CN108832306B - Flexible plugging structure for center hole of FAST reflecting surface - Google Patents
Flexible plugging structure for center hole of FAST reflecting surface Download PDFInfo
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- CN108832306B CN108832306B CN201810605938.4A CN201810605938A CN108832306B CN 108832306 B CN108832306 B CN 108832306B CN 201810605938 A CN201810605938 A CN 201810605938A CN 108832306 B CN108832306 B CN 108832306B
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 117
- 239000010959 steel Substances 0.000 claims abstract description 117
- 230000000903 blocking effect Effects 0.000 claims description 16
- 238000003032 molecular docking Methods 0.000 claims description 10
- 239000004677 Nylon Substances 0.000 claims description 7
- 229920001778 nylon Polymers 0.000 claims description 7
- 239000000853 adhesive Substances 0.000 claims description 4
- 230000001070 adhesive effect Effects 0.000 claims description 4
- 238000012423 maintenance Methods 0.000 abstract description 2
- 230000007246 mechanism Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/14—Reflecting surfaces; Equivalent structures
- H01Q15/16—Reflecting surfaces; Equivalent structures curved in two dimensions, e.g. paraboloidal
- H01Q15/161—Collapsible reflectors
- H01Q15/162—Collapsible reflectors composed of a plurality of rigid panels
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Abstract
The application relates to a flexible plugging structure for a center hole of a FAST reflecting surface, which can meet the requirements of FAST observation working conditions and maintenance working conditions. The structure comprises: the vertical face plugging device comprises 5 reflection panel vertical face plugging units, 4 trapezoid-like steel mesh units, 1 trapezoid-like steel mesh unit at a ladder, 1 flexible cover of the steel mesh unit at the ladder, 1 central round steel mesh unit and accessory connectors; the plugging structure does not need to descend the inner ring guardrail and the outer ring guardrail of the cabin stopping platform, does not need to descend 3 sets of lifting columns, does not need to be dismantled from the trapezoid plugging structure of the outer ring of the cabin stopping platform, and can be detached only by detaching the round steel mesh unit at the center when the feed cabin enters the port, so that the time and the labor amount of dismantling the plugging structure, descending the 3 sets of lifting columns of the cabin stopping platform and descending the inner ring guardrail are greatly reduced.
Description
Technical Field
The application relates to a flexible plugging structure for a center hole of a FAST reflecting surface, which is completely manually operated in installation and disassembly and can meet the requirements of FAST observation working conditions and maintenance working conditions.
Background
500m caliber spherical radio telescope (Five-handred-meter Aperture Spherical radio Telescope, FAST) is the largest single caliber radio astronomical telescope worldwide, with three independent innovations: using natural karst pits in Guizhou as addresses; actively deforming the reflective surface; and a flexible light mechanism dragged by six cables in parallel is adopted to drag the feed cabin to realize one-time cable driving, and meanwhile, the feed is supported.
The FAST reflecting surface is a cable net woven into a flexible triangular grid by steel cables, 4450 triangular aluminum alloy reflecting surface units with the side length of about 11m are arranged on the FAST reflecting surface, and 2225 cable net nodes are connected with a hydraulic actuator arranged on the ground by lower cables. In the observation working condition, due to the rotation motion of the earth, the incident angle of the radio wave can synchronously change along with the east and west falling of the celestial body. In order to meet the changing requirement, the FAST drives the down-stay cable and the cable net node to move radially through the actuator, so that the 300-meter-caliber reflecting surface is actively deformed, an instantaneous paraboloid is formed by the spherical surface, the paraboloid is ensured to always point to a celestial body to be observed, and radio wave signals from the celestial body are focused. At the same time, the feed receiver at the focal position receives and processes the radio wave signal, and the process is continuous.
6 feed source supporting towers with the diameter of more than hundred meters are uniformly distributed on the circumference of the outer edge of the reflecting surface, each tower is supported with a steel wire rope with the diameter of 46mm, each steel wire rope is driven by a driving winch at the bottom of each tower, the steel wire ropes are reliably connected with the feed source cabin through a ground guide pulley, a tower center rope channel and a tower top guide pulley mechanism, and the 6 steel wire ropes move in parallel to drag the feed source cabin to perform initial positioning of astronomical tracking observation tracks.
The feed cabin is main equipment for bearing the feed receiver and further finely adjusting and controlling the pose of the feed receiver, and mainly comprises a star frame, an AB axis mechanism, a Stewart platform, a multi-beam receiver steering device, a cabin cover, other accessory equipment/facilities and the like. The overall dimensions of the feed deck are 13 meters in diameter and 6 meters in height, weighing about 30 tons.
A set of photoelectric integrated cabin parking platform equipment is built at the bottom center of the FAST reflecting surface and is used for overhauling and maintaining a feed cabin and the like. The cabin berthing platform is in a storage state in a FAST observation state, the height of the cabin berthing platform is less than or equal to 3.5 meters, and the horizontal projection of the cabin berthing platform is in a circle with the diameter of 16 meters. When the cabin enters the port for overhauling and maintaining, the cabin berthing platform is lifted to 5.02 meters by the lifting upright post of the feed cabin, so that the interference between the 6-cable and cable cabin entering mechanism and the reflecting surface unit is avoided.
In order to facilitate the construction of the feed cabin and the entrance and stop of the feed cabin, a regular pentagonal hole with an inscribed circle diameter of 16.8 meters is reserved in the center of the bottom of the reflecting surface, and a foundation round table with a diameter of 26 meters is built below the hole. When the FAST is observed, the feed cabin leaves the port, and the regular pentagonal hole is required to be plugged, so that noise generated by ground heat radiation is effectively shielded. When the feed cabin enters the port to stop, the plugging structure, the mechanism and the like for covering the regular pentagonal holes are required to be removed.
When the FAST reflecting surface actively deforms, the regular pentagon in the center of the cable net generates side deflection amounts in the horizontal projection plane along the axial direction of the cable and the axial direction of the vertical cable respectively, the maximum side deflection amount is 140mm, meanwhile, the height of the 5 sets of joint plates can be changed, and the variation is +/-500 mm. The plugging structure and the plugging mechanism of the regular pentagonal hole at the center meet the deformation requirement of the reflecting surface.
The application relates to a flexible plugging structure for a central hole of a FAST reflecting surface, which is required to meet the plugging and dismantling functions of a central regular pentagonal hole, can adapt to the deformation requirements of various working conditions of the reflecting surface, is simple and reliable to operate when the structure is assembled and disassembled, and cannot interfere with a 6 cable and cable in-cabin mechanism of an adjacent reflecting panel, a cable net, a cabin docking platform, a feed cabin and a dragging feed cabin.
The information disclosed in this background section is only for enhancement of understanding of the general background of the application 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.
Disclosure of Invention
The application aims to provide a flexible blocking structure for a center hole of a FAST reflecting surface, so as to solve the technical problems in the prior art.
In order to achieve the above purpose, the present application adopts the following technical scheme:
the application adopts a flexible blocking structure of a center hole of a FAST reflecting surface, which comprises the following steps: the device comprises 5 reflection panel elevation plugging units, 4 trapezoid-like steel mesh units, 1 trapezoid-like steel mesh unit at the step, 1 flexible cover of the steel mesh unit at the step and 1 central round steel mesh unit; wherein,,
the 5 reflection panel elevation blocking units are in one-to-one correspondence with five sides of a FAST reflection surface center pentagon hole, the upper ends of the reflection panel elevation blocking units are fixedly connected with the reflection panel at the edge of the FAST reflection surface center pentagon hole, and the lower ends of the reflection panel elevation blocking units are free ends, extend to the rear of a main rope at the edge of the FAST reflection surface center hole and are in lap joint with the main rope;
the 4 trapezoid-like steel net units are connected with the main ropes at the edges of the regular pentagon holes in the center of the FAST reflecting surface at the long and straight top edges of the trapezoid-like steel net units at the ladder-moving position, and the circular arc bottom edges are connected with the outer ring guardrails at the ring beam platform of the FAST cabin parking platform device;
the ladder-like steel mesh unit at the ladder position is provided with an opening for workers to go up and down the ladder platform at the ladder-like platform of the ring beam platform of the FAST cabin parking platform device, and the flexible cover of the steel mesh unit at the ladder position covers the opening; the flexible cover of the steel mesh unit at the walking ladder is connected with the adjacent edge of the trapezoid-like steel mesh unit at the walking ladder in an adhesive manner, and the connection part of the flexible cover of the steel mesh unit at the walking ladder and the guardrail of the walking ladder platform is detachably connected through a hook;
the central circular steel mesh unit covers the central hole of the ring beam platform of the FAST cabin berthing platform and is detachably connected with the inner guardrail vertical pipe of the FAST cabin berthing platform through a hook.
As a further technical scheme, the junction of the reflecting panel and the reflecting panel elevation blocking unit is punched with a small hole of 5mm, and the upper ends of the reflecting panel and the reflecting panel elevation blocking unit are fixedly connected through cotter pins and flat washers.
As a further technical scheme, the trapezoid-like steel mesh units and the long straight top edges of the trapezoid-like steel mesh units at the ladder-like positions are uniformly and fixedly provided with a plurality of nylon belts, and the trapezoid-like steel mesh units and the long straight top edges of the trapezoid-like steel mesh units at the ladder-like positions are connected with main ropes at the edges of the regular pentagon holes in the centers of the FAST reflecting surfaces through the nylon belts.
As a further technical scheme, the trapezoid-like steel mesh unit and the arc bottom edge of the trapezoid-like steel mesh unit at the ladder walking position are connected with the outer ring guardrail and the ladder walking platform guardrail at the ring beam platform of the FAST cabin parking platform device through double hooks.
As a further technical scheme, walk the flexible lid of ladder department steel mesh unit with walk the junction of ladder department trapezoidal steel mesh unit and be provided with the magic subsides, the two passes through the magic is pasted bonding connection.
As a further technical scheme, the central circular steel mesh unit is detachably connected with the inner guardrail riser of the FAST cabin docking platform through a single hook; a steel wire rope with the diameter of 5mm is sewn in the circumferential edge of the central circular steel mesh unit; after being hooked on the steel wire rope, the single hook is hung on an inner guardrail vertical pipe of the FAST cabin docking platform.
As a further technical scheme, the trapezoid-like steel mesh unit and the trapezoid-like steel mesh unit at the ladder place are provided with reserved quantity in the height direction, namely: the height is larger than the actual height of the position to be plugged in the reset state.
As a further technical solution, the reserved quantity is 0.5 meter.
As a further technical scheme, the central circular steel mesh unit is reserved with a certain reserved amount in the diameter direction, namely: the diameter of the ring beam platform is larger than that of the central hole of the ring beam platform of the FAST deck docking platform.
As a further technical scheme, the reserved quantity is not less than 0.6 meter.
By adopting the technical scheme, the application has the following beneficial effects:
the plugging structure does not need to descend the inner ring guardrail and the outer ring guardrail of the cabin stopping platform, does not need to descend 3 sets of lifting columns, does not need to be dismantled from the trapezoid plugging structure of the outer ring of the cabin stopping platform, and can be detached only by detaching the round steel mesh unit at the center when the feed cabin enters the port, so that the time and the labor amount of dismantling the plugging structure, descending the 3 sets of lifting columns of the cabin stopping platform and descending the inner ring guardrail are greatly reduced.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following description will briefly explain the drawings needed in the embodiments or the prior art, and it is obvious that the drawings in the following description are some embodiments of the present application and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the overall structure of a flexible plugging structure in a plugging state;
FIG. 2 is a schematic structural view of a center hole of a FAST reflecting surface in an unblocked state;
FIG. 3 is a schematic structural view of a trapezoid-like steel mesh unit provided by the application;
fig. 4 is a schematic structural view of a ladder-like steel mesh unit at a ladder place provided by the application;
fig. 5 is a schematic structural view of a flexible cover of a steel mesh unit at a ladder of the application;
FIG. 6 is a schematic diagram of the connection structure of the upper end of the vertical plugging unit of the reflective panel, the trapezoid-like steel mesh unit, the long straight top edge of the trapezoid-like steel mesh unit at the ladder and the main rope at the edge of the regular pentagon hole in the center of the FAST reflective surface;
FIG. 7 is a schematic diagram of a connection structure of a reflection panel and an upper end of a vertical plugging unit of the reflection panel, which are fixedly connected through cotter pins and flat washers;
fig. 8 is a schematic diagram of a connection structure between a trapezoid-like steel mesh unit and a circular arc bottom edge of the trapezoid-like steel mesh unit at a ladder walking position and an outer ring guardrail and a ladder walking platform guardrail at a ring beam platform of a FAST cabin parking platform device;
FIG. 9 is a schematic diagram of a connection structure of a central circular steel mesh unit provided by the application detachably connected with an inner guardrail riser of a FAST cabin docking platform through a single hook;
FIG. 10 is a schematic view of a single hook structure according to the present application;
FIG. 11 is a schematic view of a double hook structure provided by the present application;
icon: 1-a reflection panel elevation plugging unit; 2-trapezoid-like steel mesh units; 3-ladder-like steel net units at the ladder-walking position; 4-a steel mesh unit flexible cover at the ladder; 5-a central round steel mesh unit; a 6-reflecting panel; 7-main rope; 8-cotter pins; 9-plain washers; 10-nylon belt; 11-double hooks; 12-magic tape; 13-single hook.
Detailed Description
The following description of the embodiments of the present application will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the application are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The following describes specific embodiments of the present application in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the application, are not intended to limit the application.
Referring to fig. 1 to 11, the present application provides a flexible plugging structure for a central hole of a FAST reflecting surface, including: the vertical face plugging units 1, 4 trapezoid-like steel mesh units 2, 1 trapezoid-like steel mesh unit 3 at the step, 1 flexible cover 4 of the steel mesh unit at the step and 1 central round steel mesh unit 5 of the reflecting panel; wherein,,
the 5 reflection panel elevation blocking units 1 are in one-to-one correspondence with five sides of a FAST reflection surface center pentagon hole, the upper ends of the reflection panel elevation blocking units 1 are fixedly connected with a reflection panel 6 at the edge of the FAST reflection surface center pentagon hole, the lower ends of the reflection panel elevation blocking units 1 are free ends, and the free ends extend to the rear of a main rope 7 at the FAST reflection surface center hole edge and are overlapped with the main rope 7; the 5 reflection panel elevation blocking units are used for blocking gaps from the reflection panel to the main rope and blocking ground thermal noise. According to the structure, the steel mesh is covered on the reflecting panel at the edge of the regular pentagon hole, the reflecting panel is made of aluminum alloy plates with the thickness of 1mm, small holes with the thickness of 5mm are punched on the reflecting panel, and the hole density meets the requirement that the reflecting panel has 50% of light transmittance. The steel mesh for plugging is connected with the panel by using a plurality of 5mm holes, cotter pins and flat washers.
The 4 trapezoid-like steel mesh units 2 and the long straight top edges of the trapezoid-like steel mesh units 3 at the ladder-moving positions are connected with a main rope 7 at the edge of a regular pentagon hole in the center of the FAST reflecting surface, and the circular arc bottom edges are connected with an outer ring guardrail at the ring beam platform of the FAST cabin berthing platform device and a ladder-moving platform guardrail;
the ladder-like steel mesh unit 3 at the ladder position is provided with an opening for workers to go up and down the ladder platform at the ladder-like platform of the ring beam platform of the FAST cabin berthing platform equipment, and the flexible cover 4 of the steel mesh unit at the ladder position covers the opening; the flexible cover 4 of the steel mesh unit at the walking ladder is connected with the adjacent edge of the trapezoid-like steel mesh unit at the walking ladder in an adhesive manner, and the connection part of the flexible cover 4 of the steel mesh unit at the walking ladder and the guardrail of the walking ladder platform is detachably connected through a hook; in the application, the 4 trapezoid steel mesh units and the 1 trapezoid steel mesh unit at the step are of trapezoid-like structures, but the step and the step platform are arranged at the steel mesh unit at the step, and a rectangular hole is formed at the step so as to facilitate the personnel to go up and down. The rectangular holes are covered by a steel net, so that people can conveniently remove and cover the rectangular holes when passing through the rectangular holes.
The central circular steel mesh unit 5 covers the central hole of the ring beam platform of the FAST cabin berthing platform and is detachably connected with the inner guardrail vertical pipe of the FAST cabin berthing platform.
As a further technical scheme, the junction of the reflecting panel 6 and the reflecting panel elevation plugging unit 1 is punched with a small hole of 5mm, and the upper ends of the reflecting panel 6 and the reflecting panel elevation plugging unit 1 are fixedly connected through cotter pins 8 and flat washers 9.
As a further technical scheme, the trapezoid-like steel mesh unit 2 and the long straight top edge of the trapezoid-like steel mesh unit 3 at the ladder position are uniformly and fixedly provided with a plurality of nylon belts 10, and the trapezoid-like steel mesh unit 2 and the long straight top edge of the trapezoid-like steel mesh unit 3 at the ladder position are connected with the main rope 7 at the edge of the regular pentagon hole in the center of the FAST reflecting surface through the nylon belts 10.
As a further technical scheme, the trapezoid-like steel mesh unit 2 and the arc bottom edge of the trapezoid-like steel mesh unit 3 at the ladder walking position are connected with an outer ring guardrail at the ring beam platform of the FAST cabin parking platform device through double hooks 11.
As a further technical scheme, the flexible cover 4 of the ladder-shaped steel mesh unit and the connecting part of the ladder-shaped steel mesh unit are provided with magic tapes 12, and the two are connected by bonding the magic tapes 12.
As a further technical scheme, the central circular steel mesh unit 5 is detachably connected with an inner guardrail riser of the FAST cabin parking platform through a single hook 13; a steel wire rope with the diameter of 5mm is sewn in the circumferential edge of the central circular steel mesh unit 5; after being hooked on the steel wire rope, the single hook 13 is hung on an inner guardrail vertical pipe of the FAST cabin docking platform. When the feed cabin enters the port to stop, only the round steel mesh plugging unit is removed. The plugging structure of the ring beam platform outer ring of the FAST cabin docking platform is not required to be disassembled.
As a further technical scheme, the trapezoid-like steel mesh unit 2 and the trapezoid-like steel mesh unit 3 at the ladder place are provided with a reserved amount in the height direction, namely: the height is larger than the actual height of the position to be plugged in the reset state. Preferably, the reserve is 0.5 meters. The reserved quantity is set to adapt to the position change of the main rope, because the guardrail at the ring beam platform is fixed, the main rope at the edge of the regular pentagon changes when the position of the FAST observes the working condition, and the trapezoidal plugging unit is not tensioned and damaged when the FAST observes the working condition by setting the reserved quantity to adapt to the position change of the main rope.
As a further technical solution, the central circular steel mesh unit 5 has a certain reserved amount in the diameter direction, namely: the diameter of the ring beam platform is larger than that of the central hole of the ring beam platform of the FAST deck docking platform. Preferably, the reserved quantity is not less than 0.6 meter. Inside the ring beam platform of the FAST cabin stop platform, a round hole with the diameter of 9.6 meters is formed, and the hole is plugged by a manufactured complete round steel mesh unit. The diameter of the round unit is larger than 9.6 meters, and a certain diameter reserved amount is reserved so as to adapt to the natural sagging of the steel mesh unit.
The application utilizes the ring beam platform and the guardrail of the FAST cabin berthing platform equipment, takes the upper surface plate of the ring beam platform of the cabin berthing platform equipment as a part of a plugging structure to participate in plugging, and takes the guardrail as a fixed connection supporting piece of a steel mesh plugging unit. The long bottom edges of the 4 trapezoid steel mesh units and the 1 trapezoid steel mesh units at the ladder walking position are connected with the edge main rope of the regular pentagon, and the arc edges are connected with the outer ring guard rail at the ring beam platform, the hooks for the ladder walking platform guard rail and the like. It has the following advantages:
the inner ring guardrail and the outer ring guardrail of the cabin stopping platform do not need to be lowered, 3 sets of lifting upright posts do not need to be lowered, the trapezoid plugging structure of the outer ring of the cabin stopping platform does not need to be removed, when the feed source cabin enters a port, only the round steel mesh unit at the center is required to be detached, and the time and the labor amount of detachment of the plugging structure, landing of the 3 sets of lifting upright posts of the cabin stopping platform and landing of the inner ring guardrail and the outer ring guardrail are greatly reduced.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.
Claims (10)
1. A FAST reflector centre bore flexible plugging structure, comprising: the device comprises 5 reflection panel elevation plugging units, 4 trapezoid-like steel mesh units, 1 trapezoid-like steel mesh unit at the step, 1 flexible cover of the steel mesh unit at the step and 1 central round steel mesh unit; wherein,,
the 5 reflection panel elevation blocking units are in one-to-one correspondence with five sides of a FAST reflection surface center pentagon hole, the upper ends of the reflection panel elevation blocking units are fixedly connected with the reflection panel at the edge of the FAST reflection surface center pentagon hole, and the lower ends of the reflection panel elevation blocking units are free ends, extend to the rear of a main rope at the edge of the FAST reflection surface center hole and are in lap joint with the main rope;
the 4 trapezoid-like steel net units are connected with the main ropes at the edges of the regular pentagon holes in the center of the FAST reflecting surface at the long and straight top edges of the trapezoid-like steel net units at the ladder-moving position, and the circular arc bottom edges are connected with the outer ring guardrails at the ring beam platform of the FAST cabin parking platform device;
the ladder-like steel mesh unit at the ladder position is provided with an opening for workers to go up and down the ladder platform at the ladder-like platform of the ring beam platform of the FAST cabin parking platform device, and the flexible cover of the steel mesh unit at the ladder position covers the opening; the flexible cover of the steel mesh unit at the walking ladder is connected with the adjacent edge of the trapezoid-like steel mesh unit at the walking ladder in an adhesive manner, and the connection part of the flexible cover of the steel mesh unit at the walking ladder and the guardrail of the walking ladder platform is detachably connected through a hook;
the central circular steel mesh unit covers the central hole of the ring beam platform of the FAST cabin berthing platform and is detachably connected with the inner guardrail vertical pipe of the FAST cabin berthing platform through a hook.
2. The flexible plugging structure for the center hole of the FAST reflecting surface according to claim 1, wherein a small hole with the diameter of 5mm is punched at the joint of the reflecting panel and the plugging unit for the vertical face of the reflecting panel, and the upper ends of the plugging unit for the vertical face of the reflecting panel and the reflecting panel are fixedly connected through cotter pins and flat washers.
3. The flexible plugging structure for the center hole of the FAST reflecting surface according to claim 1, wherein a plurality of nylon belts are uniformly and fixedly arranged on the long straight top edges of the trapezoid-like steel mesh units at the ladder-like position and the long straight top edges of the trapezoid-like steel mesh units at the ladder-like position, and the long straight top edges of the trapezoid-like steel mesh units at the ladder-like position are connected with a main rope at the edge of a regular pentagon hole in the center of the FAST reflecting surface through the nylon belts.
4. The flexible plugging structure for the center hole of the FAST reflecting surface according to claim 1, wherein the trapezoid-like steel mesh unit and the circular arc bottom edge of the trapezoid-like steel mesh unit at the step are connected with an outer ring guardrail and a step platform guardrail at a ring beam platform of the FAST cabin berthing platform equipment through double hooks.
5. The FAST reflection surface central hole flexible plugging structure according to claim 1, wherein a magic tape is arranged at the joint of the flexible cover of the steel mesh unit at the step and the trapezoid-like steel mesh unit at the step, and the flexible cover and the trapezoid-like steel mesh unit are connected through the magic tape in an adhesive mode.
6. The FAST reflection surface central hole flexible plugging structure according to claim 1, wherein the central circular steel mesh unit is detachably connected with an inner guardrail riser of a FAST cabin parking platform through a single hook; a steel wire rope with the diameter of 5mm is sewn in the circumferential edge of the central circular steel mesh unit; after being hooked on the steel wire rope, the single hook is hung on an inner guardrail vertical pipe of the FAST cabin docking platform.
7. The FAST reflection surface central hole flexible plugging structure according to claim 1, wherein the trapezoid-like steel mesh unit and the trapezoid-like steel mesh unit at the step are provided with a reserved amount in a height direction, namely: the height is larger than the actual height of the position to be plugged in the reset state.
8. The FAST reflector central hole flexible plugging structure according to claim 7, wherein said reserved amount is 0.5 meters.
9. The FAST reflector central hole flexible plugging structure according to claim 1, wherein the central circular steel mesh unit has a certain reserved amount in the diameter direction, namely: the diameter of the ring beam platform is larger than that of the central hole of the ring beam platform of the FAST deck docking platform.
10. The FAST reflector central hole flexible plugging structure according to claim 9, wherein said reserved amount is not less than 0.6 meter.
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| CN201810605938.4A CN108832306B (en) | 2018-06-13 | 2018-06-13 | Flexible plugging structure for center hole of FAST reflecting surface |
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| Title |
|---|
| 大射电望远镜面板开合机构传动装置的设计;高思齐;古学东;郭永卫;赵保庆;王启明;王自勤;石伟朝;;机械设计(05);全文 * |
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| CN108832306A (en) | 2018-11-16 |
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