JPS6131950B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention provides the following advantages in direct rolling of continuously cast slabs:
This invention relates to an induction heating device for locally heating the side edges of a slab whose temperature has dropped because the flask is water-cooled during continuous casting.

It has long been known that direct rolling of continuously cast slabs eliminates the need to cool them before placing them in a heating furnace, which is the conventional method, and saves energy. Because of water cooling, the temperature at the corner or side end of the slab dropped too much, making it difficult to roll it.

In induction heating, the gap between the heated object and the coil theoretically affects the heating efficiency exponentially, so it is desirable to heat the object while maintaining the gap as small as possible. However, when the slab moves on the roller table, it may move in a meandering or oblique manner, or may be subject to large warpage in plane, and may also move at a considerably high speed. On the other hand, by keeping the planned gap as small as possible without damaging the coil installed in a fixed position, and keeping the planned gap constant, the temperature can be raised as planned with good and constant heating efficiency. In order to do this, it is necessary to make the coil follow the displacement of the slab.

This invention was made in view of the above, and an induction heating coil is provided in each of a plurality of arms that can approach the object to be heated, and by pressing a rotatable roller through the arm, the induction heating coil is heated. To provide an induction heating device that can maintain a constant gap between the object and the object to be heated.

The figures will be explained below. 1 and 2, 1 is a hot slab, 2 is a specified amount g facing the upper surface of the side end of the object to be heated 1 such as a hot slab.
A planar first induction heating coil 3 is arranged to ensure a gap (space) between the first induction heating coil 2 and the first induction heating coil 2, respectively. with the first roller
In order to ensure the gap between the induction heating coil 2 and the object to be heated 1 at a constant value g, it contacts the upper surface of the object to be heated 1 and rolls as the object to be heated 1 advances. A hollow first arm 4 is used to fix the first roller 3 and the first induction heating coil 2 in a predetermined position, and is pivotally connected to a support column 5, which will be described later, by a shaft 4a. 5 is a support column consisting of a pair of left and right, the lower end of which is the object to be heated 1
It is fixed to the upper surface of a truck 6 which can be moved in a direction perpendicular to the side surface of the truck. 7 is a support column 5 and a first arm 4 in order to move the rear end of the first arm 4 up and down.
A first pressing device consisting of a cylinder device whose both ends are rotatably attached to the upper surface of the rear end presses the first roller 3 against the object to be heated 1 via the first arm 4 . 8 is an electric conductor for the first induction heating coil 2, and is provided within the first arm 4. Reference numeral 9 denotes a cooling water pipe for cooling the first induction heating coil 2, and is provided within the first arm 4. Reference numeral 10 denotes a second planar induction heating coil that faces the side surface of the object to be heated 1 and is arranged so as to secure a gap (space) of a specified amount g'; The second induction heating coil 10 and the second induction heating coil 10 are arranged so as to sandwich the second induction heating coil 10 between the two sides, and roll as the object 1 advances while contacting the side surface of the object 1 to be heated. A second roller 12 is used to secure a gap between the side surface of the heated object 1 and the side surface of the heated object 1 at a constant value g', and 12 is a hollow shape used to fix the second roller 11 and the second induction heating coil 10 in a predetermined position. The second arm 13 is a guide roller for transmitting the load of the second arm 12 to the support column 5 and reducing the frictional resistance of the horizontal movement of the second arm 12.
Two on each side are arranged in the gap between the left and right sides of the second arm 12 and the support column 5. The guide roller 13 is rotatably fixed to the support column 5. Reference numeral 14 denotes a horizontal groove provided on the side surface of the portion of the second arm 12 that fits into the support column 5, and which fits into the guide roller 13. 15 is the second arm 12
A second pressing device consisting of a cylinder device whose both ends are rotatably attached to the rear part of the device and the support column 5 presses the second roller 11 against the side surface of the object to be heated 1 via the second arm 12. It is for. 16
is an electrical conductor for the second induction heating coil 10 and is provided in the second arm 12 . 17 is the second
A cooling water pipe for the induction heating coil 10, which is provided in the second arm 12. 18 is a third induction heating coil; 19 is a hollow third arm having the third induction heating coil 18 fixed to its tip;
The tip, which is pivotally connected to the support column 5 at 9a, can swing up and down. Reference numeral 20 denotes a third pressing device consisting of a cylinder device whose both ends are rotatably fixed to the lower end of the third arm 19 and the trolley 6, and when the cylinder is fully extended, the upper surface of the third induction heating coil 18 is arranged to face the lower surface of the object to be heated 1 with a gap of a specified amount g". 21 is an electric conductor for the third induction heating coil 18, and is provided in the third arm arm 19. 22 is a cooling water pipe for the third induction heating coil 18, and the third arm 19
It is located inside. 23 is a wheel fixed to the trolley 6 and its drive mechanism, and 24 is a rail.

The operation of the device constructed in this way will be described next.

In the preparation state, the trolley 6 moves on the rails 24 by wheels and a drive device 23, and waits at a reference position away from the object to be heated 1 and a table roller (not shown) for feeding the object. In this state, the first pressing device 7 is extended and the first arm 4
swings about the shaft 4a, and the first induction heating coil 2 is lifted upward. or,
The second arm 12 is located at the most extended position of the second pressing device 15, that is, the second arm 12 is located at the support column 5.
It is in a position pulled to the side. The third induction heating coil 8 is in a state of being moved downward by swinging the third arm 19 about the shaft 19a by the third pressing device 20. Next, in response to a movement distance command based on the width of the object to be heated 1 from a control section (not shown), the cart 6 moves on the rail 24 toward the table roller (not shown), that is, toward the object to be heated 1, and moves to the second object. The tip of the roller 11 is stopped at a position where the tip is separated from the side surface of the object to be heated 1 by half the distance of the stroke of the second pressing device 15.
At this time, of course, the first and third induction heating coils 2 and 18 are set so that when facing the object to be heated 1, they are at the specified position from the side surface (end surface) of the object to be heated 1 according to the designed value. Arm 4, third arm 1
Needless to say, the assembly dimensions of 9 were selected. Next, each pressing device 7, 1 receives a signal that the heated object 1 has reached the position of the upper roller of the first and second rollers 3, 11 in the direction of movement of the heated object 1.
5 and 20 respectively operate, and each coil 2, 10,
18 face the object to be heated 1 with gaps of g, g', and g'' from the top, side, and bottom surfaces of the object to be heated, respectively.At this time, the third pressing device 20 is extended until it hits the mechanical stop. If this is done, the third coil 18 becomes horizontal and can face the lower surface of the object to be heated 1 with a gap of g''. First and second pressing devices 7, 1
When the first and second rollers 3 and 11 come into contact with the object to be heated 1, their operation is stopped, and the air pressure set by the pressure reducing valve continues to operate the first and second rollers.
The rollers 3 and 11 continue to press against the object to be heated 1. Similarly, power supply to each of the coils 2, 10, and 18 is started from a power supply section (not shown), and the side edges of the object to be heated 1 are continuously and locally heated. In this state, the first and second rollers 3, 11 and the first and second pressing devices 7, 1
5, it is possible to heat the coils while following the meandering, curving, or warping of the object to be heated without direct collision between each coil and the object to be heated 1. That is, when the tip of the first arm 4 receives an upward force through the first roller 3 due to the upward warping of the object to be heated, the first pressing device 7 and the piston rod are pulled out. The volume inside the pressing side cylinder chamber becomes smaller and the air pressure increases, but while exhausting air from the pressure reducing valve in the unreasonable circuit, the air pressure is kept constant and the contact pressure between the first roller 3 and the heated object 1 is kept almost constant. keep. If the thickness of the object to be heated 1 decreases or it warps downward (although this is generally unlikely due to the presence of table rollers), on the contrary, the volume inside the cylinder chamber on the pressing side increases, resulting in a decrease in air pressure and decompression. Air is supplied from the valve to maintain a constant air pressure and press the first roller 3 against the object to be heated 1. In this way, the first coil 2 is made to follow the vertical movement of the heated object 1 while ensuring the gap g, and also prevents the first coil 2 from coming into direct contact with the heated object 1 and being damaged. . The second arm 12 is connected to the second roller 11
When the object to be heated 1 is pushed toward the second roller 11 due to a meandering side surface, etc., it retreats by the guide roller 13 and the horizontal groove 14, and the pressing side cylinder chamber of the second pressing device 15 is pushed back. Although the volume decreases and the air pressure increases, the air is evacuated by a pressure reducing valve in a circuit (not shown) to maintain a constant air pressure and continue pressing. Even when the object to be heated 1 moves away due to meandering, air can be supplied from the pressure reducing valve to follow the increase in volume of the pressing side cylinder chamber and continue pressing at a constant air pressure. In this embodiment, a roller is not attached to the third coil 18, but this is because there is a space restriction as it must be attached in the gap between the rolls of the table roller, and because the table roller is attached to the lower surface of the object to be heated 1. cannot move below that,
This is done in consideration of the fact that it is certain that the third coil 18 and the object to be heated 1 do not come into direct contact with each other, and that there is no need to align them as long as the deterioration of heating efficiency due to the increase in the gap g'' is tolerated. However, if space constraints permit, it goes without saying that a roller may be installed in the same way as the first coil 2. Once the object to be heated 1 has passed, the first pressing device 7
The air pressure is changed to cause the piston rod to protrude from the cylinder, and the first arm 4 is swung about the shaft 4a to lift the tip upward and separate the first coil 2 from the object to be heated 1. Similarly, the second coil 10 is also horizontally moved so that the second arm 12 can be retracted by the second extrusion device 15, and is separated from the object to be heated 1. The third coil 18 may be left as it is, or may be lowered downward by the third pressing device 20. In addition,
Since scale is deposited on the third coil 18, sometimes the eighth pressing device 20 is activated to remove the third coil 18.
The scale is removed by lowering the third coil 18 and blowing compressed air onto the oblique upper surface of the third coil 18. When the width of the object to be heated 1 changes, the cart 6 is moved in response to a signal from the control section and heating begins in the same order as described above.

