JP4939678B1 - Sheet-like material welding apparatus and method - Google Patents

Abstract

【Task】
In the present invention, when mounting a joint made of urethane rubber or the like in the gap between the pipes, when producing the joint part from a raw material sheet by a welding method in which the joint part is heated by a general-purpose press and then pressed, This solves the problem that powder or the like to be conveyed leaks from the joint portion because it must be provided.
[Solution]
In view of the above-mentioned situation, the present invention uses a dedicated press machine instead of a general-purpose press to remove the lead-out portion by heating and pressing after overlapping the welded portions without providing the lead-out portion. In addition, it is characterized by eliminating the drawbacks of the joints made of urethane rubber or the like.
[Selection] Figure 5

Description

The work piece targeted by the present invention has both elasticity and flexibility, typically urethane rubber, and is difficult to bond with an adhesive. A typical example of the thickness is 1 mm.

In chemical factories and food factories, in order to transport raw materials and products in the form of powder, it is usual to pass 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. If the product is not high-temperature and high-pressure, it is common to manufacture and connect a joint made of synthetic rubber that has 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 has elasticity, so that it can be pulled out with appropriate force. 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.

Typical materials used for the joint portion 13 are synthetic rubber silicon rubber and urethane rubber. Urethane rubber is preferred because it is superior to silicon rubber in terms of wear resistance at room temperature with respect to the powder and is cheaper than silicon rubber. In particular, due to the feature of high wear resistance to the powder, the joint portion is hardly worn and mixed as a foreign substance in the powder to be conveyed, which is also very preferable in this respect.

Japanese Utility Model Laid-Open No. 5-22663

However, a problem with urethane rubber is that it is difficult to bond with an adhesive. For this reason, a method in which both sides of the sheet are welded by heating to about 150 ° C. is applied for joining the urethane rubber. For example, for use in the joint portion 13 shown in FIG. 1, a urethane joint can be manufactured by, for example, rounding a 1 mm thick urethane rubber sheet and welding both ends. there were.

That is, in order to roll and weld the sheet,
Step 1: Rounding the sheet into a pipe,
Process 2: The process of supporting the rolled sheet,
Process 3: The process of extracting the welded part,
Step 4: Pressing and heating the welded portion to weld,
It is necessary to go through these four steps, but the above-mentioned step 3: the step of extracting the welded portion,
There was a problem. This is because there is no dedicated machine for welding urethane rubber, so a hot plate of a general-purpose hot press machine was used, but there was only a method of welding by making a lead-out part outside the pipe.

This situation will be described with reference to FIG. FIG. 2 is a cross-sectional view illustrating a situation in which the joint portion 13 in FIG. 1 is manufactured using the general-purpose heating press. In order to manufacture the joint portion 13 in FIG. 1, a lead portion 22 that is in contact with the upper and lower sides is generated from a sheet 21 that is a workpiece to be rolled as shown in FIG. The joint portion 13 in FIG. 1 can be manufactured by sandwiching and pressing between the upper hot plate 23 and the lower hot plate 24 loaded in the press machine.

However, as is apparent from FIG. 2, it is inevitable that the depressed portion 25 occurs on the back side of the lead portion. The depressed portion 25 is a welded portion when the welded portion, that is, the lead-out portion 22 is clamped by being surrounded by the bands 14 and 15 so as to cover the two piping portions 11 and 12 as the joint portion 13 in FIG. In other words, the powder and the like to be conveyed leak from the gap, and the joint made of urethane rubber has not been widely used. Furthermore, when the diameters of the two pipe portions 11 and 12 to be connected are not the same, it is extremely difficult to form a joint portion. The present invention solves the problem that powder or the like to be conveyed leaks from the joint portion because it must be manufactured by welding when applying a joint made of urethane rubber or the like.

In view of the above situation, the present invention is to eliminate the drawbacks of the joint made of urethane rubber or the like by using a dedicated welding processing apparatus instead of a general-purpose heating press. This step is the above-mentioned step 3: the step of extracting the welded portion in the conventional step,
Instead of
Step 3A: a step of overlapping welds,
And the leakage of conveyed powder and the like due to the presence of the lead-out portion has been removed. Further, the step 3A and the subsequent step 4: the step of pressing and heating the welded portion to weld,
The shape of the press and the heating unit is improved in order to smoothly execute the above.

According to the present invention, the welded portion is overlapped in advance to remove leakage of conveyed powder due to the presence of the lead-out portion, and the urethane rubber having excellent wear resistance and relatively low cost is added to the joint. Can be easily applied to the part.

It is an example of the joint part which is a connection part of piping. It is sectional drawing showing the condition which manufactures a joint part using a general purpose heating press. The concept of the welding method by this invention is shown as a cross-sectional shape. It is sectional drawing which shows the principle of the heating and press method of the welding part by this invention. It is sectional drawing which shows final 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 21 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 this invention portable is shown.

