JPS58168457A - Horizontal and continuous casting device - Google Patents

Abstract

PURPOSE:To dispose a sliding gate between a tundish and a mold by providing a connecting mechanism which presses and connects the joint surfaces of the sliding gate and a connection pipe disposed on the tundish side of the mold. CONSTITUTION:A connecting pipe 6 is brought into press contact with a sliding contact plate 15 side at the joint surface thereof to the extent of prohibiting the leakage of molten steel from the joint surface by the tensile force of a connecting bar 38 developed by a connecting cylinder 37 mounted to a carriage 33. The press contact force between the pipe 6 and the plate 15 is controlled by setting the driving force of the cylinder 37 properly. The pipe 6 is brought into press contact with the sliding gate 5 side under specified pressure whereby the operation of the sliding gate 5 is stabilized and the leakage of molten steel 3 near the gate 5 is thoroughly prevented.

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, and a large frictional force is generated between the inner wall of the mold and the solidified shell. Therefore, a large force is generated in the slab between the mold and the pinch roll due to the pull-out drive of the pinch roll. If a sliding gate is to be inserted between the tanditshu and the mold 7, it is necessary to maintain the contact pressure between both surfaces of the slide plate moving in the vertical plane within a certain range. Otherwise, when the contact pressure is too high, the movement of the slide plate may cause problems, the slide plate may be crushed, or excessive wear may occur; When K is too low, there is a risk of molten steel leaking.

In the optical technology, the tandish, the mold, and the extraction device are arranged in this order at fixed positions, and even if an attempt is made to insert a sliding gate between the tandish and the mold, one side of the sliding plate cannot be pressed with a constant force. However, it is impossible to maintain a constant contact pressure on both sides.

On the other hand, it is conceivable that the entire mold can be pushed toward the sliding gate by an inch, but since this mold is affected by the above-mentioned pulling force, it is impossible to keep the contact pressure constant.

Further, in general, horizontal continuous casting equipment performs so-called intermittent drawing, in which the pinch rolls pull out the slab in a direction away from the mold, and then temporarily push it 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 varnish sliding gate to be placed between the tundish and the mold.

Figure @1 is an overall assembly diagram of an embodiment of the present invention. Molten steel from ladle 1 is supplied to tundish 2VC.

The molten steel 3 in the tandish 2 is
The lower side of! I! The mold 7 is accessed from the tundish nozzle 4 provided at the tundish nozzle 4 through the sliding gate 5P and the connecting pipe 6t.

The slab cooled by the mold 7, for example, the billet 8
The n1 drawing bag 111 is cooled by the secondary cooling device 9.
0 in the drawing direction 11. The tandish 2F'i is attached to a fixed position by the frame 12. The sliding gate 5 is equipped with a slide plate 13 that moves up and down in a vertical plane, and both sleeves of the slide plate 13 (
lfiK contacting #C touch plate 14.15 and slide plate 1
3 and a drive cylinder 16 for driving the cylinder up and down. Connecting pipe 6
comes into contact with the surface of the sliding contact plate 15 on the side opposite to the slide plate 13.

It is fixed to the connecting pipe 6Fi mold 7. A plate ring 17 is provided near the boundary between the connecting pipe 6 and the mold 7. Mold tube 18fl of mold 7, inlet 1
It is cooled by cooling water supplied from 9 and discharged from outlet 20. The secondary cooling device includes a nozzle 21 that injects cooling water and the like, a support roller 22 that supports the billet 8, and the like. The drawing device 110rj includes pinch rollers 23 to 26 that contact the outer surface of the billet 8. roller 23
, 24 are supported by arms 27, 28, respectively, and a reduction cylinder 29, 30 pushes the billet 8 to the lower blade, and pinches the billet 8 with a pinch roller 25, 26. The pinch rollers 25 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 idea of the present invention, the connecting pipe 6 is fixed to the shield 7, the secondary cooling device 9, and the pinch rollers 23 to 26.
The extraction device 10 having the following is fixedly loaded on a trolley 33. This truck 33 is disposed on a track 34 parallel to the pulling direction 11 and laid with a horizontal VC so that it can move forward and backward in the left and right directions in FIG. This trolley 33Fi is provided with wheels 35 and 36 that move on a track 34. A connecting cylinder 37 is fixed to the truck 33, and this connecting cylinder 37
The connecting rod 38 is driven by. One end s of the connecting rod 38
In K, an engagement hole 39 is formed. A fixing cylinder 4G-63 is fixed to the frame 12, and an engagement rod 41t'j driven by this cylinder 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 flat [fI] diagram of the embodiment shown in FIG.