This embodiment cannot cope with the problem if the object to be heated 1 has two or more types of plate thickness. Therefore, another embodiment shown in FIGS. 3 and 4 was devised. That is,
In the figure, 1 to 4, 6 to 25, 4a, and 19a are the same as the conventional one. Reference numeral 25 denotes support columns, and grooves 26 are vertically machined inside the left and right columns. The lower part is also fixed to the trolley 6. A first bearing plate 27 has a convex portion that fits into the groove 26. A second bearing plate 28 has a convex portion that fits into the groove 26, and the guide roller 13 is rotatably mounted thereon. A third bearing plate 29 has a convex portion that fits into the groove 26. A flat liner 30 has a convex portion that fits into the groove 26, and is installed between the left and right support columns 5 on the truck 6 and above and below each of the bearing plates 27 to 29. Numeral 31 is a known jack block consisting of three tapered pieces, a screw rod, a nut, etc., which can adjust the vertical height. This jack block 31 consists of the carriage 6 and the third bearing plate 29, and the third bearing plate 29 and the second bearing plate 2.
8. The flat liner 30 is inserted between the second bearing plate 28 and the first bearing plate 27, respectively. Reference numeral 32 denotes a fastening plate, which is bolted and fixed to the upper end of the support column 5. 33 is an adjustment bolt, which is screwed into the fastening plate 32;
The first bearing plate 27 is pressed from above. With this structure, each part can be assembled like building blocks by simply inserting each part into the groove 26 of the support column 5 from above, and the height of the jack block 31 can be increased or decreased using the screw rod of the jack block 31. Furthermore, the mutual heights of the third arm 19, the second arm 12, and the first arm 4 can be changed very easily by changing the thickness of the flat liner 30, if necessary. Therefore, even when the heated object 1 has two or more thicknesses, it can be easily reset and used.

Although not shown, in another embodiment, a helical spring and a cylinder device are used instead of the first and second pressing devices 7, 15 each consisting of a cylinder device, and the pressing of the roller against the object to be heated is performed by the spring. The cylinder device may be operated using the reaction force only when it is necessary to separate the coil from the object to be heated. Alternatively, the air pressure of the cylinder device may be used to press the roller against the object to be heated, and the spring force may be used to separate the roller. In this case, the cylinder becomes larger because the air pressure far exceeds the reaction force of the spring, but the advantage is that the coil can be safely and reliably separated from the heated object in the event of a power outage when air pressure cannot be secured. There is.

