JPH0216182B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a horizontal continuous casting apparatus.

In horizontal continuous casting equipment, the static pressure of molten steel in the tundish acts on the solidified shell in the mold, generating a large frictional force between the inner wall of the mold and the solidified shell. Therefore, a large axial force is generated in the slab between the mold and the pinch roll due to the pull-out drive of the pinch roll. When a sliding gate is to be interposed between the tundish and the mold, it is necessary to maintain the contact pressure between both surfaces of the sliding plate that moves within a vertical plane within a certain range. Otherwise, when the contact pressure is too high,
If the contact pressure is too low, it may become difficult to move the slide plate, the slide plate may be crushed, or excessive wear may occur.On the other hand, if the contact pressure is too low, there is a risk of molten steel leaking.

In the prior art, the tundish, mold, and pull-out device are arranged in this order at fixed positions, and even if an attempt is made to insert a sliding gate between the tundish and the mold, one side of the sliding plate cannot be moved with a constant force. Even if it is possible to press, it is impossible to maintain constant contact pressure on both sides. On the other hand, it is conceivable to press the entire mold toward the sliding gate, but this mold is affected by the above-mentioned pulling force, so it is impossible to keep the contact pressure constant.

Further, in general, horizontal continuous casting equipment performs so-called intermittent drawing, in which pinch rolls pull out the slab in a direction away from the mold, and then temporarily push it back toward the mold. This intermittent withdrawal makes the solution for keeping the contact pressure constant even more difficult.

An object of the present invention is to provide a horizontal continuous casting apparatus that allows a sliding gate to be placed between a tundish and a mold.

FIG. 1 is an overall assembly diagram of an embodiment of the present invention. Molten steel from ladle 1 is supplied to tundish 2. The molten steel 3 in the tundish 2 flows from a tundish nozzle 4 provided on the lower side wall of the tundish 2 to a sliding gate 5.
and is guided to the mold 7 through the connecting pipe 6.
The billet 8, which has been cooled by the mold 7, is cooled by a secondary cooling device 9, and is drawn out by a drawing device 10 in a drawing direction 11. The tundish 2 is mounted in a fixed position by a pedestal 12. sliding gate 5
is a slide plate 13 that moves up and down in a vertical plane.
, contact plates 14 and 15 that contact both sliding surfaces of the slide plate 13, and a drive cylinder 16 that drives the slide plate 13 up and down. The connecting pipe 6 comes into contact with the surface of the sliding contact plate 15 on the side opposite to the slide plate 13 . The connecting pipe 6 is fixed to the mold 7. A break ring 17 is provided near the boundary between the connecting pipe 6 and the mold 7. The mold tube 18 of the mold 7 is cooled by cooling water supplied from the inlet 19 and discharged from the outlet 20. The secondary cooling device includes a nozzle 21 that injects cooling water, etc.
It includes a support roller 22 that supports the billet 8 and the like. The drawing device 10 has pinch rollers 23-26 that contact the outer surface of the billet 8. roller 2
3 and 24 are supported by arms 27 and 28, respectively, and push down the billet 8 downward by pressing cylinders 29 and 30, and pinch rollers 25 and 26
The billet 8 is held between. pinch roller 2
5 and 26 are supported on a pedestal 31 and driven by a motor 32 that can rotate in forward and reverse directions.

According to the concept of the present invention, the mold 7 to which the connecting pipe 6 is fixed, the secondary cooling device 9, and the pulling device 10 having the pinch rollers 23 to 26 are
Fixed loading on 3. This truck 33 is mounted on a track 34 laid horizontally and parallel to the pulling direction 11.
At the top, it is arranged so that it can move forward and backward to the left and right in FIG. This trolley 33 has wheels 35 that move on a track 34,
36. The truck 33 has a connecting cylinder 3
7 is fixed, and a connecting rod 38 is driven by this connecting cylinder 37. An engagement hole 39 is formed at one end of the connecting rod 38 . Frame 1
A fixing cylinder 40 is fixed to the fixing cylinder 2 , and an engagement rod 41 driven by the fixing cylinder 40 is inserted into the engagement hole 39 . In this way, displacement of the connecting rod 38 along the axial direction is prevented.

