CN112346235B - A FAST feed cabin positioning mechanism - Google Patents
A FAST feed cabin positioning mechanism Download PDFInfo
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- CN112346235B CN112346235B CN202011465580.3A CN202011465580A CN112346235B CN 112346235 B CN112346235 B CN 112346235B CN 202011465580 A CN202011465580 A CN 202011465580A CN 112346235 B CN112346235 B CN 112346235B
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- lower platform
- pulley
- feed
- platform
- wire rope
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B23/16—Housings; Caps; Mountings; Supports, e.g. with counterweight
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
- B66D1/60—Rope, cable, or chain winding mechanisms; Capstans adapted for special purposes
- B66D1/74—Capstans
- B66D1/7405—Capstans having two or more drums providing tractive force
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
- B66D1/60—Rope, cable, or chain winding mechanisms; Capstans adapted for special purposes
- B66D1/74—Capstans
- B66D1/7442—Capstans having a horizontal rotation axis
- B66D1/7447—Capstans having a horizontal rotation axis driven by motor only
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
- B66D1/60—Rope, cable, or chain winding mechanisms; Capstans adapted for special purposes
- B66D1/74—Capstans
- B66D1/7484—Details concerning gearing arrangements, e.g. multi-speed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
- B66D5/02—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes
- B66D5/12—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes with axial effect
- B66D5/14—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes with axial effect embodying discs
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Transmission Devices (AREA)
- Carriers, Traveling Bodies, And Overhead Traveling Cranes (AREA)
Abstract
The invention discloses a FAST feed cabin positioning mechanism which comprises a star frame, a plurality of flexible cable double-driving mechanisms, a feed platform and the like, wherein the feed platform comprises a lower platform and a lower platform switching ring, a multi-beam feed receiver is fixed on the lower platform, the lower platform is fixedly connected on the lower platform switching ring through a bolt pair, the plurality of flexible cable double-driving mechanisms which are arranged along the circumference are arranged at the upper part of the inner side surface of the star frame, each flexible cable double-driving mechanism comprises a servo sliding table, a winding mechanism, a steel wire rope, an open cable joint mechanism and a rotary support bearing and a pulley which are vertically arranged at the inner side of the star frame, and the steel wire rope of each flexible cable double-driving mechanism penetrates through the pulley to suspend the feed platform on the star frame. The invention uses a plurality of sets of flexible cable double driving mechanisms to realize parallel driving of the lower platform, replaces the AB swivel mechanism and the rigid parallel mechanism of the existing feed cabin, and solves the technical problems of small control angle, large weight of the feed cabin and the like of the existing feed cabin.
Description
Technical Field
The invention relates to astronomical equipment, in particular to a positioning mechanism for positioning a FAST feed cabin.
Background
A500 m caliber spherical radio telescope (Five-handred-meter Aperture Spherical radio Telescope, FAST) is the global largest single caliber radio astronomical telescope, and has three independent innovations, namely, natural karst pits in Guizhou are used as table addresses, a reflecting surface is actively deformed, a flexible light mechanism dragged by six cables in parallel is adopted to drag a feed cabin to realize primary cable driving, and an AB rotating shaft mechanism and a Stewart parallel mechanism in the feed cabin realize secondary fine adjustment of the feed pose and realize high-precision positioning of the feed source.
The FAST reflecting surface can realize the active deformation of the instantaneous 300-meter caliber reflecting surface, the parabolic surface is formed by spherical deformation, the parabolic surface is ensured to always point to a celestial body to be observed, and the 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.
For receiving radio waves, the feed source receiver is arranged in the feed source cabin, and is positioned in the range of 140m and 207m through a set of feed source supporting system. 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. The AB axis mechanism is a mechanism for two-dimensional rotation around two orthogonal A, B axes and mainly comprises an A axis and a drive thereof, a B axis and a drive thereof, and an AB axis swivel. The Stewart platform is a six-rod parallel mechanism and comprises an upper platform, a lower platform adapter ring, a lower platform, driving legs, a spherical hinge, a Hooke hinge and the like. The upper platform is provided with a B-axis interface, and the lower platform is required to bear the feed source receiver and the accessory mechanism. The multi-beam receiver steering device is a device for adjusting the multi-beam receiver to rotate around the normal direction by a certain angle on a Stewart lower platform.
When the FAST reflecting surface actively deforms, 6 steel cables are uniformly distributed on 6 hundred-meter high towers with the diameter of 600 meters, 6 steel cables form a cable traction parallel mechanism which is a first-stage control mechanism, 30 tons of FAST feed source cabins are dragged to perform astronomical tracking motion within the range of 200 meters at 150 meters high, the control accuracy (the central control point is the intersection point of an A axis and a B axis) which can be achieved by cable driving is that the spatial position error is less than or equal to RMS 48mm, the maximum value of the spatial attitude error is less than or equal to 1 DEG, an AB shaft mechanism is a second-stage control mechanism, the included angle between the normal line of a platform on Stewart and the central axis of a star frame is compensated, and the maximum rotation angle of the current design is +/-18 deg. The Stewart platform is used as a third-stage control mechanism and only compensates residual control errors of the first stage and the second stage and feed cabin vibration, and fine adjustment control is performed on the feed pose during tracking observation. Finally, real-time spatial position error of FAST feed source is required to be less than or equal to 10mm RMS, and high-precision pointing tracking observation of celestial bodies is realized.
Disclosure of Invention
The invention aims to provide a FAST feed cabin positioning mechanism which is novel and unique in structure, convenient to use and capable of effectively reducing the overall weight of a feed cabin and improving the feed cabin positioning control angle, and the FAST feed cabin positioning mechanism comprises the following specific technical scheme:
A FAST feed cabin positioning mechanism comprises a star frame and a feed platform, wherein the feed platform comprises a lower platform and a lower platform switching ring, a multi-beam feed receiver is fixed on the lower platform, the lower platform is fixedly connected to the lower platform switching ring through a bolt pair, a plurality of flexible rope double-driving mechanisms distributed along the circumference are arranged on the upper portion of the inner side face of the star frame, each flexible rope double-driving mechanism comprises a servo sliding table and a rope which are vertically arranged on the inner side of the star frame, a winding mechanism, an open cable joint mechanism and a rotary support bearing and a pulley which are arranged on the lower platform switching ring, and a steel wire rope of the winding mechanism penetrates through the pulley to hang the feed platform on the star frame.
Further, the flexible cable double-driving mechanism is divided into 6 sets.
Further, the winding mechanisms of the 6 sets of flexible cable double-driving mechanisms are uniformly distributed circumferentially along the winding drum of the upper platform.
Further, the assemblies formed by the slewing bearing of the 6 sets of flexible cable double-driving mechanisms and the pulley mechanisms are distributed circumferentially along the distribution circumference of the lower platform and are divided into 3 pairs, wherein each pair of pulley mechanisms is adjacent, and the 3 pairs of pulley mechanisms are uniformly distributed circumferentially along the distribution circumference of the lower platform at intervals of 120 degrees.
The flexible cable double-driving mechanism comprises a flexible cable double-driving mechanism, a winding machine and a winding machine, wherein the flexible cable double-driving mechanism further comprises a servo sliding table arranged in the vertical direction, the servo sliding table is provided with a sliding workbench capable of sliding in a controlled manner, the movable end of the steel cable is wound on a winding drum of the winding machine, the static end of the steel cable is fixed on a mounting seat plate of the servo sliding table and is static relative to a star frame, the winding drum is mounted on the sliding workbench, the movable end of the steel cable is anchored on the winding drum, or the static end of the steel cable is anchored on the sliding workbench, and the winding drum is fixed on the mounting seat plate of the servo sliding table.
Further, a limiting piece and a zero position switch which limit the moving distance of the sliding workbench are arranged on the servo sliding table.
Further, the hoisting mechanism is provided with a brake mechanism.
Further, one side of a winding drum of the winding machine is provided with a large gear as a driving disc, and the other side of the winding drum of the winding machine is provided with a brake disc of the brake mechanism.