This horizontal continuous casting device has a plurality of strands (three in this example), and the subscripts a,
It has components indicated by b and c. In the following description, reference signs without subscripts are used to collectively refer to subscripts a, b, and a.

Referring to FIG. 3, in the extraction device 10, the time tINt2
, the motor 32 drives the pinch rollers 25 and 26 to pull the billet 8 in the drawing direction 11, and from time t2 to
It stops at time t3, the pinch rollers 25 and 26 are temporarily driven in the opposite direction to the pulling direction from time t3 to t4, and stops again from time t4 to t5. In this way, a so-called intermittent drawing operation is performed from time tl to t5. In the present invention, although an intermittent pulling operation as shown in FIG. 3 may be performed, the pulling device 1
G may always pull out the billet 8 only in the pulling direction 11.

1J! 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. The slide plate 13 is housed in a plate-like body 45 made of refractory material and a frame body 46 surrounding the plate-like body 45. The sliding contact plate 14 is fixed to a support body 49. This support 49V'i is fixed to the iron skin 48 of the tundish 2. Support body 49Fi, both sides 7y of slide plate 13 (
In upper F) of FIG. 5, the guide leg 5 extending toward the connecting pipe 6 side
o, has 51. The support member 52 has guide pieces 53.54 interposed between the frame 46 of the slide plate 13 and guide legs 50.51. This support member 52 supports the sliding contact plate 1
5 and the surface on the connecting pipe 6 side are recessed by a surrounding piece 55. Cutouts 56.57 are formed on both sides of the support member 52, and spring receivers 58.59 having spherical seats are seated in the cutouts 56.57. Notch 56.57
and a holding rod 60.6 into which the spring receivers 58 and 59 are loosely inserted.
One end of 1 is connected to support 491C by pins 62, 63.
Supported. At the other end of the holding rods 60, 61,
Spring receivers 64 and 65tIX are installed. Spring receiver 5
A spring 66 is interposed between 8.64 and 8.64.

Similarly, a spring 67 is interposed between the spring receivers 59 and 65. In this way, due to the spring force of springs 66 and 67,
The support member 52 and therefore the surrounding piece 55 are connected to the slide plate 13
Forced to the side. These springs 66, 67 are connected to the surrounding piece 55.
A plurality of contact pressures are provided around the slide plate 13 so that the contact pressure acting on the sliding surface of the slide plate 13 is uniform.

By the tensile force of the connecting rod 38 by the connecting cylinder 37 mounted on the truck 33, the connecting pipe 6 is pressed against the sliding contact plate 15 side at the joint surface 68 to such an extent that molten steel does not leak from the joint surface. By appropriately setting the ff1lJ force exerted by the connecting cylinder 37, the pressure force between the connecting pipe 6 and the sliding plate 15 can be adjusted. The pressure contact forces between the slide plate 13 and the sliding contact plates 14.15 are approximately equal, and these contact forces are the sum of the contact force with which the connecting pipe 6 is pressed against the sliding contact plate 15 and the spring force of the springs 66.67. It is. The value of this sum is determined so that the vertical movement of the slide plate 13 can be performed smoothly, and the value of the plate-shaped body 451 of the slide plate 13 is determined so that the slide plate 13 can move up and down smoothly. and 5f! J
The values are selected so that the contact plates 14 and 15 are not crushed or worn excessively, and molten steel does not leak from the sliding surfaces 11111 between the slide plate 13 and the sliding contact plates 14 and 15. To the connecting rod 38,
For example, a detector such as a strain gauge capable of sensing the force acting in the axial direction of the connecting rod is provided, and the supply pressure of the connecting cylinder 37 is controlled to press the sliding surface of the sliding gate 5 and the joint surface of the connecting tube 6. It is effective to keep the pressure constant.

According to this embodiment, the mold 7 and the pulling device 10 including the pinch rollers 23 to 26 are fixedly loaded on the trolley 33, and the mold tube ig of the mold 7 is
A large frictional force is generated between the inner wall of the billet 8 and the solidified shell of the billet 8.
Although the tensile force of the billet 8 constantly fluctuates due to changes in the drawing speed and intermittent drawing operations as shown in Figure 3, the tensile force acting in the axial direction of the billet 8 is
There is no cedar at all in the sliding gate 5 or the joint surface 68, which is compensated as an internal stress in the pulling direction. therefore,
The connecting pipe 6 is pressed against the sliding gate 5 side with a constant force by the support of the connecting cylinder 37 of the truck 33, and the operation of the sliding gate 5 is achieved stably, and the sliding gate 5 of the molten steel 3 Leakage in the immediate vicinity is completely prevented.

In addition, in a horizontal continuous casting machine with multiple strands as shown in Figure 2, when a breakout occurs in one of the multiple strands or when it is necessary to replace the plate ring, the main In the invention, since the sliding gate 5 is provided on the upstream side of the mold for each strand, it is possible to stop only that strand, and the continuous operation time can be extended.

As another embodiment of the present invention, the track 34 can be extended or branched downstream of the mold, so that the carriage 33 can be moved, so that the mold or pinch roller can be replaced with a new one, or the entire carriage can be replaced with a new one. It may be possible to extend the continuous operation time or shorten the time required for replacement.

FIG. 86 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 given the same reference numerals.
will be installed on. This truck 70 has wheels 71.72 and can move on a track 73.74 extending in a horizontal plane, approximately perpendicular to the track 34 guiding the truck 33. 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 the trolley 33.
A rotating shaft 75 having a vertical axis is provided upright. The rotating base 76Fi is supported by the rotating shaft 75 by a radial bearing 77.

FIG. 8 is a sectional view taken from the section line type -■ in FIG. 7. Sliding pieces 78 and 79 are fixed to the swivel base 76. The sliding contact pieces 78, 79 protrude and are fixed onto the carriage 33, and the receivers are supported on the bases 80, 81. In this way, the swivel base 76 can be freely angularly displaced around the axis 92 of the rotating shaft 75.

A support plate 82 is erected on the truck 33 and extends from the front and back of the truck 33 (in the left-right direction in FIG. 7, the amount of force perpendicular to the plane of the paper in FIG. 8). Supports i83 and 84 extending downward on both left and right sides of the support plate 82 are fixed to the swivel base 76. Between these support plates 82 and 83, and the support plate 82
Springs 85 and 86 are interposed between and 84. The configuration associated with the support plate 82.83.84 and the spring 85.86 is configured symmetrically with respect to a vertical plane 87 passing through the axes of the mold 7 and mold tube 18 and the axis 92 of the rotation shaft 75.

FIG. 9 is an enlarged horizontal sectional view of the vicinity of the sliding gate 5 in the embodiment shown in FIGS. 97 and 8. FIG. The radius 11j of the joint surface 88 of the connecting pipe 6 facing the sliding gate 5 side is a part of the upper outer surface of a 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. The joint surface 89 facing the connecting pipe 6 of the sliding contact plate 15 of the connecting pipe 6 configuring the sliding gate 5 is also
It is recessed and has the same radius to fit snugly with the joint surface 88 . In the state where the joint surfaces 88 and 89 are bent, the connecting pipe 6 is
The shape, dimensions, etc. of the pair of springs 85 and 86 are made so that the axis of the sliding gate 5 and the axis of the sliding gate 5 are substantially in a straight line.

The truck 33 has a connecting cylinder 37 and a fixing cylinder 40.
When the table 4L33 is connected and fixed by the action of the tandish 2, the joint surface 88.
contact, and the passage 91 of the sliding contact plate 15 and the passage 9 of the connecting pipe 6
Centering with 0 is achieved. If the centers of the passages 91 and 90 are slightly misaligned, the swivel base 76
slightly angularly displaced about the axis 92 of 5. 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 shifted from each other, they can be easily connected and connected.

FIG. 1θ is a sectional view showing the overall configuration of another embodiment of the present invention, FIG. 11 is an enlarged horizontal sectional view of the vicinity of the sliding gate 5, and FIG. 5 is a horizontal sectional view showing a connection structure with a sliding gate 5. FIG. Jin's embodiment is similar to the embodiment shown in FIGS. 7 to 9, and the swivel table 76 is elastically displaced by the spring force of the springs 85 and 86 relative to the axis 921 of the rotating shaft 75. is possible, and thereby the connection 011 of the connecting pipe 6
8g and the joint surface 89 of the sliding contact plate 15 of the sliding gate 5 fit perfectly, and the passages 90 and 91 are centered. The configuration shown in FIG. 11ff! , is similar to the configuration described above in connection with FIG. 5vc. These corresponding parts vc are given the same reference numerals. It should be noted that an arm 95.96 is fixed to the support member 52 on the side of the connecting pipe 6 and extends parallel to the axis of the connecting pipe 6; Pins 97°98 are erected parallel to each other and perpendicular to the axis m of the connecting pipe 6 when connected. At the bottom of the groove shown in FIG. is supported by Piston rod 10 of cylinder 100.101
4, 105 are formed with locking claws 106, 107. Piston rods 110, 111 of tilting cylinders 108, 109 are pinned to the side walls of cylinders 100, 101 by pins 112, 113. The tilting cylinders 108 and 109 are supported by the end wall 994C of the mold 7 by pins 114 and 115. Bin 102,
The axes of the pins 103, 112, 113, 114, and 115 are parallel, and when the connecting pipe 6 and the sliding gate 5 are joined, they are also parallel to the axes of the pins 97 and 98.

Note that in this embodiment, the connecting cylinder 37, the fixing cylinder 40, and their related structures are not provided7. When connecting the connecting pipe 6 and the sliding gate 5, the tilting cylinders 108 and 109 are reduced in size, and the tundish 2 side Vc8 is attached to the trolley 331 in this state.
move. In this way, the joint surface 88 of the connecting pipe 6 and the 41! of the sliding gate 5! The contact surface 89 of the contact plate 15 contacts and centering is performed.

In this state, the piston rods 104, 105'f of the driving cylinders 100, 101 remain extended, and the tilting cylinder 1
08, 109 are extended so that the pins 97, 98 and the locking claws 106, 107 can lock together. Therefore, the piston rod 104 of the driving cylinder 100° 101,
105 is driven finely. In this way, the joint surface 88 of the connecting pipe 6 and the joint surface 89 of the sliding contact plate 15 of the sliding gate 5 are pressed into contact by the driving force of the driving cylinders 100 and 101. At the sliding gate 5,
EEi between both surfaces of the slide plate 130 and the sliding contact plates 14 and 15
In addition, the pressure of the contact surfaces 88 and 89 is determined by the force of the cylinders 100 and 101 due to the spring force of the springs 66 and 67. In this way, the sliding gate 5 can be fabricated smoothly, and molten steel can be prevented from leaking between the sliding gate 5 and the connecting pipe 6. It is prevented by Ii.

FIG. 13 is a cross-sectional view of the entire trench bottom of a pond embodiment of the present invention, which is similar to the embodiment described in connection with FIGS. 1-5 above; Corresponding parts are given the same reference numerals. In this embodiment, a cutting machine 120 following the drawing device 10 has fixed teeth 121 and movable teeth 122 that move upward FK, and is mounted on a base 123.

The movable tooth 122 is moved to the upper F by a movable cylinder 124 at '4.
driven by Base 12. llt, o-1125,! 2
6 is provided and is movable along a track 127 fixed on the trolley 33. Base 123 and trolley 3
3, a traveling cylinder 12g is provided. This traveling cylinder 1281-j is pivotally supported on the truck 33 by the bin 129, and its piston rod 130f'i
, are connected to the base 123Vc by the bin 131. With the fixed teeth 121 and movable teeth 122 of the cutting machine 120,
When cutting the billet 8, the traveling cylinder 128 drives the base 123 to travel parallel to the drawing direction 11vc of the billet 8 at the same speed as the billet 8. In this way, the billet 8 can be cut smoothly.

Billet 8F'i, nine rollers 132 installed on truck 33
Supported by

FIG. 14 is a sectional view showing the overall configuration of an embodiment of the pond 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, not only a sliding gate 5 is interposed between the connecting pipe 6 and the tundish 2, but also another sliding gate 14G is interposed between the connecting pipe 6 and the mold 7. There is. 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 Tanditshu 2, two sliding gates 5,140
Close. Therefore, the fixing cylinder 40 and the connecting cylinder 37 are used to connect the cylinder 40 and the connecting cylinder 37. Release it, Tanditshu 2t
-Replace with a new Tanditsh 2. Next, the new tundish and the mold side are connected in the opposite manner to the method used for release, and the sliding gate 5,140 is opened.
The new molten steel from the ladle 1 is connected to the previous molten steel in the tank, connecting pipe 6 or mold 7, so that continuous casting can continue. In addition, according to this embodiment, when the refractory of the tundish 2 or the tundish nozzle 4 becomes damaged, the tundish 2 can be quickly replaced, so that continuous casting work can be done for a long time. There will be no interruptions over time.

