Classifications

• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
  • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
  • C23C2/003—Apparatus
  • C23C2/0034—Details related to elements immersed in bath
  • C23C2/00342—Moving elements, e.g. pumps or mixers
  • C23C2/00344—Means for moving substrates, e.g. immersed rollers or immersed bearings
• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
  • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
  • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
  • C23C2/36—Elongated material
  • C23C2/40—Plates; Strips

Definitions

• the invention relates to a hot dip coating apparatus for a metal band and a sealing system for such and a method for operating a hot dip coating apparatus.
• a hot-dip coating device is known, for example, from DE 10 2004 030 207 A1.
• the device disclosed therein comprises a container for the molten metal, through which the metal strip is passed.
• the metal strip When passing through the melt, the metal strip is deflected in the melt by means of a roller, which has a roller body and a roller journal, and stabilized.
• the roller or the roller journal is roller-mounted.
• the rolling bearings must be protected from the aggressive molten metal.
• the shaft passage to the molten metal must be closed by a seal to prevent the penetration of the melt into the rolling bearing.
• the seal is effected with the aid of a lock, which surrounds the roller journal with a lock chamber, which - apart from a leak at the shaft passage, that is to say at the transition to the shaft journal - is sealed or sealed against the molten metal.
• the lock chamber is subjected to a gaseous medium with a gas pressure.
• the lock has a collecting container for collecting leakage losses in the form of smaller amounts of molten metal, which have penetrated despite the gas pressure in the lock chamber. This collecting container must be emptied from time to time, for which purpose it must first be disassembled and later reassembled, so that an increased maintenance effort is associated with the operation of this lock.
• FIG. 1 Another known hot-dip coating apparatus is disclosed by WO 2008/098687, wherein the present figures 1 and 2 show an example of an embodiment of this known device.
• This device which is initially shown in Figure 1, comprises two vertical punches 102 which are arranged on both sides of a container 110 which is filled with a molten metal 200.
• a cross-beam 103 is moved by means of vertical drives 104.
• On the cross-beam 103 hang two support arms 105, between which a roller 120 is rotatably mounted. After immersion in the molten metal, the metal strip is deflected by the roller 120 before it leaves the molten metal again upwards.
• FIG. 2 shows the container 110 with the molten metal 200 contained therein, wherein the bath level of the molten metal is identified by the reference symbol B.
• the roller 120 immersed together with its storage in the molten metal 200 can be seen.
• the roller journal 124 is visible, which is mounted in a roller bearing 144 in the bearing chamber 142 of the support arm 105.
• gas lines 170, 190 for feeding a gaseous medium, for example nitrogen, into the storage chamber 142.
• a lock 130 is arranged, which surrounds the roller pin 124 with a lock chamber 132.
• the lock 130 is just like the bearing housing 146 and the roller body 122 immersed in the molten metal 200 and therefore surrounded from the outside of the molten metal.
• the lock 130 and its lock chamber 132 are in the form of an immersion bell with a channel-shaped outlet 134, which is also immersed in the molten metal 200 during operation of the hot-dip coating apparatus; the outlet 134 is open to the molten metal.
• a partition wall terminates on the journal side with a bushing 137, which surrounds the journal 124 of the roller 120. Between the inner diameter of the bushing 137 and the outer diameter of the pin remains an annular gap 136 for a controlled passage of the gaseous Medium z. B. N 2 between the storage chamber 142 and the lock chamber 132nd
• the opposite to the roller body 122 associated wall 138 of the lock chamber is flexible according to Figure 2, for example, as a membrane, forms.
• the wall 138 terminates on the journal side with a sliding ring seal 139.
• this ring seal 139 is not one hundred percent tight on the pin side, but there remains a certain amount of leakage with respect to the pin 124.
• This leakage can affect both the gaseous medium z. B. N 2 , which can escape through the leakage from the lock chamber 132 in the surrounding molten metal 200, as well as in terms of the molten metal 200, which can pass through the leakage at the shaft passage 136 into the lock chamber 132.
• the sealing of the bearing 144 against penetration of the melt 200 shown in FIG. 2 functions as follows: Nitrogen is conducted into the storage chamber 142 through the gas line 190. There, the nitrogen flows around the bearing 144 before it flows through the annular gap 136 'in the lock chamber 132.
• the storage chamber 142 and the lock chamber 132 are formed communicating with each other via the annular gap 136 with respect to the nitrogen. Therefore, an equal gas pressure arises in both chambers.
• the gas pressure is chosen so large that penetration of the molten metal 200 through the open channel-shaped outlet 134 of the lock 130 into the interior of the lock chamber 132 is prevented. At the same time, this pressure acts against the flexibly formed outer wall 138 of the lock chamber 132.
• This outer wall 138 is externally loaded with the pressure exerted by the molten metal 200.
• the abrasive ring seal 139 is therefore pressed with the differential pressure between the gas pressure inside the lock chamber 132 and the pressure exerted by the molten metal 200 on the outer wall 138 pressure on the projection 123 or the roller body 122 with a force K parallel to the axial direction R of the roller.
• the gas pressure in the interior of the lock chamber 132 is suitably large for this purpose compared to that of the metering chamber. to dimension the pressure exerted on the molten metal. In this way, a penetrating through the shaft passage 136 amount, however, can not be completely avoided. Penetrating melt is to be fed through an exit 134 in the lock chamber 132 to the molten bath in the container 110 again.
• the sealing system for a hot-dip coating device for coating a metal strip with a molten metal
• the hot dip coating device comprises a roller immersed in the molten metal with a roller journal and a lock which surrounds the roller journal with a lock chamber
• the sealing system comprises a ring seal for sealing the lock chamber against the molten metal in the area of the passage of the roller journal into the lock chamber
• the hollow cylindrical ring seal is formed according to the invention parallel to the axis of rotation of the roller journal and the sealing system has a hollow cylinder slit in the direction of the axis of rotation of the roller journal.
• mige sleeve includes, which surrounds the parallel to the axis of rotation of the roller pin split formed, hollow cylindrical annular seal.
• This sealing system can effectively prevent infiltration of the molten metal into the lock chamber, allowing a long life of the roller bearing.
• the lock chamber can be formed simply and inexpensively, moreover, gaseous medium is saved, since less gas, for example nitrogen, can escape into the melt through smaller gap surfaces.
• the hollow cylindrical ring seal is divided parallel to the axis of rotation of the roller journal into separate segments of a hollow cylinder.
• the hollow-cylinder-shaped annular seal is formed by at least four separate segments of a hollow cylinder.
• the hollow cylindrical ring seal has at least one flange element which extends outwards perpendicularly to the axis of rotation of the roller pin and with which the hollow cylindrical ring seal adjoins the wall of the lock chamber directed towards the molten metal.
• the hollow cylindrical sleeve has exactly one slot in the direction of the axis of rotation of the roller journal and / or is designed such that it can exert a clamping effect on the segments of the hollow cylindrical annular seal.
• the separate segments of the hollow cylinder in a cross section perpendicular to the axis of rotation of the roller journal substantially in the form of circular arc segments.
• each circular arc segment essentially has a pitch circle circumference of 90 °.
• the ring seal is designed as a sliding seal which grinds on the roller body or on a projection of the roller pin.
• the invention also includes a hot-dip coating apparatus for coating a metal strip with a molten metal, a molten metal container and a roll immersed in the molten metal for deflecting or stabilizing the metal strip as it passes through the molten metal, the roller forming a roller body and one Roller pin has and a lock, which surrounds the roller journal with a lock chamber and means for supplying a gaseous medium with a gas pressure in the lock chamber for sealing the lock chamber against the molten metal, wherein the hot dip coating device comprises the above-described sealing system according to the invention.
• the invention comprises a method for operating a melt-dip coating device with a roller, which has a roller body and a roller journal and at least one lock, which surrounds the roller journal with a lock chamber, comprising the steps of: passing a metal strip through a molten metal, deflecting or stabilizing the metal strip in the molten metal by means of the roller and supplying a gaseous medium with a gas pressure in the lock chamber for sealing the lock chamber against the molten metal, wherein the lock chamber is sealed by a parallel to the longitudinal axis of the roller pin seal before the molten metal ,
• the seal is pressed against the roller journal perpendicular to the direction of the axis of rotation of the roller pin.
• the seal is pressed by a spring force on the roller journal.
• the seal is pressed by the gas pressure of the gaseous medium in the lock chamber with a force directed parallel to the axis of rotation of the roller journal force to the reel body or to a projection on the reel body.
• FIG. 1 and 2 show a known from the prior art device for hot dip coating.
• FIG. 3 shows an exemplary embodiment of a part of a hot dip coating device according to the invention. Further details of the invention are set forth in the detailed description of the embodiments.
• FIG. 1 shows a cross-section of a prior art arrangement of a hot dip coating device
• Figure 2 is a detail view of the cross section of Figure 1, in which in particular the region of the passage of the roller pin is shown in the lock chamber and in the roller bearing.
• FIG. 3 shows a schematic, perspective view of an embodiment according to the invention of a sealing system or of a part of a hot dip coating device according to the invention.
• FIG. 3 schematically shows an exemplary embodiment of a sealing system for a hot-dip coating device according to the invention.
• the hot dip coating device according to the invention is not shown as a whole in FIG.
• the general, superordinate structure of such systems is known from the prior art (see, for example, FIG. 1), the invention is primarily directed to the object of sealing the passage of the roller journal 224 through the wall of a lock chamber 232.
• FIG such a lock chamber 232 through the wall 233 of the roller pin 224 passes, shown schematically.
• the lock chamber 232 is present preferably, as known in the art, flooded with nitrogen having a differential pressure against the metal bath 200 to prevent the melt 200 from entering the lock chamber 232.
• the role, the roller body and the roller journal bearing are not shown in this figure for clarity.
• a substantially hollow cylindrical ring seal 225 or a hollow cylindrical ring 225 is provided according to the invention.
• This ring seal 225 is formed divided in the direction of the longitudinal axis or the axis of rotation of the roller journal 224. This means that in the ring seal 225 slots 228 and 228 column are provided parallel to the axis of rotation of the roller pin 224. These preferably run over the entire length of the ring seal 225 parallel to the axis of rotation of the roller pin 224 and are formed continuously in the radial direction. Thus, the ring seal 225 is divided into separate parts or segments.
• the ring seal 225 is formed by four separate segments of a hollow cylinder, which is divided parallel to the axis of rotation of the roller pin. But it is also possible that only two, three or even more than four such segments are provided. Viewed in a cross section which is perpendicular to the rotational axis of the pivot pin 224, these segments each have the shape of circular arc sections, wherein the circular arc sections or circular arc segments in the case of an annular seal 225 formed from four segments preferably has a partial circle circumference of substantially 90 ° exhibit.
• hollow cylindrical ring seal 225 around a hollow cylindrical sleeve 226 is provided which is formed parallel to the axis of rotation of the roller pin 224 slotted. It is preferably exactly one slot, which extends over the entire length of the sleeve and is formed continuously in the radial direction.
• the ring seal 225 may preferably have a flange 227 which adjoins the wall of the lock chamber 233 through which the roller pin passes.
• a flange 227 may be implemented in various ways. It can extend outwards perpendicularly to the surface of the cylindrical seal 225 and either adjoin the wall of the lock chamber 233 from the inside or adjoin the wall of the lock chamber 233 on the melt side. It can also have a groove which engages in the wall 233.
• flange constructions are known to the person skilled in the art.
• the flange 227 is provided adjacent to the inside of the lock chamber wall 233, being pressed by the gas pressure inside the lock chamber 232 against the wall of the lock chamber 233.
• the hollow cylindrical ring seal 225 may expand in the event of a warming roller pin 224 without blocking the pin 224 in the seal 225. Therefore, the fit of the ring seal 225 can be made narrow. As pin 224 heats up, the diameter of pin 224 increases, which in a non-split design would result in a ring seal to wear the seal or to block roll pin 224. Characterized in that the seal 225 is formed according to the invention divided, the parts or segments of the seal 225 can move with the increase in the roller journal diameter 224 to the outside. When the ring seal 225 reaches the inner diameter of the sleeve 226, it is spread open.
• the tightness of the lock chamber 232 is achieved in particular by the hollow cylindrical sleeve 226, which by their spring force, the hollow cylindrical ring seal 225 perpendicular to the direction of the axis of rotation of
• the sealing system according to the invention only has comparatively small openings or gaps or slots 228 through which molten metal could still penetrate into the chamber.
• the tightness in the region of the passage of the roll pin 224 through the wall of the lock chamber 233 is preferably ensured by the prevailing in the interior of the lock chamber 232 gas pressure or nitrogen pressure.
• the slot 229 in the sleeve 226 is arranged so that it lies in the radial direction over the outer surface of the hollow cylindrical annular seal 225, that is, in particular over a segment of the split, hollow cylindrical annular seal 225, so that the slot 229 of the sleeve 226 not over a gap or slot 228 of the split, hollow cylindrical ring seal 225 is located.
• the hollow cylindrical annular seal 225 is pressed in the direction of the roller body and / or any protrusion on the roller journal 224 or on the roller body.
• the sealing system according to the invention is preferably provided in a melt-dipping apparatus for coating a metal strip with a molten metal 200 comprising a container for the molten metal 200 and a roller immersed in the molten metal for deflecting or stabilizing the metal strip as it passes through the molten metal
• a melt-dipping apparatus for coating a metal strip with a molten metal 200 comprising a container for the molten metal 200 and a roller immersed in the molten metal for deflecting or stabilizing the metal strip as it passes through the molten metal
• a gaseous medium e.g., N 2
• the sealing system according to the invention can also be used for other types of hot dip coating apparatus.
• the sealing system described can also be provided in a device as known from FIG. This means, in particular, that the ring seal 139 shown in FIG. 2 is replaced by the proposed ring seal 225 according to the invention, including sleeve 226.
• the chamber wall 138 can then be formed either flexible or preferably rigid.
• the gur 2 shown channel 136 is omitted according to the invention.
• the channel-shaped output 134 may also be omitted according to the invention.
• Lock chamber wall B Metal bath mirror