FIG. 2 is a plan view of the embodiment shown in FIG. This horizontal continuous casting apparatus has a plurality (three in this example) of strands, each having corresponding components indicated with suffixes a, b, and c. In the following explanation, subscripts a, b, c
Explanations will be given using reference marks without subscripts that collectively refer to the following.

Referring to FIG. 3, in the extraction device 10, the time t1
~t2, the motor 32 moves the pinch roller 25,
26 is driven to pull the billet 8 in the drawing direction 11, the billet 8 is stopped at time t2 to t3, and the pinch rollers 25 and 26 are temporarily driven in the opposite direction to the drawing direction at time t3 to t4, and the billet 8 is pulled in the drawing direction 11 from time t4 to t4. Stops again at t5. In this way, a so-called intermittent drawing operation is performed from time t1 to time t5. In the present invention, although an intermittent drawing operation as shown in FIG. 3 may be performed, the drawing device 10 may be designed to constantly pull out the billet 8 only in the drawing direction 11.

FIG. 4 is an enlarged vertical sectional view of the vicinity of the sliding gate 5, and FIG. 5 is a horizontal sectional view of the vicinity of the sliding gate 5. Slide plate 1
3 consists of a plate-like body 45 made of a refractory material and a frame body 46 surrounding the plate-like body 45. The sliding contact plate 14 is
It is fixed to a support body 49. This support body 49 is fixed to the iron skin 48 of the tundish 2. The support body 49 has guide legs 50 extending toward the connecting pipe 6 on both sides of the slide plate 13 (up and down in FIG. 5),
It has 51. The support member 52 is the slide plate 13
It has guide pieces 53 and 54 interposed between the frame body 46 and the guide legs 50 and 51. This support member 5
2 surrounds the outer periphery of the sliding contact plate 15 and the surface on the connecting pipe 6 side with a surrounding piece 55. Notches 56, 57 are formed on both sides of the support member 52, and spring receivers 58, 59 having spherical seats are seated in the notches 56, 57. Holding rods 60, 61 into which notches 56, 57 and spring receivers 58, 59 are loosely inserted
One end of the support body 49 is connected to the support body 49 by pins 62 and 63.
is supported by Spring receivers 64 and 65 are screwed onto the other ends of the holding rods 60 and 61.
A spring 66 is interposed between the spring receivers 58 and 64. Similarly, a spring 67 is placed between the spring receivers 59 and 65.
is intervened. In this manner, the support member 52 and therefore the surrounding piece 55 are urged toward the slide plate 13 by the spring force of the springs 66 and 67. A plurality of these springs 66 and 67 are provided around the surrounding piece 55 so that the contact pressure acting on the sliding surface of the slide plate 13 is equalized.

Connection cylinder 37 attached to truck 33
Due to the tensile force of the connecting rod 38, the connecting pipe 6
is pressed against the sliding contact plate 15 side at the joint surface 68 to the extent that molten steel does not leak from the joint surface. By appropriately setting the driving force of the connecting cylinder 37, the pressure force between the connecting pipe 6 and the sliding contact plate 15 can be adjusted. Slide plate 13 and sliding plate 14,1
The contact forces with 5 are almost equal, and these contact forces are:
This is the sum of the pressing force by which the connecting pipe 6 is pressed against the sliding contact plate 15 and the spring force by the springs 66 and 67. The value of this sum is determined so that the slide plate 13 can move up and down smoothly, and the plate-shaped body 4 of the slide plate 13
5 and the sliding contact plates 14, 15 are crushed or worn excessively, or the sliding plate 13 and the sliding contact plates 14, 1
The value is selected to prevent molten steel from leaking from the sliding surface with 5. The connecting rod 38 is provided with a detector capable of sensing the force acting in the axial direction of the connecting rod, such as a strain gauge, and the supply pressure of the connecting cylinder 37 is controlled.
Sliding surface of sliding gate 5 and connecting pipe 6
It is effective to keep the pressing pressure of the joint surfaces constant.

