JP2603091B2 - Electric heating device row - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an energization heating suitable for heating mass-produced electrically conductive materials while continuously feeding them at high speed for various purposes. Related to the device row.

(Prior Art and Problems) FIG. 5 (a) shows the basic configuration of this type of conventional heating apparatus train.
Shown in

The drawing shows a case where the number of heating zones, which are current-carrying sections, is, for example, four, and comprises rolls a and b whose peripheral surfaces are opposed to each other with a predetermined gap interposed between the feed passages L of the material W to be continuously fed. The roll electrodes RO1, RO2,..., RO8 are arranged at predetermined intervals. For example, a commercial frequency, 100V power supply E1 is connected to the roll electrodes RO1, RO2.
The power supply E3 can be slid on the roll electrodes RO5 and RO6, and the power supply E4 can be slid on the roll electrodes RO7 and RO8 with the power receiving part provided on the shaft of one or both rolls (b in the figure). The power is supplied by connecting via a slider shown as an arrow S.
In this case, in order to ensure safety, power is supplied such that the phases of adjacent power supplies E are shifted from each other by 180 ° as shown by a black dot on the shoulder of each power supply E so that the instantaneous power supply voltages are opposite to each other. The voltage applied to the material to be heated W is minimized as shown in the waveform diagram to prevent an electric shock accident of the worker.

In the above configuration, the material to be heated W is conveyed through a predetermined gap, that is, a gap in which the material to be heated W can travel while being in contact with the rolls a and b, so that between the roll electrodes RO1 and RO2 to RO7 and RO8.
During the four passing sections, in other words, the four heating zones, the heating is performed to a predetermined temperature while passing through the heating zones.

 There is also an example of the apparatus shown in FIG. 5 (b).

The device example is a roll electrode RO1 to RO3 composed of rolls a and b.
Are arranged on the feed passage L of the material W to be heated, and the roll currents RO1 and RO2 are connected to the power source E1, and the roll electrodes RO2 and RO3 are connected to the power source E2. Also in this case, the voltages applied to the material to be heated W are set to cancel each other by shifting the phases of the power supplies E1 and E2 by 180 °.

In the above-described conventional energizing heating apparatus, a heating voltage appears on the roll electrode RO on the most entrance side and the most exit side, and the energization current leaks out of the heating zone via the traveling heating target material W. A current limiting reactor, indicated as CH, is placed on the feed passage L adjacent to the inlet and / or outlet side of the heating zone to prevent damage to other equipment due to leakage current, overheating of the material to be heated W, Alternatively, it is configured to prevent unexpected accidents such as danger to nearby workers.

(Problems existing in the prior art) Conventionally, the current-carrying heating device array requires the arrangement of the current-limiting reactor CH, and the arrangement of the current-limiting reactor CH lengthens the device array, resulting in high equipment cost and high manufacturing cost. There was.

In addition, when heating the mass-produced material to be heated W while feeding it at a high speed, a long apparatus row including a large number of roll electrodes on the feed passage L is required. As an example, an example of heating a thin steel sheet using the method shown in FIG. 5 (a) is as follows: Material to be heated: thickness 0.4 mm, width 1000 mm Passing speed: 600 m / min Heating temperature: 710 ° C. The heating time is 3.2 seconds under the above conditions under the conditions of 20 KA (commercial frequency AC power supply). Is Average resistivity of the material to be heated: 50μΩ ・ cm Therefore, the electrical resistance per meter: 1.25mΩ, and the voltage per meter required for 20KA flow: 25V Voltage 100V
Unit heating zone length: 100/25 = 4m Required heating zone number: 32/4 = 8 Therefore, the required number of roll electrodes is 16, so the equipment row becomes longer and the number of roll electrodes becomes larger. It was extremely large.

Since the roll electrode is constantly in contact with the material to be heated which is running at a high speed, the roll electrode gradually wears, and the electrical contact state with the material to be heated gradually deteriorates. As the electrical contact state worsens, a spark is generated between the roll electrode and the material to be heated, and a spark flaw is generated on the surface of the material to be heated. The period up to the occurrence of a spark varies depending on various conditions. However, since a spark flaw lowers or deteriorates the quality of a product, when a spark starts to occur, the production is interrupted and the roll electrode is replaced.

The greater the number of roll electrodes used, the more frequently the production interruption for replacing the roll electrodes becomes more frequent. Therefore, the reliability of the equipment decreases in inverse proportion to the number of roll electrodes used, and the productivity decreases and the maintenance cost increases. Therefore, improvement measures were sought.

Further, since the roll electrode is usually water-cooled, heat transfer occurs from the heated material to the roll electrode by heat conduction, and the heating efficiency decreases as the number of roll electrodes increases.

In addition, one side of the power supply circuit from the power supply to the roll electrode is grounded so that the potential of each part of the entire heating device, through which a large current flows, can be fixed as designed to ensure safety. Complete insulation is required for the roll electrode to be connected and the machinery and equipment supporting the roll electrode, which leads to an increase in equipment costs and a decrease in insulation during long-term use, resulting in leakage current through the insulation-degraded portion. As the number of roll electrodes is increased, the number of maintenance inspections and the number of maintenance inspections performed by stopping the production line are increased.

Referring to the conventional apparatus row shown in FIG. 5B, two intermediate roll electrodes RO1 to RO4 in the example of the apparatus shown in FIG. 5A are replaced with one roll electrode RO2. , The number of roll electrodes can be reduced to 3/4. However, this method requires three roll electrodes RO.
The end roll electrodes of each set which are formed as a set and are connected cannot be shared. That is, even if it is attempted to share, the currents flowing through the two sets at the same time are merged into the roll electrode shared by the first set and the second set at a certain moment. Because it is done.

Further, regarding the conventional device array, a spark is generated between the roll electrode and the material to be heated when the current flowing between the roll electrode and the material to be heated increases. The generation of spark depends on various conditions such as the size and material of the roll electrode, the pressing force between the roll electrode and the material to be heated, and the temperature relationship between the material to be heated and the roll electrode, but the allowable current that can flow without generating a spark there is a value i _1. On the other hand, the amount of heat generated by the material to be heated is proportional to the product of the square of the current I and the resistance r of the material to be heated between the roll electrodes. Therefore, the conduction current I
In order to increase the amount of generated heat while keeping the allowable current value i of not more than ₁ , the resistance r is increased, in other words, the distance between the roll electrodes is increased to increase the length of the material to be energized. There is no alternative but to increase it. For this reason, in the case of a large-capacity facility for mass-production in which a material to be heated is fed at a high speed, the entire apparatus becomes extremely long, resulting in an increase in facility costs.

(Purpose of the Invention) The present invention eliminates the need for a current limiting reactor, greatly reduces the number of roll electrodes, and provides high safety when heating and heating a material to be heated with a large current. It is an object of the present invention to provide a high-efficiency current-carrying heating device array capable of reducing the equipment space.

(Structure of the Invention) The structure of the first invention of the present application is as follows: (1) A device for heating a continuously fed material by contacting each of roll electrodes arranged at predetermined intervals along a feed path, and energizing and heating: 2) It comprises a plurality of annular transformers having a predetermined length disposed between the roll electrodes, and a conductive member bridged between the roll electrodes and connected through a slider. (3) Each of the transformers has an inner ring. It is formed so as to be a feed passage for the material to be heated, and is connected to a power source so that the voltages induced in the material to be heated by the respective transformers are all in the same direction. And (5) a relationship between the resistance R1 of the material to be heated between the roll electrodes and the resistance R2 of the conductive member with respect to the current flowing is set such that R1 >> R2. In the column.