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Coating With Molten Metal (AREA)
• Rolls And Other Rotary Bodies (AREA)

Applications Claiming Priority (2)

Publications (1)

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• 2009
  • 2009-07-21 DE DE102009034017A patent/DE102009034017A1/de not_active Withdrawn
• 2010
  • 2010-07-19 WO PCT/EP2010/004384 patent/WO2011009575A1/de active Application Filing
  • 2010-07-19 JP JP2011542846A patent/JP2012513540A/ja not_active Withdrawn
  • 2010-07-19 RU RU2011129307/02A patent/RU2011129307A/ru not_active Application Discontinuation
  • 2010-07-19 MX MX2012000938A patent/MX2012000938A/es not_active Application Discontinuation
  • 2010-07-19 CN CN2010800036747A patent/CN102245792A/zh active Pending
  • 2010-07-19 EP EP10735208A patent/EP2456902A1/de not_active Withdrawn
  • 2010-07-19 CA CA2746127A patent/CA2746127A1/en not_active Abandoned
  • 2010-07-19 AU AU2010275814A patent/AU2010275814A1/en not_active Abandoned
  • 2010-07-19 KR KR1020117011970A patent/KR20110088533A/ko not_active Application Discontinuation
  • 2010-07-19 US US13/257,096 patent/US20120003391A1/en not_active Abandoned
  • 2010-07-20 TW TW099123771A patent/TW201104096A/zh unknown

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