According to this embodiment, the mold 7 and the pulling device 10 including the pinch rollers 23 to 26 are
The billet 8 is fixedly loaded on a truck 33, and a large frictional force is generated between the inner wall of the mold tube 18 of the mold 7 and the solidified shell of the billet 8, and the pulling force of the billet 8 by the pulling device 10 is as follows. Although it constantly fluctuates due to changes in the drawing speed or intermittent drawing operations as shown in FIG. 3, this tensile force acting in the axial direction of the billet 8 is compensated as an internal stress in the drawing direction of the cart 33.
This does not affect the sliding gate 5 or the bonding surface 68 at all. Therefore, the driving force of the connecting cylinder 37 of this truck 33 presses the connecting pipe 6 against the sliding gate 5 side with a constant force, and the operation of the sliding gate 5 is achieved stably. Leakage of the molten steel 3 near the sliding gate 5 is completely prevented.

In addition, in a horizontal continuous casting machine having multiple strands as shown in Fig. 2, when a breakout occurs in one of the multiple strands,
When it becomes necessary to replace the break ring, the present invention provides a sliding gate 5 on the upstream side of the mold for each strand, making it possible to stop only that strand, reducing continuous operation time. Can be extended.

As another embodiment of the present invention, the track 34 may be extended to the downstream side of the mold or branched to allow the carriage 33
The mold and pinch rollers may be made movable, and the mold and pinch rollers may be replaced with new ones, or the entire trolley may be replaced with a new one, thereby extending the continuous operation time or shortening the replacement time.

FIG. 6 is a sectional view showing the overall structure of another embodiment of the present invention. This embodiment is similar to the previous embodiment and corresponding parts are provided with the same reference numerals. In this embodiment, a pedestal 12 for fixing the tundish 2 is mounted on a truck 70. This trolley 7
0 has wheels 71 and 72 and extends in a horizontal plane substantially perpendicular to the track 34 that guides the truck 33.
3,74 can be moved. In this way, the tundish 2 can be replaced.

FIG. 7 is a cross-sectional view showing the overall structure of still another embodiment of the present invention, and corresponding parts of the embodiment described above are given the same reference numerals. What should be noted in this embodiment is that a rotating shaft 75 having a vertical axis is provided on the trolley 33 in an upright manner. The swivel base 76 is supported on the rotating shaft 75 by a radial bearing 77.

FIG. 8 is a sectional view taken along the section line - in FIG. 7. Sliding pieces 78 and 79 are fixed to the swivel base 76. The sliding contact pieces 78 and 79 are supported on pedestals 80 and 81 that project and are fixed on the carriage 33. In this way, the swivel base 76
It is possible to freely angularly displace it around the axis 92 of 5.

A support plate 82 is erected on the truck 33 and extends in the front and rear directions of the truck 33 (in the left-right direction in FIG. 7, in the direction perpendicular to the plane of the paper in FIG. 8). On the swivel base 76,
Support plates 83 and 84 extending downward are fixed on both left and right sides of the support plate 82. These support plates 82
Springs 85 and 86 are interposed between and 83 and between support plates 82 and 84. support plate 82,
83, 84 and the springs 85, 86 are arranged in a vertical plane 8 passing through the axes of the mold 7 and mold tube 18 and the axis 92 of the rotating shaft 75.
7 is symmetrically constructed.

FIG. 9 is an enlarged horizontal sectional view of the vicinity of the sliding gate 5 in the embodiment shown in FIGS. 7 and 8. FIG. The radius R of the joining surface 88 of the connecting pipe 6 facing the sliding gate 5 side is equal to the radius R of the outer peripheral surface of the virtual cylinder whose center is on the axis of the connecting pipe 6 and the mold 7 which are closer to the sliding gate 5 than the axis 92. It is formed into an arcuate surface that forms a section. Connecting pipe 6 that constitutes the sliding gate 5
The joint surface 89 of the side sliding contact plate 15 facing the connecting pipe 6 is also formed to have the same radius and be concave so as to fit snugly with the joint surface 88 . Joint surface 88, 8
When the springs 9 are apart, the pair of springs 85 and 86
The shape, dimensions, etc. of the pair of springs 85 and 86 are configured so that the axis of the connecting pipe 6 and the axis of the sliding gate 5 are substantially aligned.

