JPH0522334Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a hot steel plate cooling device for cooling a hot steel plate processed in a hot rolling line.

[Conventional technology] Conventionally, temper cooling, which combines controlled rolling with forced cooling immediately after rolling, has been used in the manufacturing process of thick steel plates to reduce alloying elements, save heat, develop new steel types, etc. ing.

The cooling equipment for this refining cooling must have characteristics that can be adapted to the multi-product manufacturing that is a feature of the thick plate manufacturing process, and must be online equipment that can be installed immediately after the rolling mill or immediately after the hot straightening machine. has become an essential condition.

In addition to these conditions, it not only has excellent cooling performance and controllability, and uniform cooling characteristics for the entire material to be cooled, but also the ability to evacuate from the line during sheet threading, which does not require cooling, to maintain the entire cooling system. Since it is installed on the most important line in the production process, it is required to have a compact structure with excellent maintainability.

FIG. 5 is a perspective view of the shield 17 viewed from the nozzle side, in which a rim 24 is provided protruding from the end of the seal plate portion 23 that slides on the surface where the opening 16 of the apron 15 is formed, and reinforcing ribs 25 are arranged. are doing. Reference numeral 26 denotes an elastic brush made of, for example, rubber or wire, which is fixed to the rib 25 by a mounting plate 27 and bolts 28.

That is, the shield 1 of the part opposite to the pass line
A brush 26 is disposed at 7, and this brush 26 is cut 26A in the middle so that it can be opened and closed in the forward and backward direction of the shield 17, and when the shield 17 moves as shown in FIG. 6, the nozzle 11, 12 relatively passes through this brush 26, and the shield 1
It is possible to prevent the cooling water from dissipating in the direction of the material M from the nozzles 11 and 12 at the positions covered by the nozzles 7.

[Problems to be solved by the invention] In the conventional structure, by providing the shield 17, cooling water is not sprayed from the nozzles 11 and 12 to the edges of the material M, but cooling water to the nozzles 11 and 12 is Because the water supply is not cut off,
Nozzle 11, 1 at a position shielded by shield 17
After the cooling water from 2 collides with the shield 17, it loses its destination and flows along the shield 17 to the material M side and the opposite side.

For the purpose of suppressing or preventing the flow of cooling water toward the material M side, a brush is attached to the shield in a single layer on the material M side in the advancing/retracting direction, as shown in FIGS. 5 and 6. However, the cooling water used to cool material M generally has a water flow rate of 30 to 100/min per nozzle and a pressure of 2 to 3 kg/cm ² , so a single brush cannot stop the flow along the shielding body. It is then diffused into the material M.

Since the cooling water diffused into the material M causes a supercooling phenomenon, it becomes impossible to obtain a uniform cooling pattern. As a result, defects in shape and material may occur. The material of the brush should also be selected in consideration of heat resistance, water resistance, elasticity, durability, etc.

The present invention provides a steel plate cooling device that prevents overcooling of the material edge due to variations in plate width.

[Means for Solving the Problems] The present invention is a hot steel plate cooling device equipped with nozzles for spouting cooling water above and below a hot steel plate pass line,
Between the nozzle and the hot steel plate passing through, a pair of shields for shielding cooling water from the nozzle to the hot steel plate are arranged on both ends of the pass line, and the shields are spaced at the same distance as the nozzle interval, This hot steel plate cooling device is characterized by having double brushes made of stainless steel wire and a shield configured to be movable in the width direction of the steel plate.

Hereinafter, the present invention will be explained based on the drawings.

FIG. 1 is a cross-sectional view in the pass line direction of a steel plate cooling device according to the present invention, and FIG. 2 is a cross-sectional view taken along the - line in FIG. 1.

In the figure, 15 is an apron with a concave cross section fixed to the upper and lower frames 1 and 2, and the upper and lower nozzles 11 and 1
A plurality of openings 16 are provided aligned with the nozzle axis so that the cooling water from 2 can be ejected in the direction of the material M.

17 is a shield movable in the direction perpendicular to the pass line inside the upper and lower aprons 15; 18 is a screw shaft rotatably disposed on the upper and lower frames 1 and 2 by a bearing 19; and 20 is the screw shaft 18.
This is an electric motor for driving a shield which rotates the shield through a coupling 21.

The shield 17 includes a support portion 22 that is screwed onto the screw shaft 18, and by rotating the screw shaft 18 in forward and reverse directions by the shield driving electric motor 20, the shields 17 are moved in directions perpendicular to the pass line toward or away from each other. Move to.

FIG. 3 is a perspective view of the shield 17 viewed from the nozzle side, in which a rim 24 is provided protruding from the end of the seal plate portion 23 that slides on the surface where the opening 16 of the apron 15 is formed, and a reinforcing rib 25 is provided. It is placed.

The shield 17 has a brush 26A on the surface facing the material M, a brush 26B at a distance from the nozzle, and a mounting plate 27 and bolts 2 on the rib 25.
It is attached by 8. Brushes 26A and 26B
The material used is 0.12mm thick stainless steel wire, taking into account its heat resistance, water resistance, elasticity, and durability.

That is, the shield 1 of the part opposite to the pass line
Brushes 26A, 26B are arranged doubly on the fourth brush 7, and these brushes 26A, 26B are cut 29 in the middle so that they can be opened and closed in the direction of movement of the shield 17.
As shown in the figure, when the shield 17 moves, the nozzles 11 and 12 relatively pass through these brushes 26A and 26B at the cutting position 29.

In the steel plate cooling device having the above configuration, when the material M is passed through, cooling water is injected from the upper and lower nozzles 11 and 12 through the opening 16 of the shield 17, and the material M is
Cool with a cooling pattern that requires

At the edge of the material M, overcooling is prevented by blocking cooling water with a shield 17. Furthermore, the nozzle 1 at a position shielded by the shield 17
After the cooling water from 1 and 12 collides with the shield 17, it flows along the shield 17 to the material M side and the opposite side. As shown in FIG. 7, the flow toward the material M side is weakened by a brush 26B mounted on the inside, and then dammed by a brush 26A to prevent it from dispersing to the material M.

If the width of the material M changes during this sheet passing, the shield drive electric motor 20 is driven to move the left and right shields 17 in accordance with the width of the sheet, so that the edges of the material M are supercooled. The cooling water from the necessary number of nozzles 11 and 12 is blocked to prevent this from occurring.

By providing a plurality of shields 17 in the pass line direction, the degree of supercooling of the edge of the material M can be freely adjusted, and furthermore, by rotating the screw shaft 18, the supercooling prevention time can be easily determined. Thus, it is possible to perform the heat treatment reliably.

FIG. 8 is a comparison chart between the present invention and a conventional example.
As shown in the figure, the average deviation of plate temperature after water cooling is 15
℃ to 5℃, and the effect is remarkable.

[Effects of the invention] The steel plate cooling device according to the invention has a structure in which the shield can be moved forward and backward freely, and cooling water is spouted onto the material only from the nozzles necessary for uniform cooling even if the width of the material changes. At the same time, the cooling water shielded by the shield is prevented from being dissipated into the material after flowing along the shield, preventing overcooling of the edge of the material and maintaining a normal cooling pattern. This has the advantage of being able to be cooled down and also to ensure reliable shape control.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the steel plate cooling device according to the present invention viewed from the pass line direction, and Fig. 2 is a - of Fig. 3.
Fig. 3 is a partial perspective view of a shield in the steel plate cooling device according to the present invention, and Fig. 4 shows how the shield blocks cooling water from unnecessary nozzles in the steel plate cooling device according to the present invention. A sectional view, and FIG. 5 is a partial perspective view of a shield in a steel plate cooling device according to the prior art.
FIG. 6 is a cross-sectional view showing how a shield cuts off cooling water from unnecessary nozzles in a steel plate cooling device according to the prior art, FIG. 7 is an explanatory diagram showing the flow of cooling water between the present invention and the prior art, and FIG. FIG. 8 is a chart showing a comparison between the present invention and the prior art, showing the temperature deviation inside the plate after water cooling. 1, 2... mount, 3, 4... roll, 5, 6...
... Header, 7... Support, 11, 12... Nozzle,
15... Apron, 16... Opening, 17... Shield, 18... Screw shaft, 19... Bearing, 20
... Shield drive electric motor, 22 ... Support part, 23
...Seal plate part, 26A, B...Stainless steel brush, 27...Brush support part, 28...Brush mounting part, 29...Brush gap.

Claims (1)

[Scope of utility model registration request] A cooling device for a hot steel plate that is equipped with nozzles for spouting cooling water above and below a hot steel plate pass line, and a shield that blocks cooling water from the nozzle to the hot steel plate between the nozzle and the hot steel plate passing through. A pair of brushes made of stainless steel wire are placed on the shield at the same distance as the nozzle spacing, and the shield is configured to move forward and backward in the width direction of the steel plate. A thermal steel plate cooling device characterized by: