JPS60210004A - Node joint of skeleton supporting structure made of fibrous composite material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a structure in which the rods and reflector panels of a frame support structure are made of a synthetic resin material (CFX: carbon fiber synthetic material) reinforced with carbon fibers. The present invention relates to a joint joint for fixing a reflector panel in a frame support structure of a radio telescope such as the present invention.

[Conventional technology and problems]

This type of joint has the following requirements: - high rigidity, - disassembly of the frame support structure for inspection and assembly, - low thermal expansion, - light weight, - reliable support of the panels and sub-reflectors to the support structure, - The following are required: small moment generation in the joints due to the support of the panels, introduction of small moments into the panel due to the single support, simple assembly of the panels and good accessibility to the adjustment elements.

[Purpose of the invention]

The object of the invention is to apply it to frame support structures made of fiber composite materials, at the same time allowing good adjustment of the reflector panels, so that once trained, readjustment is required at large time intervals. The goal is to create joints that are just like that.

[Summary of the invention]

This object can be achieved by the means set forth in claim 1. Further developments of the invention are described in the embodiment claims.

〔Example〕

The present invention will be described in detail below based on embodiments shown in the drawings.

FIG. 1 shows the principle of a frame support structure for a radio telescope. The main reflector 4 consists of a panel 6 supported on a frame support structure 10 consisting of nodes 8' and bars 9.

The sub-reflector 12 is arranged within the main reflector 4 and its supporting legs 14 are supported on the nodes 8.

The central member of the node 8 shown in FIGS. 2, 3 and 3 is a spherical, double conical or polygonal hollow body 16 into which the rods 9 of the frame support structure abut. Corresponding to the number, bottles 18 are inserted into the rod 9 in the respective direction. The connection between the hollow body 16 and the bottle 18 is made by welding, brazing, shrink fitting, gluing or screw connections, depending on the material and the loads to be applied (a fillet weld connection is shown in the drawing).

The bin 18 may be flat (flat) between the contacting end surfaces of the shaft 9 of the framework support structure, or It is formed into a spherical shape.

A flexible rod connection is thereby produced via a positive or force connection (a flexible force connection is shown in FIGS. 2 and 3).

The rod connections of the frame support structure (FIGS. 2 and 3) are made with cap nuts 22 and screws. Bag nut 22 based on Figure 2
With this type, the rod head elements and four, which are screwed together and attached to the rod 9 made of fiber-reinforced material, are assembled in tension or in compression, so that in the direction of the rod there is a very high A rigid rod connection is achieved.

A cross-shaped plate with a centering protrusion 32 is placed on the hollow body 16 (see FIG. 4), and a bolt 34 and a fitting pin 3 are attached to the hollow body 16.
It is held in position by 6. The holes 37 between the cruciform plates are used to accommodate panel support bushings, which are tightly fastened to the cruciform plate I by bolts 40.

Support legs 14 for the sub-reflector 12 are also placed between the cross-shaped plates as necessary (not shown). Depending on the geometry (angular position of the support legs), receiving holes 36 for panel support bushings 38 are provided between the cross-shaped plates, which determines the size between the cross-shaped plates.

Next, the adjustment device 31 will be explained.

At the supporting points of the segment-shaped panel 6, there are a board 39 connected to each other by bolts 45 and a plate 42 for tightening.
There is. There is an adjustment plate 44 between both plates 39 and 42, and when the bolt 43 is loosened, the adjustment plate 44 is connected to the plates 39 and 42 through a long hole 46 (see FIG. 6) (for example, The tightening is effected by an eccentric wrench passed through a hole 48 in plate 42 (see FIG. 8) and fitted with its eccentric pin into a slot 52 in adjustment plate 44. This adjustment plate 44 is engaged and connected to a projection 56 (see FIG. 4) of a plate 58 through a slit 54. Furthermore, the plate 58 partially engages the spherical bolt 60 and is partially held in force connection by the pressure of the spring 61, so that this plate 58 cannot be displaced horizontally relative to the spherical bolt 60. spherical pol)
60 is fixed by a pin 62, and the adjustment bolt 43
It is adjusted against the spring 6'' by. The spherical bolt 60 supports a female thread 63, into which the bolt 43 is screwed.

This arrangement provides the following adjustment possibilities for the panel 6: That is, 1. Tightening (with an eccentric wrench) is performed by moving the plate 42 in the horizontal direction (X direction or y direction); 2.
Vertical adjustment by moving the spherical bolt 6o in the axial direction using the adjustment bolt 43; 3. Tightening on the panel is done by the arrangement of the plate 42 or the plate 58.
Removal of the protrusion 56 in allows free movement of the nozzle relative to the framework support structure in the horizontal direction (x-y direction 1) for thermal expansion.

