JPH0361566B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a first type of molded body that is molded to include a rectangular disk surface portion in plan view and leg portions that protrude toward the back side of this disk surface portion; A second type of molded body is molded having a rectangular disk surface portion, a leg portion protruding toward the back side of the disk surface portion, and an opening in the disk surface portion, and both types of molding are performed. The present invention relates to a method of manufacturing synthetic resin pallets whose bodies are welded and integrated.

The above-mentioned synthetic resin pallet is generally manufactured by fixing and integrating the above-mentioned two types of molded bodies in an inverted position.

By the way, as an example of synthetic resin pallets used for cargo handling and transportation management of various articles and products, there is a single-sided pallet that is mainly used for transportation management using a hand lift. This pallet has a deck surface, a circumferential side wall having a fork insertion hole, and a bottom surface, and has a relatively large opening in the bottom surface to allow use of a hand lift.
Incidentally, the deck surface corresponds to the disk surface portion of the first type molded body, and the bottom surface corresponds to the disk surface portion of the second type molded body. Then, the peripheral side wall is formed by the leg portions of the first type molded body and the second type molded body.

In order to obtain the above-mentioned synthetic resin pallets, conventionally, each of the first type molded body and the second type molded body, that is, each constituent board for forming each pallet, is On the other hand, it has been common practice to mold (manufacture) using special metal fittings, but this requires high mold investment costs. Particularly in the case of general-purpose pallets, unless the number of molding requirements (the number of orders received by the manufacturer) is large enough, the mold investment will not be worth it, leading to increased depreciation burden and higher costs.

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention provides a method for manufacturing synthetic resin pallets that can realize the above-described two types of pallets at low cost with as little investment in molds as possible.

The method for producing synthetic resin pallets according to the present invention includes:
A first type molded body that is molded to include a rectangular board part in plan view and legs protruding toward the back side of this board part, and a board part that is rectangular in plan view and the back part of this board part. and a second type of molded body that is molded so as to have leg parts that protrude to the side and have an opening in the board surface part, and to integrate the two types of molded bodies by welding, The feature is that the block, which is moved by an actuator between a blocking position for blocking the inflow of molten resin into the area where the opening is formed and an open position for releasing the inflow, is connected to the mold for forming both types of molded bodies. In preparation for this, the first block is moved to the open position.
The second type of molded product is molded while the seed molded product is molded, and the second type of molded product is molded while the block is moved to the blocking position.The operation and effect thereof are as follows.

That is, a block that is always provided on the molding die side is moved by an actuator to a blocking position that blocks the inflow of molten resin, and a second type of molded body having an opening in the plate surface is formed. This is intended to mold a first type molded body having no opening in the board surface by moving it to an open position where the inflow is released.

Therefore, since a common mold can be used regardless of the shapes and differences between the above-mentioned two types of molded bodies, the mold investment amount can be reduced as much as possible. Moreover, since the block can be moved arbitrarily between the open position and the closed position using the actuator, there is no need for troublesome work such as changing the block to a different position with the mold open. In addition, the actuator can quickly and easily adjust the movement of the block in accordance with the type of molded object to be molded, thereby improving work efficiency.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.The resin pallet 1 shown in FIG. 2 and the resin pallet 2 shown in FIG. 3 have deck surfaces 1A, 2A,
As clearly shown in Fig. 1, it is equipped with circumferential walls 1B, 2B having fork insertion ports 1F, 2F from four directions, and bottom surfaces 1C, 2C, and the length x width of each deck surface 1A, 2A. As shown in FIG. 4 A and B and FIG. 5 A and B, which have the same dimensions and are compared with each other in FIG. 4 A and B and FIG. As such, the bottom surface 2C of the latter pallet 2 is provided with an opening 1D for hand lift transfer which is so large that it does not exist. Palette 1 of such a set of two types,
2, the bottom opening 1D of the one pallet 1 and the corresponding bottom part 2D of the other pallet 2
The bottom surface parts 1C and 2C excluding the above-mentioned deck surface 1
A, 2A and the shape pattern of the peripheral side walls 1B, 2B [specifically, vertical and horizontal resin parts 6 into which reinforcing materials 5 such as steel pipes are inserted, divided by these resin girder parts 6, and the blank part has an X shape in plan view The reinforcing rib portion 7 is cross-linked in a shape, the number of anti-slip rubbers 8 for the placed article,
Size, arrangement, number, size, arrangement of anti-slip rubber 9 for forks inserted into a forklift or hand lift, size of fork insertion ports 1F and 2F,
shape] and dimensions are all the same. Figure 7 shows the former pallet 1 being hand lifted HL.
The figure shows the state in which it is moved by.

Then, in each of the pallets 1 and 2, the upper and lower two molded bodies are molded separately using the position bisecting the vertical length of the circumferential side walls 1B and 2B as a particle line, and the upper and lower two molded bodies are separately molded. By welding and integrating the front and back in an inverted position,
Each of the pallets 1 and 2 will now be constructed, and the method for molding the molded bodies constituting each of the pallets 1 and 2, which are synthetic resin pallets having a plate surface portion, will be described below.

By the way, deck surface 1A of pallet 1 is the first
The bottom surface 1C corresponds to the disk surface portion 1A of the seed molded body, and the bottom surface 1C corresponds to the disk surface portion of the second type molded body. Also, paleto 1
The bottom opening 1D corresponds to the opening 1D of the second type molded body.

The peripheral side wall 1B is formed by the leg portion 1b of the first type of molded body and the leg portion 1b' of the second type of molded body.

In other words, Figure 6 is a conceptual drawing of the entire molding die.
10 is a fixed mold, 3 is a movable mold, and the back side of this movable mold 3 is provided with a mounting plate 12 for a pin 11 that holds the reinforcing material 5 during molding, and a hydraulic cylinder 13 for operating the same. ing. Reference numeral 4 denotes a block arranged in an annular shape around the opening of the plate surface portion 1C of the second molded body which is the molded body on the bottom side of the one pallet 1, that is, the bottom opening 1D; The block 4 is fixedly supported by a mounting plate 15 with a hydraulic cylinder 14 disposed on the back side of the block 4, and the block 4 is then moved protrudingly toward the fixed mold 10 as shown by the solid line in FIG. 6 via the hydraulic cylinder 14 to prevent the inflow of molten resin. By moving it to the blocking position, it blocks the flow of molten resin into the portion corresponding to the opening 1C, or it separates from the fixed mold 10 and exits to the movable mold 3 side as shown in the imaginary line in FIG. By moving the molten resin to the open position where the inflow of the molten resin is released, it is possible to select whether to open the inflow of the molten resin to the portion corresponding to the opening, and to create a cross-sectional configuration as shown in Fig. 6 A or B. Two molded bodies, upper and lower, are formed to form a pallet 1 or 2 having a bottom surface 1C or 2C.

The block 4 may have an annular shape along the circumference of the opening 1D, or may have a size corresponding to the opening 1D.

The above explanation is based on two types of palettes 1 and 2.
The only difference in terms of shape and size is that one pallet 1 has an opening 1D on the bottom surface 1C, and the other pallet 2 has no such opening on the bottom surface 2C. The explanation is that the shapes and dimensions of the pallets 1 and 2 are all the same, so both pallets 1 and 2 have the same shape and size as the deck surfaces 1A and 2, respectively.
2A, peripheral walls 1B, 2B, and bottom surfaces 1C, 2C
Even if the molded parts are injection molded as a series including the above, the upper and lower parts of each pallet 1 and 2 can be formed into two upper and lower molded bodies by using the position bisecting the vertical length of the circumferential side walls 1B and 2B as a particle line. The component boards 01, 01', 02, 02' are molded separately, and the upper and lower two component walls 01, 01', 02,
02' may be welded and integrated in an inverted position, but in the three different embodiments listed below, each pallet 1 and 2 are made up of two upper and lower constituent boards 01. , 01', 02, and 02' are integrated by welding in an inverted position, but in each case, there is no difference in the shape or pattern of the component 1D, which is the essence of the invention. This includes that most of the components have the same shape and size.

That is, the correlation of shapes and dimensions for each of the two constituent panels 01, 01' and 02, 02' of the two pallets 1 and 2 shown in FIGS. The equation can be expressed simply using the symbol (=) and the inequality symbol (≠) as follows.

Figure 8 Cases a and b (01) = (02) = (02') ≠ 01' Figure 9 Cases a and b (01) ≠ (01') = (02) = (02') 10th In the case of Figures A and B, (01') = (02'), (01)≠(02) (01) + (01')≠ (02) + (02'), and the one in Figure 8 is There is a different component 1D on the bottom surface 1C of one pallet 1, and the component 2D' present on the deck surface 1A of one pallet 1 in FIG. There is a component 1D, and in the one shown in FIG. 10, the decking surface 1A of one pallet 1 has a configuration different from the shape pattern of the decking surface 2A of the other pallet 2, specifically, the shape of the reinforcing rib portion. , the entire deck surface 1A becomes the component 1D.

[Brief explanation of drawings]

Figure 1 is a front view of the pallet, Figures 2 and 3 are partially cutaway plan views of separate pallets, Figure 4
Figure 5A is an enlarged bottom view of the main parts in separate palettes, Figures 4B and 5B are the Roll-Ro line in Figure 4, and Figure 5
Figure 6 is a conceptual diagram of the molding die, Figure 7 is a partially vertical side view showing how it is being handled by hand lift, Figure 8 A, B to Figure 10 I. , B are schematic vertical sectional views of two pallets showing different embodiments, respectively. 1A, 1C...board surface part, 1b, 1b'...leg part,
1D...opening, 3...molding mold, 4...block, 14...actuator.

Claims (1)

[Scope of Claims] 1. A first molded body formed to include a board surface portion 1A having a rectangular shape in a plan view and a leg portion 1b protruding toward the back side of the board surface portion 1A; and a leg portion 1b' projecting toward the back side of the board surface portion 1C, and the board surface portion 1C
A method for producing a synthetic resin pallet, comprising molding a second type of molded body molded so as to have an opening 1D at a location where the opening 1D is formed, and welding and integrating both types of molded bodies. The block 4 is moved by the actuator 14 between a blocking position where the inflow of molten resin is blocked and an open position where the inflow is released.
is provided in the molding die 3 for both types of molded bodies, and the first type of molded body is molded with the block 4 moved to the open position, and the block 4 is moved to the cut-off position. A method for manufacturing a synthetic resin pallet, comprising molding the second type of molded body while moving the pallet.