JP5110731B1 - Thermoplastic member welding apparatus, method, and workpiece - Google Patents

Abstract

【Task】
The present invention, when mounting the joint portion manufactured by a sheet of thermoplastic resin or thermoplastic elastomer in the gap between the piping, when manufacturing by a welding method of pressing the joint portion after heating the joint portion from the raw material sheet, The present invention solves the problem that hinders the powder and liquid to be conveyed because the remaining portion after welding exists.
[Solution]
In view of the above situation, the present invention is characterized in that the occurrence of a residual portion is prevented by providing support portions before and after the overlap portion so as to overlap the end portions of the welded portions, and the above-described drawbacks are eliminated. have.
[Selection] Figure 6

Description

The workpiece to which the present invention is directed is a sheet-like member that is welded by heating utilizing its thermoplasticity because it is difficult to bond with an adhesive, and a typical example of its thickness is 1 mm.

In chemical factories and food factories, raw materials and products that are in the form of powders and liquids are usually routed through piping installed in the factories. This pipe is a metal pipe, and its diameter is, for example, 200 mm. However, it is extremely difficult to connect pipes and pipes with metal parts when cleaning the pipes, so raw materials that are transported inside such as pharmaceutical factories and food factories. When the product is not high temperature and high pressure, it is usual to manufacture and connect a joint portion made by rolling a sheet made of a thermoplastic member having both elasticity and flexibility. FIG. 1 illustrates this situation.

FIG. 1 shows an example of a joint part which is a connecting part between the pipes. As shown in FIG. 1, a joint portion 13 is provided in the gap between the connecting portions of the two pipes 11 and 12, and bands 14 and 15 are enclosed so as to cover the two pipe portions in order to fix the joint portion. And clamp. When cleaning the inside of the tube, the bands 14 and 15 are removed, and the joint portion 13 is pulled out by utilizing its elasticity. Further, when the joint portion 13 is installed again, the joint portion 13 is expanded by applying an appropriate force, and the piping portion is covered and surrounded by the bands 14 and 15 and clamped.

The member used as the joint portion 13 is a sheet shape, and it is necessary to overlap and join the rounded end portions in order to round and form a cylindrical shape as shown in FIG. For this joining, there are an adhesion method called a welding method in which an adhesive is used and a welding method in which heating is performed by utilizing the thermoplasticity of a member and pressure is applied. The present invention relates to an apparatus, a method, and a workpiece for joining materials by a welding method. Examples of the target material include thermoplastic resins such as polypropylene, polyethylene, and polyvinyl chloride, and thermoplastic elastomers such as styrene, olefin, vinyl chloride, urethane, ester, and amide.

Japanese Utility Model Publication No. 38-7696

As an apparatus for performing welding using the thermoplasticity of a material, there is Patent Document 1 (hereinafter referred to as a prior example). This prior example is an apparatus for high-frequency welding hard vinyl chloride or the like when performing heat insulation / cold insulation exterior construction, and its configuration is shown in FIG. 2 of the previous example, but if the welding surface is enlarged, FIG. can get. In addition, it has shown linearly for convenience of drawing. One end of the thermoplastic resin sheet 23 is inserted from the right side between the upper layer plate 21 and the middle layer plate 22 of the lower heating part that performs welding by high frequency heating, and the thermoplasticity from the left side is interposed between the middle layer plate 22 and the lower layer plate 24. The other end of the resin sheet 23 is inserted and supported. Thereafter, the welding is performed by pressing the upper heating part 25 downward as described in detail in the preceding example.

However, both ends of the thermoplastic resin sheet 23 must be fixed and supported immediately before pressing the upper heating portion 25 downward. For this purpose, both ends of the thermoplastic resin sheet 23 are inserted between the upper layer plate 21, the middle layer plate 22, and the lower layer plate 24 as described above, and are pressed and supported by the three plates. The part needs to exist. For this reason, if the situation after the completion of welding is examined, this supported portion remains as a remaining portion. FIG. 3 shows this situation as a cross-sectional view. A black-filled portion 31 is a welded portion, and an upper residual portion is indicated by 32 and a lower residual portion is indicated by 33, respectively.

Next, if only the thermoplastic resin sheet 23 is left after the welding is completed, and the upper layer plate 21, the middle layer plate 22 and the lower layer plate 24 supporting the lower heating portion are pulled out, the remaining portions 32 and 33 lose support. Therefore, it becomes a free end, and the remaining part 32 at the upper part of the welding surface jumps upward, and the remaining part 33 at the lower part of the welding surface hangs down to the hollow part of the joint part, that is, the lower part of the welding surface. This situation is shown in FIG.

2, 3, and 4 are enlarged views of the vicinity of the weld surface, and FIG. 5 is a cross-sectional view of the joint portion actually manufactured using the cited example. And the upper residue part 32 and the lower residue part 33 exist before and behind the welding part 31. FIG.

In FIG. 5, the upper residual portion 32 is an unnecessary protrusion because it is outside the cylindrical joint portion, causing problems such as an obstacle when clamping with the bands 14 and 15 described in FIG. Let Furthermore, since the lower residual part 33 becomes a protrusion which exists inside the joint part which makes a cylindrical shape, it becomes an obstacle of powder or liquid transported inside. As a result, it is clear that powder and liquid are clogged. Furthermore, since it becomes a powder or liquid resistance material, it is torn apart and becomes a foreign substance. Foreign matter contamination becomes a serious problem in the aforementioned pharmaceutical factories and food factories.

Obviously, it is very difficult to remove such protrusions after welding is completed. Even if it can be removed to some extent, a protrusion remains around the welded portion, and a gap remains between the inner wall of the tube and the remaining protrusion. The powder or liquid transported inside the gap stays in this gap and changes in quality over time, which also becomes a serious problem. Therefore, even if the above-described joint portion is manufactured according to the preceding example, it cannot be put into practical use.

In view of the above situation, the present invention supports a workpiece so as to prevent generation of a residual portion accompanying the welded portion. The welding process according to the present invention is as follows.
Step 1: A step of installing the lower sheet support plate on the upper portion of the lower heat plate so that a gap is located at the convex portion of the lower heat plate,
Process 2: The process of making the edge part of a sheet-like thermoplastic member overlap each other,
Step 3: installing the overlap portion of the thermoplastic member between the convex portion of the upper hot plate and the convex portion of the lower hot plate,
Step 4: Installing the upper sheet support plate at the lower portion of the upper hot plate so that the gap is located at the convex portion of the upper hot plate,
Step 5: pressing the convex portion of the upper hot plate to the convex portion of the lower hot plate,
Step 6: A step of heating the upper hot plate and the lower hot plate.
That is, an object of the present invention is to manufacture a joint portion that does not generate a residual portion after welding by improving the work piece support method so that the end portions of the weld portion overlap and support the front and back thereof.

According to the present invention, since the end portion of the welded portion is overlapped in advance, no residual portion is generated in the joint portion, so that it does not become an obstacle when the piping portion is covered and clamped by a band, and is transported. It is possible to manufacture a joint part that does not become a foreign substance mixed in powder or liquid.

It is an example of the joint part which is a connection part of piping. It is the figure which expanded the welding surface by a prior example. The remainder after the welding completion by a prior example is shown. A mode that the remainder after the welding completion by a prior example becomes a free end is shown. It is sectional drawing when a joint part is manufactured by a prior example. It is sectional drawing which shows embodiment of this invention. It is the sketch which took out the heat plate of the lower part by this invention, and the lower sheet | seat support plate which touches it independently, and juxtaposed it. It is the sketch which looked at the form of the preparation work of the welding by this invention from the upper part of the rounded sheet | seat which is the said workpiece. 1 shows an overall configuration of a welding processing apparatus for performing welding work according to the present invention. 3 illustrates another embodiment of the present invention. 3 illustrates another embodiment of the present invention. The embodiment which made the processing apparatus by this invention portable is shown.

  In this embodiment, polyethylene, which is a thermoplastic resin, is used as the material of the workpiece. In order to support the thermoplastic resin sheet, which is a workpiece, without generating a residue during welding, it is necessary to install a sheet support plate. This sectional view is shown in FIG. As shown in FIG. 6, the cross-sectional shape of the upper hot plate 61 and the lower hot plate 62 that perform heating and pressing is convex, and the width of the overlap portion 63 of the workpiece is the convex portion 61-1 of the hot plate and The width of the hot plate which is substantially the same as the width of 62-1 and does not contact the overlap portion is set to a width sufficient to accommodate the heater for heating. Next, the upper sheet | seat support plate 64 surrounding the convex part 61-1 of the upper heat plate 61 is installed. Since FIG. 6 shows a cross-sectional shape, the sheet support plate 64 is divided into two parts. These are the left cross section and the right cross section of the same object, and the relationship is shown in FIG. it is obvious. Similarly, the lower sheet support plate 65 is installed so as to surround the convex portion 62-1 of the lower heat plate 62.

FIG. 7 is a sketch in which a lower heating plate 62, which is one of the heating plates, and a lower sheet support plate 65 in contact with the lower heating plate 62 are independently taken out and juxtaposed. As shown in the figure, the lower sheet support plate 65 is provided with a gap 71 so as to substantially fit the convex portion 62-1 of the lower heat plate 62, and the lower sheet support plate 65 is used in actual use. Is loaded on the lower heat plate 62, the lower end support plate 65 supports the left end 23-1 and the right end 23-2 of the workpiece 23 as shown in the cross section of FIG. In FIG. 7, a rod 72 is provided to support the hot plate 62 during the welding process. The dial gauge 73 has a function of setting and displaying the temperature of the heater stored in the hot plate 62.

In order to weld the left end 23-1 and the right end 23-2 of the workpiece 23, the workpiece 23 (hereinafter referred to as a sheet) must be supported from above and below as shown in FIG. I must. For this purpose, preparatory work is required, and its form is shown in FIG. 8 as a sketch from the top of the rolled sheet 23 which is the workpiece. The rolled sheet 23 as the workpiece is supported on the lower sheet support plate 65 by metal backing plates 81-1 and 81-2 and clips 82-1 to 82-4. The overlap part 63 is shown in the upper part of the lower sheet support plate 65.

The preparatory work is performed using the work table 83 in FIG. The rolled sheet 23 as the workpiece is placed on the work table 83, and the overlap part 63 is placed on the work table 83. The overlap portion 63 is supported by the lower sheet support plate 65 and the contact plates 81-1 and 81-2, but has a strip shape having a width substantially equal to the width of the convex portion 62-1 of the lower heat plate 62. And At this time, the sheet is rolled and supported, and the desired joint portion 13 can be obtained by subsequently welding the overlap portion 63 by the welding operation shown in FIG. In the final stage of the preparatory work, the lower heat plate 62 floated by the operator holding the spacer (not shown) and the rod 72 with the overlap part 63 facing upward is moved so as to be inserted therein. FIG. 8 shows the final stage of this preparatory work, and shows a state in which the sheet support plate is fitted to the convex portion 62-1 of the lower heating plate 62, and a part of the convex portion 62-1. Can be observed in FIG.

FIG. 9 shows an overall configuration of a welding processing apparatus for performing a final welding operation. In FIG. 9, the upper hot plate 61 and the lower hot plate 62 are provided with supporting points 93-1 and 93-2 by arms 92-1 and 92-2 installed so as to freely rotate around the support pole 91. It is coupled to the support pole 91 via the via. The heights of the upper hot plate 61 and the lower hot plate 62 are adjusted by loading the arms 92-1 and 92-2 on appropriately prepared spacers (not shown). 94 is a lead wire for supplying electric power for the electric heater to the upper hot plate 61 and the lower hot plate 62, and 95 is a controller for controlling the heating temperature. In addition, it can be understood that the form shown in FIG. 8 is obtained by inserting the rolled sheet 23 as the workpiece into the lower heating plate 62.

In the final welding operation, in the state of FIG. 8, the operator lowers the upper hot plate 61 from the upper side to approach the overlap portion 63, and then attaches the upper sheet support plate 64 to the upper hot plate 61. Then, the operator operates the rod 96 to press and weld the overlap part 63. After the upper hot plate 61 is raised after welding, the welding operation is completed by pulling out the rolled sheet 23 as the workpiece. In addition, when the thickness of the sheet to be used is thick and the width of the overlap portion has to be widened to increase the adhesive strength of the adhesive surface, the position of the sheet is gradually shifted in the length direction. The welding operation may be repeated several times. Similarly, when the thickness of the sheet to be used is thick and there is a possibility that the material conveyed through the joint portion may leak due to a step difference in the welding surface, the step difference may be eliminated by appropriately chamfering the welding surface.

Although the above embodiment shows the case where the cylindrical joint portion 13 is manufactured, the embodiment of the present invention can manufacture not only a simple cylindrical joint portion but also a tapered joint portion. That is, the present invention can be easily implemented even when the diameters of the pipe 11 and the pipe 12 in FIG.

Moreover, according to the said Example etc., the use after welding is processing the to-be-processed object in the said joint part 13, ie, a cylindrical shape. However, it goes without saying that the present invention is not limited to processing a workpiece into a cylindrical shape. FIG. 10 shows an embodiment of the present invention in the case where the workpiece is a flat plate, and shows a mode in which the left sheet material 101 and the right sheet material 102 are welded by the overlap portion 63. Also in this case, since there is no remaining portion as shown in FIG. 4, there are few steps in the welded portion, and various effects are expected. Needless to say, the present invention can be applied to an intermediate form between a cylindrical shape and a flat plate shape, that is, a general cylindrical object or a curved plate shape.

Further, FIG. 11 shows a situation in which the overlap portion 63 is not perpendicular to the left-right direction of the sheet but is inclined, as is clear when compared with FIG. This method can also be applied to the production of the joint part 13. In this case, a slight step generated by the overlap part 63 is distributed not only in one place in the circumferential direction but also over a certain range. Leakage is expected to be reduced even when the particle size is small.

Although what is shown in FIG. 9 assumes a stationary type, it can also be configured as a portable type. FIG. 12 shows an example of the portable embodiment, in which casters 1201 are attached to the lower part of the welding processing apparatus shown in FIG. By making it portable, the joint part 13 is transported to the site of the chemical factory or food factory where the joint part 13 is installed by a small truck and human power, etc. An additional effect is exhibited that welding can be performed so as to best fit the actual pipes 11 and 12.

In the above-described embodiment, each processing step is advanced by an operator, that is, manually. However, in order to perform efficiently, each may be automated, and the same effect as in the previous embodiment is exhibited. Needless to say.

In Examples 1 to 5, polyethylene, which is a thermoplastic resin, is used as the material of the workpiece. However, in addition to polyethylene, the material of the workpiece is a thermoplastic resin such as polypropylene or polyvinyl chloride, or a thermoplastic elastomer such as styrene, olefin, vinyl chloride, urethane, ester or amide. It is clear that there is a similar effect.

The contents described so far have been the welding processing apparatus and method of the thermoplastic member, but the workpiece manufactured by the welding processing apparatus or the welding processing method also has the remaining portion, which is a feature of the present invention only by the present invention. It is clear that the characteristics of the present invention are manifested. The processed product is related to all products including those having a cylindrical shape, a flat plate shape, and a curved plate shape.

As described above, according to the present invention, in a chemical factory or a food factory, a sheet of a thermoplastic resin or a thermoplastic elastomer that connects piping for conveying raw materials or products that are powdered or liquid is used as a member. In joint parts manufactured by welding, it is possible to manufacture joint parts that do not become obstacles when covering and clamping with piping and surrounding with a band, and that do not become foreign substances mixed in powder or liquid to be conveyed. .

DESCRIPTION OF SYMBOLS 11 Piping 12 Piping 13 Joint part 14 Band 15 Band 21 Upper layer board 22 of lower heating part Middle layer board 23 of lower heating part Work piece 23-1 Left end 23-2 Work piece Right end 24 Work piece right end 24 Lower plate 25 Upper heating part 31 Welding part 32 Upper residual part 33 Lower residual part 61 Upper hot plate 61-1 Upper hot plate convex part 62 Lower hot plate 62-1 Lower hot plate convex part 63 Overlap part 64 Upper sheet Support plate 65 Lower sheet support plate 71 Lower sheet support plate gap 72 Lower heat plate rod 73 Dial gauge 81-1 Contact plate 81-2 Contact plate 82-1 to 82-4 Clip 83 Work table 91 Support pole 92-1 Arm 92-2 Arm 93-1 Support point 93-2 Support point 94 Lead wire 95 Heating temperature control controller 96 Rod of upper hot plate 101 Sheet material 102 Sheet material 1 01 caster

Claims (4)

The end of a thermoplastic member formed into a sheet and made of polyethylene, polypropylene, polyvinyl chloride, or any one or more of styrene, olefin, vinyl chloride, ester, and amide thermoplastic elastomers An upper hot plate and a lower hot plate for heat-welding portions where the portions are overlapped with each other, and an overlapping portion of the thermoplastic member provided in a portion facing the upper hot plate and the lower hot plate, respectively. A convex part that presses and heats, a lower sheet support plate that is arranged with a gap at the position of the convex part of the lower heat plate, and a gap at the position of the convex part of the upper heat plate An apparatus for heat welding a thermoplastic member, comprising an upper sheet support plate arranged. The lower sheet support plate is installed on the upper portion of the lower hot plate so that the gap is located at the convex portion of the lower hot plate, and is formed into a sheet shape, and polyethylene, polypropylene, polyvinyl chloride, or A step of overlapping ends of thermoplastic members made of any one or more of styrene, olefin, vinyl chloride, ester, and amide thermoplastic elastomers, and the overlap of the thermoplastic members A gap between the convex portion of the upper hot plate and the convex portion of the lower hot plate, and the upper sheet support plate is positioned below the upper hot plate and the gap is located at the convex portion of the upper hot plate. A step of pressing the convex portion of the upper hot plate against the convex portion of the lower hot plate, and a step of heating the upper hot plate and the lower hot plate. Thermal fusion bonding method of plastic member. The lower sheet support plate is installed on the upper portion of the lower hot plate so that the gap is located at the convex portion of the lower hot plate, and is formed into a sheet shape, and polyethylene, polypropylene, polyvinyl chloride, or A step of overlapping ends of thermoplastic members made of any one or more of styrene-based, olefin-based, vinyl chloride-based, urethane-based, ester-based, and amide-based thermoplastic elastomers; and A step of installing the overlap portion between the convex portion of the upper hot plate and the convex portion of the lower hot plate; and the upper side sheet support plate at the lower portion of the upper hot plate at the position of the convex portion of the upper hot plate Is installed through a step of placing the convex portion of the upper hot plate on the convex portion of the lower hot plate, and a step of heating the upper hot plate and the lower hot plate. Workpiece, characterized in that. Thermoplastic made of polyethylene, polypropylene, polyvinyl chloride, or any one or more of styrene, olefin, vinyl chloride, urethane, ester, and amide thermoplastic elastomers in the form of a sheet An upper hot plate and a lower hot plate for heat-welding the portions where the end portions of the members overlap each other; and provided in opposing portions of the upper hot plate and the lower hot plate; A convex part that presses and heats the overlap part, a lower sheet support plate that is disposed with a gap at the position of the convex part of the lower hot plate, and a gap at the position of the convex part of the upper hot plate and an upper side sheet support plate which is disposed with a thermoplastic, characterized in that configuring the portable further, by placing a wheel in the lower Thermal fusion bonding apparatus of the wood.

Images