JPH1083884A - High frequency heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and accurately set a heating coil to a heating element. SOLUTION: A heating coil 22 is assembled into the frontal center of the head main body 23 of a welding head 13. The heating coil 22 is connected to a high frequency power supply via a resonance circuit. Four positioning sensors 25, for example, are provided around the heating coil 22. If either of the positioning sensors 25 coincides with the heating element, an indicator lamp corresponding to it is turned on. Then by moving the welding head 13 so that the indicator lamp is turned off, the heating coil can easily and accurately be set to the heating element.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used, for example, when heating an inductively heated body disposed on the back side of a waterproof sheet from the front side of the waterproof sheet and welding the waterproof sheet to the inductively heated body. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency heating device, and more particularly, to a high-frequency heating device that can accurately position a heating coil with respect to an induced heating body.

[0002]

2. Description of the Related Art In recent years, as a method for attaching a waterproof sheet to a primary lining of a tunnel, a method using a high-frequency heating device has been adopted.

FIGS. 7 and 8 show an example of this type of construction method. In the drawings, reference numeral 1 denotes a wall surface on which an incombustible cloth 2 is adhered, and the wall surface 1 has a predetermined arrangement. A plurality of disks 3 are mounted in a pattern.

As shown in FIG. 7, a heating element 4 made of a good conductor or a magnetic material that generates heat by electromagnetic induction is fixed on the surface of each of the disks 3, and the waterproof sheet 5 It is designed to be stretched inside the body 4. When the heating coil 7 to which the power from the high frequency power supply 6 is supplied approaches the disk 3, the waterproof sheet 5 is heat-welded to the disk 3.

In this type of construction method, the heating coil 7 needs to be directed to the disk 3 through the waterproof sheet 5, but the heating coil 7 must pass through the opaque waterproof sheet 5.
It is not easy to accurately align the disk on the disk 3.

Therefore, the present inventors first disclosed in Japanese Patent Laid-Open No.
As disclosed in Japanese Patent Application Laid-Open No. 11924, a method and apparatus for detecting an inductively heated body, which performs detection using a heating coil as a detection coil of a disk, have been proposed.

[0007]

SUMMARY OF THE INVENTION The method and apparatus for detecting an inductively heated object proposed by the present inventors previously detect the relative positional relationship between a disk and a heating coil or the presence or absence of a disk easily and accurately. It has many advantages, such as being able to.

However, when the displacement of the heating coil with respect to the disk is found, it is not always clear in which direction the heating coil is displaced, and the welding operation may be performed with the heating coil displaced relative to the disk. . In this case, only a part of the waterproof sheet is welded, resulting in insufficient strength. In the worst case, the waterproof sheet may drop or the like.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a high-frequency heating device capable of easily and accurately aligning a heating coil with a position of an induction-heated body.

Another object of the present invention is to provide a high-frequency heating apparatus capable of performing a positioning operation in a shorter time by using a heating coil as a detection coil to roughly detect the position of an induced heating object. To provide.

Another object of the present invention is to provide a high-frequency heating device capable of further improving workability.

Still another object of the present invention is to confirm the display mode of the display unit so that an operator can easily know in which direction the heating coil should be moved, and sufficient illumination can be provided. An object of the present invention is to provide a high-frequency heating device which does not hinder the operation at the site where it cannot be expected.

[0013]

According to the present invention, there is provided a high-frequency apparatus for heating an inductively heated body by a heating coil connected to a high-frequency power supply via a resonance circuit. In addition, a plurality of positioning sensors for detecting the approach of the inductively heated body are provided. Then, by detecting the position of the induced heating body by each of the positioning sensors, it becomes possible to easily and accurately position the heating coil on the guided heating body.

The present invention also provides a measuring circuit for measuring a change in electrical characteristics of a heating coil or a resonant circuit connected to the resonant circuit; a protection circuit for electrically disconnecting the measuring circuit from the resonant circuit; And a display means for displaying a measurement result by the above. This makes it possible to roughly detect the position of the induction-heated body using the heating coil as the detection coil, thereby making it easier to perform the positioning operation using the positioning sensor.

The present invention is also characterized in that the heating coil and the positioning sensor are incorporated in the welding head, respectively, and the welding head is provided with a display section of the positioning sensor. Thus, an operator who holds the welding head and performs an operation can check the display unit during the operation, thereby improving workability.

The present invention is further characterized in that the display section is constituted by a plurality of indicator lamps arranged in substantially the same arrangement pattern as each positioning sensor. Thus, by confirming the display mode of the display unit, the operator can easily know in which direction the heating coil should be moved, and work on site where sufficient illumination cannot be expected. At this time, there is no problem in the work.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 shows a high-frequency heating device according to one embodiment of the present invention. This high-frequency heating device 11 includes an apparatus main body 12 and a welding head 13,
The welding head 2 and the welding head 13 are connected to each other via a cord 14 having flexibility.

As shown in FIG. 2, the apparatus main body 12
A high-frequency oscillator 15 and a detection device 16 are provided. The high-frequency oscillator 15 includes a high-frequency power supply 17 and a resonance circuit 18. The detection device 16 is connected to the resonance circuit 18 via a protection circuit 19. It comprises a measuring circuit 20 and a display means 21 for displaying the measurement result of the measuring circuit 20.

The protection circuit 19, as shown in FIG.
For example, the protection circuit 19 is constituted by a switch operated by an electromagnetic relay or the like. The protection circuit 19 electrically disconnects the measurement circuit 20 from the resonance circuit 18 during the welding step, thereby preventing the measurement circuit 20 from being damaged. ing.

The measuring circuit 20 measures a change in electrical characteristics such as a change in impedance of a heating coil 22 incorporated in the welding head 13 described later, a change in impedance of the resonance circuit 18 or a change in resonance frequency. The measurement result is displayed on the display unit 21. Then, the worker uses the display means 2
By moving the welding head 13 while confirming the display contents of No. 1, the heating coil 22 and the heating element 4 of the disk 3 are moved.
, Or the presence or absence of the heating element 4 can be detected from the front surface side of the waterproof sheet 5.

On the other hand, as shown in FIG. 1, the welding head 13 comprises, for example, a thick disk-shaped head main body 23,
A handle 24 attached to the rear surface of the head main body 23 is provided. A heating coil 22 is attached to the center of the front surface of the head main body 23 as shown in FIG. For example, four positioning sensors 25 are attached to the peripheral portion of the casing 22 at equal intervals in the circumferential direction.

Each of the positioning sensors 25 is constituted by, for example, a capacitance type proximity switch.
When it matches, the presence of the heating element 4 can be detected. The detection result is displayed on a display unit 26 provided on the welding head 13.

As shown in FIG. 4, the display section 26 is composed of, for example, four display lights 27 disposed on the rear surface of the head body 23 of the welding head 13.
7 are arranged in the same arrangement pattern as each of the positioning sensors 25, and when an arbitrary positioning sensor 25 matches the heating element 4, the corresponding indicator lamp 27 is lit and displayed. Has become.

That is, as shown in FIG. 5, when the positioning sensor 25 at the upper end coincides with the heating element 4, only the indicator lamp 27 at the upper end of the display section 26 in FIG. From this state, the operator moved the welding head 13 in the direction of the lit indicator light 27, and as shown in FIG. 6, none of the alignment sensors 25 coincided with the heating element 4. In the state, all indicator lights 2
7 is turned off. When the worker confirms that the light is turned off, the heating coil 22 is turned off by the heating element 4.
It is easy to know that the position has been accurately adjusted.

The rear surface of the head body 23 is
As shown in (1), an oscillation indicator light 28, a cooling indicator light 29, an alarm indicator light 30, and a welding failure indicator light 31 are provided, respectively, so that an operator can easily confirm the contents thereof during the operation. .

Next, the operation of the present embodiment will be described. When detecting the heating element 4, the measurement circuit 20 and the resonance circuit 18 are electrically connected via the protection circuit 19, and then the heating coil 22 is checked while the display content of the display means 21 is checked.
Is moved along the surface of the waterproof sheet 5.

Since the high-frequency power supply 17 has a high impedance except during oscillation, the measuring circuit 20
Means that the characteristics of the parallel resonance circuit formed by the inductance of the heating coil 22 and the capacitor of the resonance circuit 18 are measured. Since this characteristic greatly changes depending on the presence or absence of the heating element 4 and the relative positional relationship between the heating coil 22 and the heating element 4, if the operation is performed while checking this change on the display content of the display means 21, The position of the heating element 4 can be easily detected by the heating coil 22.

The welding head 13 approaches the heating element 4 and, for example, as shown in FIG.
When 5 coincides with the heating element 4, the indicator lamp 27 at the upper end of the display unit 26 shown in FIG. Therefore, the operator moves the welding head 13 in the direction of the lit indicator light 27, that is, upward in FIG. Then, as shown in FIG. 6, all the alignment sensors 25 are
Does not match, and all the indicator lights 27 are turned off. The worker can confirm that the heating coil 22 has been accurately aligned with the heating element 4 by confirming that the light is turned off after the lighting.

The positioning sensor 25 detects the displacement between the heating coil 22 and the heating element 4 and detects the displacement of the indicator lamp 2.
Since the positioning is performed according to the display contents of 7, the positioning can be performed easily and accurately.

Further, since the presence / absence of the heating element 4 and the rough position detection are performed by using the detecting device 16, the positioning operation by the positioning sensor 25 can be performed.
It can be performed in a shorter time.

In the above-described embodiment, a case has been described in which the presence / absence of the heating element 4 and the approximate position of the heating element 4 are detected by the detection device 16. For example, an operator confirms the position of the heating element 4 by groping. In this case, the detection device 16 may be omitted.

In the above-described embodiment, the case where the four positioning sensors 25 are provided around the heating coil 22 has been described. However, the number is not particularly limited as long as it is plural. Also, the display unit 26 is not necessarily the indicator light 2
It is not necessary to configure the head 7, and for example, a direction in which the welding head 13 is moved may be indicated by an arrow. When it is difficult to attach the display unit 26 to the welding head 13, the display unit 26 may be provided at another position.

In the above-described embodiment, the case where the present invention is applied to the installation of the waterproof sheet on the primary lining of the tunnel has been described. The present invention can be widely applied to various operations using electromagnetic induction heating, such as installation of interior parts such as a roof, a wall, a door, and an instrument panel, as well as cap seals for food and medicine bottles.

[0034]

As described above, according to the present invention, a plurality of positioning sensors for detecting the approach of an inductively heated body are arranged around the heating coil. The position of the induction coil can be easily and accurately aligned with the induction heating element by detecting the position of the induction heating element with the sensor for use.

In the present invention, since the measuring circuit, the protection circuit, and the display means are provided respectively, it is possible to roughly detect the position of the induction heated body by using the heating coil as the detection coil. In addition, the positioning operation by the positioning sensor can be made easier.

In the present invention, the heating coil and the positioning sensor are incorporated in the welding head, respectively, and the welding head is provided with a display section of the positioning sensor. The operator can always check the display content of the display unit during the work, and the workability can be improved.

Further, in the present invention, the display section is constituted by a plurality of display lamps arranged in substantially the same arrangement pattern as each positioning sensor, so that the display mode of the display section can be confirmed. In addition, the operator can easily know in which direction the heating coil should be moved, and there is no hindrance to the operation even in the case of an on-site operation where sufficient illumination cannot be expected.

[Brief description of the drawings]

FIG. 1 is an external configuration diagram illustrating a high-frequency heating device according to an embodiment of the present invention.

FIG. 2 is a circuit diagram similar to FIG.

FIG. 3 is an explanatory diagram showing a configuration of a front surface of a head main body of the welding head.

FIG. 4 is an explanatory diagram showing a configuration of a rear surface of a head main body of the welding head.

FIG. 5 is an explanatory diagram showing a state in which a heating element is aligned with a positioning sensor at an upper end;

FIG. 6 is an explanatory diagram showing a state in which the heating element does not match any of the alignment sensors.

FIG. 7 is an explanatory diagram showing a method of attaching a waterproof sheet using a high-frequency heating device.

FIG. 8 is an explanatory diagram showing a relationship between a waterproof sheet and a disk.

[Explanation of symbols]

 REFERENCE SIGNS LIST 3 disk 4 heating element 5 waterproof sheet 11 high-frequency heating device 12 device main body 13 welding head 14 cord 15 high-frequency oscillator 16 detecting device 17 high-frequency power supply 18 resonance circuit 19 protection circuit 20 measuring circuit 21 display means 22 heating coil 23 head body 24 handle 25 Positioning sensor 26 Display 27 Indicator

Claims (4)

[Claims] 1. A high-frequency heating device that heats an induction-heated body by a heating coil connected to a high-frequency power supply via a resonance circuit, wherein a plurality of detection units detect proximity of the induction-heated body to a peripheral portion of the heating coil. A high-frequency heating device provided with a positioning sensor. 2. A measurement circuit connected to the resonance circuit for measuring a change in electrical characteristics of the heating coil or the resonance circuit; a protection circuit for electrically disconnecting the measurement circuit from the resonance circuit; and a measurement result by the measurement circuit. 2. A high-frequency heating apparatus according to claim 1, further comprising: display means for displaying the following. 3. The high-frequency device according to claim 1, wherein the heating coil and the positioning sensor are incorporated in a welding head, respectively, and the welding head includes a display unit of the positioning sensor. Heating equipment. 4. The high-frequency heating apparatus according to claim 3, wherein the display section is constituted by a plurality of indicator lights arranged in substantially the same arrangement pattern as each of the positioning sensors.