(Operation of the First Invention) In the first invention of the present application, a plurality of transformers arranged between the roll electrodes induce a secondary voltage in the material to be heated having a high electrical resistance between the roll electrodes, and have a low electrical resistance. Since the conductive member is the return line of the secondary current, the function of energizing and heating the material to be heated with high efficiency, the function of lowering the impedance of the secondary side with respect to the primary side, and the majority of the power supply voltage are used for heating the material to be heated. The no-load voltage that is consumed and appears on the roll electrodes is extremely small, has almost no leakage to the outside through the material to be heated, and has an effect. Further, by disposing a plurality of transformers between the roll electrodes, Compared with a long and heavy unit transformer that is long and heavy according to the distance between the transformers, making it easier to manufacture and handle. This has the effect of ensuring the straight running of the material to be heated while eliminating the need for a metal electrode.

(Embodiment of First Invention) A first invention in which the first invention of the present application is a case where the material to be heated is a plate material.
This will be described in detail below with reference to an example of the apparatus shown in FIGS.

FIG. 1 (a) is a front view of an embodiment of an electric heating device row,
(B) is a sectional view taken along line XX in (a).

In the figure, RO1 and RO2 are respectively disposed on a feed path L of a material to be heated W at first and second positions arranged at predetermined intervals.
Each of the roll electrodes 1a to 1d is the first roll electrode RO1 described above.
An annular transformer arranged between the second roll electrodes RO2, 2
a and 2b are conductive members bridged between the roll electrodes RO1 and RO2, S is a slider connected to both ends of the conductive members 2a and 2b, and 3a to 3c are support rolls.

The roll electrodes RO1 and RO2 are formed of conductive materials having an axial length greater than or equal to the width of the material W to be heated. This is a configuration in which the devices are opposed to each other with a predetermined interval that allows them to pass while contacting the device, and there is no difference from the conventional device.

Each of the transformers 1a to 1d is formed by laminating, for example, a silicon steel plate or the like having properties suitable as a magnetic path in a square shape as shown in FIG. And a primary coil 12 wound around the inner and outer circumferences, and the inside of the ring forms a feed passage L for the material to be heated W. That is, the size of the ring-shaped cross-sectional space is determined by
In consideration of the distance in which the material moves in the width direction, that is, the swaying distance, the undulation in the vertical direction, for example, the wave and fluttering of the sheet generated in the case of a thin steel sheet and the deflection of the material to be heated W by catenary,
It is set so that it can pass in a non-contact state. Transformers 1a ~
1d is supplied from the power source E to the primary coil 12 via the power control switch SU as shown in FIG. 1 (c), for example. Therefore, each transformer 1a ~
1d is supplied with an alternating current in the same direction.

The conductive members 2a and 2b are made of a good conductive material such as a copper material having a predetermined width and thickness, which is disposed in close proximity to the outer periphery of each of the transformers 1a to 1d.

The sliding element S slides with a power receiving unit provided on, for example, a rotating shaft of the rolls a and b constituting the roll electrodes RO1 and RO2.
Contact is possible.

As the support rolls 3a to 3c, metal rolls, ceramic coating rolls, ceramic rolls, or the like are used. When using metal rolls, it is needless to say that the metal rolls must be electrically insulated from other mechanical equipment.

In the above configuration, the power supply from the power source E to each of the transformers 1a to 1d induces a secondary voltage in the same direction on the material W to be heated between the roll electrodes RO1 and RO2, and the secondary current generated in the material W to be heated. Are conductive members 2a, 2b connected via a slider S
Will flow as a return line.

Since the material to be heated W has a relatively high electric resistance and the conductive members 2a and 2b can be arbitrarily set to various parameters such as a sectional area, the resistance R1 of the material to be heated W and the resistance of the conductive member 2 can be set. It is very easy to make the relationship with R2 R1 >> R2.

Although the support rolls 3 in the configuration of the above embodiment are arranged below the horizontal feed path L, they may be arranged in the up and down directions, respectively, so that the heated material W can travel more linearly.

(Another embodiment of the first invention) In the above embodiment, an example in which four transformers 1a to 1d are arranged between the roll electrodes RO1 and RO2 has been described. It does not matter how many they are.

Although the above embodiment has been described with reference to the transformer 1 shown in FIG. 1B, for example, a transformer 10 having a configuration as shown in FIG. 1D may be used. That is, the space inside the ring of the iron core 11 is made a little larger, and a protective partition wall 13 is provided in the ring so as to surround the feed passage L of the material to be heated W and to be concentric with the iron core 11. The protective partition 13 has one layer or two layers as shown. In the case of a single layer, the protective partition 13 is made of a non-magnetic material, for example, a metal material such as stainless steel.
The material to be heated W is prevented from being damaged by coming into contact with the primary coil 12 due to shaking when passing through the transformer 10 or splashing at the time of an accident such as breakage. When the protective partition wall 13 has two layers, the non-magnetic metal material is used as the inner layer 131 and a heat insulating material, for example, a heat insulating fiber is used as the outer layer 132. Primary coil by radiant heat
Prevent 12 burnout. The material to be heated W is the primary coil 12.
If there is no risk of damage to the primary coil 12, the primary coil 12 may be prevented from being burned by forming a single layer only with a heat insulating material.

In addition, the primary coil 12 is used as a tube material, and the primary coil 12 is provided in the pipe.
12 Cooling water for cooling may be passed.

Further, each roll electrode RO has dust on the atmosphere and a material W to be heated.
In some cases, dust brought in gradually accumulates, and when contact with the material to be heated W is poor, a roll cleaner may be arranged.

Although not mentioned in the description of the above embodiment, the material to be heated W
Of course, the temperature control is performed for. That is, a preset operation in which the input to each of the transformers 1 to 10 is set to a predetermined value in advance so as to provide the required power to the material to be heated W in advance based on the size, the feed rate, the specific heat, the predetermined temperature rise temperature, etc. of the material to be heated W A method may be adopted. Although not shown, the output side of the device row or / and each transformer 1
Singular or plural predetermined positions between..., For example, FIG.
, The temperature of the material to be heated W is measured at one or both of 1c and 1d or between 1b and 1c, and when there is a difference between the measured value and the expected temperature, FIG. It is a matter of course that the feedback control method of adjusting the power corresponding to the difference by operating the power control switch SU in c) is adopted.

Further, the present invention is not limited to the case where the inputs of a plurality of transformers 1 are simultaneously adjusted by a power control switch SU as shown in FIG. 1 (c), and also, as shown in FIG. A power control switch SU may be interposed on the power supply circuit to each of the power supply circuits 1 and the input of each transformer 1 may be individually adjusted.

FIG. 2 shows an embodiment in which the two device rows shown in FIG. 1A are used and arranged vertically. In this case, a plurality of transformers 1a to 1R are disposed between one of two single-phase transformers Scott-connected to three-phase power and between the left-hand roll electrodes RO1 and RO2 in the drawing.
It is possible to adopt a circuit configuration in which power is supplied to 1d and from the other side is supplied to a plurality of transformers 1a to 1d arranged between the right-hand roll electrodes RO1 and RO2 in the figure. With this circuit configuration, unbalance of three-phase voltages does not occur, and the advantage that a balancer is not required is brought.

As an additional remark, the device row of the present invention can be arranged not only horizontally or vertically but also at any angle.

(Structure of the Second Invention) The second invention of the present application is a further development and diversification of the first invention, and the structure is such that continuously heated materials to be heated are arranged at predetermined intervals along a feed passage. A device that contacts and heats a plurality of roll electrodes and heats it by connecting one or more annular transformers placed between adjacent roll electrodes and a sliding element between the adjacent roll electrodes. Each of the transformers is formed such that the inside of the ring becomes a feed passage of the material to be heated, and each of the transformers is connected to a power source so that a voltage in the same direction can be induced in the material to be heated. It is arranged close to the outer circumference of the transformer between the roll electrodes, and the relationship between the resistance R1 of the material to be heated and the resistance R2 of the conductive member with respect to the current flowing between the roll electrodes is set so that R1 >> R2. The current value induced in the material to be heated between at least one or more roll electrodes is set to be larger than the current value induced in the material to be heated between at least one or more other roll electrodes. , In a row of electric heating devices.

