JPH0691759A - End surface welding device for flexible irregular shape - Google Patents

Abstract

PURPOSE:To make the welded surface cleaner by making it possible even for an inexperienced worker to weld a shape easily, and preventing a distortion or slipping from generating on the welded flexible shape. CONSTITUTION:On a pair of slide plates 7, 8 which open or close to the right and left, right and left jigs 12, 16 and gripping mechanisms 13, 17 are respectively provided. The whole of them is provided on a slide table 4 which longitudianally reciprocates, and a heating plate 21 is made to enter/retract between the jigs 12, 16. In addition, a positioning plate 19 is made to ascend from an opening 20 of the positioning plate 19 to be inserted between the jigs 12, 16, and is made to descend to retreat from the slide table 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an end face welding apparatus for a soft profile material. More specifically, the present invention relates to a device that semi-automatically and accurately welds cut end surfaces of an extruded product of a soft thermoplastic resin used for packing a door of a refrigerator.

[0002]

2. Description of the Related Art In general, a packing for a door of a refrigerator is basically constructed by combining tubes each having a quadrangular cross section in a frame shape in order to improve heat insulation. Such a packing is obtained by cutting an extruded product having a soft irregular cross section into a predetermined size, and then cutting the end portion obliquely or directly in a predetermined size, and heating and pressing the cut end surfaces. The corner portions are formed by welding, and the whole is formed into a rectangular frame shape.
In this case, if the cut end faces are welded to each other and are slightly displaced or twisted, the square frame as a whole is twisted or corrugated. In addition, since the extruded product of the tube has a relatively small wall thickness, if it is misaligned, it may become a defective product in which the inside and outside of the tube communicate with each other. Therefore, conventionally, an operator inserts two tubes into a jig and slides the jig toward the heating plate interposed between the end surfaces to bring the tube end surface into contact with or close to the heating plate, and then to heat. The plate is removed from between both tubes, and immediately after that, the jig is slid again and both end faces are accurately pressed against each other for welding.

[0003]

In the conventional method using a simple slide jig, since the tube is soft, the position of the tube to be inserted into the jig, particularly the dimension projected from the jig can be accurately adjusted. Have difficulty. In addition, the method of bringing the end surface of the tube into contact with the heating plate to rub the tube takes time, and the method of bringing the tube into contact with the heating plate causes variations in pressing force, resulting in a difference in melting degree. Furthermore, the contact force between the end faces is likely to vary,
A high degree of skill is required to perform accurate heat fusion. Further, when the tube is brought into contact with the heating plate, the dust adheres to the heating plate, so that it is necessary to wipe off the dust from time to time, which lowers the work efficiency.

In view of the problems of the conventional method of relying on manual work, the present invention accurately and efficiently welds the end faces of the mold material of the soft resin, particularly the end faces of the corners, even to an unskilled person. It is a technical problem to provide a device that can be used.

[0005]

The first aspect of the end face welding apparatus for a soft profiled material of the present invention is to (a) hold the end portions of a pair of die members to be welded in a state where the end surfaces face each other. A pair of holding means, and (b) the pair of holding means so as to have a position where the end faces contact each other and a position where the end faces contact each other.
Relative to the holding means, so as to take a means for reciprocating in the opposite direction, (c) a position interposed between the end faces of the mold material held by the holding means, and a position deviated from the position. Alignment plate that is reciprocally driven,
(D) A heating plate which is reciprocally driven relative to the holding means so as to take a position interposed between the end surfaces of the mold material held by the holding means and a position deviated from the position. Has been done.

When the mold members having the inclined end faces are welded to each other in a corner shape, the holding means is configured so that the mold members can be held in an inclined state with respect to the alignment plate. It should be noted that both the holding means for welding in a straight line and the holding means for forming a corner may be provided, or the angle of the holding means may be adjusted so as to accommodate both. The holding means and the reciprocating drive means are provided on a slide table that reciprocates in a direction perpendicular to the moving direction of the holding means, and the heating plate is fixed upright along the moving direction of the slide plate, A positioning plate may be provided so as to rise and descend through an opening formed in the slide plate and to be interposed between the end faces at a raised position.

