JP2564400Y2 - Laminar flow cooling device - Google Patents

Description

[Detailed description of the invention]

[0001]

[Industrial application field] The present invention relates to a hot rolling equipment,
The present invention relates to a laminar flow nozzle of a rolled material cooling device.

[0002]

2. Description of the Related Art Conventionally, in a rolled material cooling device of a hot rolling facility, a rod-shaped laminar flow water is dropped from a nozzle on a top surface of a running rolled material and collides with the same, and a cooling water film is formed on the surface thereof. A laminar flow cooling device that facilitates cooling by penetrating a vapor film generated between the cooling water film and the surface of the rolled material is often used.

FIG. 6 shows an example of a nozzle of a conventional laminar flow cooling device.
Are arranged in the longitudinal direction of the pipe through the lower portion of the header 52, and the cooling water is injected into the header 52 to fill the header 52, so that the laminar flow water 11 is dropped from the nozzle 51 onto the upper surface of a rolled material (not shown). Cooling.

FIG. 7 shows an example of a nozzle of a laminar flow cooling device disclosed in Japanese Patent Publication No. 55-19294 and Japanese Patent Publication No. 55-19295 "Steel plate cooling device". The nozzles 61 are arranged in a row above the header 62, and the cooling water filled in the header 62 is cooled by dropping from the nozzle 61 as laminar flow water 11 onto the upper surface of a rolled material (not shown) by the siphon effect.

Then, the laminar flow water 11 is turned on and off.
In order to speed up the response of F, the nozzle 61
7 is formed and mounted so as to be positioned on the same plane as the highest portion of the mounting portion of each nozzle 61 to the header 62 or above it, and a small hole 65 for sucking air is formed at the top of the nozzle 61. It was established.

[0006]

Among the above-mentioned conventional devices, in the device shown in FIG. 6, the water level in the header 52 drops below the upper end surface of the nozzle 51 even after the water supply to the header 52 is turned off. Until the laminar flow water 11 flows out of the nozzle 51, the turning off is delayed. On the other hand, when the water injection is turned on, the laminar flow water 11 does not flow out from all the nozzles 51 arranged in a row until the cooling water fills the inside of the header 52. Yes, so this type is rarely used.

Further, in the apparatus shown in FIG. 7, since the nozzle 61 has an inverted U-shape, it is difficult to clean the scale and the scale that are gradually fixed to the inner surface of the nozzle, and the outflow of the lamina flow water 11 is difficult. There is a problem that the cooling ability of the rolled material is reduced due to being hindered.

An object of the present invention is to provide a new laminar flow cooling device which solves the above-mentioned disadvantages.

[0009]

In order to achieve the above object, a laminar flow cooling device according to the present invention comprises a plurality of nozzles mounted on a header arranged in parallel in a horizontal direction above a traveling hot-rolled material. In a laminar flow cooling device that cools the rolled material by dropping the laminar flow water on the upper surface of the hot-rolled material, the straight tubular nozzles are penetrated up and down the header, and an orifice is provided at the upper end of each nozzle. The nozzle is detachably mounted, and the nozzle is fixed to the header at the lower penetrating portion and sealed, and the upper penetrating portion forms a water passage between the header and the upper portion, and the nozzle is located above the water passage and the orifice. A water chamber that can be opened for each header is provided independently above each header, and a small hole is formed above each water chamber.

[0010]

When cooling the hot rolled material by the laminar flow cooling device of the present invention, the valve is opened and cooling water is injected from the common header to each header.

[0011] Due to the positive pressure at the time of the water injection, air quickly escapes from the small hole of each water chamber provided above each header, and each water chamber is easily filled with cooling water. In the case of the present invention, the water chamber is provided independently for each nozzle, and the volume thereof can be minimized, so that the time for the outflow and filling of water in the water chamber is short, and the response is good. In addition, variation in responsiveness of each nozzle is small due to the water chamber provided for each nozzle.

The cooling water passes through the orifice mounted on the upper end of the nozzle, and drops from the lower end of each nozzle as laminar flow water onto the upper surface of the traveling hot rolled material, and is dispersed on the upper surface of the rolled material. To form a cooling water film, and penetrate a steam film generated between the cooling water film and the hot-rolled material to directly collide with the surface to promote cooling.

At this time, the water chamber has a slight positive pressure, but the orifice restricts the passage of the cooling water, so that the upper part in the nozzle has a negative pressure.

Further, since a slight positive pressure is generated at the discharge port at the lower portion of the nozzle, the flow velocity of the discharge water is suppressed to a low value, resulting in rod-shaped laminar flow water, which is a collision with little scattering on the surface of the hot-rolled material. A large cooling effect can be obtained.

Further, by replacing the orifice mounted on the upper end of the nozzle with one having a different hole diameter, it is possible to adjust the amount of the lamina flow water that falls.

When the cooling of the hot-rolled material is stopped, if the water supply to the header is turned off, the water chamber becomes negative pressure due to the gravity of the cooling water in the nozzle. , Only the cooling water in the water chamber and the nozzle falls, and the laminar flow water stops immediately.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be specifically described below with reference to the drawings. 1 is a perspective view of a laminar flow cooling device according to a first embodiment of the present invention, FIG. 2 is an enlarged front view of a main part of FIG. 1, and FIG. 3 is a sectional view taken along line III-III of FIG.

In these figures, 1 is a nozzle,
The lower penetrating portion is fixed to the header 2 through the upper and lower portions of the header 2 horizontally arranged above the running hot rolled material 10 in the horizontal direction, and the upper penetrating portion passes between the upper opening of the header 2. A water portion 2a is formed.

A cap-shaped orifice 3 is detachably screwed to the upper end of the nozzle 1 formed in a straight tubular shape.

A nozzle 4 has a small hole 5 formed in the upper part thereof. The nozzle 4 is integrally fixed above the opening of the header 2 and a lid 6 is provided on the inner surface of the upper part. Is screwed.

Reference numeral 7 denotes a water chamber provided above the water passage 2a and the orifice 3, and the nozzle 1 protrudes above the header 2.
, Orifice 3, nozzle 4, and lid 6.

Each of the headers 2 is arranged in a row on the common header 8 with the axis thereof in the width direction of the hot-rolled material 10 in the same horizontal plane. Reference numeral 9 denotes a valve for turning on / off the cooling water provided in the middle of the common header 8.

Next, the operation of the apparatus according to the present embodiment will be described. When cooling the traveling hot-rolled material 10, the valve 9 is turned on, and cooling water is injected from the common header 8 into each of the headers 2. Due to the positive pressure, the air in the water chamber 7 is immediately expelled from the small holes 5 to fill the water chamber 7 with the cooling water.

In this case, since the small hole 5 has a very small diameter of 2 to 4 mm and the cooling water injection pressure is as low as 100 to 300 mmAg, the amount of water leaking from the small hole 5 is extremely small.

The cooling water filled in the water chamber 7 passes through the orifices 3 and enters the respective nozzles 1, becomes rod-shaped laminar flow water 11, falls on the traveling hot-rolled material 10, and collides with the upper surface thereof.

At this time, since the pressure inside the nozzle 1 is reduced by the orifice 3, the energy of the collision of the laminar flow water 11 becomes a drop from the lower end of the nozzle 1 to the upper surface of the hot-rolled material 10. And the impact force are constant and stable.

The laminar flow water 11 is used for hot-rolled material 1
The cooling water film is formed by dispersing the cooling water film on the upper surface of the hot-rolled material 10 and directly collides with the surface through a vapor film generated between the cooling water film and the hot-rolled material 10 to promote the cooling.

The amount of the lamina flow water 11 falling can be adjusted by the diameter of the orifice 3. For example, when the laminar flow water 11 at the center in the plate width direction is to be dropped more than at both ends in the plate width direction, the orifice 3 at the center in the plate width direction is larger than the hole diameter of the orifice 3 at both ends. Replace with something.

When the cooling of the hot-rolled material 10 is stopped,
When the supply of the cooling water to the header 2 is stopped by turning off the valve 9, the water in the water chamber 7 also becomes negative pressure due to the gravity of the cooling water in the nozzle 1, and the air is sucked through the small holes 5. The cooling water in the nozzle 1 immediately drops, and the cooling water in the header 2 stops at the level of the upper surface of the orifice 3.

When cleaning the inside of the nozzle 1, the lid 6 and the orifice 3 are detached.

4 and 5, which are the second embodiment of the device of the present invention. FIG. 4 is a plan view of the device, and FIG. 5 is a sectional view taken along the line IV-IV of FIG. is there.

In the case of the present embodiment, the nozzle 1
Are arranged in two rows, and since the number of nozzles 1 to be installed increases, the amount of cooling water increases, and a laminar flow cooling device having a large cooling capacity can be obtained.

The other constructions and operations are the same as those in the first embodiment, and a detailed description thereof will be omitted.

[0034]

As described above, according to the laminar flow cooling device of the present invention, the following effects can be obtained. (1) A straight tubular nozzle is protruded above the header, and an orifice is removably attached to the upper end so that an independent water chamber for each header above each header can be opened. Of these, only the necessary nozzles can be easily cleaned, and the cooling water in the nozzles becomes negative pressure by the orifice. It is possible to obtain the laminar flow water which is held down. Further, by replacing the orifice with one having a different hole diameter, it is possible to easily adjust the drop amount of the laminar flow water.

(2) When a water chamber is provided above the nozzle and a small hole is formed in the upper part thereof, when water injection into the header is turned ON, the air above the nozzle immediately escapes and the cooling water is supplied to the water chamber. Is filled, so that the outflow of the lamina flow water can be started earlier. Also, when water injection is turned off,
A negative pressure is generated in the water chamber, air is immediately sucked from the small holes, and only the cooling water in the water chamber and in the nozzle flows from the nozzle, so that the outflow of the laminar flow water can be stopped earlier.

[Brief description of the drawings]

FIG. 1 is a perspective view of a laminar flow cooling device according to a first embodiment of the present invention.

FIG. 2 is an enlarged front view of a main part of FIG.

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

FIG. 4 is a plan view of a laminar flow cooling device according to a second embodiment of the present invention.

FIG. 5 is a sectional view taken along the line IV-IV in FIG. 4;

FIG. 6 is a sectional view showing an example of a nozzle of a conventional laminar flow cooling device.

FIG. 7 is a sectional view showing another example of a nozzle of a conventional laminar flow cooling device.

[Explanation of symbols]

 Reference Signs List 1 nozzle 2 header 2a water passage 3 orifice 4 nozzle 5 small hole 6 lid 7 water chamber 8 common header 10 hot rolled material 11 laminar flow water

Claims (1)

(57) [Scope of request for utility model registration] 1. A bar-shaped laminar flow water is dropped from a number of nozzles attached to headers arranged in parallel in a horizontal direction onto an upper surface of the hot-rolled material, and the material to be rolled is over the hot-rolled material to be run. In the Namina flow cooling device for cooling, the straight tubular nozzles penetrate vertically above and below the header, and an orifice is removably attached to the upper end of each nozzle, and the nozzles are fixed to the header at the lower penetration portion. And the upper penetration portion forms a water passage between the header and the header, and a water chamber that can be opened for each header is provided independently on the header above the water passage and the orifice. A laminar flow cooling device, wherein a small hole is formed in each of the water chambers.