JPS6327849Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to the structure of a nozzle header in a cooling device for hot steel plates, etc., and is aimed at uniformizing the jetting pressure and jetting amount of cooling water jetted from a large number of nozzles. The purpose is to

[Conventional technology]

By cooling heated steel materials at a predetermined cooling rate, it is possible to improve the material quality, such as increasing mechanical strength.

The continuous heat treatment method, in which the steel material is cooled while moving it, is excellent in improving productivity, and in particular, when continuously heat-treating high-temperature steel plates immediately after rolling on a rolling line, there is no need to reheat the steel material, resulting in energy savings. In addition to providing significant benefits in terms of improved productivity, material quality improvements can be expected through the effects of processing heat treatment.Recently, research on heat treatment technology on rolling lines has been actively conducted, and it is now possible to control a wide range of cooling capacity. There is a strong desire for a cooling device with excellent controllability.

Generally, in cooling devices such as hot steel plates, it is difficult to remove the cooling water that has accumulated on the top surface of the material to be cooled.
In many cases, a water film with a depth of 50 to 60 mm or more may be formed, and in order to efficiently cool the top surface of the material to be cooled, it is necessary to break through this water film and let the cooling water directly reach the surface of the material to be cooled. It must have a strong enough penetrating force to allow cooling, or it must have the ability to strongly agitate the cooling water that remains on the top surface of the cooled material.

On the other hand, cooling devices for heated steel plates, especially the top cooling device, must be installed as far away from the steel plate passing surface as possible to prevent damage to the cooling device due to deformation of the material to be cooled or damage to the material to be cooled. As mentioned above, in order to impart a strong penetrating force or stirring force to the cooling water ejected from the cooling device, it is necessary to increase the degree of convergence (density) of the cooling water near the drop point.

In addition, the cooling device for the upper surface of the steel plate needs to instantaneously stop the jetting of cooling water in order to accurately control the cooling end temperature.

Similarly, it is necessary to start spouting cooling water from all nozzles simultaneously and instantaneously.

A nozzle header for a cooling device that satisfies these numerous demands has a structure as shown in Figures 4 and 5 (for example, Japanese Utility Model Application No. 59-90727).
There is.

The conventional nozzle header 11 shown in FIG. 4 and FIG. An upper header 13 is liquid-tightly fixed to the top of the header 12 in a roof-like manner, and a pipe shape is formed by vertically penetrating the lower header 12 and fixed liquid-tightly, with the upper end protruding above the lower header 12 butting against the upper header 13. The upper wall of the upper header 13 is provided with a nozzle 14 having a circular shape and a through hole 17 that opens into a cooling water passage formed between the lower header 12 and the upper header 13.

The nozzle header 11 in this conventional example is configured such that cooling water is supplied into the lower header 12 via a cooling water supply pipe 18.

The cooling water supplied into the lower header 12 flows through the passage hole 17 between the passage formed between the lower header 12 and the upper header 13 and the gap 16 formed between the upper end of the nozzle 14 and the upper header 13. It enters the nozzle 14 through the nozzle 14 and is ejected from the nozzle outlet 15 at the lower end of the nozzle 14 toward the material to be cooled.

In the nozzle header 11 shown in FIG. 4 and FIG.
Each nozzle 14 is
As a result, a uniform amount of cooling water can be ejected from each nozzle 14 at all times.

[Problem that the invention attempts to solve]

As described above, the typical conventional nozzle header 11 shown in FIGS. 4 and 5 can exhibit excellent effects, but the dimensional accuracy of the inner wall of the upper header 13 and the chamfering of the upper end of the nozzle 14 are If the accuracy and the accuracy of the inner diameter of the nozzle 14 are high, the above-mentioned excellent effects can be achieved. However, the above-mentioned dimensions are not necessarily constant and may vary within predetermined tolerances. is the actual situation, and when welding the upper header 13 and the lower header 12, deformation occurs in the longitudinal direction of the nozzle header 11, so that the value of the gap 16 between the upper end of the nozzle 14 and the upper header 13 described above It has been difficult to make the amount of cooling water ejected from each nozzle 14 uniform for reasons such as the fact that the amount of cooling water may differ between each nozzle 14.

As described above, if there are variations in the amount of cooling water jetted from each nozzle 14, non-uniform cooling occurs in the cooling process of the hot steel plate, causing serious problems such as variations in material quality and deformation of the steel plate. Therefore, there was an urgent need for effective countermeasures.

[Means for solving problems]

The present invention was devised to eliminate the problems and drawbacks of the conventional example described above and to satisfy each requirement.The amount of cooling water spouted from each nozzle is set only by the dimensions of each nozzle. It is configured so that it can be done.

Hereinafter, the present invention will be explained with reference to FIGS. 1 to 3 showing one embodiment of the present invention.

The nozzle header 1 according to the present invention includes a lower header 2 which has a long cylindrical shape with both ends closed and is arranged with its axis substantially horizontal, and a nozzle header 2 which vertically passes through the lower header 2 and is spaced apart from each other. It has a structure in which a plurality of pipe-shaped communication pipes 4 are installed in a liquid-tight manner, and a groove having a width larger than the outer diameter of the communication pipes 4 and closed at both ends is formed on the lower surface over the entire length in the longitudinal direction. The upper header 3 is liquid-tightly fixed to the upper surface of the lower header 2 with the upper end of the communicating tube 4 protruding from the upper surface of the lower header 2 positioned in the groove, and the lower end of each communicating tube 4 A pipe-shaped nozzle 5 with an inner diameter smaller than the inner diameter of this communication pipe 4 attached to the pipe 4 is provided, and a plurality of through holes 7 are formed in the wall portion of the lower header 2 facing the groove of the upper header 3.
It has a configuration with a hole.

The cooling water supplied into the lower header 2 passes through the through hole 7, the communication pipe 4, and the nozzle 5 from within the lower header 2, and is ejected from the nozzle port 6. Among the passages, the nozzle 5 has the smallest flow passage area, and the flow passage area formed by the gap S formed between the upper end of the communication pipe 4 and the upper header 3 is that of this nozzle. 5 is set to be a value that is sufficiently larger than the flow path area formed by 5.

In addition, the nozzle 5 forms a nozzle port 6 which is a cooling water spout, and also ultimately sets the amount of cooling water spouted to the cooled material 10. This nozzle 5 can be attached to and detached from the communication pipe 4 in order to satisfy requests such as changing the force and easily combining items with more uniform processing dimensions. Advantageously, the configuration is such that it can be attached.

[Effect]

The nozzle header 1 according to the present invention has the above-mentioned configuration, that is, the nozzle 5, which is separate from the communication pipe 4, forms the part with the smallest flow area in the cooling water passage. Therefore, the amount of cooling water jetted from each nozzle 5 to the material to be cooled 10 is determined according to the flow path area of each nozzle 5 itself.

〔Example〕

In the embodiment shown in FIGS. 1 to 3, the lower header 2 and the upper header 3 are approximately connected to the cooled material 10.
A number of communicating pipes 4 are welded and fixed to the lower header 2 at regular intervals.

The nozzle 5 is attached to the lower end of the communication pipe 4 by a removable screw connection, and can be replaced as necessary.

The supply of cooling water to the nozzle header 1, that is, the supply of cooling water into the lower header 2, is achieved from a water supply source 9 via a plurality of water supply pipes 8 welded to the lower header 2.

If the nozzle 5 is configured to be detachably attached to the communication pipe 4, even if an abnormal situation occurs in the amount of cooling water spouted due to a change in the inner diameter of the nozzle 5 due to corrosion or thermal deformation of the nozzle 5, By replacing only this nozzle 5 with a normal nozzle 5, a normal and good cooling water jetting operation can be easily obtained.

In addition, the through holes 7 are arranged so that the cooling water can evenly flow into each communication pipe 4 from the inside of the lower header 2.
They are formed on the wall portions of the lower header 2 located between the respective communication pipes 4, respectively.

Since the gap S is a part where there is no need to apply a throttling action to the cooling water passing through, there is no need to accurately set the interval dimension between the upper header 3 and the upper end of the communication pipe 4. Therefore, high precision is not required in the dimensional accuracy of molding the upper header 3 or the dimensional precision of attaching the communication pipe 4 to the lower header 2, and the assembly and manufacturing of the entire nozzle header 1 is facilitated.

[Effect of idea]

As is clear from the above description, the nozzle header according to the present invention allows the amount of cooling water to be ejected to the material to be cooled to be accurately set using only the nozzle, and therefore the entire assembly and manufacturing process is easy.
Since the amount of cooling water ejected from each nozzle can be made more uniform, it is possible to achieve good cooling treatment, that is, heat treatment, of the material to be cooled.Furthermore, when the nozzles are attached removably, It exhibits many excellent effects, such as being able to easily and effectively deal with unauthorized deformation of the nozzle.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view showing one usage form of a nozzle header according to the present invention. Figure 2 shows the first
FIG. 3 is a side cross-sectional view of the nozzle header according to the present invention shown in the figure; FIG. 3 is a partial front sectional view of the nozzle header according to the present invention shown in FIG. Fourth
5 and 5 show an example of a conventional nozzle header, with FIG. 4 being a side sectional view and FIG. 5 being a partial front sectional view. Explanation of symbols, 1... Nozzle header, 2... Lower header, 3... Upper header, 4... Communication pipe, 5
...Nozzle, 7...Through hole.

Claims (1)

[Claims for Utility Model Registration] (1) A lower header 2 in the form of a long cylinder with both ends closed and arranged with its axis substantially horizontal.
, a plurality of pipe-shaped communication pipes 4 that vertically penetrate the lower header 2 and are installed at intervals in a liquid-tight manner, and have a width larger than the outer diameter of the communication pipes 4 and have both ends closed. It has a structure in which a groove is formed on the lower surface over the entire length in the longitudinal direction. It is composed of an upper header 3 fixed in a liquid-tight manner, and a pipe-shaped nozzle 5 having an inner diameter smaller than the inner diameter of the communicating pipe 4, which is attached to the lower end of the communicating pipe 4. A nozzle header formed by opening a plurality of through holes 7 in a wall portion of a lower header 2 facing the . (2) The nozzle header shown in claim 1 of the utility model registration claim, in which the nozzle 5 is detachably attached to the lower end of the communication pipe 4.