JPH0534697U - Induction heating device - Google Patents

Abstract

(57) [Abstract] [Purpose] The spacing between the upper and lower inductors of the C-shaped inductor, which has excellent heating efficiency due to the formation of loops through which magnetic flux passes, is made variable to prevent collision with the warped end of the heated material. In addition to preventing this, the gap between the material to be heated and the inductor is narrowed to improve the heating efficiency and reduce the equipment power supply capacity. [Structure] C-shaped inductor 18 in which an inductor in which a heating coil 2 is wound around a block iron core 7 is arranged so as to face upper and lower legs 8A and 8B sandwiching an opening 9 of a U-shaped iron core 8 is supported by a carrier 10 In the induction heating device attached to, at least the upper leg portion 8A is separated from the U-shaped iron core 8,
The separated legs 8A are vertically movably supported on a support stand 14 which is erected on a support trolley 10, and the upper and lower inductors 5 are supported.
The distance between A and 5B is adjusted.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a C-shaped inductor for inductively heating a belt-shaped material to be continuously conveyed, which is an improvement of the mechanism for adjusting the interval between the upper and lower inductors.

[0002]

[Prior Art]

 Generally, in a steel rolling line or the like, a strip-shaped material to be heated (sheet bar) is heated to a predetermined temperature in advance and then continuously run, and then heated in a rolling mill to form a thin plate. There is a problem that the temperature on the edge side of the material gradually drops. Thus, if the temperature decreases on the edge side and the temperature is not uniform throughout the rolling, the quality will not be constant and the hardness of the edge side will increase and the material to be heated will not crack and the rollers of the rolling mill will not wear. Since any problems occur, an induction heating device that heats the end of the material to be heated is installed upstream of the rolling mill in the steel rolling line.

This conventional induction heating device is roughly classified into an E-type inductor and a C-type inductor. As shown in FIG. 4, a conventional E-shaped inductor has a heating coil 2 wound around a groove of an E-shaped iron core 1, a heat-resistant plate 3 attached to the surface thereof, and upper and lower inductors 5A and 5B surrounded by a support frame 4. It has a structure in which it is supported by an up-and-down drive mechanism (not shown) and is arranged so as to oppose vertically on both ends of the belt-shaped material 6 to be conveyed.

This causes a magnetic flux to be generated between the upper inductor 5A and the lower inductor 5B, and causes the eddy current to be induced by interlinking this magnetic flux with the heated material 6, and this current and the resistance of the heated material itself It is designed to generate Joule heat and heat it. This E-shaped inductor has a higher heating efficiency as the gap between the E-shaped inductor and the heated material 6 is smaller. Therefore, the E-shaped inductor prevents collision with the heated material 6 and is set to about 20 to 30 mm in consideration of the heating efficiency.

As shown in FIG. 5, the C-shaped inductor includes a heating coil 2 wound around the outer periphery of a block iron core 7, a surface thereof covered with a heat-resistant plate 3, and an inductor 5 A, 5 B surrounded by a support frame 4 and a U-shaped iron core 8. It is attached to the upper and lower legs 8A and 8B across the opening 9 to form a C-shaped iron core, and both ends of the belt-shaped material 6 to be conveyed are passed through the opening 9 for induction heating. It was done.

The former E-type inductor has an advantage that the structure is compact and lightweight, but since the inductors 5A and 5B are separately arranged on the upper and lower sides and a large air gap exists in the magnetic flux passage, the heating efficiency is poor. The gap between it and the material to be heated is narrow. On the other hand, the C-shaped inductor has excellent heating efficiency because the loop through which the magnetic flux passes is formed inside the C-shaped iron core, and the heating efficiency is improved even if the material to be heated 6 and the inductors 5A and 5B are enlarged. There is an advantage that it does not drop so much.

Therefore, the C-shaped inductor has a large gap between the material to be heated 6 and the inductors 5A and 5B. Therefore, the C-shaped inductor is large in consideration of the warp occurring at the front and rear ends of the material to be heated 6 in the longitudinal direction. The upper and lower inductors 5A and 5B are fixed to the U-shaped iron core 8 with a gap.

However, during the rolling operation, the material 6 to be heated, which is warped more than usual, may be conveyed, and by any chance, the inductors 5A and 5B may have large warped front and rear ends. Upon collision, the material to be heated 6 is heavy and its impact is large, so there is a risk of damaging the inductors 5A and 5B. If the inductors 5A and 5B were damaged, there was a problem that the rolling line had to be stopped and repaired for a long period of time.

In addition, the heating efficiency of the C-shaped inductor does not decrease much even if the gap between the material to be heated 6 and the inductors 5A and 5B is large, but the smaller the gap is, the better the efficiency is. Therefore, a large gap is used to prevent collision. If too much, the magnetic flux leakage increases and the heating efficiency decreases due to an increase in copper loss, so there is also the problem that the equipment power supply capacity must be increased.

[0010]

[Problems to be solved by the device]

 The present invention eliminates the above-mentioned drawbacks and makes the interval between the upper and lower inductors of the C-shaped inductor variable so as to prevent the warped end of the heated material from colliding and to narrow the gap between the heated material and the inductor. The object of the present invention is to provide an induction heating device in which the heating efficiency is improved and the equipment power supply capacity is reduced.

[0011]

[Means for Solving the Problems]

 The present invention relates to an induction heating apparatus in which a C-shaped inductor, in which an inductor having a heating coil wound around a block iron core and opposed to upper and lower legs sandwiching an opening of a U-shaped iron core, is mounted on a supporting carriage. At least the upper leg part is separated from the U-shaped iron core, and the separated leg part is vertically movably supported on a support stand erected on a support carriage to adjust the interval between the upper and lower inductors. It is characterized by

[0012]

[Action]

 In the induction heating device of the present invention, the material to be heated conveyed through the rolling line passes between the upper and lower inductors of the C-shaped inductor. In the C-shaped inductor, the upper leg part of the U-shaped iron core is separated and supported vertically movable, and the inductor attached to the separated leg part is supported vertically movable along the support stand. .

Since the front end and the rear end side of the material to be heated are warped, they are detected by a warp amount detector provided on the rolling line and are supported so as to be vertically movable based on a signal corresponding to the warp amount. Raise and lower the upper inductor to avoid collision with the heated material. At this time, the inductor moves up and down while keeping the gap between the warped tip and the upper inductor narrow, so that this portion can be effectively heated.

[0014]

The present invention will be described in detail below with reference to FIGS. 1 to 3. In the figure, reference numeral 10 denotes a supporting carriage 10 which is moved on a rail 11 laid perpendicular to the direction in which the material 6 to be heated is conveyed by wheels 12 attached to the bottom of the supporting carriage 10. An L-shaped iron core 13 is attached to the tip end side of the support carriage 10, and a lower inductor 5B in which a heating coil 2 is wound around a block iron core 7 is attached to the tip end side upper surface of the lower leg portion 8B.

A support stand 14 is provided upright on the upper end of the support carriage 10 and a horizontal support arm 15 is connected to the upper end of the support stand 14. A guide rail 16 is vertically attached to a side surface of the support stand 14, and an L-shaped hanging portion 17 is vertically supported on the guide rail 16.

An upper leg portion 8 A is connected to the bottom surface of the L-shaped hanging portion 17 and moves up and down together with the hanging portion 17 along a guide rail 16, and the upper leg portion 8 A and the L-shaped iron core 13 A U-shaped iron core 8 having a separate structure is formed. Further, an upper inductor 5A is connected to the bottom surface of the upper leg portion 8A so as to face the lower inductor 5B, thereby forming a C-shaped inductor 18 as a whole.

Further, as shown in FIGS. 2 and 3, two C-shaped inductors 18 are arranged in parallel in the front-rear direction along the conveyance direction of the material 6 to be heated and are attached to the support carriage 10. The hanging parts 17, 17 of the front and rear C-shaped inductors 18, 18 are integrally connected by a connecting part 19. An upper portion of the connecting portion 19 is connected by a jack 20 attached to an upper portion of the support arm 15, and a motor 21 is connected to the jack 20. The motor 21 is connected to a warp amount detector (not shown) provided on the rolling line, and rotates according to the detected warpage amount of the heated material 6. The rotation of the motor 21 causes the jack 20 to move up and down, and the hanging portion. The upper inductors 5A and 5A attached to 17, 17 are designed to move up and down.

