JPH0910817A - Rolling oil spray header and its use - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a spray header for spraying rolling oil onto a steel plate rolled by a rolling mill and a method for using the spray header. A double-pipe structure having an inner cylinder 2 forming a rolling oil supply chamber 9a and an outer cylinder 1 rotatably fixed to the inner cylinder 2 is provided, and a plurality of nozzles are planted on the outer peripheral surface of the outer cylinder 1 with different numbers of nozzles. Nozzle rows 5a to 5d are provided, and the spray header 20 is configured so that only one of the nozzle rows 5a to 5d can selectively communicate with the rolling oil supply chamber 9a via the nozzle spray chamber 13a. This makes it possible to spray rolling oil according to the width of the steel plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spray header for spraying rolling oil onto a steel sheet rolled by a rolling mill and a method of using the same.

[0002]

2. Description of the Related Art Conventionally, when a steel sheet is rolled by a cold rolling mill or a hot rolling mill (hereinafter, simply referred to as a rolling mill), a rolling oil is used on a surface of the steel sheet or a roll and a spray header having a plurality of nozzles is used. Need to be sprayed and applied. At this time, it is a condition that the rolling oil is sprayed in a range wider than the strip width.

FIG. 9 shows an example of the application of rolling oil, in which a spray header S is provided above the steel plate P which is rolled by the rolling mill M in the direction of arrow F in the width direction of the surface.
Rolling oil is applied from the nozzle through the nozzle N. FIG. 10 shows the width direction of the spray header S, but the change of the spray width W is about twice the planting pitch p of the nozzle N.

However, it is necessary to minimize the surplus of the spray width with respect to the plate width in terms of the amount of rolling oil consumed, that is, the unit consumption. Therefore, the number of nozzles N on both ends of the spray header S is 2 to 3. It is general that a valve V is attached so that it can be opened and closed according to the plate width of the steel plate P to be rolled.

[0005]

However, the above-mentioned conventional method has the following problems. (1) As described above, the spray width W by opening and closing the nozzles N on both ends of the spray header S can be changed only every two times the planting pitch p of the nozzles N.
The variation of the width of the rolled steel plate P depends on the planting pitch p.
The spray width W is much finer than the above, and the surplus portion of the spray width W is increased accordingly, causing a loss of rolling oil. In order to deal with this, it is conceivable to increase the number of nozzles N to be planted and change the spray width W at a fine pitch, but if this is done, the number of switching steps will increase and the spray width switching device will become complicated and impractical. is there.

(2) The spray of rolling oil from the nozzle N is
Generally, in order to reduce the difference in the density of the coating amount on the plate surface,
As shown in 11 (a), the spray pattern is applied to the plate surface in at least three layers.
In such a method, as shown in FIG. 11 (b), at least 13% of so-called ineffective rolling oil (hatched portion) that is not applied to the steel plate P is present. That is, a certain plate width x
Even if the spray widths are matched with each other, a loss of 13% occurs, and when the plate width is narrower than this, the loss is further increased.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rolling oil spray header and a method of using the same, which advantageously solves the above problems of the prior art.

[0008]

DISCLOSURE OF THE INVENTION The present invention is a spray header for spraying rolling oil onto a steel plate rolled by a rolling mill, and an inner cylinder forming a rolling oil supply chamber and a rotatably fixed to the inner cylinder. The outer cylinder has a double-tube structure, and a plurality of nozzle rows with different numbers of nozzles are provided on the outer peripheral surface of the outer cylinder, and any one row of the nozzle rows is an inner surface of the outer cylinder and the inner cylinder. A rolling oil spray header characterized by being selectively communicable with the rolling oil supply chamber of the inner cylinder via a nozzle spray chamber defined by the outer surface of the cylinder.

It should be noted that nozzles having a larger spray flow rate than the other nozzles may be planted at both ends of the nozzle row, or the spray flow rate in the center of the width of the steel plate may be provided at both ends of the nozzle row. The nozzle may be constructed by implanting a nozzle having a flow rate pattern that reduces Further, it is preferable that ejectors for circulating the rolling oil supplied to the nozzle spray chamber to the rolling oil supply chamber are attached to both ends of the inner cylinder.

The present invention is also a method of using a rolling oil spray header, characterized in that a nozzle row for spraying rolling oil is selected according to the plate width of the rolled steel sheet. In addition, it is preferable that the cleaner fluid be supplied to the nozzle row that does not spray the rolling oil through the nozzle cleaning chamber defined by the inner surface of the outer cylinder and the outer surface of the inner cylinder.

[0011]

[Operation] According to the present invention, the spray header for spraying rolling oil has a double pipe structure of an inner cylinder and an outer cylinder, and a plurality of nozzle rows with different numbers of nozzles are planted on the outer peripheral surface of the outer cylinder. Since it is arranged, by rotating the outer cylinder, a desired nozzle row can be easily selected and used according to the plate width of the steel plate to be rolled.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a front view showing an embodiment of a spray header according to the present invention, FIG. 2 is a side view taken along the line AA, FIG. 3 is a sectional view taken along the line BB of FIG. 2, and FIG. C-
It is a C arrow line sectional view. In these figures, 1 is an outer cylinder forming a header, 2 is an inner cylinder mounted on the inner surface of the outer cylinder 1,
Reference numeral 3 is a flange for rotatably fixing the outer cylinder 1 to the inner cylinder 2, and an O-ring 4 is interposed therebetween.

Nozzles 5a, 5b, 5c and 5d are attached to the surface of the outer cylinder 1 at intervals of 90 °. The pitch p of these nozzle rows 5a, 5b, 5c, 5d is set to the same value, and their nozzle planting lengths L are L ₁ , respectively so that their center points coincide with the plate width center position. L ₂ , L ₃ , and L ₄ (however, in this embodiment, L ₁ > L ₂ > L ₃ > L ₄ ). As a result, the numbers of planted nozzle rows 5a, 5b, 5c, 5d are different from each other n ₁ , n ₂ , n ₃ , n ₄ (however, in this embodiment, n ₁ > n ₂ > n ₃ > n ₄ ) Is said.

6 is a rolling oil supply port for supplying a rolling oil which is an emulsion of oil and water, 7 is a cleaner fluid supply port for supplying a cleaner fluid such as water or air, and 8 is an inner surface of the inner cylinder 2 and its axis. This is a partition plate that partitions the rolling oil supply chamber 9a and the cleaner fluid supply chamber 9b horizontally in the longitudinal direction. 10a, 10b
Is a rolling oil supply passage provided on the rolling oil supply chamber 9a side of the inner cylinder 2, and 11 is a cleaner fluid supply passage provided on the cleaning fluid supply chamber 9b side of the inner cylinder 2. Reference numeral 12 is a seal member that defines the inner surface of the outer cylinder 1 and the outer surface of the inner cylinder 2 into a nozzle spray chamber 13a and a nozzle cleaning chamber 13b. An ejector 14 blows rolling oil into the rolling oil supply chamber 9a from both ends.

Therefore, when applying the rolling oil using the spray header 20 constructed as described above, first, the outer cylinder 1 is rotated according to the plate width of the steel plate P rolled by the rolling mill. A nozzle array suitable for the plate width is selected, and rolling oil is supplied from the rolling oil supply ports 6 and 6. Assuming now that the nozzle row 5a is selected, as shown in FIG. 5, the rolling oil O fed from the rolling oil supply ports 6 and 6 is ejected by the ejector 14,
It is blown into the rolling oil supply chamber 9a by 14 and is further sprayed from the rolling oil supply passage 10a through the nozzle spray chamber 13a to the steel plate surface from the nozzle row 5a. The excess rolling oil O in the nozzle spray chamber 13a is ejected by the ejectors 14, 14
By the suction effect of the rolling oil supply chamber 9a through the rolling oil supply passages 10b formed at both ends of the nozzle spray chamber 13a.
The properties of the rolling oil are made uniform by the stirring action generated at that time.

For the other nozzle rows 5b, 5c, 5d which are not selected at this time, the cleaner fluid F supplied from the cleaner fluid supply port 7 is the cleaner fluid provided in the cleaner fluid supply chamber 9b. The nozzle fluid is supplied from the nozzle cleaning chamber 13b to each nozzle row through the supply passage 11, the rolling oil in the nozzle cleaning chamber 13b and each nozzle N is replaced with the cleaner fluid, and the cleaner fluid F waits in a filled state. .

An example of the spray pattern of the steel plate P having the plate width x at this time is shown in FIG. 6 (a), and the coating density at that time is shown in FIG. 6 (b). Here, the nozzle planting length L of the selected nozzle row 5a is L ₁ having a value such that the spray width of the nozzle at the end of the nozzle row matches the plate width x with respect to the plate width x. . As a result, there is almost no so-called ineffective rolling oil that is not applied to the steel sheet P.

At this time, the same action and effect as described above can be obtained even if nozzles having a large spray flow rate are attached to the nozzles at both ends of the nozzle row 5a according to the spray pattern. That is, for example, when the spray patterns overlap three times, nozzles having a flow rate three times that of the other nozzles are planted at both ends of the nozzle row 5a. In addition, the nozzles N to be planted at both ends of the nozzle row 5a,
If a so-called coating density gradient type having a flow rate pattern in which the spray flow rate decreases in the plate width center direction as shown in FIG. 7 (a) is used, as shown in FIG. 6 (c), It is possible to reduce the amount of ineffective rolling oil that flows out without being applied to the surface. The nozzle N shown in FIG. 7 (b) has a normal coating density flat type flow pattern in the plate width direction.

Here, supplementing the nozzle planting length L of the nozzle row of the spray header 20 of the present invention, the plate width x of the steel plate P to be rolled changes between the maximum width and the minimum width, and the change. Is not uniform. For example, FIG. 8 shows the configuration of the plate width of the rolled steel plate in the cold tandem mill for rolling the tin plate, which is concentrated in a specific plate width region as shown in this figure. Therefore, the nozzle planting length L of the nozzle row is determined according to this concentrated portion. When the nozzle row is divided into, for example, four sections 5a, 5b, 5c, and 5d, the nozzle row 5a has L ₁ = 1200 mm, the nozzle row 5b has L ₂ = 1000 mm, and the nozzle row 5c has L ₃ = 850 m.
By setting the nozzle planting length L to m and the nozzle row 5d to L ₄ = 800 mm, the width can be switched efficiently.

Also, the planting pitch p of the nozzle N does not necessarily have to be the same value. For example, in the case of the nozzle rows 5a and 5b, it is 100 mm, and the number of nozzles is 10 and 7, respectively. Appropriate. In addition, in the case of the nozzle rows 5c and 5d, the number of nozzles is 7, and
The planting pitch p of the nozzle N is 94.4 mm and 8 respectively.
8.9mm is recommended.

When the planting pitch p is different in this way,
The spray amount on the plate surface per unit plate width of the steel plate P is different. That is, the coating density is higher in the nozzle rows 5c and 5d than in the nozzle rows 5a and 5b.
Since the excess rolling oil is applied to the plate surface, in this case, the problem of the excess amount can be solved by adjusting the concentration of the rolling oil, for example.

Rolling oil was sprayed onto a steel plate having the plate width configuration shown in FIG. 8 using a nozzle header having four nozzle rows according to the present invention, and the consumption amount and usage efficiency of rolling oil were measured. . Here, the nozzle planting length L of the four nozzle rows is
No. 1 is 1200 mm, 1000 mm, 850 mm, and 800 mm, respectively, and nozzles having a spray flow rate three times as large as that of the central nozzle are used as the present invention example 1, and both ends have the above-mentioned FIG. 6 (c). Inventive Example 2 uses a nozzle having the flow rate pattern shown in Table 1, and the results are shown in Table 1.

[0023]

[Table 1]

The rolling oil consumption in this table is an index when the value of the conventional spray header having a nozzle planting length L of 1200 mm and the conventional example in which no switching is performed by the plate width is 100. It was done. In the comparative example, the nozzle planting lengths L are 1200 mm, 1000 mm, and 800 m, respectively.
The four nozzle headers of m and 600 mm are individually replaced according to the plate width, and the nozzles at both ends are stopped one by one according to the plate width.

As is apparent from Table 1, it is needless to say that all of the examples of the present invention are superior to the conventional examples in both rolling consumption and use efficiency compared with the comparative examples. Recognize. Although not shown in Table 1, it goes without saying that the time required to switch the nozzle rows is greatly shortened according to the plate width of the steel plate.

[0026]

As described above, according to the present invention,
A spray header for spraying rolling oil has a double pipe structure of an inner cylinder and an outer cylinder, and a plurality of nozzle rows with different numbers of nozzles are arranged on the outer peripheral surface of the outer cylinder to rotate the outer cylinder. As a result, the desired nozzle row can be easily selected and used according to the plate width of the steel plate to be rolled, so that it is possible to suppress the consumption of rolling oil and improve its use efficiency, and thereby, The cost of oil can be reduced. Further, the time required for switching the nozzle row can be shortened, which contributes to the improvement of the operating rate.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a spray header according to the present invention.

FIG. 2 is a side view taken along the line AA of FIG. 1;

FIG. 3 is a sectional view taken along the line BB of FIG. 2;

FIG. 4 is a sectional view taken along the line CC of FIG. 3;

FIG. 5 is a cross-sectional view illustrating the flows of rolling oil and cleaner fluid.

FIG. 6 is an explanatory diagram showing (a) nozzle arrangement, (b) one example of spray pattern, and (c) another example of spray pattern of the spray header used in the present invention.

7A and 7B are explanatory diagrams of (a) coating density gradient type and (b) coating density flat type showing flow rate patterns of nozzles used in the present invention.

FIG. 8 is a distribution diagram showing a configuration of a plate width of a rolled steel plate.

FIG. 9 is a schematic diagram showing a conventional example in which rolling oil is sprayed on a steel plate.

FIG. 10 is a schematic view showing a conventional spray header.

FIG. 11 is an explanatory view of (a) a spray header and (b) a spray pattern in a conventional example.

[Explanation of symbols]

 1 Outer cylinder 2 Inner cylinder 3 Flange 4 O-ring 5a, 5b, 5c, 5d Nozzle row 6 Rolling oil supply port 7 Cleaner fluid supply port 8 Partition plate 9a Rolling oil supply chamber 9b Cleaner fluid supply chamber 10a, 10b Rolling oil supply passage 11 Cleaner fluid supply passage 12 Seal member 13a Nozzle spray chamber 13b Nozzle cleaning chamber 14 Ejector 20 Spray header N Nozzle P Steel plate O Rolling oil F Cleaner fluid

Claims (6)

[Claims] 1. A spray header for spraying rolling oil onto a steel sheet rolled by a rolling mill, comprising an inner cylinder forming a rolling oil supply chamber and an outer cylinder rotatably fixed to the inner cylinder. The outer cylinder has a tubular structure, and a plurality of nozzle rows with different numbers of nozzles are provided on the outer peripheral surface of the outer cylinder, and any one of the nozzle rows is defined by the inner surface of the outer cylinder and the outer surface of the inner cylinder. A rolling oil spray header, which is selectively communicable with the rolling oil supply chamber of the inner cylinder via a nozzle spray chamber. 2. The rolling oil spray header according to claim 1, wherein nozzles having a larger spray flow rate than other nozzles are planted at both ends of the nozzle row. 3. The rolling oil spray header according to claim 1, wherein nozzles having a flow rate pattern in which the spray flow rate decreases in the plate width center direction of the steel plate are planted at both ends of the nozzle row. 4. The ejector for circulating the rolling oil supplied to the nozzle spray chamber to the rolling oil supply chamber is attached to both ends of the inner cylinder. Rolling oil spray header described in. 5. The method of using a rolling oil spray header according to claim 1, wherein a nozzle row for spraying rolling oil is selected according to the width of the rolled steel sheet. . 6. A nozzle array that does not spray rolling oil,
6. The method of using a rolling oil spray header according to claim 5, wherein the cleaner fluid is supplied through a nozzle cleaning chamber defined by an inner surface of the outer cylinder and an outer surface of the inner cylinder. .