A support and observation device for a FAST reflector edge unit connecting mechanism

Abstract

The application discloses a FAST reflecting surface edge unit connecting mechanism support and observation device, which comprises a hoop assembly and a mirror assembly; wherein the hoop assembly is installed on the lower transverse pipe of the FAST reflecting surface ring beam and is used for supporting the 2# node shaft of the quadrilateral panel unit at the edge of the FAST reflecting surface; the mirror assembly is installed on the tray of the middle hoop of the hoop assembly; and the maintenance personnel can observe the node disc at the FAST reflecting surface ring beam and the working condition of the 2# connecting mechanism on the node disc through the convex mirror of the mirror assembly on the ring beam horse path, so as to judge whether the 2# node shaft is in a healthy working state. The area of the hoop tray is increased, and the connecting mechanism is prevented from interfering with the limiting door. The working condition of the 2# node shaft on the hoop tray can be observed by the personnel on the ring beam horse path; the daily inspection workload of the maintenance personnel is greatly reduced, and the safety of the maintenance personnel in high-altitude operation is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to a FAST reflector edge unit connecting mechanism support and observation device, which is installed on the cross pipe of the inner circle of the FAST reflector ring beam, plays a role of supporting and limiting the spatial position of the connecting mechanism, and also realizes that personnel on the ring beam horse path can observe the convex reflector on the device, and can clearly see the 2# connecting mechanism working condition of the node disc and the 2# connecting mechanism on the FAST reflector ring beam, so as to judge whether the 2# node shaft is in a healthy working state. BACKGROUND

[0002] The Five-hundred-meter Aperture Spherical radio Telescope (FAST) is the largest single-aperture radio astronomy telescope in the world, and has three independent innovations: using the natural karst depression in Guizhou as a site; an active deforming reflector; and a flexible light-weight mechanism with six parallel cables to drive the feed cabin to achieve one-time cable driving, and the AB rotating shaft mechanism and the Stewart parallel mechanism in the feed cabin to achieve secondary fine adjustment of the feed position, thereby achieving high-precision positioning of the feed.

[0003] The FAST reflector can realize instantaneous 300-meter aperture active deformation, and can change from a spherical surface to a parabolic surface, so as to ensure that the parabolic surface is always directed to the celestial body to be observed, and to focus the radio wave signals from the celestial body. At the same time, the feed receiver at the focal point position receives and processes the electric wave signals, and this process is continuous.

[0004] The FAST reflector is composed of a peripheral support structure (ring beam lattice column), a cable net, a reflector unit and a hydraulic actuator. The ring beam is a spatial truss ring beam structure with an inner diameter of more than 500 meters, a width of about 11 meters and a height of about 5 meters. 50 lattice columns are used as supports of the ring beam, 150 ear plates are welded on the spherical nodes on the bottom surface of the inner circle of the ring beam, the ear plates are connected with 150 edge main cables of the cable net, and the cable net structure supports and constrains 4450 reflector units. Among them, 4300 are triangular units, and 150 are quadrilateral panel units at the edge of the cable net.

[0005] Each corner point of the reflective surface unit is connected with the cable net node by a connecting mechanism, which can be divided into three types: 0# connecting mechanism, 1# connecting mechanism and 2# connecting mechanism. The 0# and 1# connecting mechanisms each include a bearing seat, a joint bearing and a node shaft; and the 2# connecting mechanism includes a node shaft, a spherical hinge seat, a spherical hinge and a PTFE slider fixed on the spherical pin. The 0# connecting mechanism restricts three translational degrees of freedom, the 1# connecting mechanism restricts two translational degrees of freedom, and the 2# connecting mechanism restricts one translational degree of freedom. The six degrees of freedom of the rigid reflective surface unit are restricted by such a connecting mode, so that the reflective surface unit is connected with the cable net structure in a simply supported manner and no additional internal force is caused due to the movement and deformation of the cable net structure.

