EP0296443A2 - Procédé et dispositif pour le remplissage automatique d'une lingotière de coulée continue - Google Patents

Procédé et dispositif pour le remplissage automatique d'une lingotière de coulée continue Download PDF

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Publication number
EP0296443A2
EP0296443A2 EP88109386A EP88109386A EP0296443A2 EP 0296443 A2 EP0296443 A2 EP 0296443A2 EP 88109386 A EP88109386 A EP 88109386A EP 88109386 A EP88109386 A EP 88109386A EP 0296443 A2 EP0296443 A2 EP 0296443A2
Authority
EP
European Patent Office
Prior art keywords
stopper
plug
pressure
spring elements
closed
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.)
Withdrawn
Application number
EP88109386A
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German (de)
English (en)
Other versions
EP0296443A3 (fr
Inventor
Josef Lothmann
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.)
Zimmermann and Jansen GmbH
Original Assignee
Zimmermann and Jansen GmbH
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
Priority claimed from DE19873720586 external-priority patent/DE3720586A1/de
Priority claimed from DE19873738489 external-priority patent/DE3738489A1/de
Application filed by Zimmermann and Jansen GmbH filed Critical Zimmermann and Jansen GmbH
Publication of EP0296443A2 publication Critical patent/EP0296443A2/fr
Publication of EP0296443A3 publication Critical patent/EP0296443A3/fr
Withdrawn legal-status Critical Current

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    • 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
    • B22D11/10—Supplying or treating molten metal
    • 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
    • B22D41/16—Closures stopper-rod type, i.e. a stopper-rod being positioned downwardly through the vessel and the metal therein, for selective registry with the pouring opening
    • B22D41/20—Stopper-rod operating equipment
    • 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
    • B22D11/18—Controlling or regulating processes or operations for pouring
    • B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
    • B22D11/187—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level by using X-rays or nuclear radiation

