WO1995014900A1 - Continuous furnace - Google Patents

Continuous furnace Download PDF

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Publication number
WO1995014900A1
WO1995014900A1 PCT/DE1994/001344 DE9401344W WO9514900A1 WO 1995014900 A1 WO1995014900 A1 WO 1995014900A1 DE 9401344 W DE9401344 W DE 9401344W WO 9514900 A1 WO9514900 A1 WO 9514900A1
Authority
WO
WIPO (PCT)
Prior art keywords
distance
slideway
tunnel
continuous
continuous furnace
Prior art date
Application number
PCT/DE1994/001344
Other languages
German (de)
French (fr)
Inventor
Horst Winkler
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to DE59407752T priority Critical patent/DE59407752D1/en
Priority to EP95900079A priority patent/EP0730723B1/en
Priority to JP51473895A priority patent/JP3573210B2/en
Publication of WO1995014900A1 publication Critical patent/WO1995014900A1/en

Links

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
    • F27D21/00—Arrangements of monitoring devices; Arrangements of safety 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
    • F27B9/30—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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D2003/0001—Positioning the charge
    • F27D2003/0002—Positioning the charge involving positioning devices, e.g. buffers or buffer zones
    • 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
    • F27D2021/0057—Security or safety devices, e.g. for protection against heat, noise, pollution or too much duress; Ergonomic aspects
    • F27D2021/0092—Security or safety devices, e.g. for protection against heat, noise, pollution or too much duress; Ergonomic aspects against a jam in the transport line or a production interruption

