JPH11283735A - Heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating device where an object to be heated is visible by retreating an induction coil during application of pressure, and the device including the attached wiring/piping can be simplified because the induction coil is moved up and down within the frame, also the vertical position of the object to be heated is easily objected to that of the induction coil, further the internal temperature is raised to uniform the internal temperature distribution. SOLUTION: In this heating device 1, an object to be heated 10 surrounded by an induction coil 6 is set between a pair of platens 4, 5, and it is applied with pressure through the platens 4, 5, at the same time, the induction coil 6 is turned on to heat the object to be heated 10 by electromagnetic induction. The induction coil 6 can be retreated up or down from the position where the object 10 between the platens 4, 5 is surrounded by the coil 6, with the platen 4 or the platen 5 perforating the induction coil 6. While, means 8A, 8B are provided in order to retreat the induction coil 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a heating device. More specifically, the present invention relates to a heating device capable of performing electromagnetic induction heating while applying pressure.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 6, a heating device 31 capable of performing electromagnetic induction heating while applying pressure is provided with a rectangular frame-shaped press frame 32 for supporting a pressing force and a substantially central portion in the press frame 32. The upper platen 34 and the lower platen 35 arranged to be in contact with the object to be heated 33 placed above and below, the induction coil 36 surrounding the outer periphery of the object to be heated 33, and the upper part of the press frame 32. A slider 39 which is connected to the pressurizing cylinder 37 and the return cylinder 38 and slides up and down to transmit a pressing force to the object 33 to be heated via the upper platen 34;
5, a mounting table 41 on which the object to be heated 33 and the induction coil 36 are mounted, and a roller 42 a for carrying the mounting table 41 from a lateral direction are rotatably supported. Is mounted on the lower platen 35 to adjust and support the mounting table 41 on the lower platen 35. Note that heat insulating materials 43 and 44 are provided between the upper platen 34 and the slider 39 and between the lower platen 35 and the cradle 40. In addition, passages 34a and 35a for passing steam as a heat medium are formed inside the upper and lower platens 34 and 35.

[0003]

In the above-described heating device 31, the induction coil 3 is placed on the mounting table 41 together with the object 33 to be heated.
6, there is a problem in that the induction coil 36 is retracted during pressurization and the object to be heated 33 cannot be visually observed. As the object to be heated 33, there is a material in which a laminated body of rubber and a magnetic plate is housed in a mold. The state of the rubber flowing out of the burr hole cannot be checked during pressurization.

When the object to be heated 33 is set on the heating device 31, the induction coil 36 slides along with the mounting table 41 from the lateral direction.
Also, the wiring and piping of the induction coil 36 must be configured so as to be able to slide, and there is a problem that the device becomes extremely complicated and large. For the winding of the induction coil 36, a hose is used to prevent the temperature of the winding from rising. In order to simplify the wiring and piping for that purpose, it is preferable not to move the induction coil.

Further, the object 33 to be heated has several kinds of heights. Conventionally, a plate-like spacer is bitten above and below the object to be heated according to each height, and the height of the object 33 in the vertical direction is increased. The center line m and the vertical center line m of the induction coil 36 are adjusted so as to coincide with each other so that the internal temperature of the object to be heated becomes uniform. However, if the thicknesses of the spacers are not the same in the upper and lower portions, the heat conduction from the upper and lower platens is not uniform, and there is a problem that this adjustment is very difficult.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to retract an induction coil during pressurization so that an object to be heated can be visually recognized. The equipment can be simplified, including the attached wiring and piping, and the height of the object to be heated and the induction coil can be easily adjusted, and the temperature can be raised so that the internal temperature distribution is uniform. It is to provide a heating device.

[0007]

According to the first aspect of the present invention, an induction coil surrounding an outer periphery of an object to be heated is arranged between upper and lower platens, and the object to be heated in the induction coil is disposed via the upper and lower platens. A heating device that conducts electromagnetic induction heating by energizing the induction coil while applying pressure, wherein the induction coil moves upward or downward from a position surrounding the object to be heated between the upper and lower platens. It is characterized in that it is configured to be able to retreat by passing through the platen, and is provided with elevating means for retreating the induction coil. The heated object can be visually checked by retracting the induction coil in a pressurized state (a state in which the object to be heated is sandwiched between the upper and lower platens). Therefore, the appearance of burrs flowing out of the mold during vulcanization can be seen. The induction coil moves upward or downward by the height of the object to be heated + α, so that wiring and piping can be simplified. In addition, the vertical position of the induction coil can be easily adjusted according to the height of the object to be heated. Therefore, the vertical center line of the induction coil is aligned with the vertical center line of the object to be heated, so that the lines of magnetic force penetrating the object to be heated can be drawn in a vertically symmetrical figure.

According to a second aspect of the present invention, there is provided a pair of platens for sandwiching an object to be heated from above and below, a platen elevating means for raising and lowering at least one of the platens with respect to the other platen, A pressurizing means for applying a pressing force to the object to be heated via a platen, an induction coil surrounding the outer periphery of the object to be heated by electromagnetic induction, and an induction coil elevating means for elevating and lowering the induction coil are provided. It is characterized by the following. The platen elevating means and the pressurizing means are provided on one of the upper and lower platens. As the platen elevating means and the pressurizing means, a fluid pressure cylinder can be adopted. Further, the platen elevating means and the pressurizing means may be shared by one actuator. However, two actuators may be used separately for their respective roles. Thus, the hydraulic cylinder can be used optimally. The induction coil elevating means is capable of moving the induction coil upward or downward, and includes a hydraulic cylinder, a winch,
A screw mechanism, a linear gear mechanism, or the like generally used as a lifting / lowering or sliding means can be appropriately selected and used.

According to a third aspect of the present invention, in addition to the second aspect, the inner diameter of the induction coil is made larger than the outer diameter of one of the pair of platens.
Further, the induction coil elevating means moves the induction coil to a platen side having an outer diameter smaller than the inner diameter of the induction coil, at least at the height of the object to be heated. With the pressurized state (the state in which the object to be heated is sandwiched between the upper and lower platens), retract the induction coil,
The object to be heated can be visually confirmed. The induction coil moves upward or downward by the height of the object to be heated + α, so that the wiring and piping can be simplified. In addition, the vertical position of the induction coil can be easily adjusted according to the height of the object to be heated.

[0010]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view of one embodiment and another embodiment of the heating device of the present invention, FIG. 2 is an explanatory view of a vibration-proof member,
3 and 4 show examples of the object to be heated, and FIG. 5 is an explanatory view of still another embodiment of the heating device of the present invention.

Referring to FIG. 1, a heating apparatus 1 of the present invention is in contact with a rectangular frame-shaped press frame 2 for supporting a pressing force and an object to be heated 10 which is placed substantially in the center of the press frame 2. Platen 4 and lower platen 5 arranged as described above, induction coil 6 surrounding the outer periphery of object 10 to be heated, pressurizing cylinder 7 and return cylinder (not shown) mounted above press frame 2. A slider 23 which is connected and slides up and down to transmit a pressing force to the object to be heated 10 via the upper platen 4;
, A mounting table 21 on which the object to be heated 10 is mounted, and a roller 22a for slidingly mounting the mounting table 21 to be carried in and rotatably supported.
1 is provided with a roller-equipped elevating table 22 for adjusting the position in the up-down direction and mounting the mounting table 21 on the lower platen 5.
Note that heat insulating materials 24 and 25 are provided between the upper platen 4 and the slider 23 and between the lower platen 5 and the cradle 20. Also, inside the upper and lower platens 4 and 5,
Passages 4a and 5a for passing steam as a heat medium are formed. Further, a vibration isolating member 9 is provided between the induction coil 6 and the mounting table 21.

The induction coil 6 is, as shown in FIG.
The induction coil raising / lowering means 8A or 8B moves the solid object surrounding the object to be heated in the vertical direction from a solid line position to a retracted position shown by a two-dot chain line. In FIG. 1, the induction coil elevating means 8A shown on the right half uses a cylinder as a driving means, and the induction coil elevating means 8B shown on the left half uses a winch.

The press frame 2 is a frame having a strength opposing the pressing force applied to the object 10 to be heated.

The upper and lower platens 4 and 5 are hot plates (steam platens) having steam passages 4a and 5a therein, and can be closely contacted above and below an object to be heated and can be heated by heat conduction from above and below. In addition, as the heating mechanism inserted into the upper and lower platens 3 and 4, a heating mechanism generally used conventionally as a heating mechanism such as a heating wire can be appropriately used.

The upper platen 4 is a disk smaller than the inner diameter of the induction coil 6. When the induction coil 6 retreats upward, the induction coil 6 passes outside the upper platen 4.
The shape of the upper platen 4 is not limited to a disk, and the shape and size thereof can be appropriately selected according to the shape of the induction coil 6.

On the lower platen 5, the object to be heated 10 placed on the mounting table 21 is transported and set from the front or the left and right direction (the direction horizontal to the surface of the lower platen 5).
The size and shape of the lower platen 5 need only be larger than the outer diameter of the object 10 to be heated, and are not particularly limited. On the lower surface of the lower platen 5, a cradle 20 is provided between the lower platen 5 and the press frame 2.

The induction coil 6 generates an eddy current in a metal plate constituting the object to be heated 10 to generate Joule heat. The induction coil 6 is disposed so that its axis n coincides with the center n of the upper and lower platens 4 and 5, and the axis n
Has a cylindrical shape in which a conductive wire is spirally wound around the center. Although not shown, a frequency adjuster is connected to the induction coil 6 to supply an alternating current at an arbitrary frequency. The induction coil 6 may be cylindrical as long as the object to be heated 10 can be disposed inside the induction coil 6.
It is preferable to adopt one that matches the outer diameter of 0. The inner diameter may have a size that allows the upper platen 4 to penetrate.

The induction coil elevating means 8A is a fluid pressure cylinder having a cylinder portion fixed to the press frame 2, and the induction coil 6A is attached to the tip of a rod which extends downward.
Are connected via an insulator. As the fluid pressure cylinder 8 used for the induction coil lifting / lowering means 8A, an appropriate one such as pneumatic pressure or hydraulic pressure can be used.

The induction coil lifting / lowering means 8B is a winch fixed to the upper surface of the press frame 2, and the induction coil 6 is connected to the tip of the wire via an insulator. It is preferable that each of the plurality of wires is suspended from a pulley provided on the press frame 2 and wound up and down by one hoisting device.

In addition, as the induction coil lifting / lowering means, a screw mechanism including a ball screw mechanism, a combination of a linear gear (rack) and a gear (pinion), which has conventionally been used as a lifting / lowering means or a slide means, etc. Can be used as appropriate.

The vibration isolating member 9 is inserted between the induction coil 6 and a table on which the induction coil 6 is mounted (the mounting table 21 in the example of FIG. 1, but the lower platen 5 in the example of FIG. 5). So that it is attached to the lower surface of the induction coil 6. The vibration isolating member 9
As shown in FIG. 2, an arc-shaped vertical plate 9b is erected on the outer edge of a sector-shaped lower plate 9a conforming to the outer shape of the induction coil 6, and elasticity and elasticity are provided inside the lower plate 9a and the vertical plate 9b, respectively. It is formed by sticking a rubber piece 9c having electrical insulation. The anti-vibration member 9 absorbs vibration of the induction coil 6 during energization, and electrically insulates the induction coil 6 from the mounting table 21 (or the lower platen 5). By insulation
Since the magnetic field generated by the induction coil 6 is concentrated on the object to be heated 10, the heating efficiency is improved.

The object to be heated 10 can be subjected to electromagnetic induction heating by the induction coil 6, and includes a magnetic material such as a metal or a magnetic material. That is, a magnetic body such as a metal is formed from a conductive material, and when placed in an environment where the magnetic flux changes, an eddy current is generated inside and heat is generated.

FIGS. 3 and 4 show an example of the object to be heated.

The object to be heated 10 shown in FIG.
A laminated body formed by alternately stacking 1, 12, 13 and the rubber 14 while maintaining the parallel state is housed in the mold 15. This laminate is used as a seismic isolation rubber for buildings and the like, and the unvulcanized rubber can be vulcanized by the heating device 1.

In FIG. 3, a metal plate 11 is buried in rubber 14 and metal plates 12 and 13 are located at both ends in the vertical direction and one surface is completely exposed from the rubber. The outer edge protrudes from the rubber 14 to form a flange portion in which a bolt hole or the like can be formed. Metal plate 11 and rubber 1
Reference numerals 4 each have a thickness of several millimeters, and several to several tens of sheets are alternately stacked. The metal plates 12, 13 are functionally thicker than the internal metal plate 11,
Is used to increase the rigidity of the rubber 14 in the laminating direction when it is used as a seismic isolation rubber. Metal plates 11, 12,
13 serves as a heating medium by electromagnetic induction during heating. When the metal plates 11, 12, 13 generate heat,
The rubber 14 in contact therewith is heated by heat conduction from the metal plates 11, 12, 13. Examples of the metal plates 11, 12, 13 include iron, steel plates such as stainless steel having good corrosion resistance, aluminum, aluminum alloys, copper, and copper alloys, in addition to iron.

The mold 15 accommodates the laminate and can restrain at least the radial direction of the laminate. Although not shown, the height of the storage portion of the mold 15 is adjusted to the height of the laminated body after vulcanization, and is shorter than the height of the laminated body before vulcanization by the amount of pressurization. The induction coil 6 surrounds the outer periphery of the mold 15.

The object to be heated 10 shown in FIG. 4 is a laminate composed of wood such as laminated wood, plywood, a plurality of plate members 16, and a metal plate 17. The plate member 16 can be in close contact with the flat metal plate 17, and is pressed and formed at a high temperature to be formed and bonded. A sheet material 18 such as a cosmetic material is provided on the surface of the plate material 16.
Some are affixed. The metal plate 17 is a flat plate, has a length and width slightly larger than the plate 16, and has a size capable of completely covering two surfaces orthogonal to the laminating direction of the plate 16. Further, a ferromagnetic material such as iron or ordinary steel plate is preferable from the viewpoint of being easily affected by magnetic flux. In addition, the plate member 16 is often a square plate, and the metal plate 17 and the induction coil 6 surrounding the metal plate 17 are preferably square plates and square tubes, but are not limited thereto. Circles or polygons are also possible.

Next, another embodiment of the heating apparatus of the present invention will be described with reference to FIG. The induction coil lifting / lowering means 8C shown in FIG. 5 retreats the induction coil 6 from the surrounding position indicated by the solid line to the position indicated by the two-dot chain line below. In FIG.
The shape and size of the lower platen 5 are smaller than the inner diameter of the induction coil 6, and the induction coil 6 is fixed to the induction coil support plate 26 via the vibration isolating member 9. The support plate 26 has a ring shape, and the object to be heated 10 and the lower platen 5 can pass through inner holes. On the lower surface of the induction coil supporting plate 26, a rod 28a of a fluid pressure cylinder 28 having a cylinder portion fixed below the press frame 2.
Are connected.

[0029]

As described above, according to the first to third aspects of the present invention, the induction coil can be retracted below or above the upper and lower platens. Therefore, the induction coil can be retracted while the object to be heated is sandwiched between the upper and lower platens, and the state of the object to be heated during pressurization and heating can be visually checked. In the vulcanization of rubber, the appearance of burrs flowing out of the mold can be seen. Also, the wiring and piping of the induction coil can be simplified. further,
It is easy to align the induction coil with the object to be heated, and the center line in the height direction of the object to be heated coincides with the center line in the vertical direction of the induction coil, and the distribution of the magnetic force lines is vertically symmetric. So that a uniform temperature distribution can be obtained inside the object to be heated.

[Brief description of the drawings]

FIG. 1 is an explanatory view of one embodiment of a heating device of the present invention and another embodiment.

FIG. 2 is an explanatory view of a vibration isolating member of the heating device of FIG.

FIG. 3 is a diagram illustrating an example of an object to be heated.

FIG. 4 is a diagram showing another example of an object to be heated.

FIG. 5 is an explanatory view of still another embodiment of the heating device of the present invention.

FIG. 6 is an explanatory diagram of a conventional heating device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heating device 2 Press frame 4 Upper platen 5 Lower platen 6 Induction coil 7 Upper platen raising / lowering means 8A, 8B, 8C Induction coil raising / lowering means 9 Vibration-proof member 10 Heated object

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hirohiko Fukumoto 1-5-5 Takatsukadai, Nishi-ku, Kobe City, Hyogo Prefecture Inside Kobe Research Institute, Kobe Steel Co., Ltd. 2-3-1 in Kobe Steel, Ltd. Takasago Works

Claims (3)

[Claims] 1. An induction coil surrounding an outer periphery of an object to be heated is disposed between upper and lower platens, and while the object to be heated in the induction coil is pressurized through the upper and lower platens, the induction coil is energized and electromagnetically applied. A heating device for performing induction heating,
The induction coil is configured to be able to retreat by penetrating an upper platen or a lower platen upward or downward from a position surrounding the object to be heated between the upper and lower platens, and retreat the induction coil. A heating device provided with a lifting device for moving the heating device. 2. A pair of platens for sandwiching an object to be heated from above and below, platen elevating means for raising and lowering at least one of the platens with respect to the other platen, and heating the platen via the platen. Heating means for applying pressure to the object, an induction coil surrounding the outer periphery of the object to be heated by electromagnetic induction, and induction coil elevating means for elevating the induction coil. apparatus. 3. The induction coil according to claim 1, wherein the inner diameter of the induction coil is larger than the outer diameter of one of the pair of platens, and the induction coil elevating means adjusts the outer diameter smaller than the inner diameter of the induction coil. The heating device according to claim 2, wherein the induction coil is moved to at least a height of the object to be heated to a platen side of the heating device.