Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
  • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
  • B21B1/466—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a non-continuous process, i.e. the cast being cut before rolling
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
  • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
  • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
  • C21D8/0221—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
  • C21D8/0226—Hot rolling
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
  • B21B1/02—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
  • B21B1/04—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing in a continuous process
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
  • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
  • C21D1/34—Methods of heating
  • C21D1/42—Induction heating
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
  • B21B1/02—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
  • B21B2001/028—Slabs
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
  • B21B15/0007—Cutting or shearing the product
  • B21B2015/0014—Cutting or shearing the product transversely to the rolling direction
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B2261/00—Product parameters
  • B21B2261/02—Transverse dimensions
  • B21B2261/04—Thickness, gauge
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B2261/00—Product parameters
  • B21B2261/02—Transverse dimensions
  • B21B2261/06—Width
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B2261/00—Product parameters
  • B21B2261/20—Temperature
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
  • B21B39/004—Transverse moving
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
  • B21B45/004—Heating the product

Definitions

• the present invention relates to a plant and a method for producing flat rolled products from thick-cast steel and/or non-ferrous metal slabs, and in a further aspect to the use of at least one electric heating device arranged in the transport direction upstream of a hot rolling mill, in particular an electric heating device for direct hot insertion, for heating thick slabs with a thickness of at least 160 mm to a hot rolling temperature.
• the prior art includes systems and processes in which thick slabs are heated directly using the casting heat, or only after intermediate storage in a slab storage facility, first by means of gas-operated heating devices and then fed to a hot rolling mill, see e.g. EP 06 10 028 A2 .
• Heating thick slabs in a gas-fired heating system requires, firstly, large quantities of fuel, especially when the slabs, coming from a slab storage area, need to be heated from near-room temperatures to at least 1000 °C, and secondly, long heating times. Furthermore, the use of fossil fuels, particularly natural gas, results in high CO2 emissions.
• the present invention is based on the objective of providing an improved plant and a process for producing a flat rolled product from thick-cast steel and/or non-ferrous metal slabs, compared to the prior art.
• the problem is solved by a system with the features of claim 1 and by a method with the features of claim 12.
• the inventive plant for the production of flat rolled products from thick-cast steel and/or non-ferrous metal slabs comprises a continuous casting device by means of which a continuous material with a thickness of at least 160 mm can be cast continuously; a separating device arranged downstream of the continuous casting device by means of which the flat continuous material can be separated into individual thick slabs; a hot rolling mill in which the thick slabs can be rolled into the flat rolled product, wherein the hot rolling mill comprises a roughing mill and a finishing mill, each with at least one rolling stand, and is arranged in a common (first) conveying line with the at least one continuous casting device; at least one thick slab feeding device arranged transversely to the conveying line and positioned between the separating device and the rolling mill; as well as at least one electric heating device arranged in the direction of transport in front of the pre-rolling mill, for direct hot use, via which at least those thick slabs can be heated over their entire surface to a hot rolling temperature which come from the continuous casting device arranged in a common transport line.
• the thick slabs can be heated to the specified rolling temperature as required.
• the at least one [heating element] is located in the transport direction upstream of the hot rolling mill, in particular in the transport direction before [the hot rolling mill].
• the electric heating device for direct hot insertion, arranged in the pre-rolling mill, thus enables individual temperature control depending on the grade of steel being cast.
• the term "thick slab” means a slab having a minimum thickness of at least 160 mm, preferably a minimum thickness of at least 180 mm, and more preferably a minimum thickness of at least 200 mm. Since the maximum thickness of thick slabs is technologically limited by currently available continuous casting equipment, the maximum thickness is preferably 300 mm, and more preferably 250 mm. Such thick slabs typically have widths in the range of 800 to 2500 mm, and more preferably widths in the range of 1000 to 2300 mm.
