JPS6137093B2 - - Google Patents

Abstract

PURPOSE:To provide a welding device which prevents the occurrence of deviation of a welded part, the reduction in strength and the exercise of a forcible force on an object to be welded, by a method wherein the welded part of the object to be welded is regulated by a position regulating device having a specified structure. CONSTITUTION:Position regulating devices 7, which regulate a position of a welding part at a time when an object 15' to be welded, being held by a press board, is welded, are mounted around the object 15' to be welded. The position regulating device 7 is positioned so that it can be moved by working cylinders 9, 9', and pressing members 8, 8 press a spot in the proximity of a welding part to regulate a position. It is advisable that a protruberant press part is formed in the proximity of the upper end part of the press member, or the welding part of the object to be welded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a welding apparatus. Specifically, the present invention relates to a welding device suitable for welding so-called large synthetic resin molded products having a large welding area.

It has been conventional practice to weld multiple synthetic resin molded products, such as molded products obtained by injection molding, extrusion molding, etc., to obtain products, and welding devices with various structures are used depending on the product. ing.

Usually, this type of welding device has a holding mechanism that holds the molded products to be welded facing each other, a heating mechanism that melts the welding surfaces of the molded products, and a butt between the molded products whose welded surfaces have been melted. It consists of a pressing mechanism that presses and welds.

When performing welding using such a device, welding is especially important when the molded product to be welded is large, the welding area is large, and the width of the welding surface is narrow, for example, when welding the ends of plate-shaped objects together. In the case of molded products, etc., due to differences in warpage and shrinkage between molded products, the positions of the molded products to be welded may shift from each other, resulting in a major problem in that the strength of the welded part decreases.

In view of these problems, the inventors of the present invention have conducted various studies, and as a result, have solved the problem by regulating the welded part of the welded object using a position regulating device with a special structure, and have completed the present invention. I've reached it.

That is, the gist of the present invention is to provide a welding device comprising a pair of opposing press plates that hold each of the objects to be welded, and a heating plate provided between the press plates so as to be movable back and forth. Press the vicinity of the welding part of the welded object from the side of the welded object,
The present invention resides in a welding device characterized by being provided with a position adjustment device that aligns the positions of welded portions of respective objects to be welded.

An example of the welding apparatus of the present invention will be explained in more detail with reference to the drawings.

FIG. 1 is a schematic explanatory view showing a side view of an example of the apparatus of the present invention, FIGS. The figure is a plan view of a quarter of the pressing plate shown in Figure 2, Figure 4 is a sectional view taken along line AA in Figure 3, and Figure 5 is a sectional view taken along line AA in Figure 3.
The figure is a sectional view taken along line B-B in Figure 4, Figure 6 is a drawing similar to Figure 4 showing another example of the position adjustment device, and Figure 7 is a quarter plan view showing another example of the position adjustment device. ,
Fig. 8 is a cross-sectional view taken along the line C-C in Fig. 7, Fig. 9 is a drawing similar to Fig. 8 showing another example of the position adjustment device, and Fig. 10 I to H are similar to Figs. 7 and 8. A step-by-step explanatory diagram showing an example of the process of welding a molded product using the shown device, FIG. 11 shows a state in which the pressing member of the position adjustment device shown in FIGS. 7 and 8 is in contact with the molded product A partially enlarged vertical cross-sectional view is shown, respectively.

In the figure, 1 is a welding device, 2 and 2' are press plates, 3,
3' is a floating plate, 4 is a frame, 5, 5' are pressing cylinders, 6, 6' are guide rods, 7, 7' are position adjustment devices, 8, 8' are pressing members, 9, 9' are An operating cylinder, 10 and 10' are locking tools, 11 is a heating plate, 12 is a roller, 13 is a motor, 14 is a spacer, 15 and 15' are objects to be welded, and 16 is a guide plate.

As schematically shown in FIG. 1, the welding apparatus 1 of the present invention includes a pair of opposing pressing cylinders 5,
Pressing plates 2, 2' that can be reciprocated by 5'
and a heating plate 11 which is movable forward and backward by an electric motor 13 and rollers 12 between the pressing plates 2 and 2'.

A unique part of the welding device 1 of the present invention is the position adjustment devices 7, 7' provided on the press plates 2, 2'.

The position adjustment devices 7, 7' consist of pressing members 8, 8' and operating cylinders 9, 9', and are provided on opposite sides of the pressing plates 2, 2'.

In FIG. 1, floating plates 3 and 3' (plate-like bodies that can be opened and closed at a predetermined distance from the pressure platen 2) are installed on opposing sides of the pressure plates 2 and 2', and this flow Taing Plate 3,
By providing the position adjusting devices 7, 7' on the press plates 2, 2', the position adjusting devices 7, 7' are indirectly provided on the press plates 2, 2'.

The position regulating devices 7, 7' are for regulating the position of the welded parts during welding of the welded objects 15, 15' held on the press plates 2, 2', and the movable press member 8 , 8' and operating cylinders 9, 9' for moving the pressing members 8, 8'.

The pressing members 8, 8' of the position regulating devices 7, 7' do not adjust the position of the welded objects 15, 15' held by the pressing plates 2, 2' in the vicinity of the pressing plates 2, 2'; The welding parts 15, 15' are pressed near the welding part in order to position the welding part at a distance from the pressing plates 2, 2'.
Preferably, a protruding pressing portion is formed at the upper end of the weld 8', that is, near the welding portion of the objects 15, 15'.

Of course, the position adjustment devices 7, 7'
15' to surround the object to be welded, but if the object to be welded is rectangular or the like, it is sufficient to provide it at the main part such as the square part and the center of the four sides. Further, the pressing members 8, 8' moved by the actuating cylinders 9, 9' are position adjusting devices 7,
7', but it is preferable that at least one of the position adjusting devices located opposite each other is movable by actuating cylinders 9, 9'.

Next, an example of a process for welding a synthetic resin molded product using the apparatus of the present invention will be explained using FIGS.

The objects 15 and 15' to be welded shown in the drawing have the shape of a synthetic resin pallet divided into upper and lower halves, and each is a large molded product with a length and width of about 1 m and a thickness of about 7 cm.

Figure 2 A: Pressing plate 2 in the open state,
The objects to be welded 15, 15' are stacked and placed between 2'.

FIG. 2B: Due to the action of the pressing cylinders 5, 5', the pressing plates 2, 2' move so as to shorten the distance from each other.

When the press plates 2, 2' cover the welded objects 15, 15', the locking tools 10, 10' operate, and the welded objects 1
5, 15' are locked. Furthermore, a position adjustment device 7,
7' is operated to regulate the position of the welded portion of the objects 15, 15'. The position regulating devices 7, 7' press the vicinity of the welded parts of the welded parts 15, 15' so that the positions of the welded parts of the welded parts 15, 15' match well. Therefore, if the sizes of the welded objects 15, 15' are slightly different, the pressing force applied to the welded objects will be different.

The locking tools 10, 10', whose plan view is shown in FIG.
A tongue-shaped presser plate can be moved forward and backward from the side of 5'. The object to be welded can be held between the holding plate and the pressing plate (or floating plate).

Figure 2 C: By opening the press plates 2 and 2',
The objects to be welded 15 and 15' are separated into upper and lower parts, and a heated heating plate 11 (usually having a built-in heating mechanism such as an electric heater) enters between them.

FIG. 2D: By moving the press plates 2, 2' again in a direction to shorten the distance between them, the object to be welded comes into close contact with the heating plate 11, and its surface is melted.

At this time, the gaps between the floating plates 3, 3' and the pressing plates 2, 2' are closed, and there is a predetermined height between the floating plates 3, 3' and the heating plate 11. spacer 14,1
4' are sandwiched, and the welded parts 15, 15' are held at a constant height and the welded parts are melted.

Figure 2 E: Pressing plates 2, 2' open again, but at this time, even if pressing plates 2, 2' begin to move, floating plates 3, 3' do not move at the same time, and the floating plates 2, 2' do not move at the same time. After a predetermined gap has been left between them, they are caught on the pressing plate and begin to move. That is, the pressing plate 2,
After the 2′ gains a certain initial velocity, it floats.
The plates 3, 3' will be pulled up with an impact. This high-speed separation of the welded objects 15, 15' from the heating plate 11 prevents the molten thermoplastic synthetic resin from adhering to the heating plate 11.

Fig. 2 F: Heating plate 1 after pressing plates 2 and 2' open
1 leaves.

FIG. 2G: The pressing plates 2, 2' again shorten the distance, and the objects 15, 15' to be welded are welded.

Let the welded part solidify to some extent in this state. That is, it is preferable to solidify the welded portion until it does not shift or come off even if subsequent operations are performed. Of course, during this welding, the position regulating device 7,
7' works to adjust the welded portions of the objects 15, 15' to a predetermined position.

Fig. 2 H: After the welded part has solidified, the locking tool 10, 1
0', the position adjustment devices 7, 7' move back, and the press plates 2,
2' is opened and the welded molded product is released.

As shown in plan view in FIG. 3, the position adjusting devices 7, 7' are provided around the objects 15, 15' to be welded, and are movable by operating cylinders 9, 9'. FIG. 4 is a cross-sectional view taken along line A-A in FIG. 3, showing a state in which the pressing members 8, 8' are pressing the vicinity of the welded part and adjusting the position. FIG. 5 is B in FIG. 4. -B sectional view, in which the guide plate 16 is installed so that the pressing members 8, 8' maintain accurate positions.
The figure shows a structure guided by.

FIG. 6 shows a modification of the pressing members 8, 8', which press the sides of the objects 15, 15' to be welded with a wide surface. In the case of such pressing members 8, 8', the pressing force must be large, but when pressed by the pressing members 8, 8', the welded objects 15, 1
5' can be prevented from floating up from the pressing plates 2, 2' (or floating plates 3, 3').

The one shown in FIGS. 7 and 8 is another example of a position regulating device, in which a substantially U-shaped pressing member 8 is provided at the tip of an operating cylinder 9.

In this case, the pressing member 8 is activated when the objects to be welded held on the pressing plate 2 are butted together for welding,
The welding parts 15 and 15' are pressed in the vicinity of the welded parts of the welded parts 15 and 15' across the welded parts. The substantially U-shape includes variations such as a horizontal U-shape and a V-shape.

FIG. 9 shows a modification of the pressing member 8 shown in FIG. 8, which presses the sides of the welded object over a wide range.

FIGS. 10A to 10E illustrate the process of welding a synthetic resin molded product using the apparatus shown in FIGS. 7 and 8.

The process of placing the objects to be welded 15, 15' on the pressing plates 2, 2', holding them, and then melting them on the heating plate 11 is almost the same as the process explained in FIG. {Fig. 10 A to C} As shown in Fig. 10 D, when the welded objects 15, 15' whose surfaces are melted approach to be welded, the U-shaped pressing member 8 is activated and the welded objects are 15,1
Just before the parts 5' are butted together, the vicinity of the welded part is pressed to correct the position, and welding is performed as shown in FIG. 10E.

Welding objects 15, 15' and U-shaped pressing member 8
FIG. 11 shows the timing relationship.

In other words, the pressing member 8 presses the object 1 to be welded too quickly.
5, 15' is undesirable because it comes into contact with the molten resin layer formed on the surface of the welded members 15, 15' and deforms the molten resin layer. , 15' are abutted against each other, it is not preferable for the pressing member 8 to come into contact with the object to be welded because the welded portion will be displaced. For this reason, the U-shaped pressing member 8
It is necessary that the welding part 5' is on the inside of the U-shape and comes into contact with the welded object in a state where the welded object has not yet butted against each other. Specifically, when the distance a between the welded objects 15 and 15' becomes approximately 5 to 20 mm, the U-shaped pressing member 8 presses the welded object 1.
5 and 15'.

In this way, the U-shaped pressing member 8 does not press and deform the molten resin layer portion or bead portion of the objects 15, 15' to be welded, so that when a simple plate-shaped or block-shaped pressing member is used, There is no possibility that the molten resin part will be deformed under pressure and cause poor welding.

In the apparatus of the present invention, the position at which the pressing members 8, 8' of the position regulating devices 7, 7' press the objects 15, 15' to be welded varies depending on the size of the objects to be welded, etc. For example, in the case of a molded product in which a pallet of about 7 cm is divided into two parts, it is preferable for the pressing member to press at a position about 5 mm to 15 mm away from the welded part in order to prevent deformation of the molten resin layer.

Furthermore, in the above description, the position regulating devices 7, 7'
is constructed to be moved by actuating cylinders 9, 9', but it goes without saying that other mechanisms such as a link mechanism, a cam mechanism, a rotation mechanism, etc. may be employed as the actuating mechanism.

In this way, according to the apparatus of the present invention, the welded object 1
Since the position is adjusted by pressing the vicinity of the welded parts 5 and 15', there is no displacement of the welded parts, and a molded product with very favorable strength can be obtained. Further, since the pressing is performed by directly pressing the vicinity of the welding part of the welded object, a relatively small pressure is required, and there is an advantage that no unreasonable force is applied to the welded object.

FIG. 1 is a schematic explanatory diagram showing a side view of an example of the apparatus of the present invention, FIGS. A plan view of a quarter of the pressing plate shown in Fig. 2, Fig. 4 is a cross-sectional view taken along line A-A in Fig. 3, Fig. 5 is a cross-sectional view taken along line B-B in Fig. 4, and Fig. 6 is a position adjustment device. A drawing similar to FIG. 4 showing another example, FIG. 7 a quarter plan view showing another example of the position adjustment device, FIG. 8 a cross-sectional view taken along line CC in FIG. 7, and FIG. 9. 1 is a drawing similar to FIG. 8 showing another example of the position adjustment device;
Figure 0 I to E are step-by-step explanatory diagrams showing an example of the process when molded products are welded using the apparatus shown in Figures 7 and 8, and Figure 11 shows the positions shown in Figures 7 and 8. FIG. 6 is an enlarged partial longitudinal cross-sectional view showing a state in which the pressing member of the regulating device is in contact with the molded product.

In the figure, 1 is a welding device, 2 and 2' are press plates, and 3 and 3
is the floatywag plate, 4 is the frame,
5, 5' are pressure cylinders, 6, 6' are guide rods,
7, 7' are position regulating devices, 8, 8' are pressing members,
9 and 9' are operating cylinders, 10 and 10' are locking tools, 11 is a heating plate, 12 is a roller, 13 is a motor, 14 is a spacer, 15 and 15' are welded objects, and 16 is a guide plate. .

Claims (1)

[Scope of Claims] 1. In a welding device consisting of a pair of opposing press plates that hold each object to be welded and a heating plate provided between the press plates so as to be movable back and forth, A welding device characterized in that a position adjustment device is provided on the side of the welding object to press the vicinity of the welding section of the welding object from the side of the welding object to align the positions of the welding sections of each welding object with each other. . 2. According to claim 1, the position regulating device has a structure in which the welding parts of the welded objects held on the respective pressing plates are pressed by separate pressing members. The described welding equipment. 3. The position adjustment device uses a substantially U-shaped pressing member to press the welded portion of each welded object in the vicinity of the welded portion, straddling the welded portion, just before the welded objects held on the respective pressing plates are butted together for welding. A welding device according to claim 1, characterized in that the welding device has a structure.