(Function of the Second Invention) The second invention of the present application has a configuration in which a conductive member is disposed between roll electrodes to form a return line of a secondary current induced in a material to be heated, and a plurality of transformers between predetermined roll electrodes are provided. Since the same action as that of the first aspect of the invention is provided from each of the above configurations and the voltage induced in the material to be heated is in the same direction, power is supplied to the transformer with a different current value for each roll electrode. Even if the roll electrode
Since only a difference current flows between the materials to be heated, an operation capable of supplying a current equal to or greater than the allowable current value of the roll electrode to the transformer between the predetermined roll electrodes is achieved. The effect of efficiently heating the material to be heated and the effect of making the device array more compact are provided.

(Embodiment of Second Invention) The second invention of the present application will be described in detail below with reference to an embodiment shown in FIGS. 3 (a) and 3 (b).

(A) of FIG. 3 is a front view of the device row of the embodiment,
(B) is an electric circuit diagram for explaining the principle of the present invention.

In FIG. 3 (a), RO1 to RO6 each have first to sixth roll electrodes, each of which includes rolls a and b whose peripheral surfaces are opposed to each other with a predetermined gap therebetween with respect to a feed path L of the material to be heated W,
Transformers 1a to 1g each have the same cross-sectional shape as in the first invention described above, and the inside thereof has a feed passage L for the material to be heated W. 2a to 2j are conductive members, 3a and 3g, respectively.
b Each is a support role.

In this embodiment, the third roll electrode RO3 and the fourth roll electrode RO4
A plurality of transformers 1c to 1e are arranged between the
The point that 2e and 2f are bridged is the same as in the first invention, but between the first roll electrode RO1 and the second roll electrode RO2, between the second roll electrode RO2 and the third roll electrode RO3, and the fourth roll electrode RO.
4. Between the fifth roll electrode RO5 and the fifth roll electrode RO5
The present invention is different from the first invention in that a single transformer 1 is arranged between the sixth roll electrodes RO6, and a conductive member having a length corresponding to the interval is bridged between each roll electrode RO. Transformers 1a and 1 placed singly between the roll electrodes RO
b, 1f and 1g are short, and a plurality of transformers 1
c, 1d and 1e also differ from the first invention in that they are long.

Power supply to all the transformers 1a to 1g in the above configuration is connected to a power supply (not shown) so that a secondary voltage in the same direction is induced in the material to be heated W. The predetermined current not more than the allowable current value i ₁ at which spark does not occur between the roll electrode RO and the material to be heated W is defined as I _1.
And ...... I ₁ by ...... 2 × I ₁ trans 1g by ...... 3 × I ₁ trans 1f by ...... 2 × I ₁ trans 1c~1e by ...... I ₁ transformer 1b current is induced by the transformer 1a in becomes as is as the setting for the power supply as a current induced in the material to be heated W between roll electrode occupying a given position is doubled, three times the current value of the predetermined current I _1.

By setting the above-mentioned power supply, as shown in the circuit diagram of FIG.
The corresponding induced current flows through the roll electrode RO
The current flowing into or out of each roll electrode RO from the conductive member 2 made of two members bridged between them, In the end, the current flowing between all the roll electrodes RO and the material to be heated W maintains I ₁ which is equal to or less than the allowable current value i ₁ ,
The heated material W between the roll electrode RO3 · roll electrode RO4 will flow three times the current of I _1.

Accordance connexion, under the conditions that a constant heating temperature of the heated material W located between the electrodes, sufficient in inter-electrode spacing of 1/9 the feed rate as compared with the case of heating at a current value I ₁ as the same, or When the distance between the electrodes is the same, the feeding speed of the material to be heated W can be increased nine times.

