CN211114088U - Prestressed polyurethane-aluminum alloy composite member - Google Patents
Prestressed polyurethane-aluminum alloy composite member Download PDFInfo
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- CN211114088U CN211114088U CN201921420235.0U CN201921420235U CN211114088U CN 211114088 U CN211114088 U CN 211114088U CN 201921420235 U CN201921420235 U CN 201921420235U CN 211114088 U CN211114088 U CN 211114088U
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Abstract
The utility model relates to a prestressing force polyurethane-aluminum alloy composite member, this component includes thin wall pipe (1), foam filler (2), metal pole (3), apron (4) and sleeve (5), metal pole (3) be located component central axis department, its both ends all are equipped with sleeve (5), thin wall pipe (1) be located the component outmost, its both ends all are equipped with apron (4), sleeve (5) and apron (4) butt; and a foam filler (2) is filled between the thin-wall circular tube (1) and the metal rod (3). Compared with the prior art, the utility model provides a local unstability problem that the aluminum alloy thin wall pipe axial pressurized leads to, vertical bearing capacity can show the improvement, has solved the problem of member and ball node connection in the aluminum alloy latticed shell structure simultaneously to practice thrift the aluminum alloy ex-trusions, and construction convenience.
Description
Technical Field
The utility model relates to a load component especially relates to a prestressing force polyurethane-aluminum alloy composite member.
Background
At present, I-shaped aluminum rod pieces are still commonly used as force bearing components in the aluminum alloy latticed shell structure. The traditional aluminum alloy thin-wall round tube has the advantages of light weight, attractive appearance and simple and easy processing.
However, when the pipe wall of the aluminum alloy circular pipe is too thin, the aluminum alloy circular pipe is easy to partially buckle under axial pressure, and cannot normally work, so that the traditional aluminum alloy thin-wall circular pipe cannot be put into an aluminum alloy space latticed shell structure on a large scale. Meanwhile, due to structural limitation of the ball joint in the traditional aluminum alloy latticed shell structure, a rod piece is required to have a welding process at the end, and the welding greatly weakens the overall strength of the aluminum alloy member.
Therefore, how to design an aluminum alloy force bearing component which is light, beautiful and high in bearing capacity and can be connected with a ball joint in a latticed shell structure without welding processing becomes a problem to be solved urgently in engineering.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the defect that above-mentioned prior art exists and providing one kind and having solved the local unstability problem that the aluminum alloy thin wall pipe axial pressurized leads to, vertical bearing capacity can show and improve, has solved the problem that member and ball joint connect in the aluminum alloy latticed shell structure simultaneously to practice thrift the aluminum alloy ex-trusions, and construction convenience's prestressing force polyurethane-aluminum alloy composite member.
The purpose of the utility model can be realized through the following technical scheme:
a prestressed polyurethane-aluminum alloy composite member comprises a thin-wall round tube, foam filler, a metal rod, a cover plate and sleeves, wherein the metal rod is positioned at the central axis of the member, integrally penetrates through the foam filler, applies prestress, and the sleeves are arranged at two ends of the metal rod; the thin-wall circular tube is positioned at the outermost layer of the component, the two ends of the thin-wall circular tube are respectively provided with a cover plate, and the sleeve is abutted against the cover plates to transmit pressure load to the thin-wall circular tube; and foam filler is filled between the thin-wall circular tube and the metal rod.
Furthermore, both ends of the metal rod are engraved with threads so as to be connected with the latticed shell node through a bolt.
Furthermore, the sleeve is internally provided with threads and is in threaded connection with the metal rod, so that the metal rod is prevented from axially sliding in the composite component.
Furthermore, the material of the thin-wall circular tube comprises aluminum alloy, and the tube diameter and the wall thickness of the thin-wall circular tube are designed according to the actual engineering.
Further, the material of the metal rod comprises aluminum alloy or steel.
Further, the material of the cover plate comprises aluminum alloy or brass.
Furthermore, the cover plate is bowl-shaped or round table-shaped, and the shape can effectively relieve the stress of the foam filler when expanding.
Further, the selected material of the foam filler is polyurethane foam.
Furthermore, the ratio of the diameter of the metal rod to the diameter of the thin-wall round tube is 1: 5-10.
Furthermore, the cover plate covers the thin-wall circular tube from two ends.
Furthermore, the center of the cover plate is provided with a hole for the metal rod to pass through.
