KR101424448B1 - Method for controlling descaler - Google Patents

Abstract

A control method of a descaler, the control method comprising: checking whether a rolling material enters a descaler having a plurality of nozzles of a plurality of columns; when the rolling material enters, the control unit controls descaling information Selecting a spray nozzle to be used for removing scale from a plurality of rows of spray nozzles based on the spray history performed on the spray nozzle, and spraying water to the rolled material through the selected spray nozzle, When a plurality of nozzles are provided, it is possible to improve the abrasion characteristics of the rolling roll by using the nozzles of each row uniformly, and to effectively maintain the scaler.

Description

{METHOD FOR CONTROLLING DESCALER}

The present invention relates to a control method of a descaler, and more particularly, to a control method of a descaler that uniformly uses injection nozzles of each column when a plurality of columns of injection nozzles are provided in a descaler.

Generally, in a hot rolling mill, rolled materials such as slabs are heated to a predetermined temperature in a heating furnace, then subjected to width rolling and thickness rolling through a width rolling mill and a rough rolling mill, thin rolled through a finishing mill, Coil type to produce a hot-rolled coil which is a material of a product desired by a consumer or a cold-rolling process which is a post-process.

The major equipment for such hot rolling process is a heating furnace, a width mill, a roughing mill, a finishing mill, and a coiling machine. Particularly, the finishing rolling process is a rolling process in which a rolling material rolled in a rough rolling mill is rolled with a plurality of tandem finishers Is a key process to produce products of the desired thickness.

On the other hand, in the process of rolling the hot rolled material, contact with the surrounding oxygen is inevitable, which results in a scale due to the oxidation reaction on the surface of the rolled material. This scale hinders the commercialization of hot-rolled coils, so a descaler is located in the middle of the rolling process to remove scale by injecting high-pressure water into the rolling material.

A related prior art is Korean Patent Laid-Open Publication No. 10-2011-0098050 (published on Sep. 1, 2011, entitled "Deserializer").

SUMMARY OF THE INVENTION It is an object of the present invention to provide a dispenser capable of effectively maintaining the descaler by uniformly using the injection nozzles of each row when the dispenser is provided with a plurality of rows of spray nozzles, And to provide a control method thereof.

According to an aspect of the present invention, there is provided a method of controlling a descaler, the method comprising: checking whether a rolling material enters a descaler having a plurality of nozzles; Selecting the injection nozzle to be used for the scale removal from the plurality of rows of injection nozzles based on the descaling information on the rolled material and the previously executed injection history when the rolling material enters; And spraying water to the rolling material through the spray nozzle selected by the controller.

In the step of selecting the spray nozzle to be used for the scale removal of the present invention, the control unit selects the spray nozzle to be used for the scale removal so that the plurality of rows of spray nozzles are used equally.

In the present invention, the control unit selects an injection nozzle having the smallest cumulative injection number among the plurality of the injection nozzles.

In the present invention, the control unit sequentially selects the plurality of rows of the injection nozzles.

According to the present invention, when the dispenser is provided with a plurality of rows of spray nozzles, the intervals of spray nozzles can be increased and the clogging of the spray nozzles can be reduced because the spray nozzles in each row are used uniformly, Effective maintenance is possible.

Further, according to the present invention, since the injection nozzles are used alternately, it is possible to prevent accumulation of wear at a specific point in the rolling roll, thereby improving the wear characteristics of the rolling roll and reducing the failure of the rolling roll.

1 is a block diagram illustrating a configuration of a control apparatus for performing a method of controlling a descaler according to an embodiment of the present invention.
2 is a flowchart illustrating an operation of a method of controlling a descaler according to an embodiment of the present invention.

Hereinafter, a control method of a descaler according to the present invention will be described in detail with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

1 is a block diagram illustrating a configuration of a control apparatus for performing a method of controlling a descaler according to an embodiment of the present invention.

1, a controller for performing a method of controlling a descaler according to an embodiment of the present invention includes a mode setting input unit 10, a rolling material sensing unit 20, an upper control unit 30, (40), a memory unit (50), and an injection nozzle unit (60).

The mode setting input unit 10 sets the automatic mode or the manual mode from the operator and transmits the setting to the control unit 40.

The automatic mode means a mode in which the selection of the injection nozzles is automatically performed in a descaler (not shown) having a plurality of nozzles, and the manual mode means a mode in which the operator selects and operates the direct injection nozzle.

The rolled material sensing unit 20 senses a rolling material (not shown) entering the descaler, generates a sensing signal, and transmits the sensed signal to the controller.

The rolled material detecting unit 20 may include a camera (not shown) to detect the rolled material, and may include a proximity sensor (not shown), an infrared ray sensor, a sensor (not shown) So that the rolled material can be detected.

The upper control unit 30 provides the control unit 40 with descaling information on the rolling material entering the descaler. The descaling information includes column information of the ejection nozzles used for descaling of the plurality of columns of the spray nozzles provided in the descaler, and is set differently depending on the type and size of the rolled material.

For example, if the descaler is equipped with two rows of injection nozzles, the descaling information for the continuously entering rolled material can be given as in Table 1 below.

Rolled material number Thermal information of the injection nozzle used One Use both columns 2 Use only one column 3 Use only one column 4 Both columns are unused 5 Use only one column

In this case, since the case where the injection nozzle of each row is used equally is used in the case of the 1,4-rolled material, since both the injection nozzles of two rows are used or both of the injection nozzles of two rows are not used, In the case of rolling material No. 5, a certain row of nozzles can be used repeatedly.

In this way, when the injection nozzle of a specific row is used repeatedly, the replacement period of the frequently used injection nozzle is reduced, and clogging of the injection nozzle which is not frequently used may occur.

Further, since the overlap length of each injection nozzle provided in each column and the injection pressure can not be completely equalized in practice, the spray pattern in the width direction is not constant.

Therefore, when the injection nozzle of a particular row is repeatedly used, a widthwise temperature deviation of the rolled material can occur, and when such rolled material repeatedly passes through the rolling roll, wear on a certain point of the rolling roll is concentrated, ≪ / RTI >

When the automatic mode is set by the mode setting input unit 10, the control unit 40 receives the descaling information provided from the upper control unit 30 and the descaling information provided from the memory unit 50, The spray nozzle to be used for removing the scale is selected from the plurality of rows of the spray nozzles based on the spray history stored in the spray nozzle.

At this time, the control unit 40 can sequentially select the spray nozzles to be used for the scale removal so that the multiple-row spray nozzles are used equally.

With reference to Table 1 above, for example, for the second, third, and fifth rolling materials, the control unit 40 can select the two rows of spray nozzles by crossing as shown in Table 2 below.

Rolled material number The first thermal spray nozzle The second thermal spray nozzle One use use 2 use unused 3 unused use 4 unused unused 5 use unused

In addition, the control unit 40 may select the injection nozzles of the columns having the smallest accumulated injection frequency based on the cumulative injection frequency in which the injection nozzles of the respective columns are used.

As described above, by using the injection nozzles of each row evenly, it is possible to increase the replacement period of the injection nozzles, to reduce clogging of the injection nozzles, and to effectively maintain the descaler.

In the memory unit 50, the dispense history of the descaler is stored.

Here, the injection history means information on the history of using the plurality of rows of the injection nozzles provided in the descaler, and may include information on the cumulative injection frequency of each column.

The injection nozzle unit 60 injects high pressure water into the upper portion of the rolled material under the control of the control unit 40 and may include a plurality of rows of injection nozzles as described above.

FIG. 2 is a flowchart illustrating an operation of a descaler control method according to an exemplary embodiment of the present invention. Referring to FIG. 2, the descaler includes a plurality of nozzles for spraying, .

As shown in FIG. 2, first, the control unit 40 receives a sensing signal from the rolled material sensing unit 20 to check whether the rolling material enters the descaler (S100).

When a sensing signal is input from the rolled material sensing unit 20, the control unit 40 determines whether the automatic mode is set from the mode setting input unit 10 (S110).

If the automatic mode is set, the controller 40 receives descaling information for the rolled material from the upper controller 20 (S120). As described above, the descaling information includes column information of the ejection nozzles to be used for descaling from a plurality of rows of the ejection nozzles provided in the descaler.

Thereafter, the control unit 40 selects the spray nozzles to be used for removing the scale from the plurality of nozzles based on the descaling information input from the upper control unit 20 and the spray history stored in the memory unit 50 (S130).

At this time, the control unit 40 can sequentially select the spray nozzles to be used for the scale removal so that the multiple-row spray nozzles are used equally.

In addition, the control unit 40 may select the injection nozzle of the column having the smallest accumulated injection frequency based on the cumulative injection frequency of each column so that the multiple injection nozzles are used equally.

Then, the control unit 40 injects high pressure water into the rolling material through the selected injection nozzle (S140), updates the injection history, and stores the updated injection history in the memory unit (S150).

If it is determined in step S110 that the automatic mode is not set, the manual mode is set. Therefore, the operator selects and drives the injection nozzle in step S160.

As described above, according to the control method of the descaler according to the present invention, when the descaler is provided with a plurality of rows of spray nozzles, since the spray nozzles of each row are used equally, the replacement cycle of the spray nozzles can be increased, The clogging phenomenon of the descaler can be reduced and effective maintenance of the descaler is possible.

Further, since the injection nozzles are used alternately, it is possible to prevent the accumulation of wear at specific points in the rolling rolls, thereby improving the wear characteristics of the rolling rolls and reducing the defects of the rolling rolls.

In the meantime, in the present embodiment, the case where the injection nozzles provided in the same column are selected at the same time as the selection is performed in units of columns has been described, but it is also possible to select the nozzles in units of individual nozzles will be.

Table 3 shows an example of injection nozzle selection for the case where the descaling information for the rolled material is as shown in Table 1.

Rolled material number The first thermal spray nozzle The second thermal spray nozzle One use use 2 Use odd nozzle nozzles Use even-number spray nozzles 3 Use even-number spray nozzles Use odd nozzle nozzles 4 unused unused 5 Use odd nozzle nozzles Use even-number spray nozzles

That is, all of the two rows of spray nozzles are used for the second, third, and fifth rolling materials set to use only one row of spray nozzles, and the scale removal may be performed by alternately using half of the spray nozzles provided in each column .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand. Accordingly, the technical scope of the present invention should be defined by the following claims.

10: Mode setting input
20: rolled material detection unit
30:
40:
50: injection nozzle part

Claims (4)

Checking whether a control material enters a descaler having a plurality of rows of injection nozzles;
Selecting the injection nozzle to be used for the scale removal from the plurality of rows of injection nozzles based on the descaling information on the rolled material and the previously executed injection history when the rolling material enters; And
Wherein the control unit includes a step of injecting water into the rolling material through the selected injection nozzle, wherein in the step of selecting the injection nozzle to be used for the scale removal, the control unit sets the cumulative injection number Is selected as the injection nozzle to be used for the descaling of the scale.
delete delete The method of controlling a descaler according to claim 1, wherein the controller sequentially selects the plurality of rows of the injection nozzles.

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