RU2574569C2 - Device for rearrangement of atomisers - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to continuous casting of slabs. Claimed device (1) comprises actuator (6) with the drive with its housing (21) and piston (5), and the holder (4) of atomisers coupled with the piston (5). To feed the coolant to said holder (4) at least one telescopic tube (7a, 7b) is used and composed of at least one moving tube (30) and stationary tube (29) coupled with the housing (21) and fixed thereat. Lengthwise axes (8) of the actuator drive piston (5) and telescopic tube (7a, 7b) are parallel.

EFFECT: higher safety, compact design.

13 cl, 8 dwg

Description

The present invention relates to a device for rearranging spray nozzles for positioning at least one spray nozzle and a guide stand segment for guiding, supporting and cooling a continuously cast workpiece in a guide stand of a continuous slab casting machine.

Specifically, the invention relates to a device for repositioning spray nozzles for positioning at least one spray nozzle relative to a continuously cast billet in a guide stand of a continuous slab casting machine having

- a moving device including a driving body and an actuator piston for moving an actuator piston relative to a stationary driving body; and

a spray nozzle holder for attaching at least one spray nozzle, the spray nozzle being configured to spray coolant onto a continuously cast billet, and the spray nozzle holder is connected to an actuator piston.

Such a device is known, for example, from EP 010347 B1. It can be used to adjust the position of one or more spray nozzles of the guide stand segment relative to the continuously cast billet, while the spray nozzles are connected by means of a spray nozzle holder with a moving actuator piston. The disadvantage of this device is, however, that, on the one hand, the coolant must be directed from the stationary driving body of the moving device to the movable holder of the spray nozzles by means of a hose line, and on the other hand due to the fact that the piston of the actuator and, at the same time, also the spray nozzle made with the possibility of rotation relative to the moving device, you need a separate direction of the holder of the spray nozzles. Due to the hose line or, accordingly, the direction of the holder of the spray nozzles increases, in addition, the area occupied by the device for moving the spray nozzles, so that installation in existing segments of the guide stand is difficult and costly.

The objective of the invention is to overcome the disadvantages of the prior art and to indicate a particularly compact device for rearranging spray nozzles of the above kind, in which the coolant is technically safe, in particular, without the use of hose lines, from the fixed part of the installation of the guide stand, for example, a transfer device, can be directed to the spray nozzle ; in particular, it should also be possible to retrofit existing segments of the guide stand with a device for rearranging spray nozzles.

This problem is solved using a device of the above kind, in which

- at least one telescoping telescoping telescopic pipe including a fixed and at least one movable pipe, wherein the fixed pipe is connected to the drive body, is provided to direct the coolant to the holder of the spray nozzles, so that the spray nozzle is connected to the drive body without rotation possibilities; and

- the longitudinal axis of the piston of the actuator and the telescopic pipe are oriented in parallel.

Using the device of the invention, firstly, the coolant by means of a telescopic pipe is very technically safe and, above all, without hose lines requiring intensive maintenance, it is directed from the fixed part of the installation of the guide stand, for example, the leading body of the transfer device, to the spray nozzle, which can be made in the form of a single-component or two-component nozzle; secondly, the holder of the spray nozzles and at the same time also the spray nozzle is connected to the moving device by means of a telescopic pipe without rotation possibility, i.e. the holder of the spray nozzles is fixed against rotation relative to the moving device. The telescopic tube can, in principle, be made single or multi-stage. Single-stage execution means a telescopic pipe,

- including a fixed and movable pipe, both pipes being oriented coaxially, and the movable pipe has a smaller diameter than the fixed pipe,

- in which the movable pipe is sealed relative to the stationary pipe and

- in which the movable pipe is made movable (also called telescopically extendable) with respect to the fixed pipe, so that the telescopic pipe, on the one hand, has a smaller structural length in the retracted state, and on the other hand, a large structural length is provided in the extended state.

In a multi-stage telescopic pipe, at least two pipes are movable, so that an even more compact design is possible. In both a single-stage and a multi-stage telescopic pipe, the fixed pipe is connected to the driving body, and the movable pipe (with the multi-stage design, the last movable pipe) with the holder of the spray nozzles. Due to the parallel orientation of the telescopic pipe and the piston of the actuator, it is also possible, under certain circumstances, to direct the coolant to the holder of the spray nozzles also by several telescopic pipes, while the piston of the actuator and telescopic pipes do not have to lie in the same plane. Due to the compact design of the device according to the invention, the existing segments of the guide stand can also be equipped with a device for relocating the spray nozzles (for example, on the internal arc).

In one preferred embodiment, the first telescopic pipe is provided for directing water and the second telescopic pipe is for directing air, while the longitudinal axes of the piston of the actuator, the first telescopic pipe and the second telescopic pipe are oriented in parallel. Due to this, all working environments for the two-component spray nozzle are technically safe and compactly directed from the leading body of the transfer device to the holder of the spray nozzles.

In another embodiment, the bellows is connected to a drive body and a spray nozzle holder, so that penetration of dirt can be prevented. Thanks to the bellows, dirt, such as scale, is prevented from penetrating under the bellows (for example, in the seal area of the transfer device or telescopic pipe).

In one particularly preferred embodiment, ventilation is provided for the bellows, preferably a second telescopic tube, whereby the bellows can be pressurized in comparison with the atmosphere. Due to the increased pressure, the penetration of dust particles of dirt is effectively prevented.

In one of the mechanical damage resistant embodiments, the moving device includes a hydraulic, pneumatic or electric linear actuator.

In another embodiment, the hydraulic or pneumatic linear actuator is in the form of a hydraulic cylinder. The use of hydraulic cylinders is preferable due to high operating temperatures near the continuously cast billet.

For the manufacture of a device for rearranging spray nozzles, it is preferable if the driving body and the stationary pipe of at least one telescopic pipe have one common housing. But it is also possible that the driving body and the fixed tube have each separate body, which, for example, is connected to each other by means of connecting elements.

In one particularly economical embodiment, a plurality of hydraulic cylinders are provided with a single hydraulic or pneumatic flow divider, so that the position of several spray nozzles can be synchronously controlled. By means of a flow divider, it is ensured that all spray nozzles synchronously come to their nominal position, and if this is not possible, for example due to a blockade, non-blocked spray nozzles nevertheless come to one general position with synchronous control.

In one embodiment, for at least one, preferably for each spray nozzle, exactly one spray nozzle holder is provided, and for the spray nozzle holder there is precisely one moving device, so that independent positioning of the spray nozzle is possible. Thanks to this, it is possible to independently position the spray nozzles.

In another embodiment, at least one spray nozzle is provided with a displacement measuring device and a control device, whereby the positioning of the spray nozzle is adjustable. Through this embodiment, the spray nozzle can be positioned with high accuracy.

According to one economical embodiment, a plurality of flow dividers are provided for several hydraulic cylinders, which is formed by several gear-type hydraulic motors connected in rotation speed, a speed sensor, which is provided for the gear-type hydraulic motor, and a control or regulation device, so that it is possible to synchronously control the position of several spray nozzles that are provided for hydraulic cylinders. Through this embodiment, the volumetric flow to the hydraulic cylinders is detected by a speed sensor and controlled by a control device. Although the position of the spray nozzles should not be classically recorded using a displacement measuring device, it is still possible to accurately position the spray nozzles.

It is advisable that the segment of the guide stand for guiding, supporting and cooling the continuously cast billet in the guide stand of a continuous casting machine, preferably a continuous slab casting machine for the manufacture of steel slabs with different widths of continuously cast billets, includes at least one spray transfer device nozzles according to one of claims 1 to 10 of the claims. The device according to the invention is not limited to either continuous slab casting machines or a guide stand in the form of a guide stand segment; It is also possible, for example, to use square formats for large formats.

Due to the special compactness and long service life of the device for rearranging spray nozzles according to the invention, it is preferable to use this device for rearranging spray nozzles according to one of claims 1 to 9 or a segment of the guide stand according to claim 10 in a continuous casting machine for manufacturing continuously cast billets of steel, preferably a steel slab.

Other advantages and features of the present invention are contained in the following description of non-limiting embodiments, with reference to the following figures, which show the following:

figure 1 is a perspective view, partially in cross section of a segment of the guide stand, equipped with several devices for rearranging spray nozzles;

figure 2 and 3 is a front view and side view in section of a segment of the guide stand shown in figure 1;

figure 4 - image in cross section of one of the invention of the device for rearranging spray nozzles;

FIGS. 5a and 5b are a partially cut-away and un-cut-away view of a device for rearranging the spray nozzles shown in FIG. 4 in a perspective view;

6a and 6b are two hydraulic synchronous control circuits for several devices for rearranging spray nozzles;

7 is a control circuit of a device for rearranging spray nozzles;

Fig.8 is a variant of Fig.4.

Figure 1-3 shows a segment 15 of the guide stand of the machine for continuous casting of blanks for the manufacture of steel slabs in several forms. In a continuous casting machine, molten steel is poured into an unimaged mold, the steel being cooled and at least partially solidified continuously cast billet being formed. Then, the continuously cast billet is pulled out of the mold by means of drive rollers of the guide stand and guided, supported and further cooled in the subsequent guide stand, which is arcuate in the figures, but otherwise can, of course, also be made vertically or horizontally. In the guide stand, both wide sides of the continuously cast billet 3 are supported by several guide stand rollers 16a, 16b, with several subsequent guide stand rollers 16a, 16b respectively forming a guide stand segment 15. Specifically, the guide stand segment 15 has a lower frame 20 provided with stationary guide stand rollers 16b and an upper frame 19 located opposite thereto, provided with adjustable guide stand rollers 16a, wherein the guide stand rollers 16a of the upper frame 19 can be mounted on a continuously cast blank 3; the upper frame 19 and the lower frame 20 are connected by four racks 17. In order to prevent too much cooling (i.e., overcooling), in particular of the edge regions, even at different widths of the continuously cast billet 3, both on the upper side and on the lower side continuously cast billet there are several spray nozzles 2, each equipped with the provided devices 1 for rearranging spray nozzles. Moreover, for each spray nozzle 2 there is exactly one device 1 for moving the spray nozzles, so that the position of the spray nozzle along the width of the continuously cast billet can be individually adjusted. In figures 1 and 2, several devices 1 for moving the spray nozzles show two positions of the spray nozzle 2, while the image with a dashed line corresponds to the position of the spray nozzle 2 at the maximum width of the continuously cast billet 3.

In Fig. 4, the device 1 for shifting the spray nozzles for positioning the spray nozzles 2 according to the invention is shown in more detail. The device 1 for shifting the spray nozzles includes a movement device 6, a holder 4 of spray nozzles and a spray nozzle 2, while the movement device 6 is made in the form of a hydraulic linear actuator, specifically in the form of a hydraulic cylinder 11 including a stationary driving body 21 and a movable actuator piston 5. The spray nozzle 2 is made in the form of a two-component nozzle, so that a mixture of water and air can be sprayed onto an unimagined continuously cast billet. The holder 4 of the spray nozzles by means of two telescopically sliding, single-stage telescopic pipes 7a, 7b is provided with cooling means water and air, while the telescopic pipes 7a, 7b also constitute a rotation lock of the holder 4 of spray nozzles or, respectively, of the spray nozzle 2. Specifically, one cooling medium by means of the end input 22 for the working medium is introduced into the leading body 21 and then sent through the telescopic pipe 7a, 7b to the holder 4 of spraying forces NOC, wherein the air is mixed with water in the holder 4 and the spray nozzles directed on to the spray nozzle 2. To simplify seal telescopic tubes 7a, 7b, 8, the longitudinal axis of the piston 8 of the actuator and telescopic pipes 7a, 7b are oriented parallel. In order to avoid contamination of the moving device 6 or, respectively, telescopic pipes and, in particular, their seals, a bellows 9 is located between the drive body 21 and the holder 4 of the spray nozzles, and this bellows substantially dustproof closes the space enclosed inside it. To almost completely prevent the penetration of dust particles for the bellows 9, ventilation 10 is provided, and it is made in the form of a nozzle 23 with a small cross-section of the hole in the telescopic tube 7b. Through the nozzle 23, air flows from the telescopic pipe 7b into a space that is limited by the bellows 9, so that this space is under a slight overpressure relative to the environment, thereby preventing dust from entering the bellows. The device 6 movement in accordance with figure 4 is made in the form of a hydraulic cylinder of double action; but it would also be possible to design a movement device 6 with a plunger cylinder (i.e., in the form of a single-acting hydraulic cylinder, for example, provided with a return spring). For illustration purposes, the oil connections provided for the hydraulic cylinder 11 are not shown. As shown, the driving body 21 has three chambers, with the first, centrally located, the chamber serves as a cavity for the hydraulic cylinder 11 and, along one chamber located outside, serves to reverse the movable pipe 30 of the telescopic pipe 7a, 7b. Both external chambers also have one input 22 for the working medium.

FIGS. 5a and 5b show two other views of the inventive device 1 for shifting the spray nozzles shown in FIG. 4.

On figa and 6b shows two hydraulic circuits for each of the devices 1 for moving the spray nozzles. In Fig. 6a, the hydraulic cylinders 11 of the two movement devices 6 by means of a hydraulic flow divider 12, which is designed as a linear flow divider, are initially connected to each other; 6b, the connection of the hydraulic cylinders 11 of the movement devices 6 is also carried out by means of a hydraulic flow divider 12, which, however, is formed by two gear motors connected in terms of speed. Since FIGS. 6a and 6b refer to hydraulic circuits, for the sake of clarity, only devices 6 for moving devices 1 for rearranging spray nozzles were shown.

Figure 7 shows a control circuit of a device 1 for shifting spray nozzles for positioning one separate spray nozzle 2. The hydraulic cylinder 11 of the moving device 6 is made in the form of a double-acting hydraulic cylinder and is connected to a hydraulic valve 24, which is made in the form of a four-way three-position valve. The holder 4 of the spray nozzles is connected to the device 13 for measuring displacement, which confirms the achievement of the actual position 26 of the device 14 of the regulation. The control device 14, taking into account the nominal position 25 and using the control algorithm for the deviation 27 of the controlled variable, calculates the control action 28, which, if necessary after amplification, is transmitted to the hydraulic valve 24.

On Fig depicted one of the variants of figure 4. In this case, the leading body 21 of the moving device 6 and the fixed tubes 29 of the telescopic tubes 7a, 7b each have separate housings, which, however, are connected to each other by means of connecting elements 31 to fix the rotation of the holder 4 of the spray nozzles relative to the driving body 21. Separate execution of the housings has the advantage that, for example, it is possible to replace a worn telescopic tube 7a, 7b without replacing the transfer device 6. Of course, the spray nozzle 2, and in this embodiment, in no case should be made in the form of a multicomponent nozzle, so that, for example, for the so-called “water only” nozzle (only for water) only one single telescopic pipe was needed. In this embodiment, the drive body 21 has a chamber that serves as a cavity for the hydraulic cylinder 11; the fixed tubes 29 of the telescopic tubes 7a, 7b have one chamber each, which serves to reverse the movable tube 39.

Reference List

1 Spray nozzle switcher

2 spray nozzle

3 Continuous casting

4 Spray nozzle holder

5 Actuator piston

6 Travel device

7a, 7b Telescopic tube

8 longitudinal axis

9 Bellows

10 Ventilation

11 hydraulic cylinder

12 Flow rate divider

13 Motion measuring device

14 Regulation device

15 Guide stand segment

16a, 16b Guide stand rollers

17 Rack

18 Positioning cylinder

19 Upper frame

20 lower frame

21 Leading body

22 Input for the work environment

23 nozzle

24 hydraulic valve

25 rated position

26 Actual position

27 Variation deviation

28 Fixed tube

30 Movable pipe

31 Connecting element.

Claims (13)

1. A device (1) for rearranging spray nozzles in a roller guide of a continuous slab casting machine, positioning at least one spray nozzle (2) relative to a continuously cast billet (3), containing
- a device (6) for moving, including an actuator with a housing (21) of the drive and a piston (5) configured to move relative to the stationary housing (21) of the drive, and
- a holder (4) for attaching at least one spray nozzle (2) configured to spray coolant onto a continuously cast billet (3) connected to an actuator piston (5), characterized in that it is provided with at least one telescopic a pipe (7a, 7b), consisting of at least one movable pipe (30) and a fixed pipe (29) connected to the housing (21) of the drive, designed to direct the coolant to the holder (4) of the spray nozzles, and spray sunka (2) connected to the housing (21) without relative rotation of the actuator and the longitudinal axis (8) of the piston (5) of the actuator and telescopic pipes (7a, 7b) are parallel. 2. The device according to p. 1, characterized in that the first telescopic pipe (7a) is designed to supply water, and the second telescopic pipe (7b) is for supplying air. 3. The device according to claim 1 or 2, characterized in that it is equipped with a bellows (9) that prevents the ingress of dirt, connected to the housing (21) of the drive and the holder (4) of the spray nozzles. 4. The device according to claim 3, characterized in that it is equipped with a device (10) for supplying air to the bellows (9) to create increased pressure in it, preferably made in the second telescopic tube (7b). 5. The device according to claim 1, characterized in that the moving device (6) comprises a hydraulic, pneumatic or electric linear actuator. 6. The device according to claim 5, characterized in that the hydraulic or pneumatic linear actuator is made in the form of a hydraulic or pneumatic cylinder (11). 7. The device according to claim 1, characterized in that the housing (21) of the drive and the fixed tube (29) of at least one telescopic pipe (7a, 7b) have a common housing. 8. The device according to p. 3, characterized in that the housing (21) of the drive and the fixed tube (29) of at least one telescopic pipe (7a, 7b) have a common housing. 9. The device according to one of paragraphs. 6-8, characterized in that it is equipped with a hydraulic or pneumatic flow divider (12) connected to the said cylinders (11) and configured to synchronously control the position of the spray nozzles (2). 10. The device according to one of paragraphs. 1, 2, 4-8, characterized in that at least one spray nozzle (2) is made with the possibility of independent positioning and is connected to only one holder (4) of the spray nozzle connected to only one device (6) of movement. 11. The device according to p. 9, characterized in that at least one spray nozzle (2) is made with the possibility of independent positioning and is connected to only one holder (4) of the spray nozzle connected to only one device (6) of movement. 12. The device according to p. 10, characterized in that at least one spray nozzle (2) is made with the possibility of adjustable positioning and is equipped with a measuring device for displacement and control device. 13. A segment (15) of a roller guide machine for continuous casting of billets for guiding, supporting and cooling a continuously cast billet (3), characterized in that it includes at least one device (1) for shifting the spray nozzles according to one of claims. 1-12.

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