[0006] The four corner points of the quadrilateral panel unit are fixed with four sets of connecting mechanisms, and two corner points near the ring beam are each provided with a 2# connecting mechanism. The 2# node shaft is supported on the hoop tray of the bottom horizontal pipe of the inner ring beam, and the hoop tray limits one normal translational degree of freedom of the 2# connecting mechanism. The 2# connecting mechanism can arbitrarily translate on the hoop tray, so as to release the displacement of the quadrilateral panel unit during the active deformation of the reflective surface of the FAST. Three points determine a plane. During the active deformation of the reflective surface, the 0# connecting mechanism, the 1# connecting mechanism and one of the two sets of 2# connecting mechanisms form a support plane, and the other set of 2# connecting mechanism is separated from the tray to form a lifting phenomenon. After the FAST runs for a certain period of time, the 2# connecting mechanisms of the quadrilateral panel unit and a small part of the bolted spherical net frame back frame members connected therewith are deformed and damaged. It is found that the translational space of the 2# connecting mechanism on the hoop tray is insufficient, the node shaft interferes with the upright column of the limiting door, and the lifted node shaft interferes with the beam of the limiting door, causing the deformation and damage of the bolted spherical net frame back frame members connected with the node shaft. The position is blocked by the ring beam component, and the working state of the 2# connecting mechanism on the hoop tray cannot be observed by personnel on the ring beam riding. It is difficult to find the fault. If the working state needs to be observed, the maintenance personnel need to cross the ring beam riding and climb to the inner ring horizontal pipe to observe closely. Because the number of the 2# connecting mechanisms reaches 300, the daily inspection workload is large, and the high-altitude operation of the maintenance personnel is very unsafe. The 2# connecting mechanisms can also be observed by installing monitoring videos, but the electronic monitoring equipment and wiring need to meet the requirements of the electromagnetic interference shielding of the FAST, which is difficult to realize and has high cost.

[0007] The information disclosed in this BACKGROUND section is only for the purpose of enhancing the understanding of the background of the present invention and should not be regarded as acknowledging or implying in any form that this information constitutes prior art known to those skilled in the art. SUMMARY

[0008] The purpose of the present application is to provide a FAST reflector edge unit connection mechanism support and observation device, which increases the area of the hoop tray and avoids the interference between the connection mechanism and the limiting door. Personnel on the circle beam horse path can observe the working condition of the 2# node shaft on the hoop tray.

[0009] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0010] The present application provides a FAST reflector edge unit connection mechanism support and observation device, comprising: a hoop assembly and a mirror assembly; wherein,

[0011] The hoop assembly is installed on the lower cross pipe of the FAST reflector circle beam, and is used to support the 2# node shaft of the quadrilateral panel unit at the edge of the FAST reflector; the mirror assembly is installed on the tray of the middle hoop of the hoop assembly, and the maintenance personnel on the circle beam horse path can observe the convex mirror of the mirror assembly to judge whether the 2# node shaft is in a healthy working state.

[0012] Further, the hoop assembly comprises an upper hoop, a lower hoop and a bolt pair; the upper hoop and the lower hoop are fixedly connected through the bolt pair; the lower hoop is welded with the tray, and the tray is used to support the 2# node shaft, and the 2# node shaft is fixedly connected with the quadrilateral reflector unit.

[0013] Further, the mirror assembly comprises two limiting door uprights, a limiting door cross beam, two mirror frame legs and a convex mirror; the lower ends of the two limiting door uprights are fixedly installed on the two sides of the tray through flat washers, elastic washers and hexagonal nuts respectively; the lower end holes of the mirror frame legs are fixedly connected with the limiting door uprights and the limiting door cross beam through external tooth locking washers, elastic washers and hexagonal nuts; when the hexagonal nuts are fastened, the raised edges of the external tooth locking washers are embedded into the contact surfaces of the mirror frame legs and the limiting door uprights; the upper end holes of the mirror frame legs are used to install the convex mirror, and the external tooth locking washers are installed between the thread hole end faces of the two sides of the convex mirror and the inner side surfaces of the mirror frame legs, and are fastened by spring washers and internal hexagonal screws; when the internal hexagonal screws are fastened, the raised edges of the external tooth locking washers are embedded into the thread hole end faces of the convex mirror and the side surfaces of the mirror frame legs; the positions and sizes of the limiting door uprights and the limiting door cross beam satisfy the following conditions: the 2# node shaft does not interfere with the limiting door uprights when it moves horizontally on the tray plane, and the 2# node shaft cannot interfere with the limiting door cross beam when it is raised.

[0014] Further, the middle hole of the mirror frame leg is installed with a mirror frame cross beam, and the mirror frame cross beam is fixedly connected with the mirror frame leg through spring washers and hexagonal nuts, so as to strengthen the stability and rigidity of the mirror frame leg.

[0015] By adopting the technical scheme, the application has the following beneficial effects:

[0016] The application increases the area of the hoop tray, avoids the interference between the connecting mechanism and the limiting door, and enables personnel on the ring beam horse path to observe the working condition of the 2# node shaft on the hoop tray, thereby greatly reducing the daily inspection workload of maintenance personnel and ensuring the safety of the high-altitude operation maintenance personnel. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the specific embodiments or prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description, and obviously, the drawings in the following description are some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0018] Figure 1 A FAST reflector edge unit connecting mechanism support and observation device schematic diagram is provided for the application.

[0019] Figure 2 A FAST reflector edge unit connecting mechanism support and observation device optical path schematic diagram is provided for the application.

[0020] Figure 3 A FAST reflector edge unit connecting mechanism support and observation device mirror component diagram is provided for the application.

[0021] Figure 4 A FAST reflector edge unit lower hoop tray and 2# connecting mechanism translational region schematic diagram is provided for the application.

[0022] Figure 5 A FAST reflector edge unit 2# node shaft lower hoop tray 2# connecting mechanism lifting schematic diagram is provided for the application.

[0023] Figure 6 A FAST reflector edge unit ring beam, horse path, etc. axonometric view is provided for the application.

[0024] Figure 7 A FAST prototype device edge reflector 2# node shaft tray axonometric view is provided for the application.

[0025] Icon: 1—upper hoop; 2—bolt pair; 3—lower hoop; 4—limiting door stand column; 5—limiting door cross beam; 6—mirror frame leg; 7—convex mirror; 8—hexagonal socket screw; 9—external tooth locking washer; 10—elastic washer; 11—hexagonal nut; 12—mirror frame cross bar; 13—flat washer; 14—ring beam lattice column; 15—2# node shaft; 16—quadrilateral panel unit; 17—mirror assembly; 18—personnel observation light path; 19—hoop assembly; 20—ring beam; 21—maintenance personnel; 22—ring beam horse path; 23—lower cross pipe; 24—connecting mechanism moving range; 25—tray; 26—limiting door. DETAILED DESCRIPTION

[0026] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0027] In conjunction with Figures 1-6 The embodiment shown provides a FAST reflecting surface edge unit connecting mechanism support and observation device, which comprises a hoop assembly 19 and a mirror assembly 17; wherein,

[0028] The hoop assembly 19 is installed on the lower cross pipe 23 of the FAST reflecting surface ring beam 20 and is used to support the 2# node shaft 15 of the quadrilateral panel unit 16 at the edge of the FAST reflecting surface; the mirror assembly 17 is installed on the tray 25 of the lower hoop 3 in the hoop assembly, and the maintenance personnel 21 passes through the FAST reflecting surface ring beam node disc and the 2# connecting mechanism working condition on the node disc in the convex mirror 7 of the mirror assembly 17 on the ring beam horse path 22 (supported on the ring beam lattice column 14) to judge whether the 2# node shaft is in a healthy working state (the specific observation path is the personnel observation light path 18 in the convex mirror 7 of the mirror assembly 17). Figure 2

[0029] In this embodiment, the hoop assembly 19 comprises an upper hoop 1, a lower hoop 3 and a bolt pair 2; the upper hoop 1 and the lower hoop 3 are fixedly connected through the bolt pair 2; the lower hoop 2 is welded with the tray 25, the tray 25 is used to support the 2# node shaft 15, and the 2# node shaft 15 is fixedly connected with the quadrilateral reflecting unit 16.

