Reinforced composite material integrally-formed air transportation container pallet and machining method thereof

Abstract

According to the reinforced composite material integrally-formed air transportation container pallet and the processing method thereof, based on the reinforced composite material, integral injection molding is adopted, the integral structure of the pallet is achieved, and the vacuum compounding procedure is avoided. The packaging tray comprises a tray body and a mooring ring installed on the tray body through a nut plate. The tray main body is of a plate-shaped structure which is integrally injection-molded by adopting a reinforced composite material; a plurality of sawteeth are uniformly distributed on four side edges of the tray main body after integral injection molding at intervals; a mooring ring mounting opening for mounting a mooring ring is reserved; a nut plate is mounted in the mooring ring mounting opening and is used for providing a connecting interface of the mooring ring; after the mooring rings are installed, secondary local injection molding filling is conducted on the mooring ring installation openings through reinforced composite materials.

Description

Technical Field

[0001] The invention relates to a transport container pallet, in particular to an aviation transport container pallet integrally formed of reinforced composite materials, and belongs to the technical field of mechanical devices and transport equipment. Background Art

[0002] Air transport container pallets include two categories: military and civilian. They were first proposed by the United States in the 1960s. The military field took the lead in using 463L pallets to realize air containerized transportation, giving full play to the advantages of large transport aircraft and ultra-long range, and achieving the strategic goal of global high-efficiency air delivery.

[0003] Air transport container pallets are one of the main forms of air container transport. At present, there are two main regulations: American and Russian standards. The United States and Russia (Soviet Union) customize the air transport container specifications and the interfaces of corresponding products respectively. Since the beginning of the 21st century, the interfaces and parameters of air transport container equipment suitable for our military have been designed with reference. Drawing on the regulatory standard container equipment of the two countries, my country began to develop and design air transport container pallets that meet the conditions for military use, and gradually began to put them into military use after 2010.

[0004] my country mainly draws on the U.S. military's 463L system to develop air transport container pallets, which adopts a composite structure of aluminum alloy + core material. At present, corresponding problems are gradually exposed, mainly including high requirements for the composite process and relatively complicated procedures; the core material cannot meet the corresponding flame retardant standards and achieve complete aviation grade flame retardancy; aluminum alloy materials are prone to corrosion in humid and coastal areas, which can easily cause "hollowing" problems.

[0005] In summary, the traditional air transport container pallets have the problems of difficult production process, high cost, and insufficient environmental adaptability and reliability. Summary of the invention

[0006] In view of this, the present invention provides an aviation transport container pallet integrally formed of reinforced composite materials, which is based on the reinforced composite materials and adopts integral injection molding to achieve the overall structure of the pallet and avoid the vacuum compounding process.

[0007] The technical solution of the present invention is: a reinforced composite integrally formed aviation transport container pallet, comprising: a pallet body and a tethering ring mounted on the pallet body through a nut plate;

[0008] The pallet body is a plate-shaped structure made of reinforced composite material and integrally injection-molded;

[0009] The four sides of the integrally-injected tray body are evenly spaced with a number of saw teeth; and a tether ring installation opening is reserved for installing a tether ring;

[0010] A nut plate is installed in the mounting opening of the mooring ring, and the nut plate is used to provide a connection interface for the mooring ring;

[0011] After the mooring rings are installed, the installation openings of the mooring rings are partially filled with reinforced composite materials for secondary local injection molding.

[0012] As a preferred embodiment of the present invention, the reinforced composite material is a polyetheretherketone composite material reinforced with 30% to 40% carbon fiber.

[0013] As a preferred embodiment of the present invention, the outer surface of the tray body has a reinforcement coating.

[0014] As a preferred embodiment of the present invention: the reinforced coating is a nano-reinforced coating.

[0015] As a preferred embodiment of the present invention: the ring retaining installation openings are located at the four corners of the pallet main body and between two adjacent saw teeth;

[0016] Based on this, the nut plate includes a strip nut plate and a right-angle nut plate; the strip nut plate is installed in the mooring ring mounting opening between two adjacent serrations, and the right-angle nut plates are installed in the mooring ring mounting openings at the four corners.

[0017] In addition, the present invention provides a method for processing a reinforced composite material integrally formed aviation transport container pallet:

[0018] First, the tray body is molded: a one-piece injection molding process is used to inject a hot-melt reinforced composite material with physical fluidity into the mold cavity used for molding; after cooling at a set pressure, the one-piece injection molding of the tray body is completed; after molding, the tray body is finely processed;

[0019] After finishing the pallet body, the nut plate and the mooring ring are installed. After the mooring ring is installed, the installation openings of each mooring ring are filled with secondary injection molding.

[0020] As a preferred embodiment of the present invention, after completing the secondary injection molding filling, the formed pallet is trimmed as a whole, and the surface of the pallet body is roughened to make it ready for spraying of the enhanced coating, and then the enhanced coating is sprayed and cured on the surface of the pallet.

[0021] As a preferred embodiment of the present invention, the method for forming a hot-melt reinforced composite material having physical fluidity is as follows:

[0022] The particles of raw materials used to reinforce composite materials are hot-melted, heated and pressurized to achieve hot-melt flow of the raw materials.

[0023] As a preferred embodiment of the present invention, during the secondary injection molding, the mounting openings of the mooring rings at different positions are simultaneously injection molded and filled, and the hot-melt reinforced composite material is pressure-injected during the secondary injection molding.

[0024] Beneficial effects:

[0025] (1) The reinforced composite one-piece aviation transport container pallet of the present invention adopts one-piece injection molding and secondary local injection molding and filling to achieve the overall structure of the pallet; abandoning the composite bonding and riveting process of traditional aviation transport container pallets can make the overall structure of the pallet body better, reduce the difficulty of the process, and realize repetitive injection molding production with a one-time mold opening.

[0026] (2) In the reinforced composite one-piece aviation transport container pallet of the present invention, the pallet body is a solid one-piece structure, eliminating the wooden core material as a filling load-bearing component, thereby solving the shortcomings of the traditional core material balsa wood that is easily affected by moisture and flammable.

[0027] (3) In the present invention, the reinforced composite material used for injection molding adopts 30% to 40% carbon fiber reinforced polyetheretherketone composite material. The reinforced composite material is compatible with the excellent performance of polyetheretherketone and integrates the high strength performance of carbon fiber; it has high rigidity, high modulus, super wear resistance and self-lubrication, and can be used for injection molding and extrusion molding. The material has good heat resistance and excellent flame retardant properties.

[0028] (4) In the present invention, the outer surface of the pallet body has a two-component reinforced coating, which, combined with the reinforced composite material, can achieve better anti-corrosion performance and greatly improve the service life in coastal and humid areas.

[0029] (5) The processing method of the present invention adopts one-piece molding technology, develops a mold once, realizes repeated injection molding, and achieves mass production, which can reduce costs by 20%; and can realize material recycling and reduce usage costs. After damage and life, the material can be evaluated and recycled. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the aviation transport container pallet after integral injection molding of the present invention (front view);

[0031] Figure 2 It is a partial detail diagram of the aviation transport container pallet after integral injection molding of the present invention;

[0032] Figure 3 It is a schematic diagram of the overall structure of the aviation transport container pallet after integral injection molding of the present invention (bottom);

[0033] Figure 4This is a detailed installation diagram of the tie-down ring of the aviation container pallet after one-piece injection molding;

[0034] Figure 5 It is a structural schematic diagram of a strip nut plate;

[0035] Figure 6 It is a structural schematic diagram of a right-angle nut plate;

[0036] Figure 7 A detailed view of a container pallet after secondary partial injection molding of the mounting opening of the tie-down ring.

[0037] Among them: 1-tray body, 2-serration, 3-tethering ring, 4-strip nut plate, 5-right angle nut plate, 6-tethering ring installation port. DETAILED DESCRIPTION

[0038] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0039] Embodiment 1:

[0040] The present embodiment provides an integrally formed aviation transport container pallet based on composite materials. The container pallet is based on reinforced composite materials and adopts integrally formed injection molding technology to achieve an integral structure and avoid a vacuum compounding process.

[0041] The composite-based one-piece aviation transport container pallet is a flat pallet in a pallet assembly using plate mesh technology. In addition, the pallet assembly also includes accessories, including: a mooring net, a mooring belt and a mooring ring (usually a D-type shackle), etc.

[0042] When in use, the goods stacked on the pallet are locked with mooring nets and mooring straps to form an integral container; the container can be hoisted by a crane, forked by an air transport loader, or loaded and unloaded by slide rails through a conveyor roller. The entire container can be transferred in one operation. It is efficient, convenient and adaptable, can effectively reduce the loading and unloading time, save a lot of manpower, facilitate mechanized operations, and improve the efficiency of military supply support.

[0043] This embodiment provides an aviation transport container pallet based on composite reinforced materials and using one-piece molding technology to achieve consistent interfaces.

[0044] The composite-based one-piece aviation transport container pallet includes a pallet body 1 and a tie-down ring 3 mounted on the pallet body 1 through a nut plate; wherein the pallet body 1 is a plate-like structure (i.e., a solid one-piece structure) formed by one-piece injection molding of a reinforced composite material; as an example, the reinforced composite material uses a 30% to 40% carbon fiber reinforced polyetheretherketone composite material, which is compatible with the excellent performance of polyetheretherketone and integrates the high strength performance of carbon fiber; it has high rigidity, high modulus, super wear-resistant self-lubricating and other characteristics, and can be used for injection molding and extrusion molding. The material has good heat resistance and excellent flame retardant properties.

[0045] The tray body 1 is made of reinforced composite material after integral injection molding. Figure 1 and Figure 3 The rectangular plate-like structure shown in the figure has a plurality of saw teeth 2 evenly spaced on the four sides of the rectangular plate-like structure; Figure 2 As shown, the integrally-injected pallet body 1 is provided with a mooring ring mounting opening 6 for mounting a mooring ring 3; the mooring ring mounting opening 6 is located at the four corners of the pallet body 1 and between two adjacent serrations 2; thereby ensuring that the pallet is consistent with the interface of the existing air transport container pallet.

[0046] The one-piece molding technology is adopted, and the composite bonding and riveting process of the traditional air transport container pallet is abandoned, so that the overall structure of the pallet body 1 is better, the difficulty of the process is reduced, and the one-time mold opening can realize repetitive injection molding production.

[0047] After the integral molding of the pallet body 1 is completed, a nut plate is installed in the mooring ring installation port 6 of the pallet body 1. The nut plate is made of stainless steel and has threaded holes. It is connected to the mooring ring 3 by screws to play a lining reinforcement role and ensure the installation strength of the mooring ring 3. The nut plate includes Figure 5 The strip nut plate 4 shown and Figure 6 The right-angle nut plate 5 shown in the figure is used to provide a connection interface for the mooring ring 3 (i.e., the nut plate is provided with a threaded hole for threaded connection with the mooring ring 3). The strip nut plate 4 is installed in the mooring ring installation opening 6 between two adjacent saw teeth 2, and the right-angle nut plates 5 are installed in the mooring ring installation openings 6 at the four corners. Figure 4 As shown, a strip nut plate 4 is installed in the tie-down ring installation opening 6 between two adjacent serrations 2 , and the tie-down ring 3 cooperates with the threaded hole on the strip nut plate 4 to achieve its installation on the pallet body 1 .

[0048] After the nut plate is installed in the mooring ring installation opening 6, the mooring ring installation opening 6 is still open. In order to maintain the integrity of the pallet structure, each mooring ring installation opening 6 is partially filled with reinforced composite material by secondary injection molding. Figure 7 As shown, the structure of the tray body 1 is complete.

[0049] After the above process is completed, the outer surface of the pallet body 1 is sprayed with a reinforcement coating to enhance the surface hardness and scratch resistance; as an example, the outer surface of the pallet body 1 is sprayed with a rice reinforcement material to form a nano-enhanced coating; it can not only enhance the surface hardness and scratch resistance, but also achieve aviation-grade complete flame retardancy. Therefore, after the two-component nano-enhanced coating is sprayed, the pallet's anti-corrosion, flame retardancy, hardness and other properties can be further improved.

[0050] The test shows that the rated load of the air transport container pallet of the present invention is not less than 4500kg. It adopts 30% to 40% carbon fiber reinforced polyetheretherketone composite material, and the tensile strength can reach 250MPa to 260MPa. Its overall performance is better than that of aluminum alloy and wood glue riveted composite structure, and its anti-deformation ability is better and its structural rigidity is better. At the same time, its density is 140kg / m 3 The final overall mass of the pallet is less than 80kg, which is smaller than the existing aviation container pallet. Its load-bearing performance is more suitable for airdrop and air transport integrated pallets.

[0051] The present invention is based on the use of reinforced composite materials to replace the traditional materials and processes of traditional aluminum alloy and wood core composites, and uses an integrally formed complete structure to replace the adhesive composite process structure, so that it has the same mechanical properties and has better lightweight and flame retardant properties, while reducing production costs and achieving recycling and repeated use.

[0052] Embodiment 2:

[0053] This embodiment provides a method for processing the composite material-based integrally formed aviation transport container pallet.

[0054] The reinforced composite material used for the integral molding of the tray body 1 is hot-melt heated by particles of a mixed material, and hot-melt flow of the raw materials is achieved through special heating and pressurizing equipment, and has the physical state of injection molding and extrusion.

[0055] The processing technology of the one-piece aviation transport container pallet is generally divided into three processes:

[0056] First, the molding process of the pallet body 1: using the one-piece injection molding process, a special mold is opened (that is, the mold is opened according to the structure of the pallet body 1 to be molded), the mold is divided into an upper mold and a lower mold, which can be tightly pressed, and the cavity between the two is used for one-piece injection molding; through the injection port of the upper mold, the hot-melt composite material with physical fluidity is injected into the above cavity, and after maintaining the set pressure and cooling, the one-piece injection molding of the pallet body 1 is completed. After molding, the pallet body 1 is finely processed, and key parts such as the tie-down ring installation port 6, the edge of the pallet body 1, and the outer surface are processed and trimmed, so as to form a size and outer surface that meets the set technical indicators.

[0057] After finishing the pallet body 1, the nut plate and the mooring ring 3 are installed. After the mooring ring 3 is installed, the mooring ring installation openings 6 are filled with secondary injection molding. During the secondary injection molding filling, the mooring ring installation openings 6 at different positions can be injected and filled at the same time. The secondary injection molding filling adopts a scheme of pressure injection molding of the hot-melt composite material.

[0058] After the secondary injection molding is completed, the formed tray is trimmed as a whole, burrs and residual solidified foreign matter on the surface are removed, and the surface of the tray body 1 is roughened to reduce the surface flatness, so that it has the conditions for spraying the outer two-component reinforcement coating and has stronger coating adhesion. Finally, the reinforcement coating is sprayed and cured.

[0059] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A reinforced composite one-piece aviation transport container pallet, characterized in that: include: A pallet body (1) and a tie-down ring (3) mounted on the pallet body (1) via a nut plate; The pallet body (1) is a plate-shaped structure formed by integral injection molding of a reinforced composite material; A plurality of saw teeth (2) are evenly spaced on the four sides of the integrally injection-molded tray body (1); and a tether ring installation opening (6) is reserved for installing a tether ring (3); A nut plate is installed in the mooring ring installation opening (6), and the nut plate is used to provide a connection interface for the mooring ring (3); After the mooring ring (3) is installed, each mooring ring installation opening (6) is partially filled with a reinforced composite material by secondary injection molding.

2. The reinforced composite one-piece aviation transport container pallet according to claim 1, characterized in that: The reinforced composite material adopts 30% to 40% carbon fiber reinforced polyetheretherketone composite material.

3. The reinforced composite one-piece aviation transport container pallet according to claim 1, characterized in that: The outer surface of the tray body (1) is provided with a reinforcement coating.

4. The reinforced composite material integrally formed aviation transport container pallet according to claim 3, characterized in that: The enhanced coating is a nano-enhanced coating.

5. The reinforced composite one-piece aviation transport container pallet according to any one of claims 1 to 4, characterized in that: The ring installation openings (6) are located at the four corners of the pallet body (1) and between two adjacent saw teeth (2); Based on this, the nut plate comprises a strip nut plate (4) and a right-angle nut plate (6); wherein the strip nut plate (4) is installed in the mooring ring installation opening (6) between two adjacent saw teeth (2), and the right-angle nut plates (5) are installed in the mooring ring installation openings (6) at the four corners.

6. A method for processing a reinforced composite material integrally formed aviation transport container pallet, characterized in that: The container pallet is an aviation transport container pallet integrally formed of a reinforced composite material as described in any one of claims 1 to 5 above; First, the tray body (1) is molded: a one-piece injection molding process is used to inject a hot-melt reinforced composite material with physical fluidity into the mold cavity used for molding; after cooling at a set pressure, the one-piece injection molding of the tray body (1) is completed; after molding, the tray body (1) is finely processed; After finishing the pallet body (1), the nut plate and the mooring ring (3) are installed. After the mooring ring (3) is installed, the installation openings (6) of each mooring ring are filled with secondary injection molding.

7. The method for processing the reinforced composite material integrally formed aviation transport container pallet according to claim 6, characterized in that: After the secondary injection molding is completed, the formed pallet is trimmed as a whole, and the surface of the pallet body (1) is roughened to make it ready for spraying of the reinforcement coating, and then the reinforcement coating is sprayed and cured on the surface of the pallet.

8. The method for processing the reinforced composite material integrally formed aviation transport container pallet according to claim 6 or 7, characterized in that: The method for forming a hot-melt reinforced composite material with physical fluidity is as follows: The particles of raw materials used to reinforce composite materials are hot-melted, heated and pressurized to achieve hot-melt flow of the raw materials.

9. The method for processing the reinforced composite material integrally formed aviation transport container pallet according to claim 6 or 7, characterized in that: During the secondary injection molding filling, the mooring ring installation openings (6) at different positions are simultaneously injection molded and filled, and the secondary injection molding filling performs pressure injection molding on the hot-melt reinforced composite material.

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