• Producing thick slabs compared to thin slabs offers several advantages. Firstly, the throughput alone increases the output, allowing for higher utilization of the hot rolling mill. Thick slabs also offer a significant quality advantage over thin slabs. Compared to thin slabs, thick slabs have a smaller surface area per ton of material cast. This reduces temperature variations in slabs transported on the line. The smaller surface area per ton of material cast also reduces scale formation, resulting in fewer casting residues and surface defects, thus minimizing material losses due to their removal.
• the heating device can advantageously comprise inductive heating devices, conductive heating devices, and/or electric heating devices with indirect resistance heating. It is particularly preferred that the electric heating device be an inductive or a conductive heating device. Due to the thickness range of the thick slabs, an inductive heating device is advantageously operable according to the longitudinal field principle and, due to its high energy density, enables rapid heating. In a conductive heating device, the respective thick slab forms part of the circuit and is thus heated directly by the electric current passed through it, thereby enabling a very high efficiency (close to 1) and particularly rapid heating.
• An inductive and/or conductive electric heating device also has the advantage that it can be designed from a series connection of individual units for both the core and the near-surface areas of the thick slabs.
• an electric tunnel furnace operated via resistance heating can also be provided.
• the system according to the invention allows a temperature profile to be set in the respective thick slab, which is specifically tailored to the subsequent pre-rolling process, in particular the cooling that occurs during pre-rolling. If cold spots (so-called "skid marks”) are detected on the thick slab surface, which occur, for example, when using walking beam furnaces, these can be specifically eliminated by targeted heating, thereby improving the quality of the subsequently produced flat-rolled product.
• the short heating times also reduce scale formation, which improves both the output quantity and the surface quality.
• the system according to the invention enables each thick slab to be individually heated to the technologically required temperature level without overheating or undercooling.
• full surface means that the thick slabs are heated to a predetermined nominal temperature over their entire surface and at a specific thickness when passing through the electric heating device.
• the nominal temperature of the thick slab is largely uniform and/or identical in three dimensions, whereby permissible temperature differences can be ⁇ ⁇ 80 °C, preferably ⁇ ⁇ 50 °C, particularly preferably ⁇ ⁇ 20 °C of a target/nominal temperature.
• the nominal temperature simplifies further processing of the thick slab.
• Unevenly heated thick slabs can lead to varying forming conditions during further processing, such as rolling. This can result in inconsistent forming across the length and/or width of the slab, increasing the scrap content during necessary finishing cuts. Uneven temperatures can also cause inconsistent microstructural changes and geometric defects, such as flatness errors. By establishing a uniform temperature level across the entire surface early on, these problems and defects are avoided or at least mitigated. Complex setups and processes to compensate for these defects can be simplified or even eliminated. Interference between desired effects and reactions resulting from an uneven temperature level is also minimized.
• the electric heating device for direct hot application is designed such that the thick slabs can be heated across their entire surface.
• a heating device enables not only specific heating of the edges, but also heating of the area between the edges. the central section of the thick slab.
• a further advantage of such an electric heating device for direct hot insertion, arranged in the transport direction upstream of the hot rolling mill, particularly upstream of the roughing mill, is that it enables maximum utilization of the casting heat, thus allowing energy savings of more than 70% compared to conventional removal from a slab storage area.
• the present plant according to the invention is suitable and intended solely for the production of flat rolled products from thick-cast steel and/or non-ferrous metal slabs.
• the thick slabs produced can be easily temporarily stored or transported from a second conveyor line due to their typical dimensions, unlike plants designed for the production of thin slabs.
• Thick slabs are usually less than 12 meters long, sometimes less than 10 meters, whereas thin slabs typically have lengths of at least 25 meters and are therefore more complex to transport and store.
• the flat rolled products from such plants also differ from those produced by plants designed for the production of thin slabs. For example, specific steel grades, such as peritectic steel grades or steel grades with very high surface quality requirements, cannot be produced to the required quality on conventional thin slab mills.
• the length of a given thick slab can correspond not only to a single coil length but also to a multiple thereof, since transport across the transport line and further handling steps are eliminated.
