JPH023827Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a spray nozzle device for removing water accumulated on the upper surface of a steel plate, remaining scale, dust, etc. The purpose is to effectively treat cooling water that remains on the material, remaining scale, dust, etc.

In recent years, research has been actively conducted on so-called controlled cooling methods, which produce steel sheets with excellent material properties by accelerating online cooling of steel sheets after controlled rolling.

This involves injecting pressurized water onto the front and back surfaces of a steel plate immediately after rolling, and water-cooling the steel plate to around 500°C at a predetermined cooling rate.

After the cooling water injected onto the top surface of the steel plate collides with the steel plate, it flows over the surface of the steel plate in the widthwise or advancing direction of the steel plate, and then falls downward from the edge of the steel plate, which causes the following problems. occurs.

(1) On the inlet side of the cooling system, the cooling water that remains or flows on the top surface of the steel plate flows out to the upstream side of the cooling start position, which not only lowers the steel plate temperature at the cooling start position and makes it impossible to perform the prescribed heat treatment. , the temperature of the steel plate before the cooling start position becomes non-uniform, resulting in uneven cooling, distortion of the steel plate, uneven material quality, etc., resulting in a serious problem.

(2) Similarly, on the exit side of the cooling system, the cooling water that remains on the top surface of the steel plate flows downstream from the cooling end position, so the steel plate is cooled more than necessary, resulting in the inability to obtain the desired material quality or uneven cooling. This causes problems such as deformation of the steel plate.

When a heated steel plate is rapidly cooled to near room temperature, such as during quenching, even if cooling water remains on the top surface of the steel plate after passing through the cooling device, there is little chance of such deformation or material defects occurring. For example, there is a problem when the temperature of the steel plate at the end of cooling is set to 200 to 300°C or higher.

To solve this problem, conventionally, a spray nozzle device configured according to the side spray method has a nozzle body that sprays pressurized water diagonally downward on the side of the steel plate conveying table. was removed by pressurized water jetted from the nozzle body of this spray nozzle device.

However, in the spray nozzle device configured according to this side spray method, the energy of the ejected pressurized water droplets is small, so the removal power for the accumulated water on the top surface of the steel plate is not sufficient. It was completely impossible to remove the large amount of cooling water that remained in the tank.

In contrast to this conventional example, the applicant of the present invention has previously invented and applied for a spray nozzle device as shown in FIGS. 4 and 5. In the spray nozzle device 16, a nozzle body 17 provided at the tip of a header 18 is positioned directly above the center in the width direction of the conveyance table 14 that conveys the steel plate 13, and a flexible pipe 22 and a control valve 23 are installed inside the header 18. A pressurized water source is connected through the header 18, and the base end of the header 18 is pivotally connected by a pin 20, and an arm piece 1 extends downward from the base end of the header 18.
The tip of the piston rod of the actuator 21 is pivotally attached to the tip of the piston rod 9, so that the nozzle body 17 is moved up and down in accordance with the operation of the actuator 21.

The water film 10 jet-molded from the nozzle body 17 is
It has a continuous fan shape and is designed to be sprayed against the upper surface of the steel plate 13 on the conveyance table 14 within an angle range of 5° to 35°.

In the spray nozzle device shown in FIGS. 4 and 5, since the water film 10 that is ejected is continuous pressurized water, it has an extremely large amount of energy. The water film 1 can be removed from the top surface of the steel plate 13, but the water film 1
0 and the moving direction of the accumulated water on the top surface of the steel plate 13 are deflected by nearly 90 degrees, so the water film 1
In addition to reducing the kinetic energy of 0, the flow direction of the water film 10 is deflected according to the moving direction of the accumulated water, so the effect of draining the accumulated water by the water film 10 is significantly reduced. Ta.

In particular, when the width of the steel plate 13 is wide and the amount of accumulated water on the steel plate 13 is large, this phenomenon appears conspicuously.
Retained water sometimes remained at both ends of the steel plate 13.

The present invention was devised to eliminate the dissatisfaction with the spray nozzle device 16 shown in FIGS. 4 and 5. In addition to the fan-shaped water film, there is a On the other hand, a strong pressurized water film is formed independently along the width direction of the steel plate, thereby compensating for the lack of energy in the fan-shaped water film on both side edges of the upper surface of the steel plate.

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

Note that in FIGS. 1 to 3, the same reference numerals as those used in FIGS. 4 and 5 indicate the same parts.

The spray nozzle device 1 according to the present invention is installed so as to be movable up and down just above the widthwise center of a conveyance table 14, and forms a continuous fan-shaped water film on the upper surface of a steel plate 13 that passes over the conveyance table 14. 1
A main nozzle body 2 that powerfully jet-forms 0 at an injection angle within an angle range of 5° to 35°, and the above-mentioned A sub-nozzle body 3 is provided for ejecting a pressurized water film 11 diagonally downward toward both ends of the steel plate 13 along the width direction of the steel plate 13.

The main nozzle body 2 is regulated so that the water film 10 jetted from the main nozzle body 2 is jetted at an angle of 35° or less (preferably 30° or less) with respect to the upper surface of the steel plate 13. This is because when the jetting angle of the water film 10 with respect to the upper surface of the steel plate 13 is 35 degrees or more, the impact force of the jetted water film 10 on the upper surface of the steel plate 13 becomes strong, and the cooling force of this water film 10 on the steel plate 13 increases. This is because it becomes more powerful than necessary.

On the contrary, the smaller the jetting angle of the water film 10 against the upper surface of the steel plate 13, the weaker the force from the water film 10 on the retained water 12 becomes.
When the amount of water is large, the ejection angle is desirably 5° or more (preferably 10° or more).

This is because when the jetting angle of the water film 10 to the top surface of the steel plate 13 becomes less than 10 degrees, the draining effect begins to deteriorate, and when it becomes less than 5 degrees, the accumulated water 12 remains on the top surface of the steel plate 13, so that the target cooling stop temperature is lower than the target cooling stop temperature of 450 degrees. The temperature becomes low, causing uneven cooling and increasing variations.

Furthermore, when the jetting angle exceeds 30°, the cooling effect by the water film 10 becomes noticeable and the temperature of the steel plate 13 drops sharply, and when the jetting angle exceeds 35°, the water film 10 causes supercooling. In addition to this phenomenon, the effect of blowing off the accumulated water 12 of the water film 10 is reduced, and the accumulated water 1 at the collision position between the water film 10 and the steel plate 13 is reduced.
It can be seen that the film thickness of the steel plate 13 increases, and the accumulated water 12 breaks the water film 10 at both ends of the steel plate 13 and flows out backward.

The sub nozzle body 3 is for forming a pressurized water film 11 that is completely independent of the water film 10 formed by the main nozzle body 2 described above, and directs the pressurized water film 11 toward both ends of the steel plate 13. , it ejects from the direction perpendicular to the direction of movement of the steel plate 13, resulting in a water film 10.
The accumulated water 12 on both sides of the upper surface of the steel plate 13 that has not been completely removed by the above steps is caused to fall from the upper surface of the steel plate 13.

This pressurized water film 11 has the inside of the sub nozzle body 3
Like the main nozzle body 2, it is connected to the header 4, so it is molded at exactly the same timing as the water film 10.

The illustrated embodiment shows an example in which the spray nozzle device 1 according to the present invention is attached to the outlet side of a cooling device 15 and used for the purpose of removing accumulated water 12 on the upper surface of a steel plate 13 after cooling.

The spray nozzle device 1 is assembled and fixed to the tip of a header 4 whose base end is connected to a water supply source (not shown) through a flexible pipe 8, and the header 4 is rotatable in the vertical direction with a pin 7 at its base end. At the tip of the arm piece 5 integrally provided in a branched manner from the proximal end fixed by this pin 7,
By connecting the tips of the piston rods of the actuator 6, the header 4 is swung vertically around the pin 7 in accordance with the operation of the actuator 6, and the spray nozzle device 1 is moved to the center of the transport table 14. It is designed to move up and down directly above.

During the passage of general materials that do not require heat treatment, this spray nozzle device 1 waits above the pass line, which is the level at which the steel plate 13 passes, due to the action of the actuator 6. When removing the water 12, the actuator 6 is moved backward according to a command from a command device (not shown) to descend to a predetermined height position that is a certain height higher than the pass line.

In the state shown in FIG. 2, the control valve 9 is adjusted to supply pressurized water at a desired pressure to the spray nozzle device 1, and a water film 10 is jetted from the main nozzle body 2 toward the upper surface of the steel plate 13.

At this time, the jetting direction of the central part of the water film 10 is
As shown in the figure, the direction of movement of the steel plate 13 is opposite.

That is, the water film 10 prevents the movement of the accumulated water 12 together with the steel plate 13, and prevents the accumulated water 12 from moving.
By stopping the steel plate 13 in place and moving the steel plate 13 in this state, the steel plate 13 is dropped from above.

Most of the accumulated water 12 on the steel plate 13 is dropped from above the steel plate 13 by this water film 10 in the manner described above, but depending on the amount of the accumulated water 12, as shown in FIG. The accumulated water 12 located at both ends of the upper surface of the steel plate 13 may not completely fall from above the steel plate 13 and remain, but all of this remaining accumulated water 12 is absorbed by the pressurized water film 11 from the sub-nozzle body 3 onto the steel plate. 13 It was dropped from above and the steel plate 1
All of the accumulated water 12 on 3 can be dropped.

As described above, the spray nozzle device 1 according to the present invention can remove the accumulated water 12 remaining at both ends of the upper surface of the steel plate 13 without being completely removed by the main nozzle body 2.
, the water film 10 formed by the main nozzle body 2
In addition, since the water is removed from above the steel plate 13 by the pressurized water film 11 formed independently by the sub-nozzle body 3, the accumulated water 12 on the steel plate 13 can be more completely removed. I can do it.

In addition, since the amount of accumulated water 12 that has not been completely removed by the water film 10 of the main nozzle body 2 is not large at all and is only a small amount, the pressurized water film 11 of the sub nozzle body 3 is used to remove this remaining accumulated water 12. A sufficiently large force can be applied, thereby making it possible to completely remove the remaining water 12.

Furthermore, since the inside of the sub-nozzle body 3 communicates with the inside of the main nozzle body 2, the formation of the pressurized water film 11,
The extinction control can be achieved completely integrally with the formation of the water film 10 by the main nozzle body 2 and the frontal control.
This simplifies its operation control.

As is clear from the above description, the spray nozzle device according to the present invention can completely and reliably drop and remove all of the accumulated water on the steel plate, and its operation control is simple and easy. Since it is simple, it is easy to implement and exhibits many excellent effects.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the operating state of an embodiment of the present invention. FIG. 2 is a front view of the embodiment shown in FIG. 1 during operation. FIG. 3 is an operational state diagram showing an operation mode for removing accumulated water on a steel plate by the device of the present invention. FIG. 4 is a plan view showing the basic structure of the spray nozzle device. FIG. 5 is a front view of the spray nozzle device shown in FIG. 4. Explanation of symbols, 1...Spray nozzle device, 2...
... Main nozzle body, 3 ... Sub-nozzle body, 4 ... Header, 10 ... Water film, 11 ... Pressurized water film, 12 ...
Stagnant water, 13... steel plate, 14... conveyance table.

Claims (1)

[Scope of utility model registration request] It is installed so as to be able to move up and down directly above the center in the width direction of the transfer table, and a continuous fan-shaped water film is applied to the upper surface of the steel plate that passes over the transfer table within an angle range of 5° to 35°. A main nozzle body that performs strong injection molding at the injection angle, and a main nozzle body on both sides of the main nozzle body,
A spray nozzle device comprising: a sub-nozzle body that is installed in communication with the main nozzle body and spouts a pressurized water film diagonally downward along the width direction of the steel plate toward both ends of the steel plate.