to cause substantial displacement of the end of the roller in case of roller breakage.
  • the extent of the force exerted by said magnet must not however be sufficient to cause roller displacement during normal operation, but sufficient to cause displacement of a portion thereof in case of breakage.
  • said warning circuit can be of electrical type or of optical type depending on the actual embodiment.
  • Figure 1 shows a tunnel kiln 1, the interior of which carries a conveyor 2 for advancing the articles to be fired through the kiln.
  • the conveyor 2 comprises a plurality of rollers 3, which in the illustrated embodiment are made of amagnetic material and are internally hollow. However in other embodiments the invention can be used with rollers of different technical and constructional characteristics, for example be neither of amagnetic material nor hollow.
  • each roller emerges from the side walls 200 of the kiln through holes 6.
  • the holes 6 open into the outer side of the wall 200 and are aligned with cavities 66, coaxial thereto and of greater diameter, provided in an outer infill layer 77.
  • the cavities 66 are partly filled with loose ceramic fibres 7 the purpose of which is to thermally insulate the kiln interior from the external environment and to provide a pneumatic seal.
  • each roller is associated with drive means 8, of known type, which rotate the rollers, whereas the end 30 of each roller is supported by idle wheels 5. Said idle wheels are in contact with a spiral 28 mounted on the end 30 of each roller 3.
  • each roller With the free end 30 of each roller there is associated a system for detecting breakage of rollers of the conveyor 2, comprising a warning circuit 9 and means 10 for exerting on the end of each roller a force sufficient, in case of roller breakage, to cause substantial displacement of that roller portion comprising said free end 30.
  • the system for detecting breakage of the rollers 3 comprises ( Figure 3) a warning circuit 9, of electrical type, consisting of a metal bar 90 positioned below the plane in which the roller table 2 lies and electrically connected to earth.
  • a disc 11 of electrically conductive material is positioned below the bar 90 in correspondence with each roller 3, and is maintained at a determined electrical voltage by a usual voltage generator 12.
  • the disc 11 is associated with said means 10 for exerting a force on the free end 30 of the roller.
  • said means 10 comprise an idle wheel 13 maintained resting against the lower surface of each roller by a spring 14.
  • the spring 14 is inserted into a support 15 rigid with the side infill 77 of the kiln.
  • the upper end of the spring 14 carries the disc 11, from the upper surface of which there branches a vertical rod 16 which passes through said bar 90 and supports at its upper end a fork 17 with which the wheel is associated.
  • FIGS 6 and 7 show a variant of the invention in which the warning circuit is not of electrical but of optical type.
  • the warning circuit is not of electrical but of optical type.
  • those components identical to those already described in the first embodiment of the invention are indicated by the same reference numerals.
  • the wheel 13 is associated with the spring 14 via a prismatic part 18 presenting an elongate through hole 19 ( Figure 7).
  • a transmitter 21 and receiver 22 for a laser beam 210 Positioned at opposite ends of the kiln, or of that kiln part to be monitored, there are a transmitter 21 and receiver 22 for a laser beam 210 which passes though all the mutually aligned holes 19. In this manner, if one of the rollers 3 breaks, the part 18 is pulled upwards by the force exerted by the spring 14, to intercept the laser beam 210a and interrupt signal reception by the receiver. This latter is connected to usual acoustic and/or light emitting warning devices, not shown, which warn the operator of the need to intervene.
  • FIGS 8, 9 and 10 show a second embodiment of the invention.
  • those components described in the first embodiment are indicated by the same reference numerals.
  • Said means 24 for exerting a force on the free end of the roller comprise a horizontal bar 25 positioned above the plane in which the roller table lies.
  • said bar 25 presents a cylindrical cavity 26, the base of which is perforated.
  • a cylindrical permanent magnet 27 arranged to exert a magnetic attraction force on the underlying roller 3. The extent of this force is such as not to lift the roller 3 during normal kiln operation but to lift an end portion of the roller if it breaks.
  • a spiral 28 ( Figure 10) of metal material able to interact with the permanent magnet 27.
  • the warning circuit 23 for sensing any breakage of one of the rollers 3 is also associated with said means 23.
  • the warning circuit 23 comprises a plurality of electrically conductive plates 29 fixed above said bar 25 carrying the magnets 27, a layer of electrically insulating material 32 being interposed between said plates 29 and said bar 25.
  • Each plate 29 has a length slightly less than the distance between the axes of the holes 26 of the bar 25.
  • the ends of each plate are U-shaped and partly extend above said holes 27 in which the magnets 27 are inserted.
  • the magnets 27 are normally rigid with the end portions of said plates 29, to ensure electrical connection between them.
  • the two plates 29 at the end of the bar 25 are connected to a current generator 33 such that the plates 29 are traversed by electric current. If a roller breaks, the end of the roller approaches the magnet 27, the magnetic attraction between the spiral 28 mounted on the roller end 30 and the magnet being such as to detach the magnet from the overlying plates and draw it towards the bottom of the cavity 26, to hence interrupt current passage through the plates 29.
  • the interruption in current passage is sensed by a suitable ammeter, not shown, connected to an acoustic and/or light emitting warning device provided to warn the operator of roller breakage, but not shown, being of known type.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Tunnel Furnaces (AREA)
  • Control Of Conveyors (AREA)
EP05747546A 2004-05-21 2005-05-04 System for detecting roller breakage in a tunnel kiln Not-in-force EP1747416B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL05747546T PL1747416T3 (pl) 2004-05-21 2005-05-04 Układ wykrywania złamania wałka w piecu tunelowym

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000060A ITRE20040060A1 (it) 2004-05-21 2004-05-21 Sistema per la rilevazione della rottura dei rulli di un forno a tunnel
PCT/EP2005/004958 WO2005114081A1 (en) 2004-05-21 2005-05-04 System for detecting roller breakage in a tunnel kiln

Publications (2)

Publication Number Publication Date
EP1747416A1 EP1747416A1 (en) 2007-01-31
EP1747416B1 true EP1747416B1 (en) 2007-11-21

Family

ID=34969035

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05747546A Not-in-force EP1747416B1 (en) 2004-05-21 2005-05-04 System for detecting roller breakage in a tunnel kiln

Country Status (9)

Country Link
EP (1) EP1747416B1 (es)
CN (1) CN100516745C (es)
BR (1) BRPI0511020A (es)
DE (1) DE602005003466D1 (es)
ES (1) ES2296185T3 (es)
IT (1) ITRE20040060A1 (es)
PL (1) PL1747416T3 (es)
PT (1) PT1747416E (es)
WO (1) WO2005114081A1 (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210116042A (ko) * 2020-03-17 2021-09-27 주식회사 포스코 롤러 변형 상태 검사 장치 및 그 방법

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102435067B (zh) * 2012-01-07 2013-10-30 广东中窑窑业股份有限公司 一种辊道窑断棒报警系统
CN102538498B (zh) * 2012-02-14 2013-12-25 广东中鹏热能科技有限公司 窑炉断辊位置检测装置
CN103776273B (zh) * 2014-01-24 2016-04-13 广东风华高新科技股份有限公司 窑炉辊道装置及其断棒检测报警装置
CN105300097B (zh) * 2015-10-30 2017-10-31 中国电子科技集团公司第四十八研究所 一种辊道窑辊棒检测装置
CN107606942B (zh) * 2017-07-31 2019-12-13 中国电子科技集团公司第四十八研究所 一种辊道炉的辊棒检测系统及检测方法
IT201800001709A1 (it) * 2018-01-24 2019-07-24 Giuseppe Bastardi Sistema per il rilevamento della rottura dei rulli di trasportatori continui a rulli, particolarmente per forni ed essiccatoi per l'industria ceramica.
CN109696060A (zh) * 2019-01-31 2019-04-30 江苏翔鹰新能源科技有限公司 气氛炉烧结炉高温环境下辊棒断棒检测装置及气氛炉
IT201900005992A1 (it) * 2019-04-17 2020-10-17 G P Service S R L Apparato per rilevare e comunicare la rottura di rulli in un trasportatore a rulli

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0387592A (ja) * 1989-08-29 1991-04-12 Ngk Insulators Ltd ローラーハースキルンのローラー折損検出法
JPH0436588A (ja) * 1990-04-19 1992-02-06 Takasago Ind Co Ltd ローラハースキルンのローラ折損検知装置
JP2500015B2 (ja) * 1991-12-24 1996-05-29 日本碍子株式会社 ロ―ラハ―スキルンのロ―ラ折れ検知装置
JP3156941B2 (ja) * 1992-07-20 2001-04-16 高砂工業株式会社 ローラハースキルンにおけるローラの異常検知装置
JP3355810B2 (ja) * 1994-10-13 2002-12-09 株式会社村田製作所 連続式熱処理炉のローラ折損検知装置
CN2206435Y (zh) * 1994-11-03 1995-08-30 孙纪敏 窑炉传动瓷管故障自动报警装置
JPH0989461A (ja) * 1995-09-20 1997-04-04 Tokai Konetsu Kogyo Co Ltd ローラハース炉のローラ折損検知警報装置
JPH11132666A (ja) * 1997-10-30 1999-05-21 Tdk Corp 炉内のローラ折れ検出装置
JP2000146449A (ja) * 1998-11-17 2000-05-26 Ngk Insulators Ltd ローラハースキルンのローラ駆動装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210116042A (ko) * 2020-03-17 2021-09-27 주식회사 포스코 롤러 변형 상태 검사 장치 및 그 방법

Also Published As

Publication number Publication date
CN1961190A (zh) 2007-05-09
PT1747416E (pt) 2008-02-01
EP1747416A1 (en) 2007-01-31
PL1747416T3 (pl) 2008-04-30
DE602005003466D1 (de) 2008-01-03
ES2296185T3 (es) 2008-04-16
WO2005114081A1 (en) 2005-12-01
BRPI0511020A (pt) 2007-11-27
ITRE20040060A1 (it) 2004-08-21
CN100516745C (zh) 2009-07-22

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