JPH0529539B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) 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.

(Prior art) 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. 63-61174, 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. It basically consists of a device and a heating plate that can be moved in and out between the holding devices when they are separated. 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, in such a welding device, when welding both skits by overlapping them as disclosed in Japanese Patent Publication No. 62-12017, for example, the welding margin of the skits (strictly speaking, the thickness regulation of the skits) is A melting and welding allowance setting device is also provided for accurately providing the melting allowance. This setting device is installed on a pressing plate or a mounting plate that constitutes a holding device, and is connected to one abutting table A whose upper surface is positioned at a position corresponding to the melting margin lower than the welding surface of the skit supported by the holding device. A position lower than the top surface of A (this height difference becomes the welding margin)
and one other abutting table B whose upper surface is positioned at. When this setting device is installed on the pressing plates of the upper and lower holding devices, one abutting table A, B is arranged so as to mesh with the other abutting table A, B facing them.

(Problem to be Solved by the Invention) However, in the case of the melting and welding allowance setting device in the conventional welding device, when the height or thickness of the skit is changed (to form a different type of pallet, When welding skits to each other), it is necessary to replace the skit with an abutting table A whose upper surface is positioned lower than the welding side surface of the skit by the amount of the desired melting margin. When the abutting table A is replaced, in the conventional setting device, the abutting table B must also be replaced regardless of whether or not the dimensions of the welding margin are changed. Moreover, such setting devices are installed at a total of 12 locations in one welding device, and replacing the butt table requires a person to enter the narrow space between the upper and lower holding devices of the welding device. The process can last several hours, making it extremely inefficient and something that needs to be improved.

An object of the present invention was to solve such conventional problems, and when forming different types of resin molded products by welding the upper and lower halves, it is possible to quickly change the thickness of the halves. It is an object of the present invention to provide a welding device capable of changing the height of a welding margin and an abutting table of a welding margin setting device.

(Means for Solving the Problems) The present invention provides a pair of holding devices that are arranged vertically facing each other to accommodate and hold objects to be welded together, and that can be approached and separated from each other. , and a heating plate provided so as to be able to go in and out between the holding devices when the holding devices are separated, wherein each of the holding devices includes a mounting plate and a welding plate provided on the side where the mounting plates face each other. a holding frame for regulating the outer wall of the object, each mounting plate of each holding device is provided with a setting device for defining the welding margin of the object to be welded, and the setting device is configured to adjust the thickness of the object to be welded. a support base movable in the horizontal direction; an abutment base of different heights mounted on the support base; and at least two abutment bases of different heights that are slidably disposed below the support base and adjust the height of the support base. It is characterized by having two reference stands.

(Function) According to the welding apparatus of the present invention, when welding objects with different thicknesses by holding them with upper and lower holding devices, the support base in the melting allowance and welding allowance setting device can be moved in the direction of the thickness of the welding objects. During this time, the reference stand placed at the bottom of the support stand is slid to selectively position the reference stand at a height corresponding to the object to be welded, and the support stand is placed on it. . Then, using a method similar to the conventional method, a heating plate is inserted between the objects to be welded, and the joint surfaces of the objects to be welded are melted until the butt table A comes into contact with the heating plate, and then the heating plate is removed and both objects to be welded are melted. are overlapped and joined using the difference in height between butt tables A and B as a welding margin.

(Embodiments) 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.

In FIG. 1, a welding device according to the present invention is shown with reference numeral 10.
It is shown in This welding device 10 includes a pair of holding devices 11 that are vertically spaced apart and facing each other, a heating plate 12 that is provided so as to be able to go in and out within this space (see FIG. 2), and each holding device. It is composed of protruding members 13a and 13b disposed inside 11.

Each of the holding devices 11 includes a mounting plate 14 and a holding frame 15 provided on the mounting plate. The holding frame 15 is composed of a plurality of frame pieces 15a that are divided into a plurality of frame pieces 15a to support half-molded products (skits) of an unwelded pallet 16, which is made by overlapping half-molded products divided into two on one upper and lower side, on the outer surface. , these frame pieces 15a
is supported on a rail 15b so that its position can be changed depending on the size of the skit to be molded.

The mounting plate 14 of each holding device 11 is attached to a support frame 18 via a cylinder device 17, respectively. Thereby, each holding device 11 can be moved toward and away from each other by the operation of each cylinder device. At this time, a guide rod 19 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.

By the way, in the above-mentioned protruding members 13a and 13b, the protruding member 13a is fixedly attached to the lower beam 18a of the support frame 18, and the protruding member 13b is the piston rod of the cylinder device 20 fixed to the upper beam 18b. , therefore, the protruding member 13b itself is movable. Each of these protruding members 13a, 13b is connected to the frame piece 15a through a hole formed in each mounting plate 14 of the holding device 11.
It is arranged so that it enters the area divided by.

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 the supply source that appropriately supplies the unwelded pallets 16.
When feeding a set of pallets 16 between the spacer holding devices 11 separated by 0, 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 projecting members 13a are chamfered on the entry side of the unwelded pallets 16, each projecting member 13a and the bottom edge of the side wall in the entry direction of the pallet 16 can slide quickly without colliding face-to-face.

The unwelded pallet 16 placed on the protrusion member 13a in this manner is placed in a position aligned with the holding frame 15 by the positioning device 21. Next, this positioning device 21 is removed from between the holding devices 11, and the lower holding device 11 is replaced with the cylinder device 1.
At the same time, the upper holding device 11 is also lowered by the cylinder device 17, so that the respective holding devices approach each other. At this time, as the holding device 11 rises, the protruding member 13a relatively comes out of the holding frame 15, and therefore, the unwelded pallet 16 is moved into the holding frame 15 by the approach thrust of each holding device 11. Press-fitted. That is, the lower half of the unwelded pallet 16 is placed in the holding frame 15 of the lower holding device 11, and the upper half is placed in the upper holding device 1.
They are press-fitted into the holding frame 15 of No. 1, respectively.

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 17. The reason for this is that when the lower holding device 11 descends, the protruding member 13a moves relative to the holding frame 1.
5 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 is lowered to bring both halves of the unwelded pallet 16 into contact with each other, and the two halves of the unwelded pallet 16 are moved relative to each other by the thrust force of the cylinder device 17 and the supporting force of the other cylinder device 17 via the bottom plate which is the mounting plate 14 of each holding device 11. A pressing force, that is, a pressure 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 20, and only the upper holding device 11 is raised. As a result, the protruding member 13b relatively enters into the holding frame 15 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 holding frame 15 by the entry of the relative projecting member 13a into the holding frame 15. 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 or higher than the upper surface of the holding frame 15 in the lower holding device 11, so that the pallet 16' is not transported next time. The unwelded pallets 16 are pushed out and moved to the side discharge side of the welding device 10 without any hindrance.

The above is the overall operation of this welding device 10, and the details of other constituent parts will be explained below based on such operation.

The mounting plate 14 of each holding device 11 is provided with a melting allowance and welding allowance setting device (hereinafter simply referred to as a setting device) 22 located outside the holding frame 15 as shown in FIG. There is. This setting device 22 is used to melt the skits of the unwelded pallets 16 when overlapping and welding them.
In other words, the design thickness of the skit before welding and the welding margin, that is, the welding thickness, are precisely given. There are eight locations.

As clearly shown in FIG. 3, this setting device 22 fixes two abutment tables 23a and 23b, which are arranged adjacent to each other and have different heights, onto a support table 24 from the top surface of each with bolts or the like. It is composed of This support stand 24 is fixed to the piston rods 26a of two air cylinder devices 26, each of which has a piston rod 26a extending upward from a common hole in the upper surface of the gate-shaped pedestal 25 fixed to the mounting plate 14. It is said that it can be moved up and down. On the upper surface of this pedestal 25 and below the support base 24, a sliding base 27 having flange portions 27a formed at both ends is arranged. The flange portion 27a of this sliding table 27 is fitted into a dovetail groove formed by an inverted L-shaped holding member 28 attached to the pedestal 25, so that the sliding pedestal 27 can move linearly on the pedestal 25. It is said to be able to move back and forth. This sliding table 27
A dovetail groove is also formed at the upper center of the slide table 27, and two reference stands 29 of different heights are fitted into this dovetail groove, and the stoppers 30 provided at both ends of the sliding stand 27 prevent them from falling off.

An air cylinder device 32 is fixed to one end of the pedestal 25 via a mounting member or bracket 31, and an end of a piston rod 32a of the air cylinder device 32 is connected to an end surface of the sliding table 27. As a result, the sliding table 27 slides on the pedestal 25 by the operation of the air cylinder device 32,
Reference stands 2 of different heights held on the sliding stand 27
9 can be selectively positioned below the support platform 24.

According to the setting device 22 constructed in this way, when forming several types of pallets 16', it is possible to set the thickness and welding margin of each skit when welding the skits corresponding to each pallet to each other.
That is, when the slit is brought into contact with the heating plate 12 to melt the joint side thereof, the slit is melted until the high abutting table 23a comes into contact with the heating plate 12. This setting device 22 is also attached to the mounting plate 14 of the upper holding device 11 at the same position.
However, the setting device 22 attached to the upper holding device 11 has butt tables 23a and 23 of different heights.
The positions of b are different, and the upper and lower butting tables 23a, 23
It is designed to mesh with b.

From this, it follows that the welding margin of the skit is obtained by the height of the abutment stands 23a, 23b. Generally, this welding margin does not change much even for pallets of different sizes, and therefore, in most cases, the difference in height between the abutting tables 23a and 23b may be constant. However, different types of pallets often have different thicknesses. That is, the thickness of the skit changes. Therefore, in such a case, the support stand 24 is raised by the air cylinder device 26, and during that time the air cylinder device 32 is operated to slide the sliding table 27, so that the reference stand 29 at the desired height is raised to the support stand. The height of the support stand 24 is changed by positioning it directly below the support stand 24. As a result, the upper surface level of the high abutment table 23a is changed together with the other abutment table 23b, and the setting of the melting margin of skits of different thicknesses can be done entirely mechanically without using human hands.

In the welding apparatus of the above-described embodiment, the setting device 22 is equipped with two reference stands 29 of different heights, but the number of reference stands 29 is not limited to two, and may be pre-scheduled. Depending on the number of types of palettes, there can be three or more.

(Effects of the Invention) As explained above, according to the welding apparatus of the present invention, the height of the butt table for setting the melting margin of the welded material and the welding margin in the welding margin setting device can be adjusted to
Since the butt table can be changed mechanically and in an extremely short time without replacing the butt table, it is possible to very quickly set the melting margin when forming several types of pallets, and it is possible to perform several types of welding with one welding device. The productivity of pallet forming can be dramatically improved.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a welding apparatus according to an embodiment of the present invention, and FIG. 2 is a front view partially showing a melting allowance and welding allowance setting device provided in the welding apparatus shown in FIG. 1. 3 is a perspective view showing the melting allowance and welding allowance setting device shown in FIG. 2. 10... Welding device, 11... Holding device, 12...
...Heating plate, 14...Mounting plate, 15...Holding frame, 1
6... Unwelded pallet, 22... Melting allowance and welding allowance setting device, 23a, 23b... Butting table, 24... Supporting table, 26... Air cylinder device, 27... Sliding table, 29... Standard Stand, 32...
...Air cylinder device.

Claims (1)

[Scope of Claims] 1. A pair of holding devices that are arranged vertically opposite each other to accommodate and hold objects to be welded together, and that can be approached 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 two when separated, each of the holding devices controls the mounting plate and the outer wall of the object to be welded, which is provided on the side where the mounting plates face each other. a holding frame, each of the mounting plates of each of the holding devices is provided with a setting device for defining the welding margin of the welded object, and the setting device is a support movable in the thickness direction of the welded object. It comprises a stand, an abutment stand of different heights mounted on the support stand, and at least two reference stands of different heights that are slidably disposed below the support stand and adjust the height of the support stand. A welding device characterized by: