CN108832306B - A flexible sealing structure for the center hole of FAST reflective surface - Google Patents

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

A flexible sealing structure for the center hole of FAST reflective surface

Technical field

The invention relates to a flexible sealing structure for the center hole of a FAST reflective surface. The installation and disassembly of the structure are completely manual operations, which can meet the needs of FAST observation working conditions and maintenance working conditions.

Background technique

The Five-hundred-meter Aperture Spherical Radio Telescope (FAST) is the world's largest single-aperture radio astronomical telescope. It has three independent innovations: using Guizhou's natural karst depressions as the site; actively deforming reflectors; A flexible lightweight mechanism with six parallel cables is used to drag the feed cabin to achieve primary cable drive and simultaneous feed support.

The FAST reflective surface is a cable net woven into a flexible triangular grid with steel cables. 4,450 triangular aluminum alloy reflector units with a side length of about 11 meters are installed on it. Down cables and hydraulic pressure units installed on the ground are used on 2,225 cable net nodes. Actuator connection. During observation conditions, due to the earth's rotation, the incident angle of radio waves will change synchronously as celestial bodies rise in the east and set in the west. In order to meet this changing requirement, FAST uses actuators to drive the radial movement of the cable and cable network nodes to actively deform the 300-meter-diameter reflecting surface and form an instant parabola from the spherical surface, ensuring that the parabola always points to the celestial body that needs to be observed, and will Radio wave signals from celestial bodies are focused. At the same time, the feed receiver at the focus position receives the radio wave signal and processes it. This process is continuous.

Six feed support towers more than 100 meters high are evenly distributed on the 600-meter-diameter circumference of the outer edge of the reflective surface. Each tower supports a 46mm diameter steel wire rope. Each steel wire rope is driven by a driving winch at the bottom of each tower and passes through the ground. The guide pulley, tower center cable channel, and tower top guide pulley mechanism are reliably connected to the feed cabin. Six wire ropes move in parallel, dragging the feed cabin for preliminary positioning of astronomical tracking and observation trajectories.

The feed cabin is the main equipment that carries the feed receiver and further fine-tunes its posture. It mainly includes a star frame, AB axis mechanism, Stewart platform, multi-beam receiver steering device, cabin cover and other ancillary equipment. /Facilities etc. The overall size of the feed cabin is 13 meters in diameter, 6 meters high, and weighs about 30 tons.

A set of photoelectrically integrated cabin docking platform equipment was built at the center of the bottom of the FAST reflective surface for maintenance and repair of the feed cabin. The cabin docking platform is in the stowed state in the FAST observation state, its height is less than or equal to 3.5 meters, and its horizontal projection is within a circle with a diameter of 16 meters. When the cabin enters the port for inspection and maintenance, the lifting column of the cabin docking platform that receives the feed cabin is raised to 5.02 meters to avoid interference between the 6-wire and cable entry mechanism and the reflective surface unit.

In order to facilitate the construction of the feed cabin and docking in the port, a regular pentagonal hole with an inscribed circle diameter of 16.8 meters is left at the center of the bottom of the reflecting surface, and a basic circular cone with a diameter of 26 meters is built below the hole. When the feed cabin leaves the port during FAST observation, the regular pentagonal hole needs to be blocked to effectively shield the noise generated by ground thermal radiation. When the feed cabin docks in port, the blocking structures and mechanisms covering the regular pentagonal holes need to be removed.

When the FAST reflective surface is actively deformed, the regular pentagon in the center of the cable net will generate side deflections in the two directions of the cable axial direction and the vertical steel cable axis in the horizontal projection plane. The maximum side deflection is 140mm. At the same time, The height of the 5 sets of node disks will change by ±500mm. The blocking structure and mechanism of the regular pentagonal hole in the center should meet the reflective surface deformation requirements.

The invention relates to a flexible blocking structure for the center hole of a FAST reflective surface. The blocking structure must meet the functions of blocking and dismantling the central regular pentagonal hole, be able to adapt to the deformation requirements of various working conditions of the reflective surface, and realize operations during assembly and disassembly of the structure. It is simple and reliable, and cannot interfere with the adjacent reflective panel, cable net, cabin docking platform, feed cabin, 6 cables that drag the feed cabin and the cable entry mechanism.

The information disclosed in this Background section is merely intended to enhance an understanding of the general background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art that is already known to those skilled in the art.

Contents of the invention

The purpose of the present invention is to provide a flexible blocking structure for the center hole of a FAST reflective surface to solve the technical problems existing in the prior art.

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

The invention adopts a FAST reflective surface center hole flexible sealing structure, which includes: 5 reflective panel facade sealing units, 4 trapezoidal steel mesh units, 1 trapezoidal steel mesh unit at the staircase, and 1 staircase. A flexible cover of the steel mesh unit and a central circular steel mesh unit; among which,

The five reflective panel facade sealing units are in one-to-one correspondence with the five sides of the pentagonal hole in the center of the FAST reflective surface. The upper end of the reflective panel facade sealing unit is fixed to the reflective panel at the edge of the pentagonal hole in the center of the FAST reflective surface. Connection, the lower end of the reflective panel facade sealing unit is the free end, which extends to the back of the main cable at the edge of the center hole of the FAST reflective surface, and overlaps with the main cable;

The four trapezoid-like steel mesh units and the long straight top edges of the trapezoid-like steel mesh units at the stairs are connected to the main cables at the edge of the regular pentagonal hole in the center of the FAST reflective surface, and the arc bottom edge is connected to the FAST cabin docking platform. The outer ring guardrail at the ring beam platform of the equipment and the guardrail on the ladder platform are connected;

The ladder-shaped steel mesh unit at the stairway is provided with an opening for workers to get up and down the stairway platform at the stairway platform of the ring beam platform of the FAST cabin docking platform equipment. The steel mesh unit at the stairway is covered with a flexible cover. At the above-mentioned opening; the flexible cover of the steel mesh unit at the staircase is bonded to the adjacent sides of the trapezoidal steel mesh unit at the staircase, and the connection between the flexible cover of the steel mesh unit at the staircase and the guardrail of the staircase 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 docking platform, and is detachably connected to the inner guardrail riser of the FAST cabin docking platform through hooks.

As a further technical solution, a 5mm hole is punched at the connection between the reflective panel and the reflective panel facade sealing unit, and the upper ends of the reflective panel and the reflective panel facade sealing unit are fixed through cotter pins and flat washers. connect.

As a further technical solution, several nylon belts are evenly fixed on the long straight top edges of the trapezoid-like steel mesh units and the ladder-like steel mesh units at the stairs. The long straight top edge of the trapezoidal steel mesh unit at the ladder is connected to the main cable at the edge of the regular pentagonal hole in the center of the FAST reflective surface through the nylon strap.

As a further technical solution, the arc bottom edge of the trapezoid-like steel mesh unit and the trapezoid-like steel mesh unit at the ladder is connected through double hooks with the outer ring guardrail at the ring beam platform of the FAST cabin docking platform equipment and the walkway. Ladder platform guardrail connection.

As a further technical solution, a Velcro is provided at the connection between the flexible cover of the steel mesh unit at the stairway and the trapezoidal steel mesh unit at the stairway, and the two are adhesively connected through the Velcro.

As a further technical solution, the central circular steel mesh unit is detachably connected to the inner guardrail riser of the FAST cabin docking platform through a single hook; a 5mm diameter pipe is sewn into the circumferential edge of the central circular steel mesh unit. The steel wire rope; after the single hook is hooked on the steel wire rope, it is hung on the inner guardrail riser of the FAST cabin docking platform.

As a further technical solution, the trapezoidal steel mesh unit and the trapezoidal steel mesh unit at the stairway are provided with a reserve amount in the height direction, that is, its height is greater than its desired blocking position in the reset state. actual height.

As a further technical solution, the reserved amount is 0.5 meters.

As a further technical solution, the central circular steel mesh unit leaves a certain reserve in the diameter direction, that is, its diameter is larger than the diameter of the central hole of the ring beam platform of the FAST cabin docking platform.

As a further technical solution, the reserved amount is not less than 0.6 meters.

Adopting the above technical solution, the present invention has the following beneficial effects:

This blocking structure does not require lowering the inner and outer ring guardrails of the cabin docking platform, and does not require lowering three sets of lifting columns. The trapezoidal blocking structure on the outer ring of the cabin docking platform does not need to be dismantled. When the feed cabin enters the port, only the central round steel ring needs to be dismantled. The net unit is enough, which greatly reduces the time and labor required for dismantling the blocking structure, lowering the three sets of lifting columns on the cabin docking platform, and lowering the inner and outer ring guardrails.

Description of drawings

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

Figure 1 is a schematic diagram of the overall structure of the flexible blocking structure provided by the present invention in a blocking state;

Figure 2 is a schematic structural diagram of the center hole of the FAST reflective surface in an unblocked state;

Figure 3 is a schematic structural diagram of the trapezoidal steel mesh unit provided by the present invention;

Figure 4 is a schematic structural diagram of the trapezoidal steel mesh unit at the stairwell provided by the present invention;

Figure 5 is a schematic structural diagram of the flexible cover of the steel mesh unit at the staircase provided by the present invention;

Figure 6 shows the upper end of the reflective panel facade sealing unit and the reflective panel provided by the present invention, as well as the trapezoidal steel mesh unit, the long straight top edge of the trapezoidal steel mesh unit at the staircase and the regular pentagonal hole in the center of the FAST reflective surface. Schematic diagram of the connection structure of the main cable at the edge;

Figure 7 is a schematic diagram of the connection structure in which the upper ends of the reflective panel and the reflective panel facade sealing unit provided by the present invention are fixedly connected through cotter pins and flat washers;

Figure 8 shows the connection between the trapezoidal steel mesh unit provided by the present invention and the arc bottom edge of the trapezoidal steel mesh unit at the stairway and the outer ring guardrail at the ring beam platform of the FAST cabin docking platform equipment and the stairway platform guardrail. Schematic;

Figure 9 is a schematic diagram of the connection structure in which the central circular steel mesh unit provided by the present invention is detachably connected to the inner guardrail riser of the FAST cabin docking platform through a single hook;

Figure 10 is a schematic structural diagram of the single hook provided by the present invention;

Figure 11 is a schematic structural diagram of the double hook provided by the present invention;

Icon: 1-reflective panel facade sealing unit; 2-trapezoidal steel mesh unit; 3-trapezoidal steel mesh unit at stairs; 4-flexible cover of steel mesh unit at stairs; 5-center circular steel mesh unit ; 6-Reflective panel; 7-Main cable; 8-Cotter pin; 9-Flat washer; 10-Nylon strap; 11-Double hook; 12-Velcro; 13-Single hook.

Detailed ways

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

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 here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

As shown in Figures 1 to 11, this application provides a flexible sealing structure for the center hole of a FAST reflective surface, including: 5 reflective panel facade sealing units 1, 4 trapezoidal steel mesh units 2, and 1 walking A trapezoidal steel mesh unit 3 at the ladder, a flexible cover 4 for the steel mesh unit at the staircase, and a central circular steel mesh unit 5; among them,

The five reflective panel facade sealing units 1 are in one-to-one correspondence with the five sides of the pentagonal hole in the center of the FAST reflective surface. The panel 6 is fixedly connected, and the lower end of the reflective panel facade sealing unit 1 is the free end, which extends to the back of the main cable 7 at the edge of the center hole of the FAST reflective surface, and overlaps with the main cable 7; 5 reflective panel facade sealing units It is to seal the gap from the reflective panel to the main cable and block the ground thermal noise here. This structure covers the steel mesh on the reflective panel at the edge of the regular pentagonal hole. The reflective panel is made of a 1mm thick aluminum alloy plate. The plate is punched with 5mm holes. The density of the holes is such that the plate can transmit 50% of the light. Rate. Use some 5mm holes, cotter pins, and flat washers to connect the blocking steel mesh to the panel.

The long straight top edges of the four trapezoidal steel mesh units 2 and the trapezoidal steel mesh unit 3 at the staircase are connected to the main cable 7 at the edge of the regular pentagonal hole in the center of the FAST reflective surface, and the arc bottom edge is connected to the FAST The outer ring guardrail at the ring beam platform of the cabin docking platform equipment and the guardrail on the ladder platform are connected;

The ladder-shaped steel mesh unit 3 at the stairway is provided with an opening for workers to get up and down the stairway platform at the stairway platform of the ring beam platform of the FAST cabin docking platform equipment, and the steel mesh unit at the stairway is covered by a flexible cover 4 At the opening; the flexible cover 4 of the steel mesh unit at the staircase is bonded to the adjacent sides of the trapezoidal steel mesh unit at the staircase, and the connection between the flexible cover 4 of the steel mesh unit at the staircase and the guardrail of the staircase platform passes through The hooks can be detachably connected; in this application, the 4 ladder-shaped steel mesh units and the 1 ladder-shaped steel mesh unit at the stairway are all quasi-trapezoid structures, except that the steel mesh unit at the stairway has a stairway and a stairway platform. Make a rectangular hole to make it easier for people to get in and out. The rectangular hole is covered with a piece of steel mesh, which can be easily removed and covered when people pass through.

The central circular steel mesh unit 5 covers the central hole of the ring beam platform of the FAST cabin docking platform, and is detachably connected to the inner guardrail riser of the FAST cabin docking platform.

As a further technical solution, a 5 mm hole is punched at the connection between the reflective panel 6 and the reflective panel facade sealing unit 1, and the upper ends of the reflective panel 6 and the reflective panel facade sealing unit 1 pass through a cotter pin 8 , flat washer 9 to achieve fixed connection.

As a further technical solution, several nylon belts 10 are evenly fixed on the long straight top edges of the trapezoidal steel mesh unit 2 and the trapezoidal steel mesh unit 3 at the stairway. The trapezoidal steel mesh unit 2 And the long straight top edge of the trapezoidal steel mesh unit 3 at the staircase is connected to the main cable 7 at the edge of the regular pentagonal hole in the center of the FAST reflective surface through the nylon belt 10.

As a further technical solution, the arc bottom edges of the trapezoidal steel mesh unit 2 and the trapezoidal steel mesh unit 3 at the stairway are connected to the outer ring of the ring beam platform of the FAST cabin docking platform equipment through double hooks 11 Guardrails and ladder platform guardrail connections.

As a further technical solution, a Velcro 12 is provided at the connection between the flexible cover 4 of the steel mesh unit at the stairway and the trapezoidal steel mesh unit at the stairway, and the two are adhesively connected through the Velcro 12 .

As a further technical solution, the central circular steel mesh unit 5 is detachably connected to the inner guardrail riser of the FAST cabin docking platform through a single hook 13; a circumferential edge of the central circular steel mesh unit 5 is sewn inside. A steel wire rope with a diameter of 5 mm; after the single hook 13 is hooked on the steel wire rope, it is hung on the inner guardrail riser of the FAST cabin docking platform. When the feed cabin docks at the port, just remove the circular steel mesh blocking unit. The sealing structure of the outer ring of the ring beam platform of the FAST cabin docking platform does not need to be disassembled.

As a further technical solution, the trapezoidal steel mesh unit 2 and the trapezoidal steel mesh unit 3 at the stairway are provided with a reserve amount in the height direction, that is, their height is greater than the desired blocking position when they are reset. The actual height in the state. Preferably, the reserved amount is 0.5 meters. The reserve amount is set to adapt to the change in the position of the main cable, because the guardrail at the ring beam platform is fixed, and the position of the regular pentagonal edge main cable changes when the FAST observation condition is used. The reserve amount is set to adapt to The position change of the main cable prevents the trapezoidal blocking unit from being damaged by tension during FAST observation conditions.

As a further technical solution, the central circular steel mesh unit 5 has a certain reserve in the diameter direction, that is, its diameter is larger than the diameter of the central hole of the ring beam platform of the FAST cabin docking platform. Preferably, the reserved amount is not less than 0.6 meters. Inside the ring beam platform of the FAST cabin docking platform, there is a circular hole with a diameter of 9.6 meters. The hole is blocked with a complete circular steel mesh unit made of one piece. The diameter of the circular unit is greater than 9.6 meters, with a certain diameter reserve left to accommodate the natural sagging of the steel mesh unit.

The present invention utilizes the ring beam platform and guardrails of the FAST cabin docking platform equipment. The upper surface panel of the ring beam platform of the cabin docking platform equipment is used as part of the sealing structure to participate in the sealing, and the guardrail is used as a fixed connection support of the steel mesh sealing unit. pieces. Among them, the long bottom sides of 4 trapezoidal steel mesh units and 1 trapezoidal steel mesh unit at the staircase are connected to the edge main cables of the regular pentagon, and the arc edges are connected to the outer guardrails at the ring beam platform and the guardrails at the staircase platform. Hooks and other connections. It has the following advantages:

There is no need to lower the inner and outer ring guardrails of the cabin docking platform, and there is no need to lower the three sets of lifting columns. The trapezoidal blocking structure on the outer ring of the cabin docking platform does not need to be dismantled. When the feed cabin enters the port, only the central circular steel mesh unit needs to be dismantled. , greatly reducing the time and labor required for dismantling the blocking structure, lowering the three sets of lifting columns on the cabin docking platform, and lowering the inner and outer ring guardrails.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, but not to limit it. 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 can be equivalently replaced; and these modifications or substitutions do not deviate from the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present invention. scope.

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.