EP2245405B1 - Gate unit and high temperature oven having the same - Google Patents

Gate unit and high temperature oven having the same Download PDF

Info

Publication number
EP2245405B1
EP2245405B1 EP09714185A EP09714185A EP2245405B1 EP 2245405 B1 EP2245405 B1 EP 2245405B1 EP 09714185 A EP09714185 A EP 09714185A EP 09714185 A EP09714185 A EP 09714185A EP 2245405 B1 EP2245405 B1 EP 2245405B1
Authority
EP
European Patent Office
Prior art keywords
high temperature
gate
gate panel
door leaf
furnace
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
EP09714185A
Other languages
German (de)
French (fr)
Other versions
EP2245405A1 (en
Inventor
Karl Berner
Peter Obstfelder
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.)
Eisenmann SE
Original Assignee
Eisenmann SE
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 Eisenmann SE filed Critical Eisenmann SE
Priority to PL09714185T priority Critical patent/PL2245405T3/en
Publication of EP2245405A1 publication Critical patent/EP2245405A1/en
Application granted granted Critical
Publication of EP2245405B1 publication Critical patent/EP2245405B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • F27D99/007—Partitions
    • 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
    • F27B9/02—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity of multiple-track type; of multiple-chamber type; Combinations of furnaces
    • F27B9/028—Multi-chamber type furnaces
    • 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
    • F27B9/02—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity of multiple-track type; of multiple-chamber type; Combinations of furnaces
    • F27B9/029—Multicellular type furnaces constructed with add-on modules

Definitions

  • Such high temperature furnaces are used in the form of vacuum furnaces for firing articles which have to be fired in successive furnaces in different gas atmospheres with partly very low gas pressures. In such high-temperature furnaces temperatures of up to 1800 ° C can prevail during the firing process.
  • a sealing element for example, a silicone gasket is used in known door units, which has a temperature resistance of 240 ° C to a maximum of 300 ° C. If now firing material has to be transferred from one furnace zone to the next, the two adjacent furnace zones must first be evacuated, so that unwanted gas mixing does not occur when the gate leaf is opened. Optionally, the furnace zones may be flooded with an inert gas prior to opening the door leaf.
  • the two adjacent oven zones must be brought to the same pressure level before opening the door leaf. Also, in non-low pressure furnaces, where two adjacent furnace zones are flooded with different operating gases during firing, these two furnace zones enclosing a lock chamber must then be evacuated prior to opening the gate; Afterwards, a pressure equalization must be carried out, for which purpose the furnace zones can optionally be filled with an inert gas.
  • the door leaf After transferring the fuel from the first furnace zone in the second furnace zone, the door leaf is closed again and the oven must be heated accordingly back to its operating temperature of 1500 ° C to 1800 ° C.
  • the object of the invention is therefore to provide a door unit and a high-temperature furnace of the type mentioned, by which or in which the transfer of fuel from a first furnace zone in a second furnace zone can be done faster and with less energy.
  • the harmful influence is given in high-temperature furnaces and especially in vacuum furnaces, in particular by thermal radiation, which can strike the sealing element.
  • thermal radiation powers of up to 500 kW / m 2 are achieved.
  • the oven temperature must not be lowered before the door leaf between its open position and its closed position can be moved.
  • the door leaf can therefore be moved at normal operating temperature of the high-temperature furnace without the sealing element being damaged.
  • the entire period of time required for the transfer of combustible material from a first furnace zone into a second furnace zone adjacent thereto is shortened since neither a cooling phase nor a phase for reheating the furnace tunnel is required.
  • the energy is saved, which had to be expended to the previously necessary reheating.
  • the protective means are designed as a cooling structure, by which at least a portion of the sealing element can be shielded against heat radiation.
  • the cooling structure is a hollow profile through which a cooling medium can flow.
  • a cooling medium water is preferably used.
  • the protection means are relatively opposite the door leaf are movable. This can serve, for example, that at least a portion of the sealing element in the closed position of the door leaf of the protection means is releasable.
  • the pertinent portion of the sealing element in the closed position of the door leaf for example by stationary structural measures, such as a cooled counter surface, be protected against thermal radiation, which are provided on the oven, in which the gate unit is used.
  • the door leaf has a first main surface and a second main surface extending parallel thereto, wherein in at least the edge region of at least one main surface a circumferential groove is recessed, in which a sealing ring is seated.
  • the sealing ring is tubular and can be inflated and emptied, the sealing ring can run in deflated and thus slackened state below the main surface of the door leaf, in which the corresponding groove is recessed. In the inflated state, the sealing ring then presses out of the groove beyond the corresponding main surface of the door leaf and can thus seal against the corresponding counter surface.
  • the sealing element cooperates with counter surfaces formed by the guide structure. If the guide structure is formed, for example, as a guide rail with an inwardly open U-profile, then the inner edges of the U-profile can serve as a counter surface for the sealing element.
  • the researcherssstrüktur comprises a perpendicular to the direction of travel of the door leaf receiving, of which the door leaf is received with at least a portion of the sealing element when it assumes its closed position.
  • the protective means are arranged in the closed position of the door leaf closer to the atmosphere to be shielded than the portion of the sealing element to be shielded.
  • guide-structure shielding means which shield portions of the guide structure extending in the region of the furnace tunnel from the atmosphere in the furnace tunnel when the door leaf is in its open position and / or Torblatt shielding means are provided, which the door leaf against the atmosphere shield in the furnace tunnel when the door leaf is in its open position.
  • the guide structure shielding means and / or the door leaf shielding means comprise pivotable shielding flaps.
  • These shielding flaps can advantageously be arranged to assume a position in which they shield the door leaf against the atmospheres prevailing in the furnace zones when the door leaf assumes its closed position; In particular, a shielding of the door leaf against heat radiation can be ensured thereby.
  • the shielding flaps and the closed door leaf are in a kind of sandwich-order along the furnace tunnel when the door leaf assumes its closed position. In this way, compared to the furnace zones cooler door leaf or the cooler outer surface of a heat insulation of the door leaf leads to less cooling in his or her neighborhood.
  • the guide structure shielding means which can shield the door leaf flanking portions of the guide structure and also the above-mentioned recording, it is advantageous if these comprise at least one device with two flaps, which are each pivotable about an axis of rotation which is parallel to the flaps to be shielded sections of the guide structure extends.
  • a total of 10 evacuated vacuum furnace with a furnace housing 12 is designated.
  • a furnace tunnel 14 extends through the furnace housing.
  • the latter has successive different furnace zones in which different gas atmospheres with partly very low gas pressures can prevail, as is known in and of itself.
  • FIGS. 1 . 3 and 4 two successive furnace zones in the conveying direction 16 in the form of a first furnace zone 18 and a second furnace zone 20, between which a transition region 22 is arranged.
  • the transition region 22 between the furnace zones 18 and 20 can be selectively released or closed, with the furnace zones 18 and 20 being separated from one another gas-tight in the latter case.
  • kiln material is conveyed through the kiln tunnel 14, for which purpose the kiln can rest directly on the rollers 26 or can be guided through the vacuum kiln 10 in appropriate fueling stations or vessels.
  • the furnace housing 12 is lined in the area of the furnace tunnel 14 inside with a refractory material 28, which allows operating temperatures of the vacuum furnace 10 of up to 1800 ° C.
  • the floor level of the two furnace zones 18 and 20 lies in a common horizontal floor level 30, whereas the floor 32 in the transition area 22 between the furnace zones 18 and 20 is lowered relative to the floor level 30.
  • the gate unit 24 comprises a door leaf 34 with two opposite perpendicular to the conveying direction 16 extending main surfaces 36, 38, two side edges 40, 42 and an upper edge 44 and a lower edge 46.
  • the door leaf 34 extends through a bottom 32 in the transition region 22 opposite Passage 48 in the oven housing 12 upwards into a door housing 50.
  • the door leaf 34 is connected to a pneumatic lifting device 52 of no further interest. Through this, the door leaf 34 vertically between his in the FIGS. 1 and 2 shown open position and its in the FIGS. 3 to 5 shown closed position to be moved.
  • circumferential grooves 54 and 56 are recessed.
  • an elastic tubular inflatable silicone gasket 58 and 60 is inserted, which can withstand temperatures up to about 300 ° C maximum.
  • the silicone gaskets 58 and 60 are inflated by passing through gas, for which purpose inlet and outlet connections, not shown here, are present.
  • the silicone seals 58 and 60 are dimensioned so that they run in the slackened state, ie without gas flowing through them, below the main surface 36 and 38 of the door leaf 34 in the groove 54 and 56, respectively. When inflated, the silicone gaskets 58 and 60 protrude beyond the major surfaces 36 and 38 of the door leaf 34, respectively.
  • the door leaf 34 carries on its side edges 40 and 42 guide plates 62 and 64, which are parallel to the conveying direction 16 and each protrude beyond the main surface 36 and the main surface 38 of the door leaf 34, which in FIG. 4 can be seen.
  • the door leaf 34 runs in a vertical section of a guide structure 66.
  • the vertical section of the guide structure 66 is formed in the region of the oven tunnel 18 by two guide ribs 68, 70 arranged on each side of the door leaf 34, which form the door leaf 34 flanked in the conveying direction 16 front and rear (see. FIG. 4 ).
  • the vertical portion of the guide structure 66 as extending to the right and left of the door leaf 34 groove 72 in the not provided here with a reference numeral, parallel to the conveying direction 16 extending side walls of the door housing 50 is formed.
  • the vertically extending portions of the silicone seals 58 and 60 in the door leaf 34 are of the guide ribs 68 and 70 (see. FIG. 4 ) flank within the grooves 72.
  • the respective guide ribs 68 and 70 located on both sides of the furnace housing 12 are connected by bottom ribs 74 and 76 extending between the side walls of the furnace housing 12.
  • the lower vertical portions of the silicone seals 58, 60 are flanked by the bottom ribs 74 and 76, respectively.
  • the door leaf 34 is water-cooled in a manner known per se. For this purpose it is traversed by a channeled through by cooling water channel system, which is not shown here.
  • the door leaf 34 can be retracted with its heat-sensitive silicone gaskets 58 and 60 in the furnace tunnel 14 in the transition region 22 without the silicone gaskets 58, 60 are destroyed at the temperatures prevailing in the furnace tunnel 14 temperatures of up to 1800 ° C, the silicone gaskets 58 and 60 are protected from the high temperatures.
  • the gate unit 24 comprises a protective cover 80 with two partial covers 82, one of which is arranged on each major surface side of the door leaf 34.
  • each Part cover 82 comprises as a cooling structure a U-shaped hollow profile 84, whose one side portion 86 is connected at its free end with a water inlet 88 and the other side portion 90 at its free end with a water outlet 92, so that the hollow section 84 can be flowed through with cooling water ,
  • the water inlet 88 and the water outlet 92 are formed as flexible hoses, whereby a relative movement of the protective cover 80 opposite to this is possible.
  • the lower portion 94 of the hollow profile 84 connecting the side portions 86 and 90 is parallel to the lower edge 46 of the door leaf 34.
  • the side portions 86 and 90 of the hollow profile 84 are offset inwardly from the vertical portions of the silicone gasket 58.
  • the hollow profile 84 and the area framed therefrom are of a heat protection mat 96 of e.g. Graphite felt covered, which extends in the vertical direction from the lower portion 94 of the hollow profile 84 to just below the junctions to the water inlet 88 and the water outlet 92 of the side portions 86 and 90 of the hollow section 84.
  • the heat shield mat 96 carries at its upper edge a projecting cover 100.
  • the lining of refractory material 28 coaxial with the passage 48 in the furnace housing 12 has a passage 102 whose cross section is selected so that only a small distance to the heat shields 96 of the protective cover 80 remains.
  • the protective cover 80 can be moved together with the door leaf 34 in the vertical direction, but in turn is vertically movable relative to the door leaf 34. This is for each Operaableung 82 provided for the sake of clarity, servo motor not shown.
  • the protective cover 80 assumes a vertical position, in which the lower portion 94 of the hollow profile 84 is flush with the lower edge 46 of the door leaf 34 below.
  • the lower portion 94 of the hollow profile 84 covers the parallel to the lower edge 46 of the door leaf 34 extending portion of the silicone seal 58 from.
  • a ceiling flap 104 is provided in the transition region 22 in the in FIG. 1 shown open position of the door leaf 34 projects this and the protective cover 80 through the passage 48 in the furnace housing 12 and the passage 102 in the refractory material 28 a little into the transition region 22 in the furnace tunnel 14 into it.
  • a ceiling flap 104 is provided in the transition region 22 in the furnace tunnel 14 into it.
  • This can by means of a servo motor, not shown, between an upper position in which it is present in a horizontal plane just below the passage 102 in the refractory material 28 (see. FIG. 1 ) and a folded down position in which it clears the way for the door leaf 34 with the protective cover 80 into the furnace tunnel 14 (see. FIG. 3 ), are pivoted.
  • the axis of rotation of the ceiling flap 104 is arranged in the transition region 22 on the side of the first furnace zone 18 and extends in a horizontal plane perpendicular to the conveying direction 16.
  • a two-leaf door 106 is further arranged.
  • Their door flaps 106a, 106b can be pivoted by means of a servo motor 108 about a respective vertical axis of rotation, which is arranged in the transition region 22 on the side of the second furnace zone 20, between a first position and a second position.
  • the door flaps 106a, 106b are arranged parallel to the conveying direction 16 (cf. FIG. 1 ), whereas in the second Position are arranged perpendicular to the conveying direction 16 (see. Figures 3 and 4 ).
  • the bottom receptacle 78 can be covered or released in the transition region 22 by a double-leaf bottom flap 110.
  • the bottom flap 110 comprises two curved wing flaps 112, 114, which are arranged such that their outwardly curved surfaces point into the interior of the furnace tunnel 14.
  • the wing flaps 112 and 114 extend along the bottom receptacle 78 between the guide ribs 68 and 70 disposed on each side of the furnace tunnel 14.
  • the wing flaps 112, 114 abut each other in the covering position of the bottom flap 110 with their opposite longitudinal sides FIG. 1 can be seen.
  • guide rails 116 pointing downwards are attached to the wing flaps 112, 114.
  • Whose end of the wing flaps 112, 114 remote end is rotatably mounted about a horizontal axis of rotation, which is perpendicular to the conveying direction 16.
  • the door housing 50 has an intermediate ceiling 120 with a passage 122 through which the door leaf 34 passes.
  • the false ceiling 120 is arranged at such a height that when the door leaf 34 its in FIG. 3 shown closed position, which are flanked along the upper edge 44 of the door leaf 34 extending portions of the silicone gaskets 58 and 60 of the respective adjacent inner circumferential surface of the passage 122.
  • the passage 122 is dimensioned such that the inflated silicone seals 58, 60 seal against the inner circumferential surface of the passage 122.
  • the door housing 50 is divided into an upper space 124 and a lower space 126.
  • a holding-down device 128 with two pressure elements 130 cooperating with the holding plates 98 of the protective cover 80.
  • the hold-down device also comprises a position sensing unit 132.
  • the gate unit 24 further comprises a sensor unit 134 for detecting a driving position of the door leaf 34 Components will be discussed again below.
  • the upper space 124 in the door housing 50 can be evacuated via lines 136 shown only schematically or acted upon by a gaseous medium. Corresponding lines 138 also lead to the lower space 126 in the door housing 50, wherein each of the main surfaces 36 and 38 of the door leaf 34 adjacent portion of the lower space 126 can be evacuated separately or flooded.
  • a differential pressure device 140 is provided, which can measure a pressure difference in the lower space 126 of the door housing 50 on the side of the main surface 36 of the door leaf 34 and the first furnace zone 18.
  • a corresponding differential pressure measuring device 142 is provided to detect a pressure difference between the lower space 126 in the door housing 50 on the side of the main surface 38 of the door leaf 34 and the second furnace zone 20.
  • the furnace zones 18 and 20 In order for the furnace zones 18 and 20 to be exposed to different gases, the furnace zones 18 and 20 must be separated from each other in a gastight manner.
  • the protective cover 80 is entrained in such a way that the lower portion 94 of the hollow profile 84 traversed by cooling water is always arranged at a height with and in front of the portion of the silicone seal 58 or 60, which runs parallel to the lower edge 46 of the door leaf 34.
  • the wing flaps 112, 114 of the bottom flap 110 are pivoted by means of the servomotor 118, so that the bottom receptacle 78 is released in the transition region 22 of the furnace tunnel 14.
  • the door leaf 34 and the protective cover 80 travel together in the above-described relative position in the furnace tunnel 14 until the lower portions 94 of the hollow sections 84 of the protective cover 80 come to lie on the bottom ribs 74 and 76 of the bottom receptacle 78, whereby the movement the protective cover 80 is stopped. However, the door leaf 34 is driven a little further down until the parallel to the lower edge 46 of the door leaf 34 extending portions of the silicone gaskets 58 and 60 are flanked by the bottom ribs 74 and 76 of the bottom receptacle 78.
  • the portions of the silicone gaskets 58 and 60 which are parallel to the side edges 40 and 42 of the door leaf 34, respectively between the guide ribs 68 and 70 of the guide structure 66.
  • the inwardly offset side portions 86 and 90 of the hollow profile 84 offer a shield against the heat radiation from the furnace tunnel 14, whereby the temperature of the silicone gaskets 58 and 60 in their vertical sections is always kept below the maximum maximum temperature for them.
  • the folded down ceiling flap 104 and the closed double-leaf door 106 shield the furnace zones 18 and 20 from the water-cooled door leaf 34 as well as the likewise water-cooled protective cover 80 so that objects to be burned which are arranged adjacent to the transition zone 22 in the furnace zones 18, 20 none or experience only a slight cooling.
  • This shielding is effective, in particular, for the reason that both the ceiling flap 104 and the doors of the double-leaf door 106 always turn to the same outer surface in the interior of the furnace tunnel 14, regardless of which position they occupy. In this way, cold or colder surfaces in the furnace tunnel 14 are largely avoided.
  • the silicone gaskets 58 and 60 are inflated so that they against the bottom ribs 74, 76, the guide ribs 78, 70 and the inner wall surfaces of the grooves 72nd in the door housing 50 and the respective inner surfaces of the passage 122 of the false ceiling 120 of the door housing 50 formed counter surfaces pressed.
  • the silicone gaskets 58 and 60 so also seal the passage 122 in the false ceiling 120 of the door housing 50, the upper space 124 and the lower space 126 are gas-tight separated from each other. Also, the portions of the lower space 126 of the door housing 50, which are respectively on the side of the main surface 36 and the main surface 38 of the door leaf 34, isolated from each other.
  • the differential pressure measuring devices 140, 142 are provided which compare the pressure prevailing in the door housing 50 with the pressure prevailing in the first furnace zone 18 and in the second furnace zone 20, respectively.
  • a pressure equalization can take place through the lines 136 and 138, so that no lower or higher pressure prevails in the corresponding area of the door housing 50 than in the furnace zones 18 and 20, respectively.
  • the cover 100 rests on the heat protection mats 96 of the protective cover 80 from the outside on the refractory material 28 in the region of the passage 48 in the furnace housing 12. As a result, a supplementary shielding of the door housing 50 with respect to the furnace tunnel 14 is formed.
  • the protective cover 80 is prevented from immediately moving upwards in the event of, for example, jamming with the door leaf 34.
  • the lower portions 94 of the hollow sections 84 above the parallel to the lower edge 46 of the door leaf 34 extending portions of the silicone gaskets 58 and 60 are arranged.
  • the silicon gaskets 58 and 60 would be directly exposed to the hot furnace atmosphere and the thermal radiation during start-up of the door leaf 34 and would be destroyed.
  • the correspondingly positioned sensor 134 is responsive to determining the entrainment position of the door leaf 34. Due to an output signal of the same, the hold-down device 128 is driven such that the pressure elements 130 their in FIG. 1 occupy the position shown and release the retaining plates 98 of the protective cover 80. In the course of the protective cover 80 is driven together with the door leaf 34 upwards, the lower portions 94 of the hollow profile 84, the silicone gaskets 58 and 60 always shield from the hot furnace atmosphere and thereby before the heat generated in the furnace tunnel 14 heat radiation.
  • the ceiling flap 104 is folded up again, so that the passage 102 in the refractory material 28 and thus the lower edge 46 and the cool lower portions 94 of the hollow sections 84 are shielded against heat radiation.
  • the door 106 between the transition region 22 and the furnace zone 24 is opened again.
  • bottom flap 110 shields the firing material moved therefrom from excessive cooling by the colder region below when the firing material is transferred from the first furnace zone 18 into the second furnace zone 20.
  • the silicone gaskets 58 and 60 of the door leaf 34 can be driven through the furnace tunnel 14, although the temperature therein is considerably higher than the maximum working temperature of the silicone gaskets 58 and 60 actually allows. In this way, the path between the furnace zones 18 and 20 can be released without the atmosphere in the furnace tunnel 14 having to be cooled beforehand.
  • the door leaf 34 can only on one of its major surfaces 36 or 38 with a Seal 58 or 60 provided and provided there corresponding to a partial shield 82.
  • the gate unit 24 may be used, for example, at the entrance or exit of the vacuum furnace 10.
  • a non-inflatable seal may also be provided in each case.
  • a pressing device can additionally be integrated into the door leaf 34, by means of which the seal in the closed position of the door leaf 34 is pressed against the corresponding mating surfaces of the guide structure 66 in order to achieve a sealing effect.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Tunnel Furnaces (AREA)
  • Furnace Details (AREA)
  • Surface Heating Bodies (AREA)
  • Electric Stoves And Ranges (AREA)

