JP6550735B2 - High frequency induction heating device and film label sticking device - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a high frequency induction heating device and a film label sticking device, and in particular, a high frequency induction heating device and a film label sticking device having different patterns such as the number of turns and arrangement of a heating coil to be applied according to the type of a heated object. About.

  2. Description of the Related Art Conventionally, there is known an apparatus for attaching a film label on which a gravure printing or the like is applied to a can body outer peripheral surface of a two-piece can in which a can body and a can bottom are integrated.

  For example, Patent Document 1 discloses a device that fits and transports a two-piece can body to a cylindrical mandrel, and affixes a film label on the outer surface of the can body during the transportation. In FIG. 1, there is provided a mandrel rotating and conveying means for rotating an endless track while rotating mandrels arranged at equal pitches, and heating the cans being conveyed along the mandrel conveying path of the mandrel rotating and conveying means An apparatus is shown in which a can heating means, a film label sticking means for sticking a film label to a can during transportation, a can cooling means for forcedly cooling a can after film label sticking, etc. are arranged. .

JP 2001-179830 A

  By the way, in the apparatus of patent document 1, the high frequency induction heating apparatus which has arrange | positioned the heating coil to the both sides of the movement path | route of a mandrel is employ | adopted as a can body heating means, According to this high frequency induction heating apparatus, heating is carried out. The can can be heated in a noncontact manner by the induction heating action by the alternating magnetic field emitted by the coil.

However, in order to uniformly heat the entire circumference of the can body to a predetermined temperature suitable for attaching the film label, depending on the difference in the material and capacity of the can, the form of the can body, etc. The pattern of the number of turns and the arrangement of the heating coil is changed as appropriate, but the inductance of the heating coil varies accordingly.
For this reason, in a commercially available high frequency oscillation unit, since the high frequency current having a relatively narrow oscillation frequency band is output, the range of applicable inductance is limited, and when the inductance of the heating coil changes significantly, oscillation occurs. May become unstable or the oscillation may stop. Therefore, there is a problem that applicable heating coil patterns are limited, and high-frequency oscillation units corresponding to the inductances of the respective heating coils are required.
In addition, there is a problem that the high-frequency oscillation unit is increased in size to be applied to the inductance of each heating coil.

  The present invention has been proposed in order to solve the above-described problems. In changing the pattern of the heating coil in accordance with the difference in form such as the material and capacity of the can body and the thickness of the can body, the high frequency An object of the present invention is to provide a high frequency induction heating apparatus and a film label sticking apparatus that can satisfactorily perform induction heating of various cans having different forms while making the oscillation unit common.

The high-frequency induction heating device according to the present invention includes a high-frequency transmission unit that outputs a high-frequency current in a specific frequency band, a heating coil that induction-heats an object to be heated by the high-frequency current output from the high-frequency transmission unit, and the heating coil And a coil for adjustment that constitutes a resonant circuit, wherein the heating coil can be replaced by a heating coil that is pattern-designed according to the form of the object to be heated, and the coil for adjustment is a synthetic inductance of the resonant circuit adjust, to the resonance state and the oscillation frequency by tuning the high frequency oscillator unit and the resonant frequency of the resonant circuit, there as selected Ru configured in accordance with a combination of the heating coil is replaced.

  Moreover, the film label sticking apparatus which concerns on this invention has a several mandrel, the conveyance means which conveys the can inserted in the said mandrel, and the can which induction-heats the said can inserted in the said mandrel In the film label sticking apparatus comprising heating means and sticking means for sticking a film label to the can that is being transported on the downstream side of the can heating means, the can heating means is as described above. The configuration is a high-frequency induction heating device.

According to the present invention, induction heating of an object to be heated such as various can bodies having different forms such as the material and capacity of the can body and the thickness of the can body can be performed using a common high-frequency oscillation unit.
Therefore, space saving of the high frequency oscillator units, the cost can be reduced.

FIG. 1 is a schematic circuit diagram of a high frequency induction heating device according to an embodiment of the present invention. FIG. 2: shows the schematic of the high frequency induction heating apparatus which concerns on one Embodiment of this invention, (a) is a perspective view, (b) is AA sectional drawing. FIG. 3 is a schematic view of a film label sticking apparatus to which the high frequency induction heating apparatus according to an embodiment of the present invention is applied.

[High-frequency induction heating device]
Hereinafter, a high frequency induction heating device according to an embodiment of the present invention applied as a can heating means of a film label sticking device will be described.

As shown in FIG. 1, the high-frequency induction heating apparatus includes a high-frequency oscillation unit 2, a heating coil 3, and an adjustment coil 4.
The high frequency oscillation unit 2 includes a power supply unit 21, an oscillation unit 22, a matching transformer 23, and a resonance capacitor 24, and outputs a high frequency current from an output terminal.
The high-frequency current is an alternating current having an oscillation period of a specific frequency, and this alternating current flows through the heating coil 3 and the adjustment coil 4 connected to the output terminal of the high-frequency oscillation unit 2.

For example, as shown in FIG. 2, the heating coil 3 and the adjustment coil 4 are composed of a copper tube winding, and in order to suppress heat generation of the coil itself, a cooling medium ( Usually, cooling water) is circulated.
The heating coil 3 is housed in a ferrite case 30 formed in a substantially U-shaped cross section, for example, to prevent a magnetic field from leaking to the outside. In the case 30, the heating coil 3 extends in the right and left sides of the passing can body along the movement direction of the can body in the case 30, and crosses the moving path on the inlet side and the outlet side. It is rolled so that it straddles without. In addition, each stage of the winding wound in a plurality of stages is arranged at a predetermined interval (pitch) in the axial direction of the can body.
Although the case 30 shown in FIG. 2 is illustrated in a substantially rectangular parallelepiped shape, actually, as shown in FIG. 3, the case 30 has a curved shape along the conveyance direction of the can.

  A plurality of types of cases 30 having such heating coils 3 are prepared according to differences in forms such as the material and capacity of the can body and the thickness of the can body, and each case 30 has the number of turns of the heating coil 3. The arrangement is different. As a result, the inductance of the heating coil 3 is different for each type of case 30.

On the other hand, the adjustment coil 4 is disposed outside the case 30 in order to avoid mutual induction with the heating coil 3.
The adjustment coil 4 is connected in order to make different inductances of the plurality of heating coils 3 equal or acceptable, and the adjustment coil 4 is formed so as to be exchange-connectable by a copper pipe joint or the like. Moreover, the coil 4 for adjustment prepares multiple types as needed, matches the high frequency oscillation unit 2 according to the heating coil 3 with the largest inductance, The other heating coil 3 uses the adjustment coil 4 Increase inductance. Furthermore, the adjustment coil 4 is preferably housed in a ferrite case or the like in order to avoid leakage of the magnetic field to the periphery.
Such adjustment coil 4 is appropriately selected according to the combination with the heating coil 3.
In this combination, for example, the resonance frequency f of the resonance circuit composed of the heating coil 3, the adjustment coil 4 and the resonance capacitor 24 matches or approximates the frequency f _{0 of the} high-frequency current flowing from the high-frequency oscillation unit 2. It is selected as follows.

ただし、Ｌ_３、Ｌ_４は、加熱コイル３、調整用コイル４それぞれのインダクタンスを示し、式２は、これらが直列に接続されているときの関係を示している。 A resonance circuit constituted by the heating coil 3, the adjustment coil 4, and the resonance capacitor 24 has a specific resonance frequency f obtained based on these.
The resonance frequency f in this case, a combined inductance L ₃₄ of the heating coil 3 and the adjustment coil 4, the relationship between the capacitance c of the resonance capacitor 24 can be expressed by the following equation.

However, L _3, L ₄ is a heating coil 3, shows the adjustment coil 4 of each inductance, Equation 2 shows the relationship when they are connected in series.

From such a relational expression, the resonance frequency f coincides with the frequency f _{0 of the} high-frequency current (the center value when the frequency f ₀ has a range), or the resonance frequency f is a predetermined value centered on the frequency f ₀ . A combination of inductances L ₃ and L ₄ of the heating coil 3 and the adjustment coil 4 is determined so as to be a value within the range of the frequency band (for example, ± 20% of the frequency f ₀ ).

For example, when the combined inductance L ₃₄ determined by substituting the predetermined frequency f ₀ and the capacitance c into the equation (1) is 43 μH and the inductance L ₃ of the heating coil ₃ is 37 μH, the equation (2) Based on this, the adjustment coil 4 having an inductance L ₄ of 6 μH (= 43−37) can be selected.

Thus, number of turns, even when the arrangement and respectively connected to a plurality of types of heating coils 3 may differ by combining inductance L ₃₄ is selected adjustment coil 4 showing a constant value, the high-frequency oscillation of the resonant frequency f It can be made to coincide with or approximate to the frequency f _{0 of the} high frequency current flowing from the unit 2.
As a result, the resonance frequency f of the resonance circuit and the oscillation frequency f ₀ of the high-frequency oscillation unit 2 are synchronized to be in a resonance state, so that the can body is efficiently induction-heated by the heating coil 3. The high frequency induction heating apparatus 1 configured in this way can perform good induction heating of various cans different in material, capacity, thickness of the can body, etc. while achieving common use of the oscillation unit 2. It is applied as follows as can heating means in the film label sticking apparatus 100.

[Film label sticking device]
As shown in FIG. 3, the film label affixing apparatus 100 is a mandrel rotation conveyance which fits a two-piece can into a mandrel 10 and conveys it, and revolves an endless track while rotating the mandrels 10 arranged at equal pitches. Means 50, the high frequency induction heating device 1 for induction heating the can body being conveyed along the mandrel conveyance path 51 of the mandrel rotation conveyance means 50, the sticking roller 60 for adhering the film label to the can body being conveyed, etc. It has.
The film label sticking apparatus 100 having such a configuration operates as follows, and sticks the film label while heating the can body.

  The mandrel rotation conveying means 50 accepts the supply of the can body from the can body supply device 41 and attaches the accepted can body to the mandrel 10 at the position shown in FIG. The can mounted on the mandrel 10 revolves along the mandrel conveyance path 51 while rotating. In the section shown in (ii), as shown in FIG. 2, heating is performed by the heating coils 3 extending on the left and right sides along the moving direction of the can body 10. At this time, the can is heated from normal temperature to, for example, about 160.degree.

The film label is attached in the section shown in (iii). A sticking roller 60 is disposed in this section. The film label supplied from the film label supply device 70 is held on the peripheral surface of the sticking roller 60, and the held film label is wound and stuck on the can body while being pressed.
Thereafter, at the position shown in (iv), the can mounted on the mandrel 10 is discharged, and the discharged can is delivered to the can collection device 42, thereby completing the film label attaching process.

  By the way, such a film label affixing device 100 is generally used as a film label affixing device for affixing a film label to various cans having different forms such as material and capacity of cans and thickness of can barrels. Used. In this case, for example, when the material of the can changes (for example, when the can is changed from a steel can to an aluminum can), the impedance of the can also changes, so high frequency current of the same frequency is supplied to the same heating coil 3 When induction heating is performed on cans made of different materials, the temperature of the can will change too high, too low, etc., and the temperature will not be suitable for sticking film labels. Problems such as poor sticking will occur. Therefore, it is necessary to replace the heating coil 3 with a pattern designed according to the form of the can, but then, since the inductance of the heating coil 3 changes after replacement, the resonant frequency of the resonant circuit and the high frequency oscillation unit 2 There is a possibility that the oscillation frequency is not tuned and does not resonate.

In such a case, the inductance of the heating coil 3 before replacement (in this case, this inductance becomes the combined inductance L ₃₄ ) and the inductance L ₃ of the heating coil 3 after replacement are determined, and the combined inductance L ₃₄ (for example, , 43 μH) and an inductance L ₃ (eg, 37 μH) are substituted into Equation 2 and the adjustment coil 4 having an inductance L ₄ (eg, 6 μH) is connected to the resonant circuit (in this example, connected in series) . As a result, the combined inductance L ₃₄ before and after replacement has the same value, so that the resonance frequency of the resonance circuit can be matched with the oscillation frequency of the high-frequency oscillation unit 2. As a result, while using the same high-frequency oscillation unit 2, it is possible to replace the heating coil 3 with a pattern designed according to the shape of the can body. Since the temperature can be uniformly heated, equipment investment can be reduced.

  As described above, the high-frequency induction heating apparatus and the film label sticking apparatus of the present invention have been described with reference to preferred embodiments. However, the high-frequency induction heating apparatus and the film label sticking apparatus according to the present invention are limited only to the above-described embodiments. It goes without saying that various modifications can be made within the scope of the present invention.

  Further, in the present embodiment, although the two-piece can is used as the induction heating and the film label to be attached, a so-called three-piece can attached to a cylindrical can barrel by winding a can lid and a can bottom You can also

  INDUSTRIAL APPLICATION This invention can be utilized suitably for the high frequency induction heating apparatus which induction-heats the can body from which forms, such as a material, a capacity | capacitance, and the thickness of a can body differ, and a film label sticking apparatus provided with the same.

DESCRIPTION OF SYMBOLS 1 High frequency induction heating apparatus 2 High frequency oscillation unit 21 Power supply part
22 Oscillator
23 Matching transformer
24 Resonant capacitor
Reference Signs List 3 heating coil 30 case 4 adjustment coil 10 mandrel 50 mandrel rotating conveyance means 60 sticking roll 100 film label sticking apparatus

Claims (3)

A high frequency transmission unit that outputs a high frequency current of a specific frequency band;
A heating coil for inductively heating the object to be heated by the high-frequency current output from the high-frequency transmission unit;
An adjustment coil which constitutes a resonant circuit together with the heating coil;
With
The heating coil can be replaced with a heating coil whose pattern is designed according to the form of the object to be heated,
The adjustment coil adjusts the combined inductance of the resonance circuit, so that the resonance frequency of the resonance circuit and the oscillation frequency of the high frequency transmission unit are tuned to be in a resonance state, with the heating coil replaced. high-frequency induction heating apparatus according to claim Rukoto selected according to the combination. Conveying means for conveying a can having a plurality of mandrels, the can fitted to the mandrel, can heating means for inductively heating the can fitted to the mandrel, and downstream of the can heating means In the film label sticking device provided with sticking means for sticking the film label to the can during transportation,
The film label sticking apparatus, wherein the can heating means is the high-frequency induction heating apparatus according to claim 1.   The film label sticking apparatus according to claim 2, wherein the heating coil included in the can heating means can be replaced with a heating coil whose pattern is designed according to the form of the can.

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