Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
  • B22D41/14—Closures

Definitions

• the invention relates to a closing and / or regulating element for the outflow of a metallurgical vessel, in particular for casting steel close to the final dimensions, with a stator and a rotor which can be rotated relative to this, the stator and rotor being provided with interacting sealing surfaces and in the region of the sealing surfaces in have an outflow channel opening through openings which can be made more or less overlapping by rotating the rotor.
• Inert gas can be supplied to a gas distribution chamber through a gas channel formed in the stator or in the rotor. This is intended to reduce wear on the sealing surfaces and through openings.
• DE 38 10 302 C2 describes a casting device for the continuous production of metal strip.
• a controlled gas pressure acts on the surface of the melt in a pouring chamber in order to regulate the bath level.
• Such a regulation is sluggish because it must act on the entire volume of the melt. No further control option is provided on the pouring nozzle itself.
• a closing and / or regulating member in which a rotor is rotatably mounted in a stator transversely to the flow direction of the melt.
• This structure is particularly suitable for strip casting or thin slab casting.
• an immersion spout is designed as a closing and / or regulating element with a stator and a rotor.
• a sump-forming chamber is designed in the outflow channel, which widens and smoothes the melt flow for thin slab casting or strip casting.
• the object of the invention is to propose a closing and / or regulating member of the aforementioned, which, in addition to the mechanical possibility of influencing the melt flow, also gives another possibility of this in order to be able to regulate the melt flow sensitively close to the outflow.
• a vacuum chamber is provided in the stator and / or in the rotor, which can be connected on the one hand to a vacuum generation unit via a duct line arranged in the stator and / or in the rotor and on the other hand lies above the through-openings and connects to the outflow duct stands.
• a negative pressure is brought into effect directly in the closing and / or regulating element.
• the negative pressure can act directly on the outflow channel. However, it is also possible to additionally apply the negative pressure at the sealing gap. It then also has a flow-controlling effect in the area of the through-openings and also sucks any melt that has entered the sealing gap upward into the vacuum chamber, so that such melt cannot escape to the outside. A melt film can then form in the sealing gap under the effect of the negative pressure and form a lubrication film for the rotation of the rotor in the stator.
• FIG. 1 shows a closing and / or regulating element, the rotor reaching into the stator from below
• FIG. 2 shows a closing and / or regulating element, with the rotor reaching over the stator from above
• FIG. 3 shows a further view of the embodiment according to FIG. 2,
• Figure 4 shows another embodiment of a closing and / or
• FIG. 5 shows a closing and / or control element with a swamp-forming element
• Chamber, Figure 6 is a closing and / or regulating member, the rotor in the stator is rotatably mounted about a transverse axis and Figure 7 is a closing and / or regulating member, the rotor from above in the
• Stator engages.
• a closing and / or regulating element for controlling the outflow of the melt (2) is arranged on the bottom of a metallurgical vessel (1).
• a rotor (4) is rotatably mounted in a stator (3).
• the stator (3) and the rotor (4) lie against one another on cylindrical sealing surfaces (5, 6), a sealing gap (7) being present between the sealing surfaces (5, 6).
• the stator (3) and the rotor (4) have through openings (8 and 9). By turning the rotor (4) the Bring through openings (8, 9) more or less so that the melt discharge can be controlled by turning the rotor (4).
• the through opening (9) of the rotor (4) merges into a vertical outflow channel (10) which is formed in the rotor (4) and opens into a mold (11).
• An end face (12) of the stator (3) is opposite an end face (13) of the rotor (4). There is an intermediate space between the end faces (12, 13) which, as described in more detail below, forms a vacuum chamber (14).
• the vacuum chamber (14) is open to the sealing gap (7). In addition, it is connected to the outflow channel (10) via at least one bore (15).
• a channel line (16) extends in the stator (16), which on the one hand opens into the vacuum chamber (14) on the end face (12) and, on the other hand, is connected to a vacuum generator (17) outside the vessel (1).
• the vacuum generator (17) can be controlled by a control device (18).
• the control device (18) detects the melt level of the mold (11) via an upper sensor (19) and a lower sensor (20). Other means for detecting the melt level in the mold (11) can also be provided.
• a drive unit (21) with which the rotor (4) can be rotated about the longitudinal axis (L) can also be connected to the control device (18).
• the functioning of the locking and / or regulating element described is approximately as follows: If the through-openings (8, 9) are brought into a more or less aligned position by turning the rotor (4), then melt flows through the through-openings (8, 9) under the effect of the ferrostatic pressure of the melt (2) in the metallurgical vessel (1). 9) and the outflow channel (10) into the mold (11).
• the ferrostatic pressure depends on the respective level of the melt in the vessel (1).
• the vacuum generator (17) creates a vacuum in the vacuum chamber (14). This acts on the one hand in the sealing gap (7) and on the other hand in the outflow channel (10). It counteracts the ferrostatic pressure of the melt (2) in the vessel (1). It also acts in the sealing gap (7) in such a way that melt entering the sealing gap (7) cannot escape to the outside.
• the rotor (4) protrudes into the vessel (1) from above. It overlaps the stator (3) projecting into the vessel (1) from below.
• the outflow channel (10) is formed in the stator (3).
• the space between the end faces (12 and 13) does not serve as a vacuum chamber here.
• the vacuum chamber (14) lies in the stator (3) above the through openings (8, 9) and is one upper extension of the outflow channel (10).
• the channel line (16) is also formed in the stator (3). It opens at the top into the vacuum chamber (14) and is led out downwards within the cylindrical sealing surface (5) and connected to the vacuum generator (17).
• the mode of operation corresponds to the mode of operation described for the exemplary embodiment according to FIG. 1, with the exception that the negative pressure in the negative pressure chamber (14) does not act on the sealing gap (7). If the vacuum should also act on the sealing gap (7) in this exemplary embodiment, then a bore corresponding to the bore (15) is provided in the end face (12) of the stator (3).
• the stator (3) is fastened in the vessel (1). Its outflow channel (10) merges into an extension piece (26) which projects into the mold (11). The stator (3) extends beyond the melt level in the vessel (1).
• the rotor (4) is placed on the stator (3) and is formed by a tubular part on which a head piece (29) is placed on top. A drive unit (21), with which the rotor (4) can be rotated, acts on the head piece (29).
• the duct line (16) opens into the vacuum chamber (14) existing at the top in the stator (3).
• the duct line (16) extends through the rotor (4) and its head piece (29) upwards to the vacuum generator (17).
• the stator (3) is arranged below the vessel (1).
• the rotor (4) is rotatably mounted in the stator (3).
• the rotor (4) is not rotatable about the longitudinal axis (L), but about the transverse axis (Q).
• the rotor (4) forms a cylindrical body through which the through opening (9) extends radially.
• the outflow channel (10) is formed in the stator (3) below the rotor (4).
• a sump-forming chamber (23) is formed below the rotor (4), which merges with an overflow edge (24) into a part (25) leading into the mold (11).
• the part (25) of the outflow channel (10) is slit-shaped in cross section for thin slab casting.
• the channel line (16) In the flow direction of the melt after the overflow edge (24) opens into the part (25), the channel line (16), which is connected to the vacuum generator (17).
• the channel line (16) can also open from above directly above the overflow edge (24) or from above into the sump-forming chamber (23). It is also possible to design a vacuum chamber which widens towards the mouth between the mouth and the duct (16).
• the mode of operation is essentially the same as that described above.
• the flow rate of the melt leaving the outflow channel (10) can be controlled by controlling the negative pressure in the channel line (16).
• the rotor (3) and stator (4) are constructed approximately as described in DE 38 05 071 C2.
• the rotor (4) can be rotated in the stator (3) about a transverse axis (Q).
• the vacuum chamber (14) is formed in the stator (3) above its through openings (8).
• the vacuum chamber (14) opens into the through openings (8).
• the stator (3) and the vacuum chamber (14) extend beyond the level of the melt (2) in the vessel (1).
• the cross-sectional area of the vacuum chamber (14) is larger than the cross-section of the outflow channel (10) in the vicinity of the rotor (4).
• the operation of the embodiment according to FIG. 6 is essentially the same as the operation described.
• the speed at which the melt enters the through-openings (9) of the rotor (4) through the through-openings (8) can be controlled by controlling the vacuum in the vacuum chamber (14).
• the rotor (4) protrudes into the vessel (1) from above.
• the stator (3) is attached to the bottom of the vessel (1).
• the rotor (4) and the stator (3) touch in this embodiment spherical spherical sealing surfaces (5 ', 6').
• the through openings (8, 9) are located in the area of the sealing surfaces (5 ', 6').
• the outflow channel (10) is formed in the stator (3) and continues in an extension piece (26) into the mold (11).
• the rotor (4) is provided with an outflow opening (27) which is central to the longitudinal axis (L).
• the horizontal cross section of the vacuum chamber (14) formed in the interior of the rotor (4) tapers from the through opening (9) to the outflow opening (27).
• the vacuum chamber (14) extends in the embodiment of FIG. 7 to the mirror of Melt (2) in the vessel (1). This increases the influence of the negative pressure on the melt flowing from the through openings (8, 9) to the outlet opening (27) and thus into the outflow channel (10).
• the vacuum chamber (14) in such a way that its upper limit lies above the level of the melt (2) in the vessel (1).
• the rotor (4) according to FIG. 7 is oscillating at the top of a bearing device (28), so that its spherical sealing surface (6 ') lies tightly on the sealing surface (5') of the stator (3) in every rotational position.
• the weight and on the other hand a pressure acting on the bearing device (28) improve the contact of the sealing surfaces (5 ⁇ 6 ').
• the rotor (4) can be rotated about the longitudinal axis (L) by means of the bearing device (28).
• the channel line (16) opening into the rotor (4) leads to the vacuum generator (17).

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
• Jet Pumps And Other Pumps (AREA)
• Battery Electrode And Active Subsutance (AREA)
• Continuous Casting (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=6534365

Family Applications (1)

Country Status (10)

Families Citing this family (3)

Family Cites Families (7)

• 1994
  • 1994-11-29 DE DE4442336A patent/DE4442336A1/de not_active Withdrawn
• 1995
  • 1995-11-25 BR BR9506593A patent/BR9506593A/pt not_active IP Right Cessation
  • 1995-11-25 EP EP95941018A patent/EP0741621A1/de not_active Withdrawn
  • 1995-11-25 CN CN95191379.4A patent/CN1139897A/zh active Pending
  • 1995-11-25 CA CA002177843A patent/CA2177843A1/en not_active Abandoned
  • 1995-11-25 US US08/682,770 patent/US5686008A/en not_active Expired - Fee Related
  • 1995-11-25 RU RU96117246A patent/RU2145533C1/ru active
  • 1995-11-25 JP JP8518165A patent/JPH09508860A/ja active Pending
  • 1995-11-25 WO PCT/EP1995/004650 patent/WO1996016757A1/de not_active Application Discontinuation
  • 1995-11-29 ZA ZA9510153A patent/ZA9510153B/xx unknown

Non-Patent Citations (1)

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