JP2000211028A - Synthetic resin pallet and welding device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To minimize the dimensional difference between welding part side surfaces and correct the warpage and twisting of a pallet in the synthetic resin pallet formed by butt- welding a left and a right parts together by a method wherein positioning holes along the parting line of the left and the right parts and positioning holes along the direction normal to the parting line are provided on the left and the right parts. SOLUTION: Both the upper and lower deck boards 1 and 3 are connected with each other through beams 5, which are parallel to their side surfaces and provided at both the end parts, and beams 7 at the middle parts of the boards so as to form through holes surrounded by the boards and the beams serving as the entries of forks. In this two way entry pallet, both the upper and the lower parts 10 and 11 are divided by a parting line a parallel to a loading surface. At the same time, both the left and the right parts 10a, 11a, 10b and 11b are divided by a parting line b parallel to the side surface of the pallet. At the same time, the divided surfaces of the divided parts are butt-welded. On the left and the right parts of either one of both the upper and the lower parts 10 and 11, respective positioning holes 13 and 15 are provided with the parting line between. In the respective positioning holes 13 and 15, the positioning pins provided on a pressing plate in a welding device are inserted so as to absorb the shrinkage amounts of the left and the right parts 10a and 10b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin pallet in which the side surfaces of a left part and a right part, which are semi-finished products, are brought together and welded together, and the left part and the right part are horizontally moved and butted. The present invention relates to a welding device for a synthetic resin pallet that is integrally formed by welding.

[0002]

2. Description of the Related Art Conventionally, in the production of synthetic resin pallets,
There is a method of integrally molding with an injection molding machine, and a method of dividing and molding a plurality of semi-finished products in advance, and butt-welding the welding surfaces of these parts to integrally mold.
The method of integrally molding by butt welding is to divide the pallet into a plurality of semi-finished parts by dividing lines parallel to the side surfaces, and set the divided parts with their divided surfaces facing each other, There is a method in which a divided pallet is melted and then butt-welded to obtain a completed pallet. Also,
As another method of butt welding, there is a method in which a pallet is divided and formed in parallel with the loading surface of the pallet, and the divided surface of the spar is melted and then butt welded to obtain a completed pallet.

A synthetic resin pallet used in the butt welding method and a welding apparatus therefor are disclosed, for example, in Japanese Utility Model Publication No. Sho 60-28576 and Japanese Patent Publication No. Sho 61-50770. The invention described in Japanese Utility Model Publication No. 60-28576 discloses a method in which a part formed in parallel with the side surface is held in a fixed frame that moves horizontally, and a heating plate that moves up and down is inserted therebetween to heat and melt. The fixing frame is retracted, the heating plate is raised, and the fixing frame is horizontally moved and pressed again to butt and weld together. In the invention described in Japanese Patent Publication No. 61-50770, an upper part and a lower part which are divided into upper and lower parts are fixed to a pair of opposing pressing plates, and the welding surface thereof is brought into contact with a heating plate provided to be able to move forward and backward. Heating and melting are performed, then the pressing plate is opened and the heating plate is retracted, and then the pressing plate is approached again and the upper part and the lower part are crimped together to butt and weld together.

[0004]

Problems to be Solved by the Invention
In the invention described in Japanese Patent Application Laid-Open No. 6-64, the size of the fixed frame is determined in accordance with the size of the part formed by division, and when the size of the part is changed, the fixed frame must also be changed. Therefore, there is a problem in that a welding device in which the fixing frame is changed according to the size of the component must be manufactured.
On the other hand, in the invention described in Japanese Patent Publication No. 61-50770, a holding frame provided on a pressing plate is formed by a fixed frame and a moving frame,
Since the entire size is adjusted by moving the moving frame horizontally in the diagonal direction, it is not possible to butt-weld a plurality of parts formed in parallel with the side surface.

[0005] By the way, the size of a synthetic resin pallet is also required to be increased due to the requirement of transportation efficiency. In such a large pallet, for example, the pallet is first divided in parallel with a loading surface at a beam portion. In addition, a method is employed in which a divided portion is formed in a central portion in parallel with the side surface, and these four parts are integrally welded to obtain a completed pallet. As described above, when the upper and lower parts are welded to the left and right parts, first, the upper and lower parts are welded according to the above-mentioned Japanese Patent Publication No. Sho 61-5.
Although the welding apparatus described in Japanese Patent Application Laid-Open No. 0770 can be applied, the left and right parts cannot be welded. Also,
The apparatus described in Japanese Utility Model Publication No. Sho 60-28576 has a problem that it cannot cope with the size of parts as described above.

[0006] It is known that a molded article made of a synthetic resin is warped or twisted due to shrinkage or deformation with the passage of time after molding. These warpages and twists are large in a large-sized molded product such as a synthetic resin pallet. Therefore, if welding is performed simply with reference to one surface, a large dimensional difference appears in the opposite side.

The present invention has been made in view of the above-mentioned point, and an object of the invention is to minimize the dimensional difference between the side surfaces of a welded portion even in a synthetic resin pallet in which left and right parts are butt welded. Another object of the present invention is to provide a synthetic resin pallet capable of correcting a warp or a twist to achieve welding and a welding device for the pallet.

[0008]

The present invention has the following configuration to achieve the above object. That is, the synthetic resin pallet according to the present invention is a synthetic resin pallet formed integrally by butt-welding left and right parts divided by a dividing line parallel to a side surface of the pallet. Two rectangular positioning holes along the direction of the dividing line, and a position substantially at an intermediate position between the two positioning holes and at a substantially intermediate portion of the length of the dividing line along a direction orthogonal to the dividing line. A rectangular positioning hole is provided, and the positioning hole is provided symmetrically in the left part and the right part with a dividing line interposed therebetween.
The rectangular positioning hole along the direction orthogonal to the dividing line can be provided at a position farther from the dividing line than two positioning holes parallel to the dividing line.

A welding apparatus according to the present invention is a welding apparatus for a synthetic resin pallet in which left and right parts divided by a dividing line parallel to a side surface of a pallet are butt-welded to each other, with the divided surfaces of the parts facing each other. It has a pair of pressing mechanisms that hold it horizontally, and a heating mechanism that is located between the pressing mechanisms and that has a heating plate that can move up and down between the components, and the pressing mechanism mounts the welding portion side of the components. A mounting table to be placed, comprising a pressing plate that can move up and down above the mounting table, and arranged on a lower surface of the pressing plate in parallel to a side surface of the pressing plate,
Two parallel holding positioning pins for holding the welding surfaces of the two parts in parallel, and a position substantially at the middle between the two parallel holding positioning pins, and a dimensional error of the two parts from the center of the dividing surface to both side ends. It is characterized in that it is provided with a distribution positioning pin that is distributed. The distributing positioning pins may be protruded at a position farther from the heating plate side than the two parallel holding positioning pins.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on an embodiment shown in the drawings. First, a synthetic resin pallet used in the present invention will be described. FIG.
Connects the upper deck board 1 and the lower deck board 3 with the girders 5 at both ends and the girders 7 at the center parallel to the sides,
2 shows a two-way pallet in which a through hole surrounded by the upper deck board 1, the lower deck board 3, and the girders 5 and 7 serves as a fork insertion port 9. The two-way pallet,
The part is divided into upper parts 10 and lower parts 11 at the spar 5 and 7 by a dividing line a parallel to the loading surface of the pallet. And left parts 10a, 11a and right parts 10b, 1
1b, and the divided parts are butt-welded with their divided surfaces facing each other.

[0011] Of the left part 10a and the right part 10b constituting the upper part 10 or the left part 11a and the right part 11b constituting the lower part 11, the left part or the right part of one of the upper part 10 and the lower part 11 is formed. The parts are provided with positioning holes 13 and 15 with the dividing line B interposed therebetween. That is,
As shown in FIG. 11, a rectangular positioning hole 13 slightly separated from the dividing line B and along the direction of the dividing line B,
A rectangular positioning hole 15 is provided on a line C which is substantially intermediate between the positioning holes 13 and the positioning holes 13 and 13 and is approximately at the middle of the length of the dividing line B.
The positioning holes 13 and 13 and the positioning hole 15 are
The left component 10a and the right component 10b are provided symmetrically.

Positioning pins provided on a pressing plate of a welding device to be described later are inserted into the positioning holes 13 and 13 and the positioning hole 15. The positioning hole 1
Numerals 3 and 13 are for positioning the welding surfaces of the left part 10a and the right part 10b in parallel with the dividing line B, and the positioning hole 15 is provided at a substantially middle position of the length of the dividing line B. This is for positioning the central parts of the left component 10a and the right component 10b on the orthogonal line C.

The operation of the positioning holes 13 and 13 and the positioning hole 15 having the above configuration will be described.
Since a and the right part 10b shrink and deform toward the center of the part after molding, they are formed so that even if the amount of shrinkage changes, they can be absorbed during welding. That is, positioning hole 1
Reference numeral 5 is on the line C and is formed vertically long in the direction of the line C. Therefore, even if the amount of shrinkage changes, it is always distributed from the center to both ends, so that the dimensional difference in the side end surfaces can be minimized. On the other hand, positioning holes 13,
13 is provided along the dividing line B, and is fixed parallel to the dividing line B opposite to the positioning hole 15.

By providing the positioning holes 13 and 13 symmetrically in the vicinity of the dividing line B, the same welding device can be used even when the size of the parts to be butt welded is changed. That is, even if the size of the component is changed, the positions of the positioning holes 13 and 13 and the positioning holes 15 are always provided at a fixed size from the dividing line B, so that the positioning holes 13 and 13 and the positioning holes 15 are formed.
Since the position of the positioning pin on the pressing plate of the welding device does not need to be changed as long as the component can be provided with the size, the size is not affected by the size of the component.

Next, a welding apparatus according to the present invention will be described in detail based on an embodiment shown in the drawings. The welding apparatus according to the present invention includes a component carrying mechanism 20 for carrying in a welded part, a product carrying out mechanism 20a for carrying out a welded product, pressing mechanisms 21 and 21a for pressing and fixing the carried-in part, and a part on a heating plate. The component press-fitting mechanisms 22 and 22a are separated from each other, and the heating mechanism 23 further heats the welded surfaces of the components so as to be able to come and go between the pressing mechanisms 21 and 21a. Component crimping mechanism 22, component unloading mechanism 20a, pressing mechanism 21a, component crimping mechanism 2
2a is substantially symmetrical with respect to the heating mechanism 23.

The component loading mechanism 20 comprises a component loading section 24 for transporting components onto the slide table 101 for horizontally moving the bed 113, and a component holding section 25 for fixing the loaded components at a predetermined position. , The component unloading mechanism 20
a is a slide table 101a for horizontally moving the bed 113;
A component unloading unit 26 that unloads a product having components welded thereon,
Component holding portion 25a for fixing the carried component in a predetermined position
Is provided. In the above configuration, the slide base 101, the component carry-in section 24, the component carry-out section 26, and the component holding section 25,
25a are formed substantially in the same manner, and are arranged in an opposed state. Therefore, the component carrying-in mechanism 20 and the component carrying-out mechanism 20a are substantially the same on the left and right with the heating mechanism 23 interposed therebetween. In the following description, for the sake of simplicity, the same components are denoted by the same reference numerals, and description thereof will be omitted.

Hereinafter, each mechanism will be specifically described.
First, the component carry-in section 24 constituting the component carry-in mechanism 20
And the component holding section 25 will be described. The component loading section 24 will be described with reference to FIGS. 1, 2, 4, and 5. FIG. In the illustrated embodiment, the component carry-in section 24 includes a plurality of belt conveyor devices. In the belt conveyor device, a belt 144 is stretched around a driving pulley 146 and a tail pulley 147, and a rotation shaft 148 for driving the driving pulley 146 is provided with a belt wheel 149, and is driven by a motor 151 via a belt 150. Driven. The rotating shaft 148 is rotatably mounted on a bearing 153 fixed on the slide table 101. The tail pulley 147 is mounted on a bearing 157 integrally fixed to a support plate 155, and a rod 160 of an air cylinder 159 provided substantially vertically on the slide table 101 is fixed to a lower surface of the support plate. .

As described above, the bearing 1 of the tail pulley 147
Since 57 is supported by the air cylinder 159, the air cylinder 159 operates and the rod 160
The belt 144 is also moved up and down at the same time by moving back and forth. That is, when the air cylinder 159 operates, the bearing 157 moves up and down so as to slightly rotate about the rotation shaft 148. Therefore, if the upper surface of the belt 144 is positioned slightly higher than the upper surface of the mounting table 121 when the rod 160 is extended, the conveyed components can be directly mounted on the mounting table 121, and the rod 160 Belt 1 when retracted
By making the upper surface of 44 slightly lower than the upper surface of the mounting table 121, it is possible to separate from the components mounted on the mounting table. The configuration of the component carry-out section 26 is the same as that of the component carry-in section 24, and is provided to face the component carry-out section 24.

Next, as shown in FIG. 1, FIG. 2, FIG. 6, and FIG. The locking plate 163 that locks to the lower surface of the holding arm 161 when the erected member is upright and holds the erected state is the ball nut 1.
65. The holding arm 161 has one end connected to a rotating shaft of a motor 167 and the other end fixed to a rotating shaft 169 supported by the other end. Is fixed to the slide shaft 171.

The holding arm 161 is higher than the parts when it is raised, but the belt 1
It is located below the upper surface of the component 44 and is configured to enable the component carrying unit 24 to carry components. The rotation shaft 169 and the slide shaft 171 are attached in parallel so as to be orthogonal to each other below the component loading section 24, and the motor 167 and the air cylinder 170 are attached integrally to a ball nut 165 located outside. Stand 1
73 (see FIG. 2).

In the above configuration, when the motor 167 is operated, the holding arm 161 is moved up and down via the rotating shaft 169, and when the air cylinder 170 is operated, the slide shaft 1 is moved.
The locking plate 163 slides integrally with the slide shaft 171 via 71. The clamping arm 161 and the locking plate 163
And the like are disposed on the ball nut 165, so that they move forward and backward together with the ball nut 165. The ball nut 165 is screwed into a ball screw 175, and a linear guide 177 provided on the lower surface of the ball nut 165 is engaged with a traveling rail 179 laid on the slide table 101. Therefore, the ball nut 1
65 is the travel rail 1 by rotation of the ball screw 175.
You will move up and down 79.

The ball screw 175 is driven to rotate by a motor 180 as shown in FIGS. That is,
A timing belt 185 is wound between a sprocket 181 fixed to the rotation shaft of the motor 180 and a sprocket 183 fixed to the ball screw 175. It is configured to be wound and sequentially rotated and driven by a motor 180. Therefore, when the motor 180 is operated, the ball screws 175 are driven to rotate via the timing belts 185, 190, and 191.
5 moves back and forth on the running rail 179.

The component holding section 25 of the component carrying mechanism 20a
a has the same configuration as that of the component holding portion 25 and is disposed so as to face each other. Therefore, the distance between the opposing holding arms 161, 161 can be adjusted to be wide and narrow by operating the motor 180 and driving the ball screw 175.

Next, the pressing mechanisms 21 and 21a will be described. The pressing mechanism 21 has columns 120, 120 erected at both ends of the slide table 101 on the heating mechanism 23 side, and mounts the mounting tables 121, 121 on which the components provided on the column 120 are mounted. And a pressing plate 122 for pressing and fixing between the mounting table 121 and the mounting table 121. Table 121 described above
Are horizontally and integrally attached to the inside of the columns 120, 120, and have a notch 123 into which the tip of the component carrying-in section 24 is inserted, as shown in FIG. The upper surface of the mounting table 121 is formed to be slightly lower than the upper surface of the component carrying-in portion 24 which is pushed up as described later, and is configured so that components can be transferred by the component carrying-in portion 24.

At both ends of the mounting table 121, width shift plates 124 for positioning both sides of the loaded component are provided. The width shift plates 124, 124 are provided so as to be slidable in a direction in which they are separated from and brought into contact with the component carry-in portion 24, and are fixed in advance according to the width dimension of the component so as to sandwich the component from both sides.

On the other hand, above the mounting table 121, a pressing plate 122 having substantially the same size as the mounting table is disposed substantially horizontally. The pressing plate 122 is connected to rods 128 of air cylinders 127 and 127 which are mounted downward on a mounting plate 126 provided on the upper end of the support 120.
Further, guide pins 129 and 129 projecting upward through the mounting plate 126 are provided on the upper surface of the pressing plate 122 outside the air cylinders 127 and 127, and components are formed on the lower surface of the pressing plate 122. Positioning hole 13,
Positioning pins 130 and 130a to be inserted into the projection 15 are protruded. When the air cylinders 127 and 127 operate, the pressing plate 122 is moved up and down while maintaining the horizontal state by the guide pins 129 and 129 slidably penetrating the mounting plate 126. When the component is carried in and the pressing plate 122 is lowered, the positioning pin 130 is moved to the positioning hole 1.
3 and the positioning pin 130a is inserted into the positioning hole 15
It is configured to be inserted into.

Next, the component crimping mechanism 22 will be described. The component crimping mechanism 22 has the component loading mechanism 20 and the pressing mechanism 21 mounted thereon, and moves the component so as to be separated from and brought into contact with the heating plate. As shown in FIGS. 1 to 3, ball nuts 104 and 105 are attached to the lower surface near the corner on the opposite side of the slide base 101. A ball screw 106 is attached to the ball nut 104, and a ball screw 106 is attached to the ball nut 105. Are screwed with ball screws 107, respectively.
A high-speed motor 108 is fixed to an end of the ball screw 106 via a clutch, and is rotatably driven by the motor 108 in a forward / reverse direction.

The ball screw 106 and the ball screw 107
Has sprockets 110 and 111 fixed thereto,
The wound chains 112 are simultaneously driven to rotate together. Further, on the lower surface of the slide table 101, parallel running rails 114, 1
The linear guides 115, 115 that engage with 14 are fixed. With the above configuration, when the high-speed motor 108 operates and the ball screw 106 is driven to rotate, the ball screw 107 is also driven to rotate simultaneously by the chain 112 wound around the sprockets 110 and 111.
The slide base 101 has screwed ball nuts 104, 10
5 to move on and off the traveling rails 114, 114.

The component crimping mechanism 22a is substantially the same as the component crimping mechanism 22 except that the high-speed motor 10
8 is changed to a low-speed motor 116. Further, as shown in FIGS.
Gears 117 and 118 are attached to the distal ends of the components 06 and 107, respectively.
7 is driven to rotate integrally.

That is, when the high-speed motor 108 operates, the clutch on the low-speed motor 116 side is disengaged.
The ball screw 106 of the component carrying mechanism 20 and the ball screw 10 of the component carrying mechanism 20a are driven by a high-speed motor 108.
The ball screw 107 of the component carrying mechanism 20 rotates via the chain 112 at the same time as the unit 7 rotates. Conversely, when the low-speed motor 116 operates, the clutch on the high-speed motor 108 side is disengaged, and the low-speed motor 11
6, the component carry-in mechanism 20 and the component carry-out mechanism 20a.
Ball screws 106 and 107 can be integrally rotated. Thus, the ball screw 10 of the component loading mechanism is
6, 107 and ball screws 106, 107 of the component unloading mechanism
And rotate at the same time.

Next, the heating mechanism 23 will be described. As shown in FIGS. 1 and 3, the beam members 132, 132 erected in parallel to the upper ends of the columns 131, 131 erected on the bed 113 are connected. The air cylinders 134, 134 are attached downward to the connecting member 133, and the rods 136, 136 of the air cylinders 134, 134 have a heating plate 139 via a suspension member 138.
It is constituted by hanging 0. Frame 140
Is a pin 141 with a pair of springs wound on its upper end.
When the part is melted by elastic holding by a spring, it can swing right and left to adjust the position.

Further, on the upper surface of the suspending member 138,
The guide pins 142, 142 are used to raise and lower the suspension member 138 in a horizontal state.
It is provided inside. Guide pins 142, 142
Is slidably inserted into a connecting plate that connects the beam members 132, 132 at right angles. The heating plate 139 of the heating mechanism 23 having the above-described configuration includes a pressing plate 122 of the pressing mechanisms 21 and 21a,
The heating plate held by the frame 140 is disposed between the components held by the pressing mechanism when the heating plate is lowered.

The construction of the above welding apparatus has been described.
Next, a method of using the above device will be described. First, the interval between the width approaching plates 124 of the component carrying-in mechanism 20 and the component carrying-out mechanism 20a is adjusted according to the width dimension of the component to be welded.
In addition, the inner surface of the slide table 101 on the component unloading mechanism 20a side is positioned outside the frame 140 of the heating mechanism 23 according to the length dimension of the component to be welded, and the clamping arm of the component clamping portion 25a is placed. The position 161 is set at a predetermined position. The locking plate 163 is slid by the operation of the air cylinder 170 of the component holding portion 25 on the component loading mechanism 20 side to release the engagement state with the holding arm 161, and the holding arm 161 is laid down by the operation of the motor 167. . Further, the frame 140 having the heating plate 139 of the heating mechanism 23 and the pressing plate 122 are raised and placed.

Then, the motor 151 of the component carrying-in section 24 is operated to rotate the belt 144 in the carrying-in direction, and the motor 151 of the component carrying-out section 26 is operated to rotate the belt in the carrying-out direction. The left side component to be welded is placed on the belt 144 of the component carry-in portion 24 such that the welding surface of the left component is on the heating mechanism 23 side. Further, the other right-side component to be welded is placed so that the welding surface faces the heating mechanism 23 side.
On the belt 144 of FIG. Both parts are belt 1
When the left component is transported by the component 44 and reaches the mounting table 121, it is pushed by the right component and the belt 14 of the component unloading mechanism 20a is moved.
4 and stops upon contacting the holding arm of the component holding portion 25a. The rear end face of the right part is the clamping arm 16
1, the motor 167 is operated to erect the holding arm 161 and the air cylinder 17
0 is operated to slide the locking plate 163 and insert it into the lower end surface of the holding arm 161 to lock it.

After the holding arm 161 of the component loading mechanism 20 is erected as described above, the motor 180 of the component loading mechanism 20 is operated to operate the timing belts 185, 190,
Each ball screw 175 is driven to rotate via 191 and the ball nut 165 is moved to the heating mechanism 23 side. The ball nut 165 travels on the traveling rail 179, and presses the two parts by the two opposing clamping arms 161 so that the welding surfaces thereof abut each other. By the pressing of the welding surface, the welding surface can be adapted in advance. At this time, the welding surface of the two parts is
Protruding from the end face. Next, while the two parts are held by the holding arm 161,
The support plate 155 is lowered by operating the air cylinders 159 of the component 4 and the component unloading section 26, and the upper surface of the belt 144 is pulled down below the upper surface of the mounting table 121 to hold the component on the mounting table 121.

After the component is held on the mounting table 121, the air cylinder 127 is operated to lower the pressing plate 122, and the positioning pin 130 is provided on the component.
And the positioning pin 13a is inserted into the positioning hole 15. Then, the mounting table 121 and the pressing plate 12
2 and fix the part between them. As described above, the positioning holes 1 with the positioning pins 130 and 130a provided in the parts are provided.
By inserting the components 3 and 15, the welding surfaces of the components are held in parallel, and the centers of the welding surfaces of the components in the width direction coincide with each other.

Thereafter, the high-speed motor 108 is operated to move the slide tables 101 and 101 backward to separate the two parts from each other. When the high-speed motor 108 operates, the ball screws 106 and 107 are simultaneously rotated by the chain 112, so that the slide base 101 can run smoothly without a twisting load on the running rail 114. When the high-speed motor 108 operates, the clutch on the low-speed motor 116 side is disengaged. After separating the two parts, the air cylinder 134 is actuated to lower the frame 140 having the heating plate 139 so that the heating plate 1
39 is opposed to the welding surface of the two parts.

After lowering the heating plate 139, the high-speed motor 108 of the component carrying-in mechanism 20 is actuated to bring both parts into close proximity by a fixed amount, and then switched to the low-speed motor 116 of the component carrying-out mechanism 20a. Slowly approach 23.
At this time, the clutch on the high-speed motor 108 side is disengaged, and the ball screws 106 and 107
12, the slide table 101,
101a can run smoothly without a twisting load on the running rail 114. Since the component is held between the mounting table 121 and the pressing plate 122 and the end surface of the component is pressed by the holding arm 161, the component remains fixed without being displaced even when a pressing force is applied to the heating plate. It can be crimped to a heating plate.

The welding surfaces of the left and right parts are pressed against the heating plate for a predetermined time to melt the butted surfaces of the parts. After the mating surfaces of the parts are melted by a certain amount, the slide tables 101 and 101a are retracted and separated by the operation of the high-speed motor 108, and at the same time, the air cylinder 13 of the heating mechanism 23
4 is operated to return the heating plate 139 to the original position.
Once again, the high-speed motor 108 is operated to bring the two parts into close proximity by a fixed amount, and then the low-speed motor 116 is switched to gradually bring the two parts closer together and welded together to obtain an integrally completed pallet.

After the welding is completed, the air cylinder 127 is operated to lift the pressing plate 122 to release the holding state with the mounting table 121, and further, the cylinder 159 is operated to raise the upper surface of the conveyor belt 144 higher than the mounting table 121. Push up to become. Next, the air cylinder 170 of the component unloading mechanism 20a is operated to slide the locking plate 163 horizontally to release the locked state with the holding arm 161. Thereafter, the motor 167 is operated to depress the holding arm 161. The pallet that has been welded is ready to be carried out. Next, the drive motor 151 of the component carry-in section 24 and the component carry-out section 26 is operated to carry out the welded pallet.
Hereinafter, the same cycle is repeated to weld the components.

As is apparent from the above description, the parts to be welded are simply placed on the parts carry-in portion 24 in a horizontal state, so that the parts can be easily carried in. Also, the width shift plate 124,
Reference numerals 124 are provided so as to be slidable in a direction in which they are separated from each other, and the holding arms 161 can be moved forward and backward, so that they can be switched in response to a change in the dimensions of components. Since it is configured to serve as both a component holding mechanism and a loading / unloading mechanism,
The mechanism can be simplified, and the components and the welded pallets can be transported in a horizontal state, so that they can be transported in a stable state.

[0042]

As described above, in a pallet which is integrally formed by butt-welding divided parts, two rectangular positioning holes along the direction of the dividing line are formed on the pallet, and the two positioning holes are substantially formed. Since a rectangular positioning hole is provided in the middle and substantially at the middle of the length of the dividing line and extends in a direction perpendicular to the dividing line, the parts to be abutted at the time of welding are always kept at an accurate position. be able to. In addition, by disposing the positioning hole near the dividing line, the positioning hole does not change even if the size of the component is changed.

Accordingly, there is no need to change the positioning pins to be inserted into the positioning holes in the welding device according to the size of the parts, and the same welding device can be used as it is. Further, by disposing the positioning hole near the dividing line, the pressing mechanism for projecting the positioning pin to be inserted into the positioning hole can be disposed on both sides of the heating plate. And positioning can be performed simultaneously.

[Brief description of the drawings]

FIG. 1 is an explanatory front view of the entire apparatus with a part omitted.

FIG. 2 is an explanatory longitudinal sectional view of the entire apparatus with a part omitted.

FIG. 3 is an explanatory cross-sectional view in which a part on a component loading side crimping mechanism side is omitted.

FIG. 4 is a perspective view showing a driving device of a component carrying mechanism and a component carrying mechanism.

FIG. 5 is a perspective view showing an elevating mechanism provided inside the component loading mechanism and the component unloading mechanism.

FIG. 6 is an explanatory perspective view showing an operation state of a component pressing arm.

FIG. 7 is an explanatory perspective view showing the operation state of the component pressing arm.

FIG. 8 is an explanatory plan view showing a drive mechanism of the slide base.

FIG. 9 is a partial explanatory view showing a driving device of the slide base.

FIG. 10 is a perspective view of a pallet in which positioning holes are provided in the vicinity of a dividing line and four parts are welded.

FIG. 11 is a plan view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper deck board 3 Lower deck board 5 Both ends girder 7 Center girder 9 Fork slot 10 Upper part 10a Left part 10b Right part 11 Lower part 11a Left part 11b Right part 13,15 Positioning hole 20 Parts loading Mechanism 20a Component unloading mechanism 21, 21a Pressing mechanism 22, 22a Component crimping mechanism 23 Heating mechanism 25, 25a Component clamping unit 26 Component unloading unit 101, 101a Slide table 104, 105 Ball nut 106, 107 Ball screw 108 High speed motor 110, 111 Sprocket 112 Chain 113 Bet 114 Running rail 115 Linear guide 116 Low speed motor 117, 118 Gear 120 Support 121 Mounting stand 122 Press plate 123 Notch 124 Width adjustment plate 126 Mounting plate 127 Air cylinder 128 Air Linder rod 129 Guide pin 130 Positioning pin 131 Support column 132 Beam material 133 Connecting material 134 Air cylinder 136 Rod 138 Suspension member 139 Heating plate 140 Frame 141 Pin 142 Guide pin 144 Belt 146 Driving pulley 147 Tail pulley 148 Rotating shaft 149 Belt wheel Belt 151 Motor 153 Bearing 155 Support plate 157 Bearing 159 Air cylinder 160 Rod 161 Nipping arm 163 Locking plate 165 Ball nut 167 Motor 169 Rotating shaft 170 Air cylinder 171 Slide shaft 173 Mounting base 175 Ball screw 177 Linear guide 179 Running rail 180 Motor 181 Sprocket 183 Sprocket 185 Timing belt 187, 189 Sprocket 1 0,191 timing belt

Claims (4)

[Claims] 1. A synthetic resin pallet formed by integrally butting and welding left and right parts divided by a dividing line parallel to a side surface of a pallet with respect to the side of the pallet. Two rectangular positioning holes, and a rectangular positioning hole substantially at an intermediate position between the two positioning holes and substantially at an intermediate portion of the length of the dividing line and extending in a direction orthogonal to the dividing line. A pallet made of synthetic resin, wherein the positioning holes are provided symmetrically in the left part and the right part with a dividing line interposed therebetween. 2. The method according to claim 1, wherein the rectangular positioning hole along a direction orthogonal to the dividing line is provided at a position farther from the dividing line than two positioning holes parallel to the dividing line. The synthetic resin pallet according to claim 1. 3. A welding device for a synthetic resin pallet for butt-welding left and right parts divided by a dividing line parallel to a side surface of the pallet, and a pair of pressing mechanisms for horizontally holding the divided surfaces of the parts in opposition. And a heating mechanism that is located between the pressing mechanisms and has a heating plate that can move up and down between the components, wherein the pressing mechanism includes a mounting table for mounting a welded portion side of the components, A pressing plate which is located above the mounting table and which can be moved up and down, arranged on the lower surface of the pressing plate in parallel with the side surface of the pressing plate, and two parallel holding members for holding the welding surfaces of the two parts in parallel; A positioning pin, and a positioning pin for distribution, which is located substantially in the middle between the two parallel holding positioning pins, and which distributes a dimensional error of the two parts from the center of the division surface to both side ends. Characteristic synthetic resin Pallet welding equipment. 4. The welding of a synthetic resin pallet according to claim 3, wherein the distribution positioning pins are provided at positions farther from the heating plate than the two parallel holding positioning pins. apparatus.