Further, in this configuration, the supply current is gradually increased as described above,
In the step-down, between the roll electrodes for the step-up and step-down, that is, in the embodiment, between RO1 and RO2, between RO2 and RO3, and between RO4 and RO5.
The distance between the two and between RO5 and RO6 can be set to be extremely short, so that the proportion of the total length of the device row is small.

Also, the number of roll electrodes is greatly reduced as compared with the conventional device row.

(Another embodiment of the second invention) FIGS. 4 (a) to 4 (d) show an apparatus row of another embodiment of the second invention, in which a thin plate material having a thickness of, for example, 0.2 to 2.0 mm is heated. This is the case where the material W is used.

In FIG. 4A, RO1 to RO4 are roll electrodes, 1a to 1e are transformers, and 2a to 2f are conductive members. Although each of the above embodiments has been described with an example in which the roll electrodes RO are configured by the rolls a and b having a conductive surface as the roll electrode RO, this embodiment employs the roll electrodes RO2 to RO4 as those of the above embodiments. Although having the same configuration, the roll electrode RO1 located on the entry side of the material to be heated W has a different configuration. The roll electrode RO1 is located at a position where it comes into contact with the material to be heated W whose temperature has not yet risen, and by using this positional relationship, it is constituted by a pair of rolls b made of a conductive material and an auxiliary roll shown as 5.

The auxiliary roll 5 is a roll having an elastic surface, for example, a lining made of a rubber material or the like.
In the roll electrode RO made of b, the material W to be heated can pass through the gap between the opposing peripheral surfaces as shown in FIG. RO1
There is no gap between the opposing roll b and the auxiliary roll 5 in FIG. 5, but rather, as shown in FIG. 4 (c), the roll b bites into the elastic auxiliary roll 5 and the auxiliary roll 5
The auxiliary roll 5 is disposed with a pressing force P applied so that a predetermined range of the auxiliary roll 5 has a concave arc.

Accordingly, the material W to be heated having a small thickness passing through the roll electrode RO1 comes into contact with the peripheral surface of a predetermined range of the roll b made of a conductive material as shown in FIG.
Because maintaining the surface contact as compared to O4 is line contact, the allowable current value i ₁ that does not generate a spark is dramatically large.

Thus, power is supplied to each of the transformers 1a to 1e in the apparatus row of the present embodiment having the above-described configuration, and I _{1 which is} equal to or less than the allowable current value i ₁ for the roll electrode RO composed of the conductive material rolls a and b is supplied.
When it is three times that of the roll electrode RO1,
Current induced in the material to be heated W by each of the transformer 1 is powered as an ...... I ₁ by ...... 2 × I ₁ trans 1d by ...... 3 × I ₁ trans 1d by transformer 1 a to 1 c. With this power supply setting, as shown in FIG. 4 (d), a corresponding induced current flows through each of the heated members W between the respective roll electrodes instantaneously as in the above-described embodiment, and at the same time, the roll electrode and the heated member The current flowing between W is Between the roll electrode RO2 and the heated material W, and the roll electrode RO3
- the material to be heated W and between the currents I ₁ flows respectively between roll electrode RO4-material to be heated W, roll electrode RO1-be-heated material W
Will flow three times the current of I ₁ is between.

However, since the allowable current value i between the roll electrode RO1 and the material W to be heated is three times that of the other roll electrodes RO2 to RO4, there is no possibility that a spark is generated between the roll electrode RO1 and the material W to be heated.

Therefore, in this embodiment, it is possible to omit the feed current increasing zone located on the side of the material W to be heated in the apparatus row while supplying a large current.

It should be noted that also in the second invention of the present application, it is possible to supply power to the device row from two single-phase transformers that are Scott-connected with three-phase AC power. In this case, one of the single-phase transformers supplies the plurality of transformers 1 to which electric power proportional to approximately one-half of the total electric power used in the device row is supplied, and the other single-phase transformer supplies the remaining plurality of transformers 1. What is necessary is just to comprise so that it may each feed from a container.

(Effect of the Invention) The current-carrying heating device row according to the present invention does not require a current-limiting reactor and can greatly reduce the number of roll electrodes as compared with the conventional case, when heating and heating a material to be heated with a large current at a high current. , And furthermore, it is possible to make the equipment space extremely compact.
In addition, since the material to be heated can be heated with high efficiency while maintaining safety, the labor and cost required for equipment and maintenance can be drastically reduced. In addition, the reliability of the equipment array is dramatically increased. Since various combinations of constituent devices can be formed according to the purpose of heating, the effect of the present invention is awarded as being extremely remarkable.

[Brief description of the drawings]

FIG. 1 (a) is a front view showing one embodiment of the first invention of the present application,
FIG. 1 (b) is a sectional view taken along line XX in FIG. 1 (a),
FIG. 1 (c) is a power supply circuit diagram in the device row of the first invention, FIG. 1 (d) is a cross-sectional view of another embodiment of the transformer used in the first invention, and FIG. FIG. 2 is a front view showing another embodiment of the first invention, FIG. 3 (a) is a front view showing one embodiment of the second invention of the present invention, FIG. FIG. 3 (b) is an electric circuit diagram for explaining the principle of the second invention, FIG. 4 (a) is a front view showing another embodiment of the second invention, and FIGS. 4 (b) and (c) respectively. Second
FIG. 4 (d) is an electric circuit diagram of FIG. 4 (a), FIG. 5 (a) is a front view of a conventional energization heating device row, FIG. 5 (b) () Is a front view of another conventional energization heating device row. W: Material to be heated L: Feeding passage RO, RO1, RO2 ~ ... Roll electrode S: Slider E: Power supply 1,1a, 1b ~ ... Transformer 2,2a, 2b ~ ... Conductive member

Continuation of the front page (72) Inventor Yuki Sato 2-16-21 Higashi-Gotanda, Shinagawa-ku, Tokyo Inside the high-frequency refining Co., Ltd. (72) Inventor Yugo Yao 2- 16-21 Higashi-Gotanda, Shinagawa-ku, Tokyo High-frequency heat (56) References JP-A-63-128125 (JP, A) JP-B-44-4318 (JP, B1)

Claims (2)

(57) [Claims] An apparatus for heating an electric current by bringing a material to be continuously fed into contact with roll electrodes arranged at predetermined intervals along a feed passage has a predetermined length arranged between the roll electrodes. It is composed of a plurality of annular transformers and a conductive member that is bridged between the roll electrodes and connected via a slider. Each of the transformers is formed so that the inside of the loop becomes a feed passage for the material to be heated. The transformer is connected to a power supply such that all voltages induced in the material to be heated are in the same direction, and the conductive member is disposed close to the outer periphery of each of the transformers, and the resistance R1 of the material to be heated between the roll electrodes with respect to a current flowing therethrough. A current-carrying heating device row, wherein the relationship with the resistance R2 of the conductive member is set so that R1 >> R2. 2. A device for continuously heating and feeding a material to be heated by contacting a plurality of roll electrodes arranged at a predetermined interval along a feed passage is disposed between adjacent roll electrodes. It is composed of one or more annular transformers, and a conductive member that is bridged between adjacent roll electrodes and connected through a slider. Each of the transformers is formed so that the inside of the loop becomes a feed passage for the material to be heated. In addition, the conductive member is connected to a power source so that a voltage in the same direction can be induced in the material to be heated, and each of the conductive members is disposed close to the outer periphery of a transformer between the roll electrodes. The relationship between the resistance R1 and the resistance R2 of the conductive member is set so that R1 >> R2, and the current value induced in the material to be heated between at least one or more roll electrodes is at least another value. The current-carrying heating device row, wherein the current value is set to be larger than the current value induced in the material to be heated between one or more roll electrodes.