Definitions

  • the invention relates to a continuous furnace with an elongated, heatable continuous tunnel and a slideway for continuous furnace material and with a safety device for detecting the emergence of the continuous furnace material on the slideway.
  • Such a continuous furnace is known from German Offenlegungsschrift 27 57 700.
  • Metal slides of the same length are arranged in a row on the slideway for furnace goods to be conveyed, which are pushed in this slideway in succession through the continuous tunnel of the continuous furnace.
  • the slideway is made of metal at least before the entrance to the tunnel, and an electrical resistance measuring device is connected between this metal and the heating elements on the wall of the tunnel.
  • the metal transport boats warp during the
  • Pushing through the continuous furnace inside the continuous tunnel creates a short circuit between the transport boats and the heating elements, so that the resistance measuring device can immediately switch off a push-through device for the transport boats. This prevents damage to the continuous furnace and, in particular, to its heating elements.
  • a continuous furnace of the type mentioned at the outset is characterized in that a first distance sensor and, at a distance from it in the direction of the continuous tunnel, a second distance sensor are arranged on the continuous tunnel, that the first distance sensor is the distance one on the slideway located object from a first reference point assigned to the first distance sensor on the slideway and with the second distance sensor the distance of a measurement object located on the slideway from a second reference point assigned to the second distance sensor can be determined on the slideway, and that the two Reference points are at a distance from each other.
  • the furnace continuous material consists of boats of the same length arranged in a row, the length of which is smaller than the distance between the reference points of the two distance sensors, it can always be determined whether a boat has always passed the reference point of the first distance sensor as far as another boat has passed the reference point of the second distance sensor, which indicates correct operation. However, at the moment when one of the boats has passed the reference point of the first distance sensor further than the other boat has passed the reference point of the second distance sensor, this indicates that the boats between the two reference points have been rejected so that the boats pass through the tunnel of the continuous furnace can be interrupted to eliminate the fault.
  • Claims 2 to 4 are directed to advantageous designs of the continuous furnace according to claim 1.
  • FIG. 1 schematically shows the continuous tunnel of a continuous furnace according to the invention.
  • FIG. 2 schematically shows a distance transmitter on the continuous tunnel according to FIG. 1.
  • FIG. 3 shows a view of the slideway in the continuous tunnel according to FIG. 1.
  • the continuous tunnel 2 shown in FIG. 1 has a slide 3 for ceramic boats 4, which have the same length and are in a row on the slide 3. These ceramic boats 4 are used, for example, to hold sintered goods. Electrical heating elements are also attached to the pass-through tunnel 2, which are not shown in FIG. At the inlet end of the tunnel 2 there is a lateral filling opening 5 and at the other end, the outlet end of this tunnel 2, there is a lateral removal opening 6.
  • Each of these two thrust chains 8 hangs over the outer surface of a toothed wheel 9 which engages with teeth in the relevant push chain 8 on this outer surface.
  • Both gears 9 sit side by side on a drive shaft 10 of an electric drive motor 11.
  • An absolute value rotary encoder 12 is also located on the drive shaft 10 as the first distance encoder, the associated reference point on the slide 3 being the transverse edge 13 at the end of the slide 3 which the lateral filling opening 5 is located.
  • the absolute value rotary encoder 12 detects the distance that the side face of the thrust body 7 abutting a ceramic boat 4a and thus the ceramic boat 4a itself is at reference point 13.
  • the absolute encoder 12 has a circular segment disk 24, which is fixed concentrically on the drive shaft 10.
  • the segment disc 24 is provided with a plurality of circular code paths 15 which chied radius and are concentric to the segment disc 14.
  • Each code path 15 is assigned a light barrier, which has a light source 16 on one side of the segment disk 24 and a photodiode 17 assigned to this light source 16 on the other side.
  • the light beam of the associated light barrier assigned to the relevant code track can pass through the segment disk 24.
  • the absolute value rotary encoder 12 generates a unique signal combination for each angular position of the drive shaft 10 and thus of the segment disk 24, regardless of the direction of rotation of the drive shaft 10, with the aid of which the associated angular position of the drive shaft 10 and thus ultimately the distance of the on the thrust body 7 adjacent ceramic boat 4a can be read from the reference point 13.
  • a laser 18 as a further distance transmitter, which emits infrared light pulses and receives the infrared light pulses reflected from a side surface of the ceramic boat 4b. These received infrared light pulses arrive at a photodiode on the laser 18, which converts these infrared light pulses into an electrical signal with which the transit time of the infrared light pulses from the laser 18 to the ceramic boat 4b and back to the laser 18 and thus the Distance of the ceramic boat 4b from the reference point 14 of the laser 18 on the slideway 3 can be determined.
  • This reference point 14 is the transverse edge of the slideway 3 at the end of the tunnel 2 at which the lateral removal opening 6 is located.
  • an electronic control unit 20 which controls the electric drive motor 11 as a function of the control both of the absolute rotary encoder 12 and of the laser 18 with its photodiode and of a temperature sensor, for example consisting of a thermocouple 19.
  • Thermocouple 19 is arranged on the tunnel 2 between the two reference points 13 and 14.
  • the electronic control unit 20 stops the electric drive motor 11 when the sum of the distance L1 of the ceramic boat 4a measured by the absolute value rotary encoder 12 at the beginning of the row of ceramic boats 4 on the slideway 3 from the reference point 13 and the distance L2 of the ceramic boat 4b at the end of the said row of ceramic boats 4 differs from the reference point 14 from a predetermined value W by a ⁇ w.
  • thermocouple 19 effects a correction of this value W when the passage tunnel 2 is heated differently and thus takes into account the different linear expansions that the ceramic boats in the passage tunnel 2 can experience.
  • the thrust body 7 with the drive motor 11 is first seen in its starting position in front of the reference point 13 in the direction of movement of the ceramic boats on the slideway 3.
  • This ceramic boat 4a is pushed laterally through the filling opening 5 in the direction of the arrow indicated on the slide 3.
  • This ceramic boat 4a has the same length in the longitudinal direction of the slideway 3 as the ceramic boats 4 and 4b already on the slideway. Furthermore, the length of this ceramic boat 4a is smaller than the measuring range of the first distance encoder consisting of the absolute rotary encoder 12 and as the measuring range of the second distance encoder having the laser 18.
  • the length of the ceramic boats 4a, 4 and 4b seen in the longitudinal direction of the slideway 3 is smaller than the distance between the two reference points 13 and 14 from one another.
  • the electric drive motor 11 is switched on again so that it rotates in the push-through direction.
  • the thrust Body 7 is moved with the help of the push chains 8 on the slide 3 in the direction of the laser 18. He moves all the ceramic boats 4, which are arranged in a row on the slideway 3, towards the laser 18.
  • the drive motor 11 is switched off and this ceramic boat 4b is moved laterally from the slide 3 through the removal opening 6 out of the passage unnel 2 in accordance with the arrow entered there. Then the same game starts again.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Tunnel Furnaces (AREA)

Abstract

A continuous furnace with an extended through tunnel (2) has a chute (3) for the material throughput. At the through tunnel (2) there are a first distance detector (12) and a second one (18) at a spaced away from the first. By means of the first distance detector (12) it is possible to find the distance (L1) of a measurement object (4a) on the chute (3) from a first reference point (13) on the chute (3) allocated to the first distance detector (12) and with the second distance detector (18) can be found the distance (23) of a measurement object (4b) on the chute (3) from a second reference point (14) on the chute (3) allocated to the second distance detector (18). The two reference points are spaced apart. The two distance detectors form a safety device to detect backing-up of the material throughput.

