CN102644352B

CN102644352B - Radial telescopic net support with fixed support

Info

Publication number: CN102644352B
Application number: CN201210059424.6A
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: 2014-04-16
Anticipated expiration: 2032-03-08
Also published as: CN102644352A

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

There is the radial expansion rack of 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 the past few decades, various countries scholars have proposed the concept of many large span retractable Roof Structures systems, and some of them are applied in the folding house roof of the large-scale stadiums such as tennis venue, swimming place and hall and track and field venue.American engineer Huo Baiman (Hoberman) is devoted to research and the design of opening-closing structure since the later stage eighties in last century, mainly bias toward the application of opening-closing structure.Hoberman has proposed a kind of radial expansion rack by Hoberman cell formation in his patent ^[2].Hoberman unit is to be cut with scissors at middle part and be formed by connecting by scissors by the cantilevered corner beam unit of two sections of bendings that equate, when two cantilevered corner beam unit rotate around middle scissors hinge, the angle of beam-ends remains constant.Utilize this character n identical Hoberman unit can be coupled together and form closed annular linkage.

But all nodes of this radial expansion rack based on Hoberman scissors unit have larger radial displacement in the motion process of system.When using radial expansion rack as retractable Roof Structures, general folding house roof is all supported on fixed structure, and the radial displacement of these nodes has brought very large difficulty to the design of roof structure lower support system.

Summary of the invention

In order to overcome the defect 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 meet the various functions requirement of building to roof system folding, also there is the advantages such as design and easy construction, can meet preferably medium and small span and build the requirement to roof system folding function.

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 described Huo Baiman radial expansion rack is provided with annular linkage, described annular linkage comprises by the straight-bar identical with described Huo Baiman radial expansion rack external node number connecting from beginning to end, 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 described Huo Baiman radial expansion rack external node, on described Huo Baiman radial expansion rack external node, be also hinged with a connecting rod, the other end of this connecting rod is hinged with a last bar, / 2nd places in straight-bar described in the other end of end bar is hinged on.

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, the present invention is stretched by radial expansion rack, realize the folding of roof system, and be connected with radial expansion rack by the built-in parallelogram linkage on the shape bar of positive n limit, and in the moving process of roof system, the positive n limit shape bar being positioned at outside radial expansion rack remains static all the time, therefore, the strong point on the positive n limit shape bar of retractable Roof Structures is not radially there is no radial motion in retractable roof structure motion process, thereby makes support conditions simple; And its structure rationally, design and construction simple, be particularly suitable for the building of medium and small span.

Accompanying drawing explanation

Below in conjunction with drawings and Examples, the present invention is described in more detail:

Fig. 1 is structural representation of the present invention.

Fig. 2 is the flexible rack closure state schematic diagram of inner radial.

Fig. 3 is the flexible rack motion process schematic diagram 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 linkage schematic diagram.

Fig. 7 is quadric chain schematic diagram in outside annular linkage.

Fig. 8 is outside annular linkage schematic diagram.

Fig. 9 is outside annular connecting rod mechanism movement process schematic diagram.

Figure 10 is retractable roof structure motion process schematic diagram radially.

The specific embodiment

A kind of radial expansion rack with fixed bearing, comprise: Huo Baiman radial expansion rack, in the outside of radial expansion rack, be provided with annular linkage, described annular linkage comprises the positive n limit shape bar consisting of the n root straight-bar 1 connecting from beginning to end, n is not less than 3 and be not more than 720, on every straight-bar 1, be respectively equipped with linkage unit, described linkage unit is comprised of built-in parallel-crank mechanism, the two ends of described straight-bar 1 are fixedly connected with bearing, described built-in parallel-crank mechanism is by fixed bar, side rod 2, connecting rod 3 and last bar 4 form, and fixed bar is 1/2nd straight-bars, one end of one end of fixed bar and side rod 2 is rotationally connected, one end of the other end of side rod 2 and connecting rod 3 is rotationally connected, one end of the other end of connecting rod 3 and last bar 4 is rotationally connected, the end other end of bar 4 and the other end of fixed bar are rotationally connected, and, when the complete closure state of structure, the extended line of described side rod 2 is by positive n Bian Xinggan center, in annular linkage, any one end of each built-in parallel-crank mechanism connecting rod respectively with corresponding being rotationally connected of node in radial expansion rack outmost turns, in the present embodiment, described radial expansion rack can be connected with linkage unit respectively by all nodes of its outmost turns, also can be connected with linkage unit respectively by its outmost turns part of nodes, but at least contain 3 equally distributed connected 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.

Below with reference to Figure of description, the specific embodiment of the present invention is made to more detailed explanation:

As shown in Figure 1, the radial expansion rack that has a fixed bearing comprises inner plane grid system and outside annular linkage.By its outmost turns, all or part of nodes and outside annular linkage are hinged inner plane grid system.

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

Its inner mesh is that Hoberman linkage (refers to US Patent 5,024,031,1991, radial expansion space truss structure Radial expansion/retraction truss structure[P] .), Fig. 2 and 3 is respectively its closure state and part opening schematic diagram.The scissors unit being most widely used is at present parallel scissors unit as shown in Figure 4.From geometry angle, consider, every pair of connecting rod of this class scissors unit is connected by a middle pin-connected joints, and every pair of connecting rod only can relatively rotate around vertical and this axis to connecting rod place plane, and other degree of freedom is restricted completely; Connection between scissors unit is by the hinged realization of unit endpoint node simultaneously.The line keeping parallelism of this unit its endpoint node in motion process.American engineer Hoberman improves scissors unit, pole scissors unit has been proposed, it is at middle part, to be connected by pin-connected joints by two bending angle beam elements that equate, when two cantilevered corner beam unit rotate around middle pin-connected joints, the angle of beam end node line remains unchanged, as shown in Figure 5.Because this unit remains unchanged at the angle of motion process medial end portions node line, can copy multiple pole scissors unit at hoop, thereby form closed annular linkage, as shown in Figure 6.Two pole grids shown in Fig. 6 can radially be expanded to many poles net, and its kinetic characteristic will remain unchanged, and every beam is as shown in Figure 3 five poles.

But the shortcoming of this linkage is that its all nodes all produce certain radial displacement in motion process, especially, when outmost turns node produces 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 with stationary nodes, for being connected with bearing.

The forming process of outside annular linkage is as follows:

The outer link mechanism of the present embodiment comprises the join end to end positive 16 limit shape bars of composition of 16 straight-bars, and the built-in parallel-crank mechanism arranging on every straight-bar.Because structure is polar curve symmetrical structure, get one of them element analysis, as shown in Figure 7, ABCD is a quadric chain, wherein rod piece A B is through positive 16Bian Xing center.The utmost point symmetry of utilizing structure, mirror image can obtain system as shown in Figure 8, is outer link mechanism, and its post exercise is illustrated as shown in Figure 9.

The outmost turns node of inner Hoberman linkage is connected with inner ring nodes such as the B shown in Fig. 8, E, can obtains having the radially radial expansion rack of fixed bearing, as shown in Figure 1.In its motion process, the schematic diagram of structure as shown in figure 10.

Claims

1. one kind has the radial expansion rack of fixed bearing, comprise: Huo Baiman radial expansion rack, it is characterized in that: the outside at described Huo Baiman radial expansion rack is provided with annular linkage, described annular linkage comprises by the straight-bar (1) identical with described Huo Baiman radial expansion rack external node number connecting from beginning to end, 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 described Huo Baiman radial expansion rack external node, on described Huo Baiman radial expansion rack external node, be also hinged with a connecting rod (3), the other end of this connecting rod (3) is hinged with a last bar (4), / 2nd places in straight-bar (1) described in the other end of end bar (4) is hinged on.

2. the radial expansion rack with fixed bearing according to claim 1, is characterized in that, described radial expansion rack is single layer mesh 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.