The invention relates to a FAST feed cabin positioning mechanism which is used for upgrading and reforming a feed cabin and consists of a star frame, 6 sets of flexible cable double driving mechanisms, a lower platform adapter ring, a lower platform, a feed receiver and the like. The flexible cable double-driving mechanism consists of a vertically installed servo slipway, a hoisting mechanism, a steel wire rope, an assembly formed by a slewing bearing and a pulley and an open type cable joint mechanism, and the total number of the flexible cable double-driving mechanism is 12. The plane where the upper stroke limit position of the 6 sets of servo sliding tables passes through the center of the 6 sets of winding drums is set as an upper platform, and the plane where the center of the 6 sets of pulleys connected with the lower platform is set as a lower platform plane. The mechanism realizes pitching angle change of the lower platform through retraction and release of 6 ropes (realizes feed source angle compensation through track planning, and is called angle control in the text), realizes directional tracking of a feed source cabin on radio signals, and realizes rapid fine tuning of the platform through linear motion of a sliding workbench of 6 sets of servo sliding tables (realizes fine tuning of 5 degrees of freedom of the lower platform through linear motion of a sliding workbench of six sets of servo sliding tables in secondary control, and is called fine tuning control in the text).
Drawings
FIG. 1 is a schematic diagram of the overall structure of a FAST feed cabin positioning mechanism provided by the invention;
FIG. 2 is a top view of the overall structure of the FAST feed cabin positioning mechanism provided by the invention;
FIG. 3 is a schematic view of a flexible dual drive mechanism assembly provided by the present invention;
FIG. 4 is a schematic diagram of a servo slipway provided by the present invention;
FIG. 5 is a schematic view of a hoisting mechanism according to the present invention;
FIG. 6 is a schematic view of a pulley mechanism provided by the present invention;
FIG. 7 is a schematic view of an open-type socket mechanism provided by the present invention;
The multi-beam feed source receiver comprises a multi-beam feed source receiver, a lower platform switching ring, a lower platform, a 4-star frame cabin cable anchoring head seat, a 5-star frame, a 6-flexible cable double-driving mechanism, a 7-upper platform winding drum distribution circle, a 8-lower platform pulley distribution circle, a 9-servo sliding table mounting seat, a 10-open cable mechanism, a 11-servo sliding table, a 12-hoisting mechanism, a 13-wire rope, a 14-pulley mechanism, a 15-slewing bearing, a 16-servo sliding table guide rail seat, a 17-ball screw mechanism, a 18-sliding table, a 19-linear rolling guide rail, a 20-servo motor, a 21-synchronous belt, a 22-winding drum support seat, a 23-pinion driving mechanism, a 24-brake, a 25-winding drum support seat, a 26-winding drum shaft, a 27-brake disc, a 28-winding drum, 29-large gear, a 30-cylindrical roller bearing, a 31-pulley seat, a 32-axial bearing, a 33-small round nut, a 34-sliding bearing sleeve, a 35-pulley shaft, a 36-pulley, a 37-cable, a cable joint, a 38-linear rolling guide rail, a 20-servo motor, a servo drum bearing seat, a locking pin assembly and a 40-pin shaft.
Detailed Description
The present invention will be described more fully with reference to the following examples. This invention may be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein.
Spatially relative terms, such as "upper," "lower," "left," "right," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature's illustrated in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "under" other elements or features would then be oriented "over" the other elements or features. Thus, the exemplary term "lower" may encompass both an upper and lower orientation. The device may be otherwise positioned (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
As shown in fig. 1 and 2, the FAST feed cabin positioning mechanism in the embodiment comprises a star frame 5, a flexible cable double-driving mechanism 6, a feed platform and the like, wherein the feed platform comprises a lower platform 3 and a lower platform switching ring 2, the multi-beam feed receiver 1 is fixed on the lower platform 3, 6 sets of hoisting mechanisms 12 distributed circularly and uniformly along an upper platform winding drum are arranged at the upper part of the inner side surface of the star frame 5, the flexible cable double-driving mechanism 6 comprises an assembly formed by a rotary support bearing and a pulley mechanism which are arranged on the lower platform switching ring, a steel wire rope of the flexible cable double-driving mechanism penetrates through a pulley of the pulley mechanism and is fixedly connected to a servo sliding table mounting seat plate 9, and the mounting seat plate 9 is fixedly connected with the star frame 5 to suspend the feed platform on the star frame. The length of the steel wire rope is changed through a hoisting mechanism, and the space position and angle of the feed source platform are adjusted. The center of the upper platform winding drum distribution circle is on the central shaft of the star-shaped frame 5. The number of the winding mechanisms 12 is not limited to 6, but may be 3 or 4, and should be more than 3. The multi-beam feed source receiver 1 is pulled from multiple directions by adopting multiple steel wire ropes 13, and the space state, including the space position and the angle, of the multi-beam feed source receiver 1 is adjusted, so that the tracking speed of a telescope focus can be completely met. The pitching angle adjustment range of the multi-beam feed source receiver 1 can reach +/-25 degrees, and the rotation angle of an AB axis in the existing feed source cabin of far-exceeding FAST is +/-18 degrees. The outer edge of the star frame 5 is provided with 3 star frame cabin cable anchoring head bases 4 for connecting with the support tower through flexible cables.
