JP2018132106A - High frequency dielectric deposition device for stepped tube and high frequency dielectric deposition method for stepped tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve deposition without deforming the shape of a part where a second tube of a stepped tube is overlaid on one end of a first tube.SOLUTION: When a first electrode, an insulation plate and a second electrode having side faces abutting on a press surface pressing an outer peripheral surface of a first tube 1 or a second tube 2 are stacked in order and a high-frequency power supply unit P applies a high-frequency voltage between the first electrode and the second electrode, a high frequency dielectric deposition device is configured to block by the insulation plate the high-frequency voltage applied between the first electrode and the second electrode for the end face of the second tube, and to apply the high-frequency voltage between the first electrode and the second electrode within an overlap end part of the first tube and the second tube between the first electrode and the second electrode, and generates heat to melt through a dielectric action in which molecules of the first tube and the second tube are inverted, and cools and solidifies them after the first tube and the second tube mutually melt into one to form a region where they adhere to each other.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a high-frequency dielectric welding apparatus for a stepped tube using a polymer resin material, and a high-frequency dielectric welding method for a stepped tube, and more particularly, a stepped portion in which different diameter tubes for medical use or tubes having different thicknesses are stacked. In addition, the present invention relates to a high-frequency dielectric welding apparatus and a high-frequency dielectric welding method suitable for welding a stepped portion for attaching a drip tube of a drip container, and other steps having a tube and a joint overlapped with each other.

Conventionally, there are a high-frequency dielectric welding apparatus and a high-frequency dielectric welding method in which a stepped portion in which a pair of different diameter tubes for medical use are stacked and a stepped portion for mounting an infusion tube of an infusion container are welded by high-frequency dielectric heating. Are known.
In high-frequency dielectric heating, when a high frequency (high frequency alternating voltage) is applied to a polar plastic, the plastic molecule's poles continue to invert in response to changes in the polarity of the high frequency, the molecular motion becomes active, and heat is generated. Thermoplastic resins such as vinyl chloride (PVC) are suitable materials. Actually, as shown in FIGS. 14 and 17, the thermoplastic resin is welded by high-frequency dielectric heating (see, for example, Patent Document 1).

  In FIG. 14, the left end of the first tube 21 is covered with the second tube 22, and each of the outer circumferences of the second tube 22 has a block shape or a plate shape, and is configured to be freely divided and combined on the top and bottom of the paper surface. First electrodes 23a and 23b, insulating plates 24a and 24b, and second electrodes having a semicircular cut-out section that receives and closely contacts the first tube 21 and the second tube 22 on the respective overlapping surfaces. The electrodes 25a and 25b are applied, and the first electrodes 23a and 23b and the second electrodes 25a and 25b are connected to the high-frequency power source 26. Incidentally, in the high frequency power supply 26, for example, a high frequency current of 10 MHz to 40 MHz is applied to the first electrodes 23a and 23b and the second electrodes 25a and 25b.

  In FIG. 14, when a high frequency current alternating between a positive electrode and a negative electrode at a high frequency is passed between the first electrodes 23a, 23b and the second electrodes 25a, 25b by the high frequency power source 26, the one electrode is alternately directed toward the other electrode. A high frequency voltage is applied to. Then, the molecular poles of the first tube 21 and the second tube 22 inside the notches of the insulating plates 24a and 24b continue to be reversed as indicated by dotted lines with double-ended arrows in FIG.

  In the first tube 21 and the second tube 22 in the vicinity of the insulating plates 24a and 24b, the molecules of the first tube 21 and the second tube 22 generate heat by repeatedly reversing the polarity of the positive electrode and the negative electrode due to the dielectric action of the high-frequency current. Then, the hatched area 29 indicated by the dotted line in FIG. 15 is melted. When the energization of the high frequency power supply 26 is stopped, the hatched areas 29 of the first tube 21 and the second tube 22 are cooled and solidified and welded.

  In FIG. 14, an image in which the poles of plastic molecules are inverted is indicated by three dotted arrows with double-ended arrows. The portion of the first tube 21 and the second tube 22 near the surface where the first and second electrodes are in contact with each other inverts the plastic molecule pole, but the portion away from the first and second electrodes is the plastic molecule. The poles are difficult to reverse. Therefore, when the thickness of the second tube 22 or the thickness of the first tube 21 and the second tube 22 is large, from the surface where the first and second electrodes are in contact with the first tube 21 and the second tube 22. The calorific value decreases at a distance.

  In an extreme case, the second tube 22 in the vicinity where the first electrodes 23a and 23b and the second electrodes 25a and 25b are in contact with each other generates heat, melts and solidifies, but the first electrodes 23a and 23b and the second electrodes 25a and 25b. The first tube 21 that is away from the tube does not generate heat or melt, and the contact portion between the first tube 21 and the second tube 22 may not be welded. For this reason, the conventional high-frequency dielectric welding apparatus has a problem that the thickness of the tube that can be welded, particularly the thickness of the second tube is limited.

  Also, in Patent Document 1, as shown in FIGS. 16 and 17, a tube 32 is provided at the end of an infusion container 31, a step joint 37 is welded to the tube 32, and an infusion tube is attached to the step joint 37. An example in which 38 is fitted is shown. In this conventional example, as shown in the schematic cross section of the high-frequency dielectric welding apparatus in FIG. 17, the end surface 32a of the tube 32 and the end surface of the stepped portion of the stepped joint 37 are abutted to each other on the outer periphery toward the paper surface. The first electrodes 33a and 33b, the insulating plates 34a and 34b, and the second electrodes 35a and 35b, which can be divided and combined vertically, are applied, and a high frequency voltage is applied from a high frequency power source 36.

  When the high frequency power supply 36 is energized in the assembled state of the welding electrode shown in FIG. 17, the inner side of the notch portion of the insulating plate 34 is alternately arranged between the first electrodes 33a and 33b and the second electrodes 35a and 35b in FIG. A high frequency voltage is applied as indicated by a dotted line with double-ended arrows, and the poles of the plastic molecule are inverted. 18A and 18B are enlarged views showing an E portion of FIG. 17 in an enlarged manner for understanding the invention. In FIG. 17, an image showing the direction in which the plastic molecule poles are reversed is shown by three dotted arrows with double-ended arrows, but FIGS. 18A and 18B show the plastic molecule poles as an example of one dotted arrow line. It is illustrated in which member the direction is reversed from which member to which member.

  That is, when a high frequency voltage is applied between the first electrode 33a and the second electrode 35a by the high frequency power supply device 36, as shown in FIG. 18A, (S) the pole of the plastic molecule from the first electrode 33a to the stepped joint 37 is obtained. (T) The plastic molecule pole is oriented in the axial direction of the tube from the stepped joint 37 directly below the insulating plate 34a to the tube 32, and (U) the plastic molecule pole is directed from the tube 32 to the second electrode 35a. Is suitable. Next, as shown in FIG. 18B, the plastic molecule poles are reversed in the opposite direction, (U ′) from the second electrode 35a to the tube 32, and (T ′) from the tube 32 directly below the insulating plate 34a to the stepped joint 37. The plastic molecule poles are oriented in the axial direction of the tube and from the (S ′) stepped joint 37 to the first electrode 33a. Thereafter, the polarity of the plastic molecule continues to invert as the polarity of the high frequency changes.

In the stepped joint 37 and the tube 32, the molecules repeatedly invert the polarity in the axial direction of the tube to generate heat and melt. When energization of the high-frequency current is stopped, the portion where the stepped joint 37 and the tube 32 are abutted is solidified and welded as shown by regions 39a and 39b indicated by dotted lines in FIG.
In the stepped joint 37 and the tube 32, the pole of the plastic molecule is inverted at the portion close to the surface where the first and second electrodes are in contact, but the portion away from the first and second electrode is the plastic molecule. The pole is difficult to reverse. Therefore, the plastic molecule generates heat at the portion where the end surface of the stepped portion of the stepped joint 37 and the end surface of the tube 32 are butted, but the portion where the tube 32 and the stepped joint 37 overlap in the radial direction generates heat. decrease. Therefore, in the example of FIG. 17, the end surface of the partial tube 32 close to the surface with which the first and second electrodes are in contact with the butted surface where the end surface of the stepped portion of the stepped joint 37 is butted and the vicinity are welded. To obtain the required strength.

  19A is a cross-sectional view when the tube 32 and the stepped joint 37 are welded, and FIG. 19B shows a state in which another tube 38 is fitted to the other end of the stepped joint 37 welded to the tube 32. Yes. Since the shape of the end face of the stepped joint 37 on which the other tube 38 is fitted is not deformed, the end face of the other tube 38 and the stepped joint 37 can be satisfactorily adhered.

JP 60-1495

  The present invention relates to a high-frequency dielectric welding apparatus for a stepped tube using a polymer resin material, and a high-frequency dielectric welding method for a stepped tube, and more particularly, a stepped portion in which different diameter tubes for medical use or tubes having different thicknesses are stacked. And a new high-frequency dielectric welding apparatus and a new high-frequency dielectric welding method suitable for welding a stepped portion for attaching a drip tube of a drip container, and a stepped portion where a tube and a joint overlap each other. It is an issue.

  More specifically, the present invention relates to a new step that reliably performs high-frequency dielectric welding in the radial direction of the tube while maintaining the shape of the stepped portion where the tubes are overlapped or the stepped portion where the tube and the joint overlap. It is an object of the present invention to provide a high frequency dielectric welding apparatus for a tube with a tip and a high frequency dielectric welding method for a new stepped tube.

  Each is a high-frequency dielectric welding apparatus made of a polymer resin material, in which one end portion of a small-diameter first tube is fitted into a large-diameter second tube and the overlapping end portions of the first and second tubes are high-frequency dielectric welded. The first electrode having a pressing surface for applying a high frequency voltage by pressing the outer peripheral surface near one end of the first tube and the high frequency voltage by pressing the outer peripheral surface of the overlapping end of the second tube A second electrode having a pressing surface and an insulating plate interposed between the first and second electrodes to electrically insulate the first and second electrodes when the first and second tubes are overlapped An insulating plate having a side surface attached in contact with the entire end surface of the second tube formed in a step shape, a pressing surface for pressing the outer peripheral surface near one end of the first tube, the first electrode, and the first electrode High for applying high-frequency voltage between two electrodes A high frequency voltage applied between the first electrode and the second electrode with an insulating plate when a high frequency voltage is applied between the first electrode and the second electrode by the high frequency power supply. And configured to apply a high-frequency voltage between the first electrode and the second electrode in the overlapping end portion of the first tube and the second tube between the first electrode and the second electrode. After the first tube and the second tube are melted by a dielectric action in which the polarities of the molecules of the two tubes are reversed, the first tube and the second tube are melted together, and then cooled and solidified to form a region where they are welded together.

The present invention can reliably perform high-frequency dielectric welding in the radial direction of the tube while maintaining the shape of the stepped portion where the tubes are overlapped or the stepped portion where the tube and the joint overlap.
As an incidental effect of the present invention, even when the thickness of the second tube or the thickness of the first tube and the second tube is large, the stepped portion where the first tube and the second tube are stacked is arranged in the radial direction of the tube. Dielectric welding can be performed.

The present invention is not limited to welding thin tubes, but a stepped tube that enables welded connection between thick tubes or between a thick tube and a thin tube without using a stepped joint. The high frequency dielectric welding apparatus and the stepped tube high frequency dielectric welding method can be provided.
Moreover, since the operation | work which passes an electrode through a tube is unnecessary for what uses the split type electrode by this invention, the tact time of a welding operation | work can be shortened.

Sectional drawing which showed schematic structure of the high frequency dielectric welding apparatus which concerns on Embodiment 1 of this invention. The left view which showed schematic structure of the high frequency dielectric welding apparatus which concerns on Embodiment 1 of this invention. 1 shows a first tube and a second tube that are separated from the lower electrode portion and the upper electrode portion of the high-frequency dielectric welding apparatus according to Embodiment 1 of the present invention, and show a positional relationship with each other. FIG. In the high frequency dielectric welding apparatus which concerns on Embodiment 1 of this invention, the figure which showed the state which made the upper electrode and the lower electrode contact each on the upper and lower outer peripheral surface of a stepped tube, and is applying the high frequency voltage. The enlarged view of D section of FIG. 4 of the high frequency dielectric welding apparatus which concerns on Embodiment 1 of this invention. It is the enlarged view of D section of FIG. 4 of the high frequency dielectric welding apparatus which concerns on Embodiment 1 of this invention, and the figure which showed another voltage application state. Sectional drawing of the stepped tube welded with the high frequency dielectric welding apparatus which concerns on Embodiment 1 of invention. Sectional drawing which showed the state which fitted the other tube to the stepped tube welded with the high frequency dielectric welding apparatus which concerns on Embodiment 1 of this invention. The figure shown. The similar enlarged view corresponding to the D section of Drawing 4, showing the modification of the high frequency dielectric welding apparatus concerning Embodiment 1 of the present invention. The similar enlarged view which shows another modification of the high frequency dielectric welding apparatus which concerns on Embodiment 1 of this invention, and respond | corresponds to D part of FIG. Sectional drawing which showed schematic structure of the high frequency dielectric welding apparatus which concerns on Embodiment 2 of this invention. Sectional drawing of the tube which carried out the high frequency dielectric welding in the high frequency dielectric welding apparatus which concerns on Embodiment 2 of this invention. Sectional drawing which showed schematic structure of the high frequency dielectric welding apparatus which concerns on Embodiment 3 of this invention. Sectional drawing of the tube which carried out the high frequency dielectric welding in the high frequency dielectric welding apparatus which concerns on Embodiment 3 of this invention. Sectional drawing which showed schematic structure of the high frequency dielectric welding apparatus which concerns on Embodiment 4 of this invention. Sectional drawing which showed schematic structure of the high frequency dielectric welding apparatus which concerns on Embodiment 5 of this invention. The figure which showed the state which made the upper electrode and the lower electrode contact each on the upper and lower outer peripheral surface of a stepped tube, and is applying the high frequency voltage with the conventional high frequency dielectric welding apparatus. The figure which showed the cross section of the stepped tube which carried out the high frequency dielectric welding with the conventional high frequency dielectric welding apparatus. The disassembled perspective view which showed the positional relationship of the conventional drip container, a stepped coupling, and a drip tube. In a conventional high-frequency dielectric welding apparatus, the first electrode and the second electrode are brought into contact with the upper and lower outer peripheral surfaces of the drip container end tube and the upper and lower outer peripheral surfaces of the stepped joint, respectively, and a high-frequency voltage is applied. The figure shown. The enlarged view of the E section of FIG. 17 of the conventional high frequency dielectric welding apparatus. FIG. 18 is an enlarged view of a portion E in FIG. 17 of the conventional high-frequency dielectric welding apparatus, showing another voltage application state. The figure which showed the cross section of the stepped tube which carried out the high frequency dielectric welding with the conventional high frequency dielectric welding apparatus. Sectional drawing which shows the state which fitted the other tube to the stepped tube which carried out the high frequency dielectric welding with the conventional high frequency dielectric welding apparatus.

(Embodiment 1)
In the first embodiment, one end of the first tube having a small outer diameter, in other words, a thin first tube, the inner diameter is substantially the same as the first tube, and the outer diameter is larger than the first tube, in other words, a thick second tube. The overlapped end of the stepped tube is taken as an example of a stepped tube with the end surface of the second tube formed on the overlapped end as the end surface of the stepped portion. A high frequency dielectric welding apparatus that performs high frequency dielectric welding in the radial direction of the tube will be described.

FIG. 1 is a cross-sectional view showing a schematic configuration of the high-frequency dielectric welding apparatus according to the first embodiment, and FIG. 2 is a left side view showing a schematic configuration of the high-frequency dielectric welding apparatus according to the first embodiment.
The high-frequency dielectric welding apparatus according to Embodiment 1 is a high-frequency dielectric welding apparatus that performs high-frequency dielectric welding of a stepped tube in which a second tube 2 is superimposed on one end of a thin first tube 1 as shown in FIG. In the first embodiment, a divided block type electrode and a divided type insulating plate, which are divided vertically in the drawing, are used. As will be described in detail later, a tube is closely attached to the mating surface of each electrode and insulating plate. A notch (pressing surface) to be accommodated is formed.

  More specifically, the welding apparatus according to the first embodiment includes the first electrodes 3a and 3b each having pressing surfaces 3a1 and 3b1 for pressing the outer peripheral surface of the thin first tube 1, and the outer peripheral surface of the same thin first tube 1. Insulating plates 4a and 4b having L-shaped cross sections each having pressing surfaces 4a1 and 4b1 for pressing the second electrodes 5a and 5b1 having pressing surfaces 5a1 and 5b1 for pressing the outer peripheral surface of the second tube 2, respectively. I have. The insulating plates 4a and 4b are in contact with the respective side surfaces 4a2 and 4b2 of the entire end surface 2a of the second tube 2. In FIG. 1, the power supply plate 6 and the power supply terminal portion 6a are disposed above the second electrode 5a. The ground plate 7 is disposed below the first electrode 3b. Then, the insulating plates 4a and 4b having an L-shaped cross section are arranged in such a manner that the L-shaped horizontal portions extend to opposite sides, and the insulating plate 4a insulates the power feeding plate 6 and the first electrodes 3a and 3b, The insulating plate 4b insulates the ground plate 7 and the second electrodes 5a and 5b.

  The first electrodes 3a and 3b and the second electrodes 5a and 5b are divided in the vertical direction and can be combined, and the first electrodes 3a and 3b are electrically connected by the connection plate 3c shown in FIG. The second electrodes 5a and 5b are electrically connected by the connection plate 5c shown in FIG. That is, the first electrodes 3 a and 3 b are electrically connected to the ground plate 7, and the second electrodes 5 a and 5 b are electrically connected to the power feeding plate 6. The high frequency power supply device P is connected to the power supply plate 6 and the ground plate 7. Note that the plus (+) and minus (−) symbols in FIG. 1 are shown as symbols indicating the positive electrode and the negative electrode for the understanding of the invention.

The outer diameter and the inner diameter of the tip of the second tube 2 are the same as those of the other tubes 10 fitted to the thin first tube 1 as shown in FIGS. 6A and 6B described later. The end surface 2a at the tip of the second tube 2 is finished to a plane that contacts the side surfaces 4a2, 4b2 of the insulating plates 4a, 4b and the end surface 10a of the other tube 10.
FIG. 3 shows a first tube and a second tube separated from each other by separating the lower electrode portion and the upper electrode portion of the high-frequency dielectric welding apparatus according to Embodiment 1 of the present invention. It is an exploded sectional view showing a positional relationship.

  When the welding operation is started, a stepped tube in which one end portion of the first tube 1 is inserted into the second tube 2 and overlapped with the lower electrode portion is placed as indicated by the arrow A, and the upper electrode portion is indicated by the arrow B. The lower electrode part and the upper electrode part are combined together. At this time, the pressing surface of each electrode presses the outer peripheral surface of the tubes 1 and 2, and the electrode is attached so as to be in close contact with the outer peripheral surface of the tube, so that uniform welding performance of the tube overlapping portion is ensured. Yes. After the electrodes are assembled in this way, a high frequency voltage is applied to the power supply plate 6 and the ground plate 7 from the high frequency power supply device P.

  FIG. 4 is a high-frequency dielectric welding apparatus according to Embodiment 1 of the present invention, in which the upper electrode portion and the lower electrode portion are brought into contact with the upper and lower outer peripheral surfaces of the stepped tube, respectively, and a high-frequency current is energized. FIG. FIGS. 5A and 5B are enlarged views showing a portion D of FIG. 4 of the high frequency dielectric welding apparatus according to Embodiment 1 of the present invention in an enlarged manner for understanding the invention. 5A and 5B show that the direction in which the high-frequency voltage is applied is reversed, and that the polarity is alternately inverted depending on the timing. In FIG. 4, the image indicating the direction in which the plastic molecule poles are reversed is shown by three dotted arrows. However, FIGS. 5A and 5B show an example of the plastic molecule poles using a single dotted dotted line as an example. It has been described which direction of the member is reversed from which member to which member.

  When a high frequency voltage is applied between the power supply plate 6 and the ground plate 7 by the high frequency power supply device P, as shown in FIG. 5A, (a) the plastic molecule poles are directed from the first electrode 3a to the first tube 1, b) In the first tube 1 directly below the insulating plate 4a, the plastic molecule poles are oriented in the axial direction of the tube, and (c) the plastic molecule poles are directed from the first tube 1 to the second tube 2 in the radial direction of the tube. Orientation, (d) The plastic molecule poles are directed from the second tube 2 to the second electrode 5a. As shown in FIG. 5B, the poles of the plastic molecules are reversed in the opposite direction, and (d ′) the radius of the tube from the second electrode 5a to the second tube 2 and (c ′) the second tube 2 to the first tube 1. In the direction, (b ′) the first tube 1 directly under the insulating plate 4 is oriented in the axial direction of the tube, and (a ′) the plastic molecule poles from the first tube 1 to the first electrode 3a. Thereafter, the polarity of the plastic molecule continues to invert as the polarity of the high frequency changes.

Then, due to the dielectric action of the high-frequency current, the molecules inside the first tube 1 and the second tube 2 repeat the polarity reversal of the positive electrode and the negative electrode and generate heat and melt.
When energization of the high-frequency current is stopped, the portions of the first tube 1 and the second tube 2 that overlap in the radial direction of the tube are solidified and welded as shown in a region 9 indicated by dotted lines in FIGS. 6A and 6B. .

  In the present invention, when a high frequency voltage is applied between the first electrode and the second electrode by a high frequency power source, the high frequency voltage applied between the first electrode and the second electrode with respect to the end face of the second tube is blocked by the insulating plate. And a high frequency voltage is applied between the first electrode and the second electrode in the radial direction between the first electrode and the second electrode in the overlapping end portion of the first tube and the second tube. There are features.

  And according to this invention, the outer peripheral surface 1b of the front-end | tip of the 1st tube 1 is pressed by the press surface of 1st electrode 3a, 3b, and the perimeter is contact | abutted uniformly and the cylindrical shape is maintained, and the 2nd tube 2 is in contact with the insulating plates 4a and 4b to maintain a flat surface, and the outer peripheral surface 2b of the second tube 2 is in contact with the second electrodes 5a and 5b to maintain a cylindrical shape. The original shape is kept unchanged during heating during welding.

From the right side of FIG. 6A, when another tube 10 indicated by a two-dot chain line imaginary line is fitted into the first tube 1 and pushed in the axial direction, the end face 10b of the tube 10 is second as shown in FIG. 6B. It abuts against the flat surface of the distal end surface 2 a of the tube 2.
According to the present invention, since the dielectric welding is performed in a state where the outer peripheral surface and the end surface of the tube are constrained by the electrode and the insulating plate, the outer shape of the stepped portion is prevented from being deformed. Since the outer peripheral surface 1b of the first tube is prevented from being deformed by heating at the time of welding, the outer shape of the stepped portion and the other tube 10 can be bonded closely together.

To repeat the description, according to the present invention, a high-frequency voltage is applied in the radial direction of the tube at the portion of the first tube 1 and the second tube 2 that overlap in the radial direction (overlapping end). Due to the dielectric action of the high-frequency current, the molecules inside the first tube 1 and the second tube 2 are repeatedly heated and melted by reversing the polarity of the positive electrode and the negative electrode, and are fused together.
The first tube 1 and the second tube 2 can be welded with a predetermined strength regardless of the thickness of the wall.

Further, the shape of the stepped portions of the first tube 1 and the second tube 2 is not changed.
In the first embodiment according to the present invention, the pressing surfaces of the first electrodes 3a, 3b and the insulating plates 4a, 4b are brought into contact with the outer peripheral surface 1b of the first tube 1 so as to be placed on the side surfaces of the insulating plates 4a, 4b. Although it is required that the second electrode 2 is in contact with the entire end surface 2a and the outer surface 2b of the second tube is in contact with the pressing surface of the second electrode, the first electrode is in contact with the pressing surface of the first electrode. The diameter of the outer periphery of the tube and the diameter of the outer periphery of the first tube with which the pressing surface of the insulating plate abuts may be the same, or the high frequency dielectric welding according to Embodiment 1 of the present invention shown in FIGS. 7A and 7B. It may be different as in a variation of the device.

  In FIG. 7A, the diameter of the outer periphery of the first tube with which the pressing surface of the first electrode abuts is larger than the diameter of the outer periphery of the first tube with which the pressing surface of the insulating plate abuts. In FIG. The diameter of the outer periphery of the first tube that contacts is smaller than the diameter of the outer periphery of the first tube that the pressing surface of the insulating plate contacts, but even if the diameter of the outer periphery of the first tube changes in this way, This is because the flow is the same as in FIGS. 5A and 5B.

Further, the present invention uses a split type electrode. Therefore, the time-consuming work of passing the electrode through the tube before dielectric welding and removing the electrode from the tube after dielectric welding is unnecessary, so that the tact time of the welding work can be shortened.
(Embodiment 2)
In the second embodiment, the shape of the outer peripheral surface on the distal end side of the second tube 12 is a truncated cone shape whose radius is gradually reduced toward the front. FIG. 8 is a cross-sectional view showing a schematic configuration of a high-frequency dielectric welding apparatus according to Embodiment 2 of the present invention. In the figure, components, members, parts, and the like that are similar to those of the first embodiment described above and that can be easily inferred from the effects are denoted by the same reference numerals and description thereof is omitted ( The same applies hereinafter).

In FIG. 8, the distal end portion 12 b of the second tube 12 is thin in a truncated cone shape, and the outer diameter of the distal end is the same as the outer diameter of the other tube 13 fitted to the thin first tube 1. The distal end surface 12 a of the second tube 12 is finished to be a flat surface that comes into contact with the side surface of the insulating plate 4 a and the end surface 13 a of the other tube 13.
In FIG. 8, when a high-frequency voltage is applied from a high-frequency power source P (not shown) to the first electrodes 3a, 3b and the second electrodes 5c, 5d, the plastic molecule poles are directed from the first electrodes 3a, 3b to the first tube 1, Then, when the plastic molecule poles are oriented in the axial direction of the tube in the first tube 1 immediately below the insulating plates 4a and 4b and pass directly under the insulating plates 4a and 4b, the tube is transferred from the first tube 1 to the second tube 12. The plastic molecule poles are directed in the radial direction, and then the plastic molecule poles are directed from the second tube 12 to the second electrodes 5c and 5d. The plastic molecule poles are reversed in the opposite direction, from the second electrodes 5c and 5d to the second tube 12, and from the second tube 12 to the first tube 1 in the radial direction of the tube, directly below the insulating plates 4a and 4b. The plastic molecule poles are directed from the first tube 1 to the first electrodes 3a and 3b. Thereafter, the polarity of the plastic molecule continues to invert as the polarity of the high frequency changes.