[0030] ​In this embodiment, the mirror assembly comprises two limit door uprights 4, a limit door crossbeam 5, two mirror frame legs 6 and a convex mirror 7; the lower ends of the two limit door uprights 4 are fixedly installed on the two sides of the tray 25 through flat washers 13, elastic washers 10 and hexagonal nuts 11 respectively; the lower end holes of the mirror frame legs 6 are fixedly connected with the limit door uprights 4 and the limit door crossbeam 5 through external tooth locking washers 9, elastic washers 10 and hexagonal nuts 11; when the hexagonal nuts 11 are fastened, the raised edges of the external tooth locking washers 9 are embedded into the contact surfaces between the mirror frame legs 6 and the limit door uprights 4, so that Figure 3 the angle α shown is fixedly unchanged; the upper end holes of the mirror frame legs 6 are used for installing the convex mirror 7, and external tooth locking washers 9 are installed between the threaded hole end faces on the two sides of the convex mirror 7 and the inner side surfaces of the mirror frame legs 6, and the fastening connection is achieved through spring washers 10 and internal hexagonal screws 8; when the internal hexagonal screws 8 are fastened, the raised edges of the external tooth locking washers 9 are embedded into the threaded hole end faces of the convex mirror 7 and the side surfaces of the mirror frame legs, so that Figure 3 the angle β shown is fixedly unchanged. During on-site installation, the angle α and the angle β are adjusted to make the observation angle of the convex mirror be in the best state. Figure 3 The positions and sizes of the limit door uprights 4 and the limit door crossbeam 5 satisfy the following conditions: the 2#node shaft 15 does not interfere with the limit door uprights 4 when it moves on the tray plane, and the 2#node shaft 15 cannot interfere with the limit door crossbeam 5 when it is raised.

[0031] In this embodiment, the middle hole of the mirror frame leg 6 is installed with a mirror frame crossbar 12, and the mirror frame crossbar 12 is fixedly connected with the mirror frame leg 6 through spring washers 10 and hexagonal nuts 11, so as to strengthen the stability and rigidity of the mirror frame leg 6.

[0032] In combination with Figure 7 shown, the FAST prototype device is to limit the movement range of the 2#node shaft 15 by setting the limit door 26 on the tray 25. The tray 25 of the lower hoop 3 is enlarged in the application (the sizes A, B and C in Figure 4 are enlarged) so as to adapt to the movement range of the 2#node shaft 15, so that the 2#node shaft does not interfere with the limit door uprights 4 when it moves on the tray plane. At the same time, the height of the limit door crossbeam 5 is increased, and the 2#node shaft 15 cannot interfere with the limit door crossbeam 5 when it is raised, thereby avoiding damage to the reflecting surface unit. It can be known from Figure 7 that the space of the 2#node shaft 15 when moving on the tray 25 and being raised in the FAST prototype device is smaller than the movement space sizes A, B, C and D of the application.

[0033] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A support and observation device for the edge unit connection mechanism of a FAST reflector surface, characterized in that, include: Clamp assembly and reflector assembly; among which, The clamp assembly is installed on the lower horizontal tube of the FAST reflector ring beam to support the No. 2 node shaft of the quadrilateral panel unit at the edge of the FAST reflector. The reflector assembly is installed on the tray of the lower clamp in the clamp assembly. Maintenance personnel can observe the working condition of the node plate at the FAST reflector ring beam and the No. 2 connecting mechanism on the node plate in the convex reflector of the reflector assembly on the ring beam walkway to determine whether the No. 2 node shaft is in good working condition. The clamp assembly includes an upper clamp, a lower clamp, and a bolt pair; the upper clamp and the lower clamp are fixedly connected by the bolt pair; the tray is welded onto the lower clamp, and the tray is used to support the No. 2 node shaft, which is fixedly connected to the quadrilateral reflection unit. The reflector assembly includes two limiting door posts, a limiting door beam, two mirror frame legs, and a convex reflector. The lower ends of the two limiting door posts are fixedly installed on both sides of the tray using flat washers, elastic washers, and hexagonal nuts. The lower end holes of the mirror frame legs are fixedly connected to the limiting door posts and the limiting door beam using external toothed locking washers, elastic washers, and hexagonal nuts. When the hexagonal nuts are tightened, the raised edge of the external toothed locking washer is embedded in the contact surface between the mirror frame leg and the limiting door post. The upper end holes of the mirror frame legs are used for... The convex reflector is installed, and external toothed locking washers are installed between the threaded hole end faces of the two sides of the convex reflector and the inner side of the mirror frame leg. The connection is fastened by spring washers and internal hex screws. When the internal hex screws are tightened, the raised edge of the external toothed locking washer is embedded in the threaded hole end face of the convex reflector and the side of the mirror frame leg. The position and size of the limit door column and the limit door beam meet the following conditions: the 2# node shaft does not interfere with the limit door column when it translates on the tray plane, and the 2# node shaft does not interfere with the limit door beam when it is raised. A crossbar is installed in the middle hole of the frame leg. The crossbar is fixedly connected to the frame leg by a spring washer and a hexagonal nut to enhance the stability and rigidity of the frame leg.

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