As shown in FIG. 1, sprockets 22 and 22 are provided on both sides of the horizontal support arm 15, and one end of the chain 23 guided by the sprockets is connected to an L-shaped hanging portion 17. The other end is connected to the counterweight 24 to reduce the load on the drive mechanism. In the figure, 25 is a roller for guiding the material 6 to be heated, 26 is a motor for traveling the supporting carriage 10, and 27 is a speed reducer connected to this motor 26.

In the induction heating device having the above-mentioned configuration installed on the rolling line, first, the motor 26 is rotated to rotate the wheels 12 via the speed reducer 27, and the supporting carriage 10 is moved on the rail 11. The position of the C-shaped inductor 18 is adjusted according to the plate width of the material 6 to be heated. In this state, the preheated material 6 is conveyed to the rolling line and passed through the C-shaped inductor 18 of the induction heating device installed on the upstream side of the rolling mill where the temperature of the end portion is lowered.

At this time, since the tip side of the material to be heated 6 is warped, this is detected by a warp amount detector (not shown) provided on the rolling line, and a signal corresponding to the warp amount is output to the motor 21. This signal causes the motor 21 to rotate, and the jack 20 connected thereto operates to pull up the hanging parts 17, 17 connected by the connecting part 19. As shown in FIG. 1, the suspension parts 17 and 17 are guided upward by a guide rail 16 and are connected to a counterweight 24 through a chain 23 to balance the left and right weights so that the suspension parts 17 and 17 can be smoothly lifted and suspended. The upper inductor 5A attached to the lower portion 17 rises to avoid the collision of the material 6 to be heated and, at the same time, keep a narrow gap with the warped tip portion to effectively heat this portion.

After the warped tip has passed, the signal from the warp amount detector causes the motor 21 to rotate in the opposite direction, so that the jack 20 connected thereto extends to lower the connecting portion 19 and the upper inductor 5A. Can be lowered to narrow the space between the lower inductor 5B and the lower inductor 5B and perform steady-state heating. The upper leg 8A supporting the upper inductor 5A moves up and down in a state of being superposed on the upper part of the L-shaped iron core 13, so that a C-shaped iron core is formed as a whole and a loop through which magnetic flux passes is formed. Therefore, it can be heated efficiently.

In the above embodiment, the structure in which only the upper inductor 5A is moved up and down is shown, but the structure in which the lower inductor 5B is also moved up and down may be adopted. Further, although the structure for driving the upper inductor 5A up and down is driven by the jack 20 and the motor 21, it may be driven by hydraulic pressure or pneumatic pressure.

[0023]

[Effect of the device]

 As described above, according to the present invention, a loop through which a magnetic flux passes is formed, and the interval between the upper and lower inductors of the C-shaped inductor, which is excellent in heating efficiency, is variable, and the end portion of the warped material is warped. It is possible to obtain an induction heating device in which the gap between the material to be heated and the inductor is narrowed, the heating efficiency is improved, and the equipment power supply capacity is reduced, while preventing the collision with

[Brief description of drawings]

FIG. 1 is a front view showing an induction heating apparatus according to an embodiment of the present invention.

FIG. 2 is a side view showing the induction heating device of FIG.

FIG. 3 is a plan view showing the induction heating device of FIG. 1.

FIG. 4 is a sectional view showing a conventional E-shaped inductor.

FIG. 5 is a perspective view showing a conventional C-shaped inductor.

[Explanation of sign]

 1 E-shaped iron core 2 Heating coil 5A Upper inductor 5B Lower inductor 6 Heated material 7 Block iron core 8 C-shaped iron core 8A Upper leg 8B Lower leg 9 Opening 10 Support cart 13 L-shaped core 14 Support stand 15 Support arm 16 Guide rail 17 Suspended part 18 C-shaped inductor 19 Connection part 20 Jack 21 Motor 23 Chain 24 Counterweight 25 Roller

Claims (1)

[Scope of utility model registration request] 1. An induction heating apparatus in which a C-shaped inductor, in which an inductor having a heating coil wound around a block iron core is arranged to face upper and lower legs sandwiching an opening of a U-shaped iron core, is mounted on a supporting carriage. , At least the upper leg portion is separated from the U-shaped iron core, and the separated leg portion is vertically movably supported on a support stand erected on a support carriage to adjust the interval between the upper and lower inductors. Induction heating device characterized by.