FIG. 8 shows the panel 6 of FIG. 1 in plan view, in which the movability and adjustment possibilities for the bolts 60 are shown. A rectangular opening in the panel that allows movement in the direction of movement (double arrow) is a small rectangular mortar, and
The position of the freely movable support in the −7 direction is indicated by a small circle.

FIG. 9 shows a different embodiment of the adjusting device of FIG.

In FIG. 9, the adjustment bolt 43 in FIG. 4 is the differential bolt 7.
It has been changed to 0. The differential bolt 70 has a female thread 72 and a male thread 74 = the male thread 74 fits into the threaded portion 76 between the panel support bushings, and the female thread 72JI
'i cooperates with the male threaded portion 78 of the spherical bolt 60. The pitches of the bolts and bolts are mutually determined so that the differential action advances the spherical bolt 60 when the bolt 70 rotates. By tightening or loosening the spherical bolt 70 by a small angle, minimal precise height adjustment occurs in the spherical bolt 60.

FIG. 10 shows two joints 8 from FIGS. 1 to 3, in which the ball heel is designed as a milled part. The ends of the rods 9 are screwed into these parts (see reference numeral 88). During assembly, the rod 9 is fitted between the stationary joints 8 and one head 80 of the rod 9 is screwed into the joints 8. The threaded part 82, which is supported in the pusher pusher 84 at the other end of the rod 9, is largely recessed into the rod 9 and is now pulled out of the rod 9 and screwed into the other joint 8 (see reference numeral 88).

Cap nut 86 is then screwed in and tightened against bush 84 and rod 9.

[Brief explanation of the drawing]

Figure 1 is a principle diagram of the frame support structure of a radio telescope, Figures 2 and 3 are plan views of the structure for fixing the joints of the frame support structure to rods, and Figure 4 is a joint with a panel support section. 5 to 7 are cross-shaped plates in FIG. 4, adjustment plates and closures are plan views of the plates, FIG. 8 is a plan view of the panel, and FIG. 9 is a plan view of the panels. FIG. 10 is a cross-sectional view of a different embodiment of the rod-to-node connection. 4: Main reflector, 6: Panel, 8: Node, 9: Rod, η; Cap nut, (material); Cross-shaped plate, 31: Adjustment device, 34: Bolt, 37; Hole, 38 = Panel support bush. 43: Adjustment bolt, 44: Tightening plate, 58: Plate, 60: Spherical bolt, 61: Spring, 70: Differential bolt, 72: Female thread, 7
4: Male thread, 76: Threaded portion, 78: Male threaded portion. Applicant's agent Kiyoshi Inomata Engraving of the drawing (no changes to the content) Fig, 2 Fig, 4 Fig, 5 Fig, 6 Otsu 6 Fig, 10 Procedural procedure Masakatsu Yama: (Tsuno style) % formula % [1 1 case Indication of 1971 II Patent Application No. 271084 2 Name of the invention Joint joint for a frame support structure made of fiber-bonded material 3 Relationship to the case of the person making the amendment Patent applicant Dornier, System, Gepirsi 17) 1- , Mituto, Beschrenktel, Hachifutsung 4 Agents 3-chome Marunouchi, Chiyoda-ku, Tokyo [12-3 Telephone Tokyo (21
1) 2,321 representatives April 10, 1988 (Shipping date: April 30, 1985) 6. Drawings subject to amendment.

Claims (1)

[Claims] 1. A knot joint for fixing a reflector panel in a frame support structure of a radio telescope, in which the rods of the frame support structure and the reflector panel are made of a fiber composite material or metal, A bottle α8 is attached to the sphere (8), and the end of this bottle α is fixed with a threaded connection (22, ss) to a rod (9) made of fiber composite material, which rod (9)
A hole in the ball (8) which is fixed to the cruciform plate (30) by bolts 04 and a cruciform for accommodating the adjustment device (3t) screwed to the reflector panel (6) and loaded with a spring force. A node joint of a framework support structure made of a fiber composite material, characterized in that it is always kept in a compressed state by the holes (30) in the plate (30). ) with a bulbous head in its hole) (
60), the shank of which has a female thread (63) into which the adjusting bolt (4 East screw) is screwed, and a spherical head (60
) is attached to the panel support bushing (
2) A joint according to claim 1, characterized in that it acts on an annular spring (61) surrounding the bush (2) and supported by a portion of the collar of the bush (2). 3. The plate (58) for receiving the spherical head' (6) has a protrusion (56) that is guided to the lower plate (4ψ slit (54)) Nodal joint according to paragraph 1 or 2. 4. The spherical bolt (60) is connected to a differential bolt device (70, 72, 74, 76) that allows fine adjustment of the panel (6). A knot joint according to claim 1, characterized in that: