JPS58188548A - Continuous casting device of steel plate - Google Patents

Abstract

PURPOSE:To reduce the friction between gates and cooling rolls and to extend the life of an installation by forming the gates with the endless belts which move in roughly the same downward direction as the rolls in the contact parts with both ends in the axial direction of the rolls. CONSTITUTION:A titled device consists of a pair of cooling rolls 1 which are mutually the same in diameter and length and are in proximity with each other by having horizontal axial lines, a diriving means for rotating the rolls 1 and a pair of gates for forming a molten steel well 11 cooperatively with the upper half parts on the outside circumferential surfaces of the rolls 1. Each of the above-described gates consists of an endless belt 6 which consists of plural blocks 7 connected endlessly and is disposed so as to contact with both ends in the axial direction of the rolls, two wheels 9 to be put on with the belt 6, a pressing means 10 for pressing the blocks 7 to the rolls 1 and a driving means for moving the belt 6.

Description

[Detailed Description of the Invention] The present invention relates to a continuous steel plate casting device that can directly cast steel plates from molten steel without causing molten steel leakage, and can provide equipment with a long service life. .

A continuous casting apparatus for steel sheets, for example, includes a pair of cooling rolls that have the same length and diameter, whose axes are horizontal and parallel to each other, and are close to each other, and a pair of cooling rolls that are cast in opposite directions. A driving means for rotating at the same circumferential speed and an upper half of the outer peripheral surface of the pair of cooling rolls provided at both ends of the outer peripheral surface of each of the pair of cooling rolls in the axial direction operate to rotate the molten steel. It has a pair of fixed weirs made of refractory material to form a reservoir, and the molten steel supplied to the molten steel reservoir is brought into contact with the outer circumferential surface of the pair of rotating cooling rolls, solidified, and thus cooled. There is an apparatus in which a pair of solidified shells obtained on the outer circumferential surface of a roll are pressed against each other as they pass through a roll gap between a pair of cooling rolls, and taken out from the roll gap downward as a densified plate.

However, in such a device, in order to prevent the molten steel supplied from above into the molten steel pool from leaking from between the fixed weir and the cooling roll, the fixed weir is placed in the axial direction of the outer peripheral surface of the cooling roll. The ends are usually touching. In such a state, the fixed weir is stationary, whereas the cooling roll is rotating, so both the fixed weir and the cooling roll are susceptible to wear, and therefore their service life cannot be extended. Also, the molten steel in the molten steel reservoir sticks to the fixed weir,
There is a risk of hindering the removal of the cast plate.

Therefore, this invention was made to solve the above-mentioned problems.A pair of cooling rolls having the same length and diameter, whose axes are horizontal and parallel to each other, and which are close to each other, a driving means for rotating the pair of cooling rolls in opposite directions at the same circumferential speed; and an outer peripheral surface of the pair of cooling rolls provided at both axial ends of the outer peripheral surface of each of the pair of cooling rolls. In a continuous steel plate casting apparatus having a pair of weirs for forming a molten steel pool in cooperation with the upper half of the steel plate, each of the pair of weirs is connected to a plurality of blocks having flat outer surfaces in an endless connection. , a pair of endless belts arranged such that a portion of the plurality of blocks is in contact with each of both axial ends of the outer circumferential surface of the pair of cooling rolls; at least two wheels around which the endless belts are wound; a pair of suppressing means provided inside each of the pair of endless belts for pressing a part of the plurality of blocks against each of both ends in the axial direction of the outer circumferential surface of the pair of cooling rolls; A drive means connected to at least one wheel for moving the endless belt in a direction in which the block descends at the contact portion with each of the axial ends of the outer circumferential surface of the cooling roll. have

The present invention will be described below with reference to embodiments and drawings.

FIG. 1 is a schematic front view showing one aspect of the continuous casting apparatus for steel sheets according to the present invention, FIG. 2 is a schematic plan view of the same apparatus, and FIG.
The figure is a cross-sectional view of the cooling roll.

In the figure, reference numeral 1 denotes a pair of cooling rolls that are close to each other, and the pair of cooling rolls 1 have the same length and the same diameter, and their axes are horizontal and parallel to each other. The pair of cooling rolls 1 are rotated by a driving means (not shown) in mutually opposite directions, that is, in a direction in which their respective outer peripheral surfaces descend in the portion where their respective outer peripheral surfaces are closest to each other, at the same circumferential speed.

As shown in FIG. 3, the peripheral wall 1a of each of the pair of cooling rolls 1 is made of a metal with high thermal conductivity (for example, copper or copper alloy), and a spiral shape is formed in the circumferential direction. Alternatively, a continuous ring-shaped cooling medium passage 2 is formed. A cooling medium such as water or a high boiling point heat medium is supplied to the shaft (hollow shaft, but the middle is closed) 3 of the cooling roll 1.
is supplied from one end through the supply pipe 4 to one end of the cooling medium passage 2 located at one end of the peripheral wall 1a, and
The coolant passes therethrough to reach the other end of the cooling medium passage 2 located at the other end of the peripheral wall 1a, and from there passes through the discharge pipe 5 and is discharged to the other end of the shaft 3. Therefore, the molten steel that has come into contact with the outer peripheral surface of the cooling roll 1 is transferred to the cooling medium passage 2 of the peripheral wall 1a.
It solidifies by exchanging heat (cooling) with the cooling medium supplied inside.

As shown in FIGS. 1 and 2, reference numeral 6 denotes a pair of endless belts in which a plurality of blocks 7 made of, for example, ceramic and having heat and abrasion resistance with flat outer surfaces are connected endlessly. Each of the belts 6 is arranged so that a portion thereof is in contact with each of both ends of the pair of cooling rolls 1. Each of the pair of endless belts 6 includes a plurality of blocks 7, a plurality of support plates (not shown) attached to the inside of each of the plurality of blocks 7, and two belts each of which is connected to each of the plurality of support plates. It consists of an endless chain 8. IlJ
The adjacent blocks 7 are arranged so that their outer surfaces are continuous without gaps during linear movement.

The two endless chains 8 of each of the pair of endless belts 6 are
It is routed around each of the two wheels 9 arranged in the vertical direction.

Reference numeral 10 denotes a pair of suppressing mechanisms provided inside each of the pair of endless belts 6 for pressing a part of the plurality of blocks 7 against each of both ends in the axial direction of the outer circumferential surface of the pair of cooling rolls 1. . The suppression mechanism 10 includes a base 10a supported by support means (not shown), a spring 10b having one end fixed to the base 10a, and a pressing plate 10c having a flat pressing surface fixed to the other end of the spring 10b. Equipped with spring 1. The pressing plate 10c is pressed against the support plate (not shown) inside the endless belt 6 by the elasticity of the ob, and a part of the plurality of blocks 7 is pushed onto the pair of cooling rolls 1.
Press against the axial end of the outer circumferential surface of the In this way, a portion of each of the plurality of blocks 7 of the pair of endless belts 6,
A molten steel reservoir 11 is formed by the upper half of the outer peripheral surface of each of the pair of cooling rolls 1 . In the molten steel sump 11,
Molten steel in a tundish (not shown) placed above the tundish is supplied through a nozzle at the bottom of the tundish.

At least one of the two wheels 9 is provided with a drive means (not shown) for moving the endless belt 6 in a direction in which the block 7 is moved downward at the contact portion with each of the axial ends of the outer circumferential surface of the pair of cooling rolls 1. ) are connected.

With the above configuration, the molten steel A supplied into the molten steel sump 11 comes into contact with the rotating cooling rolls 1 and is cooled and solidified, forming a solidification nozzle, and in this way, each of the pair of cooling rolls 1 is The pair of solidified shells obtained on the outer circumferential surface are pressed (rolled down) against each other by the pair of cooling rolls 1 as they pass through the roll gap as the cooling roll 1 rotates, and are rolled into one sheet. As the cast plate A',
It is taken out downward from the roll gap.

On the other hand, the descending speed of the block 7 of the endless belt 6 is the same as the speed at the outermost circumference of the cooling port 1 or the average speed in the radial direction of the cooling roll 1 at the contact area between the block 7 and the cooling roll 1. Keep it.

By doing so, the relative sliding amount at the contact portion between the block 7 and the cooling roll 1 is reduced, and as a result, mutual friction between the two is extremely reduced.

As explained above, in this invention, since the weir is constituted by an endless belt that moves in the downward direction at the contact part with the cooling roll, there is little mutual friction between the weir and the cooling roll, and it is extremely durable. It is possible to provide equipment with a long life and also to manufacture cast plates without leaking molten steel.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view showing one aspect of the continuous casting apparatus for steel sheets according to the present invention, FIG. 2 is a schematic plan view of the same apparatus, and FIG.
The figure is a cross-sectional view of the cooling roll. DESCRIPTION OF SYMBOLS 1... Cooling roll, 6... Endless belt, 7... Block, 9... Wheel, 10... Suppression mechanism. Applicant Nippon Kokan Co., Ltd. Substitute Keitabe Tsutsumi (1 other person) 1R Figure 2 Figure 3 2 21α

Claims (1)

[Scope of Claims] A pair of cooling rolls having the same length and the same diameter, whose axes are horizontal and parallel to each other, and which are close to each other; A driving means for rotating at a high speed and an upper half of the outer peripheral surface of the pair of cooling rolls provided at both axial ends of the outer peripheral surface of each of the pair of cooling rolls cooperate to form a molten steel pool. In a continuous steel plate casting apparatus having a pair of weirs for cooling each of the pair of weirs, a plurality of blocks each having a flat outer surface are connected endlessly, and a part of the plurality of blocks is used for cooling the pair of weirs. a pair of endless belts disposed so as to be in contact with each of both axial ends of the outer circumferential surface of the roll; at least two wheels around which the endless belts are wound; and a pair of endless belts provided inside each of the pair of endless belts. a pair of suppressing means for pressing a portion of the plurality of blocks onto each of the axial ends of the outer peripheral surface of the pair of cooling rolls; and contact with each of the axial ends of the outer peripheral surface of the pair of cooling rolls. and a driving means connected to at least one of the wheels for moving the endless belt in the direction in which the blocks descend in the continuous casting apparatus for steel sheets.