JP3156770B2 - Induction heating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating apparatus for heating a sheet-like material to be conveyed on a hot rolling line for steel in the middle of the line.

[0002]

2. Description of the Related Art Generally, in a hot rolling line for steel, a plate-shaped material to be heated (slab) heated in advance to a high temperature in a heating furnace is continuously passed through a rolling mill to be processed into a thin plate. I have. When a thin plate is rolled in such a steel hot rolling line, the distance from the heating furnace to the rolling mill is long, so that there is a problem that the temperature drops before reaching the rolling mill. For this reason, the plate-like material to be heated is heated in the middle of the line to raise the temperature of the whole once, and then both ends are locally heated by an edge heater to make the whole substantially uniform temperature state and passed through a rolling mill. Rolled into thin plates.

[0003] As described above, an induction heating device for heating the entire plate-shaped material to be heated in the middle of a line to increase the temperature is a heater formed by a solenoid coil which is elongated in the width direction of the plate-shaped material to be heated. Forming a cylindrical heating passage inside the
The plate-like material to be heated is passed through this heating passage to perform induction heating on the whole. Further, a conventional induction heating device is integrally provided with a high-frequency power supply device having a condenser for supplying electricity to a heater and a water supply mechanism, and the device having this integral structure is fixed to a line.

Further, in this induction heating apparatus, a heater portion which is affected by radiant heat from a plate-like material to be heated to a high temperature is most easily damaged during operation, and maintenance such as inspection and replacement of parts is appropriately performed. There is a need.

However, since the conventional induction heating apparatus has a structure in which a heater and a high-frequency power supply are fixed to the line, the line must be stopped when the apparatus is disassembled or inspected. In addition, a plurality of induction heating devices are installed via transport rolls, and the distance between adjacent induction heating devices is as narrow as 400 mm or less. There was a bad problem.

[0006]

SUMMARY OF THE INVENTION The present invention eliminates the above-mentioned drawbacks, improves the workability by attaching a heater and a power supply unit to a carriage on a rail and performing maintenance without stopping the line, and further improves the heater body. Provide an induction heating device that has a split structure with the power supply unit, retracts from the rolling line during maintenance, separates the heater body from the power supply unit here, and transports the heater body to another location for maintenance. It is.

[0007]

According to a first aspect of the present invention, there is provided an induction heating apparatus comprising a heater provided on a rail orthogonal to a conveying direction of a plate-like material to be conveyed conveyed on a hot rolling line for steel. A carriage, a heater body detachably mounted on the heater carriage, and a tubular heating passage formed inside a solenoid coil that is horizontally elongated in the width direction of the plate-like material to be heated, and the rail. A high-frequency power supply unit provided with a driving wheel running on the top, a high-frequency power supply unit provided with a condenser and a water supply mechanism protruding forward provided on the upper side, and a high-frequency power supply unit formed on the upper part of this power supply truck, Along with being disposed behind the heater carriage so as to overlap above the heater body mounted on the heater carriage, a high-frequency power supply unit of the power supply carriage is provided so as to be able to run on the heater body mounted on the heater carriage. It is characterized in that the power trolley and the heater carriage to disengageably connected.

According to a second aspect of the present invention, there is provided an induction heating apparatus, wherein a plurality of heater carts are arranged in parallel via a transport roll, and the heater carts are arranged so as to overlap above the heater bodies respectively mounted on the plurality of heater carts. 1 with high frequency power supply
A plurality of heater trolleys are provided, and a plurality of heater trolleys and one power trolley are detachably connected.

Further, in the induction heating apparatus according to the present invention, an axle raising guide is provided on a connecting surface of the power trolley to the heater trolley, and when the power trolley and the heater trolley are connected, the axle on the rear wheel side of the heater trolley is connected. The rear wheel of the heating cart is received by the axle raising guide, and the rear wheel of the heating cart is lifted off the rail, so that the driving wheel of the power cart and the front wheel of the heating cart are integrally connected to travel.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention is shown in FIG.
This will be described in detail with reference to FIG. In the drawing, reference numeral 1 denotes an induction heating device, as shown in FIGS. 1 and 2, L-shaped heater carts 2A and 2B, rectangular parallelepiped heater bodies 3A and 3B mounted thereon, and this heater body 3
A and LB are combined with an inverted L-shaped power supply cart 4 which is detachably connected so as to be simultaneously overlapped on top of A and 3B.

As shown in FIG.
A plurality of plate-like materials to be heated 6 are provided along a rolling line to be conveyed, and a plurality of conveyance rolls 7 are arranged therebetween. Further, a plurality of rails 8a, 8b... 8h are laid between the transport rolls 7.
L-shaped heater carriages 2A, 2B are provided on the rails 8a, 8b, and L-shaped heater carriages 2A, 2B are also provided on adjacent rails 8c, 8d via the transport rolls 7. Have been.

