JPH0438932Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a cooling water sealing device for a belt-type continuous casting machine that casts flat slabs having rectangular cross-sectional shapes or square or round side surfaces.

[Prior Art] A belt-type continuous casting machine is one of the casting machines for casting slabs having a rectangular or flat cross-sectional shape.

This belt-type continuous casting machine includes one or a pair of opposing endless casting belts wound around at least an upstream roll and a downstream roll, and a belt drive device that rotates the casting belt in the slab drawing direction. , 1 placed near both ends of the casting belt in the width direction
It is equipped with a pair of short side molds. The side surfaces of the short mold are in contact with the casting belt surface to form a mold. The belt-type continuous casting machine also includes a cooling device that supplies cooling water for cooling between the short-side molds to a surface of the casting belt opposite to the surface that contacts the molten metal, and a cooling device that supplies cooling water for cooling between the short-side molds, and It is also equipped with a pressing device for pressing. The pressing device is equipped with a hydraulic cylinder, a pneumatic cylinder, a spring mechanism, etc., and presses the casting belt against the sides of the short-side mold to bring both sides into close contact, thereby preventing leakage of hot water from the mold.

In the belt-type continuous casting machine configured as described above, molten metal is injected into the mold while the casting belt is rotated in the slab drawing direction by the drive device, and slabs with a rectangular or flat cross-sectional shape are continuously cast. do. Rotating the short side mold in the same way as the casting belt is also practiced.

Such a belt-type continuous casting machine is disclosed in, for example, Japanese Patent Application Laid-Open No. 50-61332, Japanese Patent Application Laid-Open No. 50-89218,
This is disclosed in Japanese Patent Application No. 62-310596 and others.

According to a belt-type continuous casting machine, a flat slab having a thickness of several mm to several tens of mm, which is close to the final shape, can be directly manufactured from molten metal such as molten steel. Therefore, multi-step rolling processes such as rough rolling and intermediate rolling can be omitted in the production of metal thin strips, thereby simplifying the process and equipment. Furthermore, since there is no need for a heating process for the material between each process, an energy saving effect can also be expected.

[Problems to be solved by the invention] In belt-type continuous casting machines, the casting belt is water-cooled during casting. Water cooling is performed by directly supplying cooling water from a nozzle or the like to the back surface of the casting belt (the surface that does not come in contact with molten metal). If cooling water leaks from the width of the slab toward the side edges, the temperature at both ends of the casting belt will drop, causing belt deformation to become large, and the molten metal leaking from the mold will turn into a molten metal, resulting in an operational stoppage and equipment failure. There is a risk of causing Especially in molds with variable slab width, the short side mold also slides in the long side direction of the mold.
Cooling water easily leaks from sliding parts, and there is a high risk of hot water leaking.

Furthermore, in recent years, a technique for heating both end portions of a casting belt has been adopted, so the importance of this problem has increased.

However, in conventional belt-type continuous casting machines, especially the cooling water sealing device, the entire contact surface of the sliding member of the pressing device is flattened and the entire surface is made of a metal surface or a packing material is pasted. Water leakage prevention was not sufficient, and in the latter case, the packing material deteriorated and wore out quickly.

Therefore, the present invention aims to provide a cooling water sealing device capable of sealing the cooling water of a casting belt with high sealing performance and durability.

[Means for Solving the Problems] This invention provides a belt-type continuous casting machine in which the pressing device is provided with a sliding part on which the casting belt slides along the slab drawing direction, and the casting belt in the sliding part is A surface member that receives the pressing force from the casting belt and a seal member that suppresses the flow of cooling water to both ends of the casting belt are provided in the width direction of the surface in contact with the casting belt, respectively, in the slab drawing direction.

In the sliding part, a packing groove having a slit opening in the sliding surface along the direction of drawing out the slab is cut along the direction of drawing out the slab, and a string-shaped lip packing is cut so that the lip passes through the slit. Install it in the gasket groove.

The belt-type continuous casting machine in which this idea is implemented is
The cast belt may be a single belt or a double belt. Further, the casting belt may be placed horizontally, inclinedly, or vertically. moreover,
The short side mold may be a so-called moving short side mold that rotates in the same way as the casting belt, or the position of the short side mold may be variable depending on the width of the slab.

The cast belt is generally made of a steel plate, but the sliding part of the pressing device is preferably made of a metal material such as a copper alloy, a carbon-based composite material, or a resin-based material, which is slightly softer than the steel plate. This is because the sliding part needs to have sufficient strength to support the cast belt, and also to reduce the frictional force between it and the cast belt and prevent seizure.

A flexible material such as rubber or plastic is suitable for the lip seal in terms of sealing performance and durability. The cross-sectional shape of the main body of the lip packing may be any shape such as a square, a circle, or an oval. The length of the lip protruding from the packing body is such that when the lip packing is installed in the packing groove, the tip of the lip slightly peeks out from the sliding surface.

[Operation] The load of pressing the casting belt against the short-side mold is borne by the sliding part of the pressing device. Therefore, no load is applied to the seal member, and wear of the seal member due to sliding is reduced.

The cooling water supplied to the back surface of the casting belt flows along the longitudinal direction of the belt (the direction in which the slab is pulled out), but a portion of the cooling water flows in the width direction of the belt. The cooling water flowing in the belt width direction is sealed by a sealing member in contact with the cast belt.

[Example] An example will be described by taking as an example a cooling water sealing device installed in a twin-belt continuous casting machine for manufacturing wide thin steel slabs as shown in FIG.

FIG. 7 is a diagram schematically showing a twin-belt continuous casting machine. In this continuous casting machine, molten steel M in a tundish 1 is supplied from a flat nozzle 2 to a mold 4. This mold 4 is constructed by forming short-side molds 1 on both sides of the opposing gap between a pair of belts 6 made of a heat-resistant material such as steel that run across rolls 7 to 9.
It is formed by partitioning with 1. Drive including electric motor and reducer (not shown)
The upstream roll 7 or the downstream roll 8 is rotationally driven, and the casting belt 6 is rotated in the slab drawing direction (from top to bottom at the point where it contacts the slab in FIG. 7) according to the casting speed. do. The short side mold 11 is composed of a large number of blocks connected endlessly. The short side mold 11 is rotated in the slab drawing direction V similarly to the casting belt 6 by a fixed device or a short side drive device (not shown). Note that the short side mold 11 is movable in the mold width direction by a slab width variable device.

The molten steel M poured into the mold 4 is transferred to a cooling device 1 consisting of a jet cooling section 16 and a pad cooling section 17.
It is cooled by 5, becomes a flat slab S, and is carried out.

In this cooling device 15, since the static pressure of the molten steel M is low in the jet cooling section 16 at a certain depth from the meniscus m, the cooling water cools the back surface of the belt 6 as a jet jet. That is, cooling water header 1
A cooling water pipe 20 extends from 9 to just below the molten metal level m in the mold along the circumferential surface of the upstream roll 7. A plurality of such cooling water pipes 20 are arranged at intervals in the roll axis direction (the long side direction of the mold). The tip of each cooling water pipe 20 is a nozzle 21, which supplies cooling water to the back surface of the casting belt 6.

A pad cooling section 17 is provided below the jet cooling section 16 because the static pressure of the molten steel M is high, and inside this cooling section, the belt 6 resists the static pressure of the molten steel M and forms a mold space. The structure is such that necessary cooling water can be flowed by adjusting the pressure on the inlet and outlet sides of the cooling section 17. Note that the water pressure of the cooling water is adjusted so as to be balanced with the pressure caused by the molten steel head.

A casting belt support device 3 is installed directly below the upstream roll 7.
1 is placed. Casting belt support device 31
As shown in FIG. 1, a support shaft 34 extending in the longitudinal direction of the mold is rotatably supported by a pedestal 32. A plurality of support plates 35 having bosses 36 are fitted onto the support shaft 34 so as to be slidable in the axial direction. The support plate 35 supports the casting belt 6 from the back side thereof. In addition, the support shaft 34 has a diameter of 90 mm in the circumferential direction.
Four key grooves (not shown) are cut at intervals of about 100 degrees along approximately the entire length of the shaft. Four sliding keys are fitted into four key grooves between adjacent support plates 35, respectively. The sliding key (not shown) is also fitted into a key groove (not shown) provided in the boss 36 of the support plate 35, and connects adjacent support plates 35. The method of connecting the support plates 35 using the sliding keys is as follows. That is, the sliding keys are arranged in pairs spaced apart by 180 degrees in the circumferential direction. That is, there is a first pair of sliding keys and a second pair of sliding keys spaced apart by 90 degrees in the circumferential direction. For example, two support plates 35 connected by a first pair of sliding keys are each connected to another adjacent support plate 35 by a second pair of sliding keys.

Pressing blocks 41 are fitted to both ends of the support shaft 34 so as to be slidable in the axial direction.

A sliding portion 43 extending in the slab drawing direction is attached to the pressing block 41 via a spring 42. The sliding portion 43 is made of copper alloy. As shown in FIGS. 3 and 4, the sliding portion 43 is provided with a packing groove 45 having a slit 46 that opens in the sliding surface 44 along the slab drawing direction V.
3 along the slab drawing direction V. A lip packing 48 is installed in the packing groove 45 so that the lip 49 passes through the slit 46. The lip packing 48 is made of synthetic rubber. The sliding portion 43 is pressed against the casting belt 6 by the spring 42 .

The short side mold 11 is moved in the mold width direction H by the slab width variable device 12 according to the required slab width. In order to prevent molten steel M from leaking from the gap between the casting belt 6 and the short-side mold 11, the sliding portion 43 is always located at the short-side mold 11 and presses the casting belt 6 against the side surface of the short-side mold 11. . The pressing block 41 and therefore the sliding portion 43 are moved along the support shaft 34 by the drive device 52 in accordance with the movement of the short side mold 11. At this time, the support plate 35 adjacent to the pressing block 41 is pushed or pulled by the pressing block 41 and moves. Since the other support plates 35 are connected by sliding keys as described above, they move in the same manner. Figure 1 shows the state in which a slab of maximum width is being cast.

The sliding portion 43 is pressed against the casting belt 6 by the spring 42, and the sliding surface 44 supports the casting belt 6 from the back side. Therefore, when installed, the sliding surface 44
The lip 49 of the lip packing 48, which had been slightly protruding from the lip, is elastically deformed and enters the slit 46, and an appropriate sealing surface pressure is generated between the tip of the lip and the back surface of the casting belt 6. Also, lip 49
Do not apply excessive force to. As a result, as shown in FIG. 3, the casting belt 6 slides against the lip 49 in the slab drawing direction V and the long side direction H of the mold, but the lip packing 48 prevents the cooling water from leaking in the long side direction H of the mold. Prevent over a long period of time.

FIG. 4 is a sectional view of the mold 4 including the casting belt support device 55 in the pad cooling section 17 in FIG. A plurality of pressing blocks 57 are arranged near the side ends of the casting belt 6 in the width direction, and the pressing blocks 57 are moved back and forth via rods 59 by eccentric cams (not shown). When the position of the short side mold 11 is determined by the width variable device 12, the pressing blocks 57 at appropriate positions according to the determined position press the casting belt 6 from both sides. In the case of FIG. 4, the fourth pressing block 57 from the side end presses the short side mold 11 from above and below via the casting belt 6. The sliding member 58 of the pressing block 57 has a structure similar to that shown in FIGS. 2 and 3 above.

FIG. 5 shows another embodiment of a cross-sectional view of the sliding member of the pressing block similar to that shown in FIG. . FIG. 6 shows yet another embodiment, in which the lip packing 48 and the sliding member 66 of the pressing block 65 are joined.

[Effects of the invention] According to this invention, the load of pressing the casting belt against the short-side mold is borne by the sliding portion of the pressing device. Therefore, no load is applied to the seal member, the wear of the seal member due to sliding is reduced, and leakage of cooling water can be prevented for a long period of time.

[Brief explanation of the drawing]

Fig. 1 is a horizontal sectional view of a casting belt support device in jet cooling, Fig. 2 is a sectional view of a sliding member of a cooling water sealing device, Fig. 3 is a perspective view of a sliding member of a cooling water sealing device, and Fig. 4 is a perspective view of a sliding member of a cooling water sealing device. The figure is a horizontal sectional view of the cast belt support device in the pad cooling section, FIGS. 5 and 6 are sectional views showing other embodiments of the sliding member of the cooling water seal device, and FIG. 7 is the cooling device of this invention. 1 is an overall schematic diagram of a twin-belt continuous casting machine equipped with a water seal device. DESCRIPTION OF SYMBOLS 1...Tandate dish, 2...Flat nozzle, 4...Mold, 6...Casting belt, 7...Upstream roll, 11...Short side mold, 12...Width variable device, 20...Water cooling pipe, 21... ...Nozzle, 34...
Support shaft, 35...Support plate, 41...Press block, 42...Spring, 43...Sliding portion, 44...Sliding surface, 45...Packing groove, 46...Slit,
48...Lippuskin, 49...Lipp, M...
...molten steel, m...molten metal surface.

Claims (1)

[Claims for Utility Model Registration] 1. One or a pair of opposing endless casting belts wound around at least an upstream roll and a downstream roll, and a belt drive device that rotates the casting belt in the slab drawing direction. and a pair of opposing short-side molds disposed near both ends of the casting belt, the side surfaces of the short-side molds contacting the casting belt surface to form a mold, and further contacting the molten metal of the casting belt. In a continuous casting machine equipped with a cooling device that supplies cooling water to the surface opposite to the surface and a pressing device that presses the casting belt against the side surface of the short-side mold, a sliding part on which the casting belt slides is provided. The pressing device is provided with a packing groove having a slit that opens in the sliding surface along the direction of pulling out the slab, and is cut in the sliding part along the direction of pulling out the slab, and the lip passes through the slit. A cooling water sealing device for a belt-type continuous casting machine, characterized in that a string-like lip seal is installed in a seal groove in a manner such that the lip seal is attached in a seal groove. 2. One or a pair of opposing endless casting belts wrapped around at least an upstream roll and a downstream roll, a belt drive device that rotates the casting belt in the slab drawing direction, and a large number of blocks arranged in an endless shape. a pair of opposing short side molds connected to;
and a short-side drive device that rotates the short-side mold in a slab drawing direction, and the position of the short-side mold is varied according to the width of the slab, and the side surface of the short-side mold is in contact with the casting belt surface. A continuous casting machine that forms a mold and further includes a cooling device that supplies cooling water to the surface of the casting belt opposite to the surface that contacts the molten metal, and a pressing device that presses the casting belt against the side surface of the short side mold. The pressing device includes a sliding part on which the casting belt slides, and a packing groove having a slit opening in the sliding surface along the direction of drawing out the slab is provided in the sliding part in the direction of pulling out the slab. 1. A cooling water sealing device for a belt-type continuous casting machine, characterized in that a string-like lip packing is installed in the packing groove so that the lip is cut along the slit and the lip passes through the slit. 3. The cooling water sealing device for a belt type continuous casting machine according to claim 1 or 2, wherein the pressing device is provided within a cooling pad.