KR101842950B1 - Injection nozzle adjustment device - Google Patents

Abstract

The present invention relates to an injection nozzle adjustment device (1) for positioning one or more injection nozzles (2) against a strand (3) in a strand guide of a continuous slab continuous casting machine, A displacement device 6 having a drive body 21 and a setting piston 5 for displacing the setting piston 5 in opposition to the piston 21 and a discharge nozzle 6 for holding one or more injection nozzles 2, The injection nozzle 2 is formed so as to inject coolant onto the strands 3 and the injection nozzle holder 4 is connected to the setting piston 5. It is an object of the present invention to provide a compact spray nozzle adjustment device 1 which can be reliably guided from the displacement device 6 to the injection nozzle 2 under the condition that the coolant is not used, It is on. The object is achieved by the provision of at least one telescopic pipe (7a, 7b) comprising a fixed pipe and at least one displaceable pipe for guiding the coolant to the injection nozzle holder (4), the fixed pipe comprising a drive body So that the injection nozzle 2 is unbrokenly connected to the drive body 21 and the longitudinal axes 8 of the setting piston 5 and the telescopic pipes 7a and 7b are arranged in parallel Which is achieved by the device.

Description

{INJECTION NOZZLE ADJUSTMENT DEVICE}

The present invention relates to a jet nozzle adjustment device for positioning one or more jet nozzles and a strand guide segment for guiding, supporting and cooling the strand in a strand guide of a continuous slab continuous casting machine.

More specifically, the present invention relates to a spray nozzle adjustment device for positioning one or more spray nozzles against strands in a strand guide of a continuous slab continuous casting machine,

A displacement device having a drive body and a setting piston for displacing a setting piston against a stationary drive body,

- a jet nozzle holder for holding one or more jet nozzles, the jet nozzle being formed to jet a coolant onto the strand and the jet nozzle holder being connected to a setting piston.

Devices of this type are known, for example, from EP 2 010 347 B1. Whereby the position of one or more of the injection nozzles of the strand guide segment can be adjusted against the strand and the injection nozzles are connected to the displacement setting piston through the injection nozzle holder. What is undesirable in the device, however, is that on the one hand the coolant must be guided by a hose line to a displaceable spray nozzle holder in the fixed drive of the displacement device and on the other hand the setting piston and, Due to the fact that the spray nozzle is also rotatably opposed to the displacement device, the spray nozzle holder must be guided separately. In addition, the hose line and the guide of the spray nozzle holder increase the space requirements of the spray nozzle adjustment device, so that mounting in conventional strand guide segments is complex and costly.

It is an object of the present invention to overcome the disadvantages of the prior art and to provide a particularly compact injection nozzle adjustment device of the type referred to in the introduction, wherein the coolant is supplied to the stationary system portion of the strand guide , Which can be reliably guided from the displacement device to the injection nozzle, for example; In particular, the conventional strand guide segments can be retrofitted with an injection nozzle adjusting device.

The above object is achieved by an apparatus as set forth in the introduction section,

- at least one telescoping telescopic pipe is provided, which comprises a stationary pipe and at least one displaceable pipe for guiding the coolant to the injection nozzle holder, the stationary pipe being connected to the drive body, So that the injection nozzle is connected to the driving body in an unbroken manner,

The longitudinal axes of the setting piston and the telescopic pipe are arranged in parallel,

This is accomplished by the apparatus.

By means of the device according to the invention, on the one hand, the coolant can be reliably conveyed by means of a telescopic pipe very reliably, and in particular without a hose line which requires careful control, in a stationary system part of the strand guide, On the other hand the jet nozzle holder and the jetting nozzles thereof are connected by a telescopic pipe so as not to interfere with the displacement device, in other words the jetting nozzle holder is connected to the displacement device So as not to be twisted. The telescopic pipe can in principle be formed in a single or multi-stage type. In one embodiment, in a telescopic pipe,

- a fixed pipe and a displaceable pipe, the two pipes being coaxially aligned, the displaceable pipe having a smaller diameter than the fixed pipe,

- the displaced pipe is sealed against the fixed pipe,

The displaceable pipe is displaceably formed (also referred to as a stretch shank) against a stationary pipe so that the telescopic pipe on one hand exhibits a small structural length in the contracted state and, on the other hand, Lt; / RTI >

Means the telescopic pipe.

In the case of a multi-stage telescopic pipe, two or more pipes are formed to be displaceable, thereby enabling a much more compact design structure. In both single- and multi-stage telescopic pipes, the stationary pipe is connected to the actuator and the displacement pipe (the final displaceable pipe in the case of the multistage embodiment) is connected to the injection nozzle holder. In addition, through the parallel alignment of the telescopic pipe and the setting piston, it is possible to guide the coolant to the injection nozzle holder even by using a plurality of telescopic pipes depending on the situation. At this time, the setting piston and the telescopic pipes are not necessarily located on one plane do. Also, through the compact construction of the device according to the invention, conventional strand guide segments may be retrofitted with an injection nozzle adjustment device (for example in the inner curve).

According to a preferred embodiment, a first telescopic pipe for guiding water and a second telescopic pipe for guiding air are provided, wherein the longitudinal axes of the setting piston, the first telescopic pipe and the second telescopic pipe are aligned in parallel. Whereby all media for the two-fluid injection nozzle are reliably and compactly guided from the drive body of the displacement device to the injection nozzle holder.

According to a further embodiment, the bellows is connected to the actuator and the jet nozzle holder, so that penetration of contaminants can be prevented. Through the bellows, penetration of contaminants, such as scale, is prevented at the bottom of the bellows (e.g., in the sealing area of the displacement device or telescopic pipe).

According to a particularly preferred embodiment, the bellows is assigned an air supply, preferably a second telescopic pipe, so that the bellows can be maintained at elevated pressure conditions relative to the atmosphere. By the elevated pressure, penetration of dust particles in the form of dust is effectively prevented.

According to an advantageous embodiment, the displacement device comprises a hydraulic, pneumatic or electric linear drive.

According to a further embodiment, a hydraulic or pneumatic linear drive is formed as a pressure medium cylinder. The use of pressure medium cylinders is desirable due to the high operating temperature near the strands.

In the case of spray nozzle regulating device manufacture, preferably the drive body and the stationary pipe of the at least one telescopic pipe comprise a cavity housing. However, likewise, the drive body and the stationary pipe may each comprise a separate housing which is connected to each other by means of connecting members, for example.

According to a particularly economical embodiment, a plurality of pressure medium cylinders are assigned a hydraulic or pneumatic flow divider, whereby the positions of the plurality of injection nozzles can be synchronously controlled. It is ensured by the flow divider that all the injection nozzles are synchronized and moved to the target position, which must not be possible, for example on the basis of interception - hence the unblocked injection nozzles are moved to the common position in a synchronized manner .

According to one embodiment, exactly one injection nozzle holder is assigned to one or more injection nozzles, preferably each injection nozzle, and exactly one displacement device is assigned to the injection nozzle holder, whereby the injection nozzle is positioned independently . So that a completely independent position of the spray nozzles may be possible.

According to a further embodiment, the at least one injection nozzle is assigned a displacement measuring device and a closed-loop control device, whereby the injection nozzle can be located in a closed-loop control manner. According to this embodiment, the injection nozzle can be positioned very accurately.

According to a very economical embodiment, a plurality of pressure medium cylinders are assigned to a flow divider formed by a plurality of speed-coupled geared motors, a velocity sensor assigned to a geared motor, and an open circuit or closed- Whereby the positions of the plurality of injection nozzles assigned to the pressure medium cylinders can be adjusted synchronously. According to this embodiment, the volume flow rate towards the pressure medium cylinders is detected via the speed sensor and controlled by the closed-loop control device. Even if it is not necessary to detect the position of the injection nozzles through the displacement measuring device in the conventional manner, the injection nozzles can be positioned sufficiently precisely.