The sliding gate 5 includes a sliding plate 13, sliding plates 14.15 on both sides thereof, and a driving cylinder 16, as in the previous embodiment, and is pressed against the sliding plate 13 by a spring 66.67. Another sliding gate 140 includes a sliding plate 142 and sliding contact plates 143 and 14 on both sides thereof.
4, and a cylinder 145 that drives the slide plate 142 up and down in a vertical plane. The TFI connecting pipe 6 is fixed to the sliding contact plate 144. The sliding contact plate 144 has springs 146, 14
7, it is pressed against the slide plate 142 side.

Konoyouna spring 146, 1471cil reaching structure 1ff
iU, similar to the configuration associated with spring 66.67. When the connecting rod 38 that is driven by the driving cylinder 37 is connected to the frame 12 by the fixing cylinder 40, the connecting pipe 6 is pressed against the sliding plate 15 side of the sliding gate 5 by the connecting cylinder 37. be done. Therefore, the force acting on both surfaces of the slide plate 13 and the sliding plates 14, 15 by the connecting cylinder 37 and the spring 66.6
The sum of the forces acting by 7 and 7 is given. Similarly,
Slide plate 142+7) Both surfaces and sliding contact plates 143, 144
The force barb 14 exerted by the coupling cylinder 37 on
The sum of the forces acting by 6.147 and 147 is given.

On the other hand, a force from the connecting cylinder 37 acts on the joint surface between the sliding contact plate 15 and the connecting pipe 6.

This embodiment also includes a fixing cylinder 40 and a connecting cylinder 37.
Instead, a connection structure such as that described in connection with FIGS. 11 and 12 can be employed.

The present invention can be implemented in VC for continuations of not only molten steel but also other metals.

As described in connection with FIGS. 7 to 9, the four-layer structure for centering the connecting pipe 6 and the sliding gate 5 is 18
The embodiments of FIGS. 6, 13 and 14 can be implemented as described above.

As described above, according to the present invention, a truck is provided that can move forward and backward in the slab drawing direction, a mold and a pinch roll are fixedly loaded on this truck, a sliding gate is provided between the tundish and the molding F, and the sliding gate and Equipped with a connecting mechanism that presses the joint surface with the connecting pipe,
Due to its connection mechanism, the pressure of the sliding gate,
Also, the pressure contact force between the sliding gate and the connecting pipe can be maintained at an appropriate constant value without being influenced by the slab drawing speed or intermittent drawing operation. As a result, the sliding gate operates smoothly, preventing the sliding gate from being crushed or excessively worn out, and prevents liquid metal from leaking between the sliding gate and the connecting pipe. can be provided in conjunction with horizontal continuous casting equipment. With this sliding gate equipment,
The mold, pinch roller, and other components on the truck can be easily replaced and repaired.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the overall configuration of an embodiment of the present invention;
2 is a plan view of the embodiment shown in FIG. 1; FIG. 3 is a graph showing the time course of the drawing speed of the billet 8 by the drawing device IO; 5 is a horizontal cross-sectional view of the vicinity of the sliding gate 5, FIG. 6 is a cross-sectional view showing the overall structure of another embodiment of the present invention, and FIG. 7 is a cross-sectional view showing the overall structure of still another embodiment of the present invention. A cross-sectional view, FIG. 8 is a cross-sectional view taken from the section line ``gate'' in FIG. 7, and FIG. 9 shows the vicinity of the sliding gate 5 of the embodiment shown in FIGS. 7 and 8. A horizontal sectional view, FIG. 10 is a sectional view showing the overall structure of another embodiment of the present invention, FIG. 11 is a horizontal sectional view of the vicinity of the sliding gate 5 shown in FIG. FIGS. 10 and 11 are horizontal cross-sectional views showing the connection vc-related structure between the connecting pipe 6 and the sliding gate 5 in the n7'C* embodiment, and FIGS. 13 and 14 are further views of the present invention. It is a #r side view which shows the whole structure of each Example. 2... Tanditshu, 3... Molten steel, 5,140.
...Sliding gate, 6...Connecting pipe, 7...
mold, 8... billet, 9... secondary cooling device,
DESCRIPTION OF SYMBOLS 10... Pulling device, 23-26... Pinch roller, 33... Dolly, 37... Connection cylinder, 40...
・・Fixing shilling, 66.67.146,147・・
・Spring, 76... Swivel stand agent Patent attorney Kei Nishi

Claims (1)

[Claims] A cart is installed parallel to the slab drawing direction and movable back and forth on nine tracks, and a mold and a pinch roll are fixedly loaded on the cart, and a sliding gate is provided between the tundish and the mold. A horizontal continuous casting device characterized by being equipped with a connecting machine group that presses the joint surface with a connecting pipe placed on the tanditsu side.