DE102018216285A1 - Slag stopper - Google Patents

Abstract

The invention relates to a slag stopper (1) for closing a tap hole (2) of a metallurgical vessel (3) for separating a liquid metal and a slag, the slag stopper (1) having an arm (4) which can be pivoted about an axis (a), at one end there is a closure body (5) for closing the tap hole (2) of the metallurgical vessel (3) and the arm (4) is connected to a drive (6) which causes a pivoting movement about the axis (a) can. In order to ensure low-maintenance and failure-insensitive operation for such a slag stopper, the invention provides that the drive (6) comprises: a shaft (7) which is fixedly connected to the arm (4) and a shaft which is non-rotatable with the shaft (7) connected gear (8), a linear actuator (9) which can cause a linear displacement movement (b, b) of at least one actuator component (10, 11), the at least one actuator component (10, 11) being a rack (12 , 13) which is in engagement with the gear wheel (8).

Description

The invention relates to a slag stopper for closing a tap hole of a metallurgical vessel for separating a liquid metal and a slag, the slag stopper having an arm pivotable about an axis, at one end of which a closure body for closing the tap hole of the metallurgical vessel is arranged, and wherein the Arm is connected to a drive that can cause a pivoting movement about the axis.

A generic slag stopper is used in particular in steelworks to separate liquid metal and slag by closing the tap opening of a metallurgical vessel. In this way, an arm with a closure piece is pivoted to the opening of the metallurgical vessel by means of a rotary movement.

The structure and function of such a slag stopper and the procedural background are in the DE 26 39 712 C2 disclosed or described. The actual function of the slag stopper is only used for a relatively short period of time in the metallurgical process, the swivel arm being guided into the working position for the tap opening. The rest of the time, the swivel arm remains in a position in which the metallurgical process can take place without problems. In this dwell position, the arm should be protected against damage from collisions with neighboring trades or falling fabrics. In order to be able to reach the two positions of the swivel arm, swivel angles of up to 180 ° are necessary.

A disadvantage of the previously known solution is that a drive is set in order to reach the required end position positions of the swivel arm (working and dwell position), in which a first shaft is first rotated by a linear drive. Since the components (linear drive including cam for rotating the shaft) can only rotate the swivel arm by approx. 90 °, a mechanical shaft (in the form of spur gear teeth) drives a second shaft so that it achieves a larger swivel angle can be; the swivel arm is attached to this second shaft.

Due to high thermal loads from the converter process (radiant heat of the melt, which has approx. 1650 ° C and converter jacket outside temperature up to approx. 400 ° C) and the contaminated environment, this design is prone to failure and maintenance-intensive. The spur gear teeth (gear ratio) must be greased or oiled to avoid wear and clamping. Due to the dust typically present in the steel mill, which can penetrate even the smallest opening, the mechanical translation is clogged by dust accumulation on the oiled surfaces. The same applies to storage locations. Due to the fact that the components are susceptible to failure, failures often occur in practice. Due to the relatively high number of components that are prone to failure in steel mill operations, the probability of failure is relatively high. The converter usually runs for about four months before it comes to a standstill and is cooled down again. All maintenance work on the hot converter (in the event of a failure) is a safety risk for the personnel.

Similar and other solutions regarding a slag stopper are in the DE 100 64 048 B4 , in the EP 1 054 067 B1 , in the KR 20 0151310 Y1 and in the KR 2003 0006148 A described.

The invention is therefore based on the object of further developing a generic slag stopper in such a way that low-maintenance and trouble-free operation can be ensured. A simple construction should be possible, so that it can be implemented with a few components, which should also reduce the manufacturing costs.

• - eine Welle, die mit dem Arm fest verbunden ist,
• - ein mit der Welle drehfest verbundenes Zahnrad und
• - einen Linearaktuator, der eine lineare Verschiebebewegung mindestens eines Aktuator-Bauteils veranlassen kann,

wobei das mindestens eine Aktuator-Bauteil eine Zahnstange aufweist, die mit dem Zahnrad in Eingriff steht.The solution to this problem by the invention is characterized in that the drive comprises:

• - a shaft that is firmly connected to the arm,
• - A gear connected to the shaft in a rotationally fixed manner and
• a linear actuator which can cause a linear displacement movement of at least one actuator component,

wherein the at least one actuator component has a rack that is in engagement with the gear.

The linear actuator preferably comprises two actuator components, the two actuator components being able to move linearly in opposite directions to one another and the two actuator components each having a rack.

Limiting means are preferably provided with which the pivoting movement of the arm can be limited. Accordingly, a limitation and the possibility of fine adjustment of defined end position positions of the working and rest positions are provided, which can be done, for example, by a centrally rotating cam in a limitation module.

Furthermore, there is preferably a single linear actuator with which the arm can be pivoted.

The linear actuator can be designed as a pneumatic piston-cylinder unit. However, other solutions are also possible.

The shaft is preferably supported by bearings that have integrated solid lubricant. After this, maintenance-free and fail-safe execution of the bearing points can be achieved.

The drive can be arranged in a housing, the housing being fastened to a surrounding component via spacers, in particular in the form of spacers. This advantageously realizes a thermal decoupling of the drive from external temperature fluctuations by means of an outer protective housing, which is favored by the use of said spacers with a minimized contact area between the drive and the housing and the use of materials with low thermal conductivity.

The housing is preferably provided with flat insulation elements.

The housing can also be provided with cooling elements, in particular in the form of cooling ring lines.

Furthermore, the inner chamber of the drive housing can be tempered to the operating temperature of the rotary actuator by means of insulation plates and a flow-oriented and optimized cooling air duct through a cooling ring line.

The drive can be connected to an energy store, in particular a pressure store. The use of a pressure accumulator for the actuation of the drive ensures independent operation of the drive in the event of fluctuations in the power grid; this also provides security against failure.

Advantageously, large swivel angle ranges of up to 180 ° of the slag stopper arm can now be driven directly onto the drive shaft without any additional components. Thus, the arm is swiveled by up to 180 ° with only a single swivel drive or rotary drive and a single shaft, without the need for further components for increasing or reducing the rotary movement.

The drive can be actuated by various energy sources (spring force, compressed air or gas pressure) with a double-acting drive unit surface, which enables faster reaction times and high forces or moments; at the same time, there is a compact design.

The slag stopper can get a compact and mass-minimized housing (outer protective housing) due to the small number of components. There are numerous placement options around the tapping piece of the converter vessel.

With the proposed solution, all required pivot positions of the arm can be reached without any problems, i. H. the end positions can be approached without any problems. At the same time, the number of components required is reduced. The latter increases ease of maintenance and manufacturing costs. The operational safety of the system is also improved since the hot area requires less maintenance.

A device for assembling and disassembling the slag stopper on the converter vessel is also preferably used.

• 1 in perspektivischer Ansicht einen Schlackenstopper,
• 2 die Vorderansicht eines Antriebs des Schlackenstopper (oben) sowie den Schnitt C-C durch den Antrieb (unten), wobei der Ruhezustand (geöffnetes Abstichloch) dargestellt ist,
• 3 in der Darstellung gemäß 2 die Arbeitsposition des Schlackenstoppers (geschlossenes Abstichloch),
• 4 in perspektivischer Ansicht eine Montagevorrichtung für den Schlackenstopper und
• 5 in perspektivischer Ansicht einen Teil eines metallurgischen Gefäßes, an dem eine Montage- und Instandhaltungsbühne zur Montage des Schlackenstoppers angeordnet ist.

In the drawing, an embodiment of the invention is shown. Show it:

• 1 a perspective view of a slag stopper,
• 2nd the front view of a drive of the slag stopper (top) and the section CC through the drive (bottom), showing the idle state (open tap hole),
• 3rd in the representation according to 2nd the working position of the slag stopper (closed tap hole),
• 4th a perspective view of a mounting device for the slag stopper and
• 5 a perspective view of a part of a metallurgical vessel on which an assembly and maintenance platform for assembling the slag stopper is arranged.

In 1 is a slag stopper 1 to see with a tap hole 2nd (see 5 ) of a metallurgical vessel 3rd can be locked. For this, the slag stopper 1 an arm 4th on that around an axis a is pivotally arranged. At the radially outer end of the arm 4th is a closure body 5 arranged to cooperate with the tap hole 2nd is trained.

There is a drive for executing the pivoting movement 6 provided, which is designed in the exemplary embodiment as a pneumatically actuated element.

The drive has 6 a shaft whose axis is the pivot axis a corresponds. The arm 4th is on the wave 7 firmly arranged. As from the two representations 2nd and 3rd emerges, includes the drive 6 a linear actuator 9 , which in the exemplary embodiment has two actuator components 10th and 11 includes, each a linear displacement movement b ₁ respectively. b ₂ can perform (see each of the lower figures in the 2nd and 3rd ) if the linear actuator 9 is operated. On the two actuator components 10th and 11 are each racks 12th and 13 arranged or incorporated into said parts. The two racks 12th and 13 comb with a gear 8th which is rotatably attached to the shaft 7 is arranged.

Now the two actuator components 10th and 11 by inputting compressive force in the direction of the linear displacement movement b ₁ , b ₂ the wave is shifted 7 around the axis a rotated, causing the arm 4th is pivoted accordingly.

The pivoting movement is in both directions of rotation by limiting means 14 and 15 limited, different configurations being possible for said limiting means.

In 1 can be seen that the wave 7 through camp 16 is stored. The drive is also located 6 in one housing 17th which has spacers 18th is connected to surrounding components; the spacers are preferably made of a material with low thermal conductivity, so that the drive is thermally decoupled from the surrounding components.

Insulation elements are used to further reduce the thermal load on the drive 19th (Thermal insulation panels) provided with which the housing 17th is lined. Cooling elements 20th in the form of ring cooling lines serve the drive 6 to cool.

4th shows a mounting device 21 for the in 5 Assembly or disassembly of the slag stopper shown 1 on the metallurgical vessel 3rd or the situation when installing the slag stopper 1 .

In the 4th shown assembly device 21 allows the use of standard steelworks equipment in the form of a forklift with forks during assembly or disassembly, whereby the assembly device 21 Fork mounts 22 for the forks of the forklift.

The mounting device 21 has two reception centers 23 into which the pins 24th can be hung on the side of the slag stopper 1 are arranged (see 1 ). Furthermore, the mounting device 21 Positioning supports 25th on which is a defined system of the slag stopper 1 on the device 21 to ensure.

In 5 is an assembly and maintenance platform 26 to see the safe accessibility to the slag stopper 1 allowed, by bridging the opening between the converter vessel 3rd and the steelworks platform 27 by laying the assembly platform 26 on the support ring 28 and the steelworks platform 27 .

Reference list

1

Slag stopper

2nd

Tap hole

3rd

metallurgical vessel

4th

poor

5

Closure body

6

drive

7

wave

8th

gear

9

Linear actuator

10th

Actuator component

11

Actuator component

12th

Rack

13

Rack

14

Limiting means

15

Limiting means

16

camp

17th

casing

18th

Spacers

19th

Insulation element

20th

Cooling element

21

Mounting device

22

Fork mounts

23

Reception center

24th

Pin code

25th

Positioning support

26

Assembly and maintenance platform

27

Steel mill platform

28

Support ring

a

axis

b ₁

linear movement

b ₂

linear movement

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 2639712 C2 [0003]
• DE 10064048 B4 [0006]
• EP 1054067 B1 [0006]
• KR 200151310 Y1 [0006]
• KR 20030006148 A [0006]

Claims (10)

Slag stopper (1) for closing a tap hole (2) of a metallurgical vessel (3) for separating a liquid metal and a slag, the slag stopper (1) having an arm (4) which can be pivoted about an axis (a), at one end thereof a closure body (5) for closing the tap hole (2) of the metallurgical vessel (3) is arranged and wherein the arm (4) is connected to a drive (6) which can cause a pivoting movement about the axis (a), characterized that the drive (6) comprises: - a shaft (7) which is fixedly connected to the arm (4), - a gear wheel (8) connected in a rotationally fixed manner to the shaft (7) and - a linear actuator (9) which can cause a linear displacement movement (b ₁ , b ₂ ) of at least one actuator component (10, 11), the at least one actuator component (10, 11) having a toothed rack (12, 13) which is connected to the toothed wheel (8 ) is engaged. Slag stopper after Claim 1 , characterized in that the linear actuator (9) comprises two actuator components (10, 11), the two actuator components (10, 11) being able to move linearly in opposite directions to one another and wherein both actuator components (10, 11) each have a rack (12, 13). Slag stopper after Claim 1 or 2nd , characterized in that limiting means (14, 15) are provided with which the pivoting movement of the arm (4) can be limited. Slag stopper according to one of the Claims 1 to 3rd , characterized in that there is a single linear actuator (9) with which the arm (4) can be pivoted. Slag stopper according to one of the Claims 1 to 4th , characterized in that the linear actuator (9) is designed as a pneumatic piston-cylinder unit. Slag stopper according to one of the Claims 1 to 5 , characterized in that the shaft (7) is supported by at least one bearing (16) which has integrated solid lubricant. Slag stopper according to one of the Claims 1 to 6 , characterized in that the drive (6) is arranged in a housing (17), the housing (17) being fastened to a surrounding component via spacers (18), in particular spacers. Slag stopper after Claim 7 , characterized in that the housing (17) is provided with flat insulation elements (19). Slag stopper after Claim 7 or 8th , characterized in that the housing (17) is provided with cooling elements (20), in particular cooling ring lines. Slag stopper according to one of the Claims 1 to 9 , characterized in that the drive (6) is connected to an energy store, in particular a pressure store.

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