Cage cable-based FAST cable-driven pulley high-altitude inspection and maintenance method

Abstract

The invention discloses a cage cable-based FAST cable-driven pulley high-altitude inspection and maintenance method. The method comprises the following steps of S1, controlling a feed source cabin to descend to a feed source cabin parking platform located at the center of a reflecting surface; s2, the position of a cable-driven pulley needing to be checked and maintained is determined, a cable crane is controlled to run in the circumferential direction of a ring beam, and a cage cable system is made to transversely move to the position of the cable-driven pulley needing to be maintained; s3, determining a lifting pulley platform at the center of the reflecting surface corresponding to the steel wire rope, and switching the lower anchoring end of the cableway to the lifting pulley platform; s4, the cableway hanging basket is controlled to ascend and descend or move to the accurate position of the tackle needing to be inspected and maintained along the cableway, maintenance operation is carried out, after tackle inspection and maintenance operation on one steel wire rope is completed, the cable crane is moved, the lifting pulley platform corresponding to the cable system anchor is replaced, the cableway is transversely moved to the position of the next steel wire rope, and maintenance is carried out. And the hanging basket is obliquely moved to the lower platform of the cable crane to be stopped.

Description

Technical Field

[0001] The invention relates to the technical field of astronomical observation and equipment maintenance, in particular to a high-altitude inspection and maintenance method of a FAST cable-driven pulley based on a cage cable. Background Art

[0002] The Five-hundred-meter Aperture Spherical radioTelescope (FAST) consists of more than 4,000 reflector units forming a 500-meter spherical active reflector. It uses a lightweight six-cable drag mechanism and parallel robots to achieve high-precision positioning of the telescope receiver. The telescope includes four major process systems: reflector system, feed support system, measurement and control system, and feed and receiver system.

[0003] The cable drive mechanism in the feed support system, namely the flexible cable traction parallel robot, retracts and releases 6 steel wire ropes through 6 sets of winch drive mechanisms and control systems distributed in the machine room at the bottom of the tower, and tractions the 30-ton feed cabin in parallel to move the focal plane at an altitude of about 140 meters and a range of about 206 meters, so as to achieve the tracking of astronomical trajectories by the feed cabin and the positioning of the feed receiver in the cabin. There are 65 pulleys hanging on each steel wire rope, and cables and optical cables are hung on the pulleys as channels for power supply and signal transmission of equipment in the feed cabin. Adjacent pulleys are connected by double stainless steel wire ropes (traction ropes) to pull them together to prevent the cables or optical cables from being stressed. In order to ensure the structural stability of FAST and maximize its service life, regular and comprehensive inspections and maintenance of FAST's structure are required. FAST currently observes around the clock, all year round. The FAST cable-driven wire rope, pulleys, cables, etc. are always in high altitudes, with poor accessibility for personnel, and difficult equipment inspection and maintenance. Recently, the cable-driven wire rope often has sludge accumulation and hardening, which in turn causes the cable-driven pulley to get stuck and cause the telescope to stop observing. Pullers, pulleys, and guide ropes often have problems, and they need to be shut down for inspection immediately, which brings risks to the operation of the telescope and huge challenges to on-site maintenance. When such problems occur, the cabin can only be lowered and the wire rope loosened, and as close to the reflective surface as possible, and then workers can try to climb up and straddle the wire rope and pulley for inspection and maintenance. This maintenance method has problems such as narrow working surface, difficult climbing maintenance, and high safety risks. Summary of the invention

[0004] The purpose of the present invention is to provide a method for high-altitude inspection and maintenance of FAST cable-driven pulleys based on cage cables. During the shutdown and maintenance of FAST, the method can accurately and efficiently transport maintenance personnel to the vicinity of the cable-driven pulleys that need to be inspected and maintained. The method also provides maintenance personnel with a safe and efficient high-altitude work platform, effectively solving the shortcomings of poor accessibility of maintenance personnel in the prior art, high safety risks of climbing close to the pulleys with bare hands, and narrow working surfaces, thereby improving work efficiency.

[0005] To achieve the above-mentioned purpose, the present invention provides a high-altitude inspection and maintenance method of a FAST cable-driven pulley based on a cage cable, which is applied to a FAST telescope having a reflector system and a feed support system. In the feed support system, a plurality of support towers control the position of a feed cabin relative to the reflector system through a plurality of steel wires, and a plurality of pulleys for hanging electric cables and optical cables are arranged on each steel wire, and a feed cabin docking platform and a cable hanger are also arranged; the method is characterized in that the method comprises the following steps:

[0006] Step S1. Control the feed cabin to descend to the docking platform located at the center of the reflective surface, and relax the cable-driven wire rope to a suitable catenary state so that it is close to the top of the reflective surface;

[0007] Step S2. Determine the position corresponding to the cable-driven pulley that needs to be inspected and maintained, control the cable crane to move along the ring beam to the position corresponding to the cable-driven pulley that needs to be maintained, and the upper anchor end of the cableway moves with the cable crane;

[0008] Step S3. Determine the lifting pulley platform at the center of the reflection surface corresponding to the cable-driven pulley where the pulley to be maintained is located, switch the lower anchor end of the cableway to the corresponding lifting pulley platform, and ensure that the cableway moves vertically to the top of the cable-driven pulley to be maintained;

[0009] Step S4. The maintenance personnel operate and control the ropeway basket to move from the cable hoisting platform along the ropeway to the vicinity of the rope-driven pulley that needs maintenance, and the maintenance personnel carry out the maintenance work. After completing the inspection and repair work of one rope-driven pulley, the maintenance personnel control the basket to withdraw to the cable hoisting platform and park it, and then move the cable hoist and the corresponding lifting pulley platform, switch the ropeway to the corresponding position of the next rope-driven pulley that needs maintenance, and complete the inspection and maintenance work of the pulley on the next wire rope. After this operation is completed, the basket is controlled to withdraw to the platform below the cable hoist and park.

[0010] Further, in step S1, a total of 6 feed cabin steel ropes are provided, one end of the steel rope is connected to the feed cabin, and the other end is connected to the support tower, the support tower is located outside the ring beam, and the wire rope is loosened by a cable-driven winch drive mechanism at the bottom of the support tower.

[0011] Furthermore, one end of the load-bearing rope of the cage cable system is connected to the top winch of the higher-positioned ring beam cable crane, and the other end is connected to the box-type column of the central lifting pulley platform of the reflecting surface at a lower position. The basket is suspended on the load-bearing rope, and maintenance personnel can ride on the basket and move along the load-bearing rope to the position of the cable-driven pulley that needs maintenance for maintenance.

[0012] Furthermore, the upper ends of the load-bearing rope, safety rope and traction rope of the cage rope basket are connected to the top of the cable crane tower by connecting them to the cable crane winch, and the winch is used to brake and fix the wire rope; the load-bearing rope is a main cable of the cable crane trolley, which is connected to the winch through a guide wheel at the top of the tower of the cable crane trolley, and the braking function of the winch is used to fix the rope length of the wire rope; the safety rope uses the traction rope on the original cable crane trolley, which is connected to the traction winch through a guide wheel at the top of the tower of the cable crane trolley, and the braking function of the traction winch is used to fix the rope length of the wire rope.

[0013] Furthermore, the cableway basket includes a basket body, an oblique lifting mechanism, a vertical lifting mechanism and a control electrical box; the oblique lifting mechanism is used to drive the cableway basket to move on the load-bearing rope in an inclined direction through an oblique lifting traction rope; the vertical lifting mechanism is used to control the lifting and lowering of the basket body in a vertical direction.

[0014] Furthermore, the cableway basket also includes a safety rope for operators, a safety lock and a rope retractor.

[0015] Furthermore, the cableway basket is a double-person basket, which uses the load-bearing rope under half-span conditions as the suspension mechanism of the rope-driven pulley maintenance basket. The double-person basket has two suspension points connected by a connecting rod, and a double roller pulley is arranged on each suspension point and suspended on the load-bearing steel wire rope. It can be lifted up and down obliquely along the catenary-shaped load-bearing rope using the special steel wire rope traction rope of the basket along the inclined hoist.

[0016] Further, in step S4, the cable crane is moved to a position parallel to the feed cabin cable drive, the verticality of the load-bearing rope, safety rope and traction rope is adjusted to meet the installation requirements of the hanging basket, the hanging basket equipment is hung, and the verticality of the load-bearing rope, safety rope and traction rope is adjusted to the set size again, the hanging basket equipment is hung, the verticality of the load-bearing rope, safety rope and traction rope is adjusted, and the cableway basket is moved obliquely and up and down by the oblique lifting mechanism and the vertical lifting mechanism to the pulley position that needs maintenance.