The winding mechanism 12 is divided into 6 sets. The 6 sets of hoisting mechanisms 12 are uniformly distributed circumferentially along the center of the upper platform winding drum, the assemblies formed by the pulley mechanisms 14 and the slewing bearing 15 in each set of flexible cable double-driving mechanism 6 are distributed circularly along the center of the lower platform pulley, the pulley mechanisms 14 are fixedly connected onto the inner ring of the slewing bearing 15 through bolts, the outer ring of the slewing bearing 15 is fixedly connected onto the lower platform switching ring 2 through bolts, and the pulley mechanisms 14 can rotate around the center line of the slewing bearing 15. The assembly formed by the pulley mechanism 14 and the rotary support bearing 15 is divided into 3 pairs, the positions of the assemblies formed by each pair of pulley mechanism 14 and the rotary support bearing 15 are close, and the 3 pairs of pulley mechanism 14 and rotary support bearing 15 are uniformly distributed along the lower platform at intervals of 120 degrees. The space position and the angle of the feed source platform are convenient to adjust. Of course, the space position and angle of the feed source platform can be adjusted, and the scheme control algorithm of the non-uniform distribution is complicated.
In order to eliminate the influence of wind or vibration caused by the vibration of the flexible cable in other transmission processes, the flexible cable double-driving mechanism 6 further comprises a servo sliding table 11 arranged in the vertical direction, the servo sliding table 11 is provided with a sliding workbench 18 capable of sliding in a controlled manner, the movable end of the steel wire rope is wound on a winding drum of the winch, and the stationary end of the steel wire rope is anchored on a servo sliding table mounting seat plate 9 and is stationary relative to the star-shaped frame. Or the fixed end of the steel wire rope 13 is anchored on the sliding workbench 18, and the winding drum is fixed on the servo slipway mounting seat board 9.
The servo sliding table 11 is fixed on the servo sliding table mounting seat plate 9, and the servo sliding table mounting seat plate 9 and the upper ball joint and the lower ball joint of the star frame are welded into a whole to serve as a support of the servo sliding table 11.
As shown in fig. 3, the double-drive mechanism 6 is composed of a servo slide table 11, a hoisting mechanism 12, a wire rope 13, a pulley mechanism 14, a slewing bearing 15, and an open-type knuckle mechanism 10. The servo slipway 11 is fixedly connected to the servo slipway mounting seat board 9 through bolts. The winding mechanism 12 is fixedly connected to the sliding workbench 18 of the servo sliding table through bolts and moves linearly up and down along with the sliding workbench 18. The pulley mechanism 14 is fixedly connected with the inner ring of the rotary support bearing 15 through bolts, the outer ring of the rotary support bearing 15 is fixedly connected with the lower platform adapter ring 2 through bolts, and the pulley mechanism 14 can rotate around the axis of the rotary support bearing 15. The anchor seat 40 of the open type cable joint mechanism 10 is fixedly connected to the servo sliding table mounting seat plate 9 through bolts and is positioned at the lower limit position of the servo sliding table. One end of the steel wire rope 13 is thermally anchored with a cable joint of the open cable joint mechanism, passes through the pulley mechanism 14 and is wound on a winding drum 28 of the winding mechanism 12, the steel wire rope 13 is anchored on the winding drum 28 at the left end of the winding drum, the steel wire rope 13 is in a lower rope outlet structure layout, and the overturning moment of the winding drum support 25 is reduced. The cable double-driving mechanism 6 is connected with the lower platform adapter ring 2 through a steel wire rope 13, a pulley mechanism 14 and a slewing bearing 15 to form a flexible cable parallel mechanism.
As shown in fig. 4, the servo slide table 11 mainly includes a servo slide table guide rail seat 16, a ball screw mechanism 17, a slide table 18, 2 linear rolling guide rails 19, a servo motor 20, a timing belt 21, and the like. The servo motor 20 transmits rotation to the ball screw 17 through a driving synchronous pulley and a synchronous belt 21 which are fixedly connected with an output shaft of the servo motor and a driven synchronous pulley which is fixedly connected with the ball screw 17, and the ball screw 17 drives a sliding workbench 18 fixedly connected to a ball screw nut to do up-down linear motion along 2 linear rolling guide rails 19. The sliding table 18 is divided into an upper run and a lower run by an intermediate zero switch. The upstroke and downstroke may be the same or slightly different from each other in length. The servo slipway 11 drives the hoisting mechanism 12 on the sliding workbench 18 to move up and down rapidly along the linear rolling guide 19, and the dynamic response is fast.
As shown in fig. 5, the winding mechanism 12 includes a spool support 22, a spool support 25, a large gear 29, a pinion drive mechanism 23, a spool 28, a spool shaft 26, and a cylindrical roller bearing 30. In order to improve the control stability of the feed source platform, the hoisting mechanism is provided with a brake disc 27 and a brake 24 as braking mechanisms, and when the hoisting mechanism reaches an ideal position, the length of the steel wire rope is fixed through the braking mechanisms, so that the stability of the system is improved. The brake disc 27 and the large gear 29 are fixedly connected with the winding drum through bolts, and the gear shaft 26 is matched with the holes of the brake disc 27 and the large gear 29 in a shaft mode and is stopped through a flat key to be fixedly connected with the winding drum part. The spool supports 22, 25 support both ends of the spool shaft 26 by 2 sets of cylindrical roller bearings 30, and the spool shaft 26 is rotatable about its own axis. The bottom surfaces of the spool support 22 and the spool support 25 are attached to the slide table 18 and are fixed by bolts. The bottom surface of the pinion drive mechanism 23 is attached to the slide table 18 and is fixed thereto by bolts. The pinion driving mechanism 23 is meshed with the large gear 29, and drives the large gear 29 to drive the winding drum to rotate. The bottom surface of the stopper 24 is attached to the slide table 18, and is fixed to the slide table 18 by bolts. Brake 24 is mated with brake disc 27, and brake pads of brake 24 grip brake disc 27 to provide a braking action on the spool, and brake pads are released to release brake disc 27. In the figure, the large gear is provided on the left side or the right side as a drive disk. One side of a winding drum of the winding machine is provided with a gear serving as a driving disc, and the other side of the winding drum of the winding machine is provided with a brake disc of the brake mechanism, so that the structure is simpler.
As shown in fig. 6, the pulley mechanism 14 is composed of a pulley holder 31, 2 pulley axial retainers 32, a small round nut 33, a slide bearing bush 34, a pulley shaft 35, and a pulley 36. The bottom plate of the pulley seat 31 is matched with the end surface of the inner ring of the rotary support bearing 15 and is fixedly connected with the end surface of the inner ring of the rotary support bearing 15 through bolts, and the bearing seat of the rotary support bearing 15 is fixed on the lower platform adapter ring 2. Pulley mechanism 14 is rotatable about the axis of swivel support bearing 15 to accommodate rotation of pulley 36 with wire rope 13 when the parallel mechanism is in operation.
As shown in fig. 7, the open-type socket mechanism 10 is a hook-and-loop mechanism, and the oldham coupling block 39 has 2 holes perpendicular to each other, and the 2 holes are respectively connected with the holes of the anchor seat 40 and the open-type socket 37 through 2 sets of pin assemblies 38. The steel wire rope 13 is thermally anchored with the open cable joint 37, and the hook mechanism can enable the steel wire rope 13 to adapt to the angle change when the steel wire rope 13 is retracted and released, and bending is reduced, so that the steel wire rope 13 is prevented from being repeatedly bent and damaged.
When the multi-beam feed receiver is used, the winding mechanism 12 is driven by the servo motor 20 to move to the vicinity of the zero position of the middle point of the stroke, so that the spatial state of the multi-beam feed receiver 1 can be conveniently and rapidly finely adjusted according to the offset signals fed back by the acceleration sensor or the laser interferometer, the jitter is eliminated, and the multi-beam feed receiver 1 is stabilized at a target position. The pinion driving mechanism 23 of the 6-set flexible cable double driving mechanism 6 respectively drives the winding drum 28 to rotate according to the instruction of the control unit to slowly shrink or loosen the steel wire rope 13 wound on the winding drum 28, and the steel wire rope 13 is matched with the winding drum to adjust the phase center point of the multi-beam feed source receiver 1 to the vicinity of the focal point of the reflecting surface, and the feed source center line is parallel to the focal axis of the reflecting surface. The servo motor 20 of the 6 slipway of the 6 sets of flexible cable double driving mechanisms drives the winding mechanism 12 to move upwards or downwards rapidly along the linear rolling guide rail 19 according to the instruction of the control unit, and the phase center position of the multi-beam feed source receiver 1 is rapidly finely adjusted to be near the corner point of the reflecting surface and the center line of the feed source is parallel to the focal axis of the reflecting surface.
The application relates to a FAST feed cabin positioning mechanism which is used for upgrading and reforming a feed cabin and consists of a star frame, 6 sets of flexible cable double driving mechanisms, a lower platform adapter ring, a lower platform, a feed receiver and the like. The flexible cable double-driving mechanism consists of a servo slipway, a winding mechanism, a steel wire rope, a pulley mechanism, a slewing bearing, an open type cable joint mechanism and the like which are vertically arranged, and the total number of the flexible cable double-driving mechanism is 12. The plane where the upper stroke limit position of the 6 sets of servo sliding tables passes through the center of the 6 sets of winding drums is set to be an upper platform plane, and the plane where the center of the 6 sets of pulleys connected with the lower platform is set to be a lower platform plane. The mechanism realizes pitching angle change of the lower platform through retraction and release of 6 ropes (realizes feed source angle compensation through track planning, and is called angle control in the text), realizes fine adjustment of the platform through linear motion of a sliding workbench of 6 sets of servo sliding tables (realizes fine adjustment of 5 degrees of freedom of the lower platform through linear motion of a sliding workbench of six sets of servo sliding tables in secondary control), and the scheme of the application reduces the total weight of a feed source cabin to 26 tons.
The invention uses 6 sets of flexible cable double driving mechanisms to realize parallel driving of the lower platform, replaces the AB swivel mechanism and the rigid parallel mechanism of the existing feed cabin, and solves the technical problems of small control angle, large weight of the feed cabin and the like of the existing feed cabin.
The above examples are for illustration of the invention only and, in addition, there are many different embodiments which will be apparent to those skilled in the art after having the insight into the present invention and are not explicitly recited herein.
Claims (8)
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| CN213517737U (en) * | 2020-12-14 | 2021-06-22 | 中国科学院国家天文台 | A FAST feed cabin positioning mechanism |
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| US3155832A (en) * | 1960-04-02 | 1964-11-03 | Optische Ind De Oude Delft Nv | Panoramic infrared telescope |
| CN203614661U (en) * | 2013-12-20 | 2014-05-28 | 大连华锐重工集团股份有限公司 | Cable driven steel wire rope connecting device and astronomical telescope feed source cabin connected therewith |
| CN105856205B (en) * | 2016-06-17 | 2017-11-17 | 中国矿业大学 | A kind of flexible cable suspention simulation system in parallel and its method |
| CN109454635B (en) * | 2018-10-15 | 2020-09-25 | 山东中衡光电科技有限公司 | Steel wire flexible cable parallel mirror surface machining device based on lever principle |
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| CN213517737U (en) * | 2020-12-14 | 2021-06-22 | 中国科学院国家天文台 | A FAST feed cabin positioning mechanism |
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