WO2011012303A2

WO2011012303A2 - Device and method for detecting the pressure distribution of a cooling medium applied in a continuous casting plant or rolling mill train

Info

Publication number: WO2011012303A2
Application number: PCT/EP2010/004635
Authority: WO
Inventors: Norbert Vogl; Dirk Lieftucht; Uwe Plociennik
Original assignee: Sms Siemag Ag
Priority date: 2009-07-30
Filing date: 2010-07-29
Publication date: 2011-02-03
Also published as: EP2459336A2; DE102009035402A1; EP2459336B1; WO2011012303A3; CN102497940A

Abstract

The invention relates to a device (1) and a method for detecting the pressure distribution of cooling medium in a continuous casting plant or rolling mill train, wherein the continuous casting plant or rolling mill train comprises at least one roller pair of two rollers (3) that form a roller gap through which a strand can be guided. Water jets are arranged in the casting direction upstream and/or downstream of the at least one roller pair that can apply a strand with cooling medium. The device substantially comprises the measurements of a strand in relation to the width direction and/or the thickness direction and the device (1) comprises at least one pressure measuring film (2) that is arranged on the surface of the device (1) in such a way that the pressure distribution of the cooling medium can be detected by the pressure measuring film (2) when the device (1) is fed into the continuous casting plant or rolling mill train instead of a strand.

Description

Apparatus and method for detecting the pressure distribution of the applied in a continuous casting or rolling mill cooling medium

Field of the invention

The invention is in the field of detecting the pressure distribution of the cooling medium applied in a continuous casting plant or rolling mill. To measure the pressures of applied spray water, devices with sensors are introduced into the roll gap of the continuous casting or rolling mill.

State of the art

Devices and methods are known in which devices are introduced into the roller gap, which are able to determine the spray water distribution in binary at a few discrete points.

An example of such a device is the "Roll Gap Checker" from Vatron GmbH, Linz, Austria, which has 8 microphones arranged in the width direction, which can be used to evaluate the noise of each individual spray nozzle. Software filters filter out unwanted noise, but this device has the major disadvantage of not being able to look in detail at the nozzle's actual spray cone Splash water occurs in the casting direction in front of the rollers and influences the cooling of a strand, especially in the area of the rollers e effects are not covered by the Roll Gap Checker described.

BESTATIGUNGSKOPIE Another device which monitors the function of spray nozzles in a continuous casting plant is shown in patent application EP 0 011 896 A1. This device is introduced, similar to the Roll Gap Checker, instead of a strand in the roller gap of the system. In the device there is a recess in which there is an array of several individual sensors arranged in a row perpendicular to the casting direction. A disadvantage of this arrangement is inter alia the arrangement of sensors at a certain distance, so that the spray water cones can be characterized only inaccurately. Furthermore, due to the large recess in which the sensors are located, it is not possible to investigate the generation of surge water.

The technical problem that arises from the above-mentioned prior art is to overcome the disadvantages mentioned.

DISCLOSURE OF THE INVENTION The technical problem is solved by the presently claimed invention, the invention initially comprising a device for detecting the pressure distribution of cooling medium in a continuous casting plant or rolling train, the continuous casting plant or rolling train comprising at least one pair of rolls forming a roll nip in the one Strand can be passed through, wherein in the casting direction before and / or behind the at least one pair of rollers spray water nozzles are arranged, which can act on a strand with cooling medium and wherein the device has substantially the dimensions of a strand with respect to the width direction and / or the thickness direction and the device comprises at least one pressure measuring foil arranged on the surface of the device so that the pressure distribution of the cooling medium through the pressure measuring foil can be detected when the device is inserted into the continuous casting plant instead of a strand e or rolling mill is introduced. Such a device can easily detect or characterize the spray water areas or the spray cones of individual nozzles with a very high local resolution. The pressure of occurring splash water can also be detected, whereby knowledge of the exact distribution of coolant on the strand surface is obtained. In a preferred embodiment of the device, the at least one pressure measuring film is arranged over the entire width of the device.

This arrangement of the pressure measuring film, the function of the spray water nozzles can be tested over the entire width of a strand.

In a further preferred embodiment of the device, the pressure measuring film is arranged on the top and / or bottom of the device.

This allows the cooling effect of spray nozzles on both sides of a strand to be tested.

In a further preferred embodiment of the device, the pressure measuring film has a thickness of less than 0.5 mm. Such a thinly selected measuring film has the advantage that it only minimally increases the thickness of the device and thus has virtually no influence on the thickness of the device.

In a further preferred embodiment of the device, the pressure measuring film is arranged in a recess of the device whose depth corresponds to the thickness of the pressure measuring film.

Although such an embodiment of the device requires an additional recess, the pressure measuring foil can then be installed flush with the surface of the device, which results in even more realistic measuring conditions in comparison with an actual strand. In a further preferred embodiment of the device, the pressure measuring film is designed as a flexible grid of pressure-sensitive sensors.

In a further preferred embodiment of the device, each sensor is formed by a matrix of rows and columns of semiconductor material whose electrical resistance changes when a force is exerted on them.

In a further preferred embodiment of the device, the device comprises a nozzle exchange device for changing nozzles.

If any defective nozzles have been found by the device described above, they can be replaced directly by an exchange device in the device.

In a further preferred embodiment of the device, the nozzle exchange device comprises a robot arm, which can remove and / or install nozzles. In addition to the described device, the invention further comprises a method for detecting the pressure distribution of cooling medium in a continuous casting or rolling mill, wherein the continuous casting or rolling mill comprises at least one pair of rollers, which forms a roller gap and between which a strand can be passed therethrough, in the casting before and / or behind the at least one pair of rollers spray water nozzles are arranged, which can act on a strand with cooling medium, wherein a device is introduced instead of a strand in the continuous casting or rolling mill, so that the pressure distribution of the cooling medium can be detected, the device substantially Dimensions of a strand with respect to the width direction and / or the thickness direction and the device comprises at least one pressure measuring film for detecting the pressure distribution.

The method has substantially the same advantages as the present device for detecting the pressure distribution of cooling medium. In a preferred embodiment of the method, the device comprises an evaluation device with which the detected pressure distribution of the cooling medium is represented computer-aided.

Thus, it is possible that an accurate picture of the pressure distribution and thus the coolant distribution is displayed on the strand surface. In a preferred embodiment of the method, data detected by the pressure measuring film, preferably wirelessly, are transmitted to the evaluation device.

In a further preferred embodiment of the method, the formation of splash water in the casting direction in front of the rollers is detected by the pressure measuring film.

In a further preferred embodiment of the method, the device comprises a nozzle exchange device, are replaced by the defective nozzles.

With the evaluation device, the heat transfer between strand and water spray and splash water can also be determined by comparison with reference values. This allows the calculation of the temperature distribution of the strand with the current water supply. This calculation is part of the evaluation unit.

Brief description of the figures

The figures of the embodiments will be briefly described below. Further details can be found in the detailed description of the embodiments. Show it:

FIG. 1a: a perspective view of a roll carpet together with rolls and drawn nozzle sticks and spray cones; and

FIG. 1 b: the roller carpet from FIG. 1 a in a different perspective; and Figure 2: A pressure measuring device according to the invention for introduction into a roller gap; and

FIG. 3: The device according to the invention from FIG. 2 in the roller gap of a roller carpet according to FIG. 1.

Detailed description of the embodiments

Figures 1a and 1b show a conventional arrangement of rollers 3 in a roll carpet of a continuous casting plant in two different perspectives. The rollers 3 form opposite pairs of rollers. Between the rollers 3, spray nozzles are arranged in the casting direction (for example in FIGS. 1a and 1b from top to bottom). Shown are in Figure 1a and 1b, the nozzle sticks 4, at the ends of the nozzles (not explicitly shown) are. These nozzles spray cooling medium or water onto a strand. Such a strand (not shown) moves in the roller gap between the rollers 3 of a respective pair of rollers. In this case, the spray water forms a spray water cone 5 or a spray water region on a strand running between the rolls.

FIG. 2 shows a device 1 according to the invention. This can instead of a strand in the continuous casting, as it is shown, for example, in the figures 1a and 1b, retracted. In this case, the device 1 is formed from a body which substantially coincides with a strand with respect to the width dimension and the thickness dimension, that is, for example, has the same cross-section as a strand.

According to the invention, a pressure measuring film 2 is now attached to the surface of the device 1, preferably on one of the broad sides, of the strand. The

Pressure measuring film 2 can, as can be seen in FIG. 2, be arranged over the entire width of the device. Such pressure measuring films 2 are commercial available, such as by the company Tekscan Inc., South Boston, USA. Corresponding pressure measuring films have high resolutions of, for example, 248 measuring points per cm ² . Acquisition rates can be 10,000 Hz or more. Thicknesses of such pressure measuring foils 2 can be, for example, only 0.1 mm, so that they almost do not influence a measurement by their intrinsic thickness. In particular, such films 2 are designed to be a flexible grid of pressure-sensitive sensors, each sensor being formed by a matrix of rows and columns of semiconductor material whose electrical resistance changes when a force is applied thereto. The data determined by the pressure measuring film 2 can be transmitted, preferably via a wireless connection, to a preferably external evaluation device which also displays the spray and splash water distribution on the surface graphically. It is also possible to determine the heat transfer conditions using reference values and to calculate the temperatures of the strand.

Optionally, it is also possible that a data memory and / or at least a part of the evaluation device is arranged within the device 1.

Further construction details of the shape of the body of a device 1 are familiar to the person skilled in the art and are known from the prior art. Often, such so-called "strand dummies" consist of steel elements connected by joints.

As can also be seen in FIG. 2, additional sensors can be arranged on the surface of the device in addition to the pressure measuring film 2, for example pressure sensors of another type or temperature sensors and other sensors for measuring the conditions on the steel surface.

In particular, however, a nozzle replaceable device 6 can be arranged in the body of the device 1. This device 6 can serve to replace defective nozzles. This can be done, for example, by a robotic arm. are taken, which is disposed within the device in a recess under a hinged lid and can install and remove if necessary nozzles.

FIG. 3 shows the device 1 according to FIG. 2 in the roller gap of a roller carpet, as already shown in FIGS. 1a or 1b. The device 1 is inserted instead of a strand in the continuous casting. Furthermore, in Figure 3, the rollers 3, 4 nozzle blocks and spray cone 5 are also shown the continuous casting. As already shown in FIG. 2, the device 1 comprises a pressure measuring film 2, which is arranged on one of the broad sides of the device 1, so that the pressure distribution of the cooling medium through the film 2 can be detected.

LIST OF REFERENCE NUMBERS

1: device

2: pressure measuring film

3: roll

4: Nozzle

5: Spray cone

6: nozzle exchange device

Claims

claims

1. A device for detecting the pressure distribution of cooling medium in a continuous casting or rolling mill, wherein the continuous casting or rolling mill comprises at least one roller pair which forms a roller gap for performing a strand, wherein in the casting direction before and / or behind the at least one pair of rollers spray water nozzles are arranged which can act on the strand with the cooling medium,

characterized,

that the device (1) is substantially the dimensions of a

Strand with respect to the width direction and / or the thickness direction, and that the device comprises at least one pressure measuring film (2) disposed on the surface of the device (1) for detecting the pressure distribution of the cooling medium when the device (1) instead a strand is introduced into the continuous casting or rolling mill.

2. The device according to claim 1, wherein the at least one pressure measuring film (2) over the entire width of the device (1) is arranged.

3. The device according to one of the preceding claims, wherein the pressure measuring film (2) on the top and or the bottom of the device (1) is arranged.

4. The device according to one of the preceding claims, wherein the pressure measuring film (2) has a thickness of less than 0.5 mm.

5. The device according to one of the preceding claims, wherein the pressure measuring film (2) is arranged in a recess of the device (1) whose depth corresponds to the thickness of the pressure measuring film (2).

6. The device according to one of the preceding claims, wherein the pressure measuring film (2) is designed as a flexible grid of pressure-sensitive sensors.

7. The device of claim 6, wherein each sensor is formed by a matrix of rows and columns of semiconductor material whose electrical resistance changes when a force is applied thereto.

8. The device according to one of the preceding claims, wherein the device comprises a nozzle exchange device (6) for changing nozzles.

The apparatus of claim 8, wherein the nozzle replacement device (6) comprises a robotic arm that can remove and / or install nozzles.

10. A method for detecting the pressure distribution of cooling medium in a continuous casting or rolling mill, wherein the continuous casting or rolling mill comprises at least one pair of rollers, which forms a roller gap and between which a strand can be passed therethrough, in the casting before and / or behind the at least one Roller pair spray water nozzles are arranged, which can act on the strand with the cooling medium, wherein a device instead of a

Strand is introduced into the continuous casting plant or rolling train, so that the pressure distribution of the cooling medium can be detected, characterized in that

that the device (1) is substantially the dimensions of a

Strand in relation to the width direction and / or the thickness direction; and

in that the device (1) comprises at least one pressure measuring film (2) for detecting the pressure distribution.

11. The method according to claim 10, wherein the device comprises an evaluation device and the detected pressure distribution of the cooling medium is represented computer-assisted by means of the evaluation device.

12. The method according to claim 11, wherein data detected by the pressure measuring film (2) is preferably transmitted to the evaluation device wirelessly.

13. The method according to any one of claims 10 to 12, wherein by the pressure measuring film (2) the splash water formation is detected in the casting direction in front of the rollers.

14. The method according to any one of claims 10 to 13, wherein the device comprises a nozzle exchange device (6) and through this nozzle exchange means (6), in particular a robot arm, defective nozzles are exchanged.

15. The method according to one of the preceding claims 11 to 14, wherein the evaluation unit from the signals of the pressure measuring film on reference values, the heat transfer ratios between strand and

Spray and splash water determined and calculated the temperatures of the strand.