In either case, the roller is pressed against the object to be heated with a certain pressure, and if the roller is pushed from the object to be heated, the cylinder device applying the pressing force or the combination of the cylinder device and the spring will be removed. The pressing force can be maintained while being elastically displaced. Further, when the object to be heated moves to escape from the roller, the cylinder device and the composite body with the spring can press the roller and press the object to be heated. In other words, it can be followed. Such variations in the shape and position of the object to be heated are obtained as a trajectory of the surface of the object to be heated at a fixed point when the object is being fed on table rollers, but conversely, when the object is stationary, It should be noted that the apparatus of the above-described embodiments also works effectively when a device having coils and rollers moves over a slab that is being heated.

In addition, although the embodiment regarding end heating has been described, the idea of this device is not limited to the end of the slab, but when the object to be heated and the coil move relative to each other with a constant gap, Regardless of the shape of the object to be heated or the shape of the coil, a roller that secures a gap between the coil and the coil is fixed so as not to be displaced relative to the coil, and this roller and coil are integrated and attached to the object to be heated using a cylinder device or a spring. As having a structure that can be pressed so that it can be elastically displaced,
It can be applied to induction heating devices for steel plates, pipes, long steel, shaped steel, etc.

Further, even if the guide rollers in the embodiments are replaced with sliding bearings within a range where the frictional force does not become excessive, there will be no fundamental effect on the operation of the device. Moreover, even if the coil is a single coil or two coils, the effects of the present invention can be exhibited and are useful as long as rollers are used.

According to this invention, the following effects can be expected.

(1) When continuous cast slabs are directly rolled, a combustion furnace is required because the temperature at the side ends is too low if the continuous cast slab is directly rolled.
It requires 100000Kcal/ton. In contrast, according to the present invention, local heating is possible, so approximately
40000Kcal/ton, which is a great energy saving effect.

(2) The gap between the coil and the heated object can be kept constant by following shape changes such as meandering and curving of the heated object, so heating efficiency is high and the specified power can be applied as planned, ensuring accurate temperature. Management is possible. Furthermore, since the gap between the coil and the object to be heated is not large, electrical efficiency is improved.

(3) The coil will not be damaged by contact with the heated object.

(4) In the event of an abnormality, the coil can be quickly separated from the heated object, so damage to the coil can be prevented.

(5) In particular, the top surface of the third coil is tilted diagonally downward,
Since the gap between the heated object and the heated object can be widened,
This is convenient for the scale on the upper surface of the third coil to fall naturally and be removed by air pressure.

(6) As shown in Figures 3 and 4, by using the unique building block structure, the vertical movement of each coil can be adjusted steplessly and easily.

[Brief explanation of the drawing]

Fig. 1 is a front view of one embodiment according to the present invention, Fig. 2 is a plan view of Fig. 1, Fig. 3 is a front view of another embodiment, and Fig. 4 is a sectional view taken along line A-A in Fig. 3. It is. In the figure, 1 is an object to be heated, 2, 10, and 18 are induction coils, 3, 11 are rollers, 4, 12, and 19 are arms, 5 is a support column, and 7, 15, and 20 are pressing devices. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. A plurality of arms that are supported by support pillars established at a predetermined distance from the object to be moved and that can access the upper, lower, and side surfaces of the side ends of the object to be heated. , a plurality of rotatable rollers provided on each arm and in contact with the object to be heated, such that when each roller contacts the object to be heated, the distance between the rollers and the object to be heated becomes a predetermined value; An induction heating device comprising: an induction heating coil provided on the arm; and a pressing device that presses the roller against the object to be heated with a predetermined pressure via the arm. 2. The induction heating device according to claim 1, wherein the pressing device is composed of a cylinder device and a helical spring. 3. Claims 1 or 2, characterized in that the arm is composed of a bearing plate that is provided on a support column and is movable in the vertical direction, and a coil support that is pivotally connected to the bearing plate. The induction heating device described.