When the trolley 33 is connected and fixed by the action of the connecting cylinder 37 and the fixing cylinder 40,
As the carriage 33 moves toward the tundish 2, the joint surfaces 88 and 89 come into contact with each other, and the passage 91 of the sliding contact plate 15 and the passage 90 of the connecting pipe 6 are aligned. If the paths 91 and 90 are slightly misaligned, the swivel base 76 will be slightly angularly displaced around the axis 92 of the rotating shaft 75. In this way, even if the axial center of the sliding gate 5 and the pull-out direction 11 of the truck are arranged to be slightly deviated from each other, they can be easily connected and connected.

FIG. 10 is a sectional view showing the overall structure of another embodiment of the present invention, and this embodiment is similar to the first embodiment described above.
It is similar to the embodiment described in connection with FIGS. 5 to 5, and corresponding parts bear the same reference numerals. In this embodiment, the cutting machine 120 following the drawing device 10 includes:
It has fixed teeth 121 and movable teeth 122 that move up and down, and is attached to a base 123. moving teeth 1
22 is driven up and down by a double-acting cylinder 124. The base 123 has rollers 125 and 126.
is provided and is movable along a track 127 fixed on the trolley 33. Base 12
3 and the trolley 33 is a traveling cylinder 128.
is provided. This traveling cylinder 128 is pivotally supported on the truck 33 by a pin 129, and its piston rod 130 is connected to the base 123 by a pin 131. Fixed teeth 12 of cutting machine 120
1 and the movable teeth 122, when cutting the billet 8, the traveling cylinder 128 drives the base 123 to travel parallel to the drawing direction 11 of the billet 8 at the same speed as the billet 8. In this way, the billet 8 can be cut smoothly.
The billet 8 is a roller 13 provided on a trolley 33.
Supported by 2.

FIG. 11 is a sectional view showing the overall structure of another embodiment of the present invention. This embodiment is similar to the embodiment shown in FIGS. 1-5, and corresponding parts are provided with the same reference numerals. In this embodiment, the connecting pipe 6
Not only is a sliding gate 5 interposed between the
Another sliding gate 140 is interposed between the mold 7 and the mold 7. When replacing the truck 33, it is preferable to close the sliding gate 5 and release the connection of the connecting rod 38 by the fixing cylinder 40, as in the previous embodiment. When replacing the tundish 2, the two sliding gates 5, 140 are closed. Therefore, the connection is released by the fixing cylinder 40 and the connecting cylinder 37, and the tundish 2 is replaced with a new tundish 2. Subsequently, the new tundish and the mold side are connected in the opposite manner to the method used at the time of release, the sliding gates 5 and 140 are opened, and the new molten steel from the ladle 1 is connected to the previous molten steel in the connecting pipe 6 or the mold 7. Continuous casting can then be carried out. Further, according to such an embodiment, when the refractory of the tundish 2 or the tundish nozzle 4 becomes damaged, the tundish 2 can be quickly replaced, so that the continuous casting operation is not interrupted for a long time. You will no longer be exposed to it.

The sliding gate 5 includes a sliding plate 13 and sliding contact plates 1 on both sides of the sliding plate 13, as in the previous embodiment.
4, 15 and a driving cylinder 16, and a spring 6.
6 and 67. Another sliding gate 140 includes a sliding plate 142,
It includes sliding contact plates 143 and 144 on both sides thereof, and a cylinder 145 that drives the slide plate 142 up and down in a vertical plane. The connecting pipe 6 is attached to the sliding contact plate 144.
is fixed. The sliding contact plate 144 has springs 146,1
47, it is pressed against the slide plate 142 side.
The configuration associated with such springs 146, 147 is similar to the configuration associated with springs 66, 67.
Connecting rod 3 driven by driving cylinder 37
8 is connected to the frame 12 by the fixing cylinder 40, the connecting cylinder 37 presses the connecting pipe 6 against the sliding plate 15 side of the sliding gate 5. Therefore, the slide plate 13
The sum of the force acting on the connecting cylinder 37 and the force acting on the springs 66, 67 is applied to both surfaces and the sliding plates 14, 15. Similarly, both surfaces of the slide plate 142 and the sliding plate 143,
144 is given the sum of the force acting by the coupling cylinder 37 and the force acting by the springs 146, 147. On the other hand, the sliding contact plate 15 and the connecting pipe 6
A force from the connecting cylinder 37 acts on the joint surface with the connecting cylinder 37.

