JPH0126790B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a slab cooling device in continuous casting equipment.

In recent years, in order to improve the quality of slabs or perform direct rolling, the soft cleaning method, in which a mixture of steam and water is evenly sprayed over the entire area of slabs in the secondary cooling zone, is used to perform soft cooling. It is considered that a method can be adopted. However, in conventional continuous casting equipment, cooling water is simply supplied to a large number of air mist nozzles for secondary cooling of slabs, so the amount of water from the lower air mist nozzles is lower than that from the upper air mist nozzles. The spray is stronger due to the water head pressure, and it is not possible to evenly soft clean the slab over the entire secondary cooling area.

Therefore, the present invention provides a slab cooling device for continuous casting equipment that solves these problems, and is characterized by having a cooling water injection nozzle at the tip and a compressed air supply port at a suitable location in the center. A cylinder for mixing air and water is provided, a cooling water supply pipe is movably inserted into the cylinder along the axial direction of the cylinder, and a drive device is provided to move the pipe. According to such a configuration, simply moving the pipe by the drive device changes the length of the compressed air supply passage from the tip of the pipe to the compressed air supply port, and changes the flow resistance of the compressed air through that passage. This allows the air-water ratio to be freely changed for each nozzle. Therefore, the amount of spray from all nozzles can be made almost equal, and the slab can be evenly soft-cleaned over the entire secondary cooling area, providing high-quality slabs. It is something that can be done. Moreover, direct rolling can be performed in good condition.

Hereinafter, one embodiment of the present invention will be described based on the drawings. 1 is a large number of rollers that form a conveyance path for the slab 2 pulled out from the mold in the direction of arrow A; 3 is an air-water mixer having a cooling water injection nozzle 4 at its tip and a compressed air supply port 5 at a suitable location in the center; It is a cylindrical body inserted between each roller 1 and facing the slab 2. Reference numeral 6 denotes a ring-shaped seal member fixed to the base end of the cylindrical body 3, and is fixed to the fixed beam 7. 8 is a cooling water supply pipe whose tip is movably inserted into the cylinder 3 through the through hole of the sealing member 6, 9 is an O-ring, and 10 is a moving block bolted to the upper part of the pipe 8. , screw hole 11
has. Reference numeral 12 denotes a cross beam which is disposed above the slab conveyance route in a direction that crosses this route and whose both ends are fixed to supports 13 erected on both sides of the route. The operating body is rotatably inserted into the through hole of the girder 12 via the sleeve 15, and has a square head 14A at the top. Reference numeral 16 is a threaded rod whose upper end is fixed to the small diameter portion of the lower end of each operating body 14, and is screwed into each of the threaded holes 11. 17 is a screw shaft whose both ends are rotatably supported by both supports 13; 18 is a first servo motor that rotates the screw shaft 17 forward and reverse; 19 is a first pulse transmitter that detects the rotation angle of the screw shaft 17; 20 is a support rod whose both ends are fixed to both supports 13 above the screw shaft 17; 21 is a support rod with a screw hole provided in the center screwed into the screw shaft 17 and a through hole provided in the upper part of the support rod 20; The chuck body 22, which is movably fitted onto the outside, is a chuck that hangs down from the chuck body 21 so as to be able to rise and fall, and is fitted into the square head 14A of each operating body 14. The chuck main body 21 has a second servo motor 23 that rotates the chuck 22 in forward and reverse directions, a second pulse transmitter 24 that detects the rotation angle of the chuck 22, and an air cylinder (not shown) that raises and lowers the chuck 22. . 25 is a cooling water supply main pipe whose base end is connected to a water pressure pump; 26 is an on-off valve interposed at a suitable position at the base end of the main pipe 25; 27 is a cooling water supply port 28 of the main pipe 25 and the pipe 8; A flexible pipe 29 connecting the upper end opening is a compressed air supply main pipe whose base end is connected to an air pump, and the compressed air supply ports 5 are communicated with each other. 30 is an air valve interposed at a proper position at the base end of the main compressed air supply pipe 29; 31 is a scale erected on the fixed beam 7; the water pipe between the lower end of the pipe 8 and the compressed air supply port 5; This is for displaying the length S. 32 is a pointer extending from the moving block 10 toward the scale 31, and 33 is a star-shaped spacer.

The operation of the above configuration will be explained. First, when the on-off valve 26 is opened, cooling water enters the lower mixing chamber 34 in the air-water mixing cylinder 3 from the main cooling water supply pipe 25 via the flexible pipe 27 and the cooling water supply pipe 8. Next, when the air valve 30 is opened, compressed air flows from the compressed air supply main pipe 29 through the supply port 5 to the compressed air supply passage 35 between the cylinder body 3 and the pipe 8.
is press-fitted into the mixing chamber 34 through the mixing chamber 3.
At step 4, air and water are mixed. Next, from nozzle 4 to slab 2
Air mist is sprayed towards the

Next, when you want to adjust the amount of spray from each nozzle 4, you can do as follows. That is, by appropriately rotating the first servo motor 18 in the forward and reverse directions, the screw shaft 17 is rotated to move the chuck body 21 in the direction of arrow B or C, and bring it above the operating body 14 corresponding to the nozzle 4 to be adjusted. . Next, the chuck 22 is lowered by an air cylinder, and the square head 14 is lowered.
Fit into A. Next, the second servo motor 23 is rotated forward and backward as appropriate. As a result, the threaded rod 16 is rotated forward or reverse, and the moving block 10 and pipe 8 are moved in the direction of arrow D or E.
The water pipe length S is changed as appropriate. If the water pipe length S is increased, the flow resistance in the compressed air supply passage 35 increases, the amount of compressed air supplied to the mixing chamber 34 decreases, the air-water ratio increases, and the spray from the nozzle 4 increases. The situation becomes dense. On the contrary, if the water pipe length S is shortened, the compressed air supply passage 35
The flow resistance within the mixing chamber 34 decreases, the amount of compressed air supplied into the mixing chamber 34 increases, the air-water ratio decreases, and the spray from the nozzle 4 becomes coarse. The relationship between the water pipe length S and the air/water ratio is shown in Fig. 4.

As described above, according to the present invention, simply by moving the pipe using the drive device, the length of the compressed air supply passage from the tip of the pipe to the compressed air supply port changes, and the flow resistance of compressed air passing through the passage changes. This makes it possible to freely change the air-water ratio for each nozzle. Therefore, the amount of spray from all nozzles can be made almost equal, and the slab can be evenly soft-cleaned over the entire secondary cooling area, and the slab can be provided with high quality. It is something that can be done. Moreover, direct rolling can be performed in good condition.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a schematic side view, Fig. 2 is a vertical cross-sectional view of the lower part of the main part, Fig. 3 is a front view of the upper part of the main part, and Fig. 4 shows the length and air of the water pipe. It is a graph showing the relationship with water ratio. 2... Slab, 3... Air-water mixing cylinder, 4... Cooling water injection nozzle, 5... Compressed air supply port, 8... Cooling water supply pipe, 10... Moving block, 16... Threaded rod, 2
2...Chuck (drive device), 25...Cooling water supply main pipe, 29...Compressed air supply main pipe, 34...Mixing chamber, 3
5...Compressed air supply passage, S...water pipe length.

Claims (1)

[Claims] 1. A cylinder for mixing air and water is provided with a cooling water injection nozzle at the tip and a compressed air supply port is formed at a suitable place in the center, and the cooling water supply pipe is movable inside the cylinder along the axial direction of the cylinder. 1. A slab cooling device for continuous casting equipment, comprising a driving device that is inserted into a pipe and moves the pipe.