JPH08336866A - Form of resin-made pallet for compression molding and form and size variable mold structure - Google Patents

Abstract

PURPOSE: To facilitate handling of a resin-made pallet for compression molding by a method wherein a mold can be repayed because of small quantity production for many kinds of products, a structure of a combined cavity and outer frame is simple, and its manufacturing cost is low. CONSTITUTION: A minimum sized leg cavity A is divided in four parts to make two kinds such as A1 (having one circular ark-like corner) and A2 (having an inclination). Respective two pieces of those quartered cavities are combined to constitute respective leg cavities for a corner, an intermediate, and a center. Then, respective cavity blocks D having a fork-inserting mouth, a leg structure for fork inserting mouth, and a standardized fork inserting width as four sides are appropriately combined, and arranged inside the vertical and lateral variable sized outer frames 7, 10 to make a bottom force. They are combined for a top force in the same way as for the bottom force to form various sized resin- made pallet of four forms for insertion of four sides, insertion of two sides, using both surfaces, and using one surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold structure of a molding mold required for manufacturing resin-made carrier pallets. Specifically, there are four types of pallets in different fields of use of the pallet in one set of dies, and pallets of compression molding resin that can form pallets of different sizes in different pallets of this form. Dimensionally variable mold structure.

In addition to pallets, the shape and form of a compression molding resin pallet that can be used to make various types of molded products having constant heights such as concrete panels and different width and length dimensions And the variable size mold structure.

[0003]

2. Description of the Related Art Conventionally, it has been well known that labor saving in distribution in various industries and distribution industries has been a big problem, and that pallet transportation (palletization) has been a leading role.

Most of the conventional pallets are made of wood, but with the development of automatic distribution warehouses in recent years, it has become necessary to load and unload rack devices for storing and storing transport pallets.
Pallet dimensional accuracy is required. In addition, wood is easily soiled, it takes time to dry after washing, and if it is not sufficiently dried or becomes moist, it causes mold and the like, which is unsuitable from the viewpoint of hygiene. Therefore, the demand for hygienic resin pallets with high dimensional accuracy, easy cleaning and drying, no mold, etc. is increasing.

Further, the present invention relates to a method for changing the size of a molding die for a resin pallet and the die and the like.
There is JP-A-6-79757 related to the invention of the present inventor.

[0006]

In the past, since each user freely made and used various pallets of various sizes and various modes in wooden form, the wooden pallet does not have dimensional accuracy. There was a drawback that it was not suitable for automated physical distribution warehouses, etc., because it had stains and mold.

Further, in the case of resin pallets, not only those having different areas (sizes) but also those having different areas (sizes) are used because the dimensions of packaging boxes to be loaded, forklifts or handlifts are used when loading and unloading empty pallets. , The use of various forms of pallets is required. Among these various forms, there are four types of forklift or handlift pawls for carrying pallets, which are four-way insertion, two-way insertion, and two-sided use and one-sided use of these pallets.

Conventionally, in order to manufacture pallets of various sizes and various forms, it is necessary to manufacture many molds, such as one set for one molded product, and molding corresponding thereto. There was a problem that the number of molds was large.

Since one set of these resin-made pallet molding dies costs tens of millions of yen, the standard size pallets are generally in large demand and are manufactured in large quantities. Mold depreciation is easy and molds can be manufactured. However, many resin pallets out of the standard size have a small demand amount, and it is impossible to mold this kind of resin pallet from the viewpoint of mold amortization.

Further, the one disclosed in Japanese Patent Laid-Open No. 6-79757 can accommodate pallets of any size with one set, but the structure of the combination cavity and the structure of the outer frame are complicated, and the manufacturing cost is high. There was a drawback that it could not be applied to a pallet used on one side.

The present invention breaks the conventional wisdom that one set of pallet molding dies is conventionally required for one molded product, and makes it possible to amortize dies for production of a wide variety of products in small quantities. It is an object of the present invention to provide a mold structure whose shape and dimensions are variable.

Further, there is provided a compression molding resin pallet which has a simple structure of a combination cavity and an outer frame, is inexpensive to manufacture, and can be applied to a pallet for single-sided use, in which the drawbacks of JP-A-6-79757 are eliminated. It is an object of the present invention to provide a shape and a shape and a variable size mold structure.

Furthermore, since the resin pallet does not have the strictest requirement for color in comparison with general plastic products, it is possible to use recycled raw materials (industrial waste) as its raw material, and to promote recycling of industrial waste. To aim.

[0014]

In order to solve this problem, the present invention divides the corner leg, intermediate leg and central leg cavities in a pallet having the minimum required size to form a block. The fork insertion hole cavity is equal to one side of each divided leg, and a cavity block having a standardized fork insertion width is combined to form a fork insertion hole cavity block.

The leg cavity block, the fork insertion port cavity block, the fork insertion port leg forming cavity block, and the cavity block having four sides fork insertion width are appropriately combined.

The combined cavity block group is arranged in a vertical and horizontal outer frame to form a lower mold, and an upper mold corresponding to the lower mold is combined in the same manner as the lower mold, and a forklift pawl of a resin pallet is used. It is possible to form four-way pallets, two-way pallets, and four types of pallets of those resin pallets using both sides and one side.

Further, the corner leg, the intermediate leg and the central leg cavity in the pallet having the minimum required size are divided to form a block. The fork insertion hole cavity is equal to one side of each divided leg, and a cavity block having a standardized fork insertion width is combined to form a fork insertion hole cavity block.

A spacer block is interposed between the leg cavity block, the fork insertion port cavity block, and the fork insertion port leg forming cavity block. Then, each of these cavity blocks is appropriately combined with a cavity block having a fork insertion width of four sides.

These combined cavity block groups are arranged in an outer frame whose vertical and horizontal dimensions can be varied to form a lower mold, and an upper mold corresponding to this lower mold is combined in the same manner as the lower mold. , The forklift pawls of the resin pallet are four-way insert, two-way insert, and four types of pallets of two-side use and one-side use of the resin pallet can be molded, and the size of the resin pallet is variable.

Further, a plurality of support pillars are provided between the central portion and the side surface portion of the pressure receiving plate and the lower die mounting plate which are divided into three parts and can be expanded and contracted, and the pressure receiving plate and the lower die mounting plate are provided. It can be fixed vertically by these support pillars.

Then, assuming the maximum size of the pallet on both sides of the upper surface of the pressure receiving plate, a vertical outer frame which can be molded up to the maximum size is provided, and a lateral outer frame whose length can be expanded and contracted between the vertical outer frames. To provide.

The cavity block group is fixed by the vertical outer frame and the horizontal outer frame, the support pillar at the central portion is inserted and fitted, and it is vertically divided into three parts between the pressure receiving plate and the lower die mounting plate. Ejector plates are provided, and these ejector plates are telescopically fitted with a plurality of shafts.

A plurality of ejector pins are provided on these ejector plates so as to penetrate the pressure receiving plate and the cavity block group.

[0024]

As shown in FIG. 5, the leg cavity block is constructed by dividing the corner leg cavity, the intermediate leg cavity and the central leg cavity into four.

The leg cavity block, the fork insertion port cavity block, the fork insertion port leg-constituting cavity block, and the cavity block (D) having a standardized fork insertion width on four sides are appropriately combined. These combined cavity block groups are placed in the vertical and horizontal outer frames to form a lower mold, and the upper mold corresponding to this lower mold is combined in the same way as the lower mold, so these are mounted on the press machine. One side of the pallet can be molded by supplying the molten synthetic resin into the lower mold, combining it with the upper mold, and performing compression molding. These two compression-molded ones are appropriately stacked one on top of the other, and the end faces of the legs are aligned and joined by bolting or welding to make four types of two-way insertion, four-way insertion and single-sided use, double-sided use. Shaped pallets can be molded.

A horizontal outer frame is formed on both sides of the upper surface of the pressure receiving plate. The vertical outer frame, which can be molded to the maximum size assuming the maximum size of the pallet, is fixed so that the space between the vertical outer frames can be adjusted. Is provided, and the cavity block group is fixed by the vertical outer frame and the horizontal outer frame. Therefore, the structure is simpler than that of the conventional one (Japanese Patent Laid-Open No. 6-79757), a pallet for one side can be formed, and the combination of each cavity block can be performed in a shorter time than the conventional one.

Then, a support pillar at the central portion is inserted and fitted, and an ejector plate which is telescopically divided into three parts is provided between the pressure receiving plate and the lower die mounting plate and is integrated by a shaft that moves up and down. A plurality of T-grooves are vertically machined on the upper surface. The same number of elongated holes as the T-grooves are formed in the pressure receiving plate above each ejector plate at a position directly above the T-grooves. Therefore, through holes are provided in the lower mold cavity block that is always used, the heads of the ejector pins are inserted into the T grooves, and the through holes of these lower mold cavity blocks are inserted into the ejector pins. With this, it is possible to cope with the increase or decrease in the vertical dimension from the minimum dimension to the maximum dimension with the spacer block interposed.

Further, since the spacer block is interposed between each of the corner leg, the intermediate leg and the central leg cavity block, the corner leg, the intermediate leg and the central leg cavity block can be adjusted in size according to the size of the pallet. it can. Also, since a spacer block is interposed between the fork insertion port cavity block and the fork insertion port leg-forming cavity block, the fork insertion port of the 4-, 2-way pallet and the legs of the 2-way pallet must match the size of the pallet. You can adjust the size. Also, a leg cavity block whose size is adjusted according to the size of these pallets, a fork insertion port cavity block, a fork insertion port leg structure cavity block, and a cavity block (D) having a standardized fork insertion width on four sides Combine as appropriate. Then, these cavity block groups are arranged in an outer frame whose vertical and horizontal dimensions are variable to form a lower mold. As an upper mold corresponding to this lower mold, the upper mold cavity block having the dimensions of the lower mold cavity block group is combined in the same manner as the lower mold and fixed to the upper mold mounting plate. With these things, the forklift claws on the resin pallet are inserted in all directions,
There are four types of two-way insertion, and double-sided use and single-sided use of the pallets. At the same time, it is possible to mold a resin pallet in which the size of each pallet is variable. As a result, it is possible to provide a mold structure capable of producing a variety of resin pallets in small quantities.

As the outer frame, a plurality of support pillars are provided between the central portion and the side surface portion of the pressure receiving plate and the lower die mounting plate which are divided into three parts and can be expanded and contracted to attach the pressure receiving plate and the lower die. Plates are fixed to both ends of these support pillars. Then, a vertical outer frame is provided fixed to both sides of the upper surface of the pressure receiving plate, and a horizontal outer frame having a freely extendable length is provided between the vertical outer frames. Use to fix the cavity block group. Therefore, the length and width of the vertical outer frame and the horizontal outer frame can be adjusted according to the size of the pallet, and the lower mold of various sizes can be formed.

Further, the size of the upper die mounting plate is such that the maximum size of the pallet to be molded has a size of the mounting plate that can be molded, and a plurality of T-shaped elongated holes are formed in the vertical direction. Fix the mold cavity block from above the upper mold mounting plate with bolts. Further, in the case of changing to a single-sided pallet forming mold described later, it is also possible to change and use so that the convex surface of the cavity block of FIG. 9 is the lower surface. (In addition, the loading surface of four types of pallets,
That is, when molding the upper one surface, the convex surface of the cavity block in FIG. 9 is directed upward. ) Then, similarly to the above, various combinations of the upper mold cavity blocks of the lower mold cavity block group may be combined in the upper mold and fixed to the upper mold mounting plate.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A detailed description will be given below with reference to the accompanying drawings showing an embodiment of the form and form of a resin pallet for compression molding and a variable size mold structure according to the present invention.

FIG. 1 shows a double-sided use four-way pallet of a mating type pallet, and FIG. 2 shows a double-sided use two-way pallet. FIG. 3 shows the one-sided use four-way pallet viewed from the back side, and FIG. 4 shows the one-sided two-way use pallet viewed from the back side.

FIG. 5 is a plan view showing a lower mold cavity block on one side of a double-sided four-way pallet having a minimum size, and FIG. 6 is a sectional view taken along line XX of FIG. 7A and 7B show a fork insertion leg leg-forming cavity block when the four-way insertion is two-way insertion. FIG. 7A is a plan view thereof, and FIG. 7B is a sectional view thereof. FIG. 8 shows a cavity block at the bottom of a ship for a lower die in a lower plate cavity block of a pallet for single-sided use, (a) is a plan view thereof, and (b) is a side view thereof. 9A and 9B show a convex cavity block for an upper mold in a lower plate cavity block of a single-sided pallet, in which FIG. 9A is a bottom view thereof, and FIG. 9B is a side view thereof. 10A and 10B show the shape of the lower plate cavity block of the pallet for single-sided use, FIG. 10A is a sectional view thereof, and FIG. 10B shows the positional relationship between the legs and the lower plate of the pallet for single-sided use. . FIG. 11 shows the lower mold cavity block for molding the insertion port,
(A) is the top view, (b) is the sectional view.

FIG. 12 is a plan view showing an assembled state of the pressure receiving plate and the ejector plate of the lower mold of the lower mold base part without the cavity group, and FIG. 13 is a front view showing a partial cross section of FIG. FIG. 14 is a right side view showing a partial cross section of FIG.

First, a metal mold for molding one side of a four-way insertion pallet using both sides of a matching type pallet is prepared. The lower mold cavity is divided into cavity blocks A, B, C and D shown in FIGS. Here, A is a leg cavity block (hereinafter referred to as a block), which has nine corner legs and four intermediate legs and one central leg, and these blocks A require a lot of man-hours for die processing. ,
It becomes expensive. Therefore, assuming the minimum size of the required pallet, design and process the minimum size A block,
The block A is quartered, and corner portions one plant and A ₁ that of the arc-shaped, and two types of A ₂ as having a beveled slope of the claw insertion of a forklift or the like. This, even when molding the pallet of any size, always so that the A block of the minimum size in common use, A _1
2 and A ₂ are combined as shown in FIG. And
The large-sized blocks can be manufactured at low cost by interposing a spacer block (not shown) made of a mere square bar with a small number of processing steps between them.

Here, the four corner legs are arcuate.
A₁With a circular arc part and a gradient A ₂Alternating with the gradient part of
On the outside (that is, diagonal positions of each other). Well
Also, the four middle legs have a slope A₂Between the gradient parts
Two arranged outside, arcuate shape A₁Between arc parts
Place two on the outside and then add two each to the gradient section.
And the arc portion is arranged on the opposite side. Furthermore, one
One central leg has four arcs A₁The arc part is all outside
It is arranged so that it is on the side.

Each of the blocks B and C has a fork insertion hole cavity as shown in FIG.
The B and C blocks are all the same height as the A block. And, it has a height capable of processing at least the cavity forming the leg portion of the A block, and the height dimension including the bases B ₁ and C _{1 under the} B and C blocks is divided into two or three, The total height is the same as that of the A block.

The block D is a cavity block having a standardized fork insertion width on four sides, and constitutes a placing surface in the case of upper and lower plates using both sides of the pallet and an upper plate using one side. Further, as will be described later, in the case of a lower plate used on one side, the entire block D is a hole cavity forming a hole.

The lower mold cavity of the double-sided four-way insertion pallet can be constructed by fixing the block groups 9 of A to D so as to surround the four sides by the vertical outer frame 7 and the horizontal outer frame 10 described later.

The upper mold (not shown) is also constructed by the same dividing method as the lower mold block, and the upper mold is the upper mold cavity block having the size of the lower mold block group. It may be fixed (not shown).

The block group 9 of these A to D comprises a pressure receiving plate 1, an ejector pin 20, an ejector plate 2, a lower die mounting plate 3, support pillars 4, 41, 42, a cooling water circuit, etc. Used as a mold for molding one side of a 4-way pallet. A two-sided use four-way pallet α can be molded by aligning the end faces of two legs on one side of the pallet molded by this mold and bolting or welding.

In order to use this mold for double-sided four-way pallet one-sided molding as a two-sided two-way pallet single-sided molding, six C blocks in the lower mold cavity of FIG. The upper part except the table C ₁ is replaced with the block having the structure shown in FIGS. 7 (a) and 7 (b). The block of FIG. 7 is a leg block cavity block for the fork insertion port. Then, the end faces of the two legs of the pallet formed on one side of the two-sided use two-way pallet that has been rearranged are combined and joined in the same manner as described above to form the two-sided use two-way pallet β.

Next, in order to mold the two-sided use two-way entry pallet with mold-sided use two-way entry pallet under single-sided molding, B block six base B ₁ of the lower mold cavity of Figure 5 The upper part except for is replaced with a block having the structure shown in FIGS. 8A and 8B and the concave surface of this block is upward. Then, the convex portions shown in FIGS. 9 (a) and 9 (b) are installed downward at six places of the upper die block facing the rearranged portion and assembled into the upper die mounting plate. These blocks of FIGS. 8 and 9 are lower plate cavity blocks of a single-sided pallet. By doing so, a mold structure can be formed which can mold the lower plate structure of the one-sided two-way insertion pallet. By aligning the leg end surface of one side of the lower plate part of the pallet molded with this mold and the end face of the leg part molded with the mold for molding the one side of the upper plate part of the two-sided use pallet, and tightening or welding A single-sided two-way insertion pallet δ can be molded.

Further, in order to use the mold for molding the lower plate portion of the two-sided pallet for one-sided use as a mold for molding the lower plate portion of the four-sided pallet for single-sided use, the C block 6 in the lower mold cavity of FIG. The points are rearranged into the blocks shown in FIGS. Then, the convex mold portions of the blocks shown in FIGS. 9A and 9B are installed downward in the upper mold facing the C blocks at the six places of the lower mold, and assembled into the upper mold mounting plate.
By doing so, a mold structure can be formed which can mold the lower plate structure of the one-sided use four-way insertion pallet. By aligning the leg end surface of the pallet lower plate part of the one-sided use four-way pallet molded by this mold with the end face formed by the two-sided use four-sided one-sided molding die, by bolting or welding A single-sided four-way insertion pallet γ can be molded.

In the case of molding the lower plate structure of the one-sided two-sided and four-sided pallet, the four sides of the hole cavity block D at four locations are prepared by cutting the upper and lower molds. In addition, square holes are formed in the four formed D portions. And, when loading a pallet using a hand lift, this hole is a wheel mounted on the tip of the claw of a trolley made in the shape of a hand lift.
The pallet is inserted into any one of the two holes sandwiching the central leg so that the pallet can be easily transported.

As shown in FIG. 13, the pressure receiving plate 1 is divided into three parts and has a structure in which both sides can be opened and closed left and right with respect to the central part. Here, the lower half of the left and right ends of the central plate divided into three parts is cut out, and the upper half of the right end and the left end of the left and right plates are cut out. Then, the left and right ends of the central plate are superposed on the right and left ends of the left and right plates, respectively, in a sliding manner.

The lower die mounting plate 3 has the same structure as that of the pressure receiving plate 1. Here, the upper half of the left and right ends of the central plate is cut out, and the right and left ends of the left and right plates are respectively cut. Cut out the lower half. Then, on the left and right ends of the central plate, the right end and the left end of the left and right end plates are overlapped so as to slide and move,
The pressure receiving plate 1 is turned upside down.

As shown in FIGS. 12 to 14, the ejector plate 2 is laterally divided into three parts, and a guide rod or the like (not shown) is provided between the pressure receiving plate 1 and the lower die mounting plate 3. A plurality of support pillars 4 are provided so that they can be moved up and down. Then, the plurality of shafts 8 are laterally fitted to the three-divided ejector plate 2, and the respective ejector plates 2 are integrated, so that the pressure receiving plate 1 and the lower die mounting plate 3 can be expanded and contracted in the lateral direction. The distance between the divided ejector plates 2 is increased or decreased. Set screw 8
Reference numerals 1 and 81 are provided on both sides of the central ejector plate 2 so as to prevent the shafts 8 from coming off.

A large number of T-slots 5 machined along the entire length in the vertical direction of each ejector plate 2 guide the head 201 of the ejector pin 20 therein, and the pin 2 in which the head 201 is inserted into the T-slot 5.
The tip of 0 is projected on the upper surface of the pressure receiving plate 1 through a large number of elongated holes 6 formed in the vertical direction of the pressure receiving plate 1. Then, the ejector pins 20 are made to project from the through holes (not shown) provided in the block groups 9 of A to D placed on the pressure receiving plate 1 by the rise of each ejector plate 2, so that the block group 9 is formed. The one-sided pallet molded by is projected from the lower mold.

A large number of support pillars 4 (shown as rectangles with a cross mark in FIGS. 12 to 14) are arranged in parallel in the central portion between the pressure receiving plate 1 and the lower mold mounting plate 3, and the support pillars 4 are provided. The pressure receiving plate 1 and the lower die mounting plate 3 are fixed to the upper and lower ends with bolts 43. In addition, the support pillar 41 (see FIG. 12)
(Displayed as a rectangle with an X in FIG. 14) is the pressure plate 1
And the lower die mounting plate 3 are provided at both ends in the vertical direction, and the support pillar 41 is vertically penetrated to fix the pressure receiving plate 1 and the lower die mounting plate 3 with bolts 44. Further, the support pillars 42 (shown as rectangles with X marks in FIGS. 12 to 14) are provided at both lateral ends of the pressure receiving plate 1 and the lower die mounting plate 3. Then, the upper ends of the support pillars 42 are fixed to the upper surface of the pressure receiving plate 1 with bolts 45 via the later-described vertical outer frames 7 installed at both ends in the horizontal direction. Further, the lower end of the support pillar 42 is fixed to the upper surfaces of both ends of the lower die mounting plate 3 in the lateral direction with bolts 46.

The vertical outer frame 7 has such a length that the maximum vertical dimension of the lower mold cavity of the pallet to be molded can be accommodated, and is placed on both ends of the pressure receiving plate 1 in the horizontal direction, as described above. It is fixed to the upper ends of the support pillars 42 and 42 together with the bolts 1 and 4.

The lateral outer frame 10 is divided into two halves in a stepped shape (zigzag), and the lateral outer frame spacer 22 whose both ends are steppedly shaped is fixed to the stepped cut portion with bolts 101, 101 to form the shape. It is designed to withstand the flow pressure of the resin at that time and to easily connect the cooling water circuit.

For example, the minimum width dimension of the pallet is 1,00
When the width is 0 mm, the lateral outer frame 10 having the minimum width dimension is equally divided into 500 mm, and the maximum width between them is 1,300 mm.
100, 200, 300 mm to increase in 100 mm increments
The horizontal outer frame spacer 22 can be rearranged.

The horizontal outer frame spacer 22 is interposed between the stepwise cut portions of the horizontal outer frame 10 to expand or contract the horizontal width of the horizontal outer frame 10 in accordance with the horizontal width of the pallet to be molded. In accordance with this, the pressure receiving plate 1 and the lower die mounting plate 3 are laterally expanded and contracted.

The lateral outer frames 10 and 10 are attached to the pressure receiving plate 1.
The outer frames 10 and 10 are placed on both upper ends in the vertical direction, and both ends of the outer frames 10, 10 are brought into contact with the surfaces of the outer frames 7, 7 which face each other. Then, the outer frames 7 and 7 are fixed to the elongated holes 21 and 21 extending in the left and right direction of FIG. In addition to the elongated holes 21 and 21, a large number of holes may be drilled and placed to accommodate the change in the vertical dimension of the pallet. At this time, the length of the long holes 21 or the length of the outer frame 7 for processing a large number of holes is set to the center of the outer frame 7 in the vertical direction on the assumption of the minimum vertical dimension of the pallet.
The horizontal outer frame 10 can be adjusted so that the horizontal outer frame 10 can be moved from the half position in the vertical direction to the half position in the maximum size.

By doing so, the horizontal outer frames 10, 1 are formed in the elongated holes 21, 21 of the vertical outer frames 7, 7 or in a large number of holes.
By moving the bolts 11, 11 at both ends of 0, the vertical dimension of the pallet to be molded can be adjusted.

Further, the bolts 23 are the outer frames 10 and 10 in the lateral direction.
Is fixed on the pressure receiving plate 1.
Then, the position of the bolt 23 and the position of the elongated hole 6 provided in the pressure receiving plate 1 are not shown to be the same. However, since a large number of elongated holes 6 are provided so as to come into contact with the T-grooves 5 of the ejector plate 2, the elongated holes 6 are formed so as to coincide with the positions of the bolts 23, though not shown. Then, a T-slot nut is inserted into the elongated hole 6 from below and fixed with bolts (both not shown) from above the lateral outer frame 10. Further, the elongated hole 6 can be similarly used when fixing the block group 9 of A to D on the pressure receiving plate 1.

Of the lateral dividing lines 12, 13, 14, 15 of the cavity block shown in FIG. 6, when increasing the lateral width direction of the pallet, a spacer block (not shown) similar to the previous term is provided on the dividing lines 12, 13 portion. ), The required size can be met. Further, among the vertical dividing lines 16, 17, 18, 19 of the cavity block shown in FIG.
Spacer block (not shown) similar to the previous term in the division part of
The required dimensions can be met by inserting.

[0059]

EFFECTS OF THE INVENTION In block group 9 of blocks A to D, a metal mold for molding one side of a four-sided pallet using a double sided pallet as a base is prepared. Then, the B, C, and D blocks of the upper or lower mold of the mold are appropriately replaced with the leg-forming cavity block for the fork insertion port of FIG. 7, the lower plate cavity block of the pallet for single-sided use of FIGS. 8 and 9. . And, a mold structure that can easily form four types of pallets, that is, a two-sided four-way pallet α, a two-sided pallet β, a one-sided four-way pallet γ, and a two-sided pallet δ. You can In addition, the horizontal dividing lines 12 and 13 and the vertical dividing line 1 of the block group 9
By inserting spacer blocks into 6, 18, and 19, it is possible to handle pallets of the required size, and it is possible to produce a large variety of small sized pallets of various sizes with various shapes with one set of dies.

Therefore, by using the mold structure of the present invention, conversion from a wooden pallet to a resin pallet can be performed.
It is made possible by capital investment for a set of molds, and the effect of contributing to this kind of industry is epoch-making.

Further, by utilizing the mold structure of the present invention, it is possible to use a plastic recycling material (industrial waste) for a large member such as a pallet, which can contribute to the progress of recycling of industrial waste. .

[Brief description of drawings]

FIG. 1 is a perspective view of a mating type double-sided four-way pallet.

FIG. 2 is a perspective view of a mating type double-sided two-way insertion pallet.

FIG. 3 is a perspective view of a mating type single-sided four-way insertion pallet viewed from the back side.

FIG. 4 is a perspective view of the double-sided pallet for use with a single-sided mating type as viewed from the back side.

FIG. 5 is a plan view showing a lower mold cavity block of a double-sided four-way insertion pallet having a minimum size.

6 is a cross-sectional view taken along line XX of FIG.

7A and 7B are views showing a leg-forming cavity block for a fork insertion port, in which FIG. 7A is a plan view thereof and FIG. 7B is a sectional view thereof.

8A and 8B show a cavity block at the bottom of a ship for a lower mold in a lower plate cavity block of a single-sided pallet, in which FIG. 8A is its plan view and FIG. 8B is its side view.

FIG. 9 shows a convex cavity block for an upper mold in a lower plate cavity block of a single-sided pallet, (a) is a bottom view thereof, and (b) is a side view thereof.

FIG. 10 is a sectional view showing the shape of the lower plate cavity block of a pallet for single-sided use.
(B) is sectional drawing which shows the positional relationship of a leg and the lower plate of a single-sided use pallet.

11A and 11B show a lower mold cavity block for forming an insertion port, in which FIG. 11A is a plan view thereof and FIG. 11B is a sectional view thereof.

FIG. 12 is a plan view showing an assembled state of vertical and horizontal outer frames, a pressure receiving plate, an ejector plate, and a support pillar of a lower mold of a lower mold base portion in which a cavity group is omitted.

FIG. 13 is a front view showing a partial cross section of FIG.

FIG. 14 is a right side view showing a partial cross section of FIG.

[Explanation of symbols]

 1 Pressure receiving plate 2 Ejector plate 3 Lower mold mounting plate 4,41,42 Support pillar 43,44,45,46 Bolt 5 T groove 6 Long hole 7 Vertical outer frame 8 Shaft 81 Set screw 9 Cavity block group 10 Lateral direction Outer frame 101 Bolt 11 Bolt 12,13,14,15 Lateral dividing line 16,17,18,19 Vertical dividing line 20 Ejector pin 201 Head 21 Long hole 22 Horizontal outer frame spacer 23 Bolt α Double-sided four-way pallet β Double-sided 2-way pallet γ Single-sided 4-way pallet δ Single-sided 2-way pallet

Claims (3)

[Claims] 1. A standardized fork in which a corner leg, an intermediate leg, and a central leg cavity in a pallet having an expected minimum size are divided to form a block, and a fork insertion cavity is equal to one side of each divided leg. A cavity block having an insertion width is combined to form a fork insertion cavity block, and these leg cavity block, fork insertion cavity block, fork insertion leg-forming cavity block, and cavity block having the fork insertion width on four sides are appropriately combined. , The combined cavity block group is placed in the vertical and horizontal outer frame to form a lower mold, the upper mold corresponding to this lower mold is combined in the same way as the lower mold, and the forklift pawls of the resin pallet are four-sided. Insert, two-way insert, and resin pallets A variable mold structure for a resin pallet for compression molding, which is capable of molding four types of pallets, one for double-sided use and one for single-sided use. 2. A corner leg, an intermediate leg, and a center leg cavity of a pallet having a minimum required size are divided to form a block, and a fork slot cavity is equal to one side of each leg divided, and a standardized fork is provided. Cavity block with insertion width is combined to form a fork insertion cavity block, and a spacer block is interposed between these leg cavity block, fork insertion cavity block, and fork insertion leg structure cavity block, and these cavity blocks are standardized. Corresponding to this lower mold, cavity blocks with four sides with fork insertion width are combined appropriately, and these combined cavity block groups are placed in an outer frame with variable vertical and horizontal dimensions to form a lower mold. Upper mold down Combined in the same manner as the mold, the forklift claws of the resin pallet can be used to form four-way insertion, two-way insertion, and four types of pallets of both types using both sides and one side of the resin pallet, and the dimensions of the resin pallet. The shape and size of the resin pallet for compression molding is variable. 3. A plurality of support pillars are provided between the central portion and the side surface portion of the pressure receiving plate and the lower die mounting plate which are divided into three parts and can be expanded and contracted, and the pressure receiving plate and the lower die mounting plate are provided. These support pillars were fixed vertically, and on the both sides of the upper surface of this pressure receiving plate, a vertical outer frame that can form up to the maximum size of the pallet was formed, and the length could be expanded and contracted between these vertical outer frames. A lateral outer frame is provided, and the vertical outer frame and the lateral outer frame fix the cavity block group,
Inserting the support pillar in the central part, providing a three-divided ejector plate that moves up and down between the pressure receiving plate and the lower die mounting plate, and inserting and ejecting these ejector plates with a plurality of shafts so that they can expand and contract. The form and dimension variable mold structure of a resin pallet for compression molding according to claim 2, wherein a plurality of ejector pins are provided on the plate so as to penetrate the pressure receiving plate and the cavity block group.