Then, due to the dielectric action of the high-frequency current, the molecules inside the first tube 1 and the second tube 12 repeat the polarity reversal of the positive electrode and the negative electrode to generate heat and melt. When the application of the high-frequency current is stopped and the application of the high-frequency voltage is stopped, the overlapping portion of the first tube 1 and the second tube 12 is solidified and welded as a hatched area 9a indicated by a dotted line in FIG.
Also in Embodiment 2 of the present invention, when a high frequency voltage is applied between the first electrode and the second electrode by a high frequency power source, the high frequency voltage applied between the first electrode and the second electrode with respect to the end face of the second tube by the insulating plate. And applying a high-frequency voltage between the first electrode and the second electrode in the radial direction between the first electrode and the second electrode in the overlapping end portion of the first tube and the second tube. This is the same as in the first embodiment.

  FIG. 9 is a diagram showing a cross-sectional view of a tube subjected to high-frequency dielectric welding with the high-frequency dielectric welding apparatus according to Embodiment 2 of the present invention. According to Embodiment 2 of the present invention, as shown in FIG. The outer peripheral surface 12b at the tip of the second tube 12 is in contact with the second electrodes 5c and 5d to maintain a conical shape, and the end surface 12a at the tip is in contact with the insulating plates 4a and 4b to maintain a flat surface. The outer peripheral surface 1b of the tube 1 is in contact with the first electrodes 3a and 3b to maintain a cylindrical shape, and the original shape is maintained without being deformed despite the heating of the dielectric welding.

From the right side of FIG. 9, when the other tube 13 indicated by the phantom line of the two-dot chain line is fitted to the outer periphery 1 b of the end of the first tube 1 and pushed in the axial direction, the end surface 13 a of the tube 13 becomes the second tube 12. It contacts the flat surface of the tip surface 12a. Since the outer shape of the stepped portion is not deformed even by dielectric welding, the outer shape of the stepped portion and the other tube 13 adhere well.
In Embodiment 2 of the present invention, the tip of the second tube 12 has a truncated cone shape, and the tip 12a has the same outer diameter as the other tube 13 fitted to the thin first tube 1. Therefore, there is an advantage that the outer shape of the tube changes smoothly, is visually attractive, and bends flexibly even if bending force is applied.
(Embodiment 3)
In the third embodiment, the shape of the outer peripheral surface on the distal end side of the second tube 14 is a shape in which the radius gradually decreases toward the front, that is, a shape in which cylinders are stacked. FIG. 10 is a cross-sectional view showing a schematic configuration of a high-frequency dielectric welding apparatus according to Embodiment 3 of the present invention. FIG. 11 is a cross-sectional view of a high frequency dielectric welded tube in the high frequency dielectric welding apparatus according to Embodiment 3 of the present invention.

In FIG. 10, the distal end portion of the second tube 14 is gradually reduced, and the outer diameter at the distal end 14 a is the same as the outer diameter of the other tube 13 fitted to the outer peripheral surface 1 b of the thin first tube 1. It is. Therefore, the front end surface 14a of the second tube 14 is in contact with the surface of the insulating plate 4a.
In FIG. 10, when a high frequency voltage is applied from a high frequency power supply P (not shown), the plastic molecule poles are directed from the first electrodes 3a, 3b to the first tube 1, and the first tube 1 directly below the insulating plates 4a, 4b. When the plastic molecule pole is oriented in the axial direction of the tube and passes directly under the insulating plates 4a and 4b, the plastic molecule pole is oriented radially from the first tube 1 to the second tube 14, and then the second tube 14 The plastic molecule poles face the second electrodes 5e and 5f.

The poles of the plastic molecules are reversed in the opposite direction, passing through the second electrodes 5e, 5f from the second tube 14 and from the second tube 14 to the first tube 1 in the radial direction, directly below the insulating plates 4a, 4b. The plastic molecule poles are directed from the first tube 1 to the first electrodes 3a, 3b. Thereafter, the polarity of the plastic molecule continues to invert as the polarity of the high frequency changes.
And the molecule | numerator inside the 1st tube 1 and the 2nd tube 14 repeats polarity inversion, and fuse | melts by the dielectric effect of a high frequency current. When the application of the high-frequency current is stopped and the application of the high-frequency voltage is stopped, the overlapping portion of the first tube 1 and the second tube 14 is solidified and welded as shown by the hatched area 9b indicated by the dotted line in FIG.

  Also in Embodiment 3 of the present invention, when a high frequency voltage is applied between the first electrode and the second electrode by a high frequency power source, the high frequency voltage applied between the first electrode and the second electrode with respect to the end face of the second tube by the insulating plate. And applying a high-frequency voltage between the first electrode and the second electrode in the radial direction between the first electrode and the second electrode in the overlapping end portion of the first tube and the second tube. This is the same as in the first embodiment.

In Embodiment 3 of the present invention, the outer peripheral surface 14b at the tip of the second tube 14 is in contact with the second electrodes 5e and 5f to maintain a cylindrical shape, and the end surface 14a at the tip is in contact with the insulating plates 4a and 4b. Thus, the flat surface is maintained, and the outer peripheral surface 1b of the first tube 1 is in contact with the first electrodes 3a and 3b to maintain a cylindrical shape. As a result, the original shape is kept unchanged.
From the right side of FIG. 11, when the other tube 13 indicated by the phantom line of the two-dot chain line is fitted to the first tube 1 and pushed in the axial direction, the end surface 13 a of the tube 13 is the plane of the distal end surface 14 a of the second tube 14. Abut. Since the outer shape of the stepped portion is not deformed even by dielectric welding, the outer shape of the stepped portion and the other tube 13 adhere well.