• the continuous casting device is designed such that a continuous material with a thickness of at least 160 mm can be cast using it.
• the continuous casting device can, for example, be designed as a single-strand or a multi-strand continuous casting device.
• the system can include at least one electric pre-heating unit arranged upstream of the finishing mill in the transport direction.
• This unit is particularly preferably designed to heat the rolled flat-rolled semi-finished product across its entire surface.
• This allows the rolled flat-rolled semi-finished products, which leave the pre-rolling mill at a temperature below 1000 °C, for example, to be heated with exceptional energy efficiency to a temperature specifically predetermined for the finishing rolling process.
• This enables the desired properties of the flat-rolled product to be adjusted. For instance, temperature differences between the head and the end of a rolled flat-rolled semi-finished product can be effectively compensated, resulting in greater rolling stability and thus higher output.
• the resulting more homogeneous temperature distribution also allows for thinner end strips and more homogeneous mechanical properties of the produced flat-rolled product.
• the at least one thick slab feeding device is preferably designed as a transport and heating device, via which transported and/or temporarily stored thick slabs are heated, if necessary over their entire surface, to the hot rolling temperature. are heatable.
• the transport and heating device can be designed to allow for temperature increases and/or temperature maintenance simultaneously or sequentially with transport.
• the thick slab feeding device is designed in the form of a walking beam furnace, which includes at least one segment comprising electrically operated heating elements and/or gas-powered burners.
• a plant designed in this way comprises a first transport line, via which the thick slabs can be briefly heated to hot rolling temperature using the electric heating device for direct hot insertion, utilizing the casting heat, and then fed into the hot rolling mill.
• a second transport line can also be provided, via which intermediately stored and/or cooled thick slabs (usually stored in a slab storage area and/or a holding pit) are heated directly to hot rolling temperature via the thick slab feeding device and then fed into the rolling process.
• thick slabs cast in a second continuous casting unit can also be fed into the rolling process via the thick slab feeding device.
• At least one, preferably two or a plurality of the thick slab feeding devices are arranged between the electric heating device for direct hot insertion and the roughing mill.
• the system can also include at least one, preferably two or a plurality of the thick slab feeding devices between the cutting device and the electric heating device for direct hot insertion.
• At least one electric thick slab preheating device can be installed upstream on the inlet side, which is particularly preferably designed such that the thick slabs can be heated across their entire surface.
• An electric thick slab preheating unit is particularly suitable when higher temperatures are required at short notice to adjust the mechanical properties, such as strength, of the flat rolled products to be produced, and the subsequent thick slab feeding unit can be operated at a lower temperature level required for the flat rolled products to be produced.
• At least one electric slab reheating unit can be connected downstream of the at least one thick slab feeding device. This unit is particularly preferably designed to allow the thick slabs to be heated across their entire surface. It is especially preferred that the at least one electric slab reheating unit is arranged between the at least one thick slab feeding device and the roughing mill.
• the outlet-side electric slab reheating unit further increases the flexibility of the plant, enabling both energy-efficient production and optimal fulfillment of the logistical and technological requirements of the rolling mill.
• the system can include at least one supplementary electric thick slab heating device, which is preferably connected upstream of at least one electric thick slab reheating device.
• the rolling mill should allow for specific rolling program profiles. This is because using the same slab widths reduces availability in the hot rolling mill due to an increase in the number of necessary work roll changes. Therefore, the roughing mill advantageously includes, in the transport direction...
• the upsetting unit comprises at least one slab upsetting press and/or, optionally, at least one, preferably multiple, upsetting units.
• an upsetting unit such as the slab upsetting press, optionally in combination with at least one upsetting unit, ensures a necessary width- and profile-optimized rolling program, as larger and/or constant slab widths can be cast.
• the upsetting unit is designed to allow a reduction in slab width of up to 450 mm, preferably up to 350 mm.
• additional upsetting units enables a further reduction in slab width of up to 100 mm per upsetting unit.