The invention can be implemented for continuous casting of molten steel as well as other metals.

As described in connection with FIGS. 7 to 9, the configuration for aligning the connecting pipe 6 and the sliding gate 5 is similar to the embodiments shown in FIGS. 6, 10, and 11. It can be implemented as described above.

As described above, according to the present invention, a trolley is provided to move forward and backward in the slab drawing direction, a mold and a pinch roll are fixedly loaded on the trolley, a sliding gate is provided between the tundish and the mold, and the sliding gate and Equipped with a connecting mechanism that presses the joint surface with the connecting pipe, the connecting mechanism allows the pressure contact force of the sliding gate and the pressure contact force between the sliding gate and the connecting pipe to be adjusted to the drawing speed of the slab and the intermittent drawing. It can be maintained at an appropriate constant value without being affected by operation or the like. As a result, the sliding gate operates smoothly, preventing the sliding gate from being crushed.
Excessive wear is prevented, and liquid metal does not leak between the sliding gate and the connecting pipe, making it possible to install the sliding gate in conjunction with horizontal continuous casting equipment. Become. The provision of this sliding gate makes it possible to easily replace and repair the mold, pinch roller, and other components on the carriage. In addition, since a fluid pressure cylinder is used as the connection mechanism that presses the joint surfaces of the sliding gate and the connecting pipe, it is easy to adjust the pressure force between the sliding gate and the connecting pipe, preventing leakage of molten metal, and preventing excessive pressure. This prevents damage to the sliding gate due to excessive pressure.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the overall structure of an embodiment of the present invention, FIG. 2 is a plan view of the embodiment shown in FIG. 1, and FIG. Graph showing the passage of time, Figure 4 is a vertical cross-sectional view of the vicinity of the sliding gate 5, Figure 5 is a horizontal cross-sectional view of the vicinity of the sliding gate 5, and Figure 6 is a horizontal cross-sectional view of the vicinity of the sliding gate 5.
The figure is a cross-sectional view showing the overall structure of another embodiment of the present invention, FIG. 7 is a cross-sectional view showing the overall structure of still another embodiment of the present invention, and FIG. 8 is a cross-sectional view taken along the section line of FIG. 9 is a cross-sectional view as seen from -
A horizontal sectional view showing the vicinity of the sliding gate 5 of the embodiment shown in the figure, and FIGS. 10 and 11 are sectional views showing the overall structure of still other embodiments of the present invention. 2... Tandaitsuyu, 3... Molten steel, 5,14
0...Sliding gate, 6...Connecting pipe, 7
... Mold, 8 ... Billet, 9 ... Secondary cooling device, 10 ... Pulling device, 23 to 26 ... Pinch roller, 33 ... Dolly, 37 ... Connection cylinder, 40 ... Fixing cylinder, 66, 67, 14
6,147...Spring, 76...Swivel base.

Claims (1)

[Claims] 1. A truck is arranged so as to be able to move forward and backward on a track laid parallel to the slab drawing direction, and a mold and a pinch roll are fixedly loaded on the truck, and a sliding gate is provided between the tundish and the mold, and this sliding gate Equipped with a connecting mechanism that presses the joint surfaces of the mold and the connecting pipe placed on the tundish side of the mold, and this connecting mechanism is a fluid pressure cylinder whose both ends are connected to the trolley and the tundish to generate a tensile force. Horizontal continuous casting equipment featuring: