JP2890604B2 - Continuous casting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] In the present invention, a strip-shaped thin plate is continuously cast through a gap between a pair of moving molds forming a molten metal dam by a smooth curved surface on a pouring side. The present invention relates to a continuous casting device.

[Prior Art] As a pair of moving molds for forming a molten metal dam with a smooth curved surface on the pouring side, two mold rolls are arranged in parallel, and either one of a twin roll type and a twin roll is a belt type. There is a belt-roll type (belt-drum type) or a twin-belt type in which both are made into a belt type. As a conventional twin-roll type continuous casting device for continuously casting a strip-shaped thin plate, FIG. 8 shows an example. That is, a pair of pressure-moldable mold rolls 1 and 2 whose inner surfaces can be cooled with water or the like are disposed horizontally and parallel as a moving mold and the thickness of the strip-shaped thin plate 3 to be cast. The pair of mold rolls 1 and 2 are held in a gap G corresponding to the mold rolls, and are driven to rotate in opposite directions indicated by arrows.
Further, a molten metal tub 6 having an arc-shaped bottom along the peripheral surface of the mold rolls 1 and 2 and an opening of a pouring nozzle 5 at the bottom is provided above the mold rolls 1 and 2. In the molten metal dam 4, a gap S is formed between the molten metal dam 1 and the peripheral surfaces of the mold rolls 1 and 2, and the molten metal 7 supplied into the molten metal tub 6 is discharged from a bottom pouring nozzle 5. There is one in which the molten metal is poured into the molten metal dam 4 and solidified on the surfaces of the rotating mold rolls 1 and 2 to form a strip-shaped thin plate 3 from the gap G between the mold rolls 1 and 2 ( JP-A-63-235045).

As another conventional continuous casting apparatus, as shown in FIG. 9, an endless belt 11 wound around rolls 8, 9, and 10 is used.
Is opposed to the mold roll 2 as one moving mold,
In addition, a dam frame 12 composed of a side seal plate and a barrel seal plate is disposed above the endless belt 11 and the mold roll 2 so that the molten metal dam 4 is formed in the weir frame 12. There is one in which a molten metal tub 6 is arranged so that the bottom is immersed in a molten metal 7 (Japanese Patent Laid-Open No. 62-16856). As another type, a molten metal dam is formed by providing a weir frame. There is one in which a core is provided in a molten metal dam and the core is raised and lowered by a lifting device (Japanese Utility Model Application Laid-Open No. 61-4852).

[Problems to be Solved by the Invention] However, in the case of the above-described conventional continuous casting apparatus, any of the methods has the following functions: (I) the function of adjusting the outflow amount of the molten metal 7 is the function of a core containing the molten metal 7 Since the gap S is adjusted by raising and lowering the molten metal tub 6 as a whole, a large lifting apparatus is required. (II) The gap S is changed to adjust the outflow amount of the molten metal 7. For example, when the supply amount of the molten metal 7 to the molten metal dam 4 is adjusted according to a change in the moving speed of the movable mold, the static pressure of the molten metal in the molten metal tub 6 must be considered.
(III) Since the molten metal tub 6 and the molten metal dam 4 are always in communication with each other, even if the plate is cut or the like, it is located in the molten metal tub 6 or the molten metal dam 4 or the like. Since the casting operation cannot be stopped unless the molten metal 7 is completely discharged, it is not possible to proceed to the next step and re-casting can be performed only after all the molten metal in the molten metal dam has flowed out. .

