CN210947135U - Composite member connected by bolt-ball joints - Google Patents
Composite member connected by bolt-ball joints Download PDFInfo
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- CN210947135U CN210947135U CN201921420234.6U CN201921420234U CN210947135U CN 210947135 U CN210947135 U CN 210947135U CN 201921420234 U CN201921420234 U CN 201921420234U CN 210947135 U CN210947135 U CN 210947135U
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Abstract
The utility model relates to a composite component connected by adopting a bolt-sphere joint, which comprises a joint sphere body (6) and at least one pipe fitting, wherein one end of each converged pipe fitting is fixed on the joint sphere body (6) through threaded connection; the pipe fitting comprises a thin-wall circular pipe (1), a foam filler (2), a metal rod (3), a cover plate (4) and a sleeve (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 circular pipe (1) is positioned at the outermost layer of the component, the cover plates (4) are arranged at two ends of the thin-wall circular pipe, 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). Compared with the prior art, the utility model provides a local unstability problem of composite member, vertical bearing capacity is showing and is improving, has solved the problem that member and ball joint are connected in the aluminum alloy structure simultaneously.
Description
Technical Field
The utility model relates to a composite member especially relates to an adopt composite member of bolt ball nodal connection.
Background
The aluminum alloy material has the advantages of light weight, high strength, good corrosion resistance, convenient processing, capability of being integrally formed and the like, and is widely applied to the field of large-span space structures, such as garden greenhouses, large-scale dry coal bunker top covers, oil storage tank arch items, sewage treatment plant ceilings and the like.
The stud ball node is also called MERO node, which is a utility model of Germany MERO corporation in 1942, and is introduced into China from Germany in the 70 s.
Traditional aluminum alloy bolt ball node comprises several parts of node spheroid, bolt, sleeve, fastening screw, conical head and shrouding, at first will put the conical head or the shrouding welding of bolt at the pipe fitting both ends when constructing, overlaps the sleeve on the screw rod that stretches out conical head or shrouding to fastening screw is in the same place bolt and muffjoint. When the connecting structure is assembled, the sleeve is directly screwed, the bolt is driven to rotate through the fastening screw, so that the bolt is screwed into the sphere until the bolt head is tightly attached to the sealing plate or the conical head, and the junction pipe fittings are connected in the mode to form the node.
However, the traditional aluminum alloy bolt ball joint has the disadvantages that the whole bearing capacity is greatly weakened and the installation process is complicated due to the welding process of the two ends of the pipe in the construction process.
Therefore, how to design a ball joint connection that is pleasing to the eye, simple to operate, bearing capacity height, the pipe fitting need not welding process simultaneously just can be connected with the node spheroid, becomes the urgent problem that awaits solution in the engineering.
Patent CN 204435566U discloses a bolt ball node steel grid connection structure, including bolt A and bolt B, the bolt ball node steel grid connection structure main body is by bolt ball, a plurality of closing plate heads, bolt, steel pipe, a plurality of sleeves, a plurality of conical heads, the bolt is a plurality of bolts A and a plurality of bolts B, the bolt ball is a solid metal ball with a plurality of bolt holes, bolt A passes through the closing plate head and the bolt hole on the bolt ball to close, bolt B passes through the bolt hole on the sleeve and the bolt ball to close, the closing plate head blocks the head of bolt A, the closing plate head is a T-shaped metal cylinder, the closing plate head is fixedly connected to the tail end of the steel pipe; the sleeve is a metal cylinder, and a fastening screw is arranged between the sleeve and the bolt B; the tail end of conical head is the toper, and the center section of conical head is the cavity drum, and the end of conical head is provided with the round hole that the diameter is less than the center section internal diameter of conical head, but this structure exists following not enoughly:
(1) in the structure, the bolt adopts an independent structure, and the bolt ball is connected with the rod piece through the end plate head and the sleeve, so that the force transmission of the connection mode is indirect, and the bolt is easy to wear due to fatigue; and this application adopts the mode of opening the screw thread at punching metal pole both ends, and it is more direct high-efficient to pass power.
(2) The structure adopts the fastening screw to connect the sleeve and the bolt, and the method has higher requirement on the strength of the screw and the screw is easy to wear; the bolt in the application belongs to a part of the rod structure piercing metal rod, connection does not need to be additionally arranged, and the bolt is more convenient to mount and more reliable in strength.
(3) Compare the traditional steel material that this structure adopted, node and member are made in the processing of the aluminum alloy material that this application adopted the performance more excellent, and the quality is lighter, and intensity is higher, accords with the trend of modernized structure material.
