EP0522512B1 - Verfahren und Vorrichtung zur Wärmebehandlung von Werkstücken - Google Patents

Verfahren und Vorrichtung zur Wärmebehandlung von Werkstücken Download PDF

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Publication number
EP0522512B1
EP0522512B1 EP92111518A EP92111518A EP0522512B1 EP 0522512 B1 EP0522512 B1 EP 0522512B1 EP 92111518 A EP92111518 A EP 92111518A EP 92111518 A EP92111518 A EP 92111518A EP 0522512 B1 EP0522512 B1 EP 0522512B1
Authority
EP
European Patent Office
Prior art keywords
furnace
grates
transport
slide
slides
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.)
Expired - Lifetime
Application number
EP92111518A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0522512A1 (de
Inventor
Hartmut Steck-Winter
Franz Hagenauer
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.)
Aichelin GmbH Germany
Original Assignee
Aichelin GmbH Germany
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 Aichelin GmbH Germany filed Critical Aichelin GmbH Germany
Publication of EP0522512A1 publication Critical patent/EP0522512A1/de
Application granted granted Critical
Publication of EP0522512B1 publication Critical patent/EP0522512B1/de
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
    • F27B9/14—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
    • F27B9/26—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 on or in trucks, sleds, or containers
    • 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
    • F27B9/201—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 walking beam furnace
    • F27B9/202—Conveyor mechanisms therefor
    • F27B9/203—Conveyor mechanisms therefor having ramps

Definitions

  • industrial furnaces are usually designed as continuously or intermittently operating furnaces.
  • the individual workpieces or batches are transported in cycles on grates within an oven chamber.
  • grates are to be understood broadly below, so that this term also baskets or the like. includes.
  • Various transport systems are known for transporting the grids within an oven space.
  • the puncture principle also has a number of specific disadvantages.
  • the oven must always be operated with the full number of grates, which means, for example, when empty at the weekend that empty grates must be moved between the occupied grates.
  • the heating of this "dead weight" increases the energy requirement of the furnace.
  • the supply of empty gratings in automatic operation means additional effort and additional malfunctions.
  • the number of grids that slide against one another is limited, since the grates that follow must absorb the pushing torque of the leading grids. Since the grate grows considerably during continuous operation at high temperatures, it is also not possible to guide the grids sideways, which means that there is a transport fault considerable damage in the oven, for example on the heating, can result.
  • due to the frictional contact between the grates and the furnace floor there is considerable wear on the floor and the grates.
  • walking beam transports are known in which the gratings are lifted and moved forward by walking beams.
  • the walking beams are each articulated to at least two rotary drives, so that an approximately elliptical movement curve results for the walking beam.
  • the lifting phase the walking beam is raised and moved forward in the transport direction.
  • the lowering phase of the walking beam begins, in which the grids are moved forward until they are put back on the furnace floor and the walking beam is finally moved back to its starting position by further rotation of the rotary drives.
  • Walking beam transports are only used sporadically in gas atmospheres, since complex and therefore fault-prone mechanics have to be installed in the hot furnace chamber.
  • the constantly moving up and down walking beam creates a pumping effect that undesirably affects the gas atmosphere.
  • the workpieces to be treated are lifted off the furnace floor during a lifting phase, transported during a feed phase and placed on the furnace floor in a lowering phase.
  • a transport device in the furnace which consists of one or more pairs of slides, which are arranged below the workpieces.
  • Each pair consists of an upper and a lower slide.
  • the upper and the lower slide have guide surfaces designed as inclined planes, on which the upper slide is supported on the lower slide. In a starting position, the lower and upper slides are positively on top of each other.
  • the upper slide is raised by sliding onto the lower slide.
  • the upper slide is held in place by a stop opposite the return slide. After the workpieces have been lifted off the furnace floor in this way, a piercer pushes the lower slide in the transport direction.
  • the upper slide follows the lower slide due to a frictional contact that exists between the guide surfaces of the lower and upper slide. Subsequently, by pushing the lower slide further in the transport direction, the upper slide is lowered again onto the lower slide by holding the upper slide spatially fixed by a second fixed stop at the end of the furnace lying in the transport direction. Finally, both slides lying on top of each other in a form-fitting manner are pushed back into the starting position by means of a back slider, and the cycle begins again.
  • the invention has for its object to develop a method and an apparatus of the type mentioned in such a way that the operational safety of such a system is further improved.
  • the object is achieved according to the method mentioned at the outset in that in the feed phase both slides are moved forward together by means of a pusher acting on both slides, and in the lowering phase the upper slider is moved back against the transport direction by means of a pusher.
  • the object is achieved according to the oven mentioned at the outset by the fact that the pusher also acts on the upper slide in the feed phase and that a pusher is arranged at the end of the transport device lying in the transport direction, which acts on the upper slide in the lowering phase against the transport direction.
  • both slides are moved forward together in the feed phase by means of a pusher acting on both slides, the operational safety is increased in such a way that in the event of increased frictional resistance when the slides pass through the guides due to increased abrasion or soot formation or falling clamping workpieces a premature lowering of the upper slide on the lower slide and thus an undesired premature depositing of the workpieces on the furnace floor is prevented.
  • a particular advantage of the combination of a push-through with a push-off and a push-back is to be seen in the fact that the entire movement sequence of the transport system can be controlled via pushing parts, which results in an extremely simple, less prone to failure mechanism.
  • the slides have guide surfaces lying one on top of the other for lifting and lowering the upper slide.
  • the guide surfaces can be coordinated so that the desired displacement in the vertical direction results.
  • the conversion of a movement in the horizontal direction into a movement in the vertical direction can be achieved in a particularly simple manner in that the guide surfaces are in relation to one another parallel inclined planes of the upper slide or lower slide are formed.
  • eccentric elements can be provided between the two slides to raise and lower the upper slider.
  • eccentric elements means a somewhat more complicated structure of the mechanics, without, however, reducing operational reliability.
  • the adjustment movement of the eccentric can be done via a separate drive, in addition the eccentric can also be coupled to a common linkage that triggers a rotation of the eccentric and thus a lifting or lowering movement by moving the slide in the longitudinal direction.
  • a link guide can be provided between the two slides, in which a cam engages.
  • the slides are guided in guides on the furnace floor.
  • the transport device is modular, i.e. composed of individual modules, which are arranged one behind the other in the transport direction.
  • This modular design means that the transport system can be easily adapted to a desired furnace length, which is determined by the number of grate locations, and the number of spare and wear parts can be reduced.
  • the modular structure also significantly increases the flexibility in building and operating the furnace. For example, with a two-lane furnace, it is possible to set different dwell times for the individual workpieces in the furnace by pushing grids across the previously calculated gap locations on the opposite path. In this way, almost any dwell times can be set within the limits of the throughput times of the different lanes.
  • both slides 76, 78 are moved back in their starting position according to FIG. 4e by pushing the return slide 72 against the transport direction.
  • an upper slide 126 and a lower slide 128 are also provided in order to lift the grids 114 from the furnace floor 124 and to move them forward.
  • eccentric elements 130 are arranged between the upper slide 126 and the lower slide 128, via which the upper slide 126 can be moved upwards in order to lift the grids 114 off the furnace floor 124.
  • An additional mechanism can be provided for actuating the eccentrics 130, but the eccentrics 130 can also be rotated via a common push rod 132, which is shown in broken lines in FIG. 5 and is connected to the eccentrics via joints 134.
  • the push rod can protrude in the direction of the push rod, so that the eccentrics are actuated when the push rod hits the push rod 132.
  • FIG. 6 shows a further modification of the furnace according to the invention, which is generally designated by the number 140.
  • This embodiment differs from the embodiment according to FIGS. 3a and b in that instead of inclined planes on the lower slide 168, slide guides 174 are provided, which engage in the cams 172 of the upper slide 166.
  • a predetermined movement curve when raising and lowering the upper slide 166 relative to the lower slide 168 can be set by the link guide.
  • the remaining movement sequence corresponds entirely to the movement sequence in the embodiment according to FIGS. 3a and b.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Tunnel Furnaces (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Heat Treatment Of Articles (AREA)
  • Incineration Of Waste (AREA)
EP92111518A 1991-07-08 1992-07-07 Verfahren und Vorrichtung zur Wärmebehandlung von Werkstücken Expired - Lifetime EP0522512B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4122573 1991-07-08
DE4122573 1991-07-08
DE4132197 1991-09-27
DE4132197A DE4132197A1 (de) 1991-07-08 1991-09-27 Verfahren und vorrichtung zur waermebehandlung von werkstuecken

