JPH01254354A - Twin belt continuous casting machine - Google Patents

Abstract

PURPOSE:To prevent surface defect at the time of changing cast slab width and to improve the yield by engaging the whole short side supporting member for short side group with one side of an endless guide rail at inner side or outer side and also engaging a part of supporting member with the other side of the endless guide rail to enable expansion/shrinkage between engaging parts. CONSTITUTION:Two sets of the guide rail of the inner guide rail 12 and the outer guide rail 13 are arranged as doubling to long side face direction of a mold in each right or left short side group 11. Then, the short side supporting member of the whole short side unit in each short side group 11 is engaged with either the inner guide rail 12 or the outer guide rail 13. Further, each short side supporting member for the short side group 11 constituted with number of the short side unit over at least more than length contacting with the cast slab 5 is also engaged with the other guide rail 13 or 12 and the short side group 11 is constituted with two short side unit group (a), (b). Successively, the short side supporting member of the group engaging with both guide rails 12, 13 of the outer and the inner is constituted as expansible/shrinkable and both guide rails 12, 13 are changeable to gap between both.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a twin-belt continuous casting machine, and in particular, the width of a cast metal strip (hereinafter referred to as slab) manufactured during continuous casting is
This invention relates to a twin-belt continuous casting machine that can be changed at right angles without requiring a substantial run-up section.

[Conventional technology]

Recently, various continuous casting machines have been proposed that directly produce slabs from molten steel having a thickness of several millimeters to several tens of inches, which is close to the final shape of a steel product.

Adoption of this type of casting machine makes it possible to save labor in processes and maintenance, and improves energy saving, equipment cost range, casting yield, and material controllability, so development for its practical use is extremely active. is being promoted.

The twin-belt continuous casting machine targeted by the present invention is one such machine. Further, as an example of a twin-belt continuous casting machine, a vertical type device is proposed in Japanese Patent Application Laid-Open No. 61-279341.

This twin-belt continuous casting machine is similar to the conventional continuous casting machine that cast slabs with a thickness of around 300 mm.
In the early stages of development, it was impossible to change the width of the slab during casting. As an example, JP-A-59-189
There is a proposal in Publication No. 047.

Further, as an improvement on this and changing the width of the slab during casting, there is a proposal in Japanese Patent Application Laid-Open No. 60-203345.

[Problem to be solved by the invention]

The proposal in the above-mentioned Japanese Patent Application Laid-Open No. 59-189047 proposes that when changing the width of a slab, a pair of endless metal belts (hereinafter referred to as metal belts) forming the long side surfaces of the mold and a short side surface of the mold are used. , and the injection of molten steel into the mold consisting of the upper and lower two-stage short side group (hereinafter referred to as the short side group) was temporarily stopped.
After lowering the molten steel level to the lower short side group, the position of the upper short side opening is changed to change the width of the mold. After that, injection of molten steel will be resumed and casting work will continue. When using this device, not only does productivity drop due to interruption of injection, but also changes in cooling conditions due to changes in drawing speed and changes in solidification conditions resulting from changes in molten steel, which is a factor in controlling the material properties of steel, occur. Problems arise, such as changes in conditions for preventing the formation of inclusions, flotation conditions, etc.

As a solution πj to this problem,
In the proposal described in Publication No. 0-203345,
In front of the position where the endless short side opening is sandwiched between a pair of metal belts, an inclined guide rail, a parallel guide rail, a moving piece for moving both guide rails, and a drive device for driving the moving piece are provided. It constitutes a width change adjustment device for the short side opening. When changing the slab width, set the moving speed Vg of the parallel guide rail to h / V g > j! /Vc from Vg<
Vc -h/β... Adjust to satisfy (1), move the width adjusting device of the short side group until the endless short side opening is clamped by the metal belt, and adjust the width of the slab. The dimensions are changed and the result is fixed using the clamping force of an endless metal belt.

However, as shown in Fig. 5 of JP-A No. 60-203345, this proposal requires that the run-up section using the inclined guide rail and the parallel guide rail is as long as B = L, and that during this run-up section, The structure is such that there is a surface of the molten steel being injected.

Therefore, in the inclined injection continuous casting machine illustrated in JP-A-60-203345, when the width of the slab is reduced, the width of the slab is reduced until the width-reduced short side group is sandwiched between the metal belts. The solidified shell of the molten steel (hereinafter referred to as shell) is pushed in by the width reduced width by the introduced width-reduced short side group, and wrinkles are generated on the bottom and side surfaces of the slab, which causes defects on the surface of the product. cause it to occur.

In addition, when expanding the width of the slab, a new shell is formed by the width-expanding short-side group on the outside of the shell that has been formed before the width-expanding short-side group is held between the metal belts. This results in double skin, which again causes surface defects in the product.

Therefore, in the inclined injection continuous casting machine disclosed in Japanese Patent Application Laid-Open No. 60-203345, vg! = It is not possible to change the width at high speed like iVC, and it is impossible to change the width at the normal 300m.
V g # (1/100 to 1/100
0) The width change speed remained at XVc. Therefore, it has been long awaited for a continuous casting machine having a mold having a so-called vertical width variable structure that can achieve or exceed the formula (1).

The object of the present invention is to provide a twin-belt continuous casting machine that satisfies the above-mentioned needs.

[Means to solve the problem]

In order to solve the above problems, the present invention eliminates the need to temporarily stop casting, does not require a substantial run-up section,
This invention provides a twin belt continuous casting machine that can change the casting width of a slab at right angles during casting.

The basic constituent means of the twin-belt continuous casting machine of the present invention are a pair of endless metal belts constituting the long sides of a continuous casting mold that is rotatably provided, and each side of the pair of endless metal belts on the left and right sides. In a twin-belt continuous casting machine consisting of a pair of left and right endless short side groups that are sandwiched by the endless metal belt at a required edge position and rotate together with the endless metal belt to form the short side surfaces of the continuous casting mold, In the endless short group of
Two pairs of inner and outer endless guide rails are provided to support each endless short side group and guide each endless short side group at required positions on the right and left edges of the endless metal belt, and the inner and outer endless guide rails are placed at the required positions. drive devices for movement are provided, and all short side support members of the j+Ilj end short side group are engaged with one of the inner and outer endless guide rails, and further, a part of the short side support members of the short side group is also engaged with the other endless guide rail, and the short side supporting member is engaged with either one of the endless guide rails of the endless short side group, and the short side supporting member is engaged with both endless guide rails. The short-side support member of the short-side group, which is composed of two groups and engages with both endless guide rails, is configured to be expandable and retractable between the engaging portions with both endless guide rails. be.

Other basic structural means include a pair of opposing endless metal belts that constitute the long sides of a continuous casting mold that is rotatably provided, and the required positions of the left and right side edges of the pair of endless metal belts. a double-belt continuous casting machine consisting of a pair of left and right endless short side groups connected to a large number of short side units that are sandwiched by the endless metal belt and rotate together with the endless metal belt to form the short side surfaces of the continuous casting mold; In the left and right endless short side groups, two sets of inner and outer sides are provided which support the short side units of each endless short side group from both sides and guide each endless short side group to required positions on the left and right edges of the endless metal belt. Endless guide rails are provided overlappingly in the direction of the long side surface of the mold, moving drive devices are respectively provided to move the inner and outer endless guide rails in the direction of the long side surface, and the endless short side groups are separated into two Divide into short side unit groups, both short side unit groups are composed of short side units consisting of at least a number of short side units corresponding to the contact length with the slab, and each short side unit is carried out from the mold. It consists of a short side block in contact with the cast slab, a mounting member connected to the short side block, and a short side support member supporting the mounting member, and both of the above endless guide rails are attached to either the inner or outer endless guide rail. All short side support members of the short side unit group were engaged, and all short side support members of one short side unit group were also engaged with the other endless guide rail, and both endless guide rails were engaged. The short side support members of the short side units of the group are configured to be extendable and retractable between the engagement portions with both front end guide rails.

Still another configuration means includes a pair of endless metal belts that constitute the long sides of the continuous casting mold and are opposed to each other, and are rotatably provided.
A pair of left and right sides connecting a large number of short side units that are sandwiched between the left and right edges of the pair of endless metal belts at required positions and rotate together with the endless metal belts to form the short side surfaces of the continuous casting mold. In a twin belt continuous casting machine consisting of endless short side blocks, the short side units of each endless short side group are held from both sides by the left and right endless short side groups, and the short side units of each endless short side group are held at required positions on the left and right side edges of the endless metal belt. Three or more sets of endless guide rails for guiding each endless short side group are stacked in five directions on the long side surface of the mold, and all sets of endless guide rails are moved in the direction of the long side surface. Each drive device is provided,
The endless short side group is divided into groups of short side units equal to the number of sets of the guide rails, and the number of short side units obtained by subtracting the number of short side units of each set from the total number of short side units is at least the contact length with the slab. a short-side block having a number of short-side units equal to or more than the number of short-side units, each short-side unit being in contact with a slab carried out from the mold;
It is composed of a mounting member connected to the short side block and a short side support member that supports the mounting member, and the short side support member of the entire short side unit is engaged with any one of the endless guide rails. , all the short side supporting members of each short side unit group other than the first group are also engaged with each of the other different endless guide rails, and the short side of the group that is engaged with the two endless guide rails is The short side support member of the unit is configured to be extendable and retractable between the engagement portions with the front end guide rails.

In a first embodiment, wheels are provided on both sides of the short side support member of the short side group, and the wheels are engaged with a guide groove opened on a side surface parallel to the long side surface of the endless guide rail. The method is to provide guidance on both sides.

In a second embodiment, the endless short side group sequentially connects the short side support members of the short side units of the group engaged with either the inner or outer endless guide rail, and engages with both of the endless guide rails. The short side support members of the short side units of the combined group are sequentially connected, and both ends of the short side support members of both the sequentially connected short side unit groups are respectively connected so as to engage with the guide groove of the inner guide rail. The method is to construct the belt in the form of an endless belt.

As a third embodiment, a clamping material and a clamped material are sequentially arranged to constitute the entire short side support member of an endless short side group, and both the clamping material and the clamped material are placed in a clamping part where they overlap. A shaft that penetrates both materials and rotatably connects the two materials is inserted, wheels are provided at both ends of the shaft, and the wheels are engaged with one of the endless guide rails, and the other endless guide rail. All of the short side support members of the endless short side group that are engaged with each other are configured to be expandable and retractable in a direction substantially perpendicular to the running direction, and a shaft is provided that passes through the expandable short side support members. Wheels are provided at both ends of the shaft, and the vehicle 1 is engaged with the other endless guide rail.

As a fourth embodiment, the guide rail portions of the short side unit and the inner and outer guide rails are substantially symmetrical with respect to the center plane in the width direction of the short side block, and the back surface of the inner guide rail and the outer guide rail The means is to configure the inner surface to be slidable.

As a fifth embodiment, the inner and outer guide rails are provided with an internal space that is open on the side closer to the mold when viewed in cross section,
A guide groove opened on a side surface parallel to the long side surface is provided, and wheels provided on both sides of the short side unit are engaged with the guide groove.

As a sixth embodiment, the width dimensions of the short side blocks and supporting members of the short side units constituting each endless short side group are made approximately equal to the thickness dimension of the slab, and the width dimension of the outer guide rail is set to be approximately equal to the thickness dimension of the slab. The method is to reduce the thickness to below.

[Effect]

As a representative example of the twin-belt continuous casting machine to which the present invention is directed, FIG. 8 shows the configuration of a vertical twin-belt continuous casting machine. This continuous casting machine 100 is installed under a tundish 101, receives molten steel injected from an injection nozzle 102 attached to the bottom surface of the tundish 101 into a mold,
While cooling, it is extruded downward as a slab 5, and the slab 5 is continuously cast by running while being supported by a group of support rolls 60 arranged in multiple stages on the downstream side from the mold. The mold of the continuous casting machine 100 consists of a pair of opposing endless metal belts 1 (in Fig. 8, only the front belt is shown) long side surfaces, and a left and right side consisting of a number of movable short side units described later. It is composed of a pair of endless short side openings 111 and short side surfaces of 112. Furthermore, for detailed structure,
Please refer to the above-mentioned Japanese Patent Application Laid-Open No. 61-279341.

FIG. 1 is an enlarged front view of the mold portion of this continuous casting machine, and is shown in cross section with the endless metal belt 1 in the front removed.

In addition to the arrangement shown in FIG.
1, two sets of inner and outer guide rails consisting of an inner guide rail 12 and an outer guide rail 13 are provided overlappingly in the direction of the long side surface of the mold, and each short side opening 110 is a short side support member of the entire short side unit. is engaged with either the inner or outer guide rail 12 or 13, and the short side opening 11 is constituted by the number of short side units extending at least over the contact length with the slab 5.
Each of the short side support members is also engaged with the other guide rail 13 or 12, and the short side opening 11 is constituted by two short side unit groups a and b, which are engaged with both the inner and outer guide rails 12.13. The short side support members of the group are configured to be expandable and retractable, and the inner and outer guide rails 12 and 13 are configured to be able to change the gap between them. Then, the respective positions and relative positions of the inner guide rail 12 or outer guide rail 13 with which the two groups are engaged and the outer guide rail 13 or inner guide rail 12 with which only the first group is engaged are made independent. By making it possible to change the mold width formed by both short side groups a and b, it becomes possible to change the width of the mold at right angles without requiring a run-up section at the boundary between the two groups.

This continuous casting machine will be explained below with reference to FIGS. 1 to 7.

As shown in FIGS. 1 and 2, each of the two groups of short side units constituting the left and right short side openings includes a short side block 21. It is composed of a mounting member 22 and a short side support member 23. The short-side support member 23 alternately arranges the clamping members 24 and the clamped members 25, and penetrates through both the clamping members 24 and the clamped members 25 at the overlapping part of the clamping members 24 and clamped members 25, and They are continuously connected by a shaft 26 rotatably connecting them and wheels 27 provided on both sides of the shaft 26, forming an endless belt. The above alternating arrangement should also be maintained for the portion where the short side units of both groups are connected, that is, the boundary portion.

As can be seen from FIG. 1, when dividing the left and right endless short side openings into two groups, it is desirable that the lengths of each group are equal (that is, the number of short side units is also equal). Furthermore, even if the number of blocks on the short side is an odd number or half and half cannot be realized due to equipment reasons, it is desirable that they be as close to equivalent as possible. Considering the minimum length of each of the above groups, we find that the contact length of the short side block with the slab, that is, the distance from the molten steel surface to the point where the short side block can release the slab at the bottom end of the mold. The number of short-side blocks corresponding to that distance corresponds to the number obtained by dividing the distance by the height dimension of the short-side block (Fig. 3) and rounding up the value. Conversely, the maximum length is the total length of the endless short side opening minus the minimum length, and it is the remaining value after subtracting the number of short side units corresponding to the minimum length from the total number of short side units. Corresponds to the number of pieces. In practice, it is desirable that the contact length be set to the distance between the upper tension pulley 2 and the lower drive pulley 3 in consideration of the margin.

When each endless short side opening is divided into three or more short side unit groups, each short side unit group is moved in order, so the remaining number is calculated by subtracting the number of short side units for each set from the total number of short side units. The number may be at least equal to the number of short side units corresponding to the contact length between the short side block and the slab. With such a configuration, if you now move the short side units of group A, will all the short side units of group A be slabs?
At a separate timing, that is, during the time when the short side units of groups other than group A are in contact with the slab, the position of the endless guide rail that is responsible for positioning the short side units of group A is changed, and the position of the short side units of group A is changed. Change the position of the short side unit. This is group B,
By repeating the same steps as in the sixth group, the width dimension of the mold can be changed by sequentially moving the short side units of each group.

The inner guide rail 12 and the outer guide rail 13 are:
Since they are arranged as shown in the drawings and FIG. 4, as is particularly clear in FIG. 4, the width dimension Lw of the short side unit is equal to the gap between the endless metal belts 1, that is, the slab thickness B.

Therefore, it is preferable to provide them in an overlapping manner in the direction of the long side of the mold (that is, in the width direction of the slab). In this way, the width of the overlapping portion in the long side direction can be reduced. Therefore, the inner guide rail 12 and the outer guide rail 13
When the center lines of at least the guide rail portions of the outer guide rails 13 are aligned, the width of the guide rail portion of the outer guide rail 13 becomes a representative value (maximum value), which is a desirable condition in terms of design.

Specifically, FIG. 4(a) is a Δ-Δ cross-sectional view of FIG.
It is preferable that the center line 40 passes through the center of the short side block 21 and the mounting member 22 and coincides with the center line or center plane of the guide rail portions of the inner guide rail 12 and the outer guide rail 13. In other words, the short side openings are formed in a substantially symmetrical shape with respect to the center line 40, and the inner guide rail 1
2 and at least the guide rail portions of the outer guide rail 13, preferably up to the movement drive device, are preferably arranged symmetrically.

The inner guide rail 12 and the outer guide rail 13 are each provided with a guide groove 28 that opens in a direction parallel to the long side surface, and engages with the wheels 27 and 32. Since the external force from the slab applied to the short side block 21 is applied to the inner guide rail 12 and the outer guide rail 13 through its wheels 27 and 32, increasing the rigidity of the guide rails 12 and 13 is also an important factor. As a result of various studies regarding this point, the inventors of the present invention found that the inner guide rail 12 and the outer guide rail 13
We have found that it is desirable for the two to be together at all times.

In other words, the back/surface of the inner guide rail 12 and the inner surface of the outer guide rail 13 ensure close contact and, if necessary, have a slidable structure, that is, have a U-shaped cross section as shown in FIG. 4, and contact over a wide area. Mid is that the structure is good.

Considering this as the structure of the guide rail, the inner guide rail 12 and the outer guide rail 13 have an internal space that is open on the side closer to the mold when viewed in horizontal cross section, and the long side surface in the internal space is It is appropriate to have a structure in which guide grooves are opened on parallel side surfaces and wheels provided on both sides of the short side unit are engaged with the guide grooves.

By creating the structure as explained above, the structure shown in Fig. 4 (a
), it has become possible to insert the endless short side opening of the present invention between the endless metal belts 1.

In particular, the structure in which the guide rail portions of the inner guide rail 12 and the outer guide rail 13 are inserted between the metal belts 1 means that the short side block 21 of the short side unit and the support member 23 are inserted between the metal belts 1.
The width dimension of the outer guide rail 13 is to be approximately equal to the thickness dimension B of the slab, and the width dimension of the outer guide rail 13 is to be equal to or less than the thickness dimension of the slab. In this way, it becomes possible to increase the depth of the short side block 21 (as shown in Fig. 3) and significantly increase the amount of width change of the mold when the width is changed once. A remarkable effect can be obtained in which the width variable amount can also be increased. however,
The thinner the manufactured slab is, the more severe the restrictions become, and there also appears to be a limit width for the above structure.

Considering the technical problems of the present invention based on the above considerations,
As mentioned above, the thinner the short side support member is, the more uneven force will be generated unless the acting force and moment applied to the short side unit are properly balanced, resulting in localized wear and abnormal noise. Localized fever, etc. becomes intense.

Therefore, the relationship between the force and moment acting on the short side unit from the slab or molten steel side is added to FIG. 4(a) in FIG. 7. In the same figure, the tip surface 211 of the short side block 21
An even pressure from the slab or molten steel acts perpendicularly to the surface of the short side block 21. It is transmitted to the inner guide rail 12 via the mounting member 22 and the short side support member 23, and F7 and F act as reaction forces from the left and right guide grooves 28 on the center surface 40. central plane 40 and F,
The distance between the acting forces is S/.

When the acting force distance of F3 is SR, the relational expressions between the acting force and the moment are the following equations (2) and (3).

FI-Fz ten FSR...(1) F/ It exists as one.

The present inventors conducted various studies regarding the structure of the short-side unit in order to satisfy the dimensional limitations and at the same time properly balance the acting force and moment acting thereon, and as a result, the following findings were obtained.

■ Two sets of guide rails are placed one on top of the other in the long side direction of the mold, preferably the center lines or center planes of the two sets of guide rails are aligned, and they are arranged symmetrically with respect to the center line or center plane. It is to let.

■ Therefore, each short side unit also has a symmetrical structure,
A structure in which wheels are also provided on both sides and the wheels are engaged from both sides with guide grooves is desirable.

- The short side group is composed of two groups of short side units, all short side units are sequentially connected to form an endless belt, and the structure is such that the short side units of each group can be positioned using guide rails.

Furthermore, in order to satisfy the above findings, we devised the following points regarding the structure of the endless short-sided group.

■ Structure of the short side unit, especially the structure of the short side support member.

■ How to combine the short side support members of the second group of short side units and the two sets of guide rails.

■ Flexible structure that can be used within the short side support member.

■ How to connect the short side units of the 2 groups.

■ Structure of two sets of guide rails.

Based on the results of the study, the essential requirements and additional requirements were sorted out, and the following configuration was determined as a possible structure of an endless short side group.

■ Two sets of guide rails are placed one on top of the other in the long side direction of the mold to form the inner and outer guide rails.

(2) Divide the short-side units constituting the endless short-side group into two or more groups taking the above quantity into consideration.

■ The short side units of both groups are engaged with one guide rail, the front short side unit is engaged with the other guide rail, and the short side support member of the short side unit is engaged with both guide rails. Adopts a telescopic structure.

■ Provide separate positioning devices for the inner and outer guide rails so that they can be operated separately.

A device that combines the above configurations is a structure according to claim 1, and a detailed structure that takes practicality into consideration is a structure according to claim 2. Further, in the structure according to claim 3, each short side unit of the short side group is divided into three or more groups.

Regarding the structure between the short side unit and the inner and outer guide rails,
A structure according to claim 4 is a desirable detailed device devised to balance the acting force and the moment while allowing the short side unit to travel smoothly on a determined trajectory with little backlash. Bearings are preferable for wheels.
Needless to say, it is desirable that the guide groove be close to the outer diameter of the bearing and that there be less gap than necessary.

Regarding the method of connecting the many short side units that make up the short side group, we have adopted an endless belt-like configuration, and all the short side units are divided into two groups, so that the short side units of the two groups can be positioned separately. is the structure according to claim 5.

The structure according to claim 6 makes the detailed structure of the short side support member of the short side unit desirable.

According to claim 7, the desirable basic structure of the inner and outer guide rails is such that it is easy to balance the acting force and moment.
This is the structure described in .

Furthermore, in the structure according to claim 8, the guide grooves in the inner and outer guide rails are of a desirable dual support type.

By specifying the width dimensions of the short side unit and the outer guide rail, it is possible to greatly increase the amount of mold width change per width change, and at the same time, it is possible to increase the continuous cumulative width change amount. The structure according to claim 9 is designed to produce this effect.

Regarding the direction of width expansion or width reduction in the method of changing the perpendicular width of the mold, if the telescoping starting point is placed in the middle of the telescoping stroke, the width of the change can be in either direction, adding or subtracting from the basic width. If the starting point is placed at the maximum width stroke position, only the direction in which the change width decreases with respect to the basic width dimension becomes effective.

Further, when the starting point is placed at the minimum width stroke position, the change width is effective only in the increasing direction with respect to the basic width dimension.

This will be specifically explained using FIG. 5. In Figure 5, if the vertical axis is the time axis and the two groups of short sides are of equal length, the time it takes for the boundary of each short side group to make a half-circle around the endless guide rail is set as τ, and this τ is expressed as a unit. . The horizontal axis is the tip of the short side unit, and the position of the casting surface of the short side block in contact with the slab, the position of the outer guide rail and the inner guide rail, and the position of the short side unit in contact with the slab. The position of the guide rail supporting and positioning the short side block is shown by a solid line, and the position of the guide rail when the short side block is not in contact with the slab is shown by a dotted line. Since the length of each group is half of the total circumference, the time required for the total length of each group to pass through the contact range with the slab is 7 or more as the length of the solid line, and is expressed as 1.4τ in the figure. ing.

When the casting surface position of the short side block is positioned by the outer guide rail, the distance between the casting surface position 0 of the short side block and the outer guide rail position is a fixed length. If the inner guide rail is used for positioning, the distance between the casting surface position of the short side block and the inner guide rail position is the fixed length of the inner guide rail.

The length between the outer guide rails can be expanded and contracted up to 4.
a Regular It L s (!: L 40) Intermediate position L
s C = 'A (L s +L, )].

Now, FIG. 5 shows a time chart of the right endless short side group when the short side group on one side is widened by 180 mm.

If L4L3 = 100 degrees, then 0~ according to Figure 5.
Between τ, the outer guide rail supports the short side blocks of the short side units of the b group, and between r and 2τ, the inner guide rail supports the a group of the short side blocks. Therefore, when the front metal part b of the short side block supported by the outer guide rail separates from the slab (in other words, the state shown by the dotted line),
Move the outer guide rail 50m+n in the direction of the inner guide rail to make the distance between the inner and outer guide rails L3. This τ~
Since the width change of the slab has not yet started between 2τ and the width change amount is zero, the width change amount -0 is written next to the beam line in FIG. Between 2τ and 3τ, group b of the short side blocks supporting the slab at this stage is 1 to 2.
Since it has already moved 501m in 1 hour, the position of the short side block at time 0 is ff1L. It is 50 torsos wider on one side than the other. Therefore, when the boundary between the a group and the b group reaches the molten steel surface, the slab width is expanded by 50 mm on one side. After that, when all of group a of the short side blocks that do not support the slab are separated from the slab, the inner guide rail is set 100+nm away from the outer guide rail, and the inner and outer guide rails are separated.

Make it.

Similarly, between 3τ and 4τ, the outer guide rail is 1
Since the movement is 00+nm, the distance between the inner and outer guide rails is L.
s, and the casting surface position of the short side block is as above. 100mm on one side.

Between 4τ and 5τ, the inner guide rail moves 80 strokes, so the distance between the inner and outer guide rails is L3+80 m, and the position of the casting surface of the short side block is as described above.

However, it is 150mm on one side. Then, between 5τ and 6r, the outer guide rail moves 30m, so the distance between the inner and outer guide rails becomes L3+50+nm=Ls, and the position of the casting surface of the short side block is 1 on one side with respect to L0.
The volume becomes 80ml11, and the mold movement of 180 strokes on each side is completed. Therefore, at the end of changing the mold width dimension, it is necessary that the sum of the amounts of movement of both guide rails be equal.

Further, the operation explained in FIG. 5 is performed in the same manner even when the width of the mold is narrowed.

Therefore, it is desirable to set the distance between L and L1 as large as possible, but in order to do so, as described above, the width of the short side unit or the width of the short side unit and the inner and outer guide rails are reduced, and the pair of The structure must be such that it can be inserted between endless metal belts.

If the short side group on one side changes the maximum width at one time (100
mm) or less, referring to Figure 6, when all the short side units of group b of the short side block supported by the outer guide rail separate from the slab between 1 and 27, , widen the outer guide rail by 30mm.

Between 2τ and 3r, when the short side unit at the head of group b of the short side block reaches the molten steel scene, the slab is 3 on one side.
Spreads 0mm. Then, when all of group a of the short side blocks supported by the inner guide rail are separated from the slab, the inner guide rail is widened by 30 spaces. Then, when the short side unit at the head of group a of the short side block reaches the molten steel surface between 3τ and 4τ, group a of the short side block also expands by 30 mm, so it is the same as group b before it. position and the width change ends here. Therefore, inside.

It can be seen that the outer guide rail completes the movement after 30 strokes each time. Narrowing the width is also carried out in the same manner.

In Figure 5, the explanation was made assuming that the two groups constituting the endless short side group are of equal length. Although it is not necessary to insist on equal lengths, the more the lengths deviate from the equal length, the wider the width change timing width. The only difference is that (the length of time that all the short side blocks of each group are away from the slab) becomes shorter.
Other details are the same as in FIG.

However, in any case, the width dimension can be changed only when the two short side groups a, This is done instantaneously without the need for a run-up at the boundary of b.

As a result, the cause of the occurrence of unsteady width parts of the slab when the width is changed and the causes of occurrence of hot water wrinkles, two-sided skin, etc. on the surface of the slab, which existed in the conventional technology proposed in Japanese Patent Application Laid-Open No. 60-203345, can be eliminated. It disappears.

The above explanation describes the case where an endless short-side group is divided into two short-side unit groups, but when an endless short-side group is divided into three short-side unit groups,
Of course, it is possible to divide the short side units into more than one set. In this case, the principles regarding the mechanism of action that govern the constituent elements can be applied almost unchanged from Group 2 to Groups 3 or more, with only a slightly more complicated structure.

Therefore, regarding the detailed effects, mechanisms, etc. of three or more groups, only the different parts have been explained above, and the other parts have been omitted.

〔Example〕

Embodiments of the present invention will be described below based on FIGS. 1 and 2.

In this example, the present invention is applied to a vertical continuous casting machine.

In Fig. 1, 1 is an endless metal belt forming the long sides of a continuous casting mold, 2 is a tension pulley of the endless metal belt 1, 3 is a drive pulley of the endless metal belt 1, and 4 is a scene of molten steel (also known as the meniscus part). ), 5 is the solidified slab to be carried out.

11 does not show the short side group of the present invention that constitutes the short side surface of the continuous casting mold. This short side group 11 is composed of a left short side group 111 and a right short side group 112, which are arranged symmetrically at required positions on both left and right edges of the endless metal belt l.

12 is an inner guide rail that guides each of the left short side group 111 and the right short side group 112, and 13 is an outer guide rail.

14 is a drive device for moving the inner guide rail 12 left and right, 15
is a drive device for moving the outer guide rail 13 left and right. In this example, hydraulic cylinders are used for both the left and right movement drive devices 14 and 15. 16 is a mounting bracket for the drive unit 214.15 for left and right movement, 17 is each short side group 11
This is a sprocket type rotation drive device that drives 1.112. This rotation drive device 17 is connected to the inner guide rail 12
It is provided so that it can be moved integrally when moving from side to side.

The inner guide rail 12 lacks only the mounting position of the sprocket type rotation drive device 17, leaving the guidance of that part to the sprocket, and has an essentially endless structure like the outer guide rail 13. ing. However, this rotating drive device is not necessarily necessary, and a non-driving type that moves by force from the casting belt and slab may be used.

Short side support members 23 of each short side unit of the left short side group 111 and the right short side group 112, which will be described later, are also engaged with the outer guide rail 13. This engaged state will be explained based on the left short side group 111.

The left short side group 111 in this example is a combination of a large number of short side units, and the left short side group 111 is connected to the inner guide rail 12.
The short side support members 23 of all the short side units are engaged, and the short side support members 23 of the short side units in the range shown by the arrow W are also engaged with the outer guide rail 13, and the left short side group 111
consists of two groups of short side units: a short side group a in which the short side support member 23 is engaged only with the inner guide rail 12, and a short side group A in which the short side group A is engaged in both the inner guide rail 12 and the outer guide rail 13. are doing. This configuration is also the same for the right short side group 112.

The structure in which the short side units of each of the short side groups a and b engage with the inner guide rail 12 and the outer guide rail 13 will be described with reference to FIG. 2.

In the figure, 21 is a short side block of the continuous casting mold, 22 is a mounting member of the short side block 21, 23 is a short side support member connected to the mounting member 22, and 24 is a short side support member of the adjacent short side block 21. A clamping member configured to connect 23, 2
Reference numeral 5 indicates the material to be sandwiched between the sandwiching materials 24, and 26 passes through the weight portion of the sandwiching material 24 and the material to be sandwiched 25.
5 is rotatably inserted into the shaft, and 27 is a wheel attached to both ends of the shaft 26. In this way, each short side unit has a short side block 21. Mounting member 22 and short side support member 2
It consists of 3.

In this example, the guide groove 28 provided in the inner guide rail 12
By inserting the wheels 27 into the inner guide rail 1
2, the short side units of the short side groups a and b are engaged.

In addition, in this example, the short side support member 23 of the short side unit of the short side group a that engages only with the inner guide rail 12 is first connected to the clamping member 24 to the mounting member 22, and the lower part thereof is connected to the clamping member 24. The extension of the material and the connection to the material to be held 25 are arranged alternately. Practically speaking, the present invention is not limited to this, and the clamped material 25 may be connected to the mounting member 22 first, and the extension of the clamped material 25 and the connection to the clamped material 24 may be arranged alternately.

On the other hand, the short side unit of the short side group A that also engages with the outer guide rail 13 is different from that of the short side group a, and as shown in the figure, the clamped material 25 is provided with a third clamping member 24c. The mounting member 22 is provided with a second clamped material 25b, and the second clamped material 25b is held between the third clamping member 24c and the fourth clamping member 24d. The short side support member 23 is constituted by alternately holding every other piece.

A long hole 2 is formed in the second clamped material 25b which is clamped by the third clamping member 24c and the fourth clamping member 24d of the short side unit of the short side group.
9 is provided, and a pin 30 penetrating through this elongated hole 29 is inserted and inserted,
Its both ends are fixed by the third clamping member 24c or the fourth clamping member 24d, and the second clamping member 24b is configured to be slidable and expandable with respect to the second clamping member 24b through the elongated hole 29. A shaft 31 passing through the shaft 31 is provided, and wheels 32 are provided at both ends of this shaft 31. In this way, the short side support member 23 is aligned with the actual direction of travel of the wheel 32. It becomes possible to expand and contract in the direction perpendicular to T.

In this example, the short side unit is engaged with the outer guide rail 13 through a guide groove 281 provided in the outer guide rail 13.
This is done by engaging the wheels 32.

Practically speaking, the structure is not limited to the above structure, and the following structure can also be adopted.

The member connected to the mounting member 22 of the short side unit of the short side group is replaced with the second clamped member 25b and is replaced by a second clamping member, a shaft passing through the second clamping member is provided, and a shaft is provided on both sides of the shaft. In addition to providing a wheel, a pin is inserted and the members sandwiched between the second clamping members are a third clamping member and a fourth clamping member, and both materials are provided with a long hole through which the pin passes, It is configured to be slidable and expandable with respect to the second clamping member through pins and elongated holes, and the two members are arranged every other time, so that the third clamping member becomes the clamping member 25 as it is, and the third clamping member directly serves as the clamping member 25. The fourth clamped material was joined to the clamped material 24 in the middle, passed through the weight part of the clamped material 24 and clamped material 25, and was fitted into the clamped material 24 and clamped material 25 so that they could rotate together. It has a structure in which a shaft 26 is provided and wheels 27 are attached to both sides of the shaft 26.

Then, the short side unit of this example is attached to the outer guide rail 13.
The inner guide rail 12 is engaged with the inner guide rail 12 by engaging the wheel 32 in the guide groove 28, and the inner guide rail 12 is engaged with the inner guide rail 12 by engaging the wheel 27 with the guide groove 28.

With the structure explained above, the short side unit of short side group a is supported and guided only by the inner guide rail 12, so depending on the position of the inner guide rail 12, the short side unit of short side group a is supported and guided by the slab in short side group a. The position of the casting surface 211 of the short side block 21, which is the contact surface, is determined.

The short side units of the short side groups are the inner and outer guide rails 12, 1.
3, the inner and outer guide rails 12.1
3 has a telescopic structure, so the position of the casting surface 211 of the short side block 21 in the short side group is determined by the position of the outer guide rail 13. The distance between the inner and outer guide rails can be changed from one distance to another due to the telescopic structure, and the distance between the inner and outer guide rails is usually adjusted to an intermediate distance.

To help understand Fig. 2, Fig. 3 shows its front view, and Figs. Shown in (d).

FIG. 3 shows a state in which the short side unit of the short side group has a maximum dimension of L3 between the inner and outer guide rails. At this time, the pin 30 is located at the position closest to the short side block 21 of the elongated hole 29. Therefore, if Fig. 3 is an enlarged view of the part directly above the molten steel scene of the left short side group 111 in Fig. 1, when the boundary between short side group a and short side group A reaches the molten steel surface, the mold It can be seen that the width can be expanded at right angles.

The short side units at the two points A-A and B-B of the short side group a in Fig. 3 and the two points C-6 and D-D of the short side group a are shown in Fig. 4 ( Shown in a) to (d).

FIG. 4(a) shows a line passing through the center of the long hole 29 and pin 30 on the center line of the short side block 21 from the axis 26 of the short side unit that engages with the inner guide rail 12 and the center of the wheel 27. This is a cross section along a line that spans a line. A wheel 32 is connected to the guide groove 28 of the inner guide rail 12 via the shaft 26.
The wheel 27 is engaged with the guide groove 28 of the outer guide rail 13 via the shaft 26 at a slightly shifted position, so the wheel 27 is not shown in this figure. etc. are not depicted. The pin 30 is located closest to the short side block 21 of the long hole 29. The outer guide rail 13 is attached to the mounting bracket 16 via the pin 30.
The mounting bracket 16 is connected to the left-right movement drive device 15 via a shaft.

Fig. 4 et al.) are connected to the mounting member 22 from the center line of the shaft 26 and the wheel 27 provided at the weight part of the clamping member 24 and the clamped member 25 of the short side unit at the boundary between the short side group a and the short side group A. It is a sectional view taken along a line spanning the center line of a shaft 31 and a wheel 32 provided on the connected second clamping member 24b. As is clear from this figure, both the guide groove 28 of the inner guide rail 12 and the guide groove 28 of the outer guide rail 13 have a shaft 26.31.
and wheels 27, 32 are engaged in a dual-supported state.

In addition, in the short side group, the structure is such that cross sections AA and cross sections BB are alternately arranged every other section.

FIG. 4(C) shows the short side block 21 of the short side unit at the beginning of the short side group a from the center line of the axis 26 and wheels 27 of the short side unit at the boundary between the short side groups a and 2. FIG. A clamping member 24 connected to the mounting member 22 and an inner guide rail 12
The clamped material 25 through which the shaft 26 of the wheel 32 that is engaged with the guide groove 28 of the wheel passes through is connected by welding. They may be connected by welding. In any case, it has a simpler structure than the cross sections A-A and B-B of the short side group. The inner guide rail 12 and the outer guide rail 1
3 is provided with an internal space that is open on the side closer to the mold when viewed in cross section, and is provided with a guide groove 28 that is open on the side surface parallel to the long side of the mold, and engages the wheel 32. .

FIG. 4(d) shows a line extending from the center line of the shaft 26 and wheel 27 connecting the head of short side group a and the second short side unit to the center line of the second short side unit. FIG. As can be seen from this figure, the short side support member has a very simple structure.

Further, the rear end of the inner guide rail 12 is connected to the mounting bracket 16 via a pin 30.
6 is connected to the drive device 14 for left and right movement via a shaft 26.

In the short side group a, the cross section CC and the cross section D-D are arranged alternately every other section. Further, the short side units at the boundary between the short side group a and the short side group are also slidably connected to each other via the long holes 29, forming an endless short side group.

In addition to this example, conventionally known spline mechanisms, pantograph mechanisms, etc. can also be used as the above-mentioned expansion and contraction mechanism.

With the above structure, in order to change the width dimension of the slab 5 during continuous casting, as explained above with reference to FIG. rail 12
remains as it is, and when the short side unit of the short side group rotates to the non-molten steel injection side, move the outer guide rail 13 in the changing direction (
When the short side unit of the short side group A rotates toward the molten steel injection side, the short side unit of the short side group A moves to the width expansion or width reduction), and when the short side unit of the short side group A rotates toward the molten steel injection side, the short side unit at the boundary between the short side group A and the short side group Change the slab width dimension. After that, when all the short side units of short side group a rotate to the non-molten steel injection side, the inner guide rail 1
2 by the same amount as the changing direction of the outer guide rail 13. Then, even at the boundary between the short side group a and the short side group a, the slab width dimension will be the changed value and there will be no step. Also,
In the present invention, the depth of the short side block 21 (100 mm in this example) regulates the maximum change dimension (allowable change dimension) per width change, so the depth of the short side block 21 is Determine based on the required dimensions per turn.

In this example, when the width was changed 40 times in the range of 10 to 80 mm on one side of the mold, no irregularities in the width of the slab were observed, and there were no wrinkles or double skin, making the slab smooth and stable. 20 to 20
00 ) of molten steel could be continuously cast.

In the example described above, the present invention was applied to a vertical continuous casting machine. However, the present invention can also be applied to other models such as the above-mentioned inclined continuous casting machine. Furthermore, the effects obtained by this application are also the same as in this example.

〔Effect of the invention〕

Since the twin-belt continuous casting machine of the present invention is constructed, operated, and operated as described above, it is possible to change the width of the slab during continuous casting by introducing the injection side, which was previously required. Since there is virtually no need for a run-up section in the section, there is no unsteady part in the width of the slab, and there is no cause for wrinkles, double skin, etc. on the surface of the slab, and the casting yield is significantly increased. The effects obtained are significant, such as improved performance.

Furthermore, since the short side supporting members of all the short side units of the endless short side group are connected in the form of one endless belt, there is no adjustment work between two or more groups, and the continuous casting machine can be used smoothly for a long time. It became. In addition, by supporting each short side unit with the inner and outer guide rails,
Since the acting force and moment can always be balanced, abnormal noise generation and local wear are significantly suppressed, extending the service life and making maintenance easier.

The structures of the short-side unit and the inner and outer guide rails are symmetrical, and the back surface of the inner guide rail and the inner surface of the outer guide rail are able to slide, resulting in a good balance between acting force and moment, as well as rigidity against external forces. This has made it possible to reduce structural play, improving reproducibility and accuracy of operation.

As mentioned above, by specifying the width dimension of the short side unit, the amount of change per mold width change can be greatly increased, and the continuous cumulative width change amount can also be increased accordingly. Not only can the time required for the change be shortened, but it is also possible to shorten the length of the slab in a transient situation accompanying the width change.

As a result, the yield is further improved.

[Brief explanation of the drawing]

Fig. 1 is a front view illustrating the configuration of a vertical continuous casting machine used in an embodiment of the present invention, and Fig. 2 is a state of engagement between the short side unit of each short side group and each guide rail in the embodiment of the present invention. FIG. 3 is a front view of FIG. 2, FIG. 4 is a sectional view taken along lines A-A, BB, CC, and D-D in FIG. 3, and FIG. 6 is a time chart showing the movement of the moving short side in the present invention, FIG. 7 is a force relationship diagram in which the force acting on the cross section 8- in FIG. 4 is drawn, and FIG. 8 is a vertical type twin FIG. 1 is an overall schematic diagram of a belt-type continuous casting machine. Figure 2 29: Long hole Figure 3 211: Casting 1! i@

Claims (1)

[Scope of Claims] 1. A pair of endless metal belts constituting the long side surfaces of a continuous casting mold that is rotatably provided, and a pair of endless metal belts at predetermined positions on each left and right side edge of the pair of endless metal belts. In a twin-belt continuous casting machine consisting of a pair of left and right endless short side groups which are sandwiched between and rotate together with the endless metal belt to form the short side surfaces of the continuous casting mold, each of the left and right endless short side groups includes:
Two pairs of inner and outer endless guide rails are provided to support each endless short side group and guide each endless short side group at required positions on the right and left edges of the endless metal belt, and the inner and outer endless guide rails are placed at the required positions. A drive device for moving is provided respectively, and all the short side support members of the endless short side group are engaged with either the inner or outer endless guide rail, and further the short side support members of a part of the short side group are engaged with the endless guide rail of either the inner or outer side. Also engage the other endless guide rail,
The endless short side group is composed of two groups: a group in which a short side support member is engaged with one of the endless guide rails, and a group in which the short side support members are engaged in both endless guide rails, and both endless A twin belt continuous casting machine characterized in that the short side supporting members of the short side groups that engage with the guide rails are configured to be expandable and contractible between the engaging portions with both endless guide rails. 2. A pair of opposing endless metal belts constituting the long sides of a continuous casting mold that is rotatably provided, and a metal belt that is sandwiched between the endless metal belts at required positions on each of the left and right side edges of the pair of endless metal belts. In a twin-belt continuous casting machine consisting of a pair of left and right endless short side groups connected to a large number of short side units that rotate together with an endless metal belt and constitute the short side surfaces of the continuous casting mold, the left and right endless short side groups Then, on the long side of the mold, two sets of endless guide rails, one for supporting the short side unit of each endless short side group from both sides and for guiding each endless short side group to the required positions on the right and left edges of the endless metal belt, are attached to the long side of the mold. Layered in the direction of the surface,
A moving drive device is provided for moving the inner and outer endless guide rails in the direction of the long side surface, and the endless short side group is divided into two short side unit groups, and both short side unit groups are made of at least a slab. The short-side unit is composed of a number of short-side units equal to or more than the contact length with the mold, and each short-side unit is connected to a short-side block in contact with the slab to be carried out from the mold, and to the short-side block. a mounting member,
a short side support member that supports the mounting member, all the short side support members of both of the short side unit groups are engaged with either the inner or outer endless guide rail, and further one of the short side unit groups all the short side support members of the group are also engaged with the other endless guide rail, and the short side support members of the short side units of the group that are engaged with both endless guide rails are connected between the engagement parts with both endless guide rails. A twin belt continuous casting machine characterized by being configured to be expandable and contractible. 3. A pair of opposing endless metal belts constituting the long sides of a continuous casting mold that is rotatably provided, and a metal belt that is sandwiched between the endless metal belts at required positions on each of the left and right side edges of the pair of endless metal belts. In a twin-belt continuous casting machine consisting of a pair of left and right endless short side groups connected to a large number of short side units that rotate together with an endless metal belt and constitute the short side surfaces of the continuous casting mold, the left and right endless short side groups Then, three or more sets of endless guide rails are attached to the long sides of the mold to sandwich the short side units of each endless short side group from both sides and guide each endless short side group to desired positions on the right and left edges of the endless metal belt. Layered in the direction of the surface,
A moving drive device for moving all the sets of endless guide rails in the direction of the long side surface is provided, and the endless short side group is divided into short side unit groups equal to the number of sets of the guide rails, and all the short side units are The number of short side units obtained by subtracting the number of short side units in each set from the number of short side units is at least equal to the number of short side units corresponding to the contact length with the slab, and each short side unit is consists of a short side block in contact with the slab carried out from the mold, a mounting member connected to the short side block, and a short side support member that supports the mounting member, and any one of the endless guide rails The short side supporting members of all the short side units are engaged with the short side supporting members of all the short side units, and all the short side supporting members of each short side unit group other than the first group are respectively engaged with each of the other different endless guide rails. A twin belt continuous casting machine characterized in that the short side support members of the short side units of the group that are brought together and engaged with the two endless guide rails are configured to be expandable and contractible between the engaging portions with both the endless guide rails. . 4. Wheels are provided on both sides of the short side support member of the short side group according to any one of claims 1 to 3, and the wheels are installed in a guide groove opened on a side surface parallel to the long side surface of the endless guide rail. A twin belt continuous casting machine characterized by guiding on both sides by engaging. 5. The endless short side group according to any one of claims 1 to 4 sequentially connects the short side support members of the short side units of the group engaged with either the inner or outer endless guide rail, and Sequentially connect the short side support members of the short side units of the group engaged with the endless guide rail, and engage both ends of the short side support members of both sequentially connected short side unit groups with the guide grooves of the inner guide rail. A twin-belt continuous casting machine characterized in that the two belts are connected to each other to form an endless belt. 6. A clamping material and a clamped material are sequentially arranged to constitute the entire short side support member of an endless short side group, and a clamping part where both the clamping material and the clamped material overlap is penetrated through both materials. A shaft for rotatably connecting the materials is inserted, wheels are provided at both ends of the shaft, and the wheels are engaged with either one of the endless guide rails and the other endless guide rail. All the short side support members of the endless short side group are configured to be expandable and retractable in a direction substantially perpendicular to the running direction, and a shaft is provided that passes through the expandable short side support members, and wheels are provided at both ends of the shaft. The twin belt continuous casting machine according to any one of claims 1 to 5, characterized in that the twin belt continuous casting machine is provided with a wheel, and the wheels are engaged with the other endless guide rail. 7. The guide rail portions of the short side unit and the inner and outer guide rails are substantially symmetrical with respect to the center plane in the width direction of the short side block, and slide on the back surface of the inner guide rail and the inner surface of the outer guide rail. The twin-belt continuous casting machine according to any one of claims 1 to 6, characterized in that the double-belt continuous casting machine is configured to be capable of casting. 8. The inner and outer guide rails are provided with an internal space that is open on the side closer to the mold when viewed in cross section, and provided with a guide groove that is open on the side surface parallel to the long side surface, and the short side unit is inserted into the guide groove. The twin-belt continuous casting machine according to any one of claims 1 to 7, characterized in that wheels provided on both sides of the double-belt continuous casting machine are engaged with each other. 9. The width of the short side blocks and supporting members of the short side units constituting each of the endless short side groups shall be approximately equal to the thickness of the slab, and the width of the outer guide rail shall be equal to or less than the thickness of the slab. A twin-belt continuous casting machine according to any one of claims 1 to 8.