As shown in FIG. 2, the heater bodies 3A and 3B mounted on the L-shaped heater carts 2A and 2B are provided with solenoid coils 12 which are horizontally elongated in the width direction of the plate-like material 6 to be heated. Is formed with a cylindrical heating passage 13 inside. Also, rails 11a and 11b are provided on the upper surfaces of the heater bodies 3A and 3B as shown in FIG.
Two cooling water pipes 14 for water supply and drainage are provided on the front.
a, 14a are mounted in the vertical direction, and the solenoid coil 1
2 is water-cooled. Cooling water piping 14
The upper portions of b and 14b are guided by a cable bear 26 together with a bus bar 25 as shown in FIG.

As shown in FIG. 2, front wheels 9a, 9a and rear wheels 9b, 9b are provided at the bottoms of L-shaped heater carts 2A, 2B.
b is attached so that the vehicle can run on the rails 8a and 8b. Also, L-shaped heater carts 2A, 2A,
Rails 11c and 11d are also attached to the upper surface of the vertical portion of B, and when the heater main bodies 3A and 3B are mounted on the L-shaped heater carts 2A and 2B, the whole is combined into a rectangular parallelepiped, and the rails 11a and 11a on the upper surface are combined. The rail 11c and the rail 11b and the rail 11d are linearly continuous.

Further, as shown in FIG.
A high frequency power supply unit 16 provided with a condenser 15 and a control circuit is provided inside a horizontal part protruding forward in the upper part, and driving wheels 18 connected to a motor 17 are mounted on a lower part of the vertical part. The drive wheels 18, 18 run on rails 8a, 8b. The front wheel 20 is located at the bottom of the horizontal part.
20 is mounted, and runs on the rails 11a and 11b of the heater bodies 3A and 3B and the rails 11c and 11d on the upper surfaces of the heater carts 2A and 2B.

As shown in FIG. 4, an L-shaped axle raising guide 21 is protruded from the lower front side of the vertical portion of the power trolley 4, and when the power trolley 4 is connected to the heater trolleys 2A and 2B, the heater Axles 1 on the rear wheels 9b side of the bogies 2A and 2B
0 is guided by the axle raising guide 21 so that the rear wheel 9b is lifted off the rails 8a, 8b, 8c, 8d.

As shown in FIG. 1, four cooling water pipes 14b are attached from the front to the upper surface of the horizontal portion of the power trolley 4, and two cooling water pipes 14b are attached to the front of the heater bodies 3A and 3B. The water pipes 14a are connected to the connection flanges 23 and are opened and closed by valves 27. As shown in FIG. 2, the upper portions of the cooling water pipes 14 b are guided to the upper surface of the high-frequency power supply unit 16, and are guided by the cable bear 26 together with the bus bar 25.

A plurality of the induction heating apparatuses 1 having the above-described configuration are installed along a rolling line, and when the plate-like material 6 conveyed on the conveying rolls 7 passes through the cylindrical heating passage 13,
The whole is induction-heated by the heater formed by the solenoid coil 12, and the temperature rises. As described above, the entire temperature of the plate-like material to be heated 6 gradually increases while sequentially passing through the plurality of induction heating devices 1.

When performing maintenance such as inspection of the induction heating device and replacement of parts, for example, when performing maintenance on the induction heating devices 1A and 1B as shown in FIG. Is rotated to run on the rails 8a, 8b, 8c, 8d... 8h and retracted from the rolling line.

At this time, as shown in FIG. 4, an axle raising guide 2 having an L-shape is provided on the lower front side of the vertical portion of the power supply truck 4.
1 is protruded, and the power trolley 4 and the heater trolleys 2A and 2B are connected, so that the rear wheels 9 of the heater trolleys 2A and 2B
The axle 10 on the b side is supported by the axle raising guide 21, and the rear wheel 9b is in a state of floating from the rails 8a, 8b, 8c, 8d. That is, the induction heating device 1 includes the drive wheels 18 of the power supply cart 4 and the front wheels 9 of the heater carts 2A and 2B.
a ... and the weight is dispersed back and forth, so that the vehicle can run stably.

In this case, when the heater body 3A of the induction heating device 1A is replaced as shown in FIG. 7 and only the other heater bodies are to be inspected, the valve 27 of the cooling water pipe 14b is first turned on as shown in FIG. Tighten, then cooling water piping 14
The connection flange 23 connected to b is removed to release the connection. Next, when the drive wheels 18 of the power supply truck 4 are rotated and retracted together with the heater truck 2B, the rear wheels 9b of the heater truck 2A are disengaged with the axle 10 disengaged from the axle lift guide 21 as shown in FIGS. , Heater cart 2A
Is stopped by being supported on rails 8a and 8b by four wheels.

When the power trolley 4 and the heater trolley 2B are retracted in a state where the heater trolley 2A is separated and stopped, the heater trolley 2A is attached to the bottom end of the high-frequency power supply section 16 projecting forward from the upper part of the power trolley 4. The front wheels 20, 20 run on the rails 11a, 11b on the upper surface of the heater body 3A.
Further, as shown in FIGS. 5 and 6, a rail 11c attached to the upper surface of the vertical portion of the heater cart 2A,
Since the vehicle travels 11d and stops and is supported by the vertical portion of the L-shaped heater truck 2A, it is possible to prevent the inverted L-shaped power truck 4 to which the high-frequency power supply unit 16 with a heavy upper portion is attached from tipping over. it can.