Further, the sleeve is located outside the cover plate.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the polyurethane foam material has the characteristics of good deformation and kinetic energy absorption, and can alleviate impact, weaken amplitude, reduce stress amplitude and inhibit local buckling of the metal pipe wall. On the aspect of mechanical effect, the interaction of the aluminum alloy circular tube and the polyurethane foam endows the composite member with good stress and deformation performance, on one hand, the wall of the circular tube limits the polyurethane foam filled in the circular tube, so that the polyurethane foam is in a three-dimensional stress state; on the other hand, the polyurethane foam provides restraint for local deformation of the wall of the aluminum alloy circular tube, and retards or weakens concave or convex local buckling damage generated after the wall is stressed, so that generation and development of integral buckling of the circular tube are limited.
Therefore, polyurethane is filled in the aluminum alloy round pipe, so that the bearing capacity of the thin-wall pipe can be effectively improved on the premise of not greatly influencing the weight of the aluminum alloy member, and the local instability is prevented. Improve the whole structure of the componentThe bearing capacity is pressed, the whole weight of the member is not greatly improved, and the characteristics of light weight and high strength of the aluminum alloy member are maintained; the bearing capacity of the composite member is influenced by a plurality of factors, such as the diameter-thickness ratio (wall thickness), the slenderness ratio (tube length), the initial defect amplitude, the polyurethane performance, the aluminum alloy performance (mark) and the like of a round tube, a numerical formula of each factor on the polyurethane lifting effect is fitted based on a large number of calculation results, and a polyurethane lifting coefficient K is combined0And further obtaining a polyurethane aluminum alloy composite thin-wall circular tube column bearing capacity fitting formula:
K0＝1.75·Ka·Kb·Kd·Ke
wherein:
-a local stability factor; k0-polyurethane lifting factor; ka-a aspect ratio influencing factor; kb-slenderness ratio impact factor; kdAluminum alloy property influencing factor f0.2-nominal yield strength of the aluminium alloy; ke-a polyurethane property influencing factor.
The calculation result shows that the bearing capacity can be improved by 60 percent compared with the traditional aluminum alloy thin-wall circular tube component.
(2) The feed-through metal pole is carved with the screw thread at man-hour both ends, makes the utility model discloses can directly be connected with ball joint through the screw thread in aluminum alloy latticed shell structure, welding processes when having avoided traditional aluminum alloy component and nodal connection is showing the intensity that has promoted connected node.
Drawings
FIG. 1 is an overall schematic view in example 1;
FIG. 2 is a schematic view of a thin-walled circular tube in example 1;
FIG. 3 is a schematic view of a cover plate in example 1;
the reference numbers in the figures indicate: the device comprises a thin-wall round tube 1, a foam filler 2, a metal rod 3, a cover plate 4 and a sleeve 5.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Example 1
A prestressed polyurethane-aluminum alloy composite member is shown in figure 1-2 and comprises an aluminum alloy thin-wall round tube 1, a polyurethane foam filler 2, an aluminum alloy metal rod 3, an aluminum alloy cover plate 4 and a sleeve 5; the metal rod 3 penetrates through the thin-wall circular tube 1 and is positioned at the central axis of the tube, integrally penetrates through the foam filler 2, applies prestress, and is provided with sleeves 5 at two ends; the thin-wall circular tube 1 is positioned on the outermost layer of the pipe fitting, the two ends of the thin-wall circular tube are provided with cover plates 4, and the sleeve 5 is abutted to the cover plates 4; and a foam filler 2 is filled between the thin-wall circular tube 1 and the metal rod 3.
Wherein, as shown in fig. 3, the cover plate 4 is bowl-shaped, and the shape can effectively relieve the stress when the foam filling material expands. The sleeve is located outside the cover plate 4. The sleeve 5 is internally threaded and is in threaded connection with the metal rod 3 to prevent the metal rod 3 from sliding axially in the pipe fitting. The ratio of the diameter of the metal rod 3 to the diameter of the thin-wall round tube 1 is 1: 5.
The specific assembling method comprises the following steps:
firstly, filling foam filler 2 in a thin-wall circular tube 1; then a metal rod 3 penetrates through the foam filler 2 along the central line of the circular tube; and finally, covering cover plates 4 with notches in the cross section shapes of the thin-wall circular tubes 1 on two sides of the thin-wall circular tubes 1, connecting the cover plates 4 with the central metal rod 3 through sleeves 5, transferring force, and applying prestress on the aluminum alloy rods 1 to form a prestress polyurethane-aluminum alloy composite component.
The test result shows that the bearing capacity can be improved by 60 percent compared with the traditional aluminum alloy thin-wall circular tube component; and the aluminum alloy metal rod 3 is carved with the screw thread at the both ends when processing, makes it can directly be connected with the ball joint through the screw thread in aluminum alloy latticed shell structure, avoids complicated welding process.
Example 2
A prestressed polyurethane-aluminum alloy composite member, referring to fig. 1-2, comprises an aluminum alloy thin-wall round tube 1, a polyurethane foam filler 2, a steel metal rod 3, a brass cover plate 4 and a sleeve 5; the metal rod 3 penetrates through the thin-wall circular tube 1 and is positioned at the central axis of the tube, integrally penetrates through the foam filler 2, applies prestress, and is provided with sleeves 5 at two ends; the thin-wall circular tube 1 is positioned on the outermost layer of the pipe fitting, the two ends of the thin-wall circular tube are provided with cover plates 4, and the sleeve 5 is abutted to the cover plates 4; and a foam filler 2 is filled between the thin-wall circular tube 1 and the metal rod 3.
Referring to fig. 3, the cover plate 4 is in the shape of a truncated cone, and such a shape can effectively reduce the stress when the foam filler expands. The sleeve is located outside the cover plate 4. The sleeve 5 is internally threaded and is in threaded connection with the metal rod 3 to prevent the metal rod 3 from sliding axially in the pipe fitting.
The specific assembling method comprises the following steps:
firstly, filling foam filler 2 in a thin-wall circular tube 1; then a metal rod 3 penetrates through the foam filler 2 along the central line of the circular tube; and finally, covering cover plates 4 with notches in the cross section shapes of the thin-wall circular tubes 1 on two sides of the thin-wall circular tubes 1, connecting the cover plates 4 with the central metal rod 3 through sleeves 5, transferring force, and applying prestress on the aluminum alloy rods 1 to form a prestress polyurethane-aluminum alloy composite component.
The test result shows that the bearing capacity can be improved by 60 percent compared with the traditional aluminum alloy thin-wall circular tube component; and the aluminum alloy metal rod 3 is carved with the screw thread at the both ends when processing, makes it can directly be connected with the ball joint through the screw thread in aluminum alloy latticed shell structure, avoids complicated welding process.
The above embodiments are only used for illustrating the technical solution of the present invention, and are not intended to limit the present invention, and those skilled in the art can make equivalent changes, substitutions, modifications, and simplifications within the scope of the present invention, without departing from the spirit of the present invention, and shall also fall within the protection scope of the claims of the present invention.
Claims (8)
1. The prestressed polyurethane-aluminum alloy composite component is characterized by comprising a thin-wall round pipe (1), a foam filler (2), a metal rod (3), cover plates (4) and sleeves (5), wherein the metal rod (3) is positioned at the central axis of the component, the sleeves (5) are arranged at two ends of the metal rod, the thin-wall round pipe (1) is positioned at the outermost layer of the component, the cover plates (4) are arranged at two ends of the thin-wall round pipe, and the sleeves (5) are abutted to the cover plates (4); and a foam filler (2) is filled between the thin-wall circular tube (1) and the metal rod (3).
2. A pre-stressed polyurethane-aluminium alloy composite structure according to claim 1, wherein the metal rod (3) is threaded at both ends.
3. A pre-stressed polyurethane-aluminium alloy composite component according to claim 1, wherein the cover plate (4) is bowl-shaped or truncated cone-shaped.
4. A pre-stressed polyurethane-aluminium alloy composite component according to claim 1, wherein the sleeve (5) is located outside the cover plate (4).
5. A pre-stressed polyurethane-aluminium alloy composite member according to claim 1, wherein the sleeve (5) is internally threaded and is in threaded connection with the metal rod (3).
6. A prestressed polyurethane-aluminium alloy composite structure according to claim 1, wherein the thin-walled circular tube (1) is made of aluminium alloy; the metal rod (3) is made of aluminum alloy or steel; the cover plate (4) is made of aluminum alloy or brass.
7. A pre-stressed polyurethane-aluminium alloy composite structure according to claim 1, wherein the material selected for the foam filler (2) is polyurethane foam.
8. A pre-stressed polyurethane-aluminium alloy composite component according to claim 1, wherein the ratio of the diameter of the metal rod (3) to the diameter of the thin-walled circular tube (1) is 1: 5-10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921420235.0U CN211114088U (en) | 2019-08-29 | 2019-08-29 | Prestressed polyurethane-aluminum alloy composite member |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921420235.0U CN211114088U (en) | 2019-08-29 | 2019-08-29 | Prestressed polyurethane-aluminum alloy composite member |
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| CN211114088U true CN211114088U (en) | 2020-07-28 |
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| CN201921420235.0U Active CN211114088U (en) | 2019-08-29 | 2019-08-29 | Prestressed polyurethane-aluminum alloy composite member |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110512738A (en) * | 2019-08-29 | 2019-11-29 | 同济大学 | A kind of prestressing force polyurethane-aluminium alloy compound component |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110512738A (en) * | 2019-08-29 | 2019-11-29 | 同济大学 | A kind of prestressing force polyurethane-aluminium alloy compound component |
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