Abstract

The invention relates to a gate unit for gas-tight sealing of two adjacent high temperature zones within a high temperature oven, comprising a gate panel displaceable between an open position and a closed position within a guide structure. At least one sealing element is transported with the gate panel. Protecting means can be transported by the gate panel over at least one part of a transport path of the same, by which at least one segment of the sealing element can be protected over at least one part of the displacement path of the gate panel against influences harmful to the sealing element particularly against radiant heat. The invention further relates to a high temperature oven having an oven tunnel comprising a first high temperature zone and a second high temperature zone. The gate panel is disposed in a transition region between the first and the second high temperature zones.

Description

Die Erfindung betrifft eine Toreinheit zum gasdichten Abtrennen zweier benachbarter Hochtemperaturbereiche innerhalb eines Hochtemperaturofen, welche umfasst:

  1. a) ein Torblatt, welches zwischen einer Offenstellung und einer Schließstellung verfahrbar ist;
  2. b) eine Führungsstruktur, innerhalb welcher das Torblatt entlang eines Verfahrweges verfahrbar ist;
  3. c) wenigstens ein Dichtelement, welches von dem Torblatt mitgeführt wird.
The invention relates to a gate unit for the gas-tight separation of two adjacent high-temperature areas within a high-temperature furnace, which comprises:
  1. a) a door leaf, which is movable between an open position and a closed position;
  2. b) a guide structure, within which the door leaf along a travel path is movable;
  3. c) at least one sealing element, which is carried by the door leaf.

Außerdem betrifft die Erfindung einen Hochtemperaturofen mit

  1. a) einem Ofentunnel, welcher eine erste Hochtemperaturzone und eine zweite Hochtemperaturzone umfasst;
  2. b) einer in einem Übergangsbereich zwischen der ersten und der zweiten Hochtemperaturzone angeordneten Toreinheit, durch welche die Hochtemperaturzonen gasdicht voneinander abtrennbar sind.
Moreover, the invention relates to a high-temperature furnace with
  1. a) an oven tunnel comprising a first high temperature zone and a second high temperature zone;
  2. b) a arranged in a transition region between the first and the second high temperature zone gate unit, through which the high temperature zones are gas-tight separated from each other.

Derartige Hochtemperaturöfen werden in Form von Vakuumöfen zum Brennen von Gegenständen verwendet, die in aufeinanderfolgenden Ofenzonen in verschiedenen Gasatmosphären mit teils sehr niedrigen Gasdrücken gebrannt werden müssen. In solchen Hochtemperaturöfen können beim Brennvorgang Temperaturen von bis zu 1800 °C herrschen.Such high temperature furnaces are used in the form of vacuum furnaces for firing articles which have to be fired in successive furnaces in different gas atmospheres with partly very low gas pressures. In such high-temperature furnaces temperatures of up to 1800 ° C can prevail during the firing process.

Es gibt Brenngut, welches in einer ersten Ofenzone in einer ersten Gasatmosphäre gebrannt wird und danach eine zweite Ofenzone überführt werden muss, in welcher es in einer zweiten, anderen Gasatmosphäre gebrannt werden kann. Während des Brennvorganges, bei dem in den aufeinanderfolgenden Ofenzonen unterschiedliche Gasatmosphären herrschen, sind diese beiden Ofenzonen durch das Torblatt einer eingangs erwähnten Toreinheit gasdicht voneinander getrennt.There is kiln, which is burned in a first furnace zone in a first gas atmosphere and then a second Of furnace zone must be transferred, in which it can be fired in a second, different gas atmosphere. During the firing process, in which different gas atmospheres prevail in the successive furnace zones, these two furnace zones are separated from one another in a gas-tight manner by the door leaf of a gate unit mentioned at the beginning.

Als Dichtelement wird bei bekannten Toreinheiten beispielsweise eine Silikondichtung verwendet, die eine Temperaturbeständigkeit von 240 °C bis maximal 300 °C aufweist. Wenn nun Brenngut von einer Ofenzone in die nächste überführt werden muss, müssen die beiden einander benachbarten Ofenzonen zunächst evakuiert werden, damit es nicht zu einer ungewollten Gasdurchmischung beim Öffnen des Torblatts kommt. Gegebenenfalls können die Ofenzonen vor Öffnen des Torblatts mit einem Inertgas geflutet werden.As a sealing element, for example, a silicone gasket is used in known door units, which has a temperature resistance of 240 ° C to a maximum of 300 ° C. If now firing material has to be transferred from one furnace zone to the next, the two adjacent furnace zones must first be evacuated, so that unwanted gas mixing does not occur when the gate leaf is opened. Optionally, the furnace zones may be flooded with an inert gas prior to opening the door leaf.

Unabhängig davon, ob die Toreinheit in einem Vakuumofen verwendet wird oder nicht, müssen die beiden einander benachbarten Ofenzonen vor dem Öffnen des Torblatts auf dasselbe Druckniveau gebracht werden. Auch bei nicht unter niedrigem Druck betriebenen Öfen, bei denen zwei einander benachbarte Ofenzonen während des Brennvorgangs mit verschiedenen Betriebsgasen geflutet sind, müssen diese zwei eine Schleusenkammer einschließenden Ofenzonen dann vor dem Öffnen des Torblatts evakuiert werden; im Anschluss muss ein Druckausgleich erfolgen, wozu die Ofenzonen gegebenenfalls mit einem Inertgas gefüllt werden können.Regardless of whether the door unit is used in a vacuum oven or not, the two adjacent oven zones must be brought to the same pressure level before opening the door leaf. Also, in non-low pressure furnaces, where two adjacent furnace zones are flooded with different operating gases during firing, these two furnace zones enclosing a lock chamber must then be evacuated prior to opening the gate; Afterwards, a pressure equalization must be carried out, for which purpose the furnace zones can optionally be filled with an inert gas.

Wird nun das Torblatt in seine Offenstellung gebracht, um den Weg zwischen den beiden aneinander angrenzenden Ofenzonen freizugeben, so durchfährt zumindest ein Abschnitt der Dichtung den heißen Ofentunnel.Now, if the door leaf is brought into its open position to release the path between the two adjacent furnace zones, at least a portion of the seal passes through the hot furnace tunnel.

Damit dieser Abschnitt der Dichtung dabei keiner für sie schädlichen Wärmestrahlung ausgesetzt wird, wird die Temperatur im Ofentunnel bekannter Hochtemperaturöfen vorher auf eine Temperatur abgesenkt, bei welcher die Silikondichtung keinen Schaden erleidet. Dabei sind beispielsweise noch Temperaturen von bis zu 550 °C möglich, wenn die Silikondichtung dieser Temperatur nur kurzzeitig ausgesetzt wird, was beim Hoch- oder Niederfahren des Torblatts der Fall ist.Thereby none of this section of the seal is for her is exposed to harmful heat radiation, the temperature in the furnace tunnel known Hochtemperaturöfen is previously lowered to a temperature at which the silicone gasket suffers no damage. For example, temperatures of up to 550 ° C are still possible if the silicone gasket is exposed to this temperature for only a short time, which is the case when the door leaf is raised or lowered.

Nach dem Überführen des Brennguts von der ersten Ofenzone in die zweite Ofenzone wird das Torblatt wieder geschlossen und der Ofen muss entsprechend wieder auf seine Betriebstemperatur von 1500 °C bis 1800 °C aufgeheizt werden.After transferring the fuel from the first furnace zone in the second furnace zone, the door leaf is closed again and the oven must be heated accordingly back to its operating temperature of 1500 ° C to 1800 ° C.

Durch das Absenken der Temperatur und das sich daran anschließende Aufheizen dauert der Vorgang des Überführens von Brenngut von einer Ofenzone zur nächsten verhältnismäßig lange und ist darüber hinaus entsprechend energieaufwändig.By lowering the temperature and the subsequent heating, the process of transferring fuel from one furnace zone to the next takes a relatively long time and is also correspondingly energy-consuming.

Aufgabe der Erfindung ist es daher, eine Toreinheit und einen Hochtemperaturofen der eingangs genannten Art zu schaffen, durch welche bzw. bei welchem die Überführung von Brenngut von einer ersten Ofenzone in eine zweite Ofenzone schneller und unter geringerem Energiebedarf erfolgen kann.The object of the invention is therefore to provide a door unit and a high-temperature furnace of the type mentioned, by which or in which the transfer of fuel from a first furnace zone in a second furnace zone can be done faster and with less energy.

Diese Aufgabe wird im Hinblick auf die Toreinheit der eingangs genannten Art dadurch gelöst, dass

  • d) Schutzmittel vorgesehen sind, welche über wenigstens einen Teil des Verfahrweges des Torblatts von diesem mitführbar sind und durch welche wenigstens ein Abschnitt des Dichtelements über wenigstens einen Teil des Verfahrwegs des Torblatts gegen einen für das Dichtelement schädliche Wärmestrahlung abschirmbar ist.
This object is achieved with regard to the door unit of the type mentioned in that
  • d) protection means are provided, which are entrained over at least a part of the travel path of the door leaf and by which at least a portion of the sealing element over at least a portion of the travel path of the door leaf against a harmful heat radiation for the sealing element can be shielded.

Der schädliche Einfluss ist bei Hochtemperaturöfen und besonders bei Vakuumöfen insbesondere durch Wärmestrahlung gegeben, welche auf das Dichtelement treffen kann. Bei bekannten Vakuumöfen werden Strahlungsleistungen von bis zu 500 kW/m2 erreicht.The harmful influence is given in high-temperature furnaces and especially in vacuum furnaces, in particular by thermal radiation, which can strike the sealing element. In known vacuum furnaces radiation powers of up to 500 kW / m 2 are achieved.

Dadurch, dass ein Abschnitt des Dichtelements, welcher beim Absenken oder Anheben des Torblatts der Ofenatmosphäre ausgesetzt ist, durch die Schutzmittel abgeschirmt ist, muss die Ofentemperatur nicht mehr abgesenkt werden, bevor das Torblatt zwischen seiner Offenstellung und seiner Schließstellung verfahren werden kann. Das Torblatt kann also bei normaler Betriebstemperatur des Hochtemperaturofens verfahren werden, ohne dass das Dichtelement Schaden nimmt. Dadurch ist der gesamte Zeitraum, der für die Überführung von Brenngut von einer ersten Ofenzone in eine dazu benachbarte zweite Ofenzone benötigt wird, verkürzt, da weder eine Abkühlphase noch eine Phase zum Wiederaufheizen des Ofentunnels erforderlich ist. Darüber hinaus wird insbesondere die Energie gespart, welche zum bislang notwendigen Wiederaufheizen aufgewendet werden musste.The fact that a portion of the sealing element, which is exposed to the furnace atmosphere during lowering or lifting of the door, is shielded by the protective means, the oven temperature must not be lowered before the door leaf between its open position and its closed position can be moved. The door leaf can therefore be moved at normal operating temperature of the high-temperature furnace without the sealing element being damaged. As a result, the entire period of time required for the transfer of combustible material from a first furnace zone into a second furnace zone adjacent thereto is shortened since neither a cooling phase nor a phase for reheating the furnace tunnel is required. In addition, in particular the energy is saved, which had to be expended to the previously necessary reheating.

Vorteilhafte Weiterbildungen sind in den Unteransprüchen angegeben.Advantageous developments are specified in the subclaims.

Im Hinblick auf die Abschirmung gegen Wärmestrahlung ist es besonders vorteilhaft, wenn die Schutzmittel als Kühlstruktur ausgebildet sind, durch welche wenigstens ein Abschnitt des Dichtelements gegen Wärmestrahlung abschirmbar ist.With regard to the shielding against thermal radiation, it is particularly advantageous if the protective means are designed as a cooling structure, by which at least a portion of the sealing element can be shielded against heat radiation.

Dabei hat es sich als günstig erwiesen, wenn die Kühlstruktur ein von einem Kühlmedium durchströmbares Hohlprofil ist. Als Kühlmedium wird vorzugsweise Wasser verwendet.It has proved to be advantageous if the cooling structure is a hollow profile through which a cooling medium can flow. As the cooling medium, water is preferably used.

Es kann günstig sein, wenn die Schutzmittel relativ gegenüber dem Torblatt bewegbar sind. Dies kann beispielsweise dazu dienen, dass wenigstens ein Abschnitt des Dichtelements in der Schließstellung des Torblatts von den Schutzmitteln freigebbar ist. So kann der bestreffende Abschnitt des Dichtelements in der Schließstellung des Torblatts z.B. durch stationäre bauliche Maßnahmen, wie einer gekühlten Gegenfläche, gegenüber Wärmestrahlung geschützt werden, die am Ofen vorgesehen sind, in welchem die Toreinheit verwendet wird.It may be beneficial if the protection means are relatively opposite the door leaf are movable. This can serve, for example, that at least a portion of the sealing element in the closed position of the door leaf of the protection means is releasable. Thus, the pertinent portion of the sealing element in the closed position of the door leaf, for example by stationary structural measures, such as a cooled counter surface, be protected against thermal radiation, which are provided on the oven, in which the gate unit is used.

Es hat sich als vorteilhaft erwiesen, wenn das Torblatt eine erste Hauptfläche und eine parallel dazu verlaufende zweite Hauptfläche hat, wobei in wenigstens dem Randbereich wenigstens einer Hauptfläche eine umlaufende Nut eingelassen ist, in welcher ein Dichtring einsitzt.It has proved to be advantageous if the door leaf has a first main surface and a second main surface extending parallel thereto, wherein in at least the edge region of at least one main surface a circumferential groove is recessed, in which a sealing ring is seated.

Wenn der Dichtring schlauchförmig sowie aufblasbar und entleerbar ist, kann der Dichtring in entleertem und dadurch erschlafftem Zustand unterhalb der Hauptfläche des Torblatts verlaufen, in welcher die entsprechende Nut eingelassen ist. Im aufgeblasenen Zustand drückt sich der Dichtring dann aus der Nut heraus über die entsprechende Hauptfläche des Torblatts hinaus und kann so gegen die entsprechende Gegenfläche abdichten.If the sealing ring is tubular and can be inflated and emptied, the sealing ring can run in deflated and thus slackened state below the main surface of the door leaf, in which the corresponding groove is recessed. In the inflated state, the sealing ring then presses out of the groove beyond the corresponding main surface of the door leaf and can thus seal against the corresponding counter surface.

Es ist baulich günstig, wenn das Dichtelement mit durch die Führungsstruktur gebildeten Gegenflächen zusammenarbeitet. Wenn die Führungsstruktur beispielsweise als Führungsschiene mit einem nach innen geöffneten U-Profil ausgebildet ist, so können die Innenflanken des U-Profils als Gegenfläche für das Dichtelement dienen.It is structurally favorable if the sealing element cooperates with counter surfaces formed by the guide structure. If the guide structure is formed, for example, as a guide rail with an inwardly open U-profile, then the inner edges of the U-profile can serve as a counter surface for the sealing element.

Um auch den Abschnitt des Dichtelements, welcher beim Durchfahren des Torblatts durch den Ofentunnel hindurch mit der Ofenatmosphäre in Kontakt kommt, in der Schließstellung des Torblatts eine Gegenfläche zu bieten, ist es günstig, wenn die Führungsstrüktur einer senkrecht zu Verfahrrichtung des Torblatts verlaufende Aufnahme umfasst, von welcher das Torblatt mit wenigstens einem Abschnitt des Dichtelements aufgenommen ist, wenn es seine Schließstellung einnimmt.To also the portion of the sealing element, which comes through the furnace tunnel when passing through the furnace tunnel with the furnace atmosphere in contact, in the closed position of the Door leaf to offer a counter surface, it is advantageous if the Führungsstrüktur comprises a perpendicular to the direction of travel of the door leaf receiving, of which the door leaf is received with at least a portion of the sealing element when it assumes its closed position.

Um eine Abschirmwirkung der Schutzmittel auch in der Schließstellung des Torblatts aufrecht zu erhalten, ist es günstig, wenn die Schutzmittel in der Schließstellung des Torblatts näher an der abzuschirmenden Atmosphäre angeordnet sind als der abzuschirmende Abschnitt des Dichtelements.In order to maintain a shielding effect of the protective means even in the closed position of the door leaf, it is advantageous if the protective means are arranged in the closed position of the door leaf closer to the atmosphere to be shielded than the portion of the sealing element to be shielded.

Im Hinblick auf den Hochtemperaturofen der eingangs genannten Art wird die oben erläuterte Aufgabe dadurch gelöst, dass

  • c) als Toreinheit die Toreinheit nach einem der Ansprüche 1 bis 10 vorgesehen ist.
With regard to the high-temperature furnace of the type mentioned above, the above-described object is achieved in that
  • c) as a gate unit, the gate unit is provided according to one of claims 1 to 10.

Die damit verbundenen Vorteile entsprechen den oben zur Toreinheit erläuterten Vorteilen.The associated advantages correspond to the advantages explained above for the gate unit.

Bei einem Hochtemperaturofen ist es vorteilhaft, wenn Führungsstruktur-Abschirmmittel, welche im Bereich des Ofentunnels verlaufende Abschnitte der Führungsstruktur gegen die Atmosphäre im Ofentunnel abschirmen, wenn das Torblatt seine Offenstellung einnimmt, und/oder Torblatt-Abschirmmittel vorgesehen sind, welche das Torblatt gegen die Atmosphäre im Ofentunnel abschirmen, wenn das Torblatt seine Offenstellung einnimmt.In a high-temperature furnace, it is advantageous if guide-structure shielding means which shield portions of the guide structure extending in the region of the furnace tunnel from the atmosphere in the furnace tunnel when the door leaf is in its open position and / or Torblatt shielding means are provided, which the door leaf against the atmosphere shield in the furnace tunnel when the door leaf is in its open position.

Auf diese Weise kann verhindert oder zumindest vermieden werden, dass sich Abschnitte der Führungsstruktur durch Wärmestrahlung aufheizen, die nachfolgend wieder mit dem Dichtelement in Kontakt kommen und dieses zerstören würden, wenn sie zu heiß würden. Durch die Abschirmung des Torblatts kann die Gefahr verringert werden, dass sich das Torblatt durch Wärmestrahlung selbst - gegebenenfalls nur in einem Randbereich - derart aufheizt, dass die von dem Torblatt mitgeführte Dichtung zerstört wird.In this way, it can be prevented or at least avoided that heat up portions of the guide structure by heat radiation, which subsequently come back into contact with the sealing element and would destroy it, if they would get too hot. By shielding the door leaf, the risk can be reduced that the door leaf by heat radiation itself - possibly only in an edge region - heats up so that the entrained by the door leaf seal is destroyed.

Dies kann vorteilhaft verwirklicht werden, indem die Führungsstruktur-Abschirmmittel und/oder die Torblatt-Abschirmmittel verschwenkbare Abschirmklappen umfassen.This can be realized advantageously in that the guide structure shielding means and / or the door leaf shielding means comprise pivotable shielding flaps.

Diese Abschirmklappen können vorteilhaft so angeordnet sein, dass sie eine Stellung einnehmen, in welcher sie das Torblatt gegen die in den Ofenzonen herrschenden Atmosphären abschirmen, wenn das Torblatt seine Schließstellung einnimmt; insbesondere kann dadurch auch eine Abschirmung des Torblatts gegen Wärmestrahlung gewährleistet sein. Anders ausgedrückt liegen die Abschirmklappen und das geschlossene Torblatt in einer Art Sandwich-Ordnung entlang des Ofentunnels vor, wenn das Torblatt seine Schließstellung einnimmt. Auf diese Weise führt das gegenüber den Ofenzonen kühlere Torblatt oder die kühlere außenliegende Oberfläche einer Wärmedämmung des Torblatts zu einer geringeren Abkühlung in seiner bzw. ihrer Nachbarschaft.These shielding flaps can advantageously be arranged to assume a position in which they shield the door leaf against the atmospheres prevailing in the furnace zones when the door leaf assumes its closed position; In particular, a shielding of the door leaf against heat radiation can be ensured thereby. In other words, the shielding flaps and the closed door leaf are in a kind of sandwich-order along the furnace tunnel when the door leaf assumes its closed position. In this way, compared to the furnace zones cooler door leaf or the cooler outer surface of a heat insulation of the door leaf leads to less cooling in his or her neighborhood.

Im Hinblick auf die Führungsstruktur-Abschirmmittel, welche das Torblatt flankierende Abschnitte der Führungsstruktur und auch die oben erwähnte Aufnahme abschirmen können, ist es günstig, wenn diese wenigstens eine Einrichtung mit zwei Klappen umfassen, welche jeweils um eine Drehachse verschwenkbar sind, die parallel zu von den Klappen abzuschirmenden Abschnitten der Führungsstruktur verläuft.With regard to the guide structure shielding means, which can shield the door leaf flanking portions of the guide structure and also the above-mentioned recording, it is advantageous if these comprise at least one device with two flaps, which are each pivotable about an axis of rotation which is parallel to the flaps to be shielded sections of the guide structure extends.

Nachstehend wird ein Ausführungsbeispiel der Erfindung anhand der beigefügten Zeichnungen näher erläutert. In diesen zeigen:

Figur 1
einen Längsschnitt durch einen Vakuumofen im Bereich einer Toreinheit mit einem Torblatt, mittels welchem zwei aufeinanderfolgende Ofenzonen des Vakuumofens gasdicht voneinander getrennt werden können, wobei das Torblatt in seiner Offenstellung gezeigt ist;
Figur 2
einen Schnitt durch den Vakuumofen von Figur 1 senkrecht zu dessen Längsrichtung, wobei eine Wärmedämmung des Torblatts teilweise weggebrochen gezeigt ist;
Figur 3
einen der Figur 1 entsprechenden Längsschnitt durch den Vakuumofen, wobei das Torblatt in seiner Schließstellung gezeigt ist;
Figur 4
einen Schnitt durch den Vakuumofen von Figur 3 entlang der dortigen Schnittlinie IV-IV; und
Figur 5
einen der Figur 2 entsprechenden Schnitt durch den Vakuumofen von Figur 3.
Hereinafter, an embodiment of the invention will be explained in more detail with reference to the accompanying drawings. In these show:
FIG. 1
a longitudinal section through a vacuum furnace in the region of a door unit with a door leaf, by means of which two successive furnace zones of the vacuum furnace can be separated from each other gas-tight, wherein the door leaf is shown in its open position;
FIG. 2
a section through the vacuum oven of FIG. 1 perpendicular to its longitudinal direction, wherein a heat insulation of the door leaf is shown partially broken away;
FIG. 3
one of the FIG. 1 corresponding longitudinal section through the vacuum furnace, wherein the door leaf is shown in its closed position;
FIG. 4
a section through the vacuum oven of FIG. 3 along the section line IV-IV; and
FIG. 5
one of the FIG. 2 corresponding section through the vacuum furnace of FIG. 3 ,

In den Figuren ist mit 10 insgesamt ein evakuierbarer Vakuumofen mit einem Ofengehäuse 12 bezeichnet. Durch das Ofengehäuse hindurch erstreckt sich ein Ofentunnel 14. Dieser weist in der durch einen Pfeil dargestellten Förderrichtung 16 aufeinander folgende verschiedene Ofenzonen auf, in denen unterschiedliche Gasatmosphären mit teils sehr niedrigen Gasdrücken herrschen können, wie es an und für sich bekannt ist.In the figures, a total of 10 evacuated vacuum furnace with a furnace housing 12 is designated. A furnace tunnel 14 extends through the furnace housing. In the conveying direction 16 shown by an arrow, the latter has successive different furnace zones in which different gas atmospheres with partly very low gas pressures can prevail, as is known in and of itself.

Von solchen verschiedenen Ofenzonen sind in den Figuren 1, 3 und 4 zwei in Förderrichtung 16 aufeinander folgende Ofenzonen in Form einer ersten Ofenzone 18 und einer zweiten Ofenzone 20 gezeigt, zwischen denen ein Übergangsbereich 22 angeordnet ist.Of such different furnace zones are in the FIGS. 1 . 3 and 4 two successive furnace zones in the conveying direction 16 in the form of a first furnace zone 18 and a second furnace zone 20, between which a transition region 22 is arranged.

Mittels einer weiter unten näher erläuterten Toreinheit 24 kann der Übergangsbereich 22 zwischen den Ofenzonen 18 und 20 wahlweise freigegeben oder verschlossen werden, wobei die Ofenzonen 18 und 20 im letzteren Fall gasdicht voneinander getrennt sind.By means of a door unit 24 explained in more detail below, the transition region 22 between the furnace zones 18 and 20 can be selectively released or closed, with the furnace zones 18 and 20 being separated from one another gas-tight in the latter case.

Entlang des Ofentunnels 14 sind senkrecht zur Förderrichtung 16 und horizontal verlaufende antreibbare Rollen 26 angeordnet, welche außerhalb des Ofengehäuses 12 verdrehbar gelagert sind. Mittels der Rollen 26 wird Brenngut durch den Ofentunnel 14 gefördert, wozu das Brenngut unmittelbar auf den Rollen 26 ruhen oder in entsprechenden Brenngestellen oder -gefäßen durch den Vakuumofen 10 geführt werden kann.Along the furnace tunnel 14 are arranged perpendicular to the conveying direction 16 and horizontally extending drivable rollers 26 which are rotatably mounted outside of the furnace housing 12. By means of the rollers 26, kiln material is conveyed through the kiln tunnel 14, for which purpose the kiln can rest directly on the rollers 26 or can be guided through the vacuum kiln 10 in appropriate fueling stations or vessels.

Das Ofengehäuse 12 ist im Bereich des Ofentunnels 14 innen mit einem feuerfesten Material 28 ausgekleidet, welches Betriebstemperaturen des Vakuumofens 10 von bis zu 1800 °C ermöglicht. Das Bodenniveau der beiden Ofenzonen 18 und 20 liegt in einer gemeinsamen horizontalen Bodenebene 30, wogegen der Boden 32 im Übergangsbereich 22 zwischen den Ofenzonen 18 und 20 gegenüber der Bodenebene 30 abgesenkt ist.The furnace housing 12 is lined in the area of the furnace tunnel 14 inside with a refractory material 28, which allows operating temperatures of the vacuum furnace 10 of up to 1800 ° C. The floor level of the two furnace zones 18 and 20 lies in a common horizontal floor level 30, whereas the floor 32 in the transition area 22 between the furnace zones 18 and 20 is lowered relative to the floor level 30.

Die Toreinheit 24 umfasst ein Torblatt 34 mit zwei gegenüberliegenden senkrecht zur Förderrichtung 16 verlaufenden Hauptflächen 36, 38, zwei Seitenrändern 40, 42 sowie einem oberen Rand 44 und einem unteren Rand 46. Das Torblatt 34 erstreckt sich durch einen dem Boden 32 im Übergangsbereich 22 gegenüberliegenden Durchlass 48 im Ofengehäuse 12 nach oben in ein Torgehäuse 50. An seinem oberen Rand 44 ist das Torblatt 34 mit einer nicht weiter interessierenden pneumatischen Hubeinrichtung 52 verbunden. Durch diese kann das Torblatt 34 vertikal zwischen seiner in den Figuren 1 und 2 gezeigten Offenstellung und seiner in den Figuren 3 bis 5 gezeigten Schließstellung verfahren werden.The gate unit 24 comprises a door leaf 34 with two opposite perpendicular to the conveying direction 16 extending main surfaces 36, 38, two side edges 40, 42 and an upper edge 44 and a lower edge 46. The door leaf 34 extends through a bottom 32 in the transition region 22 opposite Passage 48 in the oven housing 12 upwards into a door housing 50. At its upper edge 44, the door leaf 34 is connected to a pneumatic lifting device 52 of no further interest. Through this, the door leaf 34 vertically between his in the FIGS. 1 and 2 shown open position and its in the FIGS. 3 to 5 shown closed position to be moved.

In die Hauptflächen 36 und 38 des Torblatts 34 sind unter weitgehend konstantem Abstand zu dessen Außenrändern 40, 42, 44 und 46 umlaufende Nuten 54 bzw. 56 eingelassen. In die Nuten 54 und 56 ist jeweils eine elastische schlauchförmige aufblasbare Silikondichtung 58 bzw. 60 eingelegt, welche Temperaturen bis maximal etwa 300 °C standhalten kann. Die Silikondichtungen 58 und 60 werden aufgeblasen, indem sie mit Gas durchströmt werden, wozu jeweils hier nicht dargestellte Einlass- und Auslassanschlüsse vorhanden sind.In the main surfaces 36 and 38 of the door leaf 34 at substantially constant distance to the outer edges 40, 42, 44 and 46 circumferential grooves 54 and 56 are recessed. In the grooves 54 and 56, respectively, an elastic tubular inflatable silicone gasket 58 and 60 is inserted, which can withstand temperatures up to about 300 ° C maximum. The silicone gaskets 58 and 60 are inflated by passing through gas, for which purpose inlet and outlet connections, not shown here, are present.

Die Silikondichtungen 58 und 60 sind so dimensioniert, dass sie im erschlafften Zustand, also ohne durch sie hindurch strömendes Gas, unterhalb der Hauptfläche 36 bzw. 38 des Torblatts 34 in der Nut 54 bzw. 56 verlaufen. Im aufgeblasenen Zustand ragen die Silikondichtungen 58 und 60 über die Hauptflächen 36 bzw. 38 des Torblatts 34 hinaus.The silicone seals 58 and 60 are dimensioned so that they run in the slackened state, ie without gas flowing through them, below the main surface 36 and 38 of the door leaf 34 in the groove 54 and 56, respectively. When inflated, the silicone gaskets 58 and 60 protrude beyond the major surfaces 36 and 38 of the door leaf 34, respectively.

Das Torblatt 34 trägt an seinen Seitenrändern 40 und 42 Führungsplatten 62 und 64, welche parallel zur Förderrichtung 16 verlaufen und jeweils über die Hauptfläche 36 und die Hauptfläche 38 des Torblatts 34 überstehen, was in Figur 4 zu erkennen ist.The door leaf 34 carries on its side edges 40 and 42 guide plates 62 and 64, which are parallel to the conveying direction 16 and each protrude beyond the main surface 36 and the main surface 38 of the door leaf 34, which in FIG. 4 can be seen.

Mit diesen Führungsplatten 62 und 64 läuft das Torblatt 34 in einem vertikalen Abschnitt einer Führungsstruktur 66. Der vertikale Abschnitt der Führungsstruktur 66 ist im Bereich des Ofentunnels 18 durch jeweils zwei auf jeder Seite des Torblatts 34 angeordnete Führungsrippen 68, 70 ausgebildet, die das Torblatt 34 in Förderrichtung 16 gesehen vorne und hinten flankieren (vgl. Figur 4). Im Bereich des Torgehäuses 50 ist der vertikale Abschnitt der Führungsstruktur 66 als rechts und links des Torblatts 34 verlaufende Nut 72 in den hier nicht eigens mit einem Bezugszeichen versehenen, parallel zur Förderrichtung 16 verlaufenden Seitenwänden des Torgehäuses 50 ausgebildet. Die vertikal verlaufenden Abschnitte der Silikondichtungen 58 und 60 im Torblatt 34 sind von den Führungsrippen 68 bzw. 70 (vgl. Figur 4) flankiert bzw. liegen innerhalb der Nuten 72.With these guide plates 62 and 64, the door leaf 34 runs in a vertical section of a guide structure 66. The vertical section of the guide structure 66 is formed in the region of the oven tunnel 18 by two guide ribs 68, 70 arranged on each side of the door leaf 34, which form the door leaf 34 flanked in the conveying direction 16 front and rear (see. FIG. 4 ). In the region of the door housing 50, the vertical portion of the guide structure 66 as extending to the right and left of the door leaf 34 groove 72 in the not provided here with a reference numeral, parallel to the conveying direction 16 extending side walls of the door housing 50 is formed. The vertically extending portions of the silicone seals 58 and 60 in the door leaf 34 are of the guide ribs 68 and 70 (see. FIG. 4 ) flank within the grooves 72.

Am Boden 32 im Übergangsbereich 22 zwischen der ersten Ofenzone 18 und der zweiten Ofenzone 20 sind die sich jeweils auf beiden Seiten des Ofengehäuses 12 gegenüberliegenden Führungsrippen 68 und 70 durch zwischen den Seitenwänden des Ofengehäuses 12 verlaufende Bodenrippen 74 und 76 verbunden. Diese bilden eine Bodenaufnahme 78, in welche das Torblatt 34 mit seinem unteren Rand 46 voraus einfahren kann und welche die Führungsstruktur 66 komplettiert. Wenn das Torblatt 34 in die Bodenaufnahme eingefahren ist, sind die unteren vertikalen Abschnitte der Silikondichtungen 58, 60 von den Bodenrippen 74 bzw. 76 flankiert.At the bottom 32 in the transition region 22 between the first furnace zone 18 and the second furnace zone 20, the respective guide ribs 68 and 70 located on both sides of the furnace housing 12 are connected by bottom ribs 74 and 76 extending between the side walls of the furnace housing 12. These form a bottom receptacle 78, in which the door leaf 34 can retract ahead with its lower edge 46 and which completes the guide structure 66. When the door leaf 34 is retracted into the bottom receptacle, the lower vertical portions of the silicone seals 58, 60 are flanked by the bottom ribs 74 and 76, respectively.

Das Torblatt 34 ist in an und für sich bekannter Weise wassergekühlt. Dazu ist es von einem von Kühlwasser durchströmbaren Kanalsystem durchzogen, was hier nicht näher dargestellt ist.The door leaf 34 is water-cooled in a manner known per se. For this purpose it is traversed by a channeled through by cooling water channel system, which is not shown here.

Damit das Torblatt 34 mit seinen hitzeempfindlichen Silikondichtungen 58 und 60 in den Ofentunnel 14 im Übergangsbereich 22 eingefahren werden kann, ohne dass die Silikondichtungen 58, 60 bei den im Ofentunnel 14 herrschenden Temperaturen von bis zu 1800 °C zerstört werden, müssen die Silikondichtungen 58 und 60 vor den hohen Temperaturen geschützt werden.Thus, the door leaf 34 can be retracted with its heat-sensitive silicone gaskets 58 and 60 in the furnace tunnel 14 in the transition region 22 without the silicone gaskets 58, 60 are destroyed at the temperatures prevailing in the furnace tunnel 14 temperatures of up to 1800 ° C, the silicone gaskets 58 and 60 are protected from the high temperatures.

Dazu umfasst die Toreinheit 24 eine Schutzabdeckung 80 mit zwei Teilabdeckungen 82, von denen jeweils eine auf jeder Hauptflächenseite des Torblatts 34 angeordnet ist. Jede Teilabdeckung 82 umfasst als Kühlstruktur ein U-förmiges Hohlprofil 84, dessen einer Seitenabschnitt 86 an seinem freien Ende mit einem Wasserzulauf 88 und dessen anderer Seitenabschnitt 90 an seinem freien Ende mit einem Wasserablauf 92 verbunden ist, so dass das Hohlprofil 84 mit Kühlwasser durchströmt werden kann. Der Wasserzulauf 88 und der Wasserablauf 92 sind als flexible Schläuche ausgebildet, wodurch eine Relativbewegung der Schutzabdeckung 80 diesen gegenüber möglich ist.For this purpose, the gate unit 24 comprises a protective cover 80 with two partial covers 82, one of which is arranged on each major surface side of the door leaf 34. each Part cover 82 comprises as a cooling structure a U-shaped hollow profile 84, whose one side portion 86 is connected at its free end with a water inlet 88 and the other side portion 90 at its free end with a water outlet 92, so that the hollow section 84 can be flowed through with cooling water , The water inlet 88 and the water outlet 92 are formed as flexible hoses, whereby a relative movement of the protective cover 80 opposite to this is possible.

Der die Seitenabschnitte 86 und 90 verbindende untere Abschnitt 94 des Hohlprofils 84 verläuft parallel zum unteren Rand 46 des Torblatts 34. Die Seitenabschnitte 86 und 90 des Hohlprofils 84 sind gegenüber den vertikalen Abschnitten der Silikondichtung 58 nach innen versetzt angeordnet. Das Hohlprofil 84 und der davon eingerahmte Bereich ist von einer Wärmeschutzmatte 96 aus z.B. Graphitfilz abgedeckt, welche sich in vertikaler Richtung von dem unteren Abschnitt 94 des Hohlprofils 84 bis kurz unterhalb der Verbindungsstellen zum Wasserzulauf 88 bzw. zum Wasserablauf 92 der Seitenabschnitte 86 und 90 des Hohlprofils 84 erstreckt.The lower portion 94 of the hollow profile 84 connecting the side portions 86 and 90 is parallel to the lower edge 46 of the door leaf 34. The side portions 86 and 90 of the hollow profile 84 are offset inwardly from the vertical portions of the silicone gasket 58. The hollow profile 84 and the area framed therefrom are of a heat protection mat 96 of e.g. Graphite felt covered, which extends in the vertical direction from the lower portion 94 of the hollow profile 84 to just below the junctions to the water inlet 88 and the water outlet 92 of the side portions 86 and 90 of the hollow section 84.

An den oberen Stirnseiten der Seitenabschnitte 86 und 90 des Hohlprofils 84 ist eine sich senkrecht zur Hauptfläche 36 des Torblatts 34 erstreckende Halteplatte 98 angeordnet.At the upper end sides of the side portions 86 and 90 of the hollow profile 84 is a perpendicular to the main surface 36 of the door leaf 34 extending retaining plate 98 is arranged.

Die Wärmeschutzmatte 96 trägt an ihrem oberen Rand eine vorstehende Abdeckung 100. Die Auskleidung aus feuerfestem Material 28 weist koaxial zu dem Durchlass 48 im Ofengehäuse 12 einen Durchlass 102 auf, dessen Querschnitt so ausgewählt ist, dass nur ein geringer Abstand zu den Wärmeschutzmatten 96 der Schutzabdeckung 80 verbleibt. Die Schutzabdeckung 80 kann gemeinsam mit dem Torblatt 34 in vertikaler Richtung verfahren werden, ist jedoch ihrerseits gegenüber dem Torblatt 34 vertikal beweglich. Dazu ist für jede Teilabschirmung 82 ein der Übersichtlichkeit halber nicht dargestellter Stellmotor vorgesehen.The heat shield mat 96 carries at its upper edge a projecting cover 100. The lining of refractory material 28 coaxial with the passage 48 in the furnace housing 12 has a passage 102 whose cross section is selected so that only a small distance to the heat shields 96 of the protective cover 80 remains. The protective cover 80 can be moved together with the door leaf 34 in the vertical direction, but in turn is vertically movable relative to the door leaf 34. This is for each Teilabschirmung 82 provided for the sake of clarity, servo motor not shown.

In der in Figur 1 gezeigten Offenstellung des Torblatts 34 nimmt die Schutzabdeckung 80 eine vertikale Position ein, bei welcher der untere Abschnitt 94 des Hohlprofils 84 unten bündig mit dem unteren Rand 46 des Torblatts 34 abschließt. Der untere Abschnitt 94 des Hohlprofils 84 deckt dabei den parallel zum unteren Rand 46 des Torblatts 34 verlaufenden Abschnitt der Silikondichtung 58 ab.In the in FIG. 1 shown open position of the door leaf 34, the protective cover 80 assumes a vertical position, in which the lower portion 94 of the hollow profile 84 is flush with the lower edge 46 of the door leaf 34 below. The lower portion 94 of the hollow profile 84 covers the parallel to the lower edge 46 of the door leaf 34 extending portion of the silicone seal 58 from.

In der in Figur 1 gezeigten Offenstellung des Torblatts 34 ragt dieses und die Schutzabdeckung 80 durch den Durchlass 48 im Ofengehäuse 12 und den Durchlass 102 im feuerfesten Material 28 ein wenig in den Übergangsbereich 22 im Ofentunnel 14 hinein. Im Übergangsbereich 22 ist eine Deckenklappe 104 vorgesehen. Diese kann mittels eines nicht dargestellten Stellmotors zwischen einer oberen Stellung, in welcher sie in einer horizontalen Ebene knapp unterhalb des Durchlasses 102 im feuerfesten Material 28 vorliegt (vgl. Figur 1) und einer herab geklappten Stellung, in welcher sie den Weg für das Torblatt 34 mit der Schutzabdeckung 80 in den Ofentunnel 14 hinein freigibt (vgl. Figur 3), verschwenkt werden. Die Drehachse der Deckenklappe 104 ist im Übergangsbereich 22 auf der Seite der ersten Ofenzone 18 angeordnet und verläuft in einer horizontalen Ebene senkrecht zur Förderrichtung 16.In the in FIG. 1 shown open position of the door leaf 34 projects this and the protective cover 80 through the passage 48 in the furnace housing 12 and the passage 102 in the refractory material 28 a little into the transition region 22 in the furnace tunnel 14 into it. In the transition region 22, a ceiling flap 104 is provided. This can by means of a servo motor, not shown, between an upper position in which it is present in a horizontal plane just below the passage 102 in the refractory material 28 (see. FIG. 1 ) and a folded down position in which it clears the way for the door leaf 34 with the protective cover 80 into the furnace tunnel 14 (see. FIG. 3 ), are pivoted. The axis of rotation of the ceiling flap 104 is arranged in the transition region 22 on the side of the first furnace zone 18 and extends in a horizontal plane perpendicular to the conveying direction 16.

Im Übergangsbereich 22 ist ferner eine zweiflügelige Tür 106 angeordnet. Deren Türklappen 106a, 106b können mittels eines Stellmotors 108 um jeweils eine vertikale Drehachse, die im Übergangsbereich 22 auf der Seite der zweiten Ofenzone 20 angeordnet ist, zwischen einer ersten Stellung und einer zweiten Stellung verschwenkt werden. In der ersten Stellung sind die Türklappen 106a, 106b parallel zur Förderrichtung 16 angeordnet (vgl. Figur 1), wogegen diese in der zweiten Stellung senkrecht zur Förderrichtung 16 angeordnet sind (vgl. Figuren 3 und 4).In the transition region 22, a two-leaf door 106 is further arranged. Their door flaps 106a, 106b can be pivoted by means of a servo motor 108 about a respective vertical axis of rotation, which is arranged in the transition region 22 on the side of the second furnace zone 20, between a first position and a second position. In the first position, the door flaps 106a, 106b are arranged parallel to the conveying direction 16 (cf. FIG. 1 ), whereas in the second Position are arranged perpendicular to the conveying direction 16 (see. Figures 3 and 4 ).

Die Bodenaufnahme 78 ist im Übergangsbereich 22 durch eine zweiflügelige Bodenklappe 110 abdeckbar bzw. freigebbar. Dazu umfasst die Bodenklappe 110 zwei gekrümmte Flügelklappen 112, 114, welche derart angeordnet sind, dass ihre nach außen gekrümmten Oberflächen ins Innere des Ofentunnels 14 weisen. Die Flügelklappen 112 und 114 erstrecken sich längs der Bodenaufnahme 78 zwischen den an jeder Seite des Ofentunnels 14 angeordneten Führungsrippen 68 und 70. Die Flügelklappen 112, 114 liegen in der Abdeckstellung der Bodenklappe 110 mit ihren sich gegenüberliegenden Längsseiten aneinander an, was in Figur 1 zu erkennen ist. Auf der der jeweiligen Anlageseite gegenüberliegenden Längsseite sind an den Flügelklappen 112, 114 nach unten weisende Führungsholme 116 angebracht. Deren von den Flügelklappen 112, 114 abliegendes Ende ist um eine horizontale Drehachse verdrehbar gelagert, die senkrecht zur Förderrichtung 16 verläuft.The bottom receptacle 78 can be covered or released in the transition region 22 by a double-leaf bottom flap 110. For this purpose, the bottom flap 110 comprises two curved wing flaps 112, 114, which are arranged such that their outwardly curved surfaces point into the interior of the furnace tunnel 14. The wing flaps 112 and 114 extend along the bottom receptacle 78 between the guide ribs 68 and 70 disposed on each side of the furnace tunnel 14. The wing flaps 112, 114 abut each other in the covering position of the bottom flap 110 with their opposite longitudinal sides FIG. 1 can be seen. On the longitudinal side opposite the respective contact side, guide rails 116 pointing downwards are attached to the wing flaps 112, 114. Whose end of the wing flaps 112, 114 remote end is rotatably mounted about a horizontal axis of rotation, which is perpendicular to the conveying direction 16.

Mittels eine Stellmotors 118 können die Flügelklappen 112, 114 der Bodenklappe 110 zwischen der in Figur 1 gezeigten Abdeckstellung und der in Figur 3 gezeigten Freigabestellung verschwenkt werden.By means of a servomotor 118, the wing flaps 112, 114 of the bottom flap 110 between the in FIG. 1 shown cover position and the in FIG. 3 shown release position to be pivoted.

Das Torgehäuse 50 weist eine Zwischendecke 120 mit einem Durchlass 122 auf, durch welchen das Torblatt 34 hindurch läuft. Die Zwischendecke 120 ist in einer solchen Höhe angeordnet, dass, wenn das Torblatt 34 seine in Figur 3 gezeigte Schließstellung einnimmt, die längs des oberen Randes 44 des Torblatts 34 verlaufenden Abschnitte der Silikondichtungen 58 und 60 von der jeweils benachbarten Innenmantelfläche des Durchlasses 122 flankiert sind. Dabei ist der Durchlass 122 so bemessen, dass die aufgeblasenen Silikondichtungen 58, 60 gegen die Innenmantelfläche des Durchlasses 122 abdichten.The door housing 50 has an intermediate ceiling 120 with a passage 122 through which the door leaf 34 passes. The false ceiling 120 is arranged at such a height that when the door leaf 34 its in FIG. 3 shown closed position, which are flanked along the upper edge 44 of the door leaf 34 extending portions of the silicone gaskets 58 and 60 of the respective adjacent inner circumferential surface of the passage 122. In this case, the passage 122 is dimensioned such that the inflated silicone seals 58, 60 seal against the inner circumferential surface of the passage 122.

