JPS6023021B2 - Welding part heating and repair device in welding equipment for synthetic resin products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for heating and repairing a welded part in a welded layer of a synthetic resin product, mainly a synthetic resin pallet.

2. Description of the Related Art Synthetic resin pallets for loading or transporting various types of cargo have conventionally been used in shapes as shown in FIGS. 1 and 2.

The ones in Figure 1 are rectangular welded parts la and lb of a certain standard.
The fork insertion hole 2 is formed by a groove formed in each overlapping surface. In addition, in the pallet shown in FIG. 2, the welded area la
, lb are welded on the top and bottom, and other welded parts 4a, 3b are welded on the front, back, left and right end surfaces.
4b, 5a, and 5b, and fork insertion holes 6a, 6b are provided in the front-back and left-right directions.

The pallet having the above structure, for example, as shown in Fig. 1, has mounting parts 7 and 8 which have upper and lower and horizontally opposing surfaces, and the mounting parts la and lb are each fixed to the opposing surfaces as shown in Fig. 3. A hot plate 9 is inserted horizontally between these welding surfaces, and after both welding surfaces are pressed and melted, the hot plate 9 is pulled out and pressure welded.

In addition, in the structure shown in FIG. 2, following the welding work similar to the above for attaching the parts 3a and 3b, a mounting base 12, which is horizontally driven by cylinders 10, 11, etc., as shown in FIG. 13, the welded parts 5a and 3a, 3b are fixed with pressers 14, 15, etc. so that the welded surfaces thereof face each other, and a hot plate 16 that can be brought into close contact with both surfaces at the same time is inserted from above and below between both welded surfaces. , the welding surface is melted and welded in the same manner as above. However, with these conventional welding structures and methods, the large size of the parts increases the size of molds and molding machines, inefficiencies in welding work, roughness in dimensional accuracy errors,
There were problems such as the impossibility of automatic settling, and a solution was required.

Therefore, as described below, the present inventor developed a welding layer that solves the above problems and realizes automation of welding work.
The present invention aims to provide an apparatus that uniformly heats and melts the welding surface of the parts in the welding layer and corrects the subsequent deformation caused by the swelling of the welded portion.

Hereinafter, a detailed description will be given based on the illustrated embodiments.

The present invention was invented in the process of developing a method and apparatus for automatically welding welding parts a, ~a5, which are divided into a plurality of parts (for example, 4 to 7 parts) in the same direction as shown in FIG. First, an automatic pallet welding method will be explained with reference to FIGS. 6 to 9. FIG. 6 shows the state of the surface on which welded parts a, ~, are layered and settled on the corresponding mounting bases 21-25, and the upper surface of each mounting base 21-25 is horizontal and Each one is arranged horizontally parallel to the front-rear direction. Among each stand, the stand 23 located in the center is fixed to the device main body 56, which will be described later, and the other stands 21,
22, 24, and 25 each have a structure that allows horizontal movement (running or sliding drive) in the left and right directions. 31
〜35 is a presser which presses the part a, 〜tortoise onto the bases 21〜25, and the front and rear portions of each presser 31〜35 are located at approximately the center of the lower surface, and when the tortoise is pressed, each component a, 〜 also holds the upper surface. A projection 26 is attached to the recess (not shown) for positioning the parts a, . . . on the tables 21 to 25.

To counterfeit several pieces of each part a to the above-mentioned device, the seventh
As shown in the left side view of the figure, first, the front pressing tool 27 is tilted forward, and the welded parts a and -foundation are automatically inserted from the front by a comper 28 or the like onto the stands 21 to 26, respectively.
Raise the front pressing tool 27 with a cylinder or the like and press parts a, ~
Push the sparrow into the stopper 29 on the rear and fix it.

At the same time, the holding tools 31 to 35 apply pressure to each part a, to the fish, and the projections 26 fix the parts in a predetermined position. Next, before starting the next welding process, in order to improve the fit of parts a, to a5 on the tables 21 to 25, the respective driving devices move the tables 21, 22 and 24, 25 horizontally toward the table 23. The welding surfaces of each part a, to a5 to be adjacent to each other are pressed together once.

Thereafter, each of the machines 21 to 25 and the parts a, to a5 are separated again at a constant interval into the state shown in FIG. At this time, the right side plate 30 attached to the right side stand 25 rises and comes into close contact with the side surface of the part, and the left side plate 36 is placed on the left side of the part a in the stereotaxic layer by the cylinder 37 provided on the stand 21. It is pressed against the surface. Next, the hot plates 38 to 41 located at intermediate positions between the parts a and ~a5 are inserted between the facing surfaces of the parts a and ~a5, and then the tables 21, 22 and 24, 25
are pushed toward the stand 23, and each part a
, ~ The welding surfaces of the tortoises are simultaneously pressed against the hot plates 38 to 41. As a result, a certain portion of the deposited surface is heated and melted until it reaches the welding state necessary for welding. At this time, in order to prevent the welding surface from melting more than necessary, two upper and lower parts are placed at appropriate positions on the tops of the hot plates 38 to 41 and on the pressers 31 to 35 and between each 21 to 25.
Contact stops (all shown in the description of the device) are provided. Also, at this time, the hot plates 38, 39
and 40, 41 are also interlocked with the tables 21, 22 and 24, 25 in the same direction. When the welding surfaces are melted in the above operation, the tables 21, 22, 24, 25 and the hot plates 39 to 41 are separated in the opposite direction, and the hot plates 38 to 41 are separated.
is pulled upwards as shown in FIG.
, 22 and 24, 25 are pushed toward the center again, and the adjacent welding surfaces of parts a, .

It should be noted that if any of the welding surfaces come into contact with each other before the others before welding, there is a risk that the deposition state of the entire product will become uneven, so as will be clearly explained in the explanation of the device later (Fig. 12), A gap maintaining mechanism between the stands 21 to 25 is provided to prevent the welding surfaces from touching each other inadvertently until pressing during twilling.

As a result of the above-described welding, a bulge of flesh generally occurs on the upper and lower surfaces of each welded portion, and it is therefore necessary to correct this bulge and make it flat. Accordingly, as shown in FIG. 9, correction odors 42 provided at the lower ends of the hot plates 38 to 41 are pressed against each other through gaps of a certain size provided between the respective pressers 31 to 35 to form a flat surface. Also, a similar correction tool 43 is pressed against the bottom surface of the product to correct the swelling of the meat. Z As shown in FIGS. 11 and 12, this shaving tool 42 includes a trowel 83 whose end face forms a horizontal plane along the sanding part, and a second trowel 83 that is fixed close to the trowel and circulates cooling water inside the trowel 83. A cooling mechanism consisting of heavy cooling pipes 81 and 82 is provided, and the modified surface is finished into a flat Z surface by a lever 83 and cooled at the same time.
Other correction smells 43 also have a similar structure. The product that has been settled and the upper and lower surfaces have been corrected as described above is cooled until the welded part has stable strength.
35 etc. are loosened or released, the right side plate 30 is lowered to close the right side of the product, and the cylinder 37 pushes out the product from the opening and releases it.

Incidentally, in the above-mentioned method, the method of carrying parts into the mounting base and discharging the product is not limited to the method described above, but can be easily changed in any of the front, back, left, and right directions according to convenience.

Next, welding and refitting used in the above method will be explained based on FIGS. , the functions of each part that have already been explained are omitted for the sake of brevity).

FIG. 10 is a front view showing an outline of the welding layer according to the present invention, in which four poles 45 are installed on a pet 44 on which various devices are placed, forming a device body (frame) 56. There is.

At the bottom of the mounting bases 21, 22 and 24, 25, there is a frame 51 with a cart that can move freely so that they can move left and right.
52, 54, and 55 are attached, and a fixed frame 53 is provided at the lower part of the mounting base 23. 47, 48, 49, 5
Reference numeral 0 denotes a cylinder for driving the respective frames 51, 52, 54' and 55 with carriages, and is fixed to the main body of the apparatus.

Also, in the left and right direction of the main body 56, there are support stand frames 51 and 5.
A guide bar 57 that slidably guides the movement of the frames 2, 54, and 55 is installed horizontally so as to penetrate through each frame.

On the mounting frames 52 and 54, there is a cylinder 6 for lifting and pressing the lower product landing surface correction tool 43 mentioned above.
2 is provided.

As is clear from the drawings, the welding surface correction smell 43 is located on the mounting base frames 52 and 54 with carts, and is always located directly below the position where the welding surfaces are butted against each other, and the mounting bases 22 and 24
moving in unison. Cylinders 58 to 61 are cylinders for raising and lowering the hot plates 38 to 41, and are fixed in the vertical direction to four holders 63, which are located on the left and right sides within the frame 46, respectively.

The holder 63 is slidably joined to a guide bar 64 installed in the horizontal direction within the frame 46, and is guided by the guide bar 64 in its left and right movement. Therefore, each hot plate 38
41 are also driven in the left and right direction together with the respective holders 63.

Reference numeral 65 is a cylinder that drives the holder 63 in the left-right direction, and is fixed to the pedestal 46, and in this embodiment, one or more cylinders are provided for each holder.

Further, the holders 63 are each driven in the left-right direction in correlation with the mounting base driving cylinders 47 to 50 described above. FIG. 11 is a view from the arrow A-A in FIG.
41 is attached inside the hot plate frame 66, and in addition to the rod of the hot plate driving cylinder 59 being attached to the upper part of the hot plate frame 66, the rod of the hot plate driving cylinder 59 can be slid freely inside the holder 63. A guide bar 67 that extends vertically through the hot plate frame 66 and moves up and down together with the hot plate frame 66 is fixed thereto, and holds the hot plate 39 vertically up and down.

The presser 32 is fixed to pressing cylinders 70, 71 via brackets 68, 69 in the front and rear, and the cylinders 70,
71 is fixedly provided on the bed 44 of the main body of the apparatus. The front bracket 68 of the brackets has a closing portion for inserting parts from the front side of the device. In addition, the holding plate 27 at the front end of the mounting base 22 is pivoted by a cylinder 86 provided under the holding plate 27 so that it can be rotated in an upright or horizontal state, and when inserting a component, it It is in a horizontal state. FIG. 12 is an enlarged front partial sectional view showing main parts of the cascading heating of parts immediately after welding and its control mechanism, and for convenience of explanation, the left and right sides are shown in different operating states.

That is, the left half A shows the state of the welded parts a3 and a4 when the press twill is fixed and the upper and lower surfaces of the welded parts are corrected, and the right half B shows the state of the welded parts ridge 4 and the welded surface when the welding part is heated. It represents. In the right half B of FIG. 12, the heating plate 41 is lowered and inserted between part a4, and each welding surface is brought into close contact with the left and right sides of the heating plate 41 and is in a state of heating and melting, and at this time, the corresponding correction is made. The odor 43 is lowered by the cylinder 62 to a position where it does not interfere with its heating.

Reference numerals 72 and 73 are adjuster stars (or stoppers) for regulating the melting of parts, which are protruding from both sides of the upper part of the hot plate frame 66, the upper part of the presser holder 34, and one side of the presser 35. When descending for heating and melting, they face each other at the same height, and for the melting, parts strength 4,
When the tortoise is pressed and melted by a predetermined dimension, the adjusters 72 and 73 are brought into contact at the same time to prevent further melting and dimensional errors and uneven bonding strength when the product is completed. ing.

This mechanism can be implemented by electrical control such as a limit switch. Dissolution regulation adjuster 72, 7 above
A similar adjuster is provided at the bottom of each mounting base 24, 25 along with 3, but after melting the welding surface of other parts, the hot plate 41 is removed from the lower adjuster, and then the next press settling is performed. During this time, the melting surface (welding surface) of each part
A spacing mechanism is also provided to prevent comrades from inadvertently touching each other.

That is, the lower adjusters 74 and 75 are provided on both sides of the mount frame 54 and the opposing surfaces of the other adjacent mount frames 53 and 55, and the adjuster 74 on the frame 54 side is provided on the cylinder fixed thereto. 76, and when the welding surfaces of the parts are pressed together to be melted, the upper adjuster 72 is pushed up to the same height as the opposing adjuster 75.
, 73, the frames 51 to 55 (mounting bases 21 to 25) are brought into contact with each other to prevent the interval between them from narrowing below a certain dimension.

In other cases, adjuster 7 as shown in Figure 12A.
4 is lowered by a cylinder 76. next,
To explain the state shown in FIG. 12A, in this state, following the state shown in FIG.
55 is pushed toward the center, and the parts a and ~ are pressed together and twilled.Furthermore, at the same time as the welding of the welded parts is carried out, the correction odor 42 is again released together with the hot plate. The tool 43 is lowered and then raised to come into pressure contact with the welded part, and the unevenness protruding from the surface of the welded part is corrected. In order to prevent errors in size and shape and welding strength due to the parts being appropriately pressed together during the landing, the frame 54 is provided with the lift adjuster 74.
Behind the adjuster 75 and other corresponding adjusters
77 is provided, which also serves as the spacing mechanism described above and functions in a similar manner.

That is, in the adjuster star 77, a contact pin 79 is provided whose tip is always projected by a spring 78 to face the other adjuster 75 having a fixed size. After the adjuster 74 is lowered and the hot plates 38 to 41 are raised, the adjuster 75 is moved to the adjuster 7 on the frame 54, 52 side in the process of pressing the parts a, ~ to weld together for welding.
7, the frame 51 to 55 is stopped in that state until it comes into contact with the pin 79 and the pressing force increases to a certain level or more (the spacing between the parts welded surfaces is also maintained at the same time).
When the pressing force applied to the spring 78 exceeds a certain level, the spring 78
The pin 79 is pushed in against the elasticity of the adjuster 7.
5,77 is supporting it.

With the help of the adjusters 75 and 77, the frames 51~
55 does not approach any further, welding is also stopped here, and the predetermined dimensions of the product are maintained. Numeral 80 is a bolt for adjusting the elasticity of the spring 78.

The adjuster 77 with the pin 79 and spring 78 inserted therein as described above can be used when the mounting frames 51, 52, 54, 55 are individually and interrelatedly driven by separate cylinders as in the illustrated embodiment. may be relatively unimportant.

This is because if the cylinder drive is performed accurately according to the set values, it is thought that there will be relatively few inadvertent contacts of the welding surfaces. However, when each frame 51 to 55 has a certain degree of freedom to run and move, for example, in the case of a mechanism in which each frame is connected by a pantograph-like link or connected by a guide pin and made to run and move by one cylinder, etc. The mechanism of the adjuster 77 as described above or a mechanism replacing it is always essential. 1st
FIG. 3 is a partially omitted enlarged side sectional view showing an example of the structure of the welding surface correction smell 42 attached to the lower ends of the hot plates 38 to 41. Double cooling pipes 81 and 8Z2 are fixedly installed in the same manner, and a correction iron 83 is fixed to the lower end surface thereof.
The lower surface of the iron 83 forms a horizontal surface.

The insides of the cooling pipes 81 and 82 have a structure in which cooling water or other cooling fluid circulates.For example, the tip of the inner pipe 81 is closed at the end inside the outer pipe 821, and the outer pipe 8
Cooling fluid supplied from the water supply port 84 at the other end (rear end) of 2 enters the inner pipe 81 inside the front end, and flows through the water drain port 8 at the rear end of the inner pipe.
5 and is discharged. The iron 83 is cooled by such a cooling mechanism, and the welded portion of the component 2 is also effectively cooled after correction. Incidentally, although not particularly shown, the repairing tool 43 on the lower surface of the part welded has the same structural function as the above-mentioned correction odor 42, and each correction odor has a length that is pressed over the entire length of the settling part. Needless to say.
2. Also, in the explanations of FIGS. 10 to 12, specific mounting bases, mounting frame frames, pressers, hot plates, correction odors,
Although various stoppers and the like have been described, descriptions of other corresponding parts of the same type are omitted because they have almost or completely the same structure and function.

At the same time, although in the illustrated embodiment the drive devices for the various parts are mostly cylinders, they do not have to be cylinders in particular, and other drive devices can be used, or the individual drives of the hot plates can be combined into a single interlocking system. It may also be driven. As a result of the above-described configuration of the welded part heating and repairing device of the present invention, it is possible to easily mold even a large pallet with a relatively complicated internal structure using small parts, and to produce high-strength, high-precision pallets at low cost. This is the main part of a fully automatic pallet dropping device and makes it possible to realize this.

In particular, during automatic welding of synthetic resin pallets, it enables uniform and simultaneous melting of many parts welding surfaces, and after welding, it continuously automates the correction of bulges on the upper and lower surfaces of the welding part, and automatically fixes this part. Since it is cooled, it has a good cooling effect and is extremely efficient compared to the conventional method.

[Brief explanation of the drawing]

Figures 1 and 2 are both perspective views showing a conventional synthetic resin pallet welding structure; Figures 3 and 4 are explanatory front views showing an example of a conventional synthetic resin pallet welding method; 5
The figure is a perspective view showing an example of a synthetic resin pallet molded by the automatic welding device according to the present invention. Figure 6 is a front view showing the state of the parts before welding, Figure 7
8 is a plan view showing the same state at the time of welding, and FIG. 11 is a front view showing the same state at the time of welding and correction of the upper and lower surfaces of the welded part. Fig. 10 is an extracted front view of essential parts showing an outline of the automatic welding layer according to the present invention, Fig. 11 is a view taken along arrows 10A-A, and Fig. 12 is an enlarged front view showing the structure and operating state of the device of the present invention. In the cross-sectional views, Figure A shows the state when the parts fall, Figure B shows the state when the welded surface is melted, and Figure 13 is a partially omitted cutaway side view showing the structure of the device of the present invention. be. la, lb
...Welded parts, 2...Fork insertion hole, 3a, 3b, 4a, 4b, 5a, 5b...Welded parts, 6a, 6b...Fork Insertion hole, 7,
8...Mounting stand, 9ri...Heating plate, 10...
...Cylinder, 12,13...Mounting stand, 1
4, 15... Presser, 16... Hot plate, 21
~25... Mounting base, 26... Positioning protrusion, 27... Pressing tool, 28... Competition 0a, 29... Stopper , 30...
・Side plate, 31-35... Presser foot odor, 36...
...Side plate, 37...Cylinder, 38-41.
...Hot plate, 42,43...Correction tool, 44
...Pet, 45...Pole, 46...Track, 47-5
0...Cylinder, 51-55...Event...Mounting frame,
56...Device body (frame), 57...Guide bar,
58-62...Cylinder, 63...Holder, 64...
... Guide bar, 65 ... Cylinder, 66 ... Heat plate frame, 67 ... Guide bar, 68, 69 ... Bracket 0, 70, 71 """ Cylinder, 72, 75 ... Adjuster star (stopper), 76 ...Cylinder, 77...
...Adjustment star (stopper), 78... Spring, 79... Pin, 80... Adjustment bolt, 81, 82... Cooling pipe, 83...・
Trowel, 84...Water inlet, 85...Drain port, 86...Cylinder, a, ~...Welded parts. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13

Claims (1)

[Claims] 1 One completed product is divided and molded into three or more parts in advance, and the welded parts placed on the top are pressed together to form an integrated product by welding the welded surfaces of these welded parts. In a welding device that has a plurality of mounts in which at least two or more parts to be welded can move horizontally in the same direction, and a hot plate that moves up and down between the mounts to melt the welding surfaces of each welded part, the mounts are One mounting base is attached to a fixed frame, and the other multiple mounting bases are attached to a movable frame that moves horizontally from left and right around the fixed mounting base, and the hot plate is linked in the same direction as the horizontally moving mounting base. At the same time, it is installed above the mounting base so that it can be raised and lowered, and furthermore, a cooling pipe for circulating the refrigerant is interposed at the lower end of the hot plate, and a surface correction tool consisting of a trowel with the lower end as a horizontal end surface is attached, and the above-mentioned mounting A fixing tool of the same shape as the surface fixing tool is installed below the table so that it can be raised and lowered freely, and each opposing surface of the adjacent mounting frame is provided with a fixing tool that can be pressed during welding to prevent careless welding surfaces. A welding heating and correction device for a welding device for synthetic resin products, which is equipped with a spacing holding mechanism to prevent contact, and a contact stopper to prevent the spacing between each mounting base from narrowing below a certain dimension.