[0017] Furthermore, the set dimension is the verticality f0=19m.

[0018] Furthermore, the operation process of the cableway basket is as follows: first, the oblique lifting mechanism is controlled by the controller inside the cableway basket, so that the cableway basket runs along the load-bearing rope toward the cable-driven pulley that needs maintenance; when it runs close to the pulley that needs maintenance, the vertical lifting mechanism is controlled to further approach the cable-driven pulley that needs maintenance in the vertical direction. After the maintenance work is completed, the maintenance personnel control the basket to withdraw to the cable hanging platform and dock. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The schematic diagram of the structure of the reflector system of FAST is shown;

[0020] Figure 2 The schematic diagram of the structure of the feed support system of FAST is shown;

[0021] Figure 3 A schematic diagram of the side structure of FAST is shown;

[0022] Figure 4 A schematic diagram of a use scenario of a high-altitude inspection and maintenance method for a FAST cable-driven pulley based on a cage cable is shown;

[0023] Figure 5 A schematic diagram of the cable crane structure is shown;

[0024] Figure 6 Shows a schematic diagram of the lifting pulley platform structure;

[0025] Figure 7 A schematic diagram of the cableway basket structure is shown;

[0026] Figure 8 A schematic diagram of a rope connection structure is shown;

[0027] Fig. 9 A schematic diagram of the double-limb suppression rigging structure is shown. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] The following combination Figure 1-Figure 9 The specific embodiments of the present invention are described in detail. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0032] like Figure 1 As shown, the FAST telescope includes a reflector system 100 and a feed support system 200. The reflector system 100 is used to detect and collect cosmic astronomical signals, and the feed support system 200 is used to focus the signals collected by the reflector system to track the astronomical trajectory and preliminarily locate the position of the feed receiver in the cabin. The feed support system 200 is arranged above the reflector system 100.

[0033] like Figure 2 As shown, the reflective surface system 100 includes a plurality of reflective surface units ( Figure 2 The spherical main cable net 101 supporting several reflective surface units, the ring beam 102 as the main cable net support structure, the lower cable 103 providing tension for the main cable net, and the feed cabin docking platform 104 located at the center of the main cable net. Several reflective surface units form a parabolic shape suitable for observation according to the observed object.

[0034] like Figure 3As shown, the feed support system 200 includes a feed cabin 201, a plurality of support towers 202 arranged on the periphery of the ring beam 102, and a wire rope 203 arranged between the support tower 202 and the feed cabin 201, a winch drive mechanism and a control center for controlling the wire rope. The feed cabin 201 is at the focal position of the parabola, and is used to focus the signal collected by the reflector system. Due to the deformation of the reflector in the observation of celestial body motion, the shape of the parabola and the change of the focal position will be brought about. Therefore, the feed cabin 201 also needs to be controlled to move to the corresponding position by each wire rope. For this reason, one end of each wire rope 203 is connected to the feed cabin 201, and the other end is connected to the winch drive mechanism at the bottom of the support tower 202 through the top pulley of the support tower 202, and the winch drive mechanism realizes the retraction and release operation of the wire rope. The control center realizes the precise control of the position of the feed cabin 201 by controlling multiple wire ropes. In the non-use state or maintenance state, the feed cabin 201 can be controlled to dock on the port entry platform 104. In the specific embodiment, a total of 6 support towers are set up, corresponding to 6 steel wire ropes. In order to achieve precise control, the control center also includes a total station, GPS, wind and temperature sensors, on-site monitoring devices, model solving devices, tension meters, tower top encoders, servo motor encoders, drum encoders and six-cable synchronous motion controllers.

[0035] By controlling the retraction and extension of 6 steel wires, the feed cabin weighing 30 tons is pulled in parallel to move at an altitude of about 140 meters and within a range of about 200 meters. A number of pulleys 204 are hung on each steel wire. The pulleys are used to hang cables and optical cables as channels for power supply and signal transmission of equipment in the feed cabin. Adjacent pulleys are connected by double stainless steel traction steel wires to pull each other to prevent the cables or optical cables from being stressed.