• the system can include a control unit with an associated calculation unit, wherein the control unit is designed to control and/or regulate the system on the basis of minimized energy consumption and/or maximum throughput, and/or on the basis of product characteristics and/or product dimensions.
• the calculation unit can preferably use a physical process model that represents the thermal conditions and generates suggestions for system settings.
• the control unit can control the system in such a way as to achieve maximum throughput. This can be achieved by optimizing groups of batches with specific thickness, width, and/or length dimensions.
• the casting sequences, the insertion sequences, the transport system, and/or the operation of the rolling mill at its design limits can be used to increase throughput.
• maintenance cycles such as roll changeover times, mold changeover times, and/or mold conversion times can be taken into account.
• Grouping batches and/or sequences according to product dimensions has the advantage of minimizing material losses due to transition pieces when width or thickness changes occur.
• the system can also be controlled according to product properties by the control unit. For example, if a very high surface quality is required, the control unit can adjust the casting speed accordingly, the descaling process, the temperature, etc. Similarly, the system settings can be optimized to achieve optimal magnetic, mechanical, and/or geometric properties.
• the system can include a plurality of thermal insulation hoods between the separating device and the electric heating device for direct hot insertion, and possibly between the electric heating device for direct hot insertion and the hot rolling mill, in particular the roughing mill.
• system can also include a multiple thermal insulation hoods within the pre-rolling line.
• the thick slabs are fed to the first electric heating device for direct hot insertion at a temperature of at least 500 °C.
• the pre-rolled flat product is heated to a temperature of at least 950 °C by means of an electric pre-strip heating device before it is finished-rolled into the flat product.
• the present invention also relates to the use of at least one electric heating device arranged in the transport direction upstream of a hot rolling mill for direct hot insertion, in particular an inductive heating device, for heating thick slabs with a thickness of at least 160 mm to a hot rolling temperature.
• plant 1 has a roller conveyor 6 in the first transport line T, which extends through plant 1.
• the roller conveyor 6 can be covered segmentally with a plurality of active or passive thermal insulation hoods 22, of which two are shown purely as examples in the present embodiment. This allows the energy and temperature losses of the thick slabs on the transport route to the hot rolling mill 5 to be kept as low as possible.
• the thick slabs typically cool to an average temperature of 800 to 900 °C during transport to the hot rolling mill 5. Therefore, according to the invention, the thick slabs are heated to a hot rolling temperature of 1100 to 1300 °C in the transport direction before entering the hot rolling mill 5 by means of an electric heating device 7 for direct hot insertion.
• the electric heating device 7 is designed as a longitudinal field inductor and thus enables the short-term heating of the cooled thick slab to the specific hot rolling temperature.
• the depicted embodiment includes a control unit S, which incorporates a calculation unit B.
• This unit can determine the operating settings that minimize energy consumption.
• the control unit S is connected to the system 1 via a signal connection and makes the necessary adjustments to the system 1 for the production of the thick slab.
• the operating settings can be optimized according to... maximum throughput, and/or product characteristics and/or product dimensions.
• FIG 2 Another embodiment of the inventive system 1 is shown.
• system 1 located between a roughing mill 8 and a finishing mill 9 of the hot rolling mill 5, additionally includes an electric pre-strip heating unit 10.
• the electric pre-strip heating unit 10 is also designed as a longitudinal field inductor or inductor combination, such that the pre-rolled flat products can be heated across their entire surface.
• the electric pre-strip heating unit 10 the pre-rolled flat products, which leave the roughing mill 8 at a temperature below 1100 °C, are heated with particular energy efficiency to a temperature of 950 to 1100 °C specifically specified for the finishing rolling process.
• FIG. 3 shows a further embodiment of the system according to the invention.
• plant 1 comprises a second transport line T2 arranged parallel to the first transport line T1, comprising a second roller conveyor 6.2, a second continuous casting unit 11, which is also configured to continuously cast a continuous material with a thickness in the range of 200 to 250 mm, and a second cutting unit 12.
