CN102644352A

CN102644352A - Radial telescopic net support with fixed support

Info

Publication number: CN102644352A
Application number: CN2012100594246A
Authority: CN
Inventors: 蔡建国; 冯健
Original assignee: Southeast University
Current assignee: Southeast University
Priority date: 2012-03-08
Filing date: 2012-03-08
Publication date: 2012-08-22
Anticipated expiration: 2032-03-08
Also published as: CN102644352B

Abstract

The invention discloses a radial telescopic net support with a fixed support. The radial telescopic net support comprises a Hoberman radial telescopic net support, wherein an annular connecting rod mechanism is arranged outside the Hoberman radial telescopic net support, and comprises straight bars which are connected end to end and of which the quantity is the same as that of external joints of the Hoberman radial telescopic net support; the two ends of the straight bars are fixedly connected with the support; a side bar is hinged on a connecting point between every two adjacent straight bars; the other ends of the side bars are hinged on the external joints of the Hoberman radial telescopic net support; a connecting rod is hinged on the external joints of the Hoberman radial telescopic net support; the other end of the connecting rod is hinged with a tail bar; and the other end of the tail bar is hinged at a half position of each straight bar. The radial telescopic net support is telescopic, and is connected to a support through the annular connecting rod mechanism, so that supporting conditions are simplified; and moreover, the radial telescopic net support has a reasonable structure, is easy to design and construct, and is particularly suitable for medium and small-span buildings.

Description

Radial expansion rack with fixed bearing

Technical field

The present invention relates to a kind of space truss structure, especially a kind of radial expansion rack with fixed bearing.

Background technology

In decades in the past, the various countries scholars have proposed the notion of many large span Retractable Roof Structures systems, and some of them are applied in the folding house roof of large-scale stadiums such as tennis venue, swimming place and hall and track and field venue.U.S. engineer Huo Baiman (Hoberman) is devoted to the research and the design of opening-closing structure since the later stage eighties in last century, mainly biases toward the application of opening-closing structure.Hoberman has proposed a kind of radial expansion rack that is made up of the Hoberman unit in his patent ^[2]The Hoberman unit is to be formed by connecting at the middle part through the scissors hinge the cantilevered corner beam unit that two equal segments bends, and when two cantilevered corner beam unit rotated around the scissors hinge of centre, the angle of beam-ends remained constant.Utilize this attributes can n identical Hoberman unit be coupled together and form the closed annular linkage.

Yet all nodes of this radial expansion rack based on Hoberman scissors unit have bigger radial displacement in the motion process of system.When the radial expansion rack during as Retractable Roof Structures, general folding house roof all is supported on the fixed structure, and the radial displacement of these nodes has brought very big difficulty for the design of roof structure lower support system.

Summary of the invention

In order to overcome the defective of existing radial expansion rack technology; The invention provides a kind of radial expansion rack with fixed bearing; This structure is during as folding house roof; Can not only satisfy each item functional requirement of building, also have advantages such as design and easy construction, can satisfy of the requirement of medium and small span building preferably roof system folding function to the roof system folding.

In order to achieve the above object, the present invention has adopted following technical scheme:

A kind of radial expansion rack with fixed bearing; Comprise: Huo Baiman radial expansion rack; It is characterized in that: the outside at the described radial expansion of Berman suddenly rack is provided with annular linkage; Described annular linkage comprise connect by head and the tail with the identical straight-bar of the said radial expansion of Berman suddenly rack external node number, the two ends of this straight-bar are fixedly connected with bearing, a hinged side rod on the tie point of adjacent two straight-bars; The other end of this side rod is hinged on the described radial expansion of the Berman suddenly rack external node; On the described radial expansion of Berman suddenly rack external node, also be hinged with a connecting rod, the other end of this connecting rod is then hinged with a last bar, the other end of last bar then be hinged on described straight-bar in 1/2nd places.

Described radial expansion rack is single layer mesh, double layer grid or multi-layer net.

Described radial expansion rack be shaped as circle or regular polygon.

The invention has the beneficial effects as follows that the present invention is stretched by the radial expansion rack, realize the folding of roof system; And the built-in parallelogram linkage that passes through on the shape bar of positive n limit links to each other with the radial expansion rack; And in the moving process of roof system, be positioned at the outer positive n limit shape bar of radial expansion rack to remain static all the time, therefore; The strong point on the positive n limit shape bar of Retractable Roof Structures does not have radial motion in radially opening the roof structure motion process, thereby makes support conditions simple; And its structure rationally, design and construction be simple, is particularly suitable for the building of medium and small span.

Description of drawings

Below in conjunction with accompanying drawing and embodiment to further explain of the present invention:

Fig. 1 is a structural representation of the present invention.

Fig. 2 is the flexible rack closure state sketch map of inner radial.

Fig. 3 is the flexible rack motion process sketch map of inner radial.

Fig. 4 is parallel scissors cell schematics.

Fig. 5 is pole scissors cell schematics.

Fig. 6 is that pole scissors unit makeup ring is to the linkage sketch map.

Fig. 7 is a quadric chain sketch map in the outer annular linkage.

Fig. 8 is an outer annular linkage sketch map.

Fig. 9 is an outer annular connecting rod mechanism movement process sketch map.

Figure 10 radially opens roof structure motion process sketch map.

The specific embodiment

A kind of radial expansion rack with fixed bearing comprises: Huo Baiman radial expansion rack is provided with annular linkage in the outside of radial expansion rack; Described annular linkage comprises the positive n limit shape bar that the n root straight-bar 1 that connected by head and the tail constitutes, and n is not less than 3 and be not more than 720, on every straight-bar 1, is respectively equipped with the linkage unit; Described linkage unit is made up of built-in parallel-crank mechanism, and the two ends of said straight-bar 1 are fixedly connected with bearing, and described built-in parallel-crank mechanism is made up of fixed bar, side rod 2, connecting rod 3 and last bar 4; And fixed bar is 1/2nd straight-bars; One end of fixed bar and an end of side rod 2 are rotationally connected, and an end of the other end of side rod 2 and connecting rod 3 is rotationally connected, and an end of the other end of connecting rod 3 and last bar 4 is rotationally connected; The other end of end bar 4 and the other end of fixed bar are rotationally connected; And when the complete closure state of structure, the extended line of said side rod 2 is through the center of positive n limit shape bar; In annular linkage; Any end of each built-in parallel-crank mechanism connecting rod respectively with radial expansion rack outmost turns on corresponding being rotationally connected of node, in the present embodiment, described radial expansion rack can be connected with the linkage unit respectively through all nodes of its outmost turns; Also can be connected with the linkage unit respectively, but contain 3 equally distributed connected nodes at least through its outmost turns part of nodes; Described radial expansion rack is single layer mesh or double layer grid or multi-layer net; The shape of described radial expansion rack can be circle or polygon.

With reference to Figure of description, specific embodiments of the invention is made more detailed explanation below:

As shown in Figure 1, the radial expansion rack with fixed bearing comprises inner plane grid system and outer annular linkage.The inner plane grid system is hinged through its outmost turns all or part of nodes and outer annular linkage.

The shape of inner plane grid system can be circle or polygon.This instance be shaped as circle, like Fig. 1～shown in Figure 10.

Its inner mesh is that the Hoberman linkage (sees US Patent 5 for details; 024,031,1991; Radial expansion space truss structure Radial expansion/retraction truss structure [P] .), Fig. 2 and 3 is respectively its closure state and part opening sketch map.Using the most at present, the scissors unit is parallel scissors unit as shown in Figure 4.Consider that from the geometry angle every pair of connecting rod of this type scissors unit links to each other through a middle pin joint node, every pair of connecting rod only can relatively rotate around vertical and this axis to plane, connecting rod place, and other degree of freedom is restricted fully; Connection between the scissors unit is through the hinged realization of unit endpoint node simultaneously.The line keeping parallelism of this unit its endpoint node in motion process.U.S. engineer Hoberman improves the scissors unit; Pole scissors unit has been proposed; It is to be connected at the middle part through the pin joint node by two bending angle beam elements that equate; When two cantilevered corner beam unit rotated around the pin joint node of centre, the angle of beam end node line remains unchanged, and was as shown in Figure 5.Because this unit remains unchanged at the angle of motion process medial end portions node line, can duplicate a plurality of pole scissors unit at hoop, thereby form the closed annular linkage, as shown in Figure 6.Two pole grids shown in Figure 6 can radially be expanded to many poles net, and its kinetic characteristic will remain unchanged, and every beam as shown in Figure 3 is five poles.

But the shortcoming of this linkage is that its all nodes all produce certain radial displacement in motion process, and especially when the outmost turns node produced radial displacement, it is very complicated that the establishment of the support conditions of this roof system will become.For this reason, the present invention proposes a kind of outer shroud linkage, be used for being connected with bearing with stationary nodes.

The forming process of outer annular linkage is following:

The outer link mechanism of present embodiment comprises the positive 16 limit shape bars that 16 straight-bars join end to end and form, and the built-in parallel-crank mechanism that is provided with on every straight-bar.Because structure is the polar curve symmetrical structure, gets one of them element analysis, as shown in Figure 7, ABCD is a quadric chain, and wherein rod piece A B passes the center of positive 16 limit shapes.Utilize the utmost point symmetry of structure, mirror image can obtain system as shown in Figure 8, is outer link mechanism, and its post exercise signal is as shown in Figure 9.

The outmost turns node of inner Hoberman linkage is linked to each other with inner ring nodes such as B shown in Figure 8, E, can obtain having the radially radial expansion rack of fixed bearing, as shown in Figure 1.The sketch map of structure is shown in figure 10 in its motion process.

Claims

1. radial expansion rack with fixed bearing; Comprise: Huo Baiman radial expansion rack; It is characterized in that: the outside at the described radial expansion of Berman suddenly rack is provided with annular linkage; Described annular linkage comprise connect by head and the tail with the identical straight-bar (1) of the said radial expansion of Berman suddenly rack external node number, the two ends of this straight-bar (1) are fixedly connected with bearing, a hinged side rod (2) on the tie point of adjacent two straight-bars (1); The other end of this side rod (2) is hinged on the described radial expansion of the Berman suddenly rack external node; On the described radial expansion of Berman suddenly rack external node, also be hinged with a connecting rod (3), the other end of this connecting rod (3) is then hinged with a last bar (4), the other end of last bar (4) then be hinged on described straight-bar (1) in 1/2nd places.

2. the radial expansion rack with fixed bearing according to claim 1 is characterized in that described radial expansion rack is single layer mesh, double layer grid or multi-layer net.

3. the radial expansion rack with fixed bearing according to claim 1 is characterized in that, described radial expansion rack be shaped as circle or regular polygon.