JP3581973B2 - Induction heating device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an upper core movable C- type inductor for induction heating of a continuously conveyed material to be heated, and more particularly, to an improved rotary shaft mechanism of the upper core.
[0002]
[Prior art]
Generally, in a steel rolling line or the like, a material to be heated is heated to a predetermined temperature in advance, continuously conveyed, and sequentially rolled by a plurality of rolling mills to form a thin plate. In this rolling process, there is a problem that heat is easily radiated at the end portion of the material to be heated, and the temperature of this portion gradually decreases as compared with the central portion. In this way, if the temperature decreases at the end side and the entire temperature is rolled while the temperature is not uniform, the quality is not constant, the hardness at the end side increases, the material to be heated is cracked, and the rollers of the rolling mill are abraded. Problems occur. For this reason, an induction heating device for locally heating both ends of the material to be heated by an inductor and then rolling is installed upstream of the rolling mill in the steel rolling line.
[0003]
In this conventional induction heating apparatus, a core is formed in a C shape, and a heating coil is wound around an upper core leg and a lower core leg which are vertically opposed to each other with an opening of the C-shaped core therebetween. A C-shaped inductor is used in which a material to be heated is passed through and the material to be heated is induction-heated.
[0004]
For example, as shown in FIG. 3, this C-shaped inductor separates a C-shaped combined iron core into an upper iron core 1 and a lower iron core 2, and the upper iron leg 4a and the lower iron leg 4b with the opening 3 interposed therebetween. The heating coils 8, 8 are wound, and a rotating shaft 9 is attached to the upper vertical core 5a of the separated portion of the upper core 1. The rotating shaft 9 is rotatably supported by a bearing 10, and a cylinder 11 is mounted on the upper core 1. It is connected and movably supported, and has a structure in which the lower iron core is fixed .
[0005]
When the both ends of the material to be heated 12 are locally heated by this induction heating device, the end of the material to be heated 12 is passed through the opening 3 of the C-shaped inductor, and the high frequency is supplied from the power source to the heating coils 8 and 8. A current is applied to generate a magnetic flux in the vertical direction. An eddy current is induced by interlinking this magnetic flux with the material to be heated 12 perpendicularly, and Joule heat is generated by the eddy current to heat the material to be heated 12. The smaller the distance between the openings 3, the smaller the leakage magnetic flux and the higher the heating efficiency. However, when the distance between the openings 3 is adjusted in accordance with a change in the thickness of the material to be heated 12 or warpage, the upper iron core 1 may be used. The upper core 1 is rotated in the direction of the arrow about the rotation shaft 9 by rotating the cylinder 11 connected to the upper and lower cores 4a and 4b between the upper iron leg 4a and the lower iron leg 4b around which the heating coils 8, 8 are wound. The interval between the openings 3 is adjusted.
[0006]
In addition, as shown in FIG. 4, the structure of the rotating part to which the rotating shaft 9 is attached is such that the upper iron core 1 and the lower iron core 2 sandwich a laminated iron core 13 in which silicon steel sheets are laminated from both sides by iron core pressing plates 14, 14. The rotating shafts 9, 9 are joined to the iron core holding plates 14, 14 on both sides of the upper iron core 1, and the rotating shaft 9 is mounted on a bearing 10 provided with a bearing 16 so as to be rotatably supported. ing.
[0007]
However, in the structure in which the rotating shaft 9 is attached to the core holding plates 14, 14 at the ends of the upper vertical core 5a, the laminated core 13 in this portion is insufficiently tightened, and the core is overheated. It is difficult to align the centers, and a special jig for aligning the axis is required, which causes a problem in that even when assembled, the axes are shifted, the life of the bearings on both sides is extremely reduced, and the rotation becomes impossible. .
[0008]
[Problems to be solved by the invention]
An object of the present invention is to provide an induction heating apparatus which eliminates the above-mentioned drawbacks, secures a tightening structure of a portion where a rotary shaft is mounted, prevents a shift of a shaft center, and improves assembly workability.
[0009]
[Means for Solving the Problems]
The induction heating device according to the present invention is characterized in that a core obtained by sandwiching a laminated core obtained by laminating silicon steel plates from both sides with an iron core holding plate is separated into an upper core and a lower iron core, and rotating shafts attached to both sides of the core holding plate of the upper core. the to support the upper core rotatably supported in bearings in the lower core fixed upper core movable C-shaped inductor, the rotating shafts attached to the core presser plate of the upper core, the laminated core It is characterized by being connected by a penetrating insulating shaft.
[0010]
In the induction heating device of the present invention, the insulating shaft is inserted into both rotating shafts attached to the iron core holding plate of the upper core, and both ends thereof are connected to the rotating shaft, whereby the insulating shaft is sandwiched between the iron core holding plates connected thereto. The shaft cores are aligned by tightening the laminated iron cores.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 3, the C-shaped combined iron core is separated into an upper iron core 1 and a lower iron core 2, and heating coils 8, 8 are wound around the upper iron leg 4a and the lower iron leg 4b with the opening 3 interposed therebetween. Turn. A rotating shaft 9 is attached to the separated upper vertical core 5a of the upper core 1, and the rotating shaft 9 is rotatably supported by a bearing 10, and a cylinder 11 is connected to the upper core 1 to be movably supported. At the same time, an upper core movable C-type inductor to which a lower core is fixed is formed .
[0012]
As shown in FIG. 1, the structure of the rotating part is such that the upper core 1 and the lower core 2 are combined by sandwiching a laminated core 13 formed by laminating silicon steel plates from both sides with core holding plates 14, 14. Bosses 18 each having a shaft insertion hole 17 are respectively joined to both sides of the iron core presser plates 14, 14 located below the upper vertical iron core 5a, which is a rotating portion of the upper iron core 1. Reference numeral 20 denotes an insulating shaft, which is formed of an insulating and high tensile strength material such as a laminated glass polyester rod, and has screw holes 21 at both ends thereof.
[0013]
The insulating shaft 20 is inserted into the shaft insertion holes 17, 17, and a screw 23 provided with a flange 22 is inserted from the shaft insertion hole 17 and screwed into the screw hole 21, thereby forming the flanges 22, 22. The laminated core 13 sandwiched between the core presser plates 14 connected to the rotating shafts 9 is brought into contact with the end surfaces of the rotating shafts 9 and 9 and is tightened. For this reason, since the left and right rotating shafts 9 and 9 have a structure connected by the insulating shaft 20, the axial centers coincide with each other, the assembly is easy, and the laminated iron core 13 can be securely fixed. In addition, since they are connected by the insulating shaft 20, a loop of induced current due to linkage of magnetic flux is not formed, and a decrease in heating efficiency can be prevented.
[0014]
FIG. 2 shows another embodiment of the present invention, in which an upper core 1 and a lower core 2 are separated to form a C-shaped inductor, and a rotating shaft 9 is provided at an end of an upper horizontal core 6a of the upper core 1. The upper part of the lower vertical iron core 5b close to the rotating shaft 9 is formed in a semicircular shape. Further, the core presser plates 14, 14 of the upper horizontal core 6a with the rotating shaft 9 mounted in the middle are extended horizontally, and a cylinder 11 provided in the longitudinal direction is connected to this end. The configuration of the rotating part is the same as that of FIG.
[0015]
In this structure, the weight of the upper core 1 is reduced, and the upper core 1 and the cylinder 11 are arranged on the left and right with the rotation shaft 9 as a center. The operation for avoiding collision with the heating material 12 is fast. In the above description, the case where the cylinder 11 is used has been described, but a structure using a motor jack may be used.
[0016]
【The invention's effect】
According to the induction heating apparatus according to the present invention as described above, the upper core movable C-shaped inductor, the laminated core that make up the upper core, the rotating shafts attached to the core presser plate for clamping from both sides, stacked By connecting with an insulating shaft that penetrates the iron core, the axial cores can be aligned, the assembly is easy, and the laminated iron core can be securely fixed.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a rotating part of an induction heating device according to an embodiment of the present invention.
FIG. 2 is a side view of an induction heating device according to another embodiment of the present invention.
FIG. 3 is a side view of the induction heating device.
FIG. 4 is a sectional view showing a rotating part of a conventional induction heating device.
[Description of marks Nos.]
DESCRIPTION OF SYMBOLS 1 Upper core 2 Lower core 3 Opening 4a Upper core leg 4b Lower core leg 6a Upper horizontal core 8 Heating coil 9 Rotation axis
10 Bearing
11 cylinder
12 Material to be heated
13 Laminated core
14 Iron holding plate
16 Bearing
17 Shaft insertion hole
18 Boss
20 Insulated shaft
21 Screw hole
22 Flange
23 screw

Claims (1)

An iron core, in which a laminated iron core laminated with silicon steel sheets is sandwiched by iron core holding plates from both sides, is separated into an upper iron core and a lower iron core . Rotating shafts mounted on both sides of the iron core holding plate of the upper iron core are supported by bearings to support the upper iron core. In the upper core movable C-type inductor to which the lower core is fixed and the lower core is fixed , both rotating shafts attached to the core holding plate of the upper core are connected by an insulating shaft penetrating through the laminated core. An induction heating device characterized by the following.

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