• the second cutting unit 12 can also be designed in the form of a pendulum shear or a continuous material burning unit.
• the second roller conveyor 6.2 can also be covered segmentally with a plurality of active or passive thermal insulation hoods 22, as can be seen from the different
• the thick slabs produced in this line can be temporarily stored and cooled in a slab storage area 13 located directly downstream of the second cutting unit 12.
• the individual thick slabs can be temporarily stored in a holding pit 14 with lower temperature losses.
• Annex 1 also includes a thick slab feeding device 15, which is designed as a gas-powered transport and heating device.
• the thick slab feeding device 15 is arranged between the electric heating device for direct hot insertion 7 and the pre-rolling mill 8, and transversely to the transport direction.
• the system 1 comprises two electric thick slab preheating devices 16.1, 16.2, which are connected upstream of the thick slab feeding device 15 on the inlet side.
• the two preheating devices 16.1, 16.2 are also designed as longitudinal field inductors or inductor combinations, such that the thick slabs can be heated across their entire surface.
• system 1 comprises a sequence of two electric heating devices 7, 17, arranged in the transport direction between the slab storage 13 and the pre-rolling road 8.
• a series of three electric heating devices 7, 17, 18 are arranged between the slab storage area 13 and the pre-rolling road 8.
• the [system] comprises Figure 5
• the illustrated embodiment includes the electric heating devices 16.1, 16.2 arranged in the second transport line T2. This large number of heating devices 7, 16.1, 16.2, 17, 18 makes it possible to design and operate them in a particularly individual and performance-related manner, without power losses or over-dimensioning.
• All heating devices 7, 10, 16.1, 16.2, 17, 18 of the exemplary embodiments are shown only schematically and typically comprise a number of individual inductors that can be sequentially cycled through. Individual switching on and off, as well as individual power settings, are not possible. This allows for very precise adjustment of the desired or necessary temperature rise.
• inductors designed exclusively as longitudinal field inductors combination sequences of longitudinal and transverse field inductors are also available, which can be traversed sequentially.
• additional thick slabs can be introduced into the first transport line T1 by means of a thick slab feeding device 15, at a position located upstream or downstream of the heating device for direct hot insertion 7.
• the fully or partially cooled thick slabs can be introduced from a slab storage area 13 into the thick slab feeding device 15 and simultaneously heated to a hot rolling temperature and transported.
• Additional thick slabs can also be fed into the first transport line T1 via the thick slab feeding device 15, at a position located upstream of the heating device for direct hot insertion 7.
• the fully or partially cooled thick slabs can be fed into the thick slab feeding device 15 from a slab storage area 13 or, alternatively, from a holding pit 14, and simultaneously heated to a hot rolling temperature and transported.
• the arrangement and number of the thick slab feeding devices 15 can be varied as desired.
• the thick slab feeding device 15 can be an electrically and/or gas-operated continuous furnace and/or walking beam furnace.
• a heating device belonging to the thick slab feeding device 15 can preheat the thick slab to a slightly elevated temperature; the transport itself then takes place without active heat input via a preferably insulated transport walkway or walking beam.
• the thick slabs temporarily stored and cooled in the slab storage area 13 or those in the holding pit can be transferred via the thick slab feeding device 15.
• 14 thick slabs, which have been temporarily stored at 200 to 800 °C and slightly cooled, are heated to a hot rolling temperature before being fed into the rolling process via the first roller stage 6.1.
• a variant embodiment of a pre-rolling mill 8 which comprises a compression device 19 in the transport direction, as well as at least one first and preferably one second pre-rolling stand 20, 21, each of which has a horizontal and preferably a vertical stand.
• a series of thermal insulation hoods 22 are provided.

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• 2022
  • 2022-09-29 EP EP22799874.7A patent/EP4408595B1/de active Active
  • 2022-09-29 WO PCT/EP2022/077112 patent/WO2023052500A1/de not_active Ceased
  • 2022-09-29 US US18/695,875 patent/US20250129444A1/en active Pending
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