JPH11314640A - Aluminum pallet for transportation in roller conveyor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an aluminum pallet excellent for roller conveyor transportation without impairing merits such as light-weight, strength, and transportability of the aluminum pallet. SOLUTION: Respective upper face deck boards 3 and lower face deck boards 4 of this aluminum pallet 1a are constituted of girder members 2, deck boards 6, 8, and edge boards 5, 7. Hollow overhang parts 9, 9 having a nearly rectangular section are oppositely provided at the side of respective bottom of the girder members 2 forming both side parts, and fitting seats 9 are provided at the oppositely arranged ends of these overhang parts 9, 9, and the deck board 6 and both ends 7a, 7b of the edge board 7 are brought into contact with the inside of fitting seat 9 and fixed thereto to weld the contact face. The bottom face 7c of the deck board 8 and the edge board 7 is formed to be flush with the bottom face 92c of the girder member 2 and the bottom face 9c of the overhang part 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an aluminum pallet, and more particularly to an aluminum pallet suitable for transportation by a roller conveyor.

[0002]

2. Description of the Related Art As is well known, in place of conventional pallets made of wood, resin, iron, etc., aluminum alloy pallets using JIS 6000 or other aluminum alloy molds, plates, bars, etc. Aluminum pallets)
Is widely used for transporting, storing, or transporting articles in distribution or distribution.

[0003] These aluminum pallets have a wide variety of structures due to the variety of uses, requirements and specifications of the pallets. However, basically, aluminum decks are arranged on an aluminum deck board. Arranged to form an upper deck, and if necessary, an aluminum deck board is arranged below the girders to form a lower deck, and the contact parts between these members are welded or fastened with bolts and nuts etc. The whole structure is box-shaped. Among these aluminum pallets, for example, aluminum pallets having a box-shaped structure formed by combining extruded aluminum hollow mold members having a rectangular cross section (hereinafter simply referred to as a rectangle) and joining them by welding are manufactured. It is advantageous in terms of process, manufacturing cost, and weight reduction, and is becoming mainstream among aluminum pallets.

As a typical example of an aluminum pallet using this hollow aluminum material, as shown in FIG. 6 (a), an aluminum pallet 1f is formed from an aluminum hollow material 23 having a rectangular cross section (hereinafter simply referred to as a rectangle). The beam members 20 are arranged in rows at predetermined intervals, and a rectangular aluminum hollow member (deck board) 24 is also arranged orthogonal to the beam members 20 to form an upper deck 21. A deck board) 25 is disposed orthogonally to the beam 20 to form a lower deck 22, and a contact portion (corner) between the aluminum hollow members 23, 24, 25 is welded and assembled into a skid type. It has a basic structure.

As another mode, as shown in FIG. 6 (b), a type such as an aluminum pallet 1g having no lower deck 22 and only an upper deck 21 is often used.

As shown in FIGS. 6 (a) and 6 (b),
Pallets assembled by welding rectangular aluminum hollow members are lighter in weight than wooden pallets made of resin, iron, or other solid materials or aluminum pallets assembled with fasteners. Superior to wooden and resin pallets in that there is no danger of fire,
It is more durable and does not crack, debris, or rust, and is superior to wooden, resin, and iron pallets.It is not charged like a resin pallet and does not attract dust. (Recycling) is possible. In addition to the corrosion resistance of the base aluminum alloy itself, it has the advantage that it is superior to cleaning pallets and disinfectants, and is superior to wooden and resin pallets.

In addition, the aluminum pallet has a complicated shape and structure that is resistant to a cleaning solution and a disinfectant, and has irregularities, protrusions, or liquid pools on the surface or in the space, in combination with the corrosion resistance of the aluminum alloy itself as a base material. It has a relatively simple and smooth surface and a welded structure, and has the advantage that the entire pallet can be washed uniformly and used repeatedly. Therefore, it is particularly suitable for fields requiring sanitary control, such as the pharmaceutical, food or cosmetic industries. Therefore, aluminum pallets have recently been widely used in various fields such as warehouses for storing articles such as raw materials, materials and products.

In particular, an aluminum pallet made of an aluminum hollow material as shown in FIGS. 6 (a) and 6 (b) has a plate thickness for weight reduction.
The thickness is 4 mm or less, and even such a thin wall satisfies the strength standard of JIS Z0605, which is the standard for metal flat pallets. More specifically, the compressive strength of the pallet is 2 mm or less in strain, and the bending strength is 1% in flexure.
Hereinafter, it has a characteristic of a residual deflection rate of 0.3% or less.

[0009]

Generally, in a warehouse for storing articles, it is necessary to transport the aluminum pallet itself loaded with the load (the load article) by a roller conveyor. For example, in the case of a conveyor or cargo handling work in a factory or warehouse, or in a factory or warehouse, or when transporting, storing, or transporting articles, the aluminum pallet shown in FIGS. 6A and 6B is used. , Transported on a roller conveyor.

However, the aluminum pallet 1g made of aluminum hollow mold as shown in FIG. 6 (b) is not provided with a lower deck board. Therefore, when this pallet is transported by a roller conveyor, the legs are not connected to each other. The rollers of the roller conveyor are stuck in between, and cannot be slid or moved smoothly on the roller conveyor. For this reason, there is a problem that it takes a long time for positioning when loading on the roller conveyor and unloading from the roller conveyor, and it is not possible to expect an improvement in the transport work efficiency.
Furthermore, there is a problem that the usability is poor because the roller can be stacked on the roller conveyor only in a certain direction.

An aluminum pallet 1f made of an aluminum hollow material as shown in FIG. 6 (a) is provided with a lower deck board, but the width of the aluminum beam itself is narrow. For this reason, when the aluminum pallet is transported in the direction b in FIG. 6 (a) by the roller conveyor, the longitudinal surface of the relatively wide bottom deck board becomes a contact surface with the roller conveyor,
Although the aluminum pallet can be transported smoothly in direction a in Fig. 6 (a), depending on the width of the aluminum pallet, the width of the aluminum deck is narrow. The contact surface with the conveyor.

In this case, the length (width) of the widthwise surface of the lower deck board is naturally shorter than the longitudinal direction.
For this reason, the lower deck board is not provided,
When the aluminum pallet 1g is conveyed by a roller conveyor in the direction a in Fig. 6 (a), the roller of the roller conveyor is placed between the lower deck boards. Will not fit, and will not slide or move smoothly on the roller conveyor, causing the same problem described above.

[0013] Further, when the roller pallet cannot be slid and moved on the roller conveyor, another problem arises in that the aluminum pallet portion in contact with the roller conveyor is worn. That is, for example, the aluminum pallet 1f shown in FIG.
Is transported by a roller conveyor, a portion of the lower deck board that contacts the roller conveyor along the longitudinal direction thereof is worn. Further, when the roller conveyor is transferred from one roller conveyor to another roller conveyor, if the roller conveyors are orthogonal to each other, the relative direction of the roller conveyor to the aluminum pallet changes by 90 °. For this reason, a portion of the lower deck board of the aluminum pallet that is in contact with the roller conveyor along the longitudinal direction thereof is also worn.

When this abrasion occurs, the durability and the service life of the aluminum pallet are reduced, and the abrasion powder is scattered around the conveyor including the conveyor. This means wooden, resin,
There is a problem in that the above-mentioned basic advantages of the aluminum pallet, which is superior to the pallets made of iron or the like (there is no generation of debris and rust, excellent durability, etc.), are lost.

In order to solve such a problem of abrasion, it is basically conceivable to increase the hardness of the portion of the aluminum pallet that comes into contact with the roller conveyor, thereby enhancing the abrasion resistance of the portion.

