KR102174987B1 - Device for preventing interference between descaler rows of finishing scale breaker using counter water jet - Google Patents

Abstract

The descaler hot interference shielding apparatus includes a counter injection header coupled to the first descaler, and a plurality of counter nozzles positioned along the length direction of the counter injection header. A plurality of counter nozzles are installed to have a lead angle toward the rear to spray a plurality of counter water jets onto the steel plate. The total width of the collision area of the plurality of counter waterjets against the steel sheet is equal to or greater than the total width of the collision area of the plurality of second waterjets sprayed from the second descaler, and the injection force of each of the plurality of counter waterjets is the plurality of second waterjets. It is equal to or greater than the spraying force of each water jet.

Description

DEVICE FOR PREVENTING INTERFERENCE BETWEEN DESCALER ROWS OF FINISHING SCALE BREAKER USING COUNTER WATER JET}

The present invention relates to a rolling facility, and more particularly, to an apparatus for blocking hot interference of a descaler in a finishing scale breaker composed of a plurality of rows of descalers.

In a hot rolling mill of a steel mill, a descaler is a device that removes scale (iron oxide) by spraying a high-pressure water jet on the surface of a steel sheet. Among them, the Finishing Scale Breaker (FSB) installed at the front end of the Finishing Mill (FM) is an important facility that determines the surface quality of the steel sheet, and is composed of two or three rows of descalers.

However, the water jet sprayed from the descaler of the rear row interferes with the water jet sprayed from the descaler of the front row after colliding with the steel plate, reducing the scale removal performance. In order to prevent such performance degradation, conventionally, an intermediate roll is installed between two adjacent descalers.

However, the descaler and the intermediate roll are covered with a hood, and there is a high-speed flow containing a large amount of scale powder inside the hood. Since the intermediate roll is exposed to such flow for a long period of time, abrasion occurs, and the worn portion of the intermediate roll may contact the steel plate and cause damage to the steel plate surface.

The present invention is to solve the above-described problem, and the descaler of a finishing scale breaker capable of improving the scale removal performance by blocking interference between the water jet of the post heat descaler and the water jet of the front heat descaler. To provide an interference blocking device.

In one embodiment of the present invention, the finishing scale breaker is installed to have a first descaler having a plurality of first nozzles for spraying a plurality of first water jets, and having a first lead angle toward the front. 2 It includes a second descaler disposed behind the first descaler and having a plurality of second nozzles for spraying the water jet. The descaler hot interference shielding apparatus includes a counter injection header coupled to the first descaler, and a plurality of counter nozzles positioned along the length direction of the counter injection header. A plurality of counter nozzles are installed to have a second lead angle toward the rear to spray a plurality of counter water jets onto the steel plate. The total width of the collision area of the plurality of counter waterjets against the steel plate is equal to or greater than the total width of the collision area of the plurality of second waterjets, and the injection force of each of the plurality of counter waterjets is equal to or greater than the injection force of each of the plurality of second waterjets Bigger than this.

The collision area of each of the plurality of counter waterjets may be thin and linear, and the total width of the collision area of the plurality of counter waterjets may be larger than the width of the steel sheet. The collision regions of each of the plurality of counter waterjets may be parallel to the width direction of the steel sheet, and two neighboring collision regions among the plurality of collision regions may have an overlap region.

On the other hand, the plurality of counter nozzles may be classified into a first group positioned at an upper left of the steel plate and a second group positioned at an upper right of the steel plate. The plurality of counter nozzles belonging to the first group may be offset so that the right end of the collision area faces rearward than the left end. The plurality of counter nozzles belonging to the second group may be offset so that the left end of the collision area faces rearward than the right end.

The offset angles of the plurality of counter nozzles belonging to the first group and the offset angles of the plurality of counter nozzles belonging to the second group may have the same value. It may have overlapping areas.

The plurality of counter nozzles may be positioned higher from the steel plate than the plurality of second nozzles, and may be provided in a smaller number than the plurality of second nozzles. The spray angle of each of the plurality of counter water jets may be greater than the spray angle of each of the plurality of second water jets.

The plurality of counter nozzles and the plurality of second nozzles may be configured to satisfy at least one of the following comparative formulas (1) to (4).

--- (1)

--- (One)

--- (2)

--- (2)

--- (3)

--- (3)

--- (4)

--- (4)

는 카운터 워터젯의 질량 유량,

는 제2 워터젯의 질량 유량, V_C는 카운터 워터젯의 속도, V_D는 제2 워터젯의 속도, P_C는 카운터 워터젯의 압력, P_D는 제2 워터젯의 압력, ρ는 물의 밀도를 나타낸다.Here, θ _CL is the lead angle of the counter waterjet, θ _DL is the lead angle of the second waterjet,

Is the mass flow rate of the counter waterjet,

Is the mass flow rate of the second waterjet, V _C is the speed of the counter waterjet, V _D is the speed of the second waterjet, P _C is the pressure of the counter waterjet, P _D is the pressure of the second waterjet, and ρ is the density of water.

In another embodiment of the present invention, the finishing scale breaker is positioned at a distance from each other along the conveying direction of the steel plate from the upper part of the steel plate, and a plurality of nozzles installed to have a lead angle toward the front, and a plurality of nozzles are used for high pressure. It includes a plurality of rows of descalers each including a spray header and a supply pipe to supply water. The descaler hot interference blocking device is installed on each of the descalers except for the last one among the plurality of descalers, and supplies high-pressure water through a plurality of counter nozzles and a plurality of counter nozzles installed to have a lead angle toward the rear. Includes a counter firing header. One of the plurality of counter injection headers installed in the remaining descaler is connected to a supply pipe included in the descaler in the last row through a connection pipe installed with a valve.

The plurality of rows of descalers may include a first descaler, a second descaler, and a third descaler that are sequentially positioned along the transport direction of the steel sheet. The counter injection header installed in the first descaler may be connected to a supply pipe included in the third descaler through a first connection pipe in which the first valve is installed.

The counter injection header installed in the second descaler may be connected to a supply pipe included in the second descaler through a second connection pipe in which a second valve is installed.

The first valve may be opened when the first descaler and the third descaler operate simultaneously. The first valve and the second valve may be opened when the first descaler, the second descaler, and the third descaler operate simultaneously.

Among the remaining descalers, the total width of the collision area of the plurality of counter waterjets sprayed from the plurality of counter nozzles installed on the descaler of the front row is the total width of the collision area of the plurality of waterjets sprayed from the plurality of nozzles included in the descaler of the rear row Can be equal to or greater than The spraying force of each of the plurality of counter waterjets may be equal to or greater than the spraying force of each of the plurality of waterjets.

According to the present invention, the water jet sprayed from the descaler of the post-heat by injecting the counter water jet in the opposite direction to the water jet for descaling collides with the steel plate and the water jet sprayed from the descaler of the electric heat Can be blocked from causing interference. Therefore, it is possible to increase the scale removal performance, and by rapidly discharging the retained water, it is possible to prevent a decrease in temperature of the steel sheet by the retained water.

1 is a perspective view of a finishing scale breaker having a descaler hot interference blocking device according to a first embodiment of the present invention.
2 is a front view of the finishing scale breaker shown in FIG. 1.
3 is a plan view of the finishing scale breaker shown in FIG. 1.
4 is a configuration diagram illustrating a plurality of first counter nozzles and a plurality of second nozzles among the finishing scale breakers shown in FIG. 1.
5 is a block diagram illustrating a first counter nozzle and a second nozzle of the finishing scale breaker shown in FIG. 1.
6 is a perspective view of a finishing scale breaker having a descaler hot interference blocking device according to a second embodiment of the present invention.
7 is a partial plan view of the finishing scale breaker shown in FIG. 6.
8 is a plan view of a finishing scale breaker having a descaler hot interference blocking device according to a third embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art may easily implement the present invention. The present invention may be implemented in various different forms, and is not limited to the embodiments described herein.

1 is a perspective view of a finishing scale breaker having a descaler hot interference blocking device according to a first embodiment of the present invention, FIG. 2 is a front view of the finishing scale breaker shown in FIG. 1, and FIG. 3 is shown in FIG. A top view of a finishing scale breaker.

1 to 3, the finishing scale breaker 100 includes a first descaler 10 and a second descaler installed side by side along the width direction (y direction) of the steel plate S from the top of the steel plate S. It includes a scaler 20 and a third descaler 30. The second descaler 20 is located behind the first descaler 10 along the transport direction (y direction) of the steel plate S, and the third descaler 30 is located behind the second descaler 20 do.

Throughout the specification,'front' means the direction in which the steel plate S enters into the finishing scale breaker 100, and'rear' means the direction in which the steel plate S passes through the finishing scale breaker 100 and then exits. Means.

The first descaler 10 includes a first spray header 11 parallel to the width direction (y direction) of the steel plate S, and the length direction of the first spray header 11 from the lower side of the first spray header 11 It includes a plurality of first nozzles 12 arranged at a distance from each other along the line. The plurality of first nozzles 12 receive high-pressure water from the first spray header 11 and spray the first water jet J1 toward the steel plate S.

The second descaler 20 includes a second spray header 21 parallel to the width direction (y direction) of the steel plate S, and the length direction of the second spray header 21 from the lower side of the second spray header 21 It includes a plurality of second nozzles 22 disposed at a distance from each other along the line. The plurality of second nozzles 22 receive high-pressure water from the second spray header 21 and spray the second water jet J2 toward the steel plate S.

The third descaler 30 includes a third jet header 31 parallel to the width direction (y direction) of the steel plate S, and a longitudinal direction of the third jet header 31 from the lower side of the third jet header 31 It includes a plurality of third nozzles 32 disposed at a distance from each other along the line. The plurality of third nozzles 32 receive high-pressure water from the third spray header 31 and spray the third water jet J3 toward the steel plate S.

Each of the first to third water jets J1, J2, and J3 expands along the width direction (y direction) of the steel plate S as it approaches the steel plate S and collides with the steel plate S in the form of a thin line. That is, the collision area of each of the first to third water jets J1, J2, J3 against the steel plate S is made of a thin linear shape, and each of the first to third water jets J1, J2, J3 has a predetermined spray angle. has (θ _DS ).

The plurality of first water jets J1, the plurality of second water jets J2, and the plurality of third water jets J3 remove scales on the surface of the steel plate S three times. At this time, each of the plurality of first to third nozzles 12, 22, and 32 is installed to have a first lead angle θ _DL toward the front so that the scale separated from the steel plate S does not flow backward. Each of the first to third water jets J1, J2, and J3 is sprayed obliquely toward each other.

When the first to third descalers 10, 20, 30 are operated, the water splashed by the second water jet J2 colliding with the steel plate S may cause interference with the first water jet J1, and the third Water splashed by the water jet J3 colliding with the steel plate S may cause interference with the second water jet J2. In this case, since the jetting power of the first and second water jets J1 and J2 decreases, scale performance decreases.

The descaler hot interference blocking apparatus 200 according to the first embodiment blocks the descaler hot interference by using a counter water jet. At this time, the counter water jet means a water jet sprayed in a direction opposite to the water jet sprayed from the descaler of the rear row.

Specifically, the descaler hot interference blocking device 40 includes a first counter jet header 41 connected to the first descaler 10 and a plurality of first counter nozzles installed on the first counter jet header 41 ( 42), a second counter jet header 43 connected to the second descaler 20, and a plurality of second counter nozzles 44 installed on the second counter jet header 43.

The first counter injection header 41 is parallel to the first injection header 11 and may be coupled to the upper side of the first injection header 11 by the first connection part 51. The plurality of first counter nozzles 42 are aligned along the length direction of the first counter jet header 41, receive high pressure water from the first counter jet header 41, and use a first counter water jet ( CJ1) is sprayed.

The second counter injection header 43 is parallel to the second injection header 21 and may be coupled to the upper side of the second injection header 21 by the second connection part 52. The plurality of second counter nozzles 44 are aligned along the length direction of the second counter jet header 43, receive high pressure water from the second counter jet header 43, and use a second counter water jet ( CJ2) is sprayed.

Each of the first and second counter water jets CJ1 and CJ2 expands along the width direction (y direction) of the steel plate S as it approaches the steel plate S and collides with the steel plate S in the form of a thin line. Each of the first and second counter water jets CJ1 and CJ2 has a predetermined spray angle θ _CS .

The plurality of first and second counter nozzles 42 and 44 are installed to have a second lead angle θ _CL toward the rear and spray the first and second counter water jets (CJ1, CJ2) at an angle toward the rear. do. The plurality of first counter water jets CJ1 blocks interference between the first water jet J1 and the second water jet J2, and the plurality of second counter water jets CJ2 is configured with the second water jet J2 and the third water jet. Interference between J3) is blocked.

4 is a configuration diagram illustrating a plurality of first counter nozzles and a plurality of second nozzles among the finishing scale breakers shown in FIG. 1. Each of the plurality of second counter nozzles and the plurality of third nozzles has the same configuration as the plurality of first counter nozzles and the plurality of second nozzles shown in FIG. 4.

1 and 4, each of the plurality of first counter nozzles 42 and the plurality of second nozzles 22 may be disposed at equal intervals along the width direction (y direction) of the steel plate S. The plurality of first counter nozzles 42 have a second lead angle θ _CL toward the rear, and the plurality of second nozzles 22 have a first lead angle θ _DL toward the front. The second lead angle θ _CL may have a value greater than the first lead angle θ _DL , and may fall within a range of approximately 5° to 45°.

The plurality of first counter water jets (CJ1) have the same spray angle (θ _CS ), and the collision area of the first counter water jet (CJ1) with respect to the steel plate (S) is parallel to the width direction (y direction) of the steel plate (S). can do. The plurality of second water jets J2 have the same spray angle θ _DS , and the collision area of the second water jet J2 with respect to the steel plate S may be parallel to the width direction (y direction) of the steel plate S. have. Two adjacent collision areas may have overlapping areas overlapping each other.

The number of the plurality of first counter nozzles 42 may be smaller than the number of the plurality of second nozzles 22, and the spray angle θ _CS of the first counter water jet CJ1 is a fraction of the second water jet J2. It can be larger than the square (θ _DS ). In addition, the width W _C of the collision area of the first counter water jet CJ1 with respect to the steel plate S may be greater than the width W _D of the collision area of the second water jet J2 with respect to the steel plate S.

In the configuration of FIG. 4, the total width W _TC of the collision areas of the plurality of first counter water jets CJ1 with respect to the steel sheet may be expressed as Equation (2) through Equation (1) below.

,

, O_C = W_C - P_C --- (1)

,

, O _C = W _C -P _C --- (1)

W _TC = W _C ×N _C- {O _C (N _C -1)} = P _C (N _C -1)+W _C --- (2)

Here, L _C is the length of the first counter water jet (CJ1), SOD _C is the height of the first counter nozzle 42 with respect to the steel plate, θ _CL is the lead angle of the first counter nozzle 42, θ _CS is the first The jet angle of the counter water jet CJ1, O _C denotes the width of the overlap area, P _C denotes the pitch (distance between centers) of the first counter nozzle 42, and N _C denotes the number of the first counter nozzles 42.

In addition, in the configuration of FIG. 4, the total width W _TD of the collision regions of the plurality of second water jets J2 with respect to the steel sheet may be expressed as Equation (4) through Equation (3) below.

,

, O_D = W_D - P_D --- (3)

,

, O _D = W _D -P _D --- (3)

W _TD = W _D ×N _D- {O _D (N _D -1)} = P _D (N _D -1) + W _D --- (4)

Here, L _D is the length of the second water jet J2, SOD _D is the height of the second nozzle 22 with respect to the steel plate, θ _DL is the lead angle of the second nozzle 22, and θ _DS is the second water jet J2 ), O _D denotes the width of the overlap area, P _D denotes the pitch (distance between the centers) of the second nozzle 22, and N _D denotes the number of the second nozzles 22.

In the descaler hot interference blocking device 40 of the first embodiment, the total width W _TC of the plurality of first counter water jets (CJ1) collision areas with respect to the steel plate is equal to that of the plurality of second water jets (J2) collision areas with respect to the steel plate. It is configured to satisfy a condition equal to or greater than the overall width (W _TD ). (W _TC ≥ W _TD )

As shown in FIG. 2, the water splashed after the plurality of second water jets J2 collide with the steel plate S collides with the first counter water jet CJ1 and joins the first counter water jet CJ1. 1 It is discharged to the outside of the steel plate S together with the counter water jet (CJ1).

The plurality of first counter water jets CJ1 form a wide barrier wall between the first descaler 10 and the second descaler 20, and the second water jet J2 bounces after colliding with the steel plate S. It effectively blocks water over a large area. That is, the plurality of first counter water jets CJ1 function as a physical barrier wall that is the same as a member such as a barrier wall or a barrier roll.

When the total width W _TC of the collision areas of the plurality of first counter water jets CJ1 is equal to or greater than the total width W _TD of the collision areas of the plurality of second water jets J2, the plurality of first counter water jets CJ1 is Interference of the second water jet J2 with respect to the 1 water jet J1 can be effectively blocked. In this case, the total width W _TC of the collision areas of the plurality of first counter water jets CJ1 may be greater than the width of the steel plate S.

5 is a block diagram illustrating a first counter nozzle and a second nozzle of the finishing scale breaker shown in FIG. 1. Each of the second counter nozzle and the third nozzle has the same configuration as the first counter nozzle and the second nozzle shown in FIG. 5.

Referring to FIG. 5, the first counter nozzle 42 sprays a water jet with a force equal to or greater than that of the second nozzle 22. That is, the jetting force F _C of the first counter water jet CJ1 is equal to or greater than the jetting force F _D of the second water jet J2. (F _C ≥ F _D ) For this purpose, the first counter nozzle 42 and the second nozzle 22 may be configured to satisfy at least one of Equations (5) to (8) below.

--- (5)

--- (5)

--- (6)

--- (6)

--- (7)

--- (7)

--- (8)

--- (8)

는 제1 카운터 워터젯(CJ1)의 질량 유량,

는 제2 워터젯(J2)의 질량 유량, V_C는 제1 카운터 워터젯(CJ1)의 속도, V_D는 제2 워터젯(J2)의 속도, P_C는 제1 카운터 워터젯(CJ1)의 압력, P_D는 제2 워터젯(J2)의 압력, ρ는 물의 밀도를 나타낸다.Here, θ _CL is the lead angle of the first counter water jet (CJ1), θ _DL is the lead angle of the second water jet (J2),

Is the mass flow rate of the first counter water jet (CJ1),

Is the mass flow rate of the second water jet (J2), V _C is the speed of the first counter water jet (CJ1), V _D is the speed of the second water jet (J2), P _C is the pressure of the first counter water jet (CJ1), P _D is the pressure of the second water jet J2, and ρ is the density of water.

When the jetting force F _C of the plurality of first counter water jets CJ1 is equal to or greater than the jetting force F _D of the plurality of second water jets J2, the plurality of first counter water jets CJ1 is applied to the first water jet J1. It is possible to effectively block interference of the second water jet J2.

Referring to FIGS. 1 to 3 again, water splashed by the second water jet J2 colliding with the steel plate S joins the first counter water jet CJ1 and is quickly discharged to the outside of the steel plate S. The water splashed by the third water jet J3 colliding with the steel plate S also joins the second counter water jet CJ2 and is quickly discharged to the outside of the steel plate S.

In this way, the water splashed from the water jet of the rear row does not affect the water jet of the front heat, and the plurality of first to third water jets J1, J2, J3 can exhibit the intended spraying force. Therefore, the finishing scale breaker 100 equipped with the descaler hot interference blocking device 40 can improve the scale removal performance, and prevent the residual water from remaining on the steel sheet S, thereby reducing the temperature of the steel sheet S by the residual water. Can be prevented.

6 is a perspective view of a finishing scale breaker having a descaler hot interference blocking device according to a second embodiment of the present invention, and FIG. 7 is a partial plan view of the finishing scale breaker shown in FIG. 6.

6 and 7, in the second embodiment, each of the plurality of first and second counter nozzles 42 and 44 is installed to have a predetermined offset angle θ _CO . The offset angle θ _CO refers to the angle of the collision area of the counter water jets CJ1 and CJ2 with respect to the width direction (y direction) of the steel plate S.

Specifically, each of the plurality of first counter nozzles 42 and the plurality of second counter nozzles 44 has a first group G1 located at the upper left of the steel plate S, and the upper right of the steel plate S. It may be classified into the located second group G2.