Durch die Zwischendecke 120 ist das Torgehäuse 50 in einen oberen Raum 124 und einen unteren Raum 126 unterteilt. Im unteren Raum 126 befindet sich eine Niederhalteeinrichtung 128 mit zwei mit den Halteplatten 98 der Schutzabdeckung 80 zusammenarbeitenden Druckelementen 130. Die Niederhalteeinrichtung umfasst außerdem eine Positionsabfrageeinheit 132. Die Toreinheit 24 umfasst ferner eine Sensoreinheit 134 zur Erfassung einer Mitnahmestellung des Torblatts 34. Auf die Funktion dieser Komponenten wird weiter unten nochmals eingegangen.Through the false ceiling 120, the door housing 50 is divided into an upper space 124 and a lower space 126. In the lower space 126 there is a holding-down device 128 with two pressure elements 130 cooperating with the holding plates 98 of the protective cover 80. The hold-down device also comprises a position sensing unit 132. The gate unit 24 further comprises a sensor unit 134 for detecting a driving position of the door leaf 34 Components will be discussed again below.

Der obere Raum 124 im Torgehäuse 50 kann über nur schematisch dargestellte Leitungen 136 evakuiert bzw. mit einem gasförmigen Medium beaufschlagt werden. Entsprechende Leitungen 138 führen auch zum unteren Raum 126 im Torgehäuse 50, wobei jeder den Hauptflächen 36 und 38 des Torblatts 34 benachbarte Bereich des unteren Raums 126 separat evakuiert oder geflutet werden kann. Darüber hinaus ist eine Differenzdruckeinrichtung 140 vorgesehen, welche einen Druckunterschied im unteren Raum 126 des Torgehäuses 50 auf der Seite der Hauptfläche 36 des Torblatts 34 und der ersten Ofenzone 18 messen kann. Eine entsprechende Differenzdruck-Messeinrichtung 142 ist vorhanden, um einen Druckunterschied zwischen dem unteren Raum 126 im Torgehäuse 50 auf der Seite der Hauptfläche 38 des Torblatts 34 und der zweiten Ofenzone 20 zu ermitteln.The upper space 124 in the door housing 50 can be evacuated via lines 136 shown only schematically or acted upon by a gaseous medium. Corresponding lines 138 also lead to the lower space 126 in the door housing 50, wherein each of the main surfaces 36 and 38 of the door leaf 34 adjacent portion of the lower space 126 can be evacuated separately or flooded. In addition, a differential pressure device 140 is provided, which can measure a pressure difference in the lower space 126 of the door housing 50 on the side of the main surface 36 of the door leaf 34 and the first furnace zone 18. A corresponding differential pressure measuring device 142 is provided to detect a pressure difference between the lower space 126 in the door housing 50 on the side of the main surface 38 of the door leaf 34 and the second furnace zone 20.

Der oben beschriebene Vakuumofen 10 funktioniert wie folgt:

  • Wie eingangs erwähnt kann der Vakuumofen 10 bei einer Temperatur von bis zu 1800 °C betrieben werden. Bei der in Figur 1 gezeigten Offenstellung des Torblatts 34 ist der Weg im Übergangsbereich 22 zwischen der ersten Ofenzone 18 und der zweiten Ofenzone 20 frei. Zu brennendes Gut kann so mittels der Rollen 26 aus der ersten Ofenzone 18 in die zweite Ofenzone 20 verfahren werden. Die dem Ofentunnel 14 zugewandten Außenflächen der Deckenklappe 104, der zweiflügeligen Tür 106 sowie der Bodenklappe 110 sind der im Ofentunnel 14 erzeugten Wärmestrahlung ausgesetzt und weisen eine entsprechend hohe Temperatur auf. Die Deckenklappe 104 schirmt in ihrer oberen Stellung die von kaltem Wasser durchströmten unteren Abschnitte 94 der Hohlprofile 84 der Schutzabdeckung 80 weitgehend vom heißen Inneren des Ofentunnels 14 ab, so dass ein Wärmeverlust durch die kalten Hohlprofile 84 weitgehend vermieden ist.
The vacuum furnace 10 described above works as follows:
  • As mentioned above, the vacuum furnace 10 can be operated at a temperature of up to 1800 ° C. At the in FIG. 1 shown open position of the door leaf 34, the path in the transition region 22 between the first furnace zone 18 and the second furnace zone 20 is free. To burning good can so by means of the rollers 26 are moved from the first furnace zone 18 into the second furnace zone 20. The furnace tunnel 14 facing the outer surfaces of the ceiling flap 104, the two-leaf door 106 and the bottom flap 110 are exposed to the heat generated in the furnace tunnel 14 and have a correspondingly high temperature. The top flap 104 shields in its upper position, the cold water flowed through lower portions 94 of the hollow sections 84 of the protective cover 80 largely from the hot interior of the furnace tunnel 14, so that heat loss through the cold hollow sections 84 is largely avoided.

Damit die Ofenzonen 18 und 20 mit unterschiedlichen Gasen beaufschlagt werden können, müssen die Ofenzonen 18 und 20 gasdicht voneinander getrennt werden.In order for the furnace zones 18 and 20 to be exposed to different gases, the furnace zones 18 and 20 must be separated from each other in a gastight manner.

Zunächst wird dazu die Deckenklappe 104 mittels des zugehörigen Stellmotors in ihre in Figur 3 gezeigte herabgeklappte Stellung gebracht, wodurch der Durchlass 48 im Ofengehäuse 12 und der Durchlass 102 in dem feuerfesten Material 28 freigegeben sind. Die Türklappen 106a, 106b der zweiflügeligen Tür 106 werden mittels der.Stellmotoren 108 in ihre ebenfalls in Figur 3 gezeigte Stellung verschwenkt, in der sie senkrecht zur Förderrichtung 16 stehen.First, to the ceiling flap 104 by means of the associated servo motor in their in FIG. 3 shown lowered position, whereby the passage 48 in the furnace housing 12 and the passage 102 in the refractory material 28 are released. The door flaps 106a, 106b of the double-leaf door 106 are moved by means of the motors 108 in their also in FIG. 3 shown pivoted position in which they are perpendicular to the conveying direction 16.

Nun wird das Torblatt 34 durch die pneumatische Hubeinrichtung 52 nach unten gefahren. Dabei wird die Schutzabdeckung 80 derart mitgeführt, dass der untere Abschnitt 94 des von Kühlwasser durchströmten Hohlprofils 84 stets auf einer Höhe mit und vor dem Abschnitt der Silikondichtung 58 bzw. 60 angeordnet ist, welcher parallel zum unteren Rand 46 des Torblatts 34 verläuft.Now the door leaf 34 is moved by the pneumatic lifting device 52 down. In this case, the protective cover 80 is entrained in such a way that the lower portion 94 of the hollow profile 84 traversed by cooling water is always arranged at a height with and in front of the portion of the silicone seal 58 or 60, which runs parallel to the lower edge 46 of the door leaf 34.

Die Flügelklappen 112, 114 der Bodenklappe 110 werden mittels des Stellmotors 118 verschwenkt, so dass die Bodenaufnahme 78 im Übergangsbereich 22 des Ofentunnels 14 freigegeben wird.The wing flaps 112, 114 of the bottom flap 110 are pivoted by means of the servomotor 118, so that the bottom receptacle 78 is released in the transition region 22 of the furnace tunnel 14.

Das Torblatt 34 und die Schutzabdeckung 80 fahren so lange gemeinsam in der oben erläuterten Relativposition in den Ofentunnel 14 ein, bis die unteren Abschnitte 94 der Hohlprofile 84 der Schutzabdeckung 80 auf den Bodenrippen 74 bzw. 76 der Bodenaufnahme 78 zu liegen kommen, wodurch die Bewegung der Schutzabdeckung 80 gestoppt wird. Das Torblatt 34 wird jedoch noch ein wenig weiter nach unten gefahren, bis die parallel zum unteren Rand 46 des Torblatts 34 verlaufenden Abschnitte der Silikondichtungen 58 und 60 von den Bodenrippen 74 bzw. 76 der Bodenaufnahme 78 flankiert sind.The door leaf 34 and the protective cover 80 travel together in the above-described relative position in the furnace tunnel 14 until the lower portions 94 of the hollow sections 84 of the protective cover 80 come to lie on the bottom ribs 74 and 76 of the bottom receptacle 78, whereby the movement the protective cover 80 is stopped. However, the door leaf 34 is driven a little further down until the parallel to the lower edge 46 of the door leaf 34 extending portions of the silicone gaskets 58 and 60 are flanked by the bottom ribs 74 and 76 of the bottom receptacle 78.

Wie bereits oben erwähnt, liegen die Abschnitte der Silikondichtungen 58 und 60, welche parallel zu den Seitenrändern 40 und 42 des Torblatts 34 verlaufen, jeweils zwischen den Führungsrippen 68 und 70 der Führungsstruktur 66. Die nach innen versetzten Seitenabschnitte 86 und 90 des Hohlprofils 84 bieten eine Abschirmung gegen die Hitzestrahlung aus dem Ofentunnel 14, wodurch die Temperatur der Silikondichtungen 58 und 60 in ihren vertikalen Abschnitten stets unter der für sie maximalen Höchsttemperatur gehalten wird.As already mentioned above, the portions of the silicone gaskets 58 and 60, which are parallel to the side edges 40 and 42 of the door leaf 34, respectively between the guide ribs 68 and 70 of the guide structure 66. The inwardly offset side portions 86 and 90 of the hollow profile 84 offer a shield against the heat radiation from the furnace tunnel 14, whereby the temperature of the silicone gaskets 58 and 60 in their vertical sections is always kept below the maximum maximum temperature for them.

Der gleiche Effekt wird durch die unteren Abschnitte 94 des Hohlprofils 84 für die horizontalen Abschnitte der Silikondichtungen 58 und 60 beim Durchfahren des Ofentunnels 14 bewirkt.The same effect is caused by the lower portions 94 of the hollow profile 84 for the horizontal portions of the silicone gaskets 58 and 60 when passing through the furnace tunnel 14.

Durch die herabgeklappte Deckenklappe 104 und die geschlossene zweiflügelige Tür 106 werden die Ofenzonen 18 und 20 gegenüber dem wassergekühlten Torblatt 34 sowie der ebenfalls wassergekühlten Schutzabdeckung 80 abgeschirmt, so dass zu brennende Gegenstände, welche dem Übergangsbereich 22 benachbart in den Ofenzonen 18, 20 angeordnet sind, keine oder nur eine geringe Abkühlung erfahren.The folded down ceiling flap 104 and the closed double-leaf door 106 shield the furnace zones 18 and 20 from the water-cooled door leaf 34 as well as the likewise water-cooled protective cover 80 so that objects to be burned which are arranged adjacent to the transition zone 22 in the furnace zones 18, 20 none or experience only a slight cooling.

Diese Abschirmung ist insbesondere aus dem Grund effektiv, da sowohl die Deckenklappe 104 als auch die Türen der zweiflügeligen Tür 106 Brenngut im Innenraum des Ofentunnels 14 stets die gleiche Außenoberfläche zuwenden, unabhängig davon, welche Stellung sie einnehmen. Auf diese Weise werden kalte oder kältere Flächen im Ofentunnel 14 weitgehend vermieden.This shielding is effective, in particular, for the reason that both the ceiling flap 104 and the doors of the double-leaf door 106 always turn to the same outer surface in the interior of the furnace tunnel 14, regardless of which position they occupy. In this way, cold or colder surfaces in the furnace tunnel 14 are largely avoided.

Wenn das Torblatt 34 seine in Figur 3 gezeigte unterste Position einnimmt, in welcher es mit seinem unteren Randabschnitt in die Bodenaufnahme 78 eingefahren ist, werden die Silikondichtungen 58 und 60 aufgeblasen, so dass sie gegen die durch die Bodenrippen 74, 76, die Führungsrippen 78, 70 und die Innenwandflächen der Nuten 72 im Torgehäuse 50 und die betreffenden Innenflächen des Durchlasses 122 der Zwischendecke 120 des Torgehäuses 50 gebildeten Gegenflächen presst.When the door leaf 34 its in FIG. 3 occupies the lowest position in which it has retracted with its lower edge portion in the bottom receptacle 78, the silicone gaskets 58 and 60 are inflated so that they against the bottom ribs 74, 76, the guide ribs 78, 70 and the inner wall surfaces of the grooves 72nd in the door housing 50 and the respective inner surfaces of the passage 122 of the false ceiling 120 of the door housing 50 formed counter surfaces pressed.

Dadurch, dass die Silikondichtungen 58 und 60 so auch den Durchlass 122 in der Zwischendecke 120 des Torgehäuses 50 abdichten, sind dessen oberer Raum 124 und dessen unterer Raum 126 gasdicht voneinander getrennt. Auch sind so die Teilbereiche des unteren Raums 126 des Torgehäuses 50, die jeweils auf der Seite der Hauptfläche 36 bzw. der Hauptfläche 38 des Torblatts 34 liegen, voneinander isoliert.Characterized in that the silicone gaskets 58 and 60 so also seal the passage 122 in the false ceiling 120 of the door housing 50, the upper space 124 and the lower space 126 are gas-tight separated from each other. Also, the portions of the lower space 126 of the door housing 50, which are respectively on the side of the main surface 36 and the main surface 38 of the door leaf 34, isolated from each other.

Beim Herunterfahren des Torblatts 34 wird im Torgehäuse 50 ein Unterdruck erzeugt, wodurch heißes Gas aus dem Ofentunnel 14 durch die Durchlässe 48 und 102 im Ofengehäuse 12 in das Torgehäuse 50 eingezogen werden könnten. Dabei würde jedoch heißes Gas an den Silikondichtungen 58 und 60 vorbeiströmen, was diese zerstören könnte.Upon shutdown of the door leaf 34, a negative pressure is generated in the door housing 50, whereby hot gas could be drawn from the furnace tunnel 14 through the passages 48 and 102 in the oven housing 12 in the door housing 50. However, hot gas would flow past the silicone gaskets 58 and 60, which could destroy them.

Aus diesem Grund sind die Differenzdruck-Messeinrichtungen 140, 142 vorgesehen, welche den im Torgehäuse 50 herrschenden Druck mit dem in der ersten Ofenzone 18 bzw. in der zweiten Ofenzone 20 herrschenden Druck vergleichen. Mittels einer hier nicht eigens gezeigten Steuerung kann durch die Leitungen 136 bzw. 138 ein Druckausgleich erfolgen, so dass im entsprechenden Bereich des Torgehäuses 50 kein geringerer oder höherer Druck herrscht als in den Ofenzonen 18 bzw. 20.For this reason, the differential pressure measuring devices 140, 142 are provided which compare the pressure prevailing in the door housing 50 with the pressure prevailing in the first furnace zone 18 and in the second furnace zone 20, respectively. By means of a control not shown here, a pressure equalization can take place through the lines 136 and 138, so that no lower or higher pressure prevails in the corresponding area of the door housing 50 than in the furnace zones 18 and 20, respectively.

In der unteren Position des Torblatts 34 und der Schutzabdeckung 80 liegt die Abdeckung 100 auf den Wärmeschutzmatten 96 der Schutzabdeckung 80 von außen auf dem feuerfesten Material 28 im Bereich des Durchlasses 48 im Ofengehäuse 12 auf. Dadurch ist eine ergänzende Abschirmung des Torgehäuses 50 gegenüber dem Ofentunnel 14 gebildet.In the lower position of the door leaf 34 and the protective cover 80, the cover 100 rests on the heat protection mats 96 of the protective cover 80 from the outside on the refractory material 28 in the region of the passage 48 in the furnace housing 12. As a result, a supplementary shielding of the door housing 50 with respect to the furnace tunnel 14 is formed.

Wie in Figur 3 zu erkennen ist, sind in der unteren Position des Torblatts 34 und der Schutzabdeckung 80 die Druckelemente 130 der Niederhalteeinrichtung 128 derart angeordnet, dass sie von oben gegen die Halteplatten 98 der Schutzabdeckung 80 drücken, wodurch beide Teilabdeckungen 82 in ihrer unteren Position gehalten werden. Wenn das Torblatt 34 zu gegebener Zeit durch die pneumatische Hubeinrichtung 52 wieder nach oben gezogen wird, bewegt sich die Schutzabdeckung 80 zunächst auf keinen Fall mit.As in FIG. 3 it can be seen, in the lower position of the door leaf 34 and the protective cover 80, the pressure elements 130 of the hold-down 128 are arranged so that they press from above against the retaining plates 98 of the protective cover 80, whereby both partial covers 82 are held in its lower position. When the door leaf 34 is pulled back up in due time by the pneumatic lifting device 52, the protective cover 80 initially does not move with it.

So wird verhindert, dass sich die Schutzabdeckung 80 im Falle beispielsweise einer Verkantung mit dem Torblatt 34 sofort nach oben bewegt. In diesem Fall wären nämlich die unteren Abschnitte 94 der Hohlprofile 84 oberhalb der parallel zum unteren Rand 46 des Torblatts 34 verlaufenden Abschnitte der Silikondichtungen 58 und 60 angeordnet. Dadurch wären die Silikondichtungen 58 und 60 beim Hochfahren des Torblatts 34 der heißen Ofenatmosphäre und der Wärmestrahlung unmittelbar ausgesetzt und würden zerstört werden. Erst nachdem das Torblatt 34 soweit nach oben gefahren ist, dass die entsprechenden Abschnitte der Silikondichtungen 58 und 60 von den unteren Abschnitten 94 der Hohlprofile 84 der Schutzabdeckung 80 flankiert sind, spricht der entsprechend positionierte Sensor 134 zur Ermittlung der Mitnahmestellung des Torblatts 34 an. Aufgrund eines Ausgangssignals desselben wird die Niederhalteeinrichtung 128 derart angesteuert, dass die Druckelemente 130 ihre in Figur 1 gezeigte Position einnehmen und die Halteplatten 98 der Schutzabdeckung 80 freigeben. Im weiteren Verlauf wird die Schutzabdeckung 80 gemeinsam mit dem Torblatt 34 nach oben gefahren, wobei die unteren Abschnitte 94 des Hohlprofils 84 die Silikondichtungen 58 und 60 stets vor der heißen Ofenatmosphäre und dadurch vor der im Ofentunnel 14 erzeugten Wärmestrahlung abschirmen.In this way, the protective cover 80 is prevented from immediately moving upwards in the event of, for example, jamming with the door leaf 34. In this case, namely, the lower portions 94 of the hollow sections 84 above the parallel to the lower edge 46 of the door leaf 34 extending portions of the silicone gaskets 58 and 60 are arranged. As a result, the silicon gaskets 58 and 60 would be directly exposed to the hot furnace atmosphere and the thermal radiation during start-up of the door leaf 34 and would be destroyed. First After the door leaf 34 has moved so far that the corresponding portions of the silicone gaskets 58 and 60 are flanked by the lower portions 94 of the hollow sections 84 of the protective cover 80, the correspondingly positioned sensor 134 is responsive to determining the entrainment position of the door leaf 34. Due to an output signal of the same, the hold-down device 128 is driven such that the pressure elements 130 their in FIG. 1 occupy the position shown and release the retaining plates 98 of the protective cover 80. In the course of the protective cover 80 is driven together with the door leaf 34 upwards, the lower portions 94 of the hollow profile 84, the silicone gaskets 58 and 60 always shield from the hot furnace atmosphere and thereby before the heat generated in the furnace tunnel 14 heat radiation.

Bevor das Torblatt 34 zusammen mit der Schutzabdeckung 80 wieder nach oben in seine Freigabestellung verfahren wird, damit der Weg von der ersten Ofenzone 18 zur zweiten Ofenzone 20 für Brenngut frei wird, wird jedoch zunächst die Gasströmung durch die schlauchförmigen Silikondichtungen 58 und 60 unterbrochen. Die Dichtungen 58, 60 erschlaffen und ragen nicht mehr über die Hauptflächen 36, 38 des Torblatts 34 heraus.Before the door leaf 34 is moved together with the protective cover 80 back up to its release position, so that the way from the first kiln zone 18 to the second kiln zone 20 is free for kiln, but first the gas flow through the tubular silicone seals 58 and 60 is interrupted. The seals 58, 60 become slack and no longer protrude beyond the major surfaces 36, 38 of the door leaf 34.

Wenn das Torblatt 34 in seine Offenstellung verfahren worden ist, wird die Deckenklappe 104 wieder nach oben geklappt, so dass der Durchlass 102 im feuerfesten Material 28 und damit der untere Rand 46 und die kühlen unteren Abschnitte 94 der Hohlprofile 84 gegen die Wärmestrahlung abgeschirmt sind. Auch die Tür 106 zwischen dem Übergangsbereich 22 und der Ofenzone 24 wird wieder geöffnet. Die Türklappen 106a und 106b der Tür 106 schirmen in der in Figur 1 gezeigten Position die Führungsrippen 68 und 70 der Führungsstruktur 66 gegen die heiße Ofenatmosphäre und die im Ofentunnel 14 erzeugte Wärmestrahlung ab. Dies ist notwendig, damit sich die Führungsrippen 68 und 70 nicht aufheizen können, solange das Torblatt 34 seine Offenstellung einnimmt. Ansonsten könnte sich in dem Bereich zwischen den Führungsrippen 68 und 70 eine Temperatur aufbauen, bei welcher die Silikondichtungen 58 und 60 des Torblatts 34 zerstört würden, wenn sie beim Herabfahren des Torblatts 34 wieder in die Führungsrippen 68 und 70 einfahren würden. Aus dem gleichen Grund wird die Bodenklappe 110 geschlossen, damit sie die Bodenaufnahme 78 vor der heißen Ofenatmosphäre und der Wärmestrahlung geschützt.When the door leaf 34 has been moved to its open position, the ceiling flap 104 is folded up again, so that the passage 102 in the refractory material 28 and thus the lower edge 46 and the cool lower portions 94 of the hollow sections 84 are shielded against heat radiation. The door 106 between the transition region 22 and the furnace zone 24 is opened again. The door flaps 106a and 106b of the door 106 shield in the in FIG. 1 shown position the guide ribs 68 and 70 of the guide structure 66 against the hot furnace atmosphere and generated in the furnace tunnel 14 Heat radiation from. This is necessary so that the guide ribs 68 and 70 can not heat up as long as the door leaf 34 assumes its open position. Otherwise, a temperature could build up in the region between the guide ribs 68 and 70 at which the silicone seals 58 and 60 of the door leaf 34 would be destroyed if they would retract into the guide ribs 68 and 70 when the door leaf 34 was lowered. For the same reason, the bottom flap 110 is closed to protect the bottom receptacle 78 from the hot furnace atmosphere and heat radiation.

Durch die Bodenklappe 110 wird zudem über diese hinweg bewegtes Brenngut gegen eine zu starke Abkühlung durch den darunter liegenden kälteren Bereich abgeschirmt, wenn das Brenngut von der ersten Ofenzone 18 in die zweite Ofenzone 20 überführt wird.In addition, the bottom flap 110 shields the firing material moved therefrom from excessive cooling by the colder region below when the firing material is transferred from the first furnace zone 18 into the second furnace zone 20.

Durch die sich mit dem Torblatt 34 mitbewegende Schutzabdeckung 80 können die Silikondichtungen 58 und 60 des Torblatts 34 durch den Ofentunnel 14 hindurch gefahren werden, obwohl die Temperatur darin beträchtlich höher ist, als es die maximale Arbeitstemperatur der Silikondichtungen 58 und 60 eigentlich zulässt. Auf diese Weise kann der Weg zwischen den Ofenzonen 18 und 20 freigegeben werden, ohne dass dazu vorher die Atmosphäre im Ofentunnel 14 abgekühlt werden muss.By moving with the door leaf 34 protective cover 80, the silicone gaskets 58 and 60 of the door leaf 34 can be driven through the furnace tunnel 14, although the temperature therein is considerably higher than the maximum working temperature of the silicone gaskets 58 and 60 actually allows. In this way, the path between the furnace zones 18 and 20 can be released without the atmosphere in the furnace tunnel 14 having to be cooled beforehand.

Bei Ausfall nur einer der beiden aufblasbaren Dichtungen 58, 60 kann der Ofen dennoch weiter betrieben werden. Eine derartige Betriebsstörung führt nicht zwangsläufig zu einem sofortigen Produktionsausfall.In case of failure of only one of the two inflatable seals 58, 60, the oven can still be operated. Such a malfunction does not necessarily lead to an immediate loss of production.

In einer nicht gezeigten Abwandlung kann das Torblatt 34 auch nur auf einer seiner Hauptflächen 36 oder 38 mit einer Dichtung 58 oder 60 versehen und dort entsprechend einer Teilabschirmung 82 vorgesehen sein. In diesem Fall kann die Toreinheit 24 beispielsweise am Eingang oder Ausgang des Vakuumofens 10 verwendet werden.In a modification, not shown, the door leaf 34 can only on one of its major surfaces 36 or 38 with a Seal 58 or 60 provided and provided there corresponding to a partial shield 82. In this case, the gate unit 24 may be used, for example, at the entrance or exit of the vacuum furnace 10.

In einer ebenfalls nicht gezeigten Abwandlung kann anstelle der aufblasbaren Dichtungen 58, 60 auch jeweils eine nicht aufblasbare Dichtung vorgesehen sein. Dazu kann ergänzend eine Andrückvorrichtung in das Torblatt 34 integriert sein, mittels welcher die Dichtung in der Schließstellung des Torblatts 34 an die entsprechenden Gegenflächen der Führungsstruktur 66 gedrückt wird, um eine Dichtwirkung zu erzielen.In a likewise not shown modification, instead of the inflatable seals 58, 60, a non-inflatable seal may also be provided in each case. For this purpose, a pressing device can additionally be integrated into the door leaf 34, by means of which the seal in the closed position of the door leaf 34 is pressed against the corresponding mating surfaces of the guide structure 66 in order to achieve a sealing effect.