In the third embodiment of the present invention, the distal end of the second tube 14 is gradually tapered, and the outer diameter of the distal end is the same as the outer diameter of the other tube 13 fitted to the thin first tube 1. Therefore, there is an advantage that the outer shape of the tube changes in stages, and it bends flexibly even if bending force is applied.
(Embodiment 4)
Although not shown in the above embodiment, when forming a stepped portion for attaching an infusion tube of an infusion container according to the present invention, welding to the infusion container using a straight tube instead of a stepped joint. It can also be formed.

  FIG. 12 is a schematic cross-sectional view of a high-frequency dielectric welding apparatus for forming a stepped portion for attaching an infusion tube of an infusion container, showing Embodiment 4 of the present invention. The outer surface of the first tube 11 is in contact with the pressing surface of the first electrodes 33a, 33b and the pressing surface of the insulating plates 34a, 34b, the side surfaces of the insulating plates 34a, 34b are in contact with the end surface of the tube 32 of the drip container, The pressing surfaces of the second electrodes 35a and 35b are brought into contact with the outer peripheral surface of the tube 32 of the drip container, and a high frequency voltage is applied from the high frequency power source 36 to the first electrodes 33a and 33b and the second electrodes 35a and 35b. One tube 11 and the tube 32 of the drip container are melted, the application of the high frequency voltage is stopped, and the overlapping portion of the first tube 11 and the tube 32 of the drip container is welded in the radial direction of the tube.

In Embodiment 4 of the present invention, the outer shape of the stepped portion is not deformed even if dielectric welding is performed without using the stepped joint as in the conventional examples shown in FIGS. 16 and 17. And the other tube 38 adheres well.
(Embodiment 5)
As a fifth embodiment, a high-frequency dielectric welding apparatus that dielectrically welds a range of a certain length in the axial direction from the step portion of the stepped tube will be described.

  FIG. 13: has shown schematic sectional drawing of the principal part of the high frequency dielectric welding apparatus which carries out the dielectric welding of the range of fixed length to the axial direction from the step part of the stepped tube of Embodiment 5 of this invention. In FIG. 13, in addition to the first electrodes 3a and 3b, the insulating plates 4a and 4b, and the second electrodes 5a and 5b described in the first to fourth embodiments, the second insulating plate is adjacent to the left of the second electrodes 5a and 5b. 4c, 4d, third electrodes 3c, 3d, third insulating plates 4e, 4f, and fourth electrodes 5c, 5d are stacked in the axial direction of the tube.

  In FIG. 13, the end surface of the second tube 2 is in contact with the side surfaces of the insulating plates 4 a and 4 b in the same manner as in the first to fourth embodiments, but the outer periphery 1 b of the thin first tube 1 is pressed. Only the first electrodes 3a and 3b and the insulating plates 4a and 4b are present, the second electrodes 5a and 5b, the second insulating plates 4c and 4d, the third electrodes 3c and 3d, and the third insulating plates 4e and 4f. The fourth electrodes 5 c and 5 d press the outer periphery 2 b of the thick second tube 2.

  The first electrodes 3a, 3b and the third electrodes 3c, 3d are electrically connected by a connecting member 3e, and the second electrodes 5a, 5b and the fourth electrodes 5c, 5d are electrically connected by a connecting member 5e. Yes. Thereby, from the high frequency power supply device P to the power feeding part 6a, the power feeding plate 6, the fourth electrodes 5c and 5d, the third electrodes 3c and 3d, the second electrodes 5a and 5b, the first electrodes 3a and 3b, and the ground plate 7. The high frequency voltage is applied in the opposite direction.

Since the first electrodes 3a and 3b and the insulating plates 4a and 4b press the outer periphery 1b of the thin first tube 1 at the stepped portion of the stepped tube, the first tube 1 and the second tube 2 have a high frequency in the radial direction. A voltage is applied and the contact surfaces where the first tube 1 and the second tube 2 overlap each other are heated by dielectric heating and are the same as described in the first to fourth embodiments.
In the fifth embodiment, in addition to the above, a high frequency voltage is applied between the second electrodes 5a and 5b and the third electrodes 3c and 3d, and also between the third electrodes 3c and 3d and the fourth electrodes 5c and 5d. Yes. Therefore, the first tube 1 and the second tube 2 are also provided between the second electrodes 5a and 5b and the third electrodes 3c and 3d and between the third electrodes 3c and 3d and the fourth electrodes 5c and 5d in the axial direction of the tube. A high frequency voltage is applied in the radial direction.

  When a high frequency voltage is applied between the second electrodes 5a and 5b and the third electrodes 3c and 3d, and also between the third electrodes 3c and 3d and the fourth electrodes 5c and 5d, the second electrode in the axial direction of the tube Dielectric welding is performed between the third electrode and also between the third electrode and the fourth electrode. Therefore, not only the vicinity of the step portion of the stepped tube but also a range of a certain length in the axial direction from the step portion of the stepped tube can be dielectrically welded. In FIG. 13, the dielectric welding range is illustrated with a bold line.

  In the fifth embodiment, since a range of a certain length in the axial direction from the step portion of the stepped tube can be dielectrically welded, there is an effect of increasing the welding strength between the first tube and the second tube. In addition, the dielectric welding range can be expanded in the axial direction of the tube by increasing the number of electrodes as necessary.

  The present invention relates to a high-frequency dielectric welding apparatus for a stepped tube and a high-frequency dielectric welding method for a stepped tube, and in particular, a stepped portion in which a medical first tube and a second tube are overlapped, or an infusion tube of an infusion container. The present invention can be applied to a stepped portion for mounting, a high frequency dielectric welding apparatus for welding a stepped portion where a tube and a joint overlap, and a high frequency dielectric welding method for a stepped tube.

  In addition to medical stepped tubes, high frequency dielectric welding of stepped tubes for chemical experiments, stepped tubes for fluid control circuits such as pneumatic and hydraulic, and stepped tubes of various production machinery Can be applied.

1 First tube
2 Second tube 3 First electrode 4 Insulating plate 5 Second electrode 6 Power feeding portion 7 Ground side surface plate 8 Arrow 9 showing an image showing the direction in which the poles of plastic molecules are reversed 9 Welded portion 10 Tube P high frequency power supply

Claims (6)

Each is a high-frequency dielectric welding apparatus made of a polymer resin material, in which one end portion of a small-diameter first tube is fitted into a large-diameter second tube and the overlapping end portions of the first and second tubes are high-frequency dielectric welded. And
A first electrode having a pressing surface for applying a high-frequency voltage by pressing an outer peripheral surface near one end of the first tube;
A second electrode having a pressing surface for applying a high-frequency voltage by pressing the outer peripheral surface of the overlapping end of the second tube;
An insulating plate interposed between the first and second electrodes to electrically insulate the first and second electrodes, and formed in a step shape when the first and second tubes are overlapped An insulating plate having a side surface attached in contact with the entire end surface of the second tube, and a pressing surface that presses the outer peripheral surface in the vicinity of the one end portion of the first tube;
A high-frequency power source for applying a high-frequency voltage between the first electrode and the second electrode,
When a high frequency voltage is applied between the first electrode and the second electrode by the high frequency power source, the high frequency voltage applied between the first electrode and the second electrode with respect to the end surface of the second tube is blocked by the insulating plate. A high-frequency voltage is applied between the first electrode and the second electrode in the overlapping end portion of the first tube and the second tube between the first electrode and the second electrode,
A region where the first tube and the second tube are heated and melted by a dielectric action that reverses the polarity of the molecules, and after the first tube and the second tube are melted together, they are cooled and solidified to weld each other. Forming a high frequency dielectric welding apparatus.   When a high frequency voltage is applied between the first electrode and the second electrode by the high frequency power source, the high frequency voltage applied between the first electrode and the second electrode with respect to the end surface of the second tube is blocked by the insulating plate. A high-frequency voltage is applied between the first electrode and the second electrode in the radial direction between the first electrode and the second electrode in the overlapping end portion of the first tube and the second tube. The high frequency dielectric welding apparatus according to claim 1.   In the axial direction of the second tube, a second insulating plate, a third electrode, a third insulating plate, and a fourth electrode are further stacked next to the second electrode, and the second insulation is provided on the outer periphery of the second tube. Press each pressing surface of the plate, the third electrode, the third insulating plate, and the fourth electrode, and apply a high frequency voltage between the second electrode and the third electrode, and also between the third electrode and the fourth electrode. The high frequency dielectric welding apparatus for a stepped tube according to claim 1, wherein the contact surfaces of the first tube and the second tube are dielectrically welded. Each is made of a polymer resin material, and is a high-frequency dielectric welding method in which one end portion of a small-diameter first tube is fitted into a large-diameter second tube and the overlapping end portions of the first and second tubes are high-frequency dielectric welded. And
A first electrode having a pressing surface for applying a high-frequency voltage by pressing the outer peripheral surface near one end of the first tube and a high-frequency voltage by pressing the outer peripheral surface of the overlapping end of the second tube A second electrode having a pressing surface and an insulating plate interposed between the first and second electrodes to electrically insulate the first and second electrodes, wherein the first and second tubes are overlapped An insulating plate having a side surface that is attached in contact with the entire end surface of the second tube formed in a step shape, and a pressing surface that presses an outer peripheral surface in the vicinity of one end of the first tube; A high frequency power source for applying a high frequency voltage between one electrode and the second electrode,
Abutting each pressing surface of the first electrode and the insulating plate on the outer periphery of the first tube;
Abutting the side surface of the insulating plate on the entire end surface of the second tube;
Abutting the pressing surface of the second electrode on the outer periphery of the second tube;
Connecting the high frequency power supply device to the first electrode and the second electrode;
A high frequency voltage is applied between the first electrode and the second electrode by the high frequency power source, and the high frequency voltage applied between the first electrode and the second electrode with respect to the end surface of the second tube is blocked by the insulating plate. ,
In the overlapping end of the first tube and the second tube between the first electrode and the second electrode, a high frequency voltage is applied between the first electrode and the second electrode,
The first tube and the second tube are melted by generating heat by a dielectric action that reverses the polarity of the molecules,
After the first tube and the second tube are melted together, they are cooled and solidified to weld each other.
A high frequency dielectric welding method characterized by the above. Applying a high-frequency voltage between the first electrode and the second electrode in the radial direction within the overlapping ends of the first tube and the second tube, between the first electrode and the second electrode,
The first tube and the second tube are melted by generating heat by a dielectric action that reverses the polarity of the molecules,
After the first tube and the second tube are melted together, they are cooled and solidified to weld each other.
The high frequency dielectric welding method according to claim 4, wherein:   In the axial direction of the second tube, a second insulating plate, a third electrode, a third insulating plate, and a fourth electrode are further stacked next to the second electrode, and the second insulation is provided on the outer periphery of the second tube. Press each pressing surface of the plate, the third electrode, the third insulating plate, and the fourth electrode, and apply a high frequency voltage between the second electrode and the third electrode, and also between the third electrode and the fourth electrode. The high frequency dielectric welding method of the stepped tube according to claim 4, wherein the contact surfaces of the first tube and the second tube are dielectrically welded.

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