Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
  • B22D11/12—Accessories for subsequent treating or working cast stock in situ
  • B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
  • B22D11/1246—Nozzles; Spray heads
• • 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
  • B21B45/02—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 for lubricating, cooling, or cleaning
  • B21B45/0203—Cooling
  • B21B45/0209—Cooling devices, e.g. using gaseous coolants
  • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
  • B21B45/0233—Spray nozzles, Nozzle headers; Spray systems
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
  • B22D11/08—Accessories for starting the casting procedure
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
  • B22D11/16—Controlling or regulating processes or operations
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
  • B22D11/16—Controlling or regulating processes or operations
  • B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould

Definitions

• the invention relates to a spray nozzle adjustment in a strand guide a continuous casting for the production of metal strands of different strand width, wherein the strand guide comprises supported in a scaffolding frame strand guide rollers which form a transport path for the metal strand and this transport path in a normal to the strand conveying direction plane between adjacent strand guide rollers at least two spray nozzles are positioned, which are each connected to an adjusting device for changing the distance of the spray nozzles to each other and to change the normal distance of the spray nozzles from the surface of the transport path.
• the coolant usually atomized water or a water-air mixture, is spray-shaped by means of spray nozzles into a free space between successive in the strand conveying direction strand guide rollers. Since in a continuous casting usually metal strands are cast with different strand width, it is necessary to position the spray nozzles so that a uniform coolant loading of the strand surface is achieved in a direction normal to the strand transport direction plane. In strands with slab cross-sections, this cooling is limited here mainly to the broad side surfaces of the cast strand.
• a nozzle adjustment device is already known in which a plurality of spray nozzles on a lever system, e.g. are articulated in the manner of a parallel link system.
• An adjustment of this lever system causes in the described embodiment with three arranged in a plane spray nozzles the formation of three Sprühf kauern that are adjustable at each selected slab width with constant overlap area and without overmolding the slab edges from an operating position to another operating position.
• an element of the lever mechanism is moved with an adjusting spindle in the desired direction.
• the Düsenverstell featured in the strand guide at a small distance to the hot metal strand in a thermally highly loaded area and are also subject to a high pollution load, so that the joints of these complex kinematic chains are prone to failure in their functionality.
• these movable internals are in the strand guide elements or segments in hard to reach areas, making repair work are difficult to perform.
• Object of the present invention is therefore to avoid the disadvantages described above and to propose a Spritzdüsenverstell Surprise, which is characterized by particular ease of maintenance and good accessibility.
• This object is achieved on the basis of a spray nozzle adjustment of the type described above in that each arranged in a plane normal to the strand conveying direction spray nozzle is associated with a spray nozzle holder and the spray nozzle holder is attached to a control piston at least one adjustment, wherein at an axial adjustment of the actuating piston an adjustment movement of the spray nozzles parallel to this axial adjustment movement takes place and the adjusting device is fastened to the scaffolding frame of the strand guide in a region remote from the transport path, preferably to the largely freely accessible outer regions of the strand guide.
• all adjustment and control devices are positioned in a remote from thermal influence area. An arrangement which is stable under the given operating conditions is ensured by a connection of these two components which does not allow any relative movement between the adjusting piston and the spray nozzle holder.
• the angle of inclination of the adjusting piston of the adjustment is tuned to the imaginary surface of the transport path in a plane normal to the strand conveying direction on the opening angle of the emerging from the spray nozzle coolant jet.
• the opening angle of the coolant jet is also in this plane.
• the opening angle of the coolant jet issuing from the spray nozzle and thus the design of the spray nozzle must be determined so that the spray pressure of the coolant jet impinging on the strand surface does not vary too much depending on the distance of the spray nozzle from the metal strand surface.
• the opening angle and the distance of the nozzle opening from the strand surface, the specific coolant application and thus the cooling power is influenced at the strand surface.
• treated cooling water water cooling
• a nebulizer preferably air
• atomized cooling water air-mist cooling
• the number of necessary adjustment along the strand guide should be minimized. This can be achieved by assigning spray nozzles arranged one behind the other along the transport path in a plurality of successive planes in the strand conveying direction to a spray nozzle holder extending in the strand conveying direction and being synchronously adjustable with the latter. To avoid vibrations on the spray nozzle holder and to its general stabilization of the spray nozzle holder is guided with at least one guide element on the adjusting device.
• the longitudinal axis of the adjusting piston of the adjusting device and the longitudinal axes of the at least one guide element are arranged in a plane and the adjusting piston of the adjusting device is preferably arranged between two guide elements.
• the adjusting device preferably comprises a hydraulically or pneumatically actuated pressure medium cylinder.
• the spray nozzle comprises in addition to the actual nozzle body, in which the atomization of the spray and at the outlet opening of which the formation of the Sprühfumbleers takes place, a coolant line and a coolant passage, wherein the coolant passage is connected to the spray nozzle holder, and the coolant line in a guide element in a plane lying normal to the strand conveying direction is slidably guided and the guide element is fixed in a strand guide roller support frame on the scaffolding frame of this strand guide roller support frame.
• the coolant line comprises in a two-fluid cooling both a conduit for the cooling water and a line for the Zerstäuberstoff.
• the guide element for receiving the coolant line is formed as a guide fork with a lying in a normal to the strand conveying direction open guide slot.
• the guide member may be adjustably configured to allow accurate positioning of the spray nozzles between successive strand guide rollers.
• the coolant passage is designed as a rotary feedthrough which forms a pivoting movement in one parallel to the strand conveying direction lying level permits.
• the coolant line is reinforced with a support plate in a direction normal to the strand conveying direction plane.
• the spray nozzle holder of the external spray nozzles are connected to a connecting linkage and arranged between these outer spray nozzles further spray nozzles are suspended with their spray nozzle holders on this connecting linkage.
• a structurally simple embodiment is that in the arrangement of at least 3 spray nozzles in a plane lying normal to the strand conveying direction, the inner spray nozzles are fixed to an immovably fixed spray nozzle holder.
• a displacement sensor and a preferably hydraulic actuator for position setting of the actuating piston assigned, which in turn are connected to the plant control system.
• the adjusting device for positioning the spray nozzles comprises a hydraulic actuator with switching valves, which are controlled via a three-point controller or via a pulse width modulated controller.
• FIG. 1 shows the basic principle of the spray nozzle adjustment device according to the invention for two different strand widths on one side of a cast steel strand in a schematic representation in a sectional plane normal to the strand transport direction through the strand guide of a continuous casting plant
• Fig. 2 shows the basic principle of the spray nozzle adjustment device according to the invention at two different strand widths on one side of a cast steel strand in a schematic representation in a partial longitudinal section through the strand guide of a continuous casting plant
• FIG. 3 shows a representation of the geometric change in position of a spray nozzle between adjacent strand guide rollers in a curved strand guide
• FIG. 5 shows the attachment of a spray nozzle to a spray nozzle holder according to a second possible embodiment
• FIG. 6 is a plan view of an adjustment with spray nozzle holder
• FIG. 7 shows a possible embodiment of the spray nozzle adjustment device according to the invention with 3 spray nozzles in a sectional plane normal to the strand transport direction through the strand guide of a continuous casting plant.
• FIG. 1 the arrangement of the invention Spritzdüsen- adjusting is shown schematically in the strand guide of a slab continuous casting.
• Fig. 2 illustrates in a partial longitudinal section through the continuous casting the transition region from a bent portion of the strand guide in a straight portion of the strand guide in the outlet region of a continuous casting, on the basis of the essential components of the spray nozzle adjustment and its advantages in these two geometrically different positions are obvious ,
• metal strand 1 is supported after the exit from the continuous casting mold in a strand guide 2 of strand guide rollers 3 at the opposite broad side surfaces 1a, 1b and through the strand guide in strand conveying direction R of a substantially vertical casting direction in a horizontal transport direction diverted.
• each spray nozzles 4, 5, 6, 7, 8 are arranged, wherein in a plane normal to Strangtransportides, for example, in a sectional plane in the spray nozzle 5, two spray nozzles 5a, 5b are arranged, with which fan-shaped coolant jets 9a, 9b are applied to a broad side surface 1a of the metal strand 1 that a largely even coolant is applied. If, for example, a metal strand 1 ' wider than the metal strand 1 is cast, the positions of the spray nozzles 5a, 5b are adjusted according to the positions represented by the reference numerals 5a ' and 5b 'in dashed lines.
• This automatically fan-shaped coolant jets 9a ' and 9b ' are set, with which in turn the entire strand width can be uniformly cooled.
• the required amount of coolant can be regulated, for example, by an increased injection pressure to the now larger strand width.
• Each spray nozzle 5a, 5b is connected to a spray nozzle holder 10, which in turn with the adjusting piston 11 of an adjusting 12, no relative movement permitting, is firmly connected.
• the adjusting device 12 is indicated only schematically with the actuating piston 11 by a joint movement possibility of the actuating piston and the spray nozzle holder 10 illustrative double arrow.
• the adjusting device 12 comprises a hydraulically or pneumatically actuable pressure cylinder 40.
• the spray nozzle holder 10 is, for example, in a format change from a metal strand 1 with a first widths to a metal strand 1 'with a second, for example, greater width by retracting the control piston 11 of the adjusting 12 in one Position corresponding to the spray nozzle holder 10 ' brought, whereby the optimum for this casting width coolant jet is adjusted.
• the adjusting device 12 is attached to the frame construction of the strand guide 2 in a region which is as far as possible from the hot metal strand, thus on a support bracket 13 on the side remote from the hot metal strand 1 side of the strand guide frame construction.
• a plurality of spray nozzles 4, 5, 6 or 7, 8,... Arranged one behind the other in this respective area in the strand conveying direction are fastened to a common spray nozzle holder 10, 10 ' and can be adjusted together in the case of an adjusting movement exerted on the spray nozzle holder.
• the strand guide is composed of several strand guide segments, all in the strand conveying direction arranged one behind the other and attached to a extending over the longitudinal extent of the strand guide segment spray nozzle holder spray nozzles be positioned together with an adjustment of the spray nozzle holder.
• spray nozzle holder spray nozzles be positioned together with an adjustment of the spray nozzle holder.
• each spray nozzle 4, 5, 6 within the arcuate strand guide with a coolant passage 15 is pivotally mounted on the spray nozzle holder 10.
• the long coolant line 16 which extends transversely through the frame construction of the strand guide between the coolant passage 15 and the spray nozzle head 17, is guided in a guide element 18, which is fastened to the frame construction of the strand guide.
• the guide element 18 is designed as a guide fork 19 with a guide slot 19a which is open in a plane normal to the strand conveying direction.
• the coolant line 16 is slidably fixed in position and allows alignment of the spray nozzle head 17 and thus the coolant jet 9 to the center between adjacent strand guide rollers 3a, 3b by the pivotable
• the coolant passage 15 or the spray nozzle 4, 5, ... on the spray nozzle holder 10 Fixing the coolant passage 15 or the spray nozzle 4, 5, ... on the spray nozzle holder 10, a bending of the spray nozzle in the region of the coolant line is avoided.
• the guide elements 18 are attached to the frame structure of the strand guide 2, not shown.
• 16 support plates 20 are arranged in the region of cranked coolant lines, which reinforce the bending or vibration stability of the coolant lines in a plane normal to the strand conveying direction (FIG. 1).
• the coolant line comprises a line for the actual coolant and a line for the atomizer.
• the mixture of the two components and the formation of the coolant jet 9 takes place in the spray nozzle head 17th
• the spray nozzle holder 10 comprises two profile tubes 22, 23 for the supply, passage and distribution of a coolant, such as treated cooling water, and a Zerstäubermediums, preferably air, to any number of spray nozzles 4.
• the profile tubes 22, 23 are provided with connecting tabs 24, 25th connected to the vibration-stable spray nozzle holder.
• the profile tubes are laterally associated mounting strips 26, 27, 29 in the region of openings 28, mounting surfaces 30 for the tight attachment of the coolant passage 15 of the spray nozzle.
• the passage openings 28, 29 correspond to media lines in the spray nozzle, which are indicated by the center lines.
• the passage openings 28, 29 in the mounting strips 26, 27 are optionally formed as slots 32, to give rise to no cross-sectional constriction even with a pivoting movement of the spray nozzle.
