JPS6356852B2 - - Google Patents

Abstract

PURPOSE:To make automatic and efficient welding when a plurality of resin moldings are welded mutually to produce finished goods by a method wherein lapped parts of the moldings are welded with a welder provided with support devices and a movable hot platen and the like. CONSTITUTION:A pallet 16 to be welded on which a plurality of resin moldings are lapped in the form of finished goods is supplied into the welder and each half part 16a, 16b of the pallet 16 to be welded is supported respectively by the support devices 11a, 11b. Then, the hot plate 12 is brought between each half part 16a, 16b of the pallet 16 to be welded supported by the support devices 11a, 11b, the welding surfaces of each half part 16a, 16b of the pallet 16 to be welded are fused, the hot plate 12 is returned, the support devices 11a, 11b are operated and each half part 16a and 16b are welded and subsequently pushed out from the welder by another pallet to be weld supplied from the supply device to the welder.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for welding synthetic resin molded products, and more specifically, the present invention relates to a method for welding a synthetic resin molded product, and more specifically, to weld upper and lower half molded products made of synthetic resin to obtain a single finished product. This invention relates to a method for automatically welding overlapping parts of molded products to each other.

BACKGROUND OF THE INVENTION It has been conventional practice to obtain a product by welding together the upper and lower halves of a synthetic resin molded article (hereinafter simply referred to as a molded article), for example, a molded article made by injection molding or extrusion molding. As an example, when molding a pallet of synthetic resin molded products, the conventional pallet molding method, in other words, the welding method, involves a worker holding the upper and lower halves of a pallet that have been molded separately by injection molding or extrusion molding. stack them to form a completed palette,
The pallet is gently carried into the holding frame of the welding device, and the overlapping surfaces are heated and welded by the welding device, and then the operator carries out the pallet that has been welded and is located in the holding frame, and again. This was done by carrying unwelded pallets into a holding frame.

However, such pallet welding methods depend too much on the operator, and therefore pose a major problem in terms of production efficiency.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional drawbacks, an object of the present invention is to
It is an object of the present invention to provide a method for welding a synthetic resin molded product by quickly joining upper and lower halves of the molded product made of synthetic resin to obtain one finished product.

To summarize the method for welding synthetic resin molded products of the present invention, it is a method of welding upper and lower half molded products made of synthetic resin to each other in order to obtain one finished product. , Loading a plurality of sets of molded products each consisting of upper and lower halves of the molded product superimposed on each other in a finished product state, and supplying the molded products to the welding device by sequentially moving the molded products one by one in the horizontal direction; The supplied material is provided at the upper end of a lower protruding member that protrudes from a lower holding frame of a molded product holding frame that is provided in the welding device and is spaced apart from each other vertically and is movable relative to the lower holding frame. supporting a set of molded products above the lower holding frame; and then press-fitting and holding the upper and lower halves of the molded products into the upper holding frame and the lower holding frame, respectively; separating the molded products in the upper and lower halves by moving the frame; then, inserting a heating plate between the molded products that have been separated from each other and heating their mating surfaces; then removing the heating plate and separating the upper and lower molded products; crimping and welding; after welding the set of molded products, the upper holding frame is moved upward; and the upper protruding member movable relative to the upper holding frame is moved by the movement of the upper holding frame. At the same time, the finished product is moved relatively into the upper holding frame to separate from the upper holding frame and held only by the lower holding frame, and the lower holding frame is moved downward to remove the finished product from the lower holding frame. The projecting member is relatively advanced into the lower holding frame to separate the finished product from the lower holding frame, and the finished product in the welding device is moved to the lower side in the same manner as when receiving the set of molded products. supporting the finished product in the welding device by the upper end of the lower projecting member above the holding frame; and then partially extruding the finished product in the welding device by feeding the next set of molded products into the welding device. The method further includes pulling out the partially extruded finished product from the welding device and transporting it to the next process.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The method for welding synthetic resin molded products according to the present invention will be described in more detail below with reference to the accompanying drawings showing an apparatus for welding synthetic resin molded products by the method. The embodiments of the method for welding synthetic resin molded products of the present invention described below relate to a welding method for forming a pallet as an example of a synthetic resin molded product, and also relate to an apparatus for welding synthetic resin molded products, which will also be described. The same is true. Therefore, in the following description, the synthetic resin molded product will be simply referred to as a pallet.

In FIG. 1, an apparatus for welding molded articles by the synthetic resin molded article welding method according to the present invention is generally designated by the reference numeral 10. This welding device 10 includes a pair of holding devices 11a and 11b 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. 5), and the It consists of protruding members 13a, 13b arranged inside each holding device 11a, 11b.

Each of the holding devices 11a, 11b includes a press plate 14 and a holding frame 15 provided on the press plate. The holding frame 15 has an internal shape that is substantially the same as the external shape of the pallet 16', which is formed by overlapping and welding semi-molded products that are divided into two halves on one side, one above the other, but slightly smaller in size. It is formed like this. Further, the holding frame 15 is formed into an inclined surface that opens outward at a connecting portion between the distal end surface and the inner surface, that is, at a partition edge.

This configuration of the holding frame 15 is preferable for smoothly press-fitting the half portion of the unwelded pallet 16 into the holding frame 15, and also compresses the half portion to a specified size to prevent warping or shrinkage. This is effective in preventing misalignment between the two halves due to

The holding devices 11a and 11b are connected to the support frame 18 via cylinder devices 17a and 17b, respectively.
is attached to. As a result, the holding devices 11a and 11b 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 each holding device 11a, 11b in order to accurately and stably move each holding device 11a, 11b in a predetermined direction, that is, in the present embodiment, vertically.

Further, each of the horizontal beams 20a, 20b in both the upper and lower parts of the support frame 18 has a plurality of protruding rods 21a, 2 constituting a protruding member.
1b is erected. The protruding rod 21b attached to the upper beam 20b is the piston rod of the cylinder device 22 fixed to the beam 20b and is therefore itself movable. On the other hand,
A protruding rod 21 attached to the lower beam 20a
a is a rod fixed to the support frame 18; These upper and lower protruding rods 21a and 21b are connected to the pressing plate 14 of each holding device 11a and 11b.
The holding frame 15 is arranged to enter the area defined by the holding frame 15 through a hole formed in the holding frame 15 .

In particular, the protruding rod 21a is connected to each holding device 11a, 1
When the pallets 1b are spaced apart to the maximum and are in a state of receiving the unwelded pallet 16 (the state shown in FIGS. 1 and 2a), their upper ends protrude at the same level as or higher than the upper surface of the holding frame 15. It is assumed to have a length dimension. The upper end of each protruding rod 21a on the side where the unwelded pallet 16 enters the welding device 10 is chamfered.

When welding unwelded pallets 16 using such a welding device 10, welding devices 11a, 11 of the welding device 10 are connected to a supply source 24 which loads unwelded pallets 16 and supplies them as appropriate, which will be described later.
A set of the unwelded pallets 16 is fed between the areas b. At this time, the unwelded pallets being fed can be delivered by a plurality of protrusions from the sides of the welding device 10 without the holding frame being an obstacle, since the protruding rod 21a protrudes higher than the upper surface of the holding frame 15 in the holding device 11a. It is placed on the rod 21a while sliding it (Fig. 2a). At this time, since the upper edges of the protruding rods 21a are chamfered on the entry side of the pallet 16, each protruding rod 21a 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 thus placed on the protruding rod 21a is placed in a position aligned with the holding frame 15 by the positioning device 25. Then,
This positioning device 25 is removed from between the holding devices 11a and 11b as described later, and the holding device 11a is removed from between the holding devices 11a and 11b.
is raised by the cylinder device 17a, and at the same time the holding device 11b is also lowered by the cylinder device 17b, so that the respective holding devices approach each other (FIG. 2b). At this time, as the holding device 11a rises, the protruding rod 21a relatively comes out of the holding frame 15, and therefore the pallet 16 is moved to the holding frame 15 by the approach thrust of each holding device 11a, 11b.
(Fig. 2c). That is, the lower half of the pallet 16 is attached to the holding frame 15 of the holding device 11a.
Inside, the other upper half part is the holding frame 1 of the holding device 11b.
5, respectively.

Next, in the holding devices 11a and 11b which press-fit and hold each half of the pallet 16, only the upper holding device 11b is raised and returned to its original position, that is, the position shown in FIG. 1, by the operation of the cylinder device 17b. Figure 2 d). The reason for this is that when the lower holding device 11a descends, the protruding rod 21a moves into the holding frame 15 due to relative movement, and the pallet 1
This is because half of the number 6 is pushed out.

When the two halves of pallet 16 are thus separated as shown in FIG. 2d, heating plate 12 (FIG. 5) is moved and placed between them. Then, the lower holding device 11a is further raised and the upper holding device 11b is lowered so that the joining surface of the half portion of the pallet 16 comes into contact with the heating plate 12. As a result, as shown in FIG. 2e, the joint surfaces of each half of the pallet 16 that are in contact with both sides of the heating plate 12 are melted and then separated from the heating plate 12 again, at which time the heating plate 12 returns to its original state. It returns to the standby position (Fig. 2 f). Then, only the upper holding device 11b is lowered to bring both halves of the pallet 16 into contact with each other, and the thrust of the cylinder device 17b and the other cylinder device 17a are applied via the bottom plate serving as the pressing plate 14 of each holding device 11a, 11b. A relative pressing force, that is, a pressing force is applied to both halves by the supporting force (Fig. 2g).

As a result, both halves of pallet 16 are welded together. After that, the upper holding device 11b
The protruding rod 21b, which had been moved together, is made immobile by the cylinder device 22, and the holding device 11
Increase only b. As a result, the protruding rod 21b is moved relative to the holding frame 15 as shown in FIG.
This will push the pallet 16 out. The lower holding device 11a is then also lowered, so that the pallet 16 is pushed out from it by the entry of the relative protruding rod 21a into the holding frame 15. Of course, in practice, welded pallets 1
6 is stationary on the protruding rod 21a, and only its holding frame 15 is lowered to return to its initial position (FIGS. 1 and 2a).

In this way, the welded pallet 16' is
Since it is supported by the protruding rod 21a that protrudes at the same level as or higher than the upper surface of the holding frame 15 in the holding device 11a, the welding device is pushed out by the unwelded pallet 16 that is supplied next. 10 to the side exit side without any hindrance.

Next, FIGS. 3a and 3b show the steps explained in FIG. 1.
The construction of a device 25 for positioning the unwelded pallet 16 at a predetermined position between the holding devices 11a and 11b in the welding device 10 is shown. This positioning device 25 is provided as a symmetrical pair on the front side and the back side of the welding device 10 in FIG. 1.
However, since the pair of positioning devices 25 have the same configuration, the positioning device 25 disposed on the front side will be described.

The positioning device 25 is the protruding rod 2 of the welding device 10.
A pair of holding parts 32 are arranged on both sides so as to hold the pallet 16 fed onto the pallet 1a between the front side and the back side as seen in FIG. The holding portion 32 is a vertical plate-like member parallel to the side wall of the pallet 16 and extends along the side wall. A slot 33 extending in the longitudinal direction is formed in such a clamping part 32, and a stop member 34 having an L-shaped cross section is provided on the inside of the clamping part 32, that is, on the side opposite to the other clamping part, by means of a bolt inserted through the slot 33. Fixed.

This clamping part 32 has an arm 36a formed integrally with it and pivotally supported by a pivot 35 in order to open the clamping part 32 away from the pallet so as not to interfere with the next process when the pallet 16 is positioned. This pivot 35 is arranged on a base plate 37 which is mounted in place on the support frame 18 on the pallet discharge side of the welding device 10. However, at this time, the position of the central axis of the pivot 35, that is, the chain line 38 drawn through the central axis in the pallet feeding direction, is the position of the flange portion 3 extending inwardly of the stop member 34.
It must be inside the edge of 9. this is,
If the central axis of the pivot 35 is located outside the end of the flange 39, when the clamping part 32 pivots around the pivot 35 to the open position, the flange 39 will have a rotational trajectory that pushes back the pallet. The purpose is to draw.

Such pivoting of the clamping part 32 is caused by an arm 36b extending in a V shape with respect to an arm 36a pivotally supported on a pivot shaft 35 to a piston rod 41 of a cylinder device 40 mounted on a base plate 37. This is caused by the operation of the cylinder device 40, which is pivotally mounted. Support frame 1 for base plate 37
8, a plurality of slots 42 extending in the width direction of the pallet (a direction transverse to the direction of movement of the pallet) are formed in the base plate, and the support frame 18 is screwed through the slots 42. It depends on the tightening force of the bolts. The presence of the slot 42 formed in the base plate 37 and the slot 33 formed in the clamping portion 32 allows pallets of various sizes to be accommodated. That is, movement of the base plate 37 along the slot 42 adjusts the opposing spacing of the stop members 34 (corresponding to the width of the pallet) and the movement of the stop member 34 along the slot 33
Movement along the pallet can precisely adjust the stopping position of the pallet (corresponding to the length of the pallet).

Next, FIGS. 4a and 4b show an unwelded pallet 16.
A fixing device 43 is shown which secures one half of the pallet 16 within each retaining frame 15 for safety when it is press-fitted into the retaining frame 15 of the retaining device 11a, 11b.

This fixing device 43 includes a locking piece 45 that can protrude laterally into a partitioned area of the holding frame 15 through an opening 44 made in the side of the holding frame 15. The movement is caused by a first link whose each end is pivotally connected to a piston rod 47 of a cylinder device 46 mounted on the side surface of the press plate 14 on which the holding frame 15 is mounted, and a locking piece 45. Part 4
8a and the locking piece 4 of this first link member 48a
In order to cause the end to be pivoted to 5 to move approximately linearly, this is done by a second link member 48b having one end pivoted to the middle of the link member 48a and the other end pivoted to the press plate 14.

As a result, the unwelded pallet 1 is placed inside the holding frame 15.
When the half part of 6 is press-fitted, the cylinder device 4
6 is activated and the first and second link members 48
a and 48b are moved to make the locking piece 45 protrude from the opening 44 of the holding frame 15 and insert it into the fork insertion hole of the pallet 16. As a result, the half of the pallet press-fitted into the holding frame 15 does not come out of the holding frame.

Next, in the synthetic resin molded product welding method according to the present invention, the supply source 24 that supplies unwelded pallets 16 to the welding device 10 while being set will be explained.

A supply device serving as a supply source 24 is installed on the side of the welding device 10 as shown in FIG. 1, and the supply device 24 is equipped with a lifter 65. On the support plate 66 of the lifter 65, unwelded pallets 16 are stacked with the upper and lower halves 16a and 16b facing each other to form a set of pallets.

As shown in FIG. 5, this feeding device 24 is provided with a plurality of devices 67 for correcting misalignment of pallets arranged to protrude toward the upward movement path of the pallet group. This orthodontic device 67 basically consists of two pivotably cantilevered
two arms 68a, 68b, and a roller 69 rotatably supported by the tips of these two arms.
and weights 70a and 70b that restrict the upward pivoting movement of this arm.

Two such straightening devices 67 are arranged on each side of the unwelded pallets 16 stacked in groups on the support plate 66 of the lifter 65.

To briefly explain the function of this correction device 67,
The rollers 69 carried at the ends of the arms 68a, 68b are positioned so that, when the arms are in the horizontal position, they contact the sides of the unwelded pallets 16 that are accurately stacked at the reference position. As a result, if there is a pallet 16 that deviates from its reference position and rises with its sides protruding,
Its protruding sides tend to lift said roller 69. However, this roller 69 has weights 70a and 70 attached to arms 68a and 68b.
Since a predetermined amount of rotational torque is applied to pivot downward due to the position 0b, the incorrectly aligned pallet 16 will be pushed back due to the magnitude of this rotational torque.

Therefore, the weights 70a and 70b are connected to the arm 68.
The more the tips of the arms a and 68b, that is, the closer to the roller 69, the greater the rotational torque of the arm, and as a result, the roller 69 will move toward the protruding unwelded pallet 16.
The force that tries to push the side of the body horizontally increases.

However, if there is an unwelded pallet that protrudes abnormally and the position cannot be corrected by this straightening device, the excessive lifting of the arms 68a, 68b is detected by a phototube or a limit switch, and the feeding device 24 is adjusted. The system will stop functioning and the abnormally stacked unwelded pallets will have to be re-stacked manually.

As shown in FIG. 1, two such straightening devices 67 are arranged on each side (four sides) of the unwelded pallet. In addition, the correction devices 67' arranged on the front side and the back side as seen in FIG.
The principle is the same as the type of the straightening device 67 described above, except that the weights 70a and 70b are attached to the rollers 6.
9 are attached to both sides.

In this way, the vertical alignment of the unwelded pallets stacked in groups on the support plate 66 of the lifter 65 is achieved during the lifting process of the unwelded pallets by the lifter. Therefore, the upper and lower half portions 16a and 16b of the pair of unwelded pallets 16 that have been raised to a predetermined position at the top of the supply device 24 are completely aligned and superimposed.

The set of unwelded pallets 16 that have risen to a predetermined position at the top of the supply device 24 are transferred to the protruding member 13a of the welding device 10 by the transfer device 76, as shown in FIGS. 1 and 5. be moved up. The transfer device 76 has rollers 77a on both sides,
77b and is movably disposed on the pedestal 71. A motor (see FIG. 1) is mounted on the pedestal 71 at the rear of the cart 78.
is arranged, and the drive shaft 79 of the motor is connected to the chain 8
0 rotates the driven shaft 81. This driven shaft 8
1 and a shaft 82 arranged on a frame 71 near the entrance to the welding device 10, a chain 83 is encircled, and the ends of the chain 83 are connected to the front and rear ends of a cart 78 of the transfer device 76, respectively. ing.

As a result, in the carriage 78 of the transfer device 76, the driven shaft 81 is rotated by the drive of the motor, and the chain 83 is rotated by the rotation of the driven shaft 81, so that the cart 78 runs on the frame 71 in the direction of the welding device 10. A shock absorbing device 84 consisting of an air cylinder is attached to this cart 78 so as not to apply an excessive impact when pushing the side surface of the uppermost unwelded pallet 16.
Furthermore, this trolley 78 has running rollers 77a, 7
Arms 85a and 85b are provided extending from both ends of the pallet 7b to both sides of the unwelded pallet 16. These arms 85a, 85b are provided with clamping devices 86a, 86b, respectively, consisting of air cylinders extending toward the unwelded pallet 16, and thereby clamp the uppermost unwelded pallet 16 from the sides.

In this way, the unwelded pallet 16 that has arrived at the uppermost predetermined position of the supply device 24 is clamped by the cart 78 of the transfer device 76, and is fed into the welding device 10 as the cart 78 moves. Ru. In addition, in FIGS. 1 and 5, reference numerals 87a and 8
Members 7b and 87c are provided upright to guide the corners of the support plate 66 of the lifter 65 to prevent wobbling in its vertical upward movement. Among these guide members, a member having an L-shaped cross section designated by reference numeral 87c is fixedly supported at the tip of the piston rod of the air cylinder device 88 so that its position can be changed depending on the size of the support plate 66.

Next, as is clear from FIG. 5, a heating device 90 for simultaneously melting the welding surfaces of each half of the unwelded pallets 16 held by the holding devices 11a and 11b is installed on the back side of the welding device 10. The holding device 11 of the welding device 10 is arranged adjacent to the welding device 10.
The heating plate 12 is moved in and out between the half portions 16a and 16b of the unwelded pallet 16 which are vertically separated by a and 11b, respectively.

By using such a heating device 90, the welding device 10
The heated plate 12 moved in melts the joint surfaces of each half of the unwelded pallet 16, and then each of these halves 16a, 16b is moved into the holding device 11a after the heated plate 12 is returned to the heating device 90. , 11b, the welding and joining are performed. The pallet 16 that has been completely welded by the welding device 10 is pushed out of the welding device 10 by unwelded pallets that are subsequently supplied from the supply device 24.

As shown in FIG. 1, the pallet 16 pushed out from the outlet side of the welding device 10 is completely removed from the welding device 10 by a feed roller device 105 attached to the outlet side support frame 18 of the welding device 10. The paper is pulled out and moved on the transport roller conveyor 106 toward the next process device.

As described above, according to the method for welding synthetic resin molded products of the present invention, all that is required is to combine unwelded molded products into a finished product and load multiple sets, and the rest is automatically welded and transferred to the welding device. It can be sent from there to the next process. As a result, a plurality of molded articles made of synthetic resin can be joined quickly to obtain one finished product, and moreover, the molded articles can be continuously welded and molded by this method.

[Brief explanation of drawings]

FIG. 1 is a front view showing a welding device for carrying out a pallet welding method as an embodiment of the method for welding synthetic resin molded products of the present invention together with its attached equipment;
Figures a to 2h are fragmentary longitudinal cross-sectional views showing the process of welding molded products by the welding device, and Figures 3a and 3b show unwelded pallets held at predetermined positions between the holding devices of the welding device. A plan view showing the device for positioning the device and a plan view partially cut away along line b-b, FIGS. 4a and 4.
Figure b is a partial plan view and a sectional view taken along the line b--b showing a fixing device for fixing half of an unwelded pallet placed in a holding frame;
FIG. 2 is a plan view from above of the welding device and its attached devices shown in the figure. 10... Welding device, 12... Heating plate, 13a,
13b... Projection member, 15... Holding frame, 16...
Unwelded pallet, 16'... Welded pallet (finished product), 16a, 16b... Half part of unwelded pallet, 24... Supply device, 76... Transfer device.

Claims (1)

[Scope of Claims] 1. A method of welding upper and lower half molded products made of synthetic resin to each other to obtain one finished product, comprising: loading a plurality of sets of molded products formed by overlapping each set of products in a finished product state, and supplying the molded products to a welding device by sequentially moving each set one by one in a horizontal direction; The set of supplied molded products is held at the upper end of a lower protruding member that protrudes from the lower holding frame of the molded product holding frames arranged vertically at intervals and is movable relative to the lower holding frame. supporting above the lower holding frame, and then press-fitting and holding the upper and lower halves of the molded product into the upper and lower holding frames, respectively, and moving the upper and lower holding frames to separate the upper and lower halves; separating the molded products of the section from each other; then, inserting a heating plate between the molded products that have been separated from each other and heating their mating surfaces; then removing the heating plate and press-bonding the upper and lower molded products to weld them; , after welding the set of molded products, the upper holding frame is moved upward, and the upper protruding member movable relative to the upper holding frame is moved relative to the upper holding frame as the upper holding frame is moved. Entering the finished product into the upper holding frame and separating it from the upper holding frame and holding it only by the lower holding frame; Moving the lower holding frame downward to relatively move the lower protruding member. The finished product is moved into the lower holding frame and separated from the lower holding frame, and the finished product in the welding device is placed above the lower holding frame in the same manner as when receiving the set of molded products. supporting at the upper end of a lower projecting member; then partially extruding the finished product in the welding device by feeding a next set of molded articles to the welding device; A method for welding a synthetic resin molded product, the method comprising: pulling out the partially extruded finished product and transporting it to the next process.