Suitably, the strand guide segment for guiding, supporting and cooling the strand in a strand guide of a continuous casting machine, preferably a strand guide of a slab continuous casting machine for producing steel slabs having various strand widths, And at least one spray nozzle adjustment device according to any one of the preceding claims. The apparatus according to the invention is not only limited to a continuous slab continuous casting machine but also to a strand guide in the form of a strand guide segment; For example, in a large bloom format.

The injection nozzle adjusting device according to any one of the claims 1 to 10, characterized in that it is a continuous casting machine for producing a steel strand, preferably a steel slab, through a special compactness and long-term durability of the spray nozzle adjusting device according to the invention Or a strand guide segment according to claim 11 is used.

Additional advantages and features of the present invention are presented in the following description of non-limiting embodiments, with reference to the following drawings.

1 is a partial cross-sectional perspective view showing a strand guide segment including a plurality of jet nozzle adjustment devices.
Figures 2 and 3 are front and side sectional views, respectively, of the strand guide segment according to Figure 1;
4 is a cross-sectional view showing the spray nozzle adjusting device according to the present invention.
5A and 5B are perspective views showing a partially cutaway view and an uncut view of the spray nozzle adjustment device according to FIG.
6A and 6B are two hydraulic circuit diagrams for synchronously controlling a plurality of injection nozzle adjustment devices.
7 is a closed loop control circuit diagram for the spray nozzle adjustment device.
8 is a cross-sectional view showing a modified example of FIG.

1 to 3 show a strand guide segment 15 of a strand guide of a continuous casting machine for producing a steel slab from several viewpoints. In a continuous casting machine molten steel is injected into a permanent mold, not shown, and the steel forms at least partially solidified strands while being cooled. The strands are then guided and supported into a subsequent strand guide which is pulled out of the permanent mold by the driven strand guide rollers and formed in the shape of an arc in the figures, which, of course, can also be formed in the vertical or horizontal direction in other cases Followed by cooling. In the strand guide, both side widthwise sides of the strand 3 are supported by a plurality of strand guide rollers 16a and 16b, and a plurality of subsequent strand guide rollers 16a and 16b each comprise a strand guide segment 15 . More specifically, the strand guide segment 15 includes a lower frame 20 having fixed strand guide rollers 16b and a variable strand guide roller 16a, and an upper frame 19 positioned on the opposite side , And the strand guide rollers 16a of the upper frame 19 can be pressed onto the surface of the strand 3 by the adjusting cylinder 18; The upper frame 19 and the lower frame 20 are connected by four stays 17. Even when the widths of the strands 3 are different, in order to prevent too strong cooling (so-called supercooling) of the edge region, a plurality of jetting nozzles (not shown) 2 are disposed. In this case, exactly one injection nozzle adjustment device 1 is assigned to each injection nozzle 2, so that the positions of the injection nozzles can be individually adjusted to the strand width. 1 and 2 show two positions of the injection nozzle 2 when there are a plurality of the injection nozzle adjusting devices 1 and broken line marks indicate that the width of the strand 3 is the maximum, ≪ / RTI >

Fig. 4 shows the spray nozzle adjusting device 1 according to the present invention for positioning the spray nozzle 2 in more detail. The injection nozzle adjustment device 1 includes a displacement device 6, a spray nozzle holder 4 and an injection nozzle 2, and the displacement device 6 includes a fixed drive body 21 and a displacement type setting piston 5, and more specifically, as a pressure medium cylinder 11. As shown in Fig. The injection nozzle 2 is formed as a two-fluid nozzle, whereby the water-air mixer can be injected onto the unshown strand. The spray nozzle holder 4 is supplied with water and air coolant by two telescopic single-sided telescopic pipes 7a and 7b and the telescopic pipes 7a and 7b likewise receive the spray nozzle holder 4 or the spray nozzle 2 ). Specifically, each of the coolants is introduced into the drive body 21 by the medium inlet 22 on the end face, then guided to the injection nozzle holder 4 via the telescopic pipes 7a and 7b, Is continuously mixed with the water in the jet nozzle holder (4) and guided to the jet nozzle (2). In order to simplify the sealing of the telescopic pipes 7a and 7b, the longitudinal axes 8 of the setting piston 5 and the telescopic pipes 7a and 7b are aligned in parallel. A bellows 9 is arranged between the drive body 21 and the jet nozzle holder 4 to prevent contamination of the displacement device 6 or the telescopic pipes and in particular the seals of these displacement devices and telescopic pipes, Seal the space portion enclosed in a substantially dustproof manner. In order to almost completely prevent the penetration of dust particles, an air supply device 10 is assigned to the bellows 9 and an air supply device is formed as a nozzle 23 having a fine opening cross section in the telescopic pipe 7b . Through the nozzle 23 air is introduced from the telescopic pipe 7b into the space defined by the bellows 9 so that the space is maintained at a lower overpressure condition with respect to the periphery, Penetration of dust down the bellows is prevented. The displacement device 6 is formed as a dual acting hydraulic cylinder according to Fig. However, it is also conceivable to form the displacement device 6, which likewise includes a plunger cylinder (i. E., As a single acting hydraulic cylinder including a return spring, for example). The oil ports assigned to the pressure medium cylinder 11 for the sake of overview are not shown. As shown, the actuator 21 comprises three chambers, a centrally located first chamber is used as a cavity for the pressure medium cylinder 11, and each chamber arranged outward is a telescopic pipe 7a, 7b, respectively. In addition, the two outer chambers include respective media inlets 22.

5A and 5B show the spray nozzle adjusting device 1 according to the present invention according to Fig. 4 in two additional aspects, respectively.

6A and 6B show two hydraulic circuit diagrams for the respective spray nozzle adjusting apparatuses 1, respectively. In Figure 6a, the pressure medium cylinders 11 of the two displacement devices 6 are previously interconnected by a hydraulic flow divider 12, which is formed as a linear motion flow divider; In Fig. 6b, the connection of the pressure medium cylinders 11 of the displacement devices 6 is likewise effected by a hydraulic flow divider 12, which is formed by two speed-driven gear motors. 6A and 6B, only the displacement devices 6 of the injection nozzle adjustment devices 1 are shown for the sake of overview because the hydraulic circuit diagram is important.

Fig. 7 shows a closed circuit control circuit diagram for the spray nozzle adjusting device 1 for positioning a single injection nozzle 2. In Fig. The pressure medium cylinder 11 of the displacement device 6 is formed as a double acting hydraulic cylinder and is connected to a hydraulic valve 24 formed as a 4/3 directional control valve. The injection nozzle holder 4 is connected to a displacement measuring device 13 which feeds back the actual position 26 to the closed-loop control device 14. [ The closed loop control device 14 calculates the operating variable 28 from the control deviation 27 in consideration of the target position 25 and using the closed loop control algorithm, ).

Fig. 8 shows a modification of Fig. In this case, the driving body 21 of the displacement device 6 and the fixed pipes 29 of the telescopic pipes 7a, 7b each comprise separate housings, Are connected to each other via the connecting members 31 in order to fix the holder 4 unrotatably. In the embodiment in which the housings are separated, there is an advantage that, for example, the closed telescopic pipes 7a, 7b can be exchanged without the displacement of the displacement device 6. [ Of course, the injection nozzle 2 need not necessarily be formed as a multiple fluid nozzle in this variant, so that only a single telescopic pipe is required, for example for a so-called "water only" nozzle. In this variant, the drive body 21 comprises a chamber used as a cavity for the pressure medium cylinder 11; The stationary pipes 29 of the telescopic pipes 7a, 7b each comprise a chamber used as a retraction for the displaceable pipe 30. [

1: injection nozzle adjustment device 2: injection nozzle
3: Strand 4: Spray nozzle holder
5: Setting piston 6: Displacement device
7a, 7b: telescopic pipe 8:
9: Bellows 10: Air supply
11: pressure medium cylinder 12: flow divider
13: Displacement measuring device 14: Closed loop control device
15: Strand guide segment
16a and 16b: strand guide rollers
17: stayer 18: adjusting cylinder
19: upper frame 20: lower frame
21: actuator 22: media inlet
23: nozzle 24: hydraulic valve
25: Target position 26: Actual position
27: control deviation 28: operating variable
29: Fixed pipe 30: Displacement pipe
31:

Claims (13)

An injection nozzle adjustment device (1) for positioning one or more injection nozzles (2) against a strand (3) in a strand guide of a continuous slab caster,
- a displacement device (6) having a drive body (21) and a setting piston (5) for displacing the setting piston (5) against the fixed drive body
- a jet nozzle holder (4) for holding one or more jet nozzles (2)
Wherein the injection nozzle is formed to spray a coolant onto the strands and the injection nozzle holder is connected to the setting piston,
There is provided at least one telescopic pipe (7a, 7b) comprising a fixed pipe (29) and at least one displaceable pipe (30) for guiding the coolant to the injection nozzle holder (4) Is connected to the driving body (21) so that the injection nozzle (2) is connected to the driving body (21) uninterruptedly,
The longitudinal axes 8 of the setting piston 5 and the telescopic pipes 7a and 7b are aligned in parallel,
There is provided a first telescopic pipe 7a for guiding water and a second telescopic pipe 7b for guiding air, the setting piston 5, the first telescopic pipe 7a and the second telescopic pipe 7a, Characterized in that the longitudinal axes (8) of the longitudinal axis (7b)
Spray nozzle adjustment device.
The method according to claim 1,
Characterized in that the bellows (9) is connected to the drive body (21) and the injection nozzle holder (4) so that penetration of contaminants can be prevented.
Spray nozzle adjustment device.
3. The method of claim 2,
Characterized in that the bellows (9) is assigned an air supply device (10) so that the bellows (9) can be maintained at elevated pressure conditions relative to the atmosphere,
Spray nozzle adjustment device.
3. The method of claim 2,
Characterized in that said bellows (9) is assigned said second telescopic pipe (7b) so that said bellows (9) can be maintained in an elevated pressure condition relative to the atmosphere,
Spray nozzle adjustment device.
5. The method according to any one of claims 1 to 4,
Characterized in that the displacement device (6) comprises a hydraulic, pneumatic, or electric linear drive device.
Spray nozzle adjustment device.
6. The method of claim 5,
Characterized in that said hydraulic or pneumatic linear drive is formed as a pressure medium cylinder (11)
Spray nozzle adjustment device.
5. The method according to any one of claims 1 to 4,
Characterized in that the drive body (21) and the stationary pipe (29) of the at least one telescopic pipe (7a, 7b) comprise a cavity housing.
Spray nozzle adjustment device.
The method according to claim 6,
Characterized in that a plurality of pressure medium cylinders (11) are assigned hydraulic or pneumatic flow dividers (12), whereby the positions of the plurality of injection nozzles (2)
Spray nozzle adjustment device.
5. The method according to any one of claims 1 to 4,
Exactly one injection nozzle holder 4 is assigned to one or more injection nozzles 2 and exactly one displacement device 6 is assigned to the injection nozzle holder 4 so that the injection nozzle 2 Characterized in that it can be positioned independently,
Spray nozzle adjustment device.
10. The method of claim 9,
Characterized in that at least one jetting nozzle (2) is assigned a displacement measuring device (13) and a closed-loop control device (14) whereby the jetting nozzle (2)
Spray nozzle adjustment device.
In a strand guide segment (15) for guiding, supporting and cooling a strand (3) in a strand guide of a continuous casting machine,
Characterized in that the strand guide segment (15) comprises at least one jetting nozzle adjustment device (1) according to any one of the claims 1 to 4,
Strand guide segment.
5. The method according to any one of claims 1 to 4,
Characterized in that said injection nozzle adjustment device (1) is used in a continuous casting machine for producing steel strands (3)
Spray nozzle adjustment device.
12. The method of claim 11,
Characterized in that the strand guide segments (15) are used in a continuous casting machine for producing steel strands (3)
Strand guide segment.

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