SUMMERY OF THE UTILITY MODEL
The purpose of the utility model is to provide a composite member that is showing the bearing capacity that improves the load pipe fitting, reduces the construction degree of difficulty, practices thrift the adoption bolt ball nodal connection of aluminum product in order to overcome the defect that above-mentioned prior art exists.
The purpose of the utility model can be realized through the following technical scheme:
a composite member connected by adopting a bolt-sphere node comprises a node sphere and at least one pipe fitting, wherein one end of the pipe fitting is fixedly connected onto the node sphere through threads, the pipe fitting is screwed into the sphere, and the pipe fittings are connected in this way to form the bolt-sphere node.
The pipe fitting comprises a thin-wall round pipe, foam filler, a metal rod, a cover plate and a sleeve; the metal rod penetrates through the thin-wall circular tube and is positioned at the central axis of the pipe fitting, the metal rod integrally penetrates through the foam filler and applies prestress, and sleeves are arranged at two ends of the metal rod; the thin-wall circular pipe is positioned on the outermost layer of the pipe fitting, both ends of the thin-wall circular pipe are provided with cover plates, and the sleeve is abutted to the cover plates; and foam filler is filled between the thin-wall circular tube and the metal rod.
Furthermore, the node sphere comprises a sphere, and a plurality of small holes are formed in the sphere.
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.
Furthermore, the number of the pipe fittings is 2-6, the pipe fittings are axially and symmetrically distributed with each other, and the distribution mode can avoid stress concentration.
Further, the sleeve is located outside the cover plate.
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 pipe fitting.
Furthermore, the thin-wall round tube is made of aluminum alloy; the metal rod is made of aluminum alloy or steel; the cover plate is made of aluminum alloy or brass.
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) because the polyurethane-aluminum alloy composite component is adopted, the thin-wall circular tube and the metal rod are connected through the polyurethane foam filler, so that the composite component is endowed with good stress and deformation performance due to the interaction of the aluminum alloy circular tube and the polyurethane foam in the mechanical effect, on one hand, the wall of the circular tube provides limitation to the polyurethane foam filled in the circular tube, and 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. Meanwhile, 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; kd-an aluminum alloy property influencing factor; f. of0.2-nominal yield strength of the aluminium alloy; ke-a polyurethane property influencing factor.
The calculation results show that the bearing capacity can be improved by 50% compared with the component adopting the traditional bolt-ball joint connection.
(2) The two ends of the feed-through metal rod are engraved with threads during machining, so that the pipe fitting can be directly connected with the node ball body through the threads in the aluminum alloy latticed shell structure, the welding procedure of the traditional aluminum alloy pipe fitting when being connected with the node is avoided, and the strength of the connecting node is obviously improved.
Drawings
FIG. 1 is an overall schematic view in example 1;
FIG. 2 is a schematic plan view of example 1;
FIG. 3 is a schematic view of an assembling method in example 1;
FIG. 4 is a detailed end view of the pipe member in example 1;
FIG. 5 is a schematic view of a node sphere in embodiment 1;
the reference numbers in the figures indicate: the device comprises a thin-wall circular tube 1, a foam filler 2, a metal rod 3, a cover plate 4, a sleeve 5 and a node sphere 6.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Example 1
A composite member using a bolted spherical joint, as shown in figures 1-2, comprises a spherical joint body 6 and at least one pipe fitting, wherein one end of the pipe fitting is fixed on the spherical joint body 6 through threaded connection, the pipe fitting is screwed into the spherical body, and the pipe fittings are connected in this way to form the bolted spherical joint.
As shown in FIG. 5, the nodding sphere 6 comprises a round sphere, and the round sphere is provided with 6 small holes.
As shown in fig. 4, the pipe fitting comprises an aluminum alloy thin-wall round pipe 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, the shape of the cover plate 4 is bowl-shaped, and the shape can effectively relieve the stress when the foam filling material expands. The number of the pipe fittings is 6, the pipe fittings are axially and symmetrically distributed, and the stress concentration can be avoided by the distribution mode. 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 assembly method, as shown in fig. 3, 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; then, covering cover plates 4 with notches in the shape of the section of the circular tube on two sides of the aluminum alloy thin-wall circular tube 1, connecting the cover plates 4 with the metal rod 3 in the center through a sleeve 5, transferring force, and applying prestress to the thin-wall circular tube 1 to form a pipe fitting;
finally, 6 pipe fittings are screwed into the node ball body 6 until the two pipe fittings are tightly attached, and the converged pipe fittings are connected according to the mode to form the composite member connected by the bolt ball nodes.
Threads are carved at two ends of the metal rod during processing, so that the metal rod can be directly connected with a ball joint through the threads in an aluminum alloy latticed shell structure, and a complex welding procedure is avoided; test results show that the bearing capacity can be improved by 50% compared with that of a composite member connected by a traditional bolt-ball joint.
Example 2
A composite member using a bolted spherical joint, as shown in fig. 1-2, comprising a spherical joint body 6 and at least one pipe fitting, wherein one end of the pipe fitting is fixed to the spherical joint body 6 by a screw connection, the pipe fitting is screwed into the spherical body, and the pipe fittings are connected in this way to form the bolted spherical joint.
Referring to fig. 5, the nodding sphere 6 includes a round sphere with 2 small holes.
Referring to fig. 4, the pipe fitting comprises an aluminum alloy thin-wall round pipe 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.
The cover plate 4 is in a circular truncated cone shape, and the stress of the foam filler during expansion can be effectively relieved due to the circular truncated cone shape. The pipe fitting quantity is 2, mutual symmetric distribution, and stress concentration can be avoided to such distribution mode. 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.
Referring to fig. 3, the specific assembly 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; then, covering cover plates 4 with notches in the shape of the section of the circular tube on two sides of the aluminum alloy thin-wall circular tube 1, connecting the cover plates 4 with the metal rod 3 in the center through a sleeve 5, transferring force, and applying prestress to the thin-wall circular tube 1 to form a pipe fitting;
finally, 2 pipe fittings are screwed into the node ball body 6 until the two pipe fittings are tightly attached, and after all the converging pipe fittings are connected according to the mode, the composite member adopting the bolt ball node connection is formed.
Threads are carved at two ends of the metal rod during processing, so that the metal rod can be directly connected with a ball joint through the threads in an aluminum alloy latticed shell structure, and a complex welding procedure is avoided; test results show that the bearing capacity can be improved by 50% compared with that of a composite member connected by a traditional bolt-ball joint.
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 (9)
1. A composite component using a bolted-spherical joint connection, which component comprises a joint sphere (6) and at least one tube, one end of which is fixed to the joint sphere (6) by means of a threaded connection,
the pipe fitting comprises a thin-wall round pipe (1), foam filler (2), a metal rod (3), a 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 pipe fitting, sleeves (5) are arranged at two ends of the metal rod, the thin-wall circular tube (1) is positioned at the outermost layer of the pipe fitting, cover plates (4) are arranged at two ends of the thin-wall circular tube, 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 composite member using a bolt and ball joint connection according to claim 1, characterized in that said joint ball (6) comprises a round ball having a plurality of small holes.
3. A composite component using a bolt-and-ball joint connection according to claim 1, characterized in that the shape of the cover plate (4) is bowl-shaped or truncated cone-shaped.
4. The composite structural member connected by the bolt-ball joint as claimed in claim 1, wherein the number of the pipe fittings is 2-6, and the pipe fittings are axially and symmetrically distributed.
5. A composite component using a bolt-and-ball joint connection according to claim 1, characterised in that the sleeve (5) is located outside the cover plate (4).
6. A composite member using a bolted ball joint according to claim 1, characterized in that said sleeve (5) is internally threaded and is screwed to the metal rod (3).
7. The composite member connected by the bolt-ball joint as claimed in claim 1, wherein the thin-walled circular tube (1) is made of aluminum alloy; the metal rod (3) is made of aluminum alloy or steel; the cover plate (4) is made of aluminum alloy or brass.
8. A composite member using a node bolt-and-ball joint connection according to claim 1, characterized in that the material selected for the foam filler (2) is polyurethane foam.
9. A composite member using a bolted-spherical joint connection according to claim 1, characterized in that 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 |
|---|---|---|---|
| CN201921420234.6U CN210947135U (en) | 2019-08-29 | 2019-08-29 | Composite member connected by bolt-ball joints |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921420234.6U CN210947135U (en) | 2019-08-29 | 2019-08-29 | Composite member connected by bolt-ball joints |
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| CN210947135U true CN210947135U (en) | 2020-07-07 |
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| CN201921420234.6U Active CN210947135U (en) | 2019-08-29 | 2019-08-29 | Composite member connected by bolt-ball joints |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110512724A (en) * | 2019-08-29 | 2019-11-29 | 同济大学 | A kind of composite component connected using bolted spherical node |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110512724A (en) * | 2019-08-29 | 2019-11-29 | 同济大学 | A kind of composite component connected using bolted spherical node |
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