JP2016066422A - Induction heating device, and construction structure for construction/civil engineering sheet employing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an induction heating device capable of accurately aligning a heating coil of the induction heating device and an object to be heated, and a construction structure for a construction/civil engineering sheet employing the same.SOLUTION: The induction heating device is configured to join the construction/civil engineering sheet that is laid over a foundation and the object to be heated that is fixed on the foundation by heating the object to be heated. The induction heating device for fixing the construction/civil engineering sheet includes a magnetic field generation part including the heating coil that performs induction heating on the object to be heated, and a detection part including a sensor coil for detecting the object to be heated, over a surface of the construction/civil engineering sheet. The construction structure for the construction/civil engineering sheet employing the same is also disclosed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an induction heating device for fixing a sheet for building / civil engineering and a construction structure for a sheet for building / civil engineering using the induction heating device.

  Conventionally, construction and civil engineering sheets have been laid in waterproof structures such as rooftops and outer walls, tunnels, and waterproof structures in waste disposal sites. As a method of fixing this building / civil engineering sheet to the groundwork, a heated body made of a steel plate coated with a thermoplastic resin or hot melt adhesive is fixed in advance to the groundwork, and from above to the groundwork for construction / civil engineering There is a construction method in which a sheet is laid and the object to be heated is heated by an induction heating device from above the sheet for building and civil engineering, and the object to be heated and the sheet for architectural and civil engineering are fixed.

The induction heating device incorporates a magnetic field generation circuit including a heating coil. When the heating coil approaches a heated object, which is usually made of metal, an eddy current flows through the heated object, which is a metal, due to electromagnetic induction. Fever. At this time, the thermoplastic resin or hot melt adhesive coated on the surface of the object to be heated is heated and melted and bonded to the building / civil engineering sheet, whereby the building / civil engineering sheet is fixed.
In this construction method, it is important to match the heating coil of the induction heating device with the upper position of the object to be heated, but the heating object under the sheet that is hidden and not visible and the heating coil of the induction heating apparatus that is on the sheet It is difficult to match. However, if this position is shifted, the heat generation of the heated body is biased and the joining with the building / civil engineering sheet becomes insufficient, and the fixing strength between the sheet and the heated body is lowered.

  Thus, as a method of accurately arranging the electromagnetic induction heating device on the fixture from the surface of the building / civil engineering sheet, Patent Document 1 has a thickness substantially corresponding to the fixing member in the construction of the waterproof sheet. A joint positioning jig provided with a joint positioning guide hole that is larger than the outer periphery of the fixed member and smaller than the outer periphery of the high-frequency oscillation head in the middle of the non-conductive plate body is waterproof so that the guide hole matches the fixed member A method of laying a waterproof sheet is disclosed in which a high-frequency oscillation head is brought into contact with a guide hole and placed in contact with a guide hole, and then a fixing member and the waterproof sheet are joined by high-frequency induction heating.

JP 2001-123593 A

  However, the fixing member cannot be visually recognized because it is covered with the waterproof sheet. Therefore, the position of the fixing member is confirmed using a positioning jig, relying on the substantially arc-shaped pattern of the waterproof sheet that slightly swells depending on the thickness of the fixing member, and the exact position of the fixing member is detected from the top of the waterproof sheet. It is not easy to do. Further, even if the position of the fixing member can be accurately grasped by the positioning jig, the positioning jig moves when the high-frequency oscillation head is brought into contact with the guide hole so that the positions of the fixing member and the high-frequency oscillation head can be changed. There was a possibility of shifting.

  The present invention has been made in view of the above-described problems, and an induction heating apparatus capable of accurately aligning a heating coil of an induction heating apparatus and a body to be heated, and a building / civil engineering sheet using the induction heating apparatus. Provide construction structure.

The present invention is an induction heating apparatus for joining a heated object to a building / civil engineering sheet laid on the ground by heating the heated object fixed on the ground, the heated object A building / civil engineering sheet comprising: a magnetic field generating unit including a heating coil for induction heating a body; and a detection unit including a sensor coil for detecting the heated object from above the building / civil engineering sheet. It is an induction heating device for fixing.
The detection unit may further include a sine wave oscillation circuit for causing a current to flow through the sensor coil, and an inductance measurement circuit for measuring an inductance change of the sensor coil, and the inductance measurement circuit includes a phase. A detection circuit may be further provided, and the object to be heated is made of stainless steel, and the detection unit may selectively detect the object to be heated. Furthermore, the sensor coil may be formed of a resistance wire, and the resistance temperature coefficient of the resistance wire may be within a range of ± 10 × 10 ⁻⁵ / ° C.

  In the construction structure of the present invention, an object to be heated is fixed on the base, and a sheet for building / civil engineering is laid on the base and the object to be heated. The heated body is detected from above the building / civil engineering sheet, the heating coil is aligned with the corresponding position of the heated body, and the heated body is heated by induction heating. And the construction / civil engineering sheet, wherein the construction / civil engineering sheet is joined.

  A magnetic field generator including a heating coil for induction heating the object to be heated by an induction heating device for fixing the sheet for building and civil engineering; and a detection unit including a sensor coil for detecting the object to be heated from above the sheet for building and civil engineering; By providing the above, it is possible to accurately align the heating coil of the induction heating device and the object to be heated. The detection unit further includes a sine wave oscillation circuit for causing a current to flow through the sensor coil and an inductance measurement circuit for measuring the inductance change of the sensor coil, thereby making it less susceptible to the influence of conductive materials other than the object to be heated. The detection sensitivity of the object to be heated is improved and more accurate positioning can be performed. Further, since the inductance measurement circuit further includes a phase detection circuit, an error due to the resistance component of the sensor coil can be canceled, so that the detection sensitivity is improved and more accurate alignment is possible.

When the object to be heated is made of stainless steel, it is difficult to rust and has excellent durability, so that it can maintain the fixing strength of the building / civil engineering sheet for a long period of time. Therefore, even if an aluminum sheet or the like is laid, the object to be heated can be selectively detected by the detection unit of the induction heating device.

In addition, the sensor coil is formed of a resistance wire, so that it is possible to prevent malfunction of the sensor due to the temperature rise of the apparatus when the induction heating of the object to be heated is repeatedly performed by the induction heating apparatus. In addition, when the resistance temperature coefficient of the resistance wire is within the range of ± 10 × 10 ⁻⁵ / ° C., the induction heating device improves the effect of preventing malfunction of this sensor.
And the construction structure which has sufficient joint strength by detecting the object to be heated using the induction heating device for fixing the sheet for building / civil engineering as described above, and joining the sheet for architectural / civil engineering to the object to be heated. Can be obtained.

It is a block diagram which shows the structure of the induction heating apparatus of this invention. It is a block diagram which shows the structure of the detection part of the induction heating apparatus of this invention. It is sectional drawing which shows the construction structure of the sheet | seat for construction and civil engineering using the induction heating apparatus of this invention. It is sectional drawing which shows the example of arrangement | positioning of the principal part of the induction heating apparatus bottom part of this invention. It is the top view which showed the example of arrangement | positioning of the sensor coil of the induction heating apparatus of this invention. It is a schematic diagram which shows an example of the external appearance of the induction heating apparatus of this invention. It is sectional drawing which shows the construction structure of the sheet | seat for construction and civil engineering using the induction heating apparatus of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited to the following embodiment.

FIG. 1 shows an outline of the configuration of the induction heating apparatus. The induction heating apparatus according to the present embodiment detects the power source unit 5, the magnetic field generation unit 2 for heating the object to be heated by induction heating, and aligns the induction heating apparatus and the object to be heated by detecting the object to be heated. The detection part 3 for this and the control part 4 which controls these are comprised.
At least the magnetic field generator 2 and the detector 3 are integrally incorporated in the apparatus main body 1 of the induction heating apparatus. By adopting such a configuration, it is possible to prevent positional displacement because induction heating can be performed without moving the apparatus main body 1 after detecting the object to be heated by the detection unit 3 and performing alignment. Moreover, since it is an integrated type, the apparatus can be easily moved and the workability is good.

The magnetic field generator 2 constituting the induction heating device of the present embodiment is the same as a general induction heating device, and includes a heating coil 2-1 and an induction heating oscillation circuit 2-2. The induction heating oscillation circuit 2-2 is controlled by the control unit 4 so that a current can be passed through the heating coil 2-1 only when the detection unit 3 detects the object to be heated. When the signal is sent to the control unit 4, the control unit 4 controls the induction oscillation heating circuit of the magnetic field generation unit 2 to be in a state where induction heating oscillation is possible. In this state, the operator oscillates by performing an oscillation operation. .

  As shown in FIG. 1, the detection unit 3 constituting the induction heating device of the present embodiment includes a sensor coil 3-1, a sine wave oscillation circuit 3-2 for passing a current through the sensor coil 3-1, and a sensor coil. It includes an inductance measurement circuit 3-3 that measures the inductance of 3-1, and a comparison detection circuit 3-4 that detects the object to be heated by comparing the measured value of the inductance with the blank value. Here, the blank value is a measured value of the inductance of the sensor coil 3-1 in a place where there is no object to be heated.

  In a state where a current is passed through the sensor coil 3-1 through the sine wave oscillation circuit 3-2, the inductance measurement circuit 3-3 is in a state where the inductance of the sensor coil 3-1 is always measured. Since the inductance changes when the sensor coil 3-1 approaches the heated object, the comparison detection circuit 3-4 detects it and transmits a detection signal to the control unit 4. When a detection signal is sent from the comparison detection circuit 3-4 to the control unit 4, the control unit 4 controls the induction heating oscillation circuit 2-2 of the magnetic field generation unit 2 so that induction heating oscillation is possible. Thus, it is possible to prevent the induction heating from being oscillated in a state where the heating coil 2-1 is displaced from the position corresponding to the heated object. In addition, when performing induction heating oscillation, it is preferable to control the energization from the sine wave oscillation circuit 3-2 to the sensor coil 3-1 to prevent malfunction and failure of the sensor coil 3-1. .

  Various coils can be used as the sensor coil 3-1. Among these, an air-core coil is preferably used because of its high power resistance and easy confirmation of minute inductance changes. A single-layer coil (coiled in a spiral shape on a plane) is preferably used rather than a multilayer.

  A general magnet wire can be used for the electric wire used for the sensor coil 3-1. Examples of types of magnet wires include conductive wires made of conductors such as copper, aluminum, silver, copper-coated steel wires, and stainless steel, and resistance wires such as nichrome wires, iron chrome wires, copper nickel wires, manganin wires, and nickel wires, In addition, there are conductors and resistance wires whose surfaces are covered with an insulator such as polyurethane or polyester.

Since the induction heating device of this embodiment is an integrated type in which the magnetic field generation unit 2 including the heating coil 2-1 and the detection unit 3 including the sensor coil 3-1 are incorporated in the apparatus main body 1, the heating coil 2- The apparatus main body 1 may also become high temperature due to heat conduction from the heated object when the heated object is heated by 1, and this affects the inductance measurement of the sensor coil 3-1 and the detection unit 3 functions. There is a possibility that it will not. Therefore, it is desirable to use a sensor coil 3-1, which is not easily affected by temperature changes, and an example of such a magnet wire is a resistance wire. Of these, nichrome wire, iron chrome wire, copper nickel wire, and manganin wire are preferable because of their low temperature coefficient of resistance. In addition, copper nickel wire (advance wire, constantan wire) and manganin wire have relatively small specific resistance, excellent detection sensitivity of the heated object, and a low temperature coefficient of resistance of ± 10 × 10 ^-5 / ° C. This is preferable because it can be surely prevented.

In FIG. 3, the construction example of the sheet | seat for construction and civil engineering by the induction heating apparatus of this invention is shown. A heated object C coated with a thermoplastic resin or the like is fixed to the surface of a metal plate such as a disk-like or flat plate steel plate with a screw D on the base A, and a construction / civil engineering sheet B is laid thereon, and induction heating is performed. Induction heating is performed in a state where the apparatus E is placed at a position corresponding to the heated body C, and the heated body C is heated to fix the building / civil engineering sheet B to the heated body C.
That is, the position of the heated object C is detected by the induction heating device E in a state where the heated object C is covered and hidden by the construction / civil engineering sheet B, and the heating coil 2-1 of the induction heating device E is positioned at a position corresponding to the heated object C. Positioning is performed using the sensor coil 3-1 so that the object to be heated is detected at a plurality of locations when positioning with a plurality of sensors is performed rather than with a single sensor. Position determination is easy and more accurate alignment is possible. For example, a plurality of sensor coils 3-1 are arranged in conformity with the surrounding shape of the heated object C, and when all the sensors detect the heated object, it is determined that the alignment has been completed. As described above, a plurality of sensor coils 3-1 are preferably provided in the apparatus main body 1 of the induction heating apparatus E.

  The object to be heated is detected by measuring the inductance of the sensor coil 3-1 in the inductance measurement circuit 3-3 of the detection unit 3 and determining the numerical change in the comparison detection circuit 3-4. As this principle, first, when an alternating current such as a sine wave is passed through the sensor coil 3-1, a magnetic field is generated in the coil. When the sensor coil 3-1 is brought close to a non-magnetic metal such as aluminum in this state, an eddy current flows on the metal side to generate a magnetic flux in the opposite direction to the sensor coil 3-1, and the magnetic flux is canceled and the coil is moved. The number of magnetic flux penetrating decreases. As a result, the inductance of the sensor coil 3-1 decreases in principle. At this time, the decrease in inductance is a slight change, and in practice, the inductance is often almost unchanged. Further, when the sensor coil 3-1 is brought close to a magnetic material such as ferrite, for example, the number of magnetic fluxes penetrating the sensor coil 3-1 increases due to an increase in the number of magnetic fluxes inside the magnetic material, so that the inductance of the sensor coil 3-1 increases. Will be.

  As the object to be heated, a stainless steel material is preferably used from the viewpoint of strength and corrosion resistance. The types of stainless steel include austenite, ferrite, austenite / ferrite two-phase, and martensite. Among these, by using magnetic stainless steel as the heated object, for example, even when an aluminum sheet or the like is laid on the ground, the heated object can be selectively detected by the induction heating device of the present embodiment. Among these, it is particularly preferable to use a heated body made of ferrite, austenite / ferrite two-phase, or martensitic stainless.

  An ordinary LCR measuring device or the like can be used as the inductance measuring circuit 3-3, but the inductance measuring circuit 3-3 preferably includes a phase detection circuit as shown in FIG. By having a phase detection circuit, it is possible to eliminate measurement errors caused by the effect of the resistance of the sensor coil 3-1, so that highly sensitive measurement is possible, and the object to be heated can be reliably attached even from the top of the building / civil engineering sheet. Can be detected.

FIG. 4 is a cross-sectional view showing the arrangement of the main components of the bottom 8 of the induction heating device. Arranged at the bottom of each figure is a pad 7 made of urethane, silicon, or the like that is in contact with the building / civil engineering sheet during induction heating. The pad 7 causes the building / civil engineering sheet and the object to be heated to adhere to each other by induction heating while pressing the object to be heated from above the building / civil engineering sheet. A protective material 6 for protecting the heating coil 2-1 or the sensor coil 3-1 is disposed on the pad 7, and in FIG. 4 (4a), the heating coil 2-1 and the sensor coil 3- In FIG. 4 (4b), the sensor coil 3-1 and the heating coil 2-1 are arranged in this order.

When the sensor coil 3-1 is arranged on the heating coil 2-1 as shown in FIG. 4 (4a), the sensor coil 3-1 is further away from the heated body. A large sensor coil 3-1 is required. On the other hand, when the heating coil 2-1 is arranged on the sensor coil 3-1 as shown in FIG. 4 (4b), the distance between the sensor coil 3-1 and the heated object is short, and therefore FIG. Compared to 4a), it becomes easier to detect the heated object, which is preferable. However, when the distance between the sensor coil 3-1 and the object to be heated becomes short, heat generated when the object to be heated is induction-heated is easily transmitted to the sensor coil 3-1, and the temperature of the sensor coil 3-1 increases. May cause malfunction. For this reason, as described above, it is effective to select the type of the wire of the sensor coil 3-1 that is not easily affected by the temperature change.

  The heating coil 2-1 is preferably one that uniformly heats the heated body, and preferably has a slightly larger diameter than the heated body. The arrangement of the heating coil 2-1 is preferably arranged at the center when viewed from the upper part of the apparatus.

Further, in order to uniformly heat the heated body, the position of the heating coil 2-1 is aligned with the position corresponding to the heated body, that is, the center of the heated body and the center of the heating coil 2-1 coincide. It is important to align the positions, and therefore, a plurality of sensor coils 3-1 having a diameter smaller than that of the heating coil 2-1 are arranged so that the center of the sensor coil 3-1 is located near the outer periphery of the heated object. It is preferable that FIG. 5 is a plan view of an arrangement example of the sensor coil 3-1 as seen from the upper surface of the apparatus. A broken line C ′ in the figure indicates a portion corresponding to the outer periphery of the heated object, and the shape of the heated object in this case is a disk shape. For example, if the object to be heated is a disk, all the arrangement patterns (5a) to (5c) can be used, but the more the number of sensor coils 3-1 is more accurate as in (5c). The position of the object to be heated can be determined. However, in actuality, the number of sensor coils 3-1 provided is limited due to the sensitivity of the sensors and the influence of interference between the sensor coils 3-1, and the number of sensor coils 3-1 is 5 when the object to be heated is a disk. About 8 can be preferably used.

FIG. 6 shows the appearance of the induction heating apparatus of this embodiment. An LED 9a, which is a display unit 9 that informs that the sensor coil 3-1 has detected the object to be heated, is provided on the upper surface of the apparatus body 1 when the bottom 8 is on the lower side. The LED 9a is turned on when the sensor coil 3-1 detects the object to be heated, and the LED 9a is controlled to be turned off when it is not detected. As described above, when the display unit 9 is provided at a position that can be easily confirmed during work, alignment can be performed while confirming the display unit 9. Further, a buzzer sound for notifying the detection may be generated instead of the display unit 9, or these may be used in combination.

Six sensor coils 3-1 are attached to the apparatus main body 1 of FIG. 6, and six LEDs 9a corresponding to each sensor coil 3-1 are provided in the same manner as the actual arrangement direction of the sensor coils 3-1. It has been. When a plurality of sensor coils 3-1 are installed in this way, a plurality of display units 9 corresponding to each sensor coil 3-1 can be provided, and the plurality of display units 9 are further connected to the sensor coil 3-1. It is possible to confirm in which direction the heating coil 2-1 is displaced with respect to the object to be heated by providing it so as to indicate the actual arrangement direction, and positioning is facilitated. It can be shortened.

  Further, as shown in FIG. 6, an induction heating oscillation switch 10 is installed in the apparatus main body 1, and the operator confirms that the alignment between the heating coil 2-1 and the object to be heated has been completed on the display unit or the like and then induction heating. The induction heating can be oscillated by pressing the oscillation switch 10. The oscillation of the induction heating device is preferably controlled so that all the sensors provided in the device can oscillate after detecting the object to be heated. In this way, erroneous oscillation can be prevented. Further, a confirmation display such as an LED for notifying that the alignment has been completed may be separately provided on the apparatus main body 1, or the induction heating oscillation switch 10 itself may be lit to notify the oscillation possible state. Also, as shown in FIG. 6, it is preferable that the apparatus main body 1 is provided with a gripping portion 11 such as a handle because the apparatus main body 1 can be easily moved in alignment and continuous work.

The construction of the building / civil engineering sheet using the induction heating apparatus of the present embodiment will be described with reference to the example of FIG.
First, at a predetermined position on the base A on which the construction / civil engineering sheet B is to be constructed, a heated object C, which is a disk-shaped disk, is arranged at a predetermined interval and fixed to the base with screws D or the like. And the sheet | seat B for construction and civil engineering is laid on the base | substrate to which the to-be-heated body C was fixed.
Subsequently, the induction heating device E is placed on the construction / civil engineering sheet B on the base of the portion to which the heated object C is not fixed, and the induction heating device E is turned on. At this time, the detection unit 3 of the induction heating device E measures the inductance of the sensor coil 3-1 in a place where the heated object C is not present, and stores the measured value as a blank numerical value.

After that, while measuring the inductance of the sensor coil 3-1, the position of the induction heating device E is shifted in a state where it is placed on the construction / civil engineering sheet B, and a display unit or the like is detected. Confirm with. In the case of a device provided with a plurality of sensor coils 3-1 in the detection unit 3, for example, in the device provided with six sensor coils 3-1, three of the sensor coils 3-1 have detected the object C to be heated. In this case, the position of the induction heating device E is adjusted while confirming the direction of positional deviation on the display unit, and alignment is performed so that all the sensor coils 3-1 detect the heated object C.

When all the sensor coils 3-1 detect the object to be heated C and are in a state where induction heating oscillation is possible, the induction heating oscillation switch 9 is pressed to oscillate. The object to be heated is heated uniformly by induction heating, and the thermoplastic resin that covers the surface of the object to be heated is melted and brought into close contact with the sheet B for construction and civil engineering. Is done.
A series of operations are repeated, and the heated object C and the building / civil engineering sheet B are joined. When all the objects to be heated C and the building / civil engineering sheet B are joined, the construction is completed.

By using the induction heating device of the present invention, it is possible to accurately align the heating coil 2-1 and the heated object, and thereby obtain a construction structure for a building / civil engineering sheet having sufficient bonding strength. Can do.
In the construction structure of the present invention, the type of the foundation A is not particularly limited, and a concrete base such as a roof of a building such as a building or a tunnel, a metal base such as a metal roof, and a composite in which these bases are combined with a heat insulating material. Applicable to various groundwork such as groundwork. Further, as shown in FIG. 7, a structure in which an aluminum sheet F is laid on the base for the purpose of pinhole detection of the building / civil engineering sheet B may be employed.

  INDUSTRIAL APPLICABILITY The induction heating device of the present invention can be used for roofing waterproofing construction, waterproofing construction for tunnels, industrial waste facilities, etc., or construction and civil engineering sheet construction in interior construction.

DESCRIPTION OF SYMBOLS 1 Apparatus main body 2 Magnetic field generation part 2-1 Heating coil 2-2 Induction heating oscillation circuit 3 Detection part 3-1 Sensor coil 3-2 Sine wave oscillation circuit 3-3 Inductance measurement circuit 3-4 Comparison detection circuit 4 Control part 5 Power supply part 6 Protective material 7 Pad 8 Bottom part A Base B Construction / civil engineering sheet C Heated object D Screw E Induction heating device

Claims (7)

An induction heating device that joins a heated object to a building / construction civil engineering sheet laid on the ground by heating the heated object fixed on the ground,
A magnetic field generator including a heating coil for induction heating the object to be heated;
An induction heating device for fixing a sheet for building / civil engineering, comprising: a detection unit including a sensor coil for detecting the object to be heated from above the sheet for building / civil engineering.   The building / building apparatus according to claim 1, further comprising: a sine wave oscillation circuit for causing the detection unit to pass a current through the sensor coil; and an inductance measurement circuit for measuring an inductance change of the sensor coil. Induction heating device for fixing civil engineering sheets.   The induction heating apparatus for fixing a sheet for construction and civil engineering according to claim 1 or 2, wherein the inductance measurement circuit further includes a phase detection circuit.   The induction member for fixing a sheet for construction and civil engineering according to any one of claims 1 to 3, wherein the object to be heated is made of stainless steel, and the detection unit selectively detects the object to be heated. Heating device.   The induction heating device for fixing a sheet for construction and civil engineering according to any one of claims 1 to 4, wherein the sensor coil is formed of a resistance wire. 6. The induction heating apparatus for fixing a sheet for building and civil engineering according to claim 5, wherein a resistance temperature coefficient of the resistance wire is within a range of ± 10 × 10 ⁻⁵ / ° C. The heated object is fixed on the ground,
A sheet for construction and civil engineering is laid on the base and the heated object,
The said to-be-heated body is detected from the said sheet | seat for construction and civil engineering using the induction heating apparatus for sheet | seat fixation for construction and civil engineering as described in any one of Claims 1-6, and the said coil to be heated is said to be heated Align with the corresponding position on the body,
A construction structure for a construction / civil engineering sheet, wherein the to-be-heated body is heated by induction heating, and the to-be-heated body is joined to the construction / civil engineering sheet.

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