JP3788978B2 - Induction heating type equipment for hot rolling equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an induction heating type device for hot rolling equipment, and more particularly to an induction heating type device for hot rolling equipment comprising a transverse type induction heating type device.
[0002]
[Prior art]
In order to obtain a high-quality hot-rolled steel sheet or strip, the rough bar supplied to the finishing mill needs to have a predetermined temperature and temperature distribution. For this reason, in recent years, it has been proposed to provide an induction heating type apparatus between the rough rolling mill row and the finish rolling mill row (see, for example, Patent Document 1).
[0003]
FIG. 5 schematically shows a part of a hot rolling facility equipped with the induction heating type apparatus. The slab S heated in a heating furnace (not shown) is rolled into a rough bar B by a rough rolling machine row 1. The coarse bar B is heated by the induction heating type device 2 so as to have a predetermined temperature and temperature distribution. The tip of the coarse bar B is sheared and removed by the crop shear 3 so as not to cause a trouble of biting into the finishing mill. Next, the coarse bar B is finish-rolled to a steel plate or steel strip having a predetermined plate thickness and shape by the finish rolling mill row 4.
[0004]
Among the induction heating type devices, the transverse type induction heating type device is provided with an upper inductor and a lower inductor which are arranged at intervals in the vertical direction across the sheet passing line. FIG. 6 schematically shows a conventional induction heating apparatus. In the induction heating type device 90, an inductor holding frame 91 is provided on the carriage 12. The inductor holding frame 91 has a top frame 93 supported by a column 92. The upper inductor 40 is suspended from the top frame 93 so as to be lifted and lowered by an upper inductor lifting device 95 provided on the top frame 93. The lower inductor 96 is supported by a lower inductor lift device 96 provided on the chassis 12 via a lower inductor stand 97, and is lifted and lowered by the lower inductor lift device 96. The upper and lower inductors 40 and 45 are lifted and lowered by an upper inductor lifting device 95 and a lower inductor lifting device 96, respectively, for adjusting the gap between the coarse bars B.
[0005]
By the way, in the conventional induction heating type apparatus 90, the lower inductor lifting / lowering device 96 is disposed immediately below the lower inductor 45 as shown in FIG. For this reason, there are the following problems.
(1) Scale falling from the rough bar in the plate passes and accumulates on the surface of the lower inductor lifting device (jack, transmission device, etc.), causing failure of the lifting device. (2) The table roll support frame is lengthened. So, if the bar collides with the table roll, the impact will cause excessive deflection and stress on the table roll support frame. (3) The foundation work volume is large, the foundation work range will be greatly widened, There were problems such as the need for a period.
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 10-137807 (page 4, paragraph [0029])
[0007]
[Problems to be solved by the invention]
The present invention solves the above-described problems, and prevents scale build-up on the lower inductor lifting device, excessive distortion and stress of the table roll support frame due to bar collision, and can reduce the foundation work volume. An object is to provide an induction heating type apparatus for hot rolling equipment.
[0008]
[Means for Solving the Problems]
An induction heating type apparatus for a hot rolling facility according to the present invention includes a cart that is movable in a direction perpendicular to the rolling line, an inductor holding frame fixed to the cart, and an inductor holding frame that can be moved up and down. an inductor, on, on raising and lowering the lower inductor respectively, e Bei a lower inductor lifting device, a full width heating transverse type induction heating apparatus capable of material to be heated, on the, the lower inductor the inductor Both the upper and lower inductor lifting and lowering devices are suspended from the top frame of the holding frame so as to be lifted and lowered, respectively.
[0009]
In the induction heating type apparatus for hot rolling equipment according to the present invention, since the lower inductor lifting device is provided on the top frame of the inductor holding frame, the lower inductor lifting device is located above the sheet passing path. For this reason, scale does not deposit on the surface of the lower inductor lifting device. In addition, the height of the table roll support frame can be reduced. As a result, excessive strain and stress generated in the table roll support frame by collision of the bar with the table roll can be prevented. Furthermore, the foundation work volume can be reduced by reducing the foundation depth.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. 1 is a front view schematically showing the entire induction heating apparatus of the present invention, FIG. 2 is a front view of the main part of the induction heating apparatus including an inductor, FIG. 3 is a plan view of the main part, and FIG. It is a side view of the said principal part.
[0011]
The induction heating type apparatus 10 mainly includes a carriage 12, an inductor holding frame 20, an upper and lower inductors 40 and 45, and upper and lower inductor lifting devices 50 and 60.
[0012]
The carriage 12 has a rectangular carriage surface, and a drive motor 14 is provided near the rear end of the carriage. The carriage 12 travels in the longitudinal direction of the carriage on a rail 13 laid on a base 18 on the foundation 16. The rail 13 extends in a direction perpendicular to the rolling line and to a position beyond the rolling line. The carriage 12 moves from offline (a retreat position from the rolling line) to online (a position of the rolling line).
[0013]
The inductor holding frame 20 includes a first column 21 and a second column 31, and a first top frame 22 and a second top frame 32. The first support column 21 extends upward from the central portion in the width direction of the chassis surface, and a first top frame 22 having a shape in which four corners of a rectangle are cut out is fixed to an upper end. Hanging brackets 23 are attached to four locations on the top surface of the first top frame 22. The first top frame 22 and the upper inductor 40 can be lifted off-line by hanging a crane hook (none of which is shown) on the suspension fitting 23. Since the upper side of the lower inductor 45 is opened by lifting the upper inductor 40, the lower inductor 45 can be taken out.
[0014]
The second support column 31 extends upward from the four corners of the chassis surface. The second support column 31 has an L-shaped cross section, and four second top frames 32 having a substantially square shape are fixed to the upper end of each second support column 31. The second top frame 32 is located at a notched portion of the first top frame 22. Therefore, when the first top frame 22 is lifted, the first top frame 22 and the second top frame 32 do not interfere with each other.
[0015]
The upper inductor base 25 is composed of a U-shaped frame whose longitudinal section along the rolling line direction (perpendicular to the paper surface in FIG. 2) opens upward. The upper inductor base 25 is connected to an output shaft 26 of a screw jack 51 described later, and is suspended from the first top frame 22 so as to be lifted and lowered. Guide shafts 29 protrude downward from four locations on the lower surface of the first top frame 22. The guide shaft 29 is fitted into four shaft holes 27 provided at the top of the upper inductor base 25 to prevent the upper inductor 40 from being displaced and shaken.
[0016]
In the vicinity of the upper surface of the carriage 12, a rectangular inductor-shaped lower inductor base 35 is disposed. Connection blocks 36 are fixed to the four corners of the lower inductor base 35, respectively. The connection block 36 is pin-connected to the lower end of an output shaft 62 of a hydraulic jack 61 (described later) via an intermediate shaft 65. Guide shafts 38 projecting from four places on the upper surface of the carriage 12 are fitted in the shaft holes 37 of the connecting block 36 to prevent the lower inductor 45 from being displaced and shaken.
[0017]
The inductor includes an upper inductor 40 and a lower inductor 45. The upper and lower inductors 40 and 45 have a heating coil 47 and an iron core 48 (see FIG. 4) housed in box-shaped covers 41 and 46, respectively. The upper inductor 40 is mounted on the upper inductor table 25, and the lower inductor 45 is mounted on the lower inductor table 35, respectively.
[0018]
The inductor lifting device includes an upper inductor lifting device 50 and a lower inductor lifting device 60. The upper inductor lifting device 50 includes four screw jacks 51 attached to the first top frame 22. An upper inductor raising / lowering motor 52 is provided on the first top frame 22, and a transmission shaft 54 is connected to an output shaft 53 of the motor 52. The transmission shaft 54 is connected to the first distributor 55 and further connected to the second distributor 56 via an intermediate bearing 58. The output shaft 57 of each distributor 55, 56 is connected to the screw jack 51. An absolute encoder 59 is provided on the first top frame. The absolute encoder 59 is connected to the transmission shaft 54 and detects the absolute height position of the upper inductor 40.
[0019]
The lower inductor lifting / lowering device 60 includes four hydraulic jacks 61 attached to the upper end of the second top frame 32. The output shaft 62 of the hydraulic jack 61 extends downward, and the upper end portion of the intermediate shaft 65 is pin-connected to the lower end portion. A lower end portion of the intermediate shaft 65 is pin-connected to the connection block 36. A hydraulic oil pipe 63 is connected to the hydraulic jack 61. Under inductor lifting device 60 is not mounted, et al. Is on the upper end of the second top frame 32 Runode, roll support frame 75 is made in comparison, for example, about 650mm lower the conventional induction heating device, also compared to the underlying depth conventional example It becomes shallower by about 720 mm .
[0020]
A table roll 6 for conveying the rolled material is arranged along the rolling line. A roll support frame 75 is provided on the mount 18 before and after the inductor holding frame 20, and a table roll 6 is attached to the upper end of the frame. The roll support frame 75 is lowered as described above. As a result, the coarse bar B does not collide with the table roll 6 and excessive strain and stress are not generated in the roll support frame 75, and the roll support frame 75 is prevented from being damaged.
[0021]
In the induction heating type apparatus 10 configured as described above, the carriage 12 is advanced in advance before the start of rolling, and the upper and lower inductors 40 and 45 are positioned online. The gap between the upper and lower inductors 40 and 45 is set so that a predetermined gap is generated between the upper and lower inductors 40 and 45 and the coarse bar B during rolling. Also, if the tip of the rough bar is warped or warped, the tip of the rough bar will not hit the lower inductors 40 and 45 before entering the induction heating type device. The gap is adjusted in advance. The setting or adjustment of the gap between the upper and lower inductors 40 and 45 is performed by the upper and lower inductor lifting devices 50 and 60. When the rough bar tip passes between the upper and lower inductors 40 and 45, the gap is returned to the predetermined gap.
[0022]
At the time of rolling stop or maintenance, the carriage 12 is retracted, and the upper and lower inductors 40 and 45 are placed offline.
[0023]
【The invention's effect】
In the induction heating type apparatus for hot rolling equipment according to the present invention, since the lower inductor lifting device is provided on the top frame of the inductor holding frame, no scale is deposited on the surface of the lower inductor lifting device, and the lifting device is damaged. Can be prevented.
In addition, since the height of the table roll support frame is reduced, excessive strain and stress are not generated in the support frame due to the collision of the coarse bar with the table roll, and damage to the table roll support frame can be prevented.
Furthermore, since the foundation work depth becomes shallow, the foundation work volume is reduced by, for example, about 15%, the foundation work range is significantly narrowed, and the construction period is shortened by, for example, about 50%.
[Brief description of the drawings]
FIG. 1 is a front view schematically showing the entire induction heating apparatus of the present invention.
FIG. 2 is a front view of the main part of the induction heating apparatus including an inductor.
FIG. 3 is a plan view of the main part of the induction heating type apparatus.
FIG. 4 is a side view of the main part of the induction heating type apparatus.
FIG. 5 is a schematic view showing a part of a hot rolling facility equipped with an induction heating type apparatus.
FIG. 6 is a front view schematically showing the whole of a conventional induction heating type apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Coarse rolling mill row | line | column 2 Induction heating type apparatus 4 Finishing rolling mill row | line | column 6 Table roll 10 Induction heating type apparatus 12 Bogie 16 Foundation 18 Base 20 Inductor holding frame 21 1st support | pillar 22 1st top frame 25 Upper inductor mount 31 2nd support | pillar 32 Second top frame 35 Lower inductor base 36 Connecting block 40 Upper inductor 45 Lower inductor 47 Heating coil 50 Upper inductor lifting device 51 Screw jack 52 Motor 54 Transmission shaft 55, 56 Distributor 58 Intermediate bearing 60 Lower inductor lifting device 61 Hydraulic jack 65 Intermediate shaft 75 Roll support frame 90 Induction heating type device 91 Inductor holding frame 92 Post 93 Top frame 95 Upper inductor lifting device 96 Lower inductor lifting device S Slab B Coarse bar H Hot rolled steel plate

Claims (1)

A carriage movable in a direction perpendicular to the rolling line, an inductor holding frame fixed to the carriage, and held up and down by the inductor holding frame, and the lower inductor and the upper and lower inductors are raised and lowered respectively. Bei example the inductor lifting device, a transverse-type induction heating device capable of full width heating of the material to be heated, the upper, is lower inductor vertically movably suspended both respectively from the top frame of the inductor support frame An induction heating type apparatus for hot rolling equipment, wherein the upper and lower inductor lifting and lowering devices are respectively provided on the top frame.

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