CN111486170A - FAST reflecting surface unit self-adaptive connecting mechanism reinforcing device - Google Patents

Abstract

The invention relates to the technical field of FAST radio astronomical telescopes, in particular to a FAST reflecting surface unit self-adaptive connecting mechanism reinforcing device, which comprises: the upper reinforcing plate, the node shaft clamping tile, the two upper chord clamping tiles and the plurality of bolt fasteners are arranged on the upper reinforcing plate; the upper reinforcing plate is penetrated and installed on the small panel supporting stud; the upper reinforcing plate is arranged above one node shaft and the two upper chords corresponding to the node shaft; the node shaft clamping bush is clamped and sleeved below the node shaft, and the node shaft clamping bush is connected with the upper reinforcing plate through a bolt fastener; the two upper chord clamping tiles are respectively clamped and sleeved below the two upper chord clamping tiles, and each upper chord clamping tile is connected with the upper reinforcing plate through a bolt fastener. The self-adaptive connecting mechanism is reinforced by the reinforcing structure, so that the occurrence of faults of the self-adaptive connecting mechanism can be reduced, and a large amount of maintenance work is avoided after the faults occur.

Description

A FAST reflective surface unit adaptive connection mechanism reinforcement device

technical field

The invention relates to the technical field of FAST radio astronomical telescopes, in particular to a reinforcement device for an adaptive connection mechanism of a FAST reflection surface unit.

Background technique

The Five-hundred-meter Aperture Spherical RadioTelescope (FAST) is a major scientific installation during the 11th Five-Year Plan period in my country. It is the largest single-aperture radio astronomical telescope in the world. It has three independent innovations: the use of natural karst in Guizhou The pit serves as the site, the actively deformed reflective surface, and the support of the flexible and light feed that is driven in parallel by six cables.

The FAST reflective surface uses flexible cable nets as the main support structure and key components for active deformation. The cable network structure includes 6670 main cables, 2225 down cables and 2225 cable network node disks. Each pull-down cable is connected to a hydraulic actuator and anchored to the ground pier. Each node disk is connected with the 6 adjacent main cables to form a huge main cable network, which is also the basis of the geometry of the FAST reflection surface. By coordinating and controlling the telescopic motion of 2,225 hydraulic actuators, and then driving the motion of the main cable and the node disk, the shape of the reflecting surface can be changed, such as the reference spherical surface (curvature radius of 300 meters) and the rotating paraboloid required for astronomical observation ( caliber 300 meters) and so on.

The surface area formed by the main cable network mainly adopts the geodesic segmentation method. The whole area is divided into 4300 approximate equilateral triangle domains and 150 edge quadrilateral domains, and each node disk is located at the vertex of these triangles and quadrilaterals. All-aluminum alloy reflective surface units are installed in each triangular domain and quadrilateral domain of the main cable net to cover the entire area and form a FAST reflective surface. A gap of about 65mm is left between adjacent reflecting surface units to ensure that adjacent units will not collide and interfere when the surface shape of the reflecting surface changes. The triangular unit has a side length of about 11 meters and a weight of about 450-480Kg. Each vertex of the reflecting surface element is constrainedly connected to its corresponding cable network node disk through an adaptive connection mechanism. For triangular elements, different vertices are connected to different adaptive connection mechanisms, which can be divided into three types: 0# connection mechanism, 1# connection mechanism and 2# connection mechanism. The 0# connection mechanism constrains 3 translational degrees of freedom, the 1# connection mechanism constrains 2 translational degrees of freedom, and the 2# connection mechanism constrains one translational degree of freedom. The six degrees of freedom of the rigid reflective surface element are constrained by such a constrained connection method, thereby ensuring that the reflective surface element is connected to the cable-net structure in a simply supported constraint manner, and no additional internal force will be caused by the movement and deformation of the cable-net structure itself.

The adaptive connection mechanism of the FAST reflective surface unit is a completely innovative product, and there are no ready-made examples for reference. It needs to continuously improve the original product design and installation process in the cycle of failure-improvement-update. The lubrication of the adaptive connecting mechanism is very important, but due to long-term exposure to the field environment, the lubrication performance will deteriorate with the increase of working time, and may even fail, resulting in the adaptive connecting mechanism unable to eliminate the active deformation of the reflective surface through internal sliding. The relative position changes, thereby compromising the reflective surface unit.

