JPH0153146B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a continuous belt-type continuous casting apparatus for steel thin plates, and more particularly to a continuous casting apparatus that prevents the occurrence of flash between an endless belt and a side block.

2. Description of the Related Art A conventional belt-type continuous thin plate casting apparatus is usually constructed as shown in FIGS. 1 and 2. In those figures, 2 and 2 are endless belts made of steel with a thickness of about 1 to 2 mm, and these endless belts 2 and 2 are stretched around three pulleys 3, 3, and 3, respectively, as shown in Figure 1. The opposing surfaces are separated by an appropriate distance. Further, these endless belts 2, 2 are configured to run synchronously in the direction of the arrow by a pulley driven by a drive (not shown).
4 is a tundish, and 5 is its nozzle. Molten steel in the tundish 4 is continuously supplied through the nozzle 5 between the opposing endless belts 2, 2. 6, 6 are those endless belts 2,
2, a back-up roll supporting static pressure (molten steel pressure) corresponding to the height of the supplied molten steel, 7, 7
is a spray nozzle that cools the molten steel between the belts 2, 2, and the spray 8 is sprayed from these nozzles 7, 7 onto the back surfaces of the belts 2, 2 to cool the endless belts 2, 2.
, indirectly cools the molten steel between the endless belts 2, 2, solidifies the molten steel, and forms a thin plate (slab) 1.
is beginning to form. Reference numerals 9 and 9 denote side blocks fixedly attached to a frame (not shown), and these side blocks 9 and 9 are arranged so as to be able to freely come into sliding contact with each other as shown in FIG. 2 between both ends of the endless belts 2 and 2. It has the role of preventing molten steel from flowing out in the lateral direction between the opposing endless belts 2, 2. 10,1
0 is a cooling water passage provided in these side blocks 9, 9, and the cooling water from these cooling water passages 10, 10 not only cools the side blocks 9, 9, but also indirectly cools both sides of the slab 1. It has the role of cooling and solidifying. Reference numerals 11 and 11 denote presser blocks that press the opposing endless belts 2 and 2 against the side blocks 9 and 9, and these presser blocks 11 and 11
are elastically supported by the frame, and their elasticity allows the inner surfaces of both end portions of the endless belts 2, 2 to be slidably pressed against the both side blocks 9, 9. And the pair of endless belts 2, 2, side blocks 9, 9 and presser blocks 11, 11
A mold for continuous casting is formed. The details of part A in FIG. 2 are shown in FIG. 3, and the side block 9 is fixed, the presser block 11 is supported so as not to be displaceable in the left and right direction, and the endless belt 2 is running. However, since the endless belt 2 is deformed by heat deformation or molten steel pressure, there is inevitably a small gap, for example 0.2 to 0.3, between the side block 9 and the endless belt 2 and between the presser block 11 and the endless belt 2. A gap of about mm is required. On the other hand, from the standpoint of cooling the slab 1, the relative positions of the side block 9 and the holding block 11 are as shown in FIG. Block 11 is on the outside.

Note that R in FIG. 1 indicates a drawing roll.

Problems to be Solved by the Invention As mentioned above, a certain amount of clearance is required between the side block 9 and the endless belt 2 to allow smooth sliding of the belt 2, and the end of the slab 1 In order to efficiently cool the
are arranged somewhat outside of the side block 9. Therefore, the endless belt 2 swells toward the back side (toward the spray nozzle 7) due to the pressure of the molten steel, as shown in FIG. 3, and a gap is created at the C portion.

Therefore, in the conventional equipment, the gap C near the meniscus (surface) of the molten steel (section 1' in Fig. 1)
Molten steel is inserted into the hole, which solidifies and becomes a burr.
This burr increases the pull-out resistance of the slab 1, causing the slab 1 to crack when it is pulled out, or
This causes problems such as making it impossible to pull out the material.

The present invention eliminates the drawbacks of the conventional apparatus described above, and provides a belt-type continuous casting apparatus that prevents the occurrence of cast burrs and that does not cause the risk of cracking of the slab during drawing of the slab or of making it impossible to pull out the slab. The purpose is to

Means for Solving the Problem A presser block that presses both ends of the endless belt against the side block is provided with a pressurized water supply port and a pressurized water throttle section that spouts pressurized water toward the endless belt inside the inner edge of the side block. and.