• the spray nozzle is fastened with a connecting screw 31 on the spray nozzle holder 10.
• a spring element and the through holes sealing elements can be assigned.
• FIG. 10 A second preferred embodiment for the structural design of the spray nozzle holder 10 and an attachment of the spray nozzle 4 to the spray nozzle holder is illustrated in FIG.
• the spray nozzle holder 10 in turn comprises two spaced apart firmly connected profile tubes 22, 23 for the supply of coolant and atomizer to the spray nozzles.
• slide bushings 33 are welded for the rotatable recording of rotary unions 34, through which the coolant and the atomizer through passages 28, 29 into the coolant passage 15 of the spray nozzle 4 is passed.
• the spray nozzle 4 is with its coolant passage 15 at the Mounted mounting surface 30 of the rotary feedthrough 34 and pivotally supported together with the rotary feedthrough and axially limited in the direction of the pivot axis 36 by a collar 37 in the slide bushes 33 of the spray nozzle holder 10.
• the passage openings 28, 29 are sealed by a plurality of sealing rings 38 in the transition region of the slide bushing for rotary feedthrough.
• the adjusting device 12 comprises a hydraulically or pneumatically actuated pressure medium cylinder 40 with an actuating piston 11 which is rigidly connected to the spray nozzle holder 10.
• the spray nozzle holder carries two guide elements 41 formed by guide rods, which are arranged on both sides of the actuating piston parallel to this, lying in a common plane with the actuating piston 11.
• the guide elements 41 pass through the base frame 42 of the adjusting and are slidable in this in the axial direction of the guide elements and perform upon actuation of the pressure medium cylinder 40 with a synchronous with the actuating piston 11 movement.
• the guide elements 41 are used to stabilize the spray nozzle holder 10.
• At the spray nozzle holder are each an elastic feed lines 43, 44 for coolant and atomizer for media supply of six spray nozzles 4, 5, 6, 7 ... connected. This ensures a substantial simplification of the coolant piping in the structurally restricted strand guide.
• Fig. 7 shows the arrangement of 3 spray nozzles 5a, 5b, 5c in a direction normal to the strand conveying direction plane between adjacent strand guide rollers. While the outer, the edge regions of a slab cooling spray nozzles 5a, 5b are arranged in the already described with reference to Fig. 1 type to different strand widths, the inner, the central region of the slab cooling spray nozzle 5c is unchangeable in position. It is arranged on a permanently mounted spray nozzle holder 10. However, it is also possible that the spray nozzle holder of this centrally located spray nozzle is connected to the actuating piston of an adjusting device 12 shown in dashed lines and all 3 spray nozzles are adapted with matched adjustment movements at different strand widths.
• Each adjusting device 12 are associated with control and regulating devices 45 which are connected to the system control system 46 and which comprise at least one displacement sensor and a preferably hydraulic actuator for positional determination of the spray nozzles (Fig. 1).
• control and regulating devices 45 which are connected to the system control system 46 and which comprise at least one displacement sensor and a preferably hydraulic actuator for positional determination of the spray nozzles (Fig. 1).
• control system 46 basic settings of the continuous casting plant are made, which are given for example by the specification of a G cashformates and the steel quality and predetermine the position of the spray nozzles in the strand guide. These default values for the positioning of the spray nozzles are approached synchronously by the control and regulating devices.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Continuous Casting (AREA)
• Nozzles (AREA)
• Reciprocating Pumps (AREA)
• Pressure-Spray And Ultrasonic-Wave- Spray Burners (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (2)

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ID=38196582

Family Applications (1)

Country Status (10)

Cited By (2)

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• 2006
  • 2006-04-25 AT AT0069906A patent/AT503526B1/de not_active IP Right Cessation
• 2007
  • 2007-02-27 UA UAA200813193A patent/UA95477C2/uk unknown
  • 2007-02-27 DE DE502007003406T patent/DE502007003406D1/de active Active
  • 2007-02-27 WO PCT/EP2007/001658 patent/WO2007121804A1/fr not_active Ceased
  • 2007-02-27 PL PL07711678T patent/PL2010347T3/pl unknown
  • 2007-02-27 EP EP07711678A patent/EP2010347B1/fr active Active
  • 2007-02-27 AT AT07711678T patent/ATE463311T1/de active
  • 2007-02-27 KR KR1020087028835A patent/KR20090010999A/ko not_active Ceased
  • 2007-02-27 RU RU2008146398/02A patent/RU2431542C2/ru not_active IP Right Cessation
  • 2007-02-27 CN CN200780015171XA patent/CN101432086B/zh active Active
  • 2007-02-27 ES ES07711678T patent/ES2343380T3/es active Active

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