With reference to Figure 1, the figure illustrates the connection relationship between the adaptive connection mechanism of the FAST reflective surface unit and the reflective surface back frame. The connection mechanism 1 (can be any one of 0#, 1#, and 2# connection mechanisms), the vertical hole of the node axis ball node of the connection structure is connected with a small reflective panel support stud 2, a flat washer 4, and a nut 3, It is used to support the small reflective panel. When the small reflective panel needs to be folded, remove the upper nut 3 and the flat washer 4, fold the small reflective panel over, and support it on the lower flat washer 4 and nut 3; when the small panel needs to be fixed , just install the removed flat washer 4 and nut 3. At this time, the support plate of the small panel is fastened by the upper and lower washer nuts. The node shaft ball node of the connection mechanism 1 is respectively connected with the upper chord 5, the upper chord 6 and a web rod 7, and the connection is realized by screwing the high-strength bolt of the rod into the screw hole of the bolt ball node. However, when a failure occurs at the connecting mechanism, bending of the upper chord 5, the upper chord 6, the web 7, and the fracture or deformation of the high-strength bolts of the rods may occur.

The information disclosed in this Background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a reinforcement device for the adaptive connection mechanism of the FAST reflective surface unit, so as to solve the technical problems existing in the prior art.

In order to achieve the above object, the present invention adopts the following technical solutions:

The invention provides a reinforcement device for an adaptive connection mechanism of a FAST reflective surface unit, which comprises: an upper reinforcement plate, a node shaft clamp, two upper chord clamps and several bolt fasteners; the upper reinforcement plate is fitted with The stud is supported on the small panel; the upper reinforcement plate is arranged above a node shaft and the two upper chords corresponding to the node shaft; the node shaft clamping shoe is clamped under the node shaft, and the node shaft clamping It is connected with the upper reinforcement plate by bolt fasteners; the two upper chord clamps are respectively clamped under the two upper chord clamps, and each of the upper chord clamps and the upper reinforcement plate is connected. connected by bolt fasteners.

As a further technical solution, the bolt fastener includes: a high-strength bolt and a spring washer and a flat washer sleeved on the high-strength bolt.

As a further technical solution, the bottom of the upper reinforcement plate is provided with a half-shaft hole for being fastened above the node shaft; the node-shaft clamping bush is provided with a half-shaft hole for ferrule below the node shaft ; The upper reinforcement plate and the half-shaft hole surface of the node shaft clamp are evenly coated with epoxy resin glue.

As a further technical solution, the bottom of the upper reinforcing plate is provided with a half-shaft hole for being fastened above the upper chord; the upper chord clamp is provided with a half-shaft hole for clipping under the upper chord ; The upper reinforcement plate and the half shaft hole surface of the upper chord clamp are evenly coated with epoxy resin glue.

As a further technical solution, the upper reinforcing plate is provided with through holes through which the small panel support studs pass.

As a further technical solution, the bottom of the upper reinforcing plate is provided with an accommodating space adapted to the node shaft and ball node.

As a further technical solution, the node axis is any one of the node axis of the 0# connection mechanism, the node axis of the 1# connection mechanism, and the node axis of the 2# connection mechanism.

Adopt above-mentioned technical scheme, the present invention has following beneficial effect:

The reinforcement device for the adaptive connection mechanism of the FAST reflective surface unit provided by the present invention includes: an upper reinforcement plate, a node shaft clamp, two upper chord clamps and several bolt fasteners. The reinforcement structure is used for the adaptive connection mechanism. Reinforcement can reduce the occurrence of faults of the adaptive connecting mechanism, and avoid a lot of maintenance work after the fault occurs.

Description of drawings

In order to illustrate the specific embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the accompanying drawings used in the description of the specific embodiments or the prior art. Obviously, the accompanying drawings in the following description The drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

Fig. 1 is the schematic diagram of the FAST reflective surface unit adaptive connection mechanism provided by the prior art;

Fig. 2 is the schematic diagram of the FAST reflective surface unit adaptive connection mechanism reinforcement device provided by the present invention;

3 is a cross-sectional view of a reinforcement device for an adaptive connection mechanism of a FAST reflective surface unit according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view of the reinforcement structure assembly at the upper chord according to an embodiment of the present invention.

Icon: 1-node shaft; 2-small panel support stud; 3-nut; 4-flat washer; 5-top chord; 6-top chord; 7-web rod; 8-high strength bolt; 9-spring washer; 10-flat washer; 11-upper chord clamp; 12-upper reinforcement plate; 13-node shaft clamp.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first", "second", and "third" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

In the description of the present invention, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, but not to limit the present invention.

