JPH06211203A - High frequency welding device - Google Patents

Abstract

PURPOSE:To reduce space requirement for installation of a device in comparison with a conventional rotary transfer type, by welding with heat a meterial transferred on a straight line, by a pair of high frequency induction heat-oil devices synchronously moved with the transfer. CONSTITUTION:When an open end of a container 22 or the like to be welded with heat, which is constituted by superposing aluminum foil and thermoplastic resin in turn, is welded with heat at the internal face of a core member, at first, a pair of high frequency induction heat coils 25 are positioned at the inlet side in the condition that the holding distance is opened to position so as to be opposite to the No.1-No.6 containers 22 or the like to be welded with heat. Next, the holding distance of heat coils 25 is closed to hold the weld parts of six containers 22. In this state, a pair of heat coils 25 are transferred in synchronization with the movement of containers 22. And at the same time, the heat-coils 25 start to weld the containers 22. After completion of welding, a pair of heat coils 25 are opened and transferred to the start position again to oppositely locate to the No. 7-No.12 containers 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welded material such as a laminated tube having an aluminum foil, a container made of paper or the like, and an inner surface of a core material of the container, on which an aluminum foil and a thermoplastic resin are sequentially laminated. The present invention relates to an improvement of a high-frequency welding device for welding the open end and the like of the above with a high-frequency induction heating coil.

[0002]

2. Description of the Related Art Generally, the open end of a cylindrical container such as a laminated tube is welded by a high frequency welding device. FIG. 8 is a side view of a generally used conventional high frequency welding device, and FIG. 9 is a plan view of a turntable portion of the high frequency welding device. Further, FIG. 10 is an explanatory diagram of each station of the high-frequency welding device, and FIG. 11 is an explanatory diagram of its wiring. Hereinafter, a conventional high-frequency melting apparatus will be described with reference to FIGS.

In the figure, reference numeral 1 denotes a turntable, and a pair of high frequency induction heating coils 2 are radially arranged on the lower surface side thereof. Reference numeral 3 denotes a tubular container for the object to be welded, the open end of which is the welding site. Reference numeral 4 denotes a sandwiching plate cam arranged in an arc shape. The turntable rotates, and the heating coil moving roller 5 corresponding to each high-frequency induction heating coil 2 is
When abutting against the sandwiching plate cam 4, the sandwiching interval of the pair of high frequency induction heating coils 2 is closed, and when the heating coil moving roller 5 is disengaged from the sandwiching plate cam 4, the pair of high frequency induction heating coils 2 is removed. It is designed so that it can hold two holding spaces.

Reference numeral 6 is a fixed high frequency induction coil, 7 is a moving high frequency relay induction coil, and a high frequency oscillator 8 (see FIG. 11).
When a high frequency is oscillated from the moving high frequency relay induction coil 7, when the moving high frequency relay induction coil 7 comes into a positional relationship just corresponding to the fixed high frequency induction coil 6, the high frequency induction heating coil 2 moves through the high frequency relay induction coil 7 for moving. Fixed high frequency induction coil 6
When the upper open end of the cylindrical container 3 which is the object to be welded is clamped by the pair of high frequency induction heating induction coils 2, the clamped portion is welded by heat. In addition, 9 is a rotating shaft, and by driving this, the turntable 1 is rotated. Further, 10 is a container mount, which holds the cylindrical container 3 vertically and can be raised and lowered by an elevating type drive unit 11. When the container mount 10 rises, the container mount 1
The upper open end of the cylindrical container 3 held at 0 is guided into the holding interval of the pair of high-frequency induction heating carps 2.

Next, 12 is an inlet star wheel, 13 is an outlet star wheel, 14 is a conveyor, and the cylindrical container 3 transferred along a straight line by the conveyor 14 is
As shown in FIG. 10, after being guided to the container mounting station I through the inlet star wheel 12 and the upper open end thereof is welded at the high frequency welding station II, the outlet star wheel 1 is passed through the container unloading station III.
3 and is again transferred to the transfer conveyor 14 for transfer. In addition, reference numeral 15 in the drawing denotes a safety cover.