Description

Beschreibungdescription
DurchlaufofenContinuous furnace
Die Erfindung betrifft einen Durchlaufofen mit einem langge¬ streckten, beheizbaren Durchlauftunnel und einer Gleitbahn für Ofendurchlaufgut sowie mit einer Sicherheitseinrichtung zum Erfassen des Aufstauchens des Ofendurchlaufguts auf der Gleitbahn.The invention relates to a continuous furnace with an elongated, heatable continuous tunnel and a slideway for continuous furnace material and with a safety device for detecting the emergence of the continuous furnace material on the slideway.
Ein derartiger Durchlaufofen ist aus der deutschen Offenle- gungsschrift 27 57 700 bekannt. Auf der Gleitbahn für Ofen¬ durchlaufgut sind in einer Reihe gleichlange Transportschiff¬ chen aus Metall angeordnet, die auf dieser Gleitbahn der Reihe nach durch den Durchlauftunnel des Durchlaufofens ge¬ schoben werden. Die Gleitbahn besteht zumindest vor dem Ein¬ gang des Durchlauftunnels aus Metall, und zwischen diesem Me¬ tall und den Heizelementen an der Wand des Durchlauftunnels ist ein elektrisches Widerstandsmeßgerät geschaltet. Verwer- fen sich die Transportschiffchen aus Metall während desSuch a continuous furnace is known from German Offenlegungsschrift 27 57 700. Metal slides of the same length are arranged in a row on the slideway for furnace goods to be conveyed, which are pushed in this slideway in succession through the continuous tunnel of the continuous furnace. The slideway is made of metal at least before the entrance to the tunnel, and an electrical resistance measuring device is connected between this metal and the heating elements on the wall of the tunnel. The metal transport boats warp during the
Durchschiebens durch den Durchlaufofen innerhalb des Durch¬ lauftunnels, wird ein Kurzschluß zwischen den Transport¬ schiffchen und den Heizelementen hergestellt, so daß die Wi¬ derstandsmeßeinrichtung eine Durchschiebevorrichtung für die Transportschiffchen sofort abstellen kann. Dadurch wird eine Beschädigung des Durchlaufofens und insbesondere seiner Heiz¬ elemente vermieden.Pushing through the continuous furnace inside the continuous tunnel creates a short circuit between the transport boats and the heating elements, so that the resistance measuring device can immediately switch off a push-through device for the transport boats. This prevents damage to the continuous furnace and, in particular, to its heating elements.
Der Erfindung liegt die Aufgabe zugrunde, diesen bekannten Durchlaufofen weiterzubilden und das Überwachen der Trans- portschiffchen auf Verwerfung im Durchlauftunnel auch dann zu ermöglichen, wenn diese Transportschiffchen nicht aus Metall, sondern aus elektrisch nicht leitendem Werkstoff, wie z.B. Keramik, bestehen. Zur Lösung dieser Aufgabe ist ein Durchlaufofen der eingangs erwähnten Art erfindungsgemäß dadurch gekennzeichnet, daß am Durchlauftunnel ein erster Distanzgeber und mit Ab¬ stand von diesem in Richtung des Durchlauftunnels gesehen ein zweiter Distanzgeber angeordnet sind, daß mit dem ersten Distanzgeber der Abstand eines auf der Gleitbahn befindlichen Meßobjekts von einer ersten, dem er¬ sten Distanzgeber zugeordneten Bezugsstelle an der Gleitbahn und mit dem zweiten Distanzgeber der Abstand eines auf der Gleitbahn befindlichen Meßobjekts von einer zweiten, dem zweiten Distanzgeber zugeordneten Bezugsstelle an der Gleit¬ bahn ermittelbar ist, und daß die beiden Bezugsstellen Abstand von einander haben.The object of the invention is to further develop this known continuous furnace and to make it possible to monitor the transport boats for warping in the continuous tunnel even if these transport boats do not consist of metal but of electrically non-conductive material, such as ceramic. To achieve this object, a continuous furnace of the type mentioned at the outset is characterized in that a first distance sensor and, at a distance from it in the direction of the continuous tunnel, a second distance sensor are arranged on the continuous tunnel, that the first distance sensor is the distance one on the slideway located object from a first reference point assigned to the first distance sensor on the slideway and with the second distance sensor the distance of a measurement object located on the slideway from a second reference point assigned to the second distance sensor can be determined on the slideway, and that the two Reference points are at a distance from each other.
