JPS6130832Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a welding device for synthetic resin products, mainly synthetic resin pallets.

Conventionally, synthetic resin products can be welded with various cross-sectional structures, and the welding method generally used is the method shown in FIGS. 1 and 2.

That is, in FIG. 1, parts 5 and 6 are welded together on mounting stands 3 and 4 which are horizontally operated by cylinders 1 and 2.
Holding tool 7, so that the welding surfaces 5a, 6a of
8 or the like, and insert a hot plate 9 between the welding surfaces 5a and 6a of both parts, which can be brought into close contact with both surfaces at the same time, and press both parts against this to reach a certain partial melting state of the welding surfaces 5a and 6a. After that, the hot plate 9 is raised and pressed again to perform integral welding.

In addition, an example of the welding method for the pallet shown in Fig. 2 is shown, in which horizontally divided parts are overlapped and their overlapping surfaces are welded together, and the fork insertion holes are formed by grooves formed on each overlapping surface. is forming. This involves fixing welded parts 12 and 13 to the opposing surfaces of mounting bases 10 and 11 having vertically horizontal opposing surfaces, and a hot plate 14 similar to the above described between these welding surfaces 12a and 13a.
In this method, the hot plate 14 is inserted in the horizontal direction and operated to press the mounting base against each other from above and below to heat each welding surface, and then the hot plate 14 is removed and crimped.

However, with these conventional welding methods and devices, the size of the molding die and molding machine have increased due to the increase in the size of the parts, resulting in a significant increase in product costs, and the inability to weld multiple parts at the same time. There were problems with efficiency, poor dimensional accuracy, and the impossibility of mass production due to the impossibility of welding, and a solution was needed.

This invention aims to provide a welding device that can automate the welding work and solve the above-mentioned problems.

The feature of the welding device of this invention is that each part A ₁ , A ₂ , A ₃ , and A ₄ is divided by intersecting dividing lines X and Y, as shown in FIG. In addition to using multiple welded parts with a total included angle of 360 degrees, the parts mounting base can be moved in the centripetal direction so that all the welded surfaces touch at the same time. In this invention, we will explain an apparatus for forming a synthetic resin product by mutually welding welded parts obtained by dividing a rectangular product shown in Fig. 3 into four equal parts.
The same principle can be easily modified even in the case where the welded parts are divided into 3 to 6 parts as shown in FIG. However, it goes without saying that it is necessary to increase or decrease the number of mounting stands, the number of radiating hot plates, etc. depending on the number of welded parts.

Hereinafter, this invention will be explained based on the illustrated embodiment. FIG. 5 is a partially cutaway plan view showing an outline of the welding device according to this invention, and FIGS. 6 and 7 are FIGS. 5A-A. In the view taken along the line and B-B, four poles 42 are installed on a bed 41 on which various devices are placed, and a pedestal 43 is installed diagonally above the poles 42.
is installed to form the main body (frame) 44 of the device. 30 to 33 are parts A ₁ to _{A 4} attached to the mounting base 20 to
23 is a presser to be pressed onto the top, 34 is a presser 30
- 33 is attached to each of the four holders 35 that move (run) in the centripetal direction. It is slidably fitted into two guide bars 36, and its movement in the centripetal direction is guided by the guide bars 36. Reference numeral 37 is a cylinder fixed on the support plate 34 for raising and lowering the pressers 30 to 33. Presser 3
The front and rear parts of the bottom surface of 0 to 33 are
A protrusion 38 is provided that fits into a recess (not shown) on the upper surface of A 1 to A 4 to position the parts A 1 to A 4 on the mounting bases 20 to 23, and _furthermore , a projection 38 is provided _to position the parts A ₁ to A ₄ on the mounting bases 20 to 23.
An adjuster star (stopper) 39 is attached to each opposing side of the upper surface of the part 33, and the adjuster star 39 stops the hot plate when the hot plate 40 is lowered to heat and melt the welding surface of the part. 40
The part A ₁ is placed at the same height as the adjuster star 47 attached to the frame 46 and faces it for melting.
~ When A ₄ is pressed and melted by a predetermined dimension, each adjuster star 39, 47 comes into contact at the same time to prevent further melting and dimensional errors or uneven welding strength when the product is completed. There is. This mechanism can also be implemented by electrical control such as a limit switch.

Since the cylinder 37 for raising and lowering the pressers 30-33 is fixed to the support plate 34 as described above, the pressers 30-33 are driven in the centripetal direction together with the support plate 34.

Reference numerals 20 to 23 are mounting stands corresponding to parts A ₁ to _{A 4} , respectively, the upper surface of which is horizontal, and frames 24 to 27 with movable carts attached to the lower part so that they can move in the centripetal direction. There is. Also,
A guide bar 29 that slidably guides the movement of the mounting frames 24 to 27 is installed horizontally in the diagonal direction between the pole 42 and the support frame 28 so as to penetrate through each frame. At the rear of the upper surface of the mounting bases 20 to 23, a protrusion 48 is attached that positions the component by fitting into a recess on the lower surface of each component A ₁ to _{A 4} when the component is pressed. The protrusion 48 is moved by the cylinder 49 to the mounting base 2 during insertion of parts and removal of products.
It is lowered to the same level as or lower than the upper surface of 0 to 23.

Furthermore, as is clear from FIGS. 5 and 7, a bush 50 is fixed to the lower surface of the mounting bases 20 to 23 on the side adjacent to the other mounting bases (the side where the hot plate 40 is inserted), and is provided adjacently and in parallel. The bush 50 of the other mounting base is connected to the bush 50 by a slidable guide pin 51. The mounting bases 20 to 23 are connected to each other by a slidable guide pin 51 between adjacent mounting bases, and the mounting bases 20 to 23 are connected to each other by a slidable guide pin 51.
is guided by the guide bar 29 so as to travel in the centripetal direction, so for example, if the mounting base 20 moves in the centripetal direction, the adjacent bases 21 and 23 are simultaneously pulled (pushed) by the guide pin 51. At the same time, the movement starts, and therefore the mounting base 22 also moves at the same time as the base 21,
Move while narrowing the distance between you and 23. That is, the mounts 20 to 23 are connected by the slidable guide pin 51 and are driven simultaneously.

In addition to using the guide pin 51 as described above to connect the mounting bases, in place of the guide pin 51, as shown in FIG.
It is possible to form a groove 52 in the shape of a letter and provide a substantially E-shaped guide member 53 that partially fits into the groove 52 in a slidable manner, and it is also possible to easily change it to any other mechanism. Needless to say.

54 is a connecting plate connecting the mounting bases 20 to 23 and the support plate 34, and the connecting plate 54 connects the mounting base 2
0 to 23 and pressers 30 to 33 move integrally. In addition, when the pressers 30 to 33 press the parts A ₁ to _{A 4} , they are integrated with the mounting bases 20 to 23 via the parts, so when the mounting bases 20 to 23 move, the pressers 30 to 33 are also integrated. Therefore, the connecting plate 54 may be provided as necessary.

Next, the driving device for the mounting stands 20 to 23 will be described. Reference numeral 60 is a cam with a guide groove formed on its upper surface, and is rotatably mounted on a mounting frame 61 fixed to the inside of the support frame 28 by a stepped shaft 62. It is provided. Reference numeral 63 denotes a guide groove curved in an arcuate shape from the inside to the outside on the top surface of the cam 60. A pin 64 provided on the bottom surface of the mounting bases 20 to 23 is inserted into the guide groove 63. The guide grooves 63 are fixed so as to be located inside the guide groove 63 when the mounting bases 20 to 23 are pushed in the centripetal direction and pressed against each other, and the guide groove 63 has a length sufficient for moving the mounting bases 20 to 23 back and forth. It is formed of. Furthermore, the mounting frame 61
A substantially doglegged lever 65 is pivotally supported at the bottom of the cam 60, one end of which is fixed to the cam 60 by a screw pin 66, and the other end of which is an operating cylinder fixed to the device body 44. An arm 68 that transmits the power of 67 is pivotally supported.

FIG. 9 shows the relationship between the cam 60, the mounting bases 20 to 23, and the pin 64, and FIG. 10 shows the states of the mounting bases 20 to 23 when they are open and when they are pressed together, using chain lines and dashed-dotted lines. It is something. As is clear from the drawings, the pin 64 is located outside the guide groove 63 when the mounts 20 to 23 are separated at a constant interval. When the arm 68 is pushed by the cylinder 67, the pivoted lever 6
5 rotates, and one end is connected to the cam 6 by a screw pin 66.
Since it is fixed at 0, the cam 60 also starts rotating at the same time as the lever 65 rotates. As the cam 60 rotates, the pin 64 is guided by the guide groove 63 and moves inward. At this time, the mounts 20 to 23 are guided by the guide bar 29, so they perform linear motion. Therefore, when the cam 60 is further rotated, the pin 64 is guided within the guide groove 63, and finally the mounting bases 20 to 23 are completely pressed against each other.

To separate the mounting bases 20 to 23 into the state shown in FIG. 9, the cam 60 is moved in the opposite direction to that in which the mounting bases are pressed together.
Just rotate the

The cam 60 can be rotated by a cylinder as shown in the above embodiment, or alternatively, it can be rotated by a motor.

In addition, the cylinder indicated by the chain line in FIG. 6 shows another embodiment of the drive device for the mounts 20 to 23, and instead of using the cam mechanism as described above, the cylinder is centered at the rear end of each mount 20 to 23. A cylinder for driving the vehicle in the direction is provided, and the mounting bases 20 to 23 are driven by the cylinder. In this case, in a configuration in which the mounts are connected by guide pins, etc., it is not necessarily necessary to separately provide cylinders for travel operation in all the mounts, but it is also possible to have a configuration in which they are provided in one or more mounts. .

Furthermore, the hot plate 40 has a cross shape and is attached to the inside thereof through a hot plate frame 46. The rod of the hot plate driving cylinder 55 is attached to the upper part of the hot plate frame 46. is fixed to the frame 43. Reference numeral 56 denotes a welding surface correction tool attached to the lower end of the hot plate 40, which presses against the bulge of flesh that occurs at each welded part during welding to make it flat, so that the pressing surface is horizontal. It is flat and has its own water cooling mechanism.

Although the heat plate 40 has been described as being integrally molded in a cross shape, a split type heat plate in which each radiation portion is separated may also be used.

Next, referring to the process diagrams and principle diagrams shown in FIGS. 11 and 12, the operation of the device according to the above invention will be explained. First, the welded parts will be welded from the opening.
A ₁ to _{A 4} are inserted and placed on the mounting stands 20 to 23 so that the apex of the included angle formed by the two welding surfaces faces toward the center, and the cylinder 35 is used to hold the presser 30.
- 33 are pressed onto each of the parts A ₁ - _{A 4} and the parts are fixed in position by the protrusion 38 and at the same time by the protrusion 48 pulled up by the cylinder 49.

Then parts A ₁ to _{A 4} before entering the next welding process.
In order to improve the familiarity of welding, the mounts 20 to 23 are horizontally moved centripetally by a drive device, and the adjacent welding surfaces of each part A ₁ to _{A 4} are pressed together once. After that, each mounting base 20 to 23 and parts again
Separate A ₁ to _{A 4} into the state shown in FIG.

Next, the hot plate 40 located at the upper intermediate position of each part _A1 to _A4 is lowered between the facing surfaces of each part, and then the mounting bases 20 to 23 are moved centripetally as shown in FIG. The welding surfaces of the parts A ₁ to _{A 4} are simultaneously pressed against the hot plate 40 by horizontal movement. Mounting stand 2
0 to 23 are connected by a slidable guide pin 51 (guide member 53), so they move at the same speed no matter which embodiment is driven by the drive device. Then, a certain part of the welding surface of each part is heated and melted until it reaches the molten state necessary for welding. When a certain part of the welding surface is melted, the azimuth stars 39 of the pressers 30 to 33 and the azimuth stars 47 provided on the hot plate 40 This prevents the welding surface from melting more than necessary.

When the welding surface is melted in the above work, the mounting base 20~
23 retreats in the opposite direction, the hot plate 40 is raised, and then the mounts 20 to 23 are moved centripetally again to press the adjacent welding surfaces of parts A ₁ to _{A 4} , all at the same time. Weld. Note that if any of the welding surfaces come into contact with each other before the others before this welding, there is a risk that the welding state of the entire product will be uneven, but in this device, the guide pin 51 (guide member 5
3) are slidably connected, so the mounting base 20
-23 move at the same time and at the same speed so that the welding surfaces do not come into contact with each other until they are pressed during welding.

As a result of the above-mentioned welding, the swell of flesh that occurs at each welded portion is pressed against the correction tool 56 provided at the lower end of the hot plate 40 through a gap of a certain size provided between each of the holding tools 30 to 33. It is formed into a perfect plane.

The product that has been welded and repaired as described above is cooled until the welded part has stable strength, and after cooling, the pressure from the pressers 30 to 33, etc. is loosened, and the protrusion 48 is pulled down, and the side opening is opened. Extrude and release the product.

Since the welding device for synthetic resin products of this invention is configured as explained above, even large products with relatively complex internal structures can be easily molded using small parts, and large molding machines and molds are not required. It is.

Further, since each component mounting table is configured to work in conjunction with each other, it is possible to uniformly and simultaneously melt and weld a large number of component welding surfaces at the same time, making it possible to obtain a product with high strength and high precision. It is particularly effective for large products, such as pallets for transporting cargo. Furthermore, since the hot plate only needs to be moved vertically up and down, the driving device for the hot plate becomes simple and a single driving device is sufficient.

[Brief explanation of the drawing]

Figures 1 and 2 are front views of a conventional welding method and device for synthetic resin products, Figure 3 is a perspective view showing a pallet dividing method made by the device of this invention, and Figure 4 is a front view of a conventional welding method and device for synthetic resin products. A schematic diagram showing how the product is divided,
Figures 5 to 10 show the device of this invention. Figure 5 is a partly cutaway plan view, and Figure 6 is a partially cutaway plan view.
FIG. 7 is a view taken along the line B-B in FIG. and the first
Figure 0 is an enlarged schematic diagram showing the structure and operating state of the cam and the mounting base when the cam is used as the drive device.
1 and 12 are principle explanatory diagrams for explaining the welding method using the device of this invention. 20-33... Parts mounting base, 24-27... Mounting frame, 28... Support frame, 29... Guide bar, 30-33... Holder, 34... Support plate,
35...Holder, 36...Guide bar, 37...
...Cylinder, 38...Positioning protrusion, 39...
Asia star (stopper), 40...hot plate, 4
1... Bed, 42... Pole, 43... Frame,
44...Device body (frame) 45...Mounting plate,
46... Hot plate frame, 47... Adjuster star (stopper), 48... Positioning protrusion, 49...
Cylinder, 50...button, 51...guide pin, 52...T-shaped groove, 53...guide member,
54... Connection plate, 55... Cylinder, 56...
Welding surface correction tool, 60...cam, 61...mounting frame,
62...Shaft, 63...Guide groove, 64...Pin, 6
5...Lever, 66...Screw pin, 67...Cylinder, 68...Arm.

Claims (1)

[Scope of utility model registration request] A plurality of welded parts mounting bases each having a flat upper surface at the same height on which a large number of welded parts are placed, move horizontally in the centripetal direction, and connect the apexes of the welded parts at one point. attached,
The movement of each mount is guided by a guide bar attached in the centripetal direction, and adjacent mounts are connected so that they are driven simultaneously by a slidable guide member. 1 or 2
The above-mentioned drive device is provided, and furthermore, a presser is mounted on each mounting base, which moves up and down by the drive device, and moves integrally with the mounting base and the parts in a centripetal direction when the welded parts are pressed and fixed by descending. , and an adjuster is provided on each opposing side of the presser to regulate the melting of the parts.Furthermore, the welding surface of each welded part is heated and melted by moving up and down between the mounts by a drive device. Equipped with a radial heating plate that
An apparatus for welding synthetic resin products, characterized in that the frame of the hot plate is provided with an adjuster that comes into contact with the adjuster of the presser to restrict melting of the parts, and a welding surface correction tool is provided at the lower end of the hot plate.