FIG. 3 shows the concept of the welding method according to the present invention as a cross-sectional shape. As shown in FIG. 3, in the present invention, after rounding the urethane rubber sheet 21, which is a workpiece to be welded, an overlap portion 31 is provided instead of the lead-out portion 22 shown in FIG.

4 shows the principle of the method for pressing and heating the welded portion according to the present invention as a cross-sectional view in the vicinity of the overlap portion 31 in FIG. By overlapping the sheets without providing a lead-out portion and making the wrap width and the width of the heat plate substantially equal, the welded portion becomes almost flat, and a joint portion 13 close to a circle can be manufactured. The drawbacks due to the production method were eliminated.

That is, in FIG. 4, hot plates 41 and 42 for heating and pressing are provided above and below the overlap portion 31, and the width of the overlap portion 31 is set to the width of the hot plates 41 and 42 as shown in FIG. The overlap portions 31 of the left end 21-1 and the right end 21-2 of the rounded urethane rubber sheet, which is a workpiece, are heated and pressed by the hot plates 41 and 42 to be welded. As a result, the welded portion is almost flat, and the desired joint portion 13 is obtained. Although not shown, it will be understood that when the overlap portion 31 is observed from its upper surface, the shape thereof becomes a band shape.

However, there was a problem in implementation when manufacturing according to the principle shown in FIG. That is, it is desirable that the overlapping width and the width of the hot plate be as small as possible within the range in which the welding strength can be ensured, but if it is small, it becomes difficult to support the sheet. For this reason, for the final implementation, the overlap width and the width of the hot plate are made as small as possible, and a sheet support plate is added to make the width sufficient to support the sheet. It was necessary to install. This sectional view is shown in FIG.

As shown in FIG. 5, the cross-sectional shape of the hot plates 41 and 42 to be heated and pressed is convex, and the width of the overlap portion 31 of the workpiece is set to the convex portions 41-1 and 41-2 of the hot plate. The portion of the hot plate that is substantially the same as the width 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 51 surrounding the convex part 41-1 of the upper heat plate 41 is installed. Since FIG. 5 shows a cross-sectional shape, the sheet support plate 51 is divided into two parts, which are a left cross section and a right cross section of the same object, and the relationship is shown in the following sketch in FIG. it is obvious. Similarly, the lower sheet support plate 52 is installed so as to surround the convex portion 42-1 of the lower heat plate 42.

FIG. 6 is a sketch in which the lower heating plate 42, which is one of the heating plates, and the lower sheet support plate 52 in contact with the lower heating plate 42 are independently taken out and juxtaposed. As shown in the drawing, the lower sheet support plate 52 has a hole 52-1 so as to be almost fitted in the convex portion 42-1 of the lower heat plate 42. By loading the support plate 52 on the hot plate 42, the lower sheet support plate 52 supports the left end 21-1 and the right end 21-2 of the workpiece 21 as shown in FIG. . In FIG. 6, the rod 61-2 is provided to support the hot plate 42 during the welding process. The dial gauge 61-3 has a function of setting and displaying the temperature of the electric heater housed in the hot plate 42.

In order to weld the left end 21-1 and the right end 21-2 of the workpiece 21, the workpiece 21 must be supported from above and below as shown in FIG. 5. For this purpose, preparatory work is required, and its form is shown in FIG. 7 as a sketch from the top of the rolled sheet 21 that is the workpiece. The rolled sheet 21 as the workpiece is supported on the lower sheet support plate 52 by metal rulers 71-1 and 71-2 and clips 72-1 to 72-4. The overlap portion 31 is shown in the upper part of the lower sheet support plate 52.

The preparatory work is performed using the work table 73 in FIG. The rolled sheet 21 that is the workpiece is placed on the work table 73, and the overlap portion 31 is placed upward. The overlap portion 31 is supported by the lower sheet support plate 52 and the rulers 71-1 and 71-2, and has a strip shape having a width substantially equal to the width of the convex portion 42-1 of the lower heat plate 42. To do. At this time, the sheet is rolled and supported, and the desired joint portion 13 can be obtained by welding the overlap portion 31 by the welding operation shown in FIG. In the final stage of the preparatory work, the lower heat plate 42 floated by the operator holding the spacer (not shown) and the rod 61-2 with the overlap portion 31 up is moved so as to be inserted therein. To do. FIG. 7 shows the final stage of this preparatory work, and shows a state in which the sheet support plate is fitted to the convex portion of the lower heating plate, and a part of the convex portion 42-1 is shown in FIG. I can observe.

FIG. 8 shows an overall configuration of a welding processing apparatus for performing a final welding operation. In FIG. 8, the upper hot plate 41 and the lower hot plate 42 have fulcrums 83-1 and 83-2 by arms 82-1 and 82-2 installed so as to freely rotate around the support pole 81. It is coupled to the support pole 81 via The heights of the upper hot plate 41 and the lower hot plate 42 are adjusted by loading the arms 82-1 and 82-2 on appropriately prepared spacers (not shown). 84 is a lead wire for supplying electric power for an electric heater to the upper hot plate 41 and the lower hot plate 42, and 85 is a controller for controlling the heating temperature. In addition, it can be understood that the form shown in FIG. 7 is obtained by inserting the rolled sheet 21 as the workpiece into the lower heating plate 42.

In the final welding operation, in the state of FIG. 7, the operator lowers the upper hot plate 41 from the upper side to approach the overlap portion 31, and then attaches the upper sheet support plate 51 to the upper hot plate 41. Then, the rod 61-1 is operated, and the operator presses and welds the overlap portion 31. After the upper hot platen 41 is raised after welding, the welding operation is completed by pulling out the rounded sheet 21 as the workpiece.

Although the above embodiment shows a case where the cylindrical joint portion 13 is manufactured, the implementation of the present invention is extremely difficult not only by a simple cylindrical joint portion but also by a conventional method using a lead portion. Tapered joints can also be manufactured. That is, the present invention can be easily implemented even when the diameters of the pipe 11 and the pipe 12 in FIG. Therefore, the joint portion 13 can be manufactured without using a complicated structure as disclosed in Japanese Utility Model Laid-Open No. 5-22663.

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. 9 shows an embodiment of the present invention in the case where the workpiece is a flat sheet, and shows a mode in which the left sheet material 91 and the right sheet material 92 are welded by the overlap portion 31. Also in this case, since the lead-out portion as shown in FIG. 2 does not exist, it is expected that there are few steps in the welded portion and various effects can be obtained.

Further, FIG. 10 shows a situation in which the overlap portion 31 is not perpendicular to the left-right direction of the sheet but is inclined as is apparent from comparison 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 31 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.

Finally, if the welding processing apparatus according to the present invention whose typical embodiment is shown in FIG. 8 is compared with the conventional heating press machine of the related art, it can be configured to be lightweight and compact because it is a dedicated machine. Can be pointed out. Although what is shown in FIG. 8 assumes the stationary type, since it can be comprised lightweight and compact as mentioned above, it can be comprised as a portable type. FIG. 11 shows an example of the portable embodiment, in which casters 1101 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 or by human power, etc., and because it is elastic, it is difficult to design in advance. 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.

As described above, according to the present invention, in a chemical factory or a food factory, a joint part manufactured by welding using a raw material in powder form or a urethane rubber or the like connecting a pipe for conveying a product. In this case, it is possible to supply a product excellent in wear resistance due to characteristics such as urethane rubber while eliminating leakage of the powder, which can be widely used industrially.

DESCRIPTION OF SYMBOLS 11 Piping 12 Piping 13 Joint part 14 Band 15 Band 21 Work piece 21-1 Left end 21-2 Right end 22 of sheet Outlet part 23 Upper hot plate 24 Lower hot plate 25 Depressed part 31 Overlap part 41 Upper hot plate 41 -1 Convex part 42 of the upper heat plate Lower heat plate 42-1 Convex part 51 of the lower heat plate Upper sheet support plate 52 Lower sheet support plate 52-1 Lower sheet support plate hole 61-1 Lower heat plate rod 61- 2 Lower heat plate rod 61-3 Dial gauge 71-1 Ruler 71-2 Ruler 72-1 to 72-4 Clip 73 Work table 81 Support pole 82-1 Arm 82-2 Arm 83-1 Support point 83-2 Support point 84 Lead wire 85 Heating temperature control controller 91 Sheet material 92 Sheet material 1101 Casters

Claims (2)

An upper hot plate and a lower hot plate for welding portions where end portions of sheet-like thermoplastic members made of urethane rubber are overlapped with each other, and opposed portions of the upper hot plate and the lower hot plate A convex portion that presses and heats the overlap portion of the thermoplastic member, a lower sheet support plate that is disposed with a gap at the position of the convex portion of the lower thermal plate, and the upper portion An apparatus for welding a thermoplastic member, comprising: an upper-side sheet support plate arranged with a gap at the position of the convex portion of the hot plate.
The step of installing the lower sheet supporting plate on the upper portion of the lower hot plate so that the gap is positioned at the convex portion of the lower hot plate, and the end portions of the sheet-like thermoplastic member made of urethane rubber are mutually connected A step of overlapping, a step of installing the overlap portion of the thermoplastic member between a convex portion of the upper hot plate and a convex portion of the lower hot plate, and an upper sheet support plate at the lower portion of the upper hot plate A step of installing the voids at the positions of the convex portions of the upper hot plate, a step of pressing the convex portions of the upper hot plate against the convex portions of the lower hot plate, the upper hot plate and the lower heat A method of welding a thermoplastic member, comprising the step of heating the plate.

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