Next, the heater body 3A mounted on the heater carriage 2A separated from the power supply carriage 4 is lifted and moved by a crane 28 as shown in FIG. 6, and another heater body 3A to be replaced is carried in. Then, it is placed on the heater cart 2A and the replacement is completed. Another heater body 3B
And heater body 3A, 3B of adjacent induction heating device 1B
When the inspection is performed, as shown in FIG. 7, since the adjacent induction heating devices 1A to 1C are arranged in a shifted state,
A sufficiently large space for the worker is secured, and the work can be easily performed.

When the replacement or inspection is completed, the drive wheels 1
When the power trolley 8 is rotated to move the power trolley 4 forward, the rear wheel 9b hits the stopped heater trolley 2A and is raised by being guided by the axle raising guide 21 as shown in FIG. The heater cart 2A is integrally connected with the heater cart and moves forward to return to the rolling line.

In the above description, two heater carts 2 on which heater bodies 3A and 3B are mounted are mounted on one power cart 4.
Although the case where A and 2B are connected is shown, a structure in which one or three units are connected may be used.

[0025]

As described above, according to the induction heating apparatus of the first aspect, the heater main body and the power supply section have a divided structure, and can be withdrawn from the rolling line during maintenance so that repair and replacement can be performed. Since the working space can be widened without stopping the line, workability can be improved. Furthermore, since the heater main body can be separated from the power supply unit in the retracted state, and the heater main body can be transported to another place for repair or replacement, workability can be further improved.

In the induction heating apparatus according to the second aspect, since a plurality of heater bodies and one power supply truck are combined to share a high-frequency power supply unit, the structure can be reduced in size and the vehicle can run stably. Can be.

Further, in the induction heating apparatus according to the third aspect, when the power trolley and the heater trolley are connected to each other and run, the weight of the front and rear wheels is increased while the rear wheel of the heater trolley located at the middle is lifted off the rail. Since the components are dispersed, a heavy device can be stably driven.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which a plate-shaped material to be heated being conveyed on a rolling line according to an embodiment of the present invention is heated by an induction heating device.

FIG. 2 is a front view of the induction heating device shown in FIG.

FIG. 3 is a side view showing the induction heating device shown in FIG. 1 with a part cut away.

FIG. 4 is a perspective view showing a state in which an axle of a rear wheel of a heater cart is supported by an axle raising guide attached to the power cart.

FIG. 5 is a front view showing a state in which the heater trolley is separated by retracting the power trolley.

6 is a perspective view showing a state where the heater main body is lifted by a crane from the state of FIG.

FIG. 7 is a plan view showing a state where two induction heating devices are retracted from a line.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Induction heating apparatus 2 Cart 2A Heater cart 2B Heater cart 3A Heater body 3B Heater body 4 Power trolley 6 Plate-shaped material to be heated 7 Transport roll 8a Rail 9a Front wheel 9b Rear wheel 10 Axle 11a Rail 12 Solenoid coil 13 Cylindrical heating passage 14a Cooling water pipe 16 High frequency power supply 18 Drive wheel 21 Axle rise guide

Continuation of the front page (72) Inventor Tetsuji Doizaki 1-1-1, Shibaura, Minato-ku, Tokyo Inside the head office of Toshiba Corporation (56) References JP-A-54-102637 (JP, A) 4-63594 (JP, U) JP-A-5-34697 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) H05B 6/10 381

Claims (3)

(57) [Claims] 1. A heater cart provided on a rail orthogonal to a conveying direction of a plate-like material to be conveyed conveyed on a hot rolling line for steel, a plate being detachably mounted on the heater cart. A heater body having a cylindrical heating passage and drive wheels running on the rails are provided inside a solenoid coil having a shape elongated in the width direction of the plate-like material to be heated, and a condenser and a water supply mechanism are provided on the upper side thereof. A high-frequency power supply unit provided with a high-frequency power supply unit protruding forward, and a heater trolley formed such that the high-frequency power supply unit formed above the heater trolley overlaps a heater body mounted on the heater trolley. The high-frequency power supply section of the power trolley is provided so that it can run freely on the heater body mounted on the heater trolley, and the power trolley and the heater trolley are connected in a freely disengageable manner. Induction heating device. 2. A single unit having a plurality of heater carts arranged side by side via a transport roll, and having a common high-frequency power supply unit so as to overlap above the heater main bodies mounted on the plurality of heater carts, respectively. 2. The induction heating apparatus according to claim 1, wherein a plurality of heater trolleys and one power trolley are detachably connected to each other. 3. An axle raising guide protrudes from a connection surface of the power trolley to the heater trolley, and a heater axle on the rear wheel side of the heater trolley is received by the axle raising guide when the power trolley is connected to the heater trolley. Lift the rear wheel off the rails,
The induction heating device according to claim 1 or 2, wherein the vehicle runs while being connected integrally with a drive wheel of the power supply truck and a front wheel of the heater truck.