Therefore, the present invention allows the flow rate of the molten metal to be adjusted without raising and lowering the molten metal tank as a whole, and also adjusts the amount of molten metal supplied to the molten metal dam regardless of a change in the static pressure of the molten metal in the molten metal tank. So that the melt outlet can be quickly closed in the event that the plate breaks,
In addition, the casting operation can be arbitrarily stopped in the middle without discharging the molten metal in the molten metal tub so that the next process can be easily dealt with, and the molten metal outlet is rapidly closed. It is intended to easily reset the opening of the molten metal outlet later.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a continuous dam in which a bottom portion of a molten metal tub is disposed in a molten metal dam formed at an upper portion between a pair of moving molds. In the casting apparatus, a valve for opening a molten metal outlet provided with a valve seat at a bottom portion of the molten metal tub, and opening and closing the molten metal outlet by being in contact with or separated from the valve seat to adjust an outflow amount of the molten metal; An opening / closing device for opening / closing the valve, and an opening setting device for setting the opening of the valve so that the opening / closing speed for opening / closing the valve and the position of the valve can be individually set.

[Operation] When the valve is opened and closed by operating the opening and closing device, the opening and closing speed of the valve can be arbitrarily adjusted, so that the valve can be quickly closed in the event of a plate breakage. Since the molten metal outlet can be opened or closed, the amount of molten metal flowing out from the molten metal tub to the molten metal dam can be easily adjusted by the valve opening setting device, and the molten metal in the molten metal tub can be discharged. Can set the valve opening.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 and 2 show one embodiment of the present invention.
As a twin-roll type similar to the continuous casting device shown in FIG.
The molten metal dam 6 formed on the upper part between the mold rolls 1 and 2 is formed by the molten metal tub 6 so that the gap S between the molten metal tub 6 and the peripheral surfaces of the mold rolls 1 and 2 can be maintained substantially constant. 7 is discharged, and the molten metal 7 is sent out while being solidified by being guided to the gap G between the mold rolls 1 and 2,
In the configuration in which the thin plate 3 having the thickness regulated by the gap G can be continuously cast in a strip shape, the molten metal 7 in the molten metal tub 6 is provided at the bottom of the molten metal tub 6.
A molten metal outlet 13 is provided over the entire length of the molten metal tub 6, and a valve 14 for opening and closing the molten metal outlet 13 to adjust the amount of the molten metal 7, and a cylinder 18 for opening and closing the valve 14. A device 15 is provided on the molten metal tub 6, and the opening and closing device 15 is further provided.
In addition, an opening setting device 16 that operates independently of the opening and closing operation of the valve 14 to set the opening of the valve 14 is incorporated.

More specifically, the melt tub 6 has a melt outlet 13 having a required width opened at the bottom center so as to extend in the direction of the roll axis at a position directly above the gap G.
The valve seat 21 is uniformly formed on the upper surface of the inner edge of the opening, and the opening at the upper end of the molten metal tub 6 is closed by a lid 17 having a molten metal inlet (not shown) for receiving the molten metal 7 from the ladle. There is a configuration.

Further, the valve 14 is formed by projecting an upper portion of a valve body 19 corresponding to the length of the molten metal outlet 13 outward to form a contact portion 19a with the valve seat 21 and to solidify the molten metal. 7 has a V-shaped cross-section of an arc surface along the outer periphery of the mold rolls 1 and 2 so that a rectifying action is provided between the mold rolls 1 and 2. Insert the melt outlet 13 downward from the inside to the melt outlet 13
The lower end of a valve stem 20 disposed vertically between both ends in the longitudinal direction of the upper surface of the valve body 19 is disposed so as to close the molten metal outlet 13 between the valve seat 21 on the side and the contact portion 19a. The valve rods 20 are fixed to each other, and the respective valve rods 20 are movably penetrated through the lid 17 of the molten metal tub 6 so as to protrude upward.

Further, as shown in detail in FIG. 2, the opening degree setting device 16 forms a portion of the valve stem 20 protruding above the lid 17 to have a smaller diameter than other portions to form a small-diameter rod portion 20a, A step portion 20b for setting the valve opening is formed at the boundary between the small-diameter rod portion 20a and the valve stem 20, and an upper half of the outer periphery is formed on the outer peripheral portion of the small-diameter rod portion 20a of the valve stem 20. A sleeve 22 for adjusting the valve opening with the cylindrical surface 22a and the lower half of the outer periphery having a screw portion 22b,
The small-diameter rod portion 20a is fitted so as to be slidable in the axial direction, and a worm wheel 25 meshing with a worm 24 stored in a case 23 is mounted on the cylindrical surface 22a via a sliding key 26. The nut 22 fixed in the case 23 is screwed into the screw portion 22b, and the worm 24 is driven to rotate the worm wheel 25. 27 and the lower end of the sleeve 22 and the valve stem
The distance between the 20 and the step 20b can be arbitrarily set as the valve intervention amount E. In the drawing, reference numeral 28 denotes a joint connecting the rod end of the cylinder 18 and the upper end of the valve stem 20.

When continuously casting the thin plate 3 in a belt shape, first, the molten metal outlet 13 provided at the bottom of the molten metal tub 6 is closed by a valve 14, and the molten metal pouring port of the lid 17 is inserted into the molten metal tub 6. The molten metal 7 flows in by utilizing. Thereafter, the valve 14 is operated by the switchgear 15.
Is lifted to open the molten metal outlet 13, and the distance between the contact portion 19a of the valve element 19 and the valve seat 21 of the molten metal outlet 13 (valve opening amount)
Is set in accordance with the gap G, and the molten metal 7 in the molten metal tub 6 flows out from the molten metal outlet 13 and is supplied to the molten metal dam 4 to perform continuous casting. In this case, the operation of opening the valve 14 by the opening / closing device 15 is performed by shortening the operation of the cylinder 18. As a result, the valve body abutted on the valve seat 21
Since the contact portion 19a of 19 is detached from the valve seat 21, the molten metal outlet 13 is opened. Like this, the molten metal tub 6
Can be adjusted simply by opening and closing the valve 14 without raising or lowering the entire molten metal tub 6 and changing the gap S. Thus, for example, the rotational speed of the mold rolls 1 and 2 can be adjusted. Even if it changes, molten metal 7 to molten metal dam 4
Can be adjusted by a simple operation irrespective of a change in the static pressure of the molten metal 7 in the molten metal tub 6.

On the other hand, if the thin plate 3 is cut during the continuous casting operation, the valve 14 is operated by operating the opening / closing device 15.
Is lowered and the distance between the contact portion 19a of the valve element 19 and the valve seat 21 of the molten metal outlet 13 is changed to reduce or stop the outflow of the molten metal 7 in the molten metal tub 6. Therefore, it is not necessary to discharge the entire molten metal 7 in the molten metal tub 6. Therefore, it is easy to deal with the next step.
In the above case, if the valve 14 is pulled down from a state in which the melt outlet 13 is closed and is lowered at a speed higher than the operation at the time of setting the opening degree, the melt outlet 13 is closed rapidly. Since the casting operation can be immediately stopped, the next process can be more easily performed.

Further, when the worm 24 of the opening degree setting device 16 is driven while the valve 14 is closed, the worm wheel 25
Is transmitted to the sleeve 22 via the slide key 26 and the sleeve 22 is simultaneously rotated, so that the screw portion 22 is rotated.
Since the sleeve 22 is entirely moved up and down along the nut 27 screwed to the b, the distance between the lower end of the sleeve 22 and the stepped portion 20b of the valve stem 20 can be determined by selecting the position where the sleeve 22 is moved up and down. That is, the valve opening E can be set. Since the opening of the valve 14 can be set separately from the elevating (opening / closing) operation of the valve 14, the molten metal 7 in the molten metal tub 6 does not flow out. After the valve opening E is set,
When the valve stem 20 is raised by operating the cylinder 18, the sleeve 22
1 until the step 20b of the valve stem 20 abuts on the lower end of the valve 1.
When the valve 4 is raised, the valve 14
Can be opened, and the molten metal 7 in the molten metal tub 6 is discharged to the molten metal outlet 13.
Can be drained more. In the case where the thin plate 3 is cut out during the continuous casting operation with the valve opened, the valve 14 is closed by operating the cylinder 18. By operating at a high speed, the valve 14 can be quickly closed. on the other hand,
Since the position of the sleeve 22 does not change even when the valve 14 is closed in this manner, the cylinder 18 is contracted at a normal speed to operate the valve 14.
Can be easily reset to the valve open state.

Next, FIG. 3 shows a modification of the embodiment shown in FIGS. 1 and 2, in which the sleeve 22 is arranged upside down and the screw portion 22b is screwed into the inner peripheral portion of the worm wheel 25. Then, the cylindrical surface 22a is supported on the inner surface of the case 23 via a sliding key 26 so as to be slidable in the axial direction.

The same effect as that of the embodiment shown in FIGS. 1 and 2 can be obtained in the system shown in FIG.

Next, FIG. 4 shows another example of the opening / closing device 15, in which a screw portion engraved over a required length range at an upper end portion of a valve stem 20 protruding above the lid 17 of the molten metal tub 6 is shown. A worm wheel 30 screwed to the worm 29, a worm 31 meshed with the worm wheel 30, an electric motor 34 connected to a shaft 32 of the worm 31 via a joint 33, and A key (both not shown) is fitted into a key groove provided to extend in the vertical direction, so that the valve stem 20 can be operated only in the vertical direction. The valve body 19 is vertically moved integrally with the valve stem 20 by transmitting the torque transmitted to the screw portion 29 via the worm wheel 30 to the vertical direction by sliding the keyway and the key. The valve 14 is opened and closed by bringing the contact portion 19a of the valve body 19 into and out of contact with the valve seat 21 of the molten metal outlet 13. It is so.

Even when the worm wheel mechanism type opening / closing device 15 shown in FIG. 4 is used, similarly to the embodiment shown in FIGS.
Can be opened and closed.

FIG. 5 shows still another example of the opening and closing device 15.
This is a combination of a cylinder and a link mechanism. That is, the blocks 35 are respectively held at the upper ends of the valve stems 20 protruding above the lid 17 of the molten metal tub 6, and the lower ends are pivotally attached to the brackets 36 on the lid 17 on the left and right sides of each block 35. By pivoting the upper end of the bent link 37
The refraction link 37 bends and expands so that the block 35 and the valve stem 20 can move as a unit in the vertical direction. Attach each guide roller 38
Is engaged with the guide stand 39 erected on the lid 17 so as to freely roll up and down along the guide surface, and furthermore, the bent portion of the bending link 37 is pushed and pulled by a horizontally installed cylinder 41. Connected to the operating lever 40
Pushing and pulling the operating lever 40 with the expansion and contraction movement of 41 and bending link
By adjusting the bending angle of 37, the block 35 is moved up and down by being guided by the guide stand 39, and the valve body 19 is raised and lowered via the valve rod 20 so that the molten metal outlet 13 can be opened and closed. is there.

In the case of the opening / closing device 15 shown in FIG. 3, the valve 14 can be opened and closed in the same manner as in the embodiment shown in FIGS.

In the above embodiment, the bottom portion of the valve element 19 has a V-shaped cross section having an arcuate surface along the outer peripheral portions of the mold rolls 1 and 2. For example, as shown in FIG. , A V-shape in which the lower surface of the valve element 19 is linear,
Alternatively, as shown in FIG. 10, the cross-sectional shape of the valve element 19 may be substantially rhombic, so that the lower surface may be in direct contact with the valve seat 21.In the embodiment, a pair of mold rolls 1, 2 Although an example of adoption in the case of using a moving mold is shown, a belt-roll type in which one of the moving molds is an endless belt as shown in FIG. 9 or a twin-belt type can be similarly employed. In the embodiment, the case where the opening / closing device 15 is mounted on the lid 17 of the molten metal tub 6 has been described. However, a base may be provided above the lid 17 and mounted on the base. The gap S between the tub 6 and the peripheral surfaces of the mold rolls 1 and 2 may be set to such an extent that it does not flow backward due to the static pressure of the molten metal 7 in the molten metal tub 6, and FIGS. 1 and 2 In the embodiment of FIG. 3 and the embodiment of FIG. Although the case where the operation is performed by the cylinder 18 is shown, the cylinder 18 is used as a balance cylinder so that the step portion 20b of the valve rod 20 is always in contact with the lower end of the sleeve 22. It goes without saying that various changes may be made without departing from the spirit of the present invention.

[Effects of the Invention] As described above, according to the continuous casting apparatus of the present invention, the continuous casting apparatus in which the bottom of the molten metal tub is disposed in the molten metal dam formed at the upper portion between the pair of moving molds. In the apparatus, a valve for opening a molten metal outlet provided with a valve seat at the bottom of the molten metal tub, and opening and closing the molten metal outlet by being in contact with or separated from the valve seat to adjust the outflow amount of the molten metal; and An opening / closing device for opening / closing operation is provided, and furthermore, an opening setting device for setting the opening of the valve is provided so that the opening / closing speed for opening and closing the valve and the position of the valve can be individually set. It has the following excellent effects.

(I) The amount of molten metal flowing out of the molten metal tub can be easily adjusted without raising and lowering the molten metal tub containing the molten metal as a whole, and a large lifting device as in the related art can be eliminated.

(Ii) Even if it becomes necessary to adjust the amount of molten metal supplied to the molten metal dam, it is easy to keep the static pressure of the molten metal in the molten metal dam constant regardless of changes in the static pressure of the molten metal in the molten metal tub. Can be done by operation.

(Iii) The operation of the valve can reduce or stop the outflow of molten metal, so that even if a plate breaks, the next process can be easily handled without discharging the molten metal in the molten metal tub entirely. It can be carried out.

(Iv) Since the opening and closing speed of the valve can be set arbitrarily, the valve can be quickly closed when the plate is cut, so that the casting operation can be immediately stopped and the next process can be more easily performed. Can be.

(V) The opening of the valve can be set without causing the molten metal in the molten metal bath to flow out, whereby the valve opening can be easily reset even if the valve is rapidly closed when the plate is cut. it can.

[Brief description of the drawings]

1 is a cut-away front view showing an outline of an embodiment of a continuous casting apparatus according to the present invention, FIG. 2 is a partially enlarged sectional view of a valve opening / closing device in FIG. 1, and FIG. 3 is a modification of FIG. FIG. 4 is a schematic perspective view showing another example of the opening / closing device, FIG. 5 is a schematic perspective view showing still another example of the opening / closing device, FIG. 6 and FIG.
Each of the figures shows another example of the shape of the valve element used in the continuous casting apparatus of the present invention, and FIGS. 8 and 9 are schematic views each showing an example of a conventional continuous casting apparatus. 1,2 ... mold roll (moving mold), 3 ... thin plate, 4
... Molten dam, 6 ... Molten tub, 7 ... Molten, 11 ... Endless belt (moving mold), 13 ... Molten outlet, 14 ... Valve, 15
…… Opening / closing device, 16 …… Opening degree setting device, 21 …… Valve seat, S…
... a gap.

Claims (1)

(57) [Claims] 1. A continuous casting apparatus in which a bottom of a molten metal tub is disposed in a molten metal dam formed at an upper portion between a pair of moving molds, wherein a valve seat is provided at the bottom of the molten metal tub. A valve for opening the molten metal outlet and opening and closing the molten metal outlet by bringing the molten metal outlet into and out of contact with the valve seat to adjust the flow amount of the molten metal, and an opening / closing device for opening and closing the valve, and further opening and closing the valve A continuous casting apparatus comprising an opening setting device for setting an opening of a valve so that an opening / closing speed and a position of a valve can be individually set.