Function Pressurized water supplied from the pressurized water supply port into the presser block presses the inner surfaces of both ends of the endless belt in a slidable manner against the side blocks, and also presses the endless belt near each side block through the pressurized water restrictor. The belt is bent inward against the internal molten steel pressure.

EXAMPLE The present invention will be specifically explained with reference to an example shown in FIGS. 4 and 5. 2, 2 in Figure 4
are a pair of endless belts stretched around pulleys, similar to the belts of the above-mentioned conventional device, and these belts and pulleys form a pair of endless belt devices. Molten steel 1
is being supplied continuously. 7 is a spray nozzle, 8 is a cooling spray water sprayed from the spray nozzle 7 onto the back surface of the belts 2, 2, and 9 is a side block having a cooling water passage 10. The relational structure of is almost the same as that of the conventional device described above.
(Equivalent parts are given the same reference numerals.) Reference numerals 12 and 12 refer to presser blocks that slidably press both ends of the belts 2 and 2 to the side blocks 9 and 9 via pressurized water. Block 1
2 and 12 have a pressurized water supply port 13 and a pressurized water constriction section 14, and the pressurized water 15 sent into the presser block 12 from the pressurized water supply port 13 is
The two ends of the endless belt 2 are slidably pressed against the side block 9 from the back side thereof, and the two ends of the endless belt 2 are pressed toward the molten steel inside in the pressurized water throttle section 14, and the molten steel is The pressurized water constriction section 1 is configured to bend and deform toward the molten steel side against pressure.
4 and the side block 9 are determined. In this case, the pressure of the pressurized water 15 is set to be higher than the molten steel pressure in the constricted portion 14.
The amount of cooling water 15 and the size of constriction section 14 are set appropriately.

One embodiment of the present invention is configured as described above, and when the device starts operating, a pair of opposing endless belts 2, 2 run tensioned on pulleys driven and rotated by a drive source. In the meantime, the molten steel 1 supplied from the tundish is indirectly cooled via the endless belt 2 by the spray water 8 from the cooling spray nozzle 7, and forms a solidified shell to become a slab, and as the belt 2 runs. and is continuously drawn out by drawing rolls. In this case, endless belt 2
The pressure water 15 supplied to the presser block 12 through the pressurized water supply pipe 13 causes the side block 9 to
At the same time, the pressure water 15 passing through the pressurized water throttle section 14 pushes the molten steel at a higher pressure than the molten steel pressure, deforming it inward as shown in section D, and forming a gap between the side block 9 and the inner surface of the belt 2. There is no gap at C′. Therefore, there is no possibility that molten steel will be inserted between the side block 9 and the endless belt 2 near the meniscus of the molten steel, causing burrs. Note that since water pressure does not act on the E section of the endless belt 2, it is pushed toward the back side by the internal molten steel pressure.
This is supported by a back-up roll (not shown) (back-up roll 6 in FIG. 1). Also, the cooling water 15 is flowing at high speed to C', D on the back side of the endless belt 2.
As the heat flows through the corners, both corner parts of the slab are sufficiently cooled.

Since the present invention has the above-described structure and operation, the present invention eliminates the drawbacks of the conventional device described above, and prevents the slab from cracking or becoming impossible to pull out when the slab is pulled out. This has the practical effect of realizing a belt-type continuous casting apparatus that is free from the risk of

The present invention can also be applied to belt and drum type continuous casting equipment. Figures 6 and 7 are
An example in which the present invention is applied to a belt and drum type continuous casting device is shown. In these figures, 2' is a drive source (not shown) that drives and rotates pulleys 3', 3',
3' is an endless belt stretched, 7' is a spray nozzle for cooling the belt 2', 8' is spray water, and the spray water 8' from the spray nozzle 7' is sprayed toward the back of the belt 2'. The belt 2' is cooled by cooling the belt 2'. A rotating drum 16 has flanges 16a at both ends, is cooled by cooling water flowing inside, and is rotated in the direction of the arrow by a drive source (not shown).
Both ends of the belt 2' are sandwiched between the outer end surfaces of the flanges 16a at both ends of the belt 2' and a presser block 12' having a cooling water supply port 13' and a constriction part 14'. The flange 16a of the drum 16 is heated by the pressure of the cooling water from the cooling water supply port 13'.
It is adapted to be slidably pressed into contact with the outer end surface of. The molten steel 1 in the tundish 4' flows from the nozzle to the flanges 16a on both sides of the drum 16.
supplied to the space formed between the surfaces of the belt 2';
It is cooled by cooling water flowing through the drum 16 and spray water 8' from the spray nozzle 7' to form a solidified shell, which becomes the slab 1 and is pulled out by a drawing roll R'. In this case, both ends of the belt 2' are pressed against the flange 16a of the drum 16 by pressure water supplied into the presser block 12'.
Since the belt 2' is pressed against the outer end surface of the flange 16a, no gap is created between the outer end surface of the flange 16a and the belt 2'.
Therefore, since there is no possibility of burrs forming in this part, this example also produces the same functions and effects as the above-mentioned example.

Effects of the Invention The belt-type thin plate continuous casting apparatus according to the present invention includes a pair of endless belts stretched at appropriate intervals between a plurality of pulleys that are driven and rotated in a predetermined direction by a drive source, and a pair of endless belts stretched at appropriate intervals. In a belt-type thin plate continuous casting machine equipped with a continuous casting mold consisting of fixed side blocks that slidably support the inner surfaces of both ends, and presser blocks that press the inner surfaces of both ends of both ends of the endless belt to these side blocks. , the presser block is provided with a pressurized water supply port and a pressurized water throttle part that spouts pressurized water toward the endless belt inside the inner edge of the side block, and the pressurized water supplied from the pressurized water supply port into the presser block is Then, the inner surfaces of both ends of the endless belts are slidably pressed against the side blocks, and the endless belts in the vicinity of each side block are moved inward through the pressurized water restrictor against the internal molten steel pressure. By configuring it to cause the curved deformation, the following effects are produced.

(1) Only the ends of the belt are deformed, and most of the center is flat, making it possible to obtain slabs with little variation in plate thickness.

(2) The supporting force of the belt can be controlled independently at the ends and the center, reducing variations in plate thickness.

(3) By adjusting the pressure of pressurized water supplied to the presser block, a reliable seal of molten steel can be achieved.

[Brief explanation of drawings]

1 to 3 are schematic explanatory diagrams of a conventional device, in which FIG. 1 is a side view, FIG. 2 is a sectional view taken along the - line in FIG. 1, and FIG. 3 is an enlarged view of section A in FIG. 2. 4 and 5 are schematic explanatory diagrams of one embodiment of the present invention,
Fig. 4 is a sectional view corresponding to Fig. 2, and Fig. 5 is a cross-sectional view corresponding to Fig. 4.
An enlarged view of part B in the figure, and FIGS. 6 and 7 are schematic explanatory views of an example in which the present invention is applied to a belt and drum type thin plate continuous casting machine. FIG. 6 is a side view, and FIG. FIG. 2, 2'...Endless belt, 3'...Pulley, 4'
...Tandate dish, 7,7'...Spray nozzle, 8,8'...Spray water, 9...Side block, 12...Press block, 13...Pressure water supply port, 14...Squeezing part, 15... ...Pressure water, 16...
...Drum, 16a...Flange.

Claims (1)

[Claims] 1 A pair of endless belts stretched at appropriate intervals between a plurality of pulleys that are driven and rotated in a predetermined direction by a drive source, and a fixed structure that slidably supports the inner surfaces of both ends of the endless belts. In a belt-type thin plate continuous casting machine equipped with a continuous casting mold consisting of side blocks and presser blocks that press the inner surfaces of both ends of both endless belts to the side blocks, the presser block is provided with a pressurized water supply port and the side blocks. A pressurized water throttle part is provided inside the inner edge of the endless belt to spray pressurized water toward the endless belt, and the pressurized water supplied from the pressurized water supply port into the presser block is used to control the inner surfaces of both ends of the endless belt.
In addition to being slidably pressed against the side block,
Through the pressurized water restrictor, the endless belt near each side block is compressed against the internal molten steel pressure.
A belt-type continuous thin plate casting machine characterized by being configured to curve inward.