JPH0673907B2 - High frequency welder - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention processes a cylindrical product such as a container bag shown in FIG. 7 by welding a thermoplastic material such as a vinyl chloride resin sheet material by dielectric heating. The present invention relates to a high frequency welder used for More specifically, the invention relates to a high-frequency welder that is convenient for processing the periphery or end of a tubular thermoplastic material.

[0002]

2. Description of the Related Art A high-frequency welder conventionally used for processing a cylindrical product is provided with a processing portion composed of an upper electrode and a lower electrode at a position protruding laterally from a main body frame. In principle, one high-frequency welder has one processing portion. For example, when processing both ends of a tubular material, each one is processed as a separate process.

In the processing by the high-frequency welder, a work for setting a work for positioning welding and a welding work by energization are performed. Therefore, the power supply device and the oscillating device are not always operating. For this reason, conventionally, a device having two processing parts, in which one power supply device and an oscillating device switch and supply currents to the electrodes of the respective processing parts, has been put into practical use. However, conventionally, even if it has two processing parts, it is usual that the two processing parts are provided back to back or arranged in parallel.

[0004]

When the conventional high-frequency welder is used to process both ends of a cylindrical work piece or two positions apart from each other, the work must be performed as a separate process. Further, even if one end is processed, it is difficult to handle the part other than the processed part. For example,
When processing the end of the cylindrical body, the part before the processing position hangs down in front of the electrode, and especially when the work piece is heavy, it can be pulled to fix the work piece in the correct position. There is a possibility that the welding position may be displaced as a result of being difficult or being pulled in one direction. Further, when the machining position is sequentially moved in the circumferential direction while machining a certain size, the work piece is twisted, resulting in poor workability. This is the same even if it has two processing parts.

An object of the present invention is to solve the above-mentioned drawbacks of the prior art, and to obtain a high-frequency welder which allows easy handling of a cylindrical workpiece and enables efficient work. Another object is to make it possible to easily change the welding pattern.

[0006]

SUMMARY OF THE INVENTION In the present invention, a pair of two processing portions for performing a welding process with an object to be processed interposed between an upper electrode and a lower electrode are arranged at opposing positions. The lower electrode in each processing portion is attached to the tip of the supporting rod protruding from the main body frame, and the supporting rod itself is rotatable. Then, a support member for supporting a part of the workpiece is provided in front of the upper and lower electrodes. At this time, the lower electrodes attached to the tips of the support rods are provided at different rotational positions.

The upper electrode facing the lower electrode may be switchable among a plurality of electrodes. Further, the support member of the workpiece is one that penetrates the support rod of the lower electrode and advances and retreats this shaft by a cylinder, and the support member may be rotatable with respect to the shaft.

[0008]

As will be understood from FIG. 4, when one end of the cylindrical work piece is set in the working portion to machine the end of the work piece, the tip of the work piece is supported by the support member. To be done.
At this time, the other end of the workpiece can be set on the facing processing portion. Then, for example, by alternately energizing the facing processing parts, rotating the workpiece while performing the welding processing in each processing part, and moving the welding position, twisting or slack may occur on the workpiece. Work will proceed without it.

When the welding pattern changes, the supporting rod of the lower electrode is rotated. Then, the lower electrode is switched inside the cylindrical workpiece without removing the workpiece. At this time, since the upper electrode is outside the workpiece, the upper electrode can be replaced freely, and the upper electrode can also be processed by a stationary die. However, if the upper electrode is also switchable, the welding pattern can be changed more easily.

[0010]

Embodiments of the high frequency welder of the present invention will be described below with reference to the accompanying drawings.

FIG. 7 shows an example of a tubular product processed by a high-frequency welder, which is called a container bag and is made of a relatively thick and durable soft vinyl chloride resin sheet material. This is mainly used for transporting powder and granules. Such a container bag is made by welding a bottom member B and a top member C to both ends of a body A that has been processed into a tubular shape in advance. A short cylindrical discharge port D is welded to the center of the bottom member B, and an inlet E is welded to the center of the top member C in advance. INDUSTRIAL APPLICABILITY The present invention is mainly suitable for processing the end portion of a tubular product such as welding of the body A to the bottom member B and the top member C in the processing of the container bag.

FIG. 1 is a front view of the entire high-frequency welder, which is composed of an upper electrode 1 and a lower electrode 2 respectively.
Two processing parts I and II are arranged at opposing positions in one main body frame 3 formed in a gate shape. The main body frame 3 is provided with one power source section and an oscillating section so that the electrodes to be energized can be switched between the processing section I and the processing section II according to the working situation. Upper electrode 1 of each processing part I, II
Is moved up and down by a cylinder 4 provided on the upper side of the gate-shaped main body frame 3, and the lower electrode 2 is arranged immediately below. The lower electrode 2 is fixed to the tip of a support rod 5 that protrudes horizontally from the body frame 3. The support rod 5 has a depth at the time of welding work, and has a length capable of supporting, for example, a top member and a bottom member of the container back.

As shown in FIG. 2, the lower electrode support rod 5 has a cylindrical shape, and its lower end is provided with two lower electrodes 2 at opposite positions.
I am wearing 2. The base end of the support rod 5 is supported by bearings 6 and 7 in the body frame so that it can be rotated and can be rotationally driven to an arbitrary position by a motor 8. Reference numeral 9 is a gear fixed to the support rod, and 10 is a drive gear. With this structure, the supporting rod 5 can be rotated by driving the motor 8 so that any desired lower electrode of the two lower electrodes 2 and 2 at the tip can be opposed to the upper electrode.

A shaft 11 is provided on the center line of the support rod 5 of the lower electrode so as to penetrate therethrough, and a tip of the support rod is projected from the support rod to mount a support member 12 for a workpiece at a position ahead of the lower electrode 2. The shaft 11 is supported by a guide cylinder 13 and can slide in the axial direction. The base end portion is fixed to the operating rod 4a of the rodless cylinder 14 so that the shaft 11 and the support member 12 can move forward and backward toward the lower electrode.

In the illustrated embodiment, the support member 12 of the workpiece is molded into a bag-like or blind cylinder having airtightness with a flexible rubber or synthetic resin material and can be expanded and contracted by intake and exhaust of compressed air. And That is, the shaft to which the support member 12 is attached
11, the pipe member is used as a ventilation pipe,
Compressed air is supplied through the flexible tube (15) at the base end to inflate the support member (12) attached to the tip end.

Details of the mounting structure of the support member 12 are shown in FIG. The shaft 11 using a pipe member is a support member 12
The support member 12 penetrating through the central part of the is attached airtightly. Then, the opening at the tip is closed by the plug 21, and the ventilation holes 16, 16 are opened at the position located inside the support member. As a result, compressed air is supplied from the shaft 11 through the ventilation hole 16 into the support member 12. Support member on shaft 11
To attach 12, ring members 19 and 20 are provided on the outer peripheral surface of the shaft 11 with bearings 17 and 18 interposed.
On the other hand, the central opening of the support member is fixed by the fixing metal fitting 22.
The ring member 20 located on the base of the shaft 11 is provided with a seal ring 23 between the ring member 20 and the shaft 11, and a ring member on the tip side.
A blind lid 24 covering the front end face is fixed to 19. As a result, the support member 12 is rotatable with respect to the shaft 11 and is hermetically mounted. Then, when compressed air is supplied through the shaft 11, the support member 12 expands like a wind fan, and contracts a little when forcedly exhausted by a suction blower. At this time, the support member 12 is preferably folded so as to be contracted.

A process of processing the container bag shown in FIG. 7 by the high frequency welder of the above embodiment will be described. First, the support member 12 is retracted in a contracted state, the discharge port D and the input port E are passed through from the lower electrode portion, and the bottom member B is attached to the support rod 5 of one processing part and the support rod 5 of the other. The upper surface member C is supported. Then, one end of the body A is inserted into the electrode portion of one processed portion and the other end is inserted into the electrode portion of the other processed portion, and the support member 12 is extended forward and expanded as shown in FIG. Then, the body A is stably supported by the support member 12, and the body A and the bottom surface member B are supported by the pair of processing parts I and II.
The welding work with the upper surface member C can be performed. To shift the welding position, rotate the entire body.

When processing the rectangular container bag shown in FIG. 7, it is necessary to weld the straight line portion and the corner portion as shown in FIG. The welding of the straight line portion is performed in a fixed dimension X, but the welding of the corner portion Y changes the shape of the electrode. That is, the electrode shape is changed when the welding pattern changes. At this time, the lower electrode is changed inside the workpiece by rotating the supporting rod 5 of the lower electrode. The upper electrode can be changed by a replacement or a stand type.

FIG. 6 shows an embodiment in which a plurality of upper electrodes are provided so that switching can be performed automatically. In this embodiment, two upper electrodes 1 and 1 are supported at positions different from each other by 90 degrees on a rotation shaft, and a rotation shaft on which the upper electrode is supported is rotated by a cylinder 25. Therefore, when switching the upper electrode, the expansion and contraction of the cylinder 25 can be performed.

The support member 12 in the present invention is not limited to the one that expands and contracts as shown in the drawings, but may be fixed, mechanically opened and closed, or non-rotatable.
Further, the support member may be a combination of advancing / retreating, rotating, opening / closing, or expanding / contracting. However, the work that is opened and closed or expanded and contracted is convenient for inserting the bottom member and the top member into the support rod 5, and the rotatable one is convenient when the processing position is shifted. . If the lower electrode mounted on the support rod 5 is arranged so that its direction can be changed as shown by the chain double-dashed line in FIG. It is convenient for passing through the outlet D.

FIG. 5 shows an embodiment in which the entire one working portion I of the pair of working portions I and II can be moved back and forth toward the other working portion II. That is, in this embodiment, the main body frame 3a of the processing portion I and the main body frame 3b of the processing portion II are separate bodies, and the processing portion I is such that the entire main body frame 3a serves as a dolly and can move along the rail 26. There is. A power supply unit and an oscillating unit for the electrodes of the processing units I and II are provided in the main body frame 3b on the fixed side, and wiring is separately provided for the electrodes of the moving processing unit. The high frequency welder according to this embodiment is
The body frame 3a is moved and used according to the dimensions of the workpiece.

The high-frequency welder according to the present invention supports a work piece from its inner surface by a supporting member when welding a cylindrical product. In the illustrated example, the end surface processing is described. However, the present invention can be applied to a planar product, such as a product for processing the left and right edges of a continuous sheet material, when the peripheral surface of a tubular product is processed.

[0023]

According to the high frequency welder of the first aspect of the present invention, when welding both ends of the workpiece, both ends of the workpiece are supported by the supporting members of the processing portions located at the opposite positions. Can support. Therefore, it is possible to avoid the influence that the work piece is pulled by its own weight in each processing portion and the fact that the whole work piece is twisted and the work becomes difficult when the processing position is changed.
Further, when changing the welding pattern, the lower electrode can be changed only by rotating the support rod of the lower electrode without removing the workpiece from the set state.

According to the second aspect of the present invention, when changing the welding pattern, it is possible to easily change not only the lower electrode but also the upper electrode.

According to the third aspect of the invention, the supporting position of the workpiece by the support member can be selected according to the shape of the workpiece. Further, when changing the processing position of the work piece, it is not necessary to slide the work piece and the support member, and the work can be easily performed, and the surface of the work piece is scratched. Unlikely.

[Brief description of drawings]

FIG. 1 is a front view of the entire high-frequency welder that is an embodiment of the present invention,

FIG. 2 is a vertical cross section showing only a lower electrode portion,

FIG. 3 is a vertical cross-sectional view showing an example of a support member for a workpiece,

FIG. 4 is a front view showing a state of welding work by the high-frequency welder of the present invention,

FIG. 5 is a front view showing an embodiment in which one processing portion can be moved back and forth with respect to the other;

FIG. 6 is a front view of only one processed portion showing an embodiment in which an upper electrode is switchable;

FIG. 7 is a perspective view showing an example of a product processed by a high-frequency welder,

FIG. 8 is a plan view showing an example of a welding pattern.

[Explanation of symbols]

 1 Upper Electrode 2 Lower Electrode 3 Body Frame 5 Support Rod 6 Bearing 7 Bearing 8 Motor 9 Gear 10 Drive Gear 11 Shaft 12 Bearing Member 14 Rodless Cylinder 25 Cylinder

Claims (3)

[Claims] 1. A welding process in which a work piece is interposed between a lower electrode provided at a tip of a supporting rod protruding from a main body frame and an upper electrode above the lower electrode and moving up and down toward the lower electrode. In the high-frequency welder for performing the above, two processing parts composed of a lower electrode and an upper electrode are provided as a pair at opposing positions, and the supporting rods of the lower electrodes in the respective processing parts are made rotatable and the lower ends are respectively rotated at different rotation positions. A high-frequency welder, characterized in that electrodes are provided, and support members for supporting a part of the workpiece are provided at the ends of the upper and lower electrodes. 2. The high frequency welder according to claim 1, wherein the upper electrode facing the lower electrode is switchable from a plurality of electrodes. 3. A support member for an object to be processed is attached to the tip of a shaft that penetrates a support rod of a lower electrode, and the shaft is made movable back and forth by a cylinder, and the support member is a shaft for supporting the same. The high frequency welder according to claim 1, wherein the high frequency welder is rotatable relative to the high frequency welder.