A second aspect of the apparatus of the present invention is (a) a pair of holding means for holding the end portions of a pair of mold materials to be welded with their end faces facing each other, and (b) the pair of holding means. A means for reciprocally driving the holding means in opposite directions so as to take a position where the end surfaces are in contact with each other and a position where the end surfaces are apart from each other;
(C) A heating plate which is reciprocally driven relative to the holding means so as to take a position interposed between the end surfaces of the mold material held by the holding means and a position deviated from the position. d) When the holding means is reciprocally driven relative to the heating plate, the holding means moves relative to the heating plate together with the holding means, and when the holding means are brought closer to each other, the holding means moves away from both sides of the heating plate, It is composed of a pair of cleaner members that open and close in conjunction with the means for reciprocally driving the holding means so as to contact both sides of the heating plate when separated.

[0008]

In the apparatus according to the first aspect of the present invention, when the holding means holds the mold material, the positioning plate is first interposed between the holding means, and then the end surface of the mold material is pressed against the positioning plate and held. Thereby, the positioning can be performed in substantially the same state as the case where the heating plate is subsequently pressed and the case where the heated end faces are abutted with each other. Therefore, the degree of heating and melting of the end faces can be made substantially the same on both end faces, and accurate and clean welding can be performed. In particular, when two mold materials are welded in a corner shape, some bending force is applied to the mold material, but since the pressing force between the end faces is almost equal, an accurate corner shape can be obtained.

In the apparatus according to the fourth aspect, the cleaner member contacts both surfaces of the heating plate when the holding means are open. Therefore, when the holding means and the heating plate move relative to each other in that state, the cleaner member can wipe the surface of the heating plate and remove the dust adhering to the surface.

[0010]

Embodiments of the welding apparatus of the present invention will be described below with reference to the drawings. 1 and 2 are a plan view and a front view, respectively, showing an embodiment of the apparatus of the present invention, FIG. 3 is a perspective view of a main part of the apparatus of FIG. 1, and FIG. 4 shows an operation sequence of the apparatus of FIG. 5 is a front view showing an embodiment of the heater cleaner according to the present invention.

In FIG. 1 and FIG. 2, the welding device is installed on the frame 1 and is controlled by a control panel 2 mounted beside the frame 1. Two guides 3 are mounted on the frame 1 so as to extend parallel to each other in the front-rear direction, and a slide table 4 is provided on the guides 3 so as to be movable back and forth. The slide table 4 is reciprocally driven by an air cylinder 5.

As shown in FIG. 2, guide blocks 6 are mounted on the table 4 symmetrically with a center plane C interposed, and slide plates 7 and 8 are mounted on the guide blocks 6, respectively. It is mounted so that it can be moved left and right. Further, each slide plate 7, 8 is reciprocally driven by an air cylinder 9. On the slide plate 7 on the left side, the mold insertion groove 1 is formed in the diagonally upper right direction.
A left-side jig 12 provided with 1 and a grip mechanism 13 for pressing the mold material L inserted in the jig 12 are provided. The grip mechanism 13 has an arm 15 that is driven by an air cylinder 14 that performs a combined operation. The arm 15 is rotated counterclockwise while the air cylinder 14 contracts halfway, and then the arm 15 moves in the direction in which the air cylinder 14 contracts. 15 is to move straight ahead. Air cylinder 1
Even when 4 is extended, the arm 15 is first moved straight, and further rotated clockwise. Such a grip mechanism 1
As 3, a rotary clamp (air type) made by Nippon Okaherd or the like can be used.

The jig 16 and the grip mechanism 17 on the right side
Are plane-symmetrical to the left jig 12 and the grip mechanism 13, and have substantially the same configuration except that the right mold material R is gripped, and perform the same operation. In the present invention, the mold material L having an irregular cross section is placed in the mold insertion groove 11 of the jig 12, 16.
A mold suitable for R is attached so as to be replaceable, and the mold members L and R are gripped by this mold, but they are omitted in FIG.

As shown in FIG. 2, an air cylinder 18 that expands and contracts in the vertical direction is attached below the slide table 4 at the center of the frame 1, and a positioning plate 19 is attached to the tip of the rod. There is. The positioning plate 19 is set so as to move up and down along the center plane C. When the positioning plate 19 is moved up, it penetrates through the opening 20 formed in the slide table 4 and is interposed between the left and right jigs 12 and 16 to descend. At the time, it has a stroke that allows it to escape below the slide table 4.

Further, in FIG. 1, a heating plate 21 is provided upright along the center plane C on the rear side of the frame 1. This heating plate 21 is, as shown in FIG.
It is attached to the frame 1 by the leg portion 22 at the rear end, and a gap G is provided between the frame 1 and the front side so as not to interfere with the slide table 4. A large number of holes 23 for heat radiation and cooling are formed on the rear side of the heating plate 21. As the heating plate 21, it is possible to use a conventionally known plate that is heated to a set temperature by electric heating. In this embodiment, the heating plate 21 is fixed and the jigs 12 and 16 are slid back and forth. However, depending on the sizes of the mold members L and R to be welded, the jig 1 may be reversed.
The heating plates 21 may be moved back and forth while fixing 2, 16 and the like.

Next, the operation of the welding device constructed as described above will be described with reference to FIGS. 3 and 4. (0) Standby state The original initial state is indefinite, and the following standby state is obtained by stepping on a foot switch (not shown). That is, as shown in FIG. 3, the slide table 4 is on the front side, and the jigs 12 and 16 are removed from the heating plate 21. Further, the left and right slide plates 7, 8 are moved so as to approach each other, that is, the jigs 12, 16 approach each other, and the grip mechanisms 13, 17 are moved.
Is rising and open. Further, the positioning plate 19 is raised.

(I) Mold material supplying step In this state, as shown by I in FIG.
The mold members L and R are inserted into Nos. 2 and 16. At this time, mold materials L and R
The front end surfaces (the surfaces to be welded) of the contact plates are brought into contact with both surfaces of the positioning plate 19. Then, in this state, step on the foot switch again. (Ia) Grip process As a result, first, the arms 15 of the grip mechanisms 13 and 17 pivot and descend clockwise or counterclockwise to grip the mold members L and R on the jigs 12 and 16.

(II) Heating Step Next, the left and right slide plates 7 and 8 are moved so as to be separated from each other, and the jigs 12 and 16 are separated from each other. In this state, the positioning plate 19 first escapes downward, and the slide table 4 further moves forward so that the heating plate 21 is sandwiched between the jigs 12 and 16 (IIa in FIG. 4). Further, the left and right jigs 12 and 16 move closer to each other, press the end faces of the mold members L and R against both surfaces of the heating plate 21, and heat and melt the end faces for a predetermined time (for example, 3 to 10 seconds) ( IIb) in FIG.

(III) Welding Step Next, the jigs 12 and 16 are opened to the left and right, the slide table 4 is again moved to the front side, and the heating plate 21 is retracted from between the mold members L and R. Further, the jigs 12 and 16 move so as to approach each other three times, and the end faces of the heated and melted mold materials L and R are brought into contact accurately with each other.

(VI) Extracting Step After a predetermined time (for example, 3 to 10 seconds) has elapsed, the grip mechanisms 13 and 17 are released. Then, the operator lifts the L-shaped welded mold material from the jig and removes it. (O) Standby state Next, when the foot switch is stepped on, the positioning plate 19 rises from this state, and the state returns to the standby state.

The above series of operations can be performed by sequence control in which the completion of each step is detected by a position detection sensor provided in each air cylinder or slide table 4, and the next step is started accordingly. it can. Further, it is preferable that the heating and melting time and the welding time can be adjusted by a timer or the like. In the above embodiment, the case where the mold material is welded in the L-shape has been described, but it is possible to weld it in a straight line by exchanging it with the jig P of FIG. 1, for example.
Further, the angles of the jigs 12 and 16 may be changed. It is also possible to dispose the left-sided mold material L diagonally so as to be on the upper left side and the right-sided mold material R diagonally so as to be on the upper right side, and to dispose in the vertical plane as a whole. Further, two or more pairs of profile extruded profile materials may be welded at once or more. In addition, in the final process, the operator manually removes the mold material from the jig.
You may make it take out a mold material by raising.

As the mold material that can be welded by the apparatus of the present invention,
Examples of the extruded product include soft polyvinyl chloride, soft polyethylene, polypropylene, polyurethane, and silicone resin. In addition to these, any one that can be pressure-bonded after being heated and melted by a heating plate can be used.

Next, an embodiment of the heater cleaner will be described with reference to FIG. The heating plate of the type in which the soft mold material is brought into direct contact as in the present invention is usually formed by attaching a difficult-to-adhere tape or sheet made of a fluororesin (such as polytetrafluoroethylene) to the surface of the soft mold material. The edges are not attached. However, even if the end portions of the mold material are pressed against and heated many times, the molten resin adheres as dust. The heater cleaner shown in FIG. 5 is such that such dust is intermittently wiped off by utilizing the reciprocal movements of the left and right slide plates 7 and 8 and the front and rear movements of the slide table 4. .

This heater cleaner is composed of a fulcrum 28 formed on the slide table 4 by a screw and the like, and a pair of U-shaped links 29 rotatably provided around the fulcrum 28. The link 29 has a diameter of 3 to 4 mm, for example.
, And the proximal end 30 side engages with the slide plates 7, 8 or a member that moves together with the slide plates 7, 8. For example, in this embodiment, the forked member 3 attached to the tip of the cylinder rod of the air cylinder 9 for driving the slide plate.
1 is formed with the link slide groove 32, and the base end 30 is formed in these.
Is fitted so that it can slide up and down. And tip 33
A cleaner member 34 is attached to the periphery of the side.

In this case, when the air cylinder 9 is retracted (FIG. 5a), the cleaner member 34 causes the heating plate 2 to move.
1 is sandwiched and the air cylinder 9 moves forward (see FIG.
Open to b). Therefore, when the slide table 4 moves forward in the first half (IIa) of the heating step of FIG. 4, both surfaces of the heating plate 21 are sandwiched by the cleaner members 34 and wiped off. Further, even when the slide table 4 returns to the front side during the welding step (III), the cleaner member 34 can be wiped off.

As the cleaner member 34, a heating plate having a high temperature of 300 to 400 ° C. is used, and therefore a heat resistant and flexible material such as asbestos is preferable. Further, since the cleaner member 34 is separated from the heating plate 21 while the jig is closed by the link mechanism, the cleaner member 34 can be made to last longer by removing excess heating. Further, at times, it is possible to drop debris from the cleaner member 34 while it is away from the heating plate 21. The link 29 that supports the cleaner member 34 can be opened and closed by a separate drive source, but if the opening / closing operation of the slide plate is used as in this embodiment, there is an advantage that a separate power source is unnecessary.

[0027]

Since the positioning plate can be inserted between the jigs in the apparatus of the present invention, before the end faces of the soft profile extrusion product are pressed against the heating plate, the positioning plate is first used to cure the mold material. It is possible to accurately set the size of the tool. Therefore, each end face is uniformly heated and melted, and the pressure bonding is also uniformly performed. Therefore, it is possible to obtain an accurate welded surface without distortion or displacement.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the device of the present invention.

2 is a front view of the device of FIG. 1. FIG.

FIG. 3 is a perspective view of a main part of the apparatus shown in FIG.

FIG. 4 is a process explanatory view showing an operation sequence of the apparatus of FIG.

FIG. 5 is a front view showing an embodiment of a heater cleaner according to the present invention.

[Explanation of symbols]

 4 slide table 7 slide plate 8 slide plate 12 jig 13 grip mechanism 16 jig 17 grip mechanism 19 positioning plate 20 heating plate 34 cleaner member

Claims (4)

[Claims] 1. (a) a pair of mold members to be welded,
A pair of holding means for holding the end surfaces facing each other, and (b) reciprocating the pair of holding means in opposite directions so as to take a position where the end surfaces are in contact with each other and a position where the end surfaces are apart from each other. And (c) a position reciprocally driven relative to the holding means so as to have a position interposed between the end surfaces of the mold material held by the holding means and a position deviated from the position. A mating plate, and (d) a position interposed between the end faces of the mold material held by the holding means,
An end face welding device for a soft profile member comprising the holding means and a heating plate which is reciprocally driven so as to take a position deviated therefrom. 2. The apparatus according to claim 1, wherein the holding means can hold the mold material in an inclined state with respect to the alignment plate, in order to weld the end surfaces of the mold material having inclined end surfaces. 3. The holding means and the reciprocating drive means are provided on a slide table that reciprocates in a direction perpendicular to the moving direction of the holding means, and the heating plate comprises:
The slide plate is fixed upright along the moving direction of the slide plate, so that the positioning plate moves up and down through an opening formed in the slide plate,
The device according to claim 1, wherein the device is provided so as to be interposed between the end faces in a raised position. 4. (a) a pair of mold members to be welded,
A pair of holding means for holding the end surfaces facing each other, and (b) reciprocating the pair of holding means in opposite directions so as to take a position where the end surfaces are in contact with each other and a position where the end surfaces are apart from each other. Heating means, and (c) heating that is reciprocally driven relative to the holding means so as to take a position interposed between the end surfaces of the mold material held by the holding means and a position deviated therefrom. The plate and (d) when the holding means is reciprocally driven relative to the heating plate, the plate moves relative to the heating plate together with the holding means, and both sides of the heating plate when the holding means are brought close to each other. An end face welding apparatus for a soft profile member, which comprises a pair of cleaner members that are opened and closed in conjunction with a means for reciprocally driving a holding means so as to contact both surfaces of a heating plate when they are separated from each other and separated from each other.