[0006]

However, in the above-mentioned conventional technique, the cylindrical container 3 as the object to be welded, which is transferred in the linear direction by the conveyor 14, is transferred from the container mounting station 1 to the high frequency welding station II. After being transferred to the container unloading station III by a rotary method, it is again transferred in a linear direction by the transfer conveyor 14, so that an extra installation space for the device is required only for the portion required for the rotary transfer. There is a drawback that the structure becomes complicated in terms of the device.

Further, the cylindrical container 3 to be welded is mounted at the high-frequency welding station II at the time of conversion from the linear transfer by the conveyor 14 to the rotary transfer, and during the rotary transfer. When the platform 10 rises, the contents of the cylindrical container 3 in the unwelded state are given two impacts, which adversely affects the welding performance and causes variations in product quality. Was there.

Further, in the conventional high frequency welding apparatus which is welded during the rotary transfer, the high frequency induction heating coil 2 is used.
Is not directly heated by the high frequency oscillated from the high frequency oscillator 8, but is heated from the high frequency oscillator 8 via the fixed high frequency induction heating coil 6 and the moving high frequency relay induction coil. Not only the heat conversion efficiency is poor, but also the gap between the fixed high-frequency induction heating coil 6 and the moving high-frequency relay induction coil 7 is not constant, the high-frequency heat conversion efficiency becomes non-uniform and the welding performance becomes uneven. I was afraid. Further, in the conventional apparatus, since the high frequency induction heating coil 2 is radially mounted below the turntable 1, maintenance and inspection of the high frequency induction heating coil 2 and cleaning work are extremely troublesome.

The present invention has been proposed in view of the above-mentioned drawbacks of the prior art. The structure is simple, the installation space for the apparatus is small, and the impact on the contents of the cylindrical container in the unwelded state is small. In addition, it is intended to provide a high-frequency welding device which has good high-frequency heat conversion efficiency, can obtain uniform welding performance, and can be easily maintained and inspected and cleaned.

[0010]

In order to solve the above-mentioned problems, the present invention provides a carrier device for transferring a welded object along a straight line and an alignment for aligning the welded object transferred by the carrier device at a predetermined interval. The device, a pair of high-frequency induction heating coils for sandwiching and welding the aligned objects to be welded, and a pair of high-frequency induction heating coils, matching the transfer speed of the objects to be welded, after transferring a predetermined distance, A high-frequency welding device is characterized by comprising a coil reciprocating device for returning to the original position, and a coil interval opening / closing device for opening / closing a sandwiching interval of a pair of high-frequency induction heating coils. The high-frequency induction heating coil is long enough to hold multiple objects to be welded at the same time, and is configured to be directly connected to the high-frequency oscillator via a flexible feeder. It is an.

[0011]

Since the high-frequency welding device of the present invention is constructed as described above, the objects to be welded which are conveyed along a straight line by the conveying device are aligned by the aligning device, and the aligned objects to be welded are: By the coil reciprocating device, it is held by a pair of high-frequency induction heating coils that are transferred at the same time as the transfer speed of the object to be welded, and the holding interval is welded by closing the holding interval by the coil gap opening / closing device. It will be. When the welding is completed, the pair of high-frequency induction heating coils are held by the coil gap opening / closing device so that the coils can be held again and returned to their original positions by the coil reciprocating device, and the same operation is repeated.

When the pair of high-frequency induction heating coils have a length capable of simultaneously holding a plurality of objects to be welded, the distance over which the high-frequency induction heating coils move reciprocally, depending on the length. However, even if the length is increased to some extent, the flexible feeder connecting the high frequency induction heating coil and the high frequency oscillator allows the high frequency induction heating coil to move, so the high frequency induction heating coil is Directly heated by the high frequency oscillated from the high frequency oscillator, the object to be welded is efficiently and uniformly welded.

[0013]

EXAMPLES The present invention will be described in detail below with reference to the examples shown in FIGS. FIG. 1 is a side view of a high-frequency welding device according to an embodiment of the present invention when welding is started, and FIG. 2 is a plan view of the high-frequency welding device in that state. FIG. 3 is a side view of the high-frequency welding device at the end of welding.
FIG. 4 is a plan view of the high frequency welding device in that state. FIG. 5 is a sectional view of the high frequency welding device.
6 is a process explanatory diagram of the high frequency welding device shown in FIGS. 1 to 5, and FIG. 7 is a wiring explanatory diagram of the high frequency welding device.

In the figure, reference numeral 21 denotes a carrier for transferring the material to be welded 22 along a straight line.
A container mount 23 for mounting is mounted slidably on the transport device 21. Reference numeral 24 denotes an aligning device for aligning the welded matter 22 transferred by the carrying device 21 at a predetermined interval. A timing screw or the like is used, and the container mounting base 23 is in close contact with each other at the entrance side of the carrying device 21. Regardless of whether it is positioned or in a random state, the container mount 23 is sequentially slid on the transport device 21 as it moves, and the objects to be welded 22 are set at predetermined intervals. There is. Reference numeral 25 denotes a pair of high-frequency induction heating coils that sandwich and weld the objects to be welded 22. The high-frequency induction heating coil 25 and the high-frequency oscillator 26 are directly connected to each other via a flexible tube 27. The movement of the heating coil 25 is allowed.

In the present embodiment, the material to be welded 22
A laminated tube is used as the above, and the upper open ends of six laminated tubes can be welded at one time. Therefore, the length of the pair of high-frequency induction heating coils 25 is set so that the six laminated tubes can be held at the same time at the same time.
Is a pair of high-frequency induction heating coils that are configured to be divided in accordance with the corresponding objects to be welded 22 and that are electrically connected to each other and can substantially hold a plurality of objects to be welded 22 at the same time. 25 may be configured.

Next, 28 is a guide device for guiding the pair of high-frequency induction heating coils 25 so as to be movable along the transfer direction of the material to be welded 22, and the grooved cam 29 is used for the conveying device 2.
When driven by the motor 30 in synchronization with the driving of 1,
The lever 31 engaged with the grooved cam 29 swings, and the swinging of the lever 31 causes the pair of high-frequency induction heating coils 25 to be guided by the guide device 28 while the welded material 2
It is configured such that it is transported by a predetermined distance in synchronism with the moving speed of No. 2 and returned to the original position again.

Reference numeral 32 denotes a coil gap opening / closing device, which is a conveying device 2.
The high frequency induction heating coil 25 is driven by the motor 30 in synchronism with the driving of No. 1 and when the one high frequency induction heating coil 25 moves in the transfer direction of the welded material 22, the holding interval is closed, and conversely a pair of high frequency induction heating coils When 25 moves in the direction of returning to the original position, the timing is set by using a cam or the like so that the holding interval can be opened.

Next, the process of opening the high-frequency welding device of the present embodiment having the above-mentioned structure and welding the object to be welded such as a laminate tube will be described with reference to FIG. In the figure, (a) shows the process of high-frequency welding preparation start, the pair of high-frequency induction heating coils 25 are located on the inlet side in a state that the holding interval is open, and face the welded material 22 from No1 to No6. There is. Next, (B) shows the step of starting high-frequency welding, the pair of high-frequency induction heating coils 25, the holding interval is closed,
No. 1 to No. 6 welded portions of the object to be welded 22 are held, and in this state, the pair of high-frequency induction heating coils 25 also start moving in synchronization with the transfer of the object to be welded 22, and at the same time, the pair of high-frequency induction heating coils. Welding object 22 held by 25
Welding will be started.

Next, (c) shows the step of ending the high frequency welding, and the pair of high frequency induction heating coils 25 are located on the outlet side in a state where the holding interval is closed. Next, (d) shows a step of preparation for restarting high-frequency welding, in which the pair of high-frequency induction heating coils 25 are positioned on the outlet side, and the holding interval is opened.

Next, (e) shows a step in the process of moving to the high-frequency induction heating coil start position. The pair of high-frequency induction heating coils 25 return from the outlet side to the inlet side with the holding interval open. To do. Next, in (f), the pair of high-frequency induction heating coils 25 are completely restored, and similarly to (a), in the high-frequency welding preparation start step, at this time, the pair of high-frequency induction heating coils 25 are It is located on the entry side with the holding interval being open, and faces the objects to be welded 22 from No7 to No12.

The steps of (g) high frequency welding start,
(H) High-frequency welding end step, (re) high-frequency welding restart preparation step, (n) high-frequency induction heating coil starting position moving step, (l) high-frequency welding preparation start step, and a series of sequential steps By repeating the above, the material to be welded 22 is efficiently welded while being transferred along a straight line.

In FIG. 7, A shows a state where the high frequency induction heating coil is opened before welding, and B shows a state where the high frequency induction heating coil is closed during welding. However, the configuration of the transport device 21, the aligning device 24, the guide device 28, the grooved cam 29, the coil reciprocating device 33 composed of the motor 30, the lever 31, etc., and the coil gap opening / closing device 32 is the same as that of the illustrated embodiment. It is needless to say that the design is not limited to the above, and the design can be arbitrarily changed by various means that fulfill the function.

[0023]

As described above in detail, in the present invention, the object to be welded which is transferred in the linear direction is welded during the transfer without changing the transfer direction. Compared with the conventional one that requires a formula transfer,
The installation space for the device is small and the structure is simple. In addition, since the material to be welded does not impact the contents of the cylindrical container in the unwelded state due to the direction change during transfer or the like, the welded state is stable and there is no risk of quality variations. Further, since the high frequency induction heating coil is directly heated by the high frequency wave oscillated from the high frequency oscillator, the high frequency heat conversion efficiency is significantly improved and stabilized. Moreover, since the arrangement of the high frequency induction heating coil is simplified, it has many advantages such as easy maintenance and inspection work and cleaning work. It can be widely applied to the welding of various articles and is very convenient for practical use. A device can be provided.

[0024]

[Brief description of drawings]

FIG. 1 is a side view of a high-frequency welding device according to an embodiment of the present invention when welding is started.

FIG. 2 is a plan view of the high-frequency welding device in the state of FIG.

FIG. 3 is a side view of the high-frequency welding device after completion of welding.

FIG. 4 is a plan view of the high-frequency welding device in the state of FIG.

FIG. 5 is a sectional view of the high-frequency welding device.

FIG. 6 is a process explanatory view of the high-frequency welding device shown in FIGS.

FIG. 7 is a wiring diagram of the high-frequency welding device.

FIG. 8 is a side view of a commonly used conventional high-frequency welding device.

FIG. 9 is a plan view of a turntable portion of the conventional high-frequency welding device shown in FIG.

FIG. 10 is an explanatory diagram of each station of the conventional high-frequency welding device.

FIG. 11 is a wiring explanatory view of a conventional high frequency welding device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 turntable 2 high frequency induction heating coil 3 cylindrical container of the object to be welded 4 pinching plate cam 5 heating coil moving roller 6 fixed high frequency induction coil 7 moving high frequency relay induction coil 8 high frequency oscillator 9 rotating shaft 10 container mount 11 Elevator drive part 12 Entrance star wheel 13 Exit star wheel 14 Conveyor conveyor 15 Safety cover I Container mounting station II High frequency welding station III Container ejection station 21 Conveying device 22 Welding material 23 Container mounting table 24 Aligning device 25 High frequency induction heating coil 26 High frequency Oscillator 27 Flexible tube 28 Guide device 29 Groove cam 30 Motor 31 Lever 32 Coil gap opening / closing device 33 Coil reciprocating device

Claims (2)

[Claims] 1. A transport device for transporting a material to be welded along a straight line, an aligning device for aligning the material to be welded transported by the transport device at a predetermined interval, and holding and welding the aligned materials to be welded. A pair of high-frequency induction heating coils, a pair of high-frequency induction heating coils, and a coil reciprocating device that returns the original position after transferring a predetermined distance by adjusting the transfer speed and timing of the material to be welded, and a pair of high-frequency induction coils. A high-frequency welding device, comprising: a coil gap opening / closing device for opening / closing a holding interval of a heating coil. 2. The pair of high frequency induction heating coils have a length capable of simultaneously holding a plurality of objects to be welded, and are directly connected to the high frequency oscillator via a flexible feeder. 1. The high frequency welding device according to 1.