Referring to FIGS. 2 to 4 , the present embodiment provides a reinforcement device for an adaptive connection mechanism of a FAST reflective surface unit, which includes: an upper reinforcement plate 12 , a node shaft clamp 13 , two upper chord clamps 11 , and several Bolt fasteners; the upper reinforcement plate 12 is mounted on the small panel support studs 2 (preferably, the upper reinforcement plate 12 is provided with through holes for the small panel support studs 2 to pass through); the upper reinforcement The plate 12 is arranged above a node shaft 1 and the two upper chords corresponding to the node shaft 1; the node shaft clamp 13 is clamped under the node shaft 1, and the node shaft clamp 13 is reinforced with the upper The plates 12 are connected by bolt fasteners; the two upper chord clamps 11 are respectively clamped under the two upper chord clamps 11, and each of the upper chord clamps 11 and the upper reinforcement plate 12 is connected. connected by bolt fasteners. Preferably, the node axis 1 is any one of the node axis 1 of the 0# connection mechanism, the node axis 1 of the 1# connection mechanism, and the node axis 1 of the 2# connection mechanism.

In this embodiment, the shape of the upper reinforcing plate 12 can be flexibly set according to actual needs.

For example, the cross section (projection plane) of the upper reinforcing plate 12 may be an octagon. Among them, the first side is perpendicular to the axis of node axis 1, the second side is vertically connected to the first side, and the second side is inclined to connect the third side, the fourth side, the fifth side, the sixth side, and the seventh side in turn. , the seventh side is perpendicular to the first side. Of course, this is only one of the forms, and other forms also belong to the protection scope of the present application.

In this embodiment, as a further technical solution, the bolt fastener includes: a high-strength bolt 8 and a spring washer 9 and a flat washer 10 sleeved on the high-strength bolt 8 .

In this embodiment, as a further technical solution, the bottom of the upper reinforcing plate 12 is provided with a half-shaft hole for being fastened above the node shaft 1; the node shaft clamping bush 13 is provided with a clamping sleeve The half shaft hole below the node shaft 1; the surface of the half shaft hole of the upper reinforcing plate 12 and the node shaft clamping bush 13 is uniformly coated with epoxy resin glue. Wherein, the bottom of the upper reinforcing plate 12 is provided with an accommodating space adapted to the spherical node of the node shaft 1 . Correspondingly, the node shaft clamping bush 13 may also be provided with a accommodating space adapted to the spherical node of the node shaft 1 .

In this embodiment, correspondingly, the bottom of the upper reinforcing plate 12 is provided with a half-shaft hole for being fastened above the upper chord; Axle hole; the upper reinforcement plate 12 and the half shaft hole surface of the upper chord clamp 11 are evenly coated with epoxy resin glue.

上加固板12与节点轴夹瓦13用弹簧垫圈9、平垫圈10和高强度螺栓8连接，按机械安装规范要求力矩及顺序拧紧螺栓，使上加固板12、节点轴夹瓦13连接紧固，在进行加工，其孔的尺寸及公差为

该孔与节点轴1安装夹紧时涂环氧树脂胶，涂覆的环氧树脂胶填充满孔轴间的间隙，待环氧树脂胶凝固后即可实现加固作用。Specifically, the diameter size of the node shaft 1 of the adaptive connection mechanism is:

The upper reinforcement plate 12 is connected with the node shaft clamp 13 by spring washers 9, flat washers 10 and high-strength bolts 8. Tighten the bolts according to the torque and sequence required by the mechanical installation specification, so that the upper reinforcement plate 12 and the node shaft clamp 13 are connected tightly. , during processing, the size and tolerance of the hole are

When the hole and the node shaft 1 are installed and clamped, epoxy resin glue is applied, and the coated epoxy resin glue fills the gap between the holes and shafts, and the reinforcement effect can be realized after the epoxy resin glue solidifies.

所以将上加固板12与上弦杆夹瓦11用弹簧垫圈9、平垫圈10和高强度螺栓8连接，按机械安装规范要求力矩及顺序拧紧螺栓，使上加固板12与上弦杆夹瓦11连接紧固，再进行加工，其孔的尺寸及公差为

该孔与上弦杆安装夹紧时涂环氧树脂胶，涂覆的环氧树脂胶填充满孔轴间的间隙，待环氧树脂胶凝固后即可实现加固作用。Specifically, the diameter of the upper chord rod is

Therefore, connect the upper reinforcement plate 12 and the upper chord clamp 11 with spring washers 9, flat washers 10 and high-strength bolts 8, and tighten the bolts according to the torque and sequence required by the mechanical installation specification to connect the upper reinforcement plate 12 with the upper chord clamp 11. Fasten, and then process, the size and tolerance of the hole are

When the hole and the upper chord are installed and clamped, epoxy resin glue is applied, and the applied epoxy resin glue fills the gap between the holes and shafts, and the reinforcement effect can be realized after the epoxy resin glue solidifies.

When installing this example:

1) First, pass the reinforcing plate 12 on the node shaft through the small panel support stud 2 from the top, and place it above the node shaft 1, the two upper chords 5, and the upper chord 6. Before placing, connect the upper reinforcing plate 12 to the node shaft. , The surface of the half shaft hole clamped by the two upper chord rods is evenly coated with epoxy resin glue;

2), then evenly coat the half shaft hole surface of the node shaft clamp 13 with epoxy resin glue and install it from the bottom at the position shown in the figure, place the flat washer 10 and the spring washer 9 from the top, penetrate the high-strength bolt 8, and install the The high-strength bolts 8 are screwed into the threaded holes of the node shaft clamps 13 .

3), respectively, evenly coat the half shaft hole surface of the two upper chord clamps 11 with epoxy resin glue and install it from the bottom at the position shown in the figure (the position of the upper chord 5 and the upper chord 6), and place the flat washer 10 from the top. , Spring washer 9, penetrate the high-strength bolt 8, and screw the high-strength bolt 8 into the threaded hole of the upper chord clamp 11.

4) Tighten the six high-strength bolts screwed into the three clamps alternately until they are fastened, and the reinforcement work is completed when the epoxy resin glue is solidified.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features thereof can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention. scope.

Claims (7)

1. An adaptive connection mechanism reinforcing apparatus for a FAST reflecting surface unit, comprising: the upper reinforcing plate, the node shaft clamping tile, the two upper chord clamping tiles and the plurality of bolt fasteners are arranged on the upper reinforcing plate; the upper reinforcing plate is penetrated and installed on the small panel supporting stud; the upper reinforcing plate is arranged above one node shaft and the two upper chords corresponding to the node shaft; the node shaft clamping bush is clamped and sleeved below the node shaft, and the node shaft clamping bush is connected with the upper reinforcing plate through a bolt fastener; the two upper chord clamping tiles are respectively clamped and sleeved below the two upper chord clamping tiles, and each upper chord clamping tile is connected with the upper reinforcing plate through a bolt fastener.

2. The FAST reflector unit adaptive attachment mechanism reinforcing apparatus of claim 1, wherein said bolt fastener comprises: the high-strength bolt comprises a high-strength bolt, and a spring washer and a flat washer which are sleeved on the high-strength bolt.

3. The FAST reflector unit adaptive attachment mechanism reinforcing apparatus of claim 1,

the bottom of the upper reinforcing plate is provided with a half shaft hole which is used for being buckled above the node shaft;

the node shaft clamping tile is provided with a half shaft hole for clamping and sleeving the lower part of the node shaft;

and epoxy resin glue is uniformly coated on the upper reinforcing plate and the half shaft hole surface of the node shaft clamping tile.

4. The FAST reflector unit adaptive attachment mechanism reinforcing apparatus of claim 1,

the bottom of the upper reinforcing plate is provided with a half shaft hole which is used for being buckled above the upper chord;

the upper chord clamping tile is provided with a half shaft hole for clamping and sleeving the lower part of the upper chord;

and epoxy resin glue is uniformly coated on the hole surfaces of the upper reinforcing plate and the half shafts of the upper chord clamping tile.

5. The FAST reflector unit adaptive connection mechanism reinforcing apparatus of claim 1, wherein the upper reinforcing plate is provided with through holes for the small panel support studs to pass through.

6. The FAST reflector unit adaptive connection mechanism reinforcing apparatus of claim 1, wherein the bottom of said upper reinforcing plate is provided with a receiving space for adapting to the node of the node axis sphere.

7. The FAST reflector unit adaptive connection mechanism reinforcing apparatus according to claim 1, wherein the nodal axis is any one of a nodal axis of a 0# connection mechanism, a nodal axis of a 1# connection mechanism, and a nodal axis of a 2# connection mechanism.

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