Definitions

  • the invention relates to a method for automatically filling a continuous casting mold according to the preamble of claim 1 or 7 and devices therefor.
  • continuous casting plants work according to the same basic mechanical concept. They consist of a ladle turret or ladle wagon, distributor channel wagons, molds with a die lifting drive, casting machine (strand drives), cold strand devices, roller tables for removal, separating devices for strand division, tractors and other devices for the treatment of the cast material, especially steel.
  • a process control system for continuous casting plants must include all automation equipment required for optimal process control.
  • the measuring and control devices comprise the two subsystems, drive control and process control.
  • a part system is the mold level control, which can be assigned to the drive control due to its interfaces and structure.
  • the casting level control is used to keep the steel level in the mold at a preselectable level during casting.
  • a deviation from the preselected mold level is achieved by changing the flow of steel from the tundish or the intermediate container into the mold, by changing the take-off speed or by a combination of both processes.
  • the achievable accuracy of the mold level control essentially depends on the potted format, the take-off speed, the setting characteristics, the plugs and pouring stones used and the system-related disturbance variables.
  • Electrohydraulic actuators with proportional actuation character prevailed as plug actuators. These drives are supplied both in the version with adjusting levers and in the version with separate adjusting cylinder.
  • the first version predominates, which requires mechanical transfer of the travel.
  • the arrangement with a separate actuating cylinder has prevailed.
  • the positioning cylinder is attached directly to the parallel guide of the plug mechanism in order to keep the play of mechanical transmission elements to a minimum.
  • the quality of the plug mechanism does not meet the high requirements.
  • the quality of the correct operation of the entire mold level control system depends on its quality.
  • the plug covers only a very short, a few millimeters long way from the "to" position to the "full flow” position. Therefore, the position of the actuator must be transferred accurately and with little play to the plug, so as to create the prerequisite for the proper functioning of the control device.
  • the importance of the present invention lies in the elimination of the stopper mechanism and the play of mechanical transmission elements inherent in it, so that a highly precise stopper movement and thus mold level control can be achieved. At the same time, the highest level of security is ensured in that the stopper is always under the load of an elastic element which tries to bring the stopper into the closed position with increasing temperature in a correspondingly increasing manner.
  • one or more closed gas pressure springs according to DE-C-24 06 006 are preferably used as the elastic element, which have already proven their worth in the field in question.
  • gas pressure springs of the type mentioned can also be used as an actuator, but in each case open, ie connected to a gas pressure source, so that they can be moved against the action of the elastic element mentioned with a corresponding movement of the stopper.
  • EP-B-32 442 it is known from EP-B-32 442 to move the stopper of an intermediate container up or down in a copper or aluminum casting installation by means of an actuator which acts directly on the stopper head, namely against the effect of a helical compression spring that tries to push the plug into the closed position.
  • the actuator comprises a housing with a membrane to which the upper end of the plug rod is directly attached. Depending on the bath level, more or less pressure medium is introduced into the housing with the corresponding movement of the membrane or stopper rod mentioned.
  • the known arrangement is not suitable for continuous steel casting plants because of the much higher temperatures.
  • the known membrane actuator can be exposed to a maximum temperature of about 100 ° C.
  • temperatures in operation exceed well over 1,000 ° C.
  • a helical compression spring as a restoring element for the stopper is unsuitable at such high temperatures. The spring would literally "collapse" under load.
  • the membrane of the known membrane actuator would behave similarly, so that the known construction is at most suitable for copper or aluminum casting plants.
  • thermodynamic elements As already briefly explained above, the spring elements according to DE-C-24 06 006, which have been tried and tested in the ladle gate area for years and which do not lose their functional reliability even under extreme temperature conditions, are particularly suitable as thermodynamic elements.
  • the plug control according to the invention can therefore be carried out without any problems using the spring elements mentioned.
  • the stopper rod can thus be moved up and down without tolerance, with automatic drive depending on the casting or bath level in the mold.
  • the system according to the invention offers the possibility of oscillatingly moving the stopper up and down and / or turning it back and forth without the effect of the oscillation drive being lost through the play of mechanical transmission elements.
  • the oscillation frequency is preferably 2 to 20 Hz.
  • the oscillation of the stopper favors the outflow of the molten steel past the stopper through the bottom opening of the distribution channel or the intermediate container. It also helps to reduce deposits at the lower end of the plug, so that the life of the plug is considerably extended.
  • the plug guarantees a tight seal of the bottom opening even after several castings.
  • the system according to the invention is particularly suitable for the so-called sequence casting.
  • the proposed oscillation of the stopper is also claimed independently of the other features of the system according to the invention. It can only be realized particularly advantageously or effectively in the context of the system according to the invention.
  • the rotary oscillation or oscillation of the stopper about its longitudinal axis is particularly advantageous in the recently offered rotary stopper (Tundish Rotary Valve), in order to ensure the smooth movement of the rotary stopper with respect to the bottom outlet opening, which serves as an abutment.
  • the construction according to the invention (elastic element / actuator) and its arrangement on the plug head are also suitable for the rotary plug mentioned.
  • the rotary plug can thus be relieved of pressure before each actuating movement, with the result that it can be moved more easily into the desired rotational position. In this way, the breakaway torque is minimized before each actuating movement. This enables precise and responsive adjustment movements of the rotary plug.
  • the construction according to claim 9 is characterized by a particularly low overall height.
  • the measures according to claim 10 make it possible to do without a cross member or flag for the stopper that can be moved vertically up and down. In principle, it is also conceivable to make the elastic element variable; only then is the security of the arrangement required at the outset no longer guaranteed to the effect that the stopper is moved into the closed position immediately with maximum restoring force when the actuator is depressurized.
  • Claim 18 relates to a particularly insensitive embodiment, since the stopper closing element is formed by a mere mass which, after falling below a predetermined actuating or stopper stroke pressure on the stopper actuators, inevitably urges the stopper into the closed position.
  • the stopper sealing compound mentioned is insensitive to temperature. It also allows a compact construction of the drive head, provided that the stopper adjusting elements are supported on the stopper sealing compound within vertical bores in the stopper closing compound.
  • stopper closing elements As spring elements, it is advantageous to keep them at the lowest possible temperature.
  • the measures according to claim 19 serve for this purpose.
  • the measures according to claim 20 and / or 21 permit a particularly advantageous stopper stroke control.
  • Claims 12 to 15 relate to another type of stopper stroke control, in which, however, leaks are not compensated for or only insufficiently, as is the case with the construction according to claims 20 and / or 21.
  • a distribution channel 10 with a fire-resistant lining 11 and a protective layer 12 which contains liquid metal, e.g. Molten steel 13.
  • the distribution channel 10 has a bottom opening 14.
  • the bottom opening 14 is defined by a perforated brick 16 and an immersion tube 17 which protrudes into a mold 18.
  • a casting level control is provided. This consists of a measuring device for the casting level 19 in the Chill mold 18 and is formed by mutually opposite radioactive rod emitters 20 and a scintillation counter 21 as a receiver.
  • the stopper 15 is arranged at the free end of a crossmember or flag 22 so that it can be raised and lowered or moved up and down.
  • the flag 22 is connected to a rod 24 which is vertically displaceable in a guide 23 fastened to the distribution channel 10.
  • the vertical adjustment of the rod 24 is carried out either manually by means of a manually operated (hand lever 25) gear segment 26, which engages in a corresponding toothing on the rod 24, or by means of a hydraulically actuated step-adjusting cylinder 27, to which a displacement sensor 28 is assigned.
  • the zero position of the stopper 15 is determined, which corresponds to the closed position of the stopper 15 when the actuator "B" for the stopper 15 is depressurized and will be described further below before the introduction of molten steel 13 into the distribution channel 10.
  • the stopper 15 is held in contact with the opening edge 29 of the bottom opening 14 under predetermined pressure (permanent upstream pressure according to FIG. 4).
  • a locking device 30 This is a pneumatically operated piston-cylinder unit, the piston rod 31 of which is guided outwards and laterally against the rod carrying the flag 22 24 can be pressed while blocking the same.
  • the locking device 30 described can be connected via a compressed air line 32 and a changeover switch 33 to a compressed air source 34 which is under a pressure of approximately 6 bar.
  • the rod guide 23 together with the flag 22 and the plug 15 is arranged such that it can be pivoted about a horizontal axis 36 in such a way that the plug 15 can be pivoted out of the distribution channel 10 for the purpose of repairing or changing a plug.
  • the step-adjusting cylinder 27 comprises a piston 37 which can be acted upon from two sides and whose outwardly projecting piston rod 38 is connected to the vertically displaceable rod 24.
  • the two cylinder chambers of the step-adjusting cylinder 27 are either via hydraulic lines 39, 40 and a 3/4-way valve 41 either with a pump "P", a tank “T” or neither with pump “P” nor with tank “T” (see 1) connectable.
  • the 3/4-way valve is solenoid-controlled, the control signal being dependent on the displacement sensor 28 assigned to the step-adjusting cylinder 27, specifically via the signal connection 35, 42.
  • thermodynamic precision drive head 43 which is arranged between the flag 22 and the plug 15 and which, with increasing temperature, pushes the plug 15 correspondingly increasingly into the closed position in the closing position and an elastic plug closing element against the action thereof
  • Elements "A” effective, namely pneumatically operated actuator "B” includes.
  • the plug closing element “A” and the actuator “B” are arranged within a frame or housing 44 connected to the flag 22, one above the other, the thermodynamic closing element "A” being positioned above the thermodynamic element "B".
  • a flange 46 Arranged between “A” and “B” is a flange 46 which is movable in the direction of the upward and downward movement (double arrow 45) of the stopper 15 relative to the frame 44 and to which the stopper 15 or the stopper rod 47 is connected.
  • thermodynamic closing element "A” is thus supported at the top on the frame 44 on the one hand and at the bottom on the carrier flange 46 on the other hand, while the thermodynamic actuating element "B" arranged below it is supported at the top on the carrier flange 46 on the one hand and below on the frame 44 on the other hand.
  • thermodynamic closing element “A” comprises a plurality of spring elements 48 arranged over the circumference, each in the form of closed gas pressure springs in accordance with DE-C-24 06 006.
  • the thermodynamic actuator “B” comprises the same or a different number of open spring elements arranged evenly distributed over the circumference 49 of the type mentioned. The latter are thus connected to a compressed gas source, namely the compressed air source 34 and a pressure generator 50 to be described in more detail, via a compressed air line 51, 52 or 51, 53.
  • the spring elements 48, 49 and their arrangement within the Frame 44 and their assignment to the carrier flange 46 will now be described in more detail with reference to FIG. 2:
  • Both the closed spring elements 48 and the open spring elements 49 are supported on the one hand on the cross-divided frame 44 and on the other hand on the flange 46 arranged in between, to which the plug 15 or its plug rod 47 is connected (screw nuts 54).
  • the carrier flange 46, together with the plug rod 47 or plug 15, is arranged such that it can move within the frame 44, in the longitudinal direction of the plug 15. The distance is in each case limited by the closed spring elements 48 on the one hand and open spring elements 49 on the other hand.
  • the frame 44 is cross-divided. The division level is identified in FIG. 2 by reference number 55.
  • the spring elements 48, 49 are each equally up builds only with the difference that the spring elements 49 defining the actuator "B" have an open compressed air chamber, as will be explained in more detail below. Otherwise, the spring elements 48, 49 each comprise a jacket tube 56, which is closed at the end to form a cylindrical chamber. A free-standing piston 57 is provided in the interior of each spring element, which piston is offset to form a ring-shaped collar on a free end 59 which has a smaller diameter and comprises a support surface 58. This free end is axially guided in a bore 60 of the respectively assigned end closure 61 of the casing tube 56.
  • the piston is sealed in that the central region of the end closure 61 is tightly and firmly connected to one end of a metal bellows 62, the other end of which is also pressure-tight and gas-tightly connected to the piston 57.
  • the closed version namely the spring elements 48
  • the space between the jacket tube 56 and the metal bellows 62 and the piston 57 and the upper end closure 65 has been filled with a pressurized inert gas via a filling opening 64 closed by a closure 63 , the pressure of which affects the piston and presses the free end 59 of the piston 57 as far as possible against the collar 66 through the bore 60.
  • the filling opening 64 is provided with a connection 67 to the compressed air line 51 mentioned above.
  • the spring elements 48, 49 are each positioned within receiving bores 68.
  • the positioning in relation to the carrier flange 46 takes place by means of ring recesses 69, 102 arranged on the carrier flange 46, into which the free ends 59 of the spring elements 48, 49 protrude.
  • the spring elements 48, 49 are mounted according to FIG. 2 so that their free ends 59 each act on the carrier flange 46 facing one another.
  • the plug 15 is pressed against the opening edge 29 of the bottom opening 14 under a predetermined contact pressure or pre-pressure. This defines the so-called zero position of the plug 15.
  • Position "II" in FIG. 4 has been reached.
  • liquid steel 13 is introduced into the distributor trough 10 (see dash-dotted line 70 in FIG. 4), which results in a corresponding temperature increase in the area of the thermodynamic precision drive head 43 (see temperature line 71 in FIG. 4). Due to this temperature increase, the closed spring elements 48 expand, whereby the contact pressure of the stopper 15 is increased accordingly.
  • the increase in this contact pressure is shown in FIG. 4 by the corresponding pressure increase in the closed spring elements 48 (see pressure line 72). Due to the unavoidable length expansion of the plug 15, there is an additional pressure increase, which is indicated in FIG. 4 by the pressure line 73.
  • a reduction in pressure or a corresponding reduction in the contact pressure of the stopper 15 takes place due to the driving force 74 of the stopper and the unavoidable wear on the sealing part after a certain operating time.
  • FIG. 4 shows very clearly what security the closed spring elements 48 offer in the event of failure of the plug control via the open spring elements 49.
  • the closed spring elements 48 attempt to bring the plug 15 into the closed position in a correspondingly increasing manner as the ambient temperature rises.
  • the closed spring elements 48 also have the advantage that the pressure of the plug 15 into the sealing zone can be softer in manual operation by means of the lever 25, because damping is ensured by the spring elements 48.
  • the upward and downward movement of the stopper 15 then takes place exclusively by corresponding pressurization of the open spring elements 49 with the fixing device 30 fixed.
  • the upward and downward movement of the stopper 15 takes place in each case against the action of the closed spring elements 48.
  • the open spring elements 49 can either together or individually, i. H. in different numbers, can be controlled, depending on the specified operating conditions and construction parameters.
  • a seal 75 is arranged between each of these and the frame 44, in order to ensure that the open spring elements 49 are not subjected to compressed air.
  • the compressed air source 34 which is preferably under a pressure of approximately 6 bar, ensures the compressed air supply for the open spring elements 49, the base pressure of approximately 6 bar mentioned being ensured by a pressure relief valve 76 arranged in the branch line 52.
  • a check valve 78 which only opens in the direction from the compressed air source 34 to the open spring elements 49.
  • the compressed air source 34 also supplies the above-mentioned locking device 30.
  • the pressure generator 50 is of special construction in the embodiment shown in FIG. 1. It comprises a closed cylinder 79 with a piston 80 which can be moved back and forth within the cylinder and divides the cylinder 79 into two cylinder spaces 81, 82. These two cylinder spaces 81, 82 are fluidly connected to one another, specifically through fluid passages 83 arranged in the piston.
  • the lower cylinder chamber 82 in FIG. 1 is provided with a connection to a hydraulic line 84, which connects the cylinder chamber 82 mentioned with a pressure proportional valve 85 of a conventional type.
  • the pressure of the hydraulic fluid 86 in the cylinder 79 can be regulated quickly and precisely by means of the pressure proportional valve 85.
  • the pressure proportional valve 85 is of a conventional type and therefore need not be described in more detail here.
  • the cylinder chamber 81 is through the wall of the cylinder 79 and the piston 80 on the one hand and a centrally arranged metal bellows 87 on the other hand.
  • the metal bellows 87 is arranged coaxially inside the cylinder 79 and is tightly and firmly connected to the piston 80 on the one hand and the opposite end wall of the cylinder 79 on the other hand.
  • the space 88 enclosed by the metal bellows 87 is connected to the compressed air line 51 via the line 53.
  • the hydraulic pressure predetermined by the pressure proportional valve 85 is thus transmitted in the pressure generator 50 directly to the gas or air side drive part.
  • pressure generator 50 should also be designed as a hydropneumatic transform unit in this case.
  • the piston 80 is also assigned a displacement sensor 89, the signals of which serve as feedback and control signals (signal line 90) for the pressure proportional valve 85 and on the other hand as control signals (signal line 91) for the detection of leaks on the gas-side drive part.
  • the signals of the displacement sensor 89 are passed to a signal processor 92 via the signal line 91.
  • the signals of the displacement sensor 89 correspond to a pressure specified by the pressure proportional valve 85. This pressure should also prevail in the compressed air line 51 leading to the open spring elements 49.
  • the air pressure is tapped in the compressed air line 51 leading to the open spring elements 49 via a pressure signal line 93.
  • a target / actual pressure comparison is then carried out in the signal processor 92. If it follows that the actual pressure is significantly lower than the target pressure, one must assume that there is an impermissible leak on the compressed air side of the system.
  • thermocouples 94 in the area of the closed spring elements 48 is of great importance for the movement control of the plug 15.
  • the pressure in the closing direction of the plug 15 which is exerted by the closed spring elements 48 can be calculated from the temperature measured there.
  • the stopper movement is regulated against this pressure, the corresponding counterpressure having to be built up in the open spring elements 49 or in the compressed air line 51 leading to these. Accordingly, a constant comparison between the calculated closing pressure of the closed spring elements 48 and the signal pressure in the open spring elements or in the compressed air line 51 leading to them is required in the signal processor.
  • the temperature values of the thermocouple 94 reach the signal processor 92 via a signal line 95, where they are processed in the manner described.
  • the actual and target bath level values are also entered in the signal processor 92, with the interposition of a process controller 96, which ultimately also specifies the manipulated variable 97 for the pressure proportional valve 85.
  • the pressure proportional valve 85 is connected to the pump “P” via a hydraulic line 156, to the tank “T” to a hydraulic line 98.
  • thermodynamic elements 48, 49 are checked without manual intervention or without removal from the drive head 43.
  • the signal processor 92 can automatically check the exact functionality of all thermodynamic elements 48, 49.
  • Characteristic of every stopper regulation is the extremely high control gain factor. According to the present invention, this high amplification factor is elegantly damped by the transform pressure generator 50, which at the same time separates the oil-hydraulic pressure control from the gas or compressed air side drive part.
  • FIG. 3 A modified embodiment of the drive head 43 is shown in FIG. 3, all of the parts of the same already described having the same reference numerals.
  • the drive head 43 according to FIG. 3 differs from that according to FIGS. 1 and 2 in that the frame 44 is divided lengthways. It can be opened in the manner of a hinge (hinge axis 99) (arrows 100) with the release of the plug rod 47 (not shown in FIG. 3).
  • the plug closing element "A" comprises three spring elements 48 which are arranged in a plane perpendicular to the longitudinal axis of the plug around the same at approximately the same distance from one another, each corresponding in the form of closed gas pressure springs DE-C-24 06 006 can be formed.
  • the stopper actuator "B” comprises the same number of spring elements 49 of the type mentioned, evenly distributed over the circumference, but open, i. H. with a connection 67 to a compressed gas source, with which the connections 67 can be connected via a compressed air line 51 in a manner to be described in more detail below.
  • the plug drive head 43 comprises a housing ring 152, the upper end face by a cover plate 151 and the lower end face by a bottom plate te 153 is completed.
  • a support element 102 is fastened, namely between two fastening nuts 103 and 104, which are screwed onto a threaded section 105 at the free upper end of the plug rod 47 are.
  • the support element 102 consists of a central sleeve 106 and three support arms 107 arranged at the lower end thereof and three support arms 108 formed at the upper end thereof, each extending in a plane perpendicular to the plug or sleeve longitudinal axis and having the same angular distance from one another, the upper and lower support arms are each arranged in a gap to one another, as can be seen very well from a comparison between FIGS. 6 and 7.
  • the plug actuators "B” or pneumatically actuated spring elements 49 are arranged, while the spring elements 48 are arranged between the lower support arms 107 and the cover plate 151.
  • the stopper closing elements 48 and stopper adjusting members 49 are each arranged in a star shape and nested within the frame or housing 44 of the drive head 43, as a result of which a minimal overall height is obtained despite the opposite direction of action of the elements mentioned.
  • the plug actuators 49 are designed in accordance with the gas pressure springs 48 only with the difference that they have a connection 67 to a compressed air source, so that they are axially expandable according to the applied pressure against the action of the closed gas pressure springs 48 with a corresponding axial Movement of the plug 15. Accordingly, the dependence on the applied pressure of the plug 15 in the direction of the double arrow 45 can be moved up and down.
  • the distance is limited in each case by the closed spring elements 48 on the one hand and open spring elements 49 on the other hand.
  • An axial guide for the radially extending support arms 107, 108 is also provided within the frame or housing 44 of the drive head 43.
  • the support arms 107, 108 each have at their front ends an axially extending projection 109 and 110, which protrude into corresponding axial grooves 111, 112 on the inside of the housing ring 152.
  • the peripheral surface and the underside of the frame or housing 44 of the drive head 43 is protected from excessive heat or temperature by an insulating layer 113.
  • a water jacket 114 is formed within the housing ring 152, through which cooling water is passed during operation.
  • the cooling water is supplied according to FIG. 5 through a cooling water line 115.
  • the cooling water is discharged through a line 116.
  • the stopper closing elements and stopper actuators are thus protected against overheating. This measure becomes particularly important if disc springs are used for the stopper closing elements, as will be explained in more detail with reference to FIGS. 8 and 9.
  • the housing ring 152 and the cover plate 151 and base plate 153 are held together by screws, in particular expansion screws 117 (see FIGS. 6 and 7).
  • thermocouples 94 Of great importance for the movement control of the stopper 15 is the arrangement of one or more thermocouples 94 in the area of the closed spring elements 48. From the temperature measured there, the pressure exerted by the closed spring elements 48 in the closing direction of the stopper 15 can be calculated. The stopper movement is regulated against this pressure, the corresponding counterpressure in the open spring elements 49 or in the latter leading compressed air line 51 must be built. The temperature values of the thermocouple 94 reach a signal processor 92 via a signal line 95, where they can be processed in a manner to be described in more detail with reference to FIG. 10.
  • the elements "A” and “B” are arranged one above the other within the frame or housing 44 of the plug drive head 43 connected to the flag 22.
  • a flange 46 is arranged in the direction of the upward and downward movement (double arrow 45) of the stopper 15 or the stopper rod 47 relative to the frame or housing 44, on which the stopper 15 or the Plug rod 47 is connected.
  • the element “A” is thus supported on the top on the frame or housing 44 or on the housing cover 151 on the one hand and below on the support flange 46 on the other hand, while the plug actuator “B” arranged below it is supported on the top of the support flange 46 on the one hand and below on the frame or housing 44 or on the bottom plate 153 thereof is supported on the other hand.
  • the plug-closing element "A" is formed by a plurality of disk spring assemblies 118 which are distributed uniformly over the circumference, and in the embodiment according to FIG. 9 by disk springs 119 which extend over the entire circumference of the carrier flange 46, which are each made of high temperature resistant spring steel, so that they have an essentially unchanged spring hardness over the entire temperature range which is effective on the drive head 43.
  • the elements 49 defining the stopper actuator "B" each include - as already described above in connection with the embodiment according to FIG. 2 - a jacket tube 56, which is completed at the end to form a cylindrical chamber.
  • a free-standing piston 57 is provided in the interior of each element 49, which piston is offset to form a ring-shaped collar on a free end 59 which has a smaller diameter and has a support surface 58.
  • This free end is axially guided in a bore 60 of the respectively assigned end closure 61 of the casing tube 56.
  • the piston is sealed in that the central region of the front end 61 is tightly and firmly connected to one end of the bellows 62, the other end of which is also pressure-tight and gas-tight connected to the piston 57.
  • a closed embodiment namely the spring elements 48 according to FIGS. 5 to 7
  • the space present between the casing tube 56 and the metal bellows 62 and the piston 57 and the end closure 65 is via a filling opening 64 closed by a closure with a pressure standing inert gas has been filled, the pressure of which affects the piston and presses the free end 59 of the piston 57 up to the stop on the collar 66 through the bore 60.
  • the filling opening 64 is provided with a connection 67 to the compressed air line 51 already mentioned.
  • the elements 49 are each positioned within receiving bores 68.
  • the positioning relative to the carrier flange 46 takes place through an annular recess 69 arranged on the carrier flange 46, into which the free ends 59 of the elements 49 protrude.
  • the frame or the housing 44 is cross-divided in the embodiment according to FIGS. 8 and 9, the transverse division plane being identified by the reference number 55.
  • the carrier flange 46 is similar to the support element 102 according to FIG. 5 between two nuts 103 and 104 at the top Free end of the plug rod 47 attached, the nuts 103, 104 can be screwed onto a threaded portion 105 of the plug rod 47.
  • a further embodiment for a stopper control device is to be described with reference to FIG. 10, the stopper stroke in this embodiment being controlled exclusively by the actuators 49 on the one hand and closing elements 48 on the other hand.
  • the flag carrying the stopper 15 is thus - in contrast to the embodiment according to FIG. 1 - immovably mounted vertically on the distribution channel 10.
  • the compressed air line 51 leading to the open spring elements 49, which define the plug actuator "B" is connected on the one hand via a branch line 52 to a constant compressed air source 34 and on the other hand via a branch line 53 to a pressure generator 50.
  • the compressed air source 34 which is preferably under a pressure of approximately 6 bar, ensures the compressed air supply for the open spring elements 49, the base pressure of approximately 6 bar mentioned being ensured by a pressure relief valve 76 arranged in the branch line 52.
  • a check valve 78 which only opens in the direction from the compressed air source 34 to the open spring elements 49.
  • the pressure generator 50 in the embodiment shown in FIG. 10 is constructed in the manner described with reference to FIG. 1. With regard to the mode of operation in connection with the signal processor 92 and the thermocouples 94, reference is likewise made to the corresponding description of FIG. 1.
  • 11 and 12 is a particularly simple and Functionally reliable embodiment of a plug drive head 43 designed according to the invention is explained in more detail.
  • This is in turn attached to the free end of the flag 22 and comprises a pot-like frame or housing 44 and a support plate 120 arranged below the housing base 153, which is also rigidly connected to the flag 22.
  • the stopper actuator "B” is formed by pneumatically actuated spring elements 49 of the type already described, with the difference that it is particularly "long-stroke” spring elements which are described in more detail below with reference to FIG. 13. These spring elements 49 are supported on the one hand on the support plate 120 and on the other hand on a mass 121 which is firmly connected to the stopper rod 47 and which defines the stopper closing element "A '".
  • the weight of the mass 121 is approximately 50 to 80 kg; ultimately it depends on the plug closing force required.
  • the plug 15 can be moved out of the plug closed position against the action of this weight.
  • the spring elements 49 are supported on the mass 121 in vertical blind bores 122 in the stopper closing mass 121.
  • the mass 121 is fastened to the free upper end of the plug rod 47 by means of the nuts 103, 104.
  • the compressed air supply to the spring elements 49 takes place via the already mentioned compressed air line 51 and the compressed air connection 67 within the drive head 43.
  • the frame or housing 44 is fastened to the lug 22 by means of fastening screws 167.
  • the long-stroke spring elements 49 according to FIGS. 11 and 12 will now be explained in more detail with reference to FIG. 13.
  • These are open gas pressure springs, which are characterized by an upper support plate 171, lower support plate 170, upper metal bellows guide 172, one connected to the upper support plate outer housing 173, an inner housing 175 connected to the lower support plate 170, a metal bellows 174 connected to the upper metal bellows guide 172 on the one hand and the lower support plate 170 on the other hand, and a stroke limiting ring 154 arranged at the lower free end of the outer housing 173, which with an inner Housing 173 arranged radial projection 123 cooperates.
  • the upper bellows guide 172 is centered by a holding pin 155 arranged on the inside of the upper support plate 171, namely welded on.
  • Compressed air can be introduced via a connection 67 provided on the lower support plate 170 into the space delimited by the metal bellows on the one hand and the upper bellows guide 172 and lower support plate 170 on the other hand, the above-described compressed air line 51 being connected to the connection 67.
  • the compressed air is introduced in the installed state against the effect of the stopper closing elements "A '" described above.
  • the gas pressure spring 49 which is open via the compressed air connection 67, allows a stroke of up to 100 mm, so that a vertical displacement of the flag 22 is not necessary when it is used.
  • the zero position of the stopper 15 can be set solely by applying compressed air to the open gas pressure springs 49.
  • the aforementioned stroke distance is limited on the one hand by the radial projection 123 formed on the inner housing 175 and the stroke limiting ring 154 arranged on the outer housing, namely welded on, and on the other hand by the radial projection 123 already mentioned and an annular step formed on the inside of the outer housing 73 at an axial distance from the stroke limiting ring 154 124.
  • the maximum stroke distance of the open spring element 49 is identified by the reference number 157.
  • a line 128 branches off to a double check valve, which is assigned on the one hand to the pressure increase unit 126 and on the other hand to a control pressure source 130, the compressed air line 51 already mentioned branching off from the connecting line between the double check valve 129 and the control pressure source 130.
  • the pressure increase unit 126 comprises a differential piston 131, a low-pressure cylinder chamber 132 being assigned to the larger-diameter part of the piston 131 and a high-pressure cylinder chamber 133 to the smaller-diameter part of the piston 131.
  • the low-pressure line 127 is connected to the low-pressure cylinder chamber 132.
  • the high-pressure cylinder chamber 133 is assigned the double check valve 129 in such a way that in the connection between the branch line 128 and the high-pressure cylinder chamber 133 a check valve 134 which opens only in the direction of the latter and in the connection between the high-pressure cylinder chamber 133 and the control pressure source 130 or the compressed air line 51 leading to the plug actuator "B", a check valve 135 which only opens in the direction of the latter is arranged.
  • the two check valves 134, 135 are combined to form a unit 129 such that the fluid connection between the two check valves 134 and 135 is connected to the high-pressure cylinder chamber 133 via a spur line 136.
  • the pressure increase unit 126 works in conjunction with the described double check valve 129 in the manner of an air pump, with which the control pressure source 130 can be charged such that the control pressure z. B. is 50 bar.
  • the pressure increase unit together with double check valve 129 are set so that the control pressure in the control pressure source 130 is kept approximately constant. This means that the control pressure source is "reloaded” immediately in the event of any leakage.
  • the operating pressure of 6 bar prevails in the low-pressure cylinder chamber 132, while a pressure of approximately 50 bar must be built up in the high-pressure cylinder chamber 133.
  • the cylinder chamber 133 receives air supply via the branch line 128 and the check valve 134.
  • a servo valve 137 is also arranged in the compressed air line 51 and corresponds to an electronics unit 138.
  • This electronics unit consists of a current-voltage converter 139, PID controller 140 and measuring amplifier 141.
  • the setpoint signal 142 to be provided to the electronics unit 138 is accordingly converted into a proportional voltage signal.
  • the actual value of the pressure prevailing in line 51 is also taken into account in PID controller 140. This is determined by a pressure sensor 143 connected downstream of the servo valve 137. The actual value pressure signal then reaches the PID controller 140 via the measured value amplifier 141. This is followed by a voltage-current converter 144, by means of whose signals the servo valve 137 is connected.
  • the setpoint signal 142 to be provided is provided by a Signal processor 145 upstream of electronics unit 138 generates and delivers, taking into account bath level setpoint 146, which is provided by process controller 96 (not shown in FIG. 14), actual bath level 147 and a plug distance signal 148.
  • the latter becomes supplied by a temperature-insensitive displacement sensor assigned to the plug 15 or the plug rod 47, in particular a capacitive displacement sensor.
  • a manual control signal can also be applied to the setpoint signal 142. Likewise, it is possible to switch on the signal "stopper: emergency open” or stopper: emergency close. This hookup takes place via an integrator 149 assigned to the signal line 142.
  • a mains transformer 150 is also connected between the electronics unit 138 and the power network.
  • the open spring elements 49 of the plug actuator "B" can also be acted upon hydraulically.
  • the drive head 43 must be cooled in order to avoid the formation of steam within the hydraulic lines. Circulation cooling of the hydraulic medium is also conceivable.
  • the elements 49 are preferably piston-cylinder units which can be acted upon on one side.
  • a so-called hydro-bubble accumulator can also be used, the hydraulic chamber of which is connected to the hydraulic system, ie line 84, and the pneumatic chamber (gas bubble) of which is connected to the pneumatic system, ie line 53, 51.
  • a flow meter is then preferably arranged in the hydraulic line 84, which replaces the displacement sensor 89 in the embodiment according to FIG. 10.
  • a constant mass can also serve as a stopper restoring element.
  • Mechanical spring elements are also conceivable.
  • the stopper restoring element can be designed as described above with reference to the other embodiments. Accordingly, it is also possible to make the bellows element 48 open; in this case a fluid connection is provided between the two elements 48, 49 in which a 5/3-way proportional valve is arranged. In this respect, there are only a few limits to the design.
  • the increased effective area in the area of the actuator 49 also has the advantage that it is possible to work with a lower control pressure. Furthermore, the actuating force can be distributed uniformly over the circumference of the drive head 43, so that other compensating means, such as complex guides or the like, can be omitted.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Toxicology (AREA)
  • Continuous Casting (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
EP88109386A 1987-06-22 1988-06-13 Procédé et dispositif pour le remplissage automatique d'une lingotière de coulée continue Withdrawn EP0296443A3 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19873720586 DE3720586A1 (de) 1987-06-22 1987-06-22 Verfahren und vorrichtung zum automatischen fuellen einer stranggiesskokille
DE3720586 1987-06-22
DE19873738489 DE3738489A1 (de) 1987-11-12 1987-11-12 Vorrichtung zum automatischen fuellen einer stranggiesskokille
DE3738489 1987-11-12

Publications (2)

Publication Number Publication Date
EP0296443A2 true EP0296443A2 (fr) 1988-12-28
EP0296443A3 EP0296443A3 (fr) 1989-11-08

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EP88109386A Withdrawn EP0296443A3 (fr) 1987-06-22 1988-06-13 Procédé et dispositif pour le remplissage automatique d'une lingotière de coulée continue

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US (1) US4905755A (fr)
EP (1) EP0296443A3 (fr)
JP (1) JPS6422458A (fr)
KR (1) KR890000189A (fr)
IL (1) IL86768A0 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO172410C (no) * 1991-04-04 1993-07-14 Covent As Ventil for stroemmende medium i vaeskeform
CH689728A5 (de) * 1995-03-28 1999-09-30 Concast Standard Ag Vorrichtung zum Regeln eines Zuflusses einer Metallschmelze mittels eines Stopfens.
GB9815535D0 (en) * 1998-07-17 1998-09-16 Kvaerner Metals Cont Casting Improvements in and relating to handling molten materials
ITMI20042301A1 (it) * 2004-11-30 2005-02-28 Danieli Off Mecc Dispositivo di comando di un'asta-tampone
US8210402B2 (en) * 2009-02-09 2012-07-03 Ajf, Inc. Slag control shape device with L-shape loading bracket

Citations (4)

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DE2319004A1 (de) * 1973-04-14 1974-10-31 Bbc Brown Boveri & Cie Stopfenbetaetigungseinrichtung fuer giesspfanne
DE2406006B2 (de) * 1974-02-08 1975-12-11 Zimmermann & Jansen Gmbh, 5160 Dueren Federelement für einen Schieberverschluß für Gießpfannen für flüssige Metalle, insbesondere Stahl
DE2351816B2 (de) * 1972-10-17 1977-03-03 Concast AG, Zürich (Schweiz); Schloemann-Siemag AG, 4000 Düsseldorf Verfahren und einrichtung zum regeln der fuellstandshoehe von schmelze in kokillen von stranggiessanlagen
EP0032442B1 (fr) * 1980-01-10 1984-03-21 Olin Corporation Dispositif et procédé de coulée électromagnétique

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DE1945276A1 (de) * 1969-09-06 1971-03-11 Kraft Industrieofenbau Gmbh Verschluss
DE2637548C3 (de) * 1976-08-18 1979-02-08 Mannesmann Ag, 4000 Duesseldorf Vorrichtung zur regelbaren Verstellung eines Stopfens eines Zwischengefäßes in einer Stranggießanlage
FR2429632A1 (fr) * 1978-06-28 1980-01-25 Est Aciers Fins Dispositif de reglage du debit d'un bouchon d'un recipient de distribution dans une installation de coulee continue, par asservissement au niveau du bain de metal d'une lingotiere receptrice
JPS55141366A (en) * 1979-04-24 1980-11-05 Sumitomo Metal Ind Ltd Preventing method of tundish nozzle clogging for continuous casting and its device
US4473104A (en) * 1980-01-10 1984-09-25 Olin Corporation Electromagnetic casting process and apparatus
JPS5853361A (ja) * 1981-09-24 1983-03-29 Nippon Kokan Kk <Nkk> 連続鋳造法
JPS62192246A (ja) * 1986-02-19 1987-08-22 Fuji Electric Co Ltd 連続鋳造設備のモールド湯面レベル制御装置
AT386777B (de) * 1986-06-03 1988-10-10 Stangl Kurt Dipl Ing Manipulator zum ansetzen eines giessrohres an den ausgussschieber einer giesspfanne

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2351816B2 (de) * 1972-10-17 1977-03-03 Concast AG, Zürich (Schweiz); Schloemann-Siemag AG, 4000 Düsseldorf Verfahren und einrichtung zum regeln der fuellstandshoehe von schmelze in kokillen von stranggiessanlagen
DE2319004A1 (de) * 1973-04-14 1974-10-31 Bbc Brown Boveri & Cie Stopfenbetaetigungseinrichtung fuer giesspfanne
DE2406006B2 (de) * 1974-02-08 1975-12-11 Zimmermann & Jansen Gmbh, 5160 Dueren Federelement für einen Schieberverschluß für Gießpfannen für flüssige Metalle, insbesondere Stahl
EP0032442B1 (fr) * 1980-01-10 1984-03-21 Olin Corporation Dispositif et procédé de coulée électromagnétique

Also Published As

Publication number Publication date
EP0296443A3 (fr) 1989-11-08
US4905755A (en) 1990-03-06
IL86768A0 (en) 1988-11-30
JPS6422458A (en) 1989-01-25
KR890000189A (ko) 1989-03-13

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