Publications (2)

Publication Number Publication Date
EP0522512A1 EP0522512A1 (de) 1993-01-13
EP0522512B1 true EP0522512B1 (de) 1995-11-15

Family

ID=25905303

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92111518A Expired - Lifetime EP0522512B1 (de) 1991-07-08 1992-07-07 Verfahren und Vorrichtung zur Wärmebehandlung von Werkstücken

Country Status (4)

Country Link
EP (1) EP0522512B1 (es)
AT (1) ATE130430T1 (es)
DE (2) DE4132197A1 (es)
ES (1) ES2081527T3 (es)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4316841A1 (de) * 1993-05-19 1994-11-24 Aichelin Gmbh Vorrichtung zur Wärmebehandlung metallischer Werkstücke
DE4433612A1 (de) * 1994-09-21 1996-03-28 Aichelin Gmbh Ofen zur Wärmebehandlung von Werkstücken
DE10337304B4 (de) * 2003-08-14 2008-07-03 Sms Elotherm Gmbh Erwärmunganlage

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2057367A (en) * 1936-04-25 1936-10-13 Surface Combustion Corp Walking beam furnace
FR849857A (fr) * 1938-02-07 1939-12-04 Bbc Brown Boveri & Cie Dispositif transporteur pour fours à tunnel à marche continue
GB1417373A (en) * 1974-02-25 1975-12-10 Prepovske Strojirny Narodni Po Conveyer
DE2730310C2 (de) * 1977-07-05 1985-10-17 Ruhrgas Ag, 4300 Essen Verfahren zum Fördern von Rosten durch einen Tunnelofen
DE2831251C2 (de) * 1978-07-15 1986-10-16 Smit Ovens Nijmegen B.V., Nijmegen Hubplattenofen
ES476763A1 (es) * 1979-01-11 1980-04-01 Barboni Giorgio Mejoras en hornos para coccion de azulejos.
DE3430118C1 (de) * 1984-08-16 1986-01-09 Degussa Ag, 6000 Frankfurt Beschickungsvorrichtung fuer Waermebehandlungsoefen

Also Published As

Publication number Publication date
DE4132197A1 (de) 1993-01-14
DE59204316D1 (de) 1995-12-21
ATE130430T1 (de) 1995-12-15
DE4132197C2 (es) 1993-04-29
ES2081527T3 (es) 1996-03-16
EP0522512A1 (de) 1993-01-13

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