Besteht das Ofendurchlaufgut aus in einer Reihe angeordneten, gleichlangen Schiffchen, deren Länge kleiner als der Abstand der Bezugsstellen der beiden Distanzgeber ist, so kann stets festgestellt werden, ob ein Schiffchen die Bezugsstelle des ersten Distanzgebers stets genauso weit passiert hat wie ein anderes Schiffchen die Bezugsstelle des zweiten Distanzge¬ bers, was auf einen einwandfreien Betrieb hindeutet. In dem Moment jedoch, in dem das eine Schiffchen die Bezugsstelle des ersten Distanzgebers weiter passiert hat als das andere Schiffchen die Bezugsstelle des zweiten Distanzgebers, deutet dies auf eine Verwerfung der Schiffchen zwischen den beiden Bezugsstellen hin, so daß der Durchlauf der Schiffchen durch den Durchlauftunnel des Durchlaufofens zur Beseitigung der Störung unterbrochen werden kann.If the furnace continuous material consists of boats of the same length arranged in a row, the length of which is smaller than the distance between the reference points of the two distance sensors, it can always be determined whether a boat has always passed the reference point of the first distance sensor as far as another boat has passed the reference point of the second distance sensor, which indicates correct operation. However, at the moment when one of the boats has passed the reference point of the first distance sensor further than the other boat has passed the reference point of the second distance sensor, this indicates that the boats between the two reference points have been rejected so that the boats pass through the tunnel of the continuous furnace can be interrupted to eliminate the fault.
Die Patentansprüche 2 bis 4 sind auf vorteilhafte Ausbildun¬ gen des Durchlaufofens nach Patentanspruch 1 gerichtet.Claims 2 to 4 are directed to advantageous designs of the continuous furnace according to claim 1.
Die Erfindung und ihre Vorteile seien anhand der Zeichnung an einem Ausführungsbeispiel näher erläutert:The invention and its advantages are explained in more detail with reference to the drawing using an exemplary embodiment:
FIG 1 zeigt schematisch den Durchlauftunnel eines erfin¬ dungsgemäßen Durchlaufofens. FIG 2 zeigt schematisch einen Distanzgeber am Durchlauf¬ tunnel nach FIG 1.1 schematically shows the continuous tunnel of a continuous furnace according to the invention. FIG. 2 schematically shows a distance transmitter on the continuous tunnel according to FIG. 1.
FIG 3 zeigt eine Ansicht der Gleitbahn im Durchlauftunnel nach FIG 1.3 shows a view of the slideway in the continuous tunnel according to FIG. 1.
Der in FIG 1 dargestellte Durchlauftunnel 2 hat eine Gleit¬ bahn 3 für Keramikschiffchen 4, die gleiche Länge haben und sich in einer Reihe auf der Gleitbahn 3 befinden. Diese Kera¬ mikschiffchen 4 dienen beispielsweise zur Aufnahme von Sin¬ tergut Am Durchlauftunnel 2 sind ferner elektrische Heizele¬ mente angebracht, die in FIG 1 nicht dargestellt sind. Am Eintrittsende des Durchlauftunnels 2 befindet sich eine seitliche Befüllöffnung 5 und am anderen Ende, dem Austritts- ende dieses Durchlauftunnels 2, eine seitliche Entnahmeöff¬ nung 6.The continuous tunnel 2 shown in FIG. 1 has a slide 3 for ceramic boats 4, which have the same length and are in a row on the slide 3. These ceramic boats 4 are used, for example, to hold sintered goods. Electrical heating elements are also attached to the pass-through tunnel 2, which are not shown in FIG. At the inlet end of the tunnel 2 there is a lateral filling opening 5 and at the other end, the outlet end of this tunnel 2, there is a lateral removal opening 6.
Am Eintrittsende des Durchlauftunnels 2 befindet sich ferner auf der Gleitbahn 3 ein Schubkörper 7 mit zwei Schubketten 8. Jede dieser beiden Schubketten 8 hängt über der Mantelfläche eines Zahnrades 9, das an dieser Mantelfläche mit Zähnen in die betreffende Schubkette 8 greift. Beide Zahnräder 9 sitzen nebeneinander auf einer Antriebswelle 10 eines elektrischen Antriebsmotors 11. Auf der Antriebswelle 10 sitzt ferner als erster Distanzgeber ein Absolutwert-Drehgeber 12, dessen zu¬ geordnete Bezugsstelle an der Gleitbahn 3 die Querkante 13 an dem Ende der Gleitbahn 3 ist, an dem sich die seitliche Be¬ füllöffnung 5 befindet. Der Absolutwert-Drehgeber 12 erfaßt den Abstand, den die an einem Keramikschiffchen 4a anliegende Seitenfläche des Schubkörpers 7 und damit das Keramikschiff¬ chen 4a selbst von der Bezugsstelle 13 hat.At the entry end of the tunnel 2 there is also a thrust body 7 with two thrust chains 8 on the slideway 3. Each of these two thrust chains 8 hangs over the outer surface of a toothed wheel 9 which engages with teeth in the relevant push chain 8 on this outer surface. Both gears 9 sit side by side on a drive shaft 10 of an electric drive motor 11. An absolute value rotary encoder 12 is also located on the drive shaft 10 as the first distance encoder, the associated reference point on the slide 3 being the transverse edge 13 at the end of the slide 3 which the lateral filling opening 5 is located. The absolute value rotary encoder 12 detects the distance that the side face of the thrust body 7 abutting a ceramic boat 4a and thus the ceramic boat 4a itself is at reference point 13.
Der Absolutwer -Drehgeber 12 hat, wie FIG 2 zeigt, eine kreisrunde Segmentscheibe 24, die konzentrisch fest auf der Antriebswelle 10 angebracht ist. Die Segmen scheibe 24 ist mit mehreren kreisförmigen Codebahnen 15 versehen, die unter- chiedlichen Radius haben und konzentrisch zur Segmentscheibe 14 sind. Jeder Codebahn 15 ist eine Lichtschranke zugeordnet, die auf der einen Seite der Segmentscheibe 24 eine Licht¬ quelle 16 und auf der anderen Seite eine dieser Lichtquelle 16 zugeordnete Fotodiode 17 hat. .An den Codemustern der ein¬ zelnen Codebahnen 15 kann der Lichtstrahl der der betreffen¬ den Codebahn zugeordneten zugeordneten Lichtschranke durch die Segmentscheibe 24 hindurch passieren.As shown in FIG. 2, the absolute encoder 12 has a circular segment disk 24, which is fixed concentrically on the drive shaft 10. The segment disc 24 is provided with a plurality of circular code paths 15 which chied radius and are concentric to the segment disc 14. Each code path 15 is assigned a light barrier, which has a light source 16 on one side of the segment disk 24 and a photodiode 17 assigned to this light source 16 on the other side. At the code patterns of the individual code tracks 15, the light beam of the associated light barrier assigned to the relevant code track can pass through the segment disk 24.
Der Absolutwert-Drehgeber 12 erzeugt für jede Winkelstellung der Antriebswelle 10 und damit der Segmentscheibe 24 unabhän¬ gig von der Drehrichtung der Antriebswelle 10 eine eindeutige Signalkombination, mit deren Hilfe die zugehörige Winkelposi¬ tion der Antriebswelle 10 und damit letztendlich die Distanz des am Schubkörper 7 anliegenden Keramikschiffchens 4a von der Bezugsstelle 13 abgelesen werden kann.The absolute value rotary encoder 12 generates a unique signal combination for each angular position of the drive shaft 10 and thus of the segment disk 24, regardless of the direction of rotation of the drive shaft 10, with the aid of which the associated angular position of the drive shaft 10 and thus ultimately the distance of the on the thrust body 7 adjacent ceramic boat 4a can be read from the reference point 13.
Am anderen Ende der Gleitbahn 3 und damit des Durchlauf un- nels 2 befindet sich als weiterer Distanzgeber ein Laser 18, der Infrarot-Lich impule aussendet und die von einer Seiten¬ fläche des Keramikschiffchens 4b reflektierten Infrarot- Lichtimpulse empfängt. Diese empfangenen Infrarot-Lichtim¬ pulse gelangen auf eine Fotodiode am Laser 18, die diese In¬ frarot-Lichtimpulse in ein elektrisches Signal umwandelt, mit dem die Laufzeit der Infrarot-Lichtimpulse vom Laser 18 zum Keramikschiffchen 4b und zurück zum Laser 18 und damit der Abstand des Keramikschiffchens 4b von der Bezugsstelle 14 des Lasers 18 an der Gleitbahn 3 bestimmt werden kann. Diese Be¬ zugsstelle 14 ist die Querkante der Gleitbahn 3 an dem Ende des Durchlauftunnels 2, an dem sich die seitliche Entnahme¬ öffnung 6 befindet.At the other end of the slideway 3 and thus of the passage 2, there is a laser 18 as a further distance transmitter, which emits infrared light pulses and receives the infrared light pulses reflected from a side surface of the ceramic boat 4b. These received infrared light pulses arrive at a photodiode on the laser 18, which converts these infrared light pulses into an electrical signal with which the transit time of the infrared light pulses from the laser 18 to the ceramic boat 4b and back to the laser 18 and thus the Distance of the ceramic boat 4b from the reference point 14 of the laser 18 on the slideway 3 can be determined. This reference point 14 is the transverse edge of the slideway 3 at the end of the tunnel 2 at which the lateral removal opening 6 is located.
Ferner ist ein elektronisches Steuergerät 20 vorgesehen, das in Steuerabhängigkeit sowohl vom Absolutwer -Drehgeber 12 und vom Laser 18 mit seiner Fotodiode als auch von einem bei¬ spielsweise aus einem Thermoelement 19 bestehenden Tempera¬ turfühler den elektrischen Antriebsmotor 11 steuert. Das Thermoelement 19 ist am Durchlauftunnel 2 zwischen den beiden Bezugsstellen 13 und 14 angeordnet.Furthermore, an electronic control unit 20 is provided which controls the electric drive motor 11 as a function of the control both of the absolute rotary encoder 12 and of the laser 18 with its photodiode and of a temperature sensor, for example consisting of a thermocouple 19. The Thermocouple 19 is arranged on the tunnel 2 between the two reference points 13 and 14.
Das elektronische Steuergerät 20 hält den elektrischen An- triebsmotor 11 an, wenn die Summe des vom Absolutwert-Drehge¬ ber 12 gemessenen Abstands Ll des Keramikschiffchens 4a am Anfang der auf der Gleitbahn 3 befindlichen Reihe Keramik¬ schiffchen 4 von der Bezugsstelle 13 und des Abstands L2 des Keramikschiffchens 4b am Ende der besagten Reihe Keramik- Schiffchen 4 von der Bezugsεtelle 14 von einem vorgegebenen Wert W um ein Δw abweicht.The electronic control unit 20 stops the electric drive motor 11 when the sum of the distance L1 of the ceramic boat 4a measured by the absolute value rotary encoder 12 at the beginning of the row of ceramic boats 4 on the slideway 3 from the reference point 13 and the distance L2 of the ceramic boat 4b at the end of the said row of ceramic boats 4 differs from the reference point 14 from a predetermined value W by a Δw.
Das Thermoelement 19 bewirkt eine Korrektur dieses Werts W bei unterschiedlicher Beheizung des Durchlauftunnels 2 und berücksichtigt so die verschiedene Längenausdehnungen, die die Keramikschiffchen im Durchlauftunnel 2 erfahren können.The thermocouple 19 effects a correction of this value W when the passage tunnel 2 is heated differently and thus takes into account the different linear expansions that the ceramic boats in the passage tunnel 2 can experience.
Zum Betrieb des Durchlaufofens mit dem Durchlauftunnel 2 wird zunächst der Schubkörper 7 mit dem Antriebsmotor 11 in seine Ausgangsstellung vor der Bezugsstelle 13 gesehen in Bewe- gungsrichtung der Keramikschiffchen auf der Gleitbahn 3 ge¬ fahren.To operate the continuous furnace with the continuous tunnel 2, the thrust body 7 with the drive motor 11 is first seen in its starting position in front of the reference point 13 in the direction of movement of the ceramic boats on the slideway 3.
Sodann wird seitlich durch die Befüllöffnung 5 in Richtung des angegebenen Pfeils das Keramikschiffchen 4a auf die Gleitbahn 3 geschoben. Dieses Keramikschiffchen 4a hat die gleiche Länge in Längsrichtung der Gleitbahn 3 gesehen, wie die bereits auf der Gleitbahn befindlichen Keramikschiffchen 4 und 4b. Ferner ist die Länge dieses Keramikschiffchens 4a kleiner als der Meßbereich des aus dem Absolutwer -Drehgeber 12 bestehenden ersten Distanzgebers und als der Meßbereich des den Laser 18 aufweisenden zweiten Distanzgebers. Auch ist die Länge der Keramikschiffchen 4a, 4 und 4b in Längsrichtung der Gleitbahn 3 gesehen kleiner als der Abstand der beiden Bezugsstellen 13 und 14 voneinander.Then the ceramic boat 4a is pushed laterally through the filling opening 5 in the direction of the arrow indicated on the slide 3. This ceramic boat 4a has the same length in the longitudinal direction of the slideway 3 as the ceramic boats 4 and 4b already on the slideway. Furthermore, the length of this ceramic boat 4a is smaller than the measuring range of the first distance encoder consisting of the absolute rotary encoder 12 and as the measuring range of the second distance encoder having the laser 18. The length of the ceramic boats 4a, 4 and 4b seen in the longitudinal direction of the slideway 3 is smaller than the distance between the two reference points 13 and 14 from one another.
Sodann wird der elektrische Antriebsmotor 11 wieder so einge¬ schaltet, daß er sich in Durchschubrichtung dreht. Der Schub- körper 7 wird mit Hilfe der Schubketten 8 auf der Gleitbahn 3 in Richtung zum Laser 18 hin verschoben. Dabei verschiebt er sämtliche Keramikschiffchen 4, die in einer Reihe auf der Gleitbahn 3 angeordnet sind, in Richtung auf den Laser 18 zu. Hat das Keramikschiffchen 4b die Entnahmeöffnung 6 erreicht, wird der Antriebsmotor 11 ausgeschaltet und dieses Keramik¬ schiffchen 4b seitlich von der Gleitbahn 3 durch die Entnah¬ meöffnung 6 aus dem Durchlauf unnel 2 entsprechend dem dort eingetragenen Pfeil herausbewegt. Sodann beginnt das gleiche Spiel von neuem.Then the electric drive motor 11 is switched on again so that it rotates in the push-through direction. The thrust Body 7 is moved with the help of the push chains 8 on the slide 3 in the direction of the laser 18. He moves all the ceramic boats 4, which are arranged in a row on the slideway 3, towards the laser 18. When the ceramic boat 4b has reached the removal opening 6, the drive motor 11 is switched off and this ceramic boat 4b is moved laterally from the slide 3 through the removal opening 6 out of the passage unnel 2 in accordance with the arrow entered there. Then the same game starts again.
Tritt bei diesem Verschieben der Keramikschiffchen auf der Gleitbahn 3 eine Verwerfung z.B. von zwei Keramikschiffchen 4 nach oben- wie in Fig. 3 dargestellt - auf, wird der An- triebsschrittmotor 11 sofort ausgeschaltet, da die Summe aus den Abständen Ll und L2 nicht mehr gleich dem vorgegebenen Wert W ist. Hierdurch wird eine Beschädigung des Durch¬ laufofens und insbesondere seiner Heizkörper am Durchlauftun¬ nel 2 also auch dann vermieden, wenn diese Keramikschiffchen 4 elektrisch nicht leitend sind. If the ceramic boats move on the slide 3, a warp occurs e.g. from two ceramic boats 4 upwards - as shown in FIG. 3 - the drive stepping motor 11 is switched off immediately since the sum of the distances L1 and L2 is no longer equal to the predetermined value W. In this way, damage to the continuous furnace and, in particular, its heating elements on the continuous tunnel 2 is avoided even if these ceramic boats 4 are not electrically conductive.

Claims

Patentansprüche claims
1. Durchlaufofen mit einem langgestreckten, beheizbaren Durchlauftunnel und einer Gleitbahn für Ofendurchlaufgut so- wie mit einer Sicherheitseinrichtung zum Erfassen des Auf¬ stauchens des Ofendurchlaufguts auf der Gleitbahn, d a d u r c h g e k e n n z e i c h n e t , daß am Durchlauftunnel (2) ein erster Distanzgeber (12) und mit Abstand von diesem in Richtung des Durchlauftunnels (2) gesehen ein zweiter Distanzgeber (18) angeordnet sind, daß mit dem ersten Distanzgeber (12) der Abstand (Ll) eines auf der Gleitbahn (3) befindlichen Meßobjekts (4a) von einer ersten, dem ersten Distanzgeber (12) zugeordneten Bezugs¬ stelle (13) an der Gleitbahn (3) und mit dem zweiten Diεtanz- geber (18) der Abstand (L3) eines auf der Gleitbahn (3) be¬ findlichen Meßobjekts (4b) von einer zweiten, dem zweiten Distanzgeber (18) zugeordneten Bezugsstelle (14) an der Gleitbahn (3) ermittelbar ist, und daß die beiden Bezugsstellen (13, 14) Abstand von einander haben.1. Continuous furnace with an elongated, heatable continuous tunnel and a slideway for continuous furnace material as well as with a safety device for detecting the upsetting of the furnace continuous material on the slideway, characterized in that a first distance sensor (12) and at a distance from the continuous tunnel (2) seen in the direction of the tunnel (2), a second distance sensor (18) is arranged, that with the first distance sensor (12) the distance (L1) of a measuring object (4a) located on the slideway (3) from a first, the first distance sensor (12) assigned reference point (13) on the slideway (3) and, with the second distance sensor (18), the distance (L3) of a measurement object (4b) located on the slideway (3) from a second, the second distance sensor (18) associated reference point (14) on the slideway (3) can be determined, and that the two reference points (13, 14) are spaced from each other.
2. Durchlaufofen nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , daß eine Durchschiebevorrichtung (7, 8, 9, 10, 11) für das Ofendurchlaufgut (4a, 4, 4b) vorgesehen ist.2. Continuous furnace according to claim 1, so that a push-through device (7, 8, 9, 10, 11) is provided for the continuous furnace material (4a, 4, 4b).
3. Durchlaufofen nach Anspruch 2, d a d u r c h g e k e n n z e i c h n e t , daß die Durchschiebevorrichtung (7, 8, 9, 10, 11) in Steuer- abhängigkeit von den beiden Distanzgebern (12, 18) derart steht, daß diese Durchschiebevorrichtung (7, 8, 9, 10, 11) anhält, wenn die Summe der von den beiden Distanzgebern (12, 18) gemessenen Abstände (Ll, L3) von einem vorgegebenen Wert (W) abweicht.3. Continuous furnace according to claim 2, characterized in that the push-through device (7, 8, 9, 10, 11) is dependent on the control of the two distance sensors (12, 18) such that this push-through device (7, 8, 9, 10 , 11) stops when the sum of the distances (L1, L3) measured by the two distance sensors (12, 18) deviates from a predetermined value (W).
4. Durchlauf ofen nach Anspruch 3 , d a d u r c h g e k e n n z e i c h n e t , daß der Wert (W) in Steuerabhängigkeit von einem Temperaturfühler4. continuous furnace according to claim 3, characterized in that the value (W) depending on the control of a temperature sensor
(19) steht, der am Durchlauftunnel (2) zwischen den beiden(19) is the one at the tunnel (2) between the two
Bezugsstellen (13) und (14) angeordnet ist. Reference points (13) and (14) is arranged.
PCT/DE1994/001344 1993-11-25 1994-11-14 Continuous furnace WO1995014900A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE59407752T DE59407752D1 (en) 1993-11-25 1994-11-14 CONTINUOUS
EP95900079A EP0730723B1 (en) 1993-11-25 1994-11-14 Continuous furnace
JP51473895A JP3573210B2 (en) 1993-11-25 1994-11-14 Continuous furnace

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4340220 1993-11-25
DEP4340220.8 1993-11-25

Publications (1)

Publication Number Publication Date
WO1995014900A1 true WO1995014900A1 (en) 1995-06-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Link
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JP (1) JP3573210B2 (en)
DE (1) DE59407752D1 (en)
WO (1) WO1995014900A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4605948B2 (en) * 2001-07-16 2011-01-05 大日本印刷株式会社 Warpage measuring apparatus and firing apparatus using the same

Citations (4)

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BE560097A (en) *
DE2032493A1 (en) * 1969-07-10 1971-02-04 Salem Brosius Ine , Pittsburgh, Pa (V St A) Control system for a swing beam furnace
DE2402369B1 (en) * 1974-01-18 1974-10-24 Robert 6312 Laubach Friedrichs
DE4120216A1 (en) * 1991-06-19 1992-12-24 Aichelin Gmbh Position determn. of workpieces passing through tunnel furnace - measuring relationships of set positions to proximity sensors at entry and exit

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE560097A (en) *
DE2032493A1 (en) * 1969-07-10 1971-02-04 Salem Brosius Ine , Pittsburgh, Pa (V St A) Control system for a swing beam furnace
DE2402369B1 (en) * 1974-01-18 1974-10-24 Robert 6312 Laubach Friedrichs
DE4120216A1 (en) * 1991-06-19 1992-12-24 Aichelin Gmbh Position determn. of workpieces passing through tunnel furnace - measuring relationships of set positions to proximity sensors at entry and exit

Non-Patent Citations (1)

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Title
H.G.WILHELM ET AL.: "optische positionierung und längenmessung von brammen an einem Hubbalkenofen", STAHL UND EISEN., vol. 106, no. 19, 22 September 1986 (1986-09-22), DUSSELDORF DE, pages 997 - 998 *

Also Published As

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DE59407752D1 (en) 1999-03-11
JP3573210B2 (en) 2004-10-06
EP0730723B1 (en) 1999-01-27
EP0730723A1 (en) 1996-09-11
JPH09505662A (en) 1997-06-03

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