Claims (15)

  1. Gate unit for gas-tight separation of two adjacent high temperature zones within a high temperature oven, which comprises:
    a) a gate panel (34) displaceable between an open position and a closed position;
    b) a guide structure (66), within which the gate panel (34) is displaceable along a displacement path;
    c) at least one sealing element (58, 60) which is carried with the gate panel (34),
    characterised in that
    d) protecting means (84) are provided which may be carried with the gate panel (34) over at least one part of the displacement path thereof and by which at least one segment of the sealing element (58, 60) can be protected over at least one part of the displacement path of the gate panel (34) against radiant heat harmful to the sealing element (58, 60).
  2. Gate unit according to Claim 1, characterised in that the protecting means (84) are configured as a cooling structure (84), by which at least one segment of the sealing element (58, 60) may be protected against radiant heat.
  3. Gate unit according to Claim 2, characterised in that the cooling structure (84) is a hollow profile (84) through which a coolant may flow.
  4. Gate unit according to one of Claims 1 to 3, characterised in that the protecting means (84) may be moved relative to the gate panel (34).
  5. Gate unit according to one of Claims 1 to 4, characterised in that at least one segment of the sealing element (58, 60) may be released from the protecting means (84) in the closed position of the gate panel (34).
  6. Gate unit according to one of Claims 1 to 5, characterised in that the gate panel (34) has a first main surface (36) and a second main surface (38) extending parallel thereto, a peripheral groove (54, 56) being incorporated in at least the edge region of at least one main surface (36, 38), and in which a sealing ring (58, 60) is arranged.
  7. Gate unit according to Claim 6, characterised in that the sealing ring (58, 60) is tubular and inflatable and deflatable.
  8. Gate unit according to one of Claims 1 to 7, characterised in that the sealing element (58, 60) cooperates with opposing surfaces formed by the guide structure (66).
  9. Gate unit according to one of Claims 1 to 8, characterised in that the guide structure (66) comprises a receiver (78) extending perpendicular to the direction of displacement of the gate panel (34), by which the gate panel (34) is received with at least one segment of the sealing element (58, 60) when it adopts its closed position.
  10. Gate unit according to one of Claims 1 to 9, characterised in that it is designed so that the protecting means (84) in the closed position of the gate panel (34) are arranged closer to the atmosphere to be protected than the segment of the sealing element (58, 60) to be protected.
  11. High temperature oven having
    a) an oven tunnel (14) comprising a first high temperature zone (18) and a second high temperature zone (20);
    b) a gate unit (24) disposed in a transition region (22) between the first and the second high temperature zones (18, 20), by which the high temperature zones (18, 20) are able to be separated from one another in a gas-tight manner,
    characterised in that
    c) the gate unit (24) according to one of Claims 1 to 10 is provided as a gate unit (24).
  12. High temperature oven according to Claim 11, characterised in that guide structure-protecting means (106, 110) are provided, which protect segments (68, 70, 78) of the guide structure (66) extending in the region of the oven tunnel (14) against the atmosphere in the oven tunnel (14) when the gate panel (34) adopts its open position, and/or gate panel-protecting means (104) are provided, which protect the gate panel (34) against the atmosphere in the oven tunnel (14) when the gate panel (34) adopts its open position.
  13. High temperature oven according to Claim 12, characterised in that the guide structure-protecting means (106, 110) and/or the gate panel-protecting means (104) comprise pivotable protecting flaps (104; 106a, 106b; 112, 114).
  14. High temperature oven according to Claim 13, characterised in that protecting flaps (106a, 106b; 104) of the guide structure-protecting means (106) and/or the gate panel-protecting means (104) adopt a position in which they protect the gate panel (34) against the atmospheres prevailing in the oven zones (18, 20) when the gate panel (34) adopts its closed position.
  15. High temperature oven according to one of Claims 12 to 14, characterised in that the guide structure-protecting means (106, 110) comprise at least one device with two flaps (106a, 106b; 112, 114), which in each case may be pivoted about a rotational axis which extends parallel to segments (68, 70; 78) of the guide structure (66) to be protected by the flaps (106a, 106b; 112, 114).
EP09714185A 2008-02-28 2009-01-30 Gate unit and high temperature oven having the same Not-in-force EP2245405B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL09714185T PL2245405T3 (en) 2008-02-28 2009-01-30 Gate unit and high temperature oven having the same

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008011749A DE102008011749B4 (en) 2008-02-28 2008-02-28 Gate unit and high-temperature furnace with such
PCT/EP2009/000602 WO2009106199A1 (en) 2008-02-28 2009-01-30 Gate unit and high temperature oven having the same

Publications (2)

Publication Number Publication Date
EP2245405A1 EP2245405A1 (en) 2010-11-03
EP2245405B1 true EP2245405B1 (en) 2011-11-09

Family

ID=40527890

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09714185A Not-in-force EP2245405B1 (en) 2008-02-28 2009-01-30 Gate unit and high temperature oven having the same

Country Status (10)

Country Link
US (1) US9605903B2 (en)
EP (1) EP2245405B1 (en)
JP (1) JP5727232B2 (en)
AT (1) ATE533021T1 (en)
DE (1) DE102008011749B4 (en)
DK (1) DK2245405T3 (en)
ES (1) ES2375921T3 (en)
PL (1) PL2245405T3 (en)
PT (1) PT2245405E (en)
WO (1) WO2009106199A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130101163A1 (en) * 2011-09-30 2013-04-25 Rajarshi Gupta Method and/or apparatus for location context identifier disambiguation
CN205980793U (en) * 2016-08-12 2017-02-22 深圳市捷佳伟创新能源装备股份有限公司 Low pressure diffusion furnace furnace gate sealing device
KR20230012108A (en) * 2021-07-14 2023-01-26 삼성디스플레이 주식회사 Glass plate strengthening device and glass plate strengthening method using the same

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2804855A (en) * 1952-02-23 1957-09-03 Surface Combustion Corp Furnace door construction
US3155080A (en) * 1961-10-02 1964-11-03 Reliance Steel Prod Co Forced circulation water-cooled door
US3399875A (en) * 1966-04-21 1968-09-03 Alco Standard Corp Heat treating furnace
US3410547A (en) * 1966-09-22 1968-11-12 Alco Standard Corp Door assembly for heat treating furnaces
US3558112A (en) * 1969-07-07 1971-01-26 Alco Standard Corp Door unit for heat treating apparatus
DE3343299C2 (en) * 1983-11-30 1985-12-12 Hermann Rappold & Co GmbH, 5160 Düren Gate valve for pipelines of large nominal sizes, especially hot blast lines
JPH0322708Y2 (en) * 1986-04-11 1991-05-17
JPH0618234Y2 (en) * 1986-08-01 1994-05-11 石川島播磨重工業株式会社 Sintering furnace
DE3714014A1 (en) 1987-04-27 1988-11-17 Werner Strohmenger Tunnel kiln and method for operating a tunnel kiln
JP2749143B2 (en) * 1989-09-14 1998-05-13 日本真空技術株式会社 Door device for vacuum heat treatment furnace
JP3309416B2 (en) * 1992-02-13 2002-07-29 松下電器産業株式会社 Connected clean space device
US5540109A (en) * 1992-11-05 1996-07-30 Qualmark Corporation Apparatus and method for thermal and vibrational stress screening
US5524020A (en) * 1994-08-23 1996-06-04 Grier-Jhawar-Mercer, Inc. Vacuum furnace with movable hot zone
JP2004330244A (en) * 2003-05-07 2004-11-25 Daido Steel Co Ltd Casting valve for vacuum melting-vacuum casting facility
DE602004025983D1 (en) * 2004-03-18 2010-04-22 Ihi Corp DOUBLE CHAMBER HEAT TREATMENT FURNACE
JP5373603B2 (en) * 2006-06-20 2013-12-18 エプコ（カナダ）リミテッド Metallurgical furnace slag door sealing device
SE529925C2 (en) * 2007-03-14 2008-01-08 Aga Ab Seal for vertically opening door for industrial oven, comprises grooved tubes for engaging with vertical side edges of door and defining channels for liquid coolant

Also Published As

Publication number Publication date
DK2245405T3 (en) 2012-02-20
JP5727232B2 (en) 2015-06-03
ATE533021T1 (en) 2011-11-15
PT2245405E (en) 2012-01-09
DE102008011749A1 (en) 2009-10-15
US9605903B2 (en) 2017-03-28
WO2009106199A1 (en) 2009-09-03
PL2245405T3 (en) 2012-03-30
US20110008743A1 (en) 2011-01-13
ES2375921T3 (en) 2012-03-07
JP2011514960A (en) 2011-05-12
DE102008011749B4 (en) 2010-06-17
EP2245405A1 (en) 2010-11-03

Similar Documents

Publication Publication Date Title
EP0422353A2 (en) Furnace for the partial thermic treatment of tools
EP0721491B1 (en) Device for conveying refuse into a pyrolysis reactor
EP2245405B1 (en) Gate unit and high temperature oven having the same
DE102007058473B4 (en) Method and device for closing a coke oven, which is loaded by a horizontally directed, front and rear oven opening or prepared for coking
DE3342572C2 (en)
EP2217681A1 (en) Device for expelling the contents of coke chamber ovens having a low degree of heat exchange
DE112011100719B4 (en) Lateral transfer system
EP2947410A1 (en) Industrial furnace and method for operating the same
DE3014574C2 (en) Discharge device for coke drying chambers
EP0703289B1 (en) Process and apparatus for removing charging gases, produced during the charging of a coke oven battery with coal
WO2018206383A1 (en) Conveying a material to be conveyed
EP0094928B1 (en) Discharging device for a shaft furnace
DE69510143T2 (en) Vacuum furnace with a movable heating zone
DE102013110943A1 (en) Shrinking device and method of operating a shrinking device
WO2021009171A1 (en) Conveying a material to be conveyed
EP0058320A2 (en) Process for the coking of coal and coke oven for carrying out the process
DE653478C (en) Smoldering furnace for coal
WO2020058195A1 (en) System and method for sintering components
DE4427180A1 (en) Method of sealing carbonisation chamber for soft coking or pyrolysis
WO1999032669A1 (en) Converter installation having a divided sealing ring fitted between the converter and the flue gas chimney
DE937128C (en) Suction sintering process and device for its implementation
DE2657882A1 (en) Multiple loop cooling system for gas-cooled reactors - has individual primary loop flap valves with diametrically-opposed flaps protected by heat shield
DE3314791C2 (en)
EP3399263A1 (en) Oven
DE2726199A1 (en) Tunnel kiln for baking ceramic prods. - which are stacked on refractory tiles travelling on rollers through kiln

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

17P Request for examination filed

Effective date: 20100806

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA RS

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: EISENMANN AG

REG Reference to a national code

Ref country code: DE

Ref legal event code: R079

Ref document number: 502009001889

Country of ref document: DE

Free format text: PREVIOUS MAIN CLASS: F27D0023000000

Ipc: F27D0099000000

RIC1 Information provided on ipc code assigned before grant

Ipc: F27D 99/00 20100101AFI20110222BHEP

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

DAX Request for extension of the european patent (deleted)
GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: GERMAN

REG Reference to a national code

Ref country code: CH

Ref legal event code: NV

Representative=s name: FREI PATENTANWALTSBUERO AG

REG Reference to a national code

Ref country code: PT

Ref legal event code: SC4A

Free format text: AVAILABILITY OF NATIONAL TRANSLATION

Effective date: 20111221

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 502009001889

Country of ref document: DE

Effective date: 20120119

REG Reference to a national code

Ref country code: SE

Ref legal event code: TRGR

REG Reference to a national code

Ref country code: NL

Ref legal event code: T3

REG Reference to a national code

Ref country code: DK

Ref legal event code: T3

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2375921

Country of ref document: ES

Kind code of ref document: T3

Effective date: 20120307

REG Reference to a national code

Ref country code: PL

Ref legal event code: T3

REG Reference to a national code

Ref country code: NO

Ref legal event code: T2

Effective date: 20111109

LTIE Lt: invalidation of european patent or patent extension

Effective date: 20111109

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20111109

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20120309

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20111109

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20111109

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20120210

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20111109

REG Reference to a national code

Ref country code: IE

Ref legal event code: FD4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20111109

REG Reference to a national code

Ref country code: HU

Ref legal event code: AG4A

Ref document number: E013163

Country of ref document: HU

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20111109

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20120209

Ref country code: IE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20111109

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20111109

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20111109

Ref country code: MC

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120131

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

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

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20120810

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 502009001889

Country of ref document: DE

Effective date: 20120810

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20111109

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20111109

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20111109

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120130

REG Reference to a national code

Ref country code: DE

Ref legal event code: R082

Ref document number: 502009001889

Country of ref document: DE

Representative=s name: OSTERTAG & PARTNER, PATENTANWAELTE MBB, DE

Ref country code: DE

Ref legal event code: R081

Ref document number: 502009001889

Country of ref document: DE

Owner name: EISENMANN SE, DE

Free format text: FORMER OWNER: EISENMANN AG, 71032 BOEBLINGEN, DE

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 8

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 9

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: PL

Payment date: 20171219

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20180119

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 20180119

Year of fee payment: 10

Ref country code: CZ

Payment date: 20180129

Year of fee payment: 10

Ref country code: GB

Payment date: 20180119

Year of fee payment: 10

Ref country code: NO

Payment date: 20180130

Year of fee payment: 10

Ref country code: ES

Payment date: 20180227

Year of fee payment: 10

Ref country code: DK

Payment date: 20180119

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20180119

Year of fee payment: 10

Ref country code: HU

Payment date: 20180116

Year of fee payment: 10

Ref country code: BE

Payment date: 20180119

Year of fee payment: 10

REG Reference to a national code

Ref country code: CH

Ref legal event code: PCAR

Free format text: NEW ADDRESS: POSTFACH, 8032 ZUERICH (CH)

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20190124

Year of fee payment: 11

Ref country code: DE

Payment date: 20190123

Year of fee payment: 11

Ref country code: IT

Payment date: 20190124

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: TR

Payment date: 20190117

Year of fee payment: 11

Ref country code: AT

Payment date: 20190122

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: PT

Payment date: 20190129

Year of fee payment: 11

REG Reference to a national code

Ref country code: DK

Ref legal event code: EBP

Effective date: 20190131

Ref country code: NO

Ref legal event code: MMEP

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: NL

Ref legal event code: MM

Effective date: 20190201

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20190130

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20190131

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CZ

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20190130

Ref country code: NO

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20190131

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20190131

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20190201

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20190131

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20190131

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20190130

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20190131

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20190131

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DK

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20190131

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20200310

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20190131

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 502009001889

Country of ref document: DE

REG Reference to a national code

Ref country code: AT

Ref legal event code: MM01

Ref document number: 533021

Country of ref document: AT

Kind code of ref document: T

Effective date: 20200130

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200801

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200131

Ref country code: PT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200901

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200130

Ref country code: PL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20190130

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200130

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200130