[0036] In order to realize high-altitude inspection and maintenance of equipment and facilities such as cable-driven pulleys, the present invention provides a high-altitude inspection and maintenance method for FAST cable-driven pulleys based on cage cables, through which maintenance personnel can be directly transported to the position of the pulley that needs inspection and maintenance, thereby avoiding the technical problems in the prior art that maintenance personnel need to climb up the cable-driven pulley and rely on riding on the cable drive to move slowly to approach the position of the cable-driven pulley that needs maintenance, resulting in high risk factors, narrow working surfaces, difficulty in movement, etc.

[0037] To this end, according to the present invention, the high-altitude inspection and maintenance method of the FAST cable-driven pulley based on the cage cable is as follows:

[0038] Step S1. Control the feed cabin to descend to the docking platform located at the center of the reflective surface and anchor it, and loosen the cable drive wire rope appropriately; so that the cable is close to the top of the reflective surface;

[0039] Step S2. Determine the position of the wire rope and pulley that need to be inspected and maintained, control the cable crane to run in a circular direction along the ring beam, the upper anchoring end of the basket ropeway is the top of the cable crane, and as the cable crane moves, the cage rope can be moved horizontally to the position of the rope-driven wire rope pulley that needs maintenance; the lower anchoring end of the basket ropeway is the lifting pulley platform around the cabin docking platform, and the upper anchoring end and the lower anchoring end are connected to form a basket ropeway; Step S3. Determine the position corresponding to the rope-driven wire rope pulley that needs maintenance, switch the lower anchoring end of the ropeway to the corresponding lifting pulley platform, and ensure that the ropeway moves vertically to the top of the rope-driven wire rope pulley that needs maintenance;

[0040] Step S4. The maintenance personnel control the cage to move up and down from the cable hoisting platform to the cable-driven pulley area, and control the cableway basket (cage) to rise and fall, or move along the cableway to the precise position of the pulley that needs inspection and maintenance, and carry out maintenance work. After completing the inspection and repair of the pulley on one wire rope, the maintenance personnel control the cage back to the cable hoisting platform, move the cable hoist and replace the lifting pulley platform corresponding to the cable anchor, move the cableway horizontally to the position of the next wire rope, and then complete the inspection and maintenance of the pulley on the next wire rope until this maintenance work is completed, and move the basket obliquely to the platform under the cable hoist and stop.

[0041] Specifically, in step S1, the feed cabin is lowered to the docking platform and anchored, and the six steel ropes are appropriately loosened to facilitate maintenance personnel to check equipment such as pulleys and cables on the maintenance cable drive steel ropes through the hanging basket.

[0042] In step S2, the upper anchor point of the hanging basket rope system is the top of the cable crane on the ring beam, and the lower anchor point is the lifting pulley platform box column at the center of the reflective surface. The upper and lower anchor points are connected to form a maintenance ropeway. The cable crane is controlled to run along the ring beam to the position corresponding to the wire rope that needs maintenance, and the upper anchor end of the hanging basket ropeway moves with the cable crane. When the cable crane walks on the ring beam, the tightening and loosening degree of the load-bearing rope is synchronously controlled by the tensioning winch.

[0043] In step S3, three lifting pulley platforms are arranged around the docking platform of the feed cabin, which are the lower connection anchor points corresponding to the cage cable system. The angle between each lifting pulley platform is 120 degrees. The load rope, traction rope and safety rope of the hanging basket are all detachably connected to the box column of the lifting pulley platform through the rotating hook of the double-limb pressing rigging. When the maintenance of different rope-driven pulleys needs to be switched, the cage cable system cableway is switched from one lifting pulley platform to another, and the cable hoist is opened to cooperate to realize the translation and conversion of the entire cage cable system.

[0044] In step S4, by moving the cable to a position parallel to the wire rope of the feed cabin, adjusting the verticality of the load rope, safety rope, and traction rope, controlling the hanging basket equipment to move downward from the cable lowering platform, adjusting the verticality of the load rope, safety rope, and traction rope (verticality f0 = 19m), and completing the pulley maintenance of a feed cabin cable at the position of the pulley lifting pulley platform 1 by moving the hanging basket obliquely and up and down by the hoist. First, the controller in the cableway hanging basket controls the oblique lifting mechanism so that the cableway hanging basket runs along the load rope toward the pulley that needs maintenance; when it runs close to the pulley that needs maintenance, the vertical lifting mechanism is controlled to further approach the cable drive pulley that needs maintenance in the vertical direction.

[0045] The hardware equipment used in the method includes a cable crane 300, a cableway basket 400 and a lifting pulley platform 500; the radial half-span cable basket system is used to perform high-altitude maintenance of the pulleys on the six cable-driven steel wire ropes. The supporting structure of the newly built cage rope (the cage in the present invention is the basket, and the cage rope is also called the basket ropeway or simply the ropeway) for inspection and maintenance of the cable-driven pulley is comprehensively considered with the original structure to avoid interference with the original structure, and at the same time facilitate switching between the three lifting pulley platforms.

[0046] like Figure 4 As shown, the FAST reflector system is provided with a ring beam 102 as a peripheral supporting structure of the spherical main cable net. The ring beam 102 has an inner ring beam and an outer ring beam located at the top. The cable crane 300 is slidably disposed on the ring beam 102 and can move along the ring beam 102 to any position of the ring beam.

[0047] like Figure 5 As shown, the cable crane 300 includes a running mechanism, a supporting structure and an actuator. The running mechanism is used to drive the cable crane to run along the track on the upper surface of the ring beam. The ring beam 102 has an inner ring beam 1021 and an outer ring beam 1022 at the top. Each running wheel group of the running mechanism is driven forward or backward by a motor. A braking device is also provided on the running mechanism.

[0048] The supporting structure is arranged on the traveling mechanism, and the supporting structure includes a column 307, an inclined support frame 308 and a winch bracket 309. A cab 315 is arranged on one side of the inclined support frame 308, and the cable crane 300 is operated in the cab. The upper anchor end of the cableway moves with the cable crane. The upper ends of the load rope, safety rope and traction rope of the pulley maintenance basket are connected to the top of the tower of the cable crane moving on the ring beam, and the connection method is to directly use the wire rope fixed in the braking state of the winch.

[0049] A tension winch 311 and a traction winch 312 are provided on the winch bracket 310. The tension winch 311 is used to control the tension and relaxation of the load-bearing rope 313 forming the cableway, and the load-bearing rope 313 is connected to the tension winch 311 through a first guide pulley provided on the winch bracket 310 to form an upper anchoring end of the cableway; the traction winch 312 is used to control the tension and relaxation of the traction rope 314, and the traction rope 314 is connected to the traction winch 312 through a second guide pulley provided on the winch bracket 310.

[0050] In addition, the cable crane 300 also includes a generator set for supplying power to the inspection and maintenance device. When power is supplied by cable, a cable drum, a hydraulic station and an electrical control system are also provided.

[0051] like Figure 6 As shown, the lifting pulley platform 500 is arranged around the feed cabin docking platform 104 through a box column 501. Three lifting pulley platforms 500 are arranged correspondingly based on the connection position of the wire rope and the feed cabin, respectively referred to as the first lifting pulley platform, the second lifting pulley platform and the third lifting pulley platform. The upper surface of each lifting pulley platform 500 serves as the lower anchor end of the cage cable system. A cantilever is provided on the lifting pulley platform 500, and a rotating ring is provided on the cantilever. The load-bearing rope of the cage cable system is connected to the rotating ring.

[0052] In order to facilitate the conversion, the box column at the lower end and its position are optimized and adjusted: the lower end of the cableway is connected to the rotating ring of the box column cantilever in the middle of the large roller at the cabin cable anchor point, such as Figure 8 As shown in the figure, the connection method is to press an embedded heart ring on the wire rope head to form a heart ring wire rope head, and then use a double-limb pressing rigging to connect it with the wire rope head. Fig. 9 As shown, the rotating hook of the double-legged pressing rigging is connected with the rotating lifting eye. The rope ends of the load rope, safety rope and traction rope all adopt double-legged pressing rigging, and each double-legged pressing rigging includes two bow shackles, called bow shackle A and bow shackle B, to facilitate the mutual conversion of different rope drive pulley maintenance.

[0053] Specifically, one end of the cableway's carrying rope 313 is connected to a higher-positioned cable crane 300, and the other end is connected to a lower-positioned lifting pulley platform 500. The cableway basket 400 is suspended on the carrying rope 313. Maintenance personnel can ride on the cableway basket 400 and move along the carrying rope 313 to the pulley position that needs maintenance to perform maintenance.

[0054] like Figure 7As shown, the cableway basket 400 includes a basket body 401, an oblique lifting mechanism 403, a vertical lifting mechanism 402 and a control electric box 405; the oblique lifting mechanism 403 is used to drive the cableway basket 400 to move on the load-bearing rope 313 in the oblique direction through the oblique lifting traction rope 404; the vertical lifting mechanism 402 is used to control the lifting and lowering of the basket body 401 in the vertical direction. In addition, the cableway basket 400 also includes a worker safety rope, a safety lock and a rope retractor. The oblique climbing hoist uses a rope winding mechanism with heavy weight but large friction lifting force, and the vertical hoists fixed at both ends of the basket body 401 use an "α" type rope winding mechanism with light weight and slightly small friction force.

[0055] When the feed cabin is in port, the six steel wire ropes of the feed cabin are all suspended with cables and curtain mechanisms. Each steel wire rope is divided into three sections: the front section, the middle section and the end section. The front section is the first 96.5m steel wire rope section starting from the anchor point on the cabin cable, which is used to suspend fixed pulleys and mid-length pulleys, and the cables are directly fixed on the steel wire ropes. The middle section is the ordinary pulley stacking section. Under the maximum cable force when entering the port, there are about 5 ordinary pulleys, and the distance between adjacent pulleys (middle to middle) is 0.66m to ensure the minimum bending radius of the cable. After the pulleys are stacked, the cables suspended between adjacent ordinary pulleys reach the maximum verticality, and the verticality from the lowest end of the cable to the steel wire rope is 2.85m. The end section is the ordinary pulley deployment section, with a distance between adjacent ordinary pulleys (middle to middle) of 5m, and the number of its pulleys is 60.

[0056] The top of the cable crane moving on the uniformly circumferential ring beam on the upper end of the load-bearing rope, safety rope and traction rope of the cableway basket is connected by anchoring it on the cable hoist and using the brake function of the hoist to fix the length of the wire rope. The lower end of the cable system is connected to the box-shaped column on the lifting pulley platform at the center of the reflective surface, and the connection method is to press an embedded chicken heart ring on the wire rope head to form a chicken heart ring wire rope head.

[0057] The driving mode of the hanging basket: lithium battery or cable power supply. The cable solution is a traditional power supply method, which is complicated in operation and requires the addition of a specific pulley system and cable tightening device. The lithium battery solution is a new power supply solution, which is efficient and flexible, requires less maintenance, but the weight of the hanging basket is relatively large. After optimization and comparison, the lithium battery power supply solution was selected.

[0058] The hanging basket is usually docked on the cable hanging platform, and the maintenance system is in a no-load state. According to calculation and analysis, when the mid-span deflection is 19m, it can ensure that the cage rope system can maintain a sufficient safety distance from the reflective surface during use.

[0059] Figure 3This is a schematic diagram of the position of the load-bearing cable of the cable-driven pulley high-altitude maintenance system under no-load conditions. At this time, the hanging basket is located on the cable hanging platform, the cable system is in a relaxed state, and the maintenance system is in an unloaded state. According to calculation and analysis, when the mid-span deflection is 19m, it can be ensured that the cage cable system can maintain a sufficient safe distance from the reflective surface during use.

[0060] Figure 4 This is a schematic diagram of the position relationship of the load-bearing cable, cabin cable, and reflective surface under the mid-span fully loaded working condition of the cable-driven pulley high-altitude maintenance system. At this time, the maintenance basket is fully loaded and located at the mid-span position of the load-bearing cable of the maintenance system. The cables near the basket and their mounted small pulleys are in a tightened state, and the cables and their mounted small pulleys in the distance are in a relaxed state. The load-bearing cable is located near the anchor point at one end of the cable hanger, and a cable tightening device is arranged to ensure the tightening state of the cable. The position relationship of each cable in the figure is calculated according to the load state at this time.

[0061] The Φ28mm load-bearing steel wire rope of the original cable crane under half-span conditions is used as the suspension mechanism of the pulley maintenance basket. The double-person hanging basket has two suspension points connected by a connecting rod. A double roller pulley is set on each suspension point and suspended on the load-bearing steel wire rope. It can be lifted up and down with a large slope using a galvanized steel wire rope traction rope for the hanging basket on the catenary-shaped cable crane load-bearing steel wire rope. The inclined climbing hoist uses a rope winding mechanism with heavy weight but large friction lifting force. The vertical hoist fixed at both ends of the double-person hanging basket uses an "α" type rope winding mechanism with light weight and slightly small friction force.

[0062] The load-bearing rope is a main cable of the original cable crane trolley, which is connected to the winch through a guide wheel at the top of the tower of the cable crane trolley, and then the wire rope is fixed by utilizing the braking state of the winch.

[0063] The safety rope uses the traction rope on the original cable crane trolley, which is connected to the traction winch through the guide wheel at the top of the tower of the cable crane trolley, and then the braking state of the traction winch is used to fix the wire rope.

[0064] A guide pulley is added on the top of the cable crane trolley, and the traction rope is pulled to the platform vehicle through the guide pulley. A traction winch is added to the platform vehicle, and the braking function of the traction winch is used to fix the traction wire rope.

[0065] The lower cable anchor point of the cage rope can be rotated 360° in the plane and 180° in the vertical direction by installing a rotating ring.

[0066] When the power unit of the cableway basket fails and cannot move autonomously, the traction rope is connected to the load-bearing wire rope by a shackle, and then the connection between the cage traction wire rope and the box-type column rotating lifting ring is untied, and the basket is lifted to the platform vehicle by the cable crane traction rope winch, thereby achieving the technical problem of being able to safely withdraw to the cable crane platform when the power unit of the cableway basket fails and cannot move autonomously.

[0067] Under the action of wind load horizontal force, the load rope, traction rope and safety rope have large lateral displacement (displacement value 10.11~13.31m) because there is no lateral constraint in the rope span. In order to avoid interference with the feed cabin cable, when unloaded, the cable crane should be parked on the 1H ring beam and not interfere with the cable drive.

[0068] Any process or method description in the flowchart of the present invention or described in other ways herein can be understood as a module, segment or part of a code including one or more executable instructions for implementing the steps of a specific logical function or process, which can be implemented in any computer-readable medium for use by an instruction execution system, device or equipment, and the computer-readable medium can be any medium containing storage, communication, propagation or transmission programs for use by execution systems, devices or equipment, including read-only memories, magnetic disks or optical disks, etc.

[0069] In the description of this specification, the description with reference to the terms "embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. In addition, those skilled in the art can combine or combine different embodiments or examples described in this specification and the features therein without causing any contradiction.

[0070] Although the above content has shown and described the embodiments of the present invention, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace, modify and other update operations on the above embodiments within the scope of the present invention.

Claims

1. A method for high-altitude inspection and maintenance of a FAST cable-driven pulley based on a cage cable, which is applied to a FAST telescope having a reflector system and a feed support system; in the feed support system, six support towers lead out six steel wires to pull and control the feed cabin to move on the focal plane of the telescope, and each steel wire is provided with a number of pulleys for hanging cables and optical cables, and a feed cabin docking platform is provided at the center of the bottom of the reflector for lowering the feed cabin and docking; the reflector system is provided with a cable crane running on the ring beam; it is characterized in that, The method comprises the following steps: Step S1. Control the feed cabin to descend to the docking platform located at the center of the reflective surface and anchor it, and properly loosen the cable drive wire rope; Step S2. Determine the position of the wire rope and pulley that need to be inspected and maintained, control the cable crane to run in a circular direction along the ring beam, the upper anchorage end of the basket ropeway is the top of the cable crane, and the cage rope moves laterally to the position of the rope-driven wire rope pulley that needs maintenance as the cable crane moves; the lower anchorage end of the basket ropeway is the lifting pulley platform around the cabin docking platform, and the upper anchorage end and the lower anchorage end are connected to form a basket ropeway; Step S3. Determine the position corresponding to the cable-driven wire rope pulley that needs maintenance, switch the lower anchor end of the cableway to the corresponding lifting pulley platform, and ensure that the cableway moves vertically to the top of the cable-driven wire rope pulley that needs maintenance; Step S4. The maintenance personnel control the cage to move up and down from the cable hoisting platform to the cable-driven pulley area, and control the ropeway basket to rise and fall, or move along the ropeway to the precise position of the pulley that needs to be inspected and maintained, to carry out maintenance work. After completing the inspection and repair of the pulley on one wire rope, the maintenance personnel control the cage back to the cable hoisting platform, move the cable hoist and replace the lifting pulley platform corresponding to the cable anchor, move the cableway horizontally to the position of the next wire rope, and then complete the inspection and maintenance of the pulley on the next wire rope until this maintenance work is completed, and move the basket obliquely to the platform under the cable hoist for docking.

2. The method for high-altitude inspection and maintenance of a FAST cable-driven pulley based on a cage cable according to claim 1, characterized in that: In step S1, the feed cabin is lowered to the docking platform and anchored, and the six steel ropes are appropriately loosened to facilitate maintenance personnel to check the pulleys and cables on the maintenance cable drive steel ropes through the hanging basket.

3. The method for high-altitude inspection and maintenance of a FAST cable-driven pulley based on a cage cable according to claim 2, characterized in that: One end of the cableway's carrying rope is connected to the top of the higher cable crane, and the other end is connected to the lower central lifting pulley platform of the reflecting surface. The basket is suspended on the carrying rope. Maintenance personnel ride on and control the basket to move along the carrying rope to the pulley position that needs maintenance for maintenance.

4. The method for high-altitude inspection and maintenance of a FAST cable-driven pulley based on a cage cable according to claim 3 is characterized in that: The upper ends of the bearing rope, safety rope and traction rope of the cableway basket are connected to the winch at the top of the tower of the cable crane. The connection method is to anchor the connection through the winch drum and fix the wire rope in the braking state of the winch; the bearing rope is a main cable wire rope of the original cable crane trolley, which is fixed to the winch drum through a guide wheel at the top of the tower of the cable crane trolley, and the braking function of the winch is used to fix the rope length of the wire rope; the safety rope uses the traction rope on the original cable crane trolley, which is connected to the traction winch drum through a guide wheel at the top of the tower of the cable crane trolley, and the braking state of the traction winch is used to fix the rope length of the wire rope.

5. The method for high-altitude inspection and maintenance of a FAST cable-driven pulley based on a cage cable according to claim 4, characterized in that: The cableway basket includes a basket body, an oblique lifting mechanism, a vertical lifting mechanism and a control electric box; the oblique lifting mechanism is used to control the movement of the cableway basket on the carrying rope in the inclined direction through oblique lifting drive; the vertical lifting mechanism is used to control the lifting and lowering of the basket body in the vertical direction.

6. The method for high-altitude inspection and maintenance of a FAST cable-driven pulley based on a cage cable according to claim 5, characterized in that: The cableway basket also includes a safety rope, a safety lock and a rope retractor for operators.

7. The method for high-altitude inspection and maintenance of a FAST cable-driven pulley based on a cage cable according to claim 6, characterized in that: The ropeway basket is a double-person basket. The load-bearing rope under half-span conditions is used as the suspension mechanism of the pulley maintenance basket. The double-person basket has two suspension points connected by a connecting rod. A double roller pulley is set on each suspension point and suspended on the load-bearing wire rope. The inclined hoist uses the special wire rope traction rope of the basket to move up and down obliquely and lift and lower on the catenary-shaped load-bearing rope.

8. The method for high-altitude inspection and maintenance of a FAST cable-driven pulley based on a cage cable according to claim 7, characterized in that: In step S4, the cage rope is controlled by the cable crane to be parallel to the feed cabin cable drive, the verticality of the load-bearing rope, safety rope and traction rope are adjusted to meet the installation requirements of the hanging basket, the hanging basket equipment is suspended, and the hanging basket is controlled and operated by the maintenance personnel. The cableway hanging basket is moved obliquely and up and down by the oblique lifting mechanism and the vertical lifting mechanism to the pulley position that needs maintenance.

9. The method for high-altitude inspection and maintenance of a FAST cable-driven pulley based on a cage cable according to claim 8, characterized in that: The set dimension is the verticality f0=19m.

10. The method for high-altitude inspection and maintenance of a FAST cable-driven pulley based on a cage cable according to claim 9, characterized in that: The operation process of the cableway basket is as follows: first, the controller inside the cableway basket controls the oblique lifting mechanism, so that the cableway basket runs along the load-bearing rope toward the wire rope pulley that needs maintenance; when it runs close to the wire rope pulley that needs maintenance, the vertical lifting mechanism is controlled to further approach the wire rope pulley that needs maintenance in the vertical direction, so that the maintenance personnel can maintain the pulley. After the operation is completed, the basket is controlled to withdraw to the cable hanging platform and stop, completing a working cycle.

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