JPH0554817B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a welding device, and more specifically,
The present invention relates to a welding device used to weld and join synthetic resin molded products into a finished molded product.

[Conventional technology]

Conventionally, this type of welding device has been disclosed in Japanese Patent Publication No. 60-32575, Japanese Patent Publication No. 62-12017, and Japanese Patent Publication No. 63-56852.
It is disclosed in Japanese Patent Publication No. 61-50770, etc.

The conventional welding devices disclosed in these publications include a pair of holders that are arranged vertically facing each other and that can be approached and separated from each other in order to accommodate and hold the objects to be welded together. The device includes a heating plate that can be moved in and out between the holding devices when the holding devices are separated, and the object to be welded, which is held by the pair of holding devices vertically facing each other, is pressed by the approach of the holding devices. The welding device is configured to include a press plate for welding and a holding frame for holding the object to be welded on the press plate. The operation of such a welding device is, for example, when the upper and lower halves of a resin pallet (hereinafter simply referred to as skits) are the objects to be welded, the upper and lower skits are held by opposing holding devices. The welding side of each skit is pressed against the surface of the heating plate at the same time to melt it, and the heating plate is then removed and both skits are butted and joined by their fused parts. .

By the way, it is known that the respective skits that are welded and joined to each other by a welding device shrink in a predetermined curve over time after being molded. Therefore, such a skit is usually molded using a suitable mold in order to obtain a size slightly larger than the designed finished product size. and,
After a predetermined period of time has elapsed after molding, each skit is placed in a formwork in order to accurately align the two molded products and to achieve the designed finished product dimensions assuming the existence of shrinkage errors in each molded product. They are aligned and welded together while correcting the dimensions. Accurate alignment of the upper and lower skids is important because in the case of resin pallets, the warping of each pallet, which occurs noticeably due to the increase in size and the narrowing of the welding surface, or the positional deviation of the joint surfaces due to differences in shrinkage, etc. It is considered to be particularly important because it is a major factor in reducing strength.

Formwork used for such applications is a holding device that has an internal shape that is substantially the same as the external shape of the object to be welded (skit) but slightly smaller (designed dimensions of the finished product) in the welding equipment. A frame was provided on opposite surfaces of each pressing plate. and,
This holding frame was attached so as to be movable relative to the press plate so that molded products such as pallets of several sizes could be held and corrected.

[Problem to be solved by the invention]

However, with the holding frame of the holding device in conventional welding equipment, if the size of the welded object changes, it is not possible to position the welded object with the center of the press plate at the center of the welded object. The larger the value, the more difficult it becomes for the holding frame to control the corners of the welded object. In particular, from past experience, the regulation by the holding frame at each corner of the welded object is extremely effective for holding and correcting the welded object, and from this point of view, the size of the holding device in conventional welding equipment is different. There was insufficient effective position control for the welded object when the welded object was stuck.

SUMMARY OF THE INVENTION An object of the present invention was to solve the problems of the conventional art, and to provide a welding device equipped with a holding device that can regulate the position of each corner of a welded object even when the size of the welded object varies. There is a particular thing.

[Means to solve the problem]

The welding device of the present invention includes a pair of holding devices that are arranged vertically opposite each other to accommodate and hold objects to be welded together and that are relatively movable and separated from each other, and the holding devices are In a welding device consisting of a heating plate that can be moved in and out between the heating plates when separated, each of the holding devices is provided on the surface of a pressing plate and opposing sides of the pressing plate, and the holding device is provided at least on each corner of the object to be welded. Corner plates arranged at corresponding positions and frame members attached to each of the plates, each of the corner plates extending along each side connected to each corner of the welded object in different directions. It is characterized in that it is movably supported by an upper rail of two rails, and further, the upper rail is movably supported by a lower rail attached to the surface of the press plate.

[Effect]

According to the welding device of the present invention, when different types (different sizes) of objects to be welded are held by the holding device, each corner plate is moved using two stages of rails in different directions. The attached frame member is accurately positioned at each corner of the object to be welded and each corner is held. Then, using a method similar to the conventional method, a heating plate is inserted between the objects to be welded to melt the joint surfaces of the objects to be welded, and then the heating plate is removed and the two objects to be welded are overlapped and bonded.

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, the welding apparatus of the present invention will be described in more detail with reference to embodiments shown in the accompanying drawings. Note that this example shows a welding device used to form a pallet as an example of a synthetic resin molded product, and therefore,
In the following description, the synthetic resin molded product will be simply referred to as a pallet.

FIG. 1 shows a welding apparatus 10 according to the present invention. This welding device 10 includes a pair of holding devices 11 that are vertically spaced apart from each other and are arranged opposite to each other.
, a heating plate 12 (FIG. 2) provided so as to be able to move in and out within this space, and protruding members 13a and 13b located inside each holding device 11.

Each of the holding devices 11 includes a pressing plate 14 and a holding frame 15 provided on the pressing plate 14. This holding frame 15 is made up of a plurality of plates 17 that receive skits of an unwelded pallet 16 in which semi-molded products (skits) are stacked on top of each other and are divided into two halves on one upper and lower side.
a, 17b included. These plates 17a, 1
7b are arranged in a rectangular area according to the shape of the skit and along each side of the skit,
In this case, a corner plate 17a is always arranged at each corner of the area. An intermediate plate 17b is arranged between each corner plate 17a. Two frame members 18 are attached to each corner plate 17a in an L-shape for holding and regulating the corners of the skit. Two frame members 18 attached to each corner plate 17a
A plurality of long holes 19 are formed in the plate 17a, each extending in a direction perpendicular to the longitudinal direction of the frame member 18, so that the mutual proximity can be adjusted. is fixed. On the other hand, a frame member 18 for holding and regulating the sides of the skit is fixed to the intermediate plate 17b.

By the way, among these plates, the corner plate 17a has two upper and lower plates arranged in directions perpendicular to each other, as is clear from FIGS. 1 and 2.
It is supported by the press plate 14 by step rails 21a and 21b. That is, on the surface of the press plate 14, a large number of rails 21a extending in the direction of movement of the pallets are arranged in parallel on the introduction side of the unwelded pallets 16 and on the discharge side of the welded pallets 16', respectively. These rails 21a are the lower rails, and two rails 21b extending in orthogonal directions and integrally assembled are arranged movably on the lower rails 21a, which are the upper rails. It is a rail.

Among the two rails 21a and 21b installed on both sides of the press plate 14, the upper rail 21b
Corner plates 17a are provided at both ends of the rail 2.
1b, and an intermediate plate 17b is fixed at a substantially intermediate position between the corner plates 17a at both ends. That is,
This intermediate plate 17b does not move relative to the upper rail 21b.

Further, between the two rails 21a and 21b arranged on both sides of the press plate 14, that is, at the middle position of the press plate 14, there is a rail extending from the front through the center of the press plate 14 to the rear over almost the entire width. rail 22
are arranged, and intermediate plates 17b similar to those described above are attached to both ends thereof so as to be movable on the rails 22. A skid center receiving plate 23 is fixed to the rail 22 at an intermediate position of the rail 22, that is, at a center position of the pressing plate 14. This skit center support plate 23 literally supports the center of the skit, and since the surface of the skit rests on its entire surface, it goes without saying that there is no frame member or the like on the support plate 23.

As a result, assuming that the moving direction of the unwelded pallet 16 is X, each corner plate 17a moves in the X direction by moving the upper rail 21b as a whole on the lower rail 21a by the cylinder device. By moving on the rail 21b using another cylinder device, it moves in the Y direction perpendicular to the X direction. In addition, the upper rail 21b
The intermediate plate 17b fixed to is moved in the X direction by the movement of the upper rail 21b with respect to the lower rail 21a, and the intermediate plate 17b fixed to
is moved in the Y direction on the rail 22 by a cylinder device.

The press plates 14 in each of the holding devices 11 configured as described above are each attached to a support frame 25 via a cylinder device 24. Thereby, each holding device 11 can be moved away from and approached by each cylinder device 24 by operation of each cylinder device 24. At this time, a guide rod 26 is attached to the mounting plate in order to move each holding device 11 accurately and stably in a predetermined direction, that is, in the present embodiment, vertically.

Among the projecting members 13a and 13b described above, one projecting member 13a is fixedly attached to the lower beam 25a of the support frame 25, and the other projecting member 13b is the piston rod of the cylinder device 27 fixed to the upper beam 25b. , therefore, the protruding member 13b itself is movable. Each of these protruding members 13a, 13b is arranged so as to enter the minimum area defined by the frame member 18 through a hole formed in each pressing plate 14 of the holding device 11.

In particular, when each holding device 11 is in the state of receiving the unwelded pallet 16 with maximum separation (the state shown in FIG. It has a length that projects higher than the top surface. The upper end of each protruding member 13a on the side where the unwelded pallet 16 enters the welding device 10 is chamfered.

According to such a protruding member 13a, the welding device 1 can be connected to the welding device 1 from a supply source that appropriately supplies the unwelded pallets 16.
When feeding a set of pallets 16 between the holding devices 11 spaced apart from each other, the projecting member 13a protrudes higher than the upper surface of the frame piece 15a of the holding device 11a, so that the frame piece does not become an obstacle. It can be placed on the plurality of protruding members 13a while being slid from the side of the welding device 10. Moreover,
Since the upper edges of the protruding members 13a are chamfered on the entry side of the unwelded pallets 16, each protruding member 13a and the bottom edge of the side wall in the advancing direction of the pallet 16 can slide quickly without colliding face-to-face.

The unwelded pallet 16 placed on the protruding member 13a in this manner is positioned by the positioning device 28 at a position aligned with the area defined by the frame member 18. Next, this positioning device 28 is removed from between the holding devices 11, the lower holding device 11 is raised by the cylinder device 24, and at the same time the upper holding device 11 is also lowered by the cylinder device 24, and each holding device 11 is lowered by the cylinder device 24. The device approaches. At this time, as the holding device 11 rises, the protruding member 13a relatively comes out of the frame member 18, and therefore, the unwelded pallet 16 is pushed into the frame member 18 by the approach thrust of each holding device 11. Press-fitted. That is, the lower half of the unwelded pallet 16 is press-fitted into the frame member 18 of the lower holding device 11, and the upper half is press-fitted into the frame member 18 of the upper holding device 11.

Next, in the holding device 11 which press-fits and holds each half of the unwelded pallet 16, only the upper holding device 11 is raised and returned to its original position, that is, the position shown in FIG. 1, by the operation of the cylinder device 24. The reason for this is that when the lower holding device 11 descends, the protruding member 13a moves relative to the frame member 1.
8 and pushes out half of the unwelded pallet 16.

When the two halves of the unwelded pallet 16 are separated in this way, a heating plate 12 (see FIG. 2) is placed between them.
is moved and placed. Then, the lower holding device 11 is further raised and the upper holding device 11 is lowered so that the joint surface of the half portion of the unwelded pallet 16 comes into contact with the heating plate 12. This results in
Pallets 1 in contact with both sides of the heating plate 12
The joint surfaces of each half of 6 are melted and then separated again by the hot plate 12, at which time the hot plate 12 returns to its original standby position. And the upper holding device 1
1 descends to bring both halves of the unwelded pallet 16 into contact with each other, and a relative push is applied via the pressing plate 14 of each holding device 11 by the thrust of the cylinder device 24 and the supporting force of the other cylinder device 24. Pressure or crimping force is applied to both halves.

As a result, both halves of the unwelded pallet 16 are welded and joined. Thereafter, the protruding member 13b, which has been moved together with the upper holding device 11, is immobilized by its cylinder device 27, and only the upper holding device 11 is raised. As a result, the protruding member 13b relatively enters into the frame member 18 and pushes out the welded pallet 16'. The lower holding device 11 is then also lowered, so that the pallet 16' is pushed out of the frame member 18 by the entry of the relative projecting member 13a into the frame member 18. Of course, in reality, the pallet 16' is positioned and stationary on the protruding member 13a, and the holding frame 1
Only part 5 descends and returns to its initial position.

For this reason, the pallet 16' is supported by the protruding member 13a that protrudes at the same level as the upper surface of the frame member 18 in the lower holding device 11 or higher than the upper surface, so that the pallet 16' is not transported next. The unwelded pallets 16 are pushed out and moved to the lateral discharge side of the welding device 10 without any hindrance.

As mentioned above, the upper and lower skits of the unwelded pallet 16 are held by the holding device 11, but the unwelded pallet 1 of another type with a different size is
When joining each of the 6 skits, each corner plate 17a is moved in either or both of the X direction and the Y direction to position it in the dimension of the completed pallet 16', that is, in the corrected dimension position, and the intermediate plate 17b is also moved to a predetermined position accordingly. However, the intermediate plate 17b fixed to the upper rail 21b of the two-tiered rails on both sides of the press plate 14 moves together with the movement of the corner plate 17a in the X direction (because the entire upper rail 21b moves in the X direction). Therefore, operations such as moving this independently are not performed. As a result, even if different sizes of pallets of different types result in different length/width ratios, the skit can be placed in the center of the press plate 14 and its corners can be tightened. And it can be held orthodontically.

As shown in FIGS. 1 and 2, melting and welding allowance setting devices 29 are provided on both sides of the press plate 14. This setting device 29 is used to accurately set the melting margin of the skits when overlapping and welding the skits of the unwelded pallets 16, in other words, to accurately provide the design thickness of the skits before welding and the welding margin, that is, the welding thickness. It is something.
However, since this is not a feature of the present invention, further explanation will be omitted.

〔Effect of the invention〕

As explained above, according to the welding apparatus of the present invention, even when the size of the welded object changes variously, each corner can be held and straightened while the welded object is placed in the center of the press plate. As a result, it is possible to form a resin molded product with stable strength at the welded part.

[Brief explanation of drawings]

FIG. 1 is a front view showing a welding device according to an embodiment of the present invention, and FIG. 2 shows a partial view of the corner plate and the two-stage rail supporting the corner plate in the holding device of the welding device shown in FIG. Front view shown in Figure 3
The figure is a plan view showing only the holding frame on the press plate, taken along the - line in FIG. 1. 10... Welding device, 11... Holding device, 12...
...Heating plate, 14...Press plate, 15...Holding frame, 1
6... Unwelded pallet, 17a... Corner plate, 17b... Intermediate plate, 18... Frame member,
21a...Lower rail, 21b...Upper rail, 22...Rail.

Claims (1)

[Claims] 1 A pair of holding devices that are arranged vertically facing each other to accommodate and hold the objects to be welded together, and that can be approached and separated from each other, and that when the holding devices are separated, the space between them is In a welding device consisting of a heating plate that is provided so as to be removable, each of the holding devices is provided on a surface of a pressing plate and opposing sides of the pressing plate, and is arranged at a position corresponding to at least each corner of the object to be welded. a corner plate and a frame member attached to each of the plates, each of the corner plates extending along each side that connects at each corner of the welded object;
A welding device characterized in that it is movably supported by an upper rail of two rails in different directions, and the upper rail is further movably supported by a lower rail attached to the surface of the press plate.