The first and second counter nozzles 42 and 44 belonging to the first group G1 are offset so that the right end of the collision area is positioned rearward than the left end. The first and second counter nozzles 42 and 44 belonging to the second group G2 are offset so that the left end of the collision area is positioned rearward than the right end. Offset angle (θ _CO) of the offset of the first group (G1) each (θ _CO) and a second group (G2) can have the same value.

Overall, the collision areas of the plurality of first and second counter water jets CJ1 and CJ2 form a V shape toward the rear. In addition, the two adjacent collision regions have an overlap region overlapping along the transport direction (x direction) of the steel plate S. In FIG. 7, the width of the overlap area is indicated by O _C.

Since the plurality of first and second counter water jets CJ1 and CJ2 having such an offset angle θ _CO are rapidly discharged outside the edge of the steel plate S, the scaler hot interference blocking device 40 of the second embodiment is a steel plate (S) It is possible to increase the performance of removing the residual water above.

In the configuration of the second embodiment, the total width W _TC of the collision area of the plurality of first counter water jets CJ1 with respect to the steel plate S may be expressed as Equation (10) through Equation (9) below. .

,

, O_C = W_C - P_C --- (9)

,

, O _C = W _C -P _C --- (9)

W _TC = W _C ×N _C- {O _C (N _C -1)} = P _C (N _C -1) + W _C --- (10)

Here, θ _CO represents the offset angle of the first counter water jet CJ1, and the rest are the same as those described in Equations (1) and (2). The total width W _TC of the collision regions of the plurality of first counter waterjets CJ1 is equal to or greater than the total width W _TD of the collision regions of the plurality of second waterjets J2.

The descaler hot interference blocking device 40 of the second embodiment is the same as the first embodiment, except for the offset angles of the plurality of first and second counter nozzles 42 and 44, and redundant descriptions are omitted. .

8 is a plan view of a finishing scale breaker having a descaler hot interference blocking device according to a third embodiment of the present invention.

Referring to FIG. 8, in the third embodiment, each of the first to third injection headers 11, 21, and 31 is connected to the first to third supply pipes 13, 23, and 33 to supply high pressure water through them. Receive. In addition, the first counter injection header 41 may be connected to the third supply pipe 33 through the first connection pipe 45 in which the first valve V1 is installed, and the second counter injection header 43 is a second valve It may be connected to the second supply pipe 23 through the second connection pipe 46 in which (V2) is installed.

In the third embodiment, in the finishing scale breaker, the first and third descalers 10 and 30 excluding the second descaler 20 operate simultaneously, or the first to third descalers 10, 20, 30 It can work at the same time.

When the first and third descalers 10 and 30 excluding the second descaler 20 operate at the same time, the first valve V1 is opened and the high pressure water of the third supply pipe 33 is injected by a first counter It can be supplied to the header 41.

When the first to third descalers 10, 20, and 30 operate simultaneously, the first valve V1 and the second valve V2 are opened to inject the high-pressure water of the third supply pipe 33 into a first counter The high-pressure water of the second supply pipe 23 may be supplied to the second counter jet header 43 while being supplied to the header 41.

The scaler hot interference isolating device 40 of the third embodiment is provided with first and second counter injection headers by simple operation of the first valve V1 and the second valve V2 without having a separate on/off facility. 41, 43) can easily control the high pressure water supply. The scaler hot interference blocking device 40 of the third embodiment is the same as the first or second embodiment described above, except for the piping configuration, and redundant descriptions are omitted.

In the above, preferred embodiments of the present invention have been described, but the present invention is not limited thereto, and it is possible to implement various modifications within the scope of the claims, the detailed description of the invention, and the accompanying drawings. It is natural to fall within the scope of

100: finishing scale breaker 10: first descaler
11: first injection header 12: first nozzle
20: second descaler 21: second injection header
22: second nozzle 30: third descaler
31: third injection header 32: third nozzle
40: descaler hot interference blocking device
41: first counter injection header 42: first counter nozzle
43: second counter injection header 44: second counter nozzle

Claims (12)

A first descaler having a plurality of first nozzles for spraying a plurality of first water jets toward the front, and a plurality of second descalers located behind the first descaler and spraying a plurality of second water jets toward the front. In the finishing scale breaker comprising a second descaler having a nozzle,
A counter injection header coupled to the first descaler, and
And a plurality of counter nozzles positioned along the length direction of the counter jet header and spraying a plurality of counter water jets having a continuous impact area on the steel plate toward the rear to block interference from the plurality of second water jets,
The total width of the collision areas of the plurality of counter waterjets on the steel sheet is equal to or greater than the total widths of the collision areas of the plurality of second waterjets, and the spraying force of each of the plurality of counter waterjets is each of the plurality of second waterjets. Descaler hot interference isolator of finishing scale breaker equal to or greater than the blowing force of The method of claim 1,
The collision area of each of the plurality of counter waterjets is thin and linear,
A descaler hot interference blocking device of a finishing scale breaker having a total width of the collision areas of the plurality of counter water jets greater than that of the steel sheet. The method of claim 2,
The collision area of each of the plurality of counter waterjets is parallel to the width direction of the steel plate, and two adjacent collision areas among the plurality of collision areas have an overlap area. The method of claim 2,
The plurality of counter nozzles are classified into a first group positioned at an upper left of the steel plate and a second group positioned at an upper right of the steel plate,
The plurality of counter nozzles belonging to the first group are offset so that the right end of the collision area faces rearward than the left end,
The plurality of counter nozzles belonging to the second group is a descaler hot interference blocking device of a finishing scale breaker in which a left end of the collision area is offset toward a rearward than a right end. The method of claim 4,
Offset angles of the plurality of counter nozzles belonging to the first group and offset angles of the plurality of counter nozzles belonging to the second group have the same value,
A descaler hot interference blocking device for a finishing scale breaker having an overlapping area in which two adjacent collision areas among the plurality of collision areas overlap along a transport direction of the steel plate. The method of claim 2,
The plurality of counter nozzles are positioned higher from the steel plate than the plurality of second nozzles, and are provided in a smaller number than the plurality of second nozzles,
The spray angle of each of the plurality of counter water jets is greater than the spray angle of each of the plurality of second water jets. The method according to any one of claims 1 to 6,
The plurality of counter nozzles and the plurality of second nozzles are configured to satisfy at least one of the following comparative equations (1) to (4). A descaler hot interference blocking device of a finishing scale breaker.

--- (One)

--- (2)

--- (3)

--- (4)
Here, θ _CL is the lead angle of the counter waterjet, θ _DL is the lead angle of the second waterjet,

Is the mass flow rate of the counter waterjet,

Is the mass flow rate of the second waterjet, V _C is the speed of the counter waterjet, V _D is the speed of the second waterjet, P _C is the pressure of the counter waterjet, P _D is the pressure of the second waterjet, ρ is the water Indicates the density. Including a plurality of nozzles positioned at a distance from each other along the transfer direction of the steel plate and installed to have a lead angle toward the front, and a spray header and a supply pipe supplying high pressure water to the plurality of nozzles, respectively. In the finishing scale breaker comprising the first, second, and third descaler,
A plurality of counter nozzles installed on each of the first and second descalers and installed to have a lead angle toward the rear, and a counter injection header supplying high pressure water to the plurality of counter nozzles,
The counter injection header installed in the first descaler is connected to a supply pipe included in the third descaler through a first connection pipe in which a first valve is installed,
The first valve is a descaler hot interference blocking device of a finishing scale breaker that is opened when the first and third descalers operate simultaneously. delete The method of claim 8,
The counter injection header installed in the second descaler is connected to a supply pipe included in the second descaler through a second connection pipe in which a second valve is installed. A descaler hot interference blocking device of a finishing scale breaker. The method of claim 10,
The first valve and the second valve are descaler hot interference blocking device of a finishing scale breaker that is opened when the first descaler, the second descaler, and the third descaler operate simultaneously. The method according to any one of claims 8, 10, and 11,
Of the remaining descalers, the total width of the collision area of the plurality of counter waterjets sprayed from the plurality of counter nozzles installed on the descaler of the previous row is the entire collision area of the plurality of waterjets sprayed from the plurality of nozzles included in the descaler of the rear row. Equal to or greater than the width,
The spraying force of each of the plurality of counter waterjets is equal to or greater than the spraying force of each of the plurality of waterjets.

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