As a means for achieving this, it is conceivable to cover the surface of the lower deck board portion of the aluminum pallet in contact with the roller conveyor by spraying, shot or plating a material such as a metal having a higher hardness than aluminum. Can be However, the thickness of the aluminum hollow pallets that make up the aluminum pallet is 4 mm or less at most, and often 1
It is as thin as ~ 2mm. For this reason, there is a possibility that deformation may occur when heat treatment such as thermal spraying or shots or an impact is applied. Moreover, the treatment itself is expensive together with plating, painting, etc., and because of the excellent properties of aluminum itself such as corrosion resistance, it is not used for surface treatment and is used as inexpensive bare aluminum The result is a loss of the basic benefits of pallets.

There is also a method in which a wear-resistant plate is detachably provided with a screw or the like on a portion of the aluminum pallet that comes into contact with the roller conveyor. However, since the frictional force with the roller conveyor is large, the plate is damaged at the joint. It's easy to do. Also,
Also when joining with screws or rivets, the head of the rivet becomes higher than the surface of the lower deck board part of the aluminum pallet, and the head of this screw or rivet collides with the roller conveyor, conversely damaging the roller conveyor ~ aluminum pallet Transport is not performed smoothly and transportability is poor. Therefore, this method is also less feasible.

In particular, as described above, the aluminum pallet made of the hollow aluminum material as shown in FIGS. 6 (a) and 6 (b) is made as thin as 4 mm or less for the purpose of weight reduction. Therefore, the provision of the wear-resistant plate impairs the weight reduction of the aluminum pallet, and in this regard, the advantage of the aluminum pallet is lost and the commercial value is reduced.

Accordingly, an object of the present invention is to provide a roller pallet made of a rectangular hollow aluminum material by welding without impairing the advantages such as weight reduction, strength and transportability of the aluminum pallet. To provide aluminum pallets.

[0020]

In order to achieve this object,
The aluminum pallet for conveying the roller conveyor according to the present invention, an aluminum deck is arranged in a row, and an upper deck and a lower deck are formed by an aluminum deck board and an aluminum edge board which are arranged orthogonal to the deck. An aluminum pallet having a box-type structure assembled by welding the contact portions, and a protruding portion having a substantially rectangular cross section is opposed to the bottom side of each of the aluminum beams forming both sides of the pallet. A mounting seat is provided at opposite ends of these overhanging portions, and both ends of an aluminum deck board and an aluminum edge board constituting the lower deck are locked in the mounting seat to form a lower deck. The bottom surface of the aluminum deck board and the aluminum edge board to be made and the bottom surface of the aluminum girder are flush with each other, and by the bottom surface of the aluminum edge board and the aluminum girder, Over error conveyor (hereinafter simply referred to as conveyor) to increase the forming the contact surface with.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the aluminum pallet of the present invention will be described below with reference to FIGS. FIG. 1 is a perspective view showing an embodiment of the aluminum pallet of the present invention, and FIG.
Fig. 3 is a plan view of the aluminum pallet of Fig. 1 viewed from the bottom side.
4 and 5 are front views each showing another embodiment of the aluminum pallet of the present invention.

First, in FIGS. 1 and 2, the aluminum pallets 1a of the present invention are arranged in rows at intervals, and
(Two side surfaces), two girders 2 made of an aluminum hollow mold member, and deck boards 6, 8 and edge boards 5 made of an aluminum hollow mold member arranged orthogonal to the girders 2,
7, the upper deck 3 and the lower deck 4 are formed, respectively, and a hollow 11 made of a hollow aluminum material is arranged at the center of the pallet to support the upper deck 3 and the lower deck 4. And the whole has a box-shaped structure assembled by welding the contact portions of these members.
Since the upper deck board 6 and the edge board 5 are hollow members, the hollow portions at both ends of the hollow members are closed to prevent water or dust from entering.
Numeral 12 is provided selectively covering the hollow portions at both ends of the hollow mold. In addition, such an end plate is made of an aluminum girder 2 having a hollow portion at both ends and an overhang portion 9.
May be selectively provided in contact with both ends.

As a characteristic structure of the aluminum pallet of the present invention, first, each of the aluminum girders 2 forming both sides of the aluminum pallet 1a has a hollow shape having a substantially rectangular cross section on the side of the bottom. Overhang portions 9, 9 are provided to face each other. Next, a concave groove-shaped mounting seat 9 is provided at opposing ends (corners below the ends) of the overhanging portions 9, 9. Then, both ends (each end 7a, 7b of the edge board 7) of the deck board 8 and the edge board 7 constituting the lower deck 4 are abutted and locked in the mounting seat 9, and the abutting surface is formed. To the bottom of deck board 8 and edge board 7 (bottom 7c of edge board 7)
And the bottom surfaces 2c and 9c of the aluminum beam 2 and the overhanging portion 9 are flush with each other.

With such a configuration, the contact surface with the conveyor is formed by the bottom surface 7c of the edge board 7, the aluminum bar 2 and the bottom surfaces 2c and 9c of the overhang portion 9. Therefore, when the aluminum pallet is conveyed on the conveyor in the direction b in FIG. 2, the bottom surface 7c in the longitudinal direction of the edge board 7 of the relatively wide lower deck serves as a contact surface with the conveyor. Therefore, as indicated by X, the trajectory of the conveyor with respect to the bottom surface 7c in the longitudinal direction of the edge board 7, the aluminum pallet can be smoothly transported by the conveyor. Also figure
When the aluminum pallet is transported in the direction a, the bottom surface 2c, 9c of the aluminum girder 2 and / or the overhang 9 is
A contact surface with a wide conveyor. Therefore, the aluminum pallet can be smoothly or smoothly conveyed by the conveyor, as indicated by Y, the trajectory of the conveyor with respect to the bottom surfaces 2c, 9c of the aluminum girders 2 and / or the overhanging portions 9.

Therefore, when transported by a conveyor like the conventional aluminum pallet shown in FIG.
There is no problem that the rollers of the conveyor fit between the lower deck boards and cannot be slid or moved smoothly on the conveyor. Also, when the conveyors are orthogonal to each other, when the aluminum pallet is transferred from one conveyor to another, the relative direction of the conveyor to the aluminum pallet changes by 90 °, and the lower deck board of the aluminum pallet In addition, a smooth aluminum pallet can be transferred, moved or changed direction without abrasion occurring at a portion abutting on the conveyor along its longitudinal direction.

Further, due to the presence of the overhang portion 9, the rigidity of the aluminum pallet is significantly improved as compared with the conventional aluminum pallet as shown in FIG.
To b direction) is improved. This means that the workability of transport or stacking when placing a load on the pallet and suspending or loading the pallet with, for example, a crane or forklift, and transporting or stacking the conveyor on or off the conveyor is remarkable. It also has the effect of improving.

The rigidity and deflection resistance in the longitudinal direction of the pallet, particularly in the vertical direction, are such that the greater the thickness of the part of the aluminum girder 2 shown in FIG.
The second moment increases and increases. In this regard, in the present invention example, the thickness of the material of the material portion separated from the central horizontal axis Z is significantly larger than that of the conventional aluminum pallet as shown in FIG. Because it will increase
The rigidity and deflection resistance in the longitudinal direction of the pallet are improved.

Next, in another embodiment of the present invention shown in FIG. 3, the basic structure of the aluminum pallet 1b is the same as that of the aluminum pallet 1a of FIGS. 1 and 2, but supports the upper and lower decks. The only difference is that the hollow member 13 is not an aluminum hollow material as shown in FIGS. 1 and 2, but an I-beam shaped aluminum material. The use of this I-beam shaped aluminum mold requires less aluminum material than the aluminum hollow mold shown in Figs. 1 and 2, and the rigidity of the aluminum pallet is as shown in Figs. After securing the same level as above, further weight reduction is achieved.

As described above, the rigidity and deflection resistance in the longitudinal direction of the pallet, especially in the vertical direction, are determined by the material of the portion of the girder 13 which is an I-beam-shaped aluminum member shown in FIG. The larger the wall thickness, the larger and higher the second moment of area. Therefore, if the thickness of the T-shaped end of the I-beam-shaped aluminum member is made relatively thick, it is equivalent to the aluminum hollow member, and requires less aluminum material than the aluminum hollow member, thus reducing the weight. Along with achieving this, rigidity and bending resistance in the longitudinal direction of the pallet, particularly in the vertical direction, are ensured.

Furthermore, particularly when an aluminum beam having an I-beam shape is used, there is no enclosed space like a rectangular aluminum hollow member. As described above, there is no possibility that water or the like accumulates in the closed space, and there is an advantage of being sanitary.
Because of this, like the pharmaceutical, food or cosmetic industries,
It has the advantage of being particularly suitable for areas requiring hygiene management.

Further, in another embodiment of the present invention shown in FIG. 4, the basic structure of the aluminum pallet 1c and the
3 is similar to that of FIG. 3 except that the girder members 14 constituting both sides (both sides) of the pallet are not aluminum hollow members but solid aluminum members. The cross section on the bottom side of each of the members 14 has a substantially rectangular projecting portion 15 having a hollow shape, and the mounting seat 16 at the opposite end of the projecting portion 15 is formed by a solid aluminum projection or rib. The only difference is that they do. In the example of FIG. 4, the upper end portion 14a of the girder member 14 is formed in a T-shape, and the end portions of the deck board 6 and the edge board 5 constituting the upper deck are mounted thereon and supported. As described above, when the upper end of the girder 14 is formed in a T-shape, the upper end of the girder 14 and the ends (hollow part) of the deck board 6 and the edge board 5, as indicated by the dotted line α in FIG. It is possible to perform spot welding by sandwiching the above, and there is an advantage that the number of welding steps can be reduced and the cost can be reduced.

Further, in another embodiment of the present invention shown in FIG. 5, the basic structure of the aluminum pallet 1d and the
Is made of an I-beam shaped aluminum section, as shown in Figs. 3 and 4.
Same as above, except that the girder 17 constituting both sides (both sides) of the pallet is a solid aluminum material, and the overhanging portion 18 having a substantially rectangular cross section on the bottom side of each girder 17 It is a real aluminum shape material, and the mounting seat at the opposite end of the overhang portion 18
19 also differs only in that it is formed by solid aluminum protrusions or ribs. In the example of FIG.
17a is formed in an L-shape, and the ends of the deck board 6 and the edge board 5 constituting the upper deck are mounted on and supported thereon, respectively. In the case of the aluminum pallet 1d in Fig. 5, less aluminum material is required than in the case of using an aluminum hollow member as the beam, and the rigidity of the aluminum pallet is as high as that of the aluminum pallets in Figs. In addition, further weight reduction is achieved.

The aluminum pallet of the present invention has the above-described characteristic structure, and conveyability of the conveyor can be ensured without impairing the advantages of the aluminum pallet such as weight reduction, strength, and transportability. In addition, when the thickness of each aluminum member is reduced to 4 mm or less while keeping the weight reduced, FIG.
As with the short aluminum hollow material shown in (b),
It can satisfy JIS Z0605, which is the standard for flat metal pallets, especially the strength standard. More specifically, the compressive strength of the pallet can satisfy a strain amount of 2 mm or less, a bending strength of 1% or less in a deflection rate, and a residual deflection rate of 0.3% or less.

It is preferable that the width of each member constituting the aluminum pallet of the present invention or the number of used members be designed from the viewpoint of the strength standard of JIS Z0605 as long as the weight reduction is not hindered.

The material of the aluminum alloy used for the aluminum pallet of the present invention is a structural material or a welded structural material, which secures the assembling strength of the entire long aluminum pallet, and has a rigidity in the longitudinal direction of the aluminum pallet. And it is necessary to have excellent deflection resistance. Therefore, it is preferable that the Al alloy suitable for this has, as basic required properties, mechanical properties such as strength and proof stress, workability such as extrudability into a rectangular aluminum hollow mold material, weldability, and corrosion resistance. . Specifically, among Al alloys, JIS
JIS 6000 series such as 6061, 6N01, 6063, 6151, etc. are preferred, but JIS 5052, 5652, 5154, 5254, 5454, 5083, 5086,
JIS 5000 series such as 5456, JIS 7001, 7N01, 7003, 7050,
JIS 7000 series Al alloys such as 7072 and 7075 can be used as appropriate.

[0036]

As described above, according to the aluminum pallet of the present invention, it is possible to provide an aluminum pallet excellent for conveying a roller conveyor without impairing the advantages of the aluminum pallet such as weight reduction and strength. .

[Brief description of the drawings]

FIG. 1 is a perspective view of an aluminum pallet showing one embodiment of the present invention.

FIG. 2 is a plan view of the aluminum pallet of FIG. 1 as viewed from the bottom side.

FIG. 3 is a front view of an aluminum pallet showing one embodiment of the present invention.

FIG. 4 is a front view of an aluminum pallet showing one embodiment of the present invention.

FIG. 5 is a front view of an aluminum pallet showing one embodiment of the present invention.

FIG. 6 is a perspective view showing a conventional general aluminum pallet.

[Explanation of symbols]

1a ~ 1g… Aluminum pallet 2… Girder 3… Top deck 4… Bottom deck 5… Edge board 6… Deck board 7… Edge board 8… Deck board 9… Overhanging part 10… Mounting seat 11… Shelter 12… Cover 13… I beam 14… Girder 15… Overhang 16… Mounting seat 17… Girder 18… Overhang 19… Mounting seat X, Y… Conveyor locus a, b… Aluminum pallet transfer direction

Claims (10)

[Claims] An upper deck and a lower deck are constituted by arranging aluminum girders in a row, and an aluminum deck board and an aluminum edge board disposed orthogonally to the girders, and welding a contact portion between these members. An aluminum pallet having a box-type structure assembled by assembling, and protruding portions having a substantially rectangular cross section are provided on opposite sides of the bottom of each of the aluminum beams forming both sides of the pallet, and A mounting seat is provided at opposing ends of the protruding portion, and both ends of an aluminum deck board and an aluminum edge board constituting the lower deck are locked in the mounting seat, and an aluminum deck board constituting the lower deck is provided. The bottom surface of the aluminum edge board is flush with the bottom surface of the aluminum girder and the overhanging portion, and the roller is formed by the aluminum edge board and the bottom surface of the aluminum girder and the overhanging portion. -An aluminum pallet for conveying roller conveyors, characterized by having a contact surface with the conveyor. 2. The aluminum pallet for transporting a roller conveyor according to claim 1, wherein the aluminum deck board is a hollow aluminum material having a rectangular cross section. 3. The aluminum pallet for conveying a roller conveyor according to claim 1, wherein the aluminum beam is a hollow aluminum member having a rectangular cross section. 4. The method according to claim 1, wherein the hollow member of said aluminum member is I
The aluminum pallet for conveying a roller conveyor according to any one of claims 1 to 3, wherein the aluminum pallet is a beam-shaped aluminum material. 5. The aluminum pallet for conveying a roller conveyor according to claim 1, wherein the projecting portion has a hollow shape having a rectangular cross section. 6. The aluminum pallet for transporting a roller conveyor according to claim 1, wherein the thickness of each aluminum member is 4 mm or less. 7. The roller conveyor pallet according to claim 1, wherein each of the aluminum members is an extrusion member. 8. The aluminum pallet for conveying a roller conveyor according to claim 1, wherein each of the aluminum members is made of a JIS 6000 series aluminum alloy. 9. The method according to claim 1, wherein the aluminum pallet has a compressive strength of 2 mm or less in terms of strain, a flexural strength of 1% or less in deflection rate, and 0.3% or less in residual deflection rate. Aluminum pallets for roller conveyor transport. 10. The aluminum pallet for transporting a roller conveyor according to claim 1, wherein the aluminum edge board has a substantially trapezoidal cross section having an inclined surface.