An antenna turntable for low earth orbit satellite communications

Abstract

The application belongs to the technical field of satellite antennas, and particularly relates to an antenna rotating platform for low-orbit satellite communication, which comprises a base, a U-shaped support frame and an antenna mounting frame, and further comprises: a first fixed cylinder fixedly arranged at the top of the base, a horizontal rotating shaft rotatably arranged at the central axis position of the first fixed cylinder, and the upper end of the horizontal rotating shaft being fixedly connected with the U-shaped support frame. The first torque sensor and the second torque sensor are used to monitor the torsion of the horizontal and pitching rotating shafts in real time, so as to provide a load basis for the system to trigger a protection mechanism and optimize motor parameters, and to guarantee the tracking stability of the antenna. Meanwhile, the first electromagnetic braking mechanism and the second electromagnetic braking mechanism are used to realize efficient braking and buffer external force impact. In addition, the first lubricating mechanism and the second lubricating mechanism are used to provide continuous lubrication and cooling for the bearing parts, reduce friction and wear, prolong the service life of the parts, and improve the reliability and accuracy of the equipment in complex environments.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of satellite antennas, and particularly relates to an antenna turntable for low-orbit satellite communication. BACKGROUND

[0002] In the field of low-orbit satellite communication, the antenna turntable is the core equipment for realizing accurate pointing of the antenna to the satellite, and its stable operation is directly related to the continuity and reliability of the communication link. The low-orbit satellite has the characteristics of low orbit height and fast running speed, which requires the antenna turntable to adjust the angles of the horizontal rotation axis (X-axis direction) and the pitch rotation axis (Y-axis direction) in real time to continuously track the satellite track. For example, the antenna turntable for low-orbit satellite communication disclosed in the announcement No. CN115036697A.

[0003] However, the antenna turntable usually works in an outdoor environment and is inevitably affected by wind. When the wind acts on the antenna reflector, different degrees of torque will be generated on the horizontal rotation axis and the pitch rotation axis, and the greater the wind, the greater the torque. The torque fluctuation may cause slight rotation or shaking of the horizontal rotation axis and the pitch rotation axis, resulting in deviation of the antenna beam pointing from the satellite, causing communication signal attenuation, high error rate, and even temporary interruption of the communication link. Secondly, long-term torque impact will aggravate the friction and wear between the rotation axis and the bearing, not only shortening the service life of the components, but also possibly causing the shafting precision to decrease and further reducing the tracking precision.

[0004] Therefore, the application provides an antenna turntable for low-orbit satellite communication. SUMMARY

[0005] The application aims to solve the above problems and provides an antenna turntable for low-orbit satellite communication.

[0006] To achieve the above-mentioned purpose, the application adopts the following technical scheme: an antenna turntable for low-orbit satellite communication, comprising a base, a U-shaped support frame and an antenna mounting frame, further comprising:

[0007] A first fixed cylinder is fixedly arranged at the top of the base, a horizontal rotation axis is rotatably arranged at the central axis position of the first fixed cylinder, the upper end of the horizontal rotation axis is fixedly connected with the U-shaped support frame, a horizontal motor is fixedly arranged on the inner wall of the bottom of the first fixed cylinder, and a transmission mechanism is arranged between the output end of the horizontal motor and the horizontal rotation axis;

[0008] A first torque sensor is fixedly arranged on the inner wall of the bottom of the first fixed cylinder, and the rotating end of the first torque sensor is fixedly connected with the lower end of the horizontal rotation axis;

[0009] A first electromagnetic brake mechanism is fixedly arranged in the first fixed cylinder and located on the shaft wall of the horizontal rotating shaft.

[0010] A second fixed cylinder is fixedly arranged on the side wall of the U-shaped support frame, and an elevation motor is fixedly arranged in the second fixed cylinder. An elevation rotating shaft is rotatably arranged in the U-shaped support frame, one end of the elevation rotating shaft is fixedly connected with the output end of the elevation motor, and the antenna mounting frame is fixedly arranged on the shaft wall of the elevation rotating shaft.

[0011] A third fixed cylinder is fixedly arranged on the side wall of the U-shaped support frame, and a second torque sensor is fixedly arranged in the third fixed cylinder. The rotating end of the second torque sensor is fixedly connected with one end of the elevation rotating shaft.

[0012] A second electromagnetic brake mechanism is fixedly arranged on the side wall of the U-shaped support frame and located in the third fixed cylinder and on the shaft wall of the elevation rotating shaft.

[0013] A first lubricating mechanism is arranged on the top of the first fixed cylinder.

[0014] A second lubricating mechanism is arranged in the U-shaped support frame.

[0015] Preferably, the transmission mechanism comprises a first gear fixedly arranged on the output end of the horizontal motor, and a second gear is fixedly arranged on the shaft wall of the horizontal rotating shaft, and the first gear and the second gear are arranged in meshing.

[0016] Preferably, the first electromagnetic brake mechanism comprises a shielding cylinder fixedly arranged in the first fixed cylinder, two arc-shaped clamping plates are symmetrically arranged in the shielding cylinder, two elastic expansion rods are symmetrically fixed between the inner wall of the shielding cylinder and the side of the two arc-shaped clamping plates facing away from each other, a permanent magnet is fixedly arranged on the outer side wall of each of the two arc-shaped clamping plates, an energized magnet is fixedly arranged on the inner side wall of the shielding cylinder and corresponding to the positions of the two permanent magnets, a wear degree detection mechanism is arranged between the side wall of the two arc-shaped clamping plates and the inner wall of the shielding cylinder, and the second electromagnetic brake mechanism has the same structure as the first electromagnetic brake mechanism.

[0017] Preferably, the wear degree detection mechanism comprises an insulating connecting rod fixedly arranged on the outer side wall of the arc-shaped clamping plate, a conductive block is fixedly arranged on the end of the insulating connecting rod away from the arc-shaped clamping plate, an L-shaped fixed plate is fixedly arranged on the inner side wall of the shielding cylinder, an electric resistance rod is fixedly arranged in the L-shaped fixed plate, and the conductive block is slidingly arranged on the rod wall of the electric resistance rod.

[0018] Preferably, the inside of the first fixed cylinder is fixedly provided with a supporting plate, the shielding cylinder is fixedly arranged on the upper surface of the supporting plate, the horizontal rotating shaft is rotatably connected with the shielding cylinder through a sealing element, and a liquid discharge hole is arranged in the side wall of the first fixed cylinder above the supporting plate.

[0019] Preferably, the first lubricating mechanism comprises a first liquid storage tank fixedly arranged on the top of the first fixed cylinder, a first liquid supply pipe is arranged in the first liquid storage tank, a first hollow disc is fixedly arranged on the top of the first fixed cylinder outside the horizontal rotating shaft, the side wall of the first hollow disc is fixedly connected with the end of the first liquid supply pipe away from the first liquid storage tank, and a plurality of first liquid discharge holes are arranged on the lower surface of the first hollow disc.

[0020] Preferably, the second lubricating mechanism comprises a second liquid storage tank fixedly arranged in the U-shaped support frame, a second liquid supply pipe is arranged in the second liquid storage tank and extends to both sides, a second hollow disc is fixedly arranged on the inner wall of the U-shaped support frame outside the pitching rotating shaft, the side wall of each of the two second hollow discs is fixedly connected with the end of the second liquid supply pipe away from the second liquid storage tank, and a plurality of second liquid discharge holes are arranged on the side surface of each of the two second hollow discs.

[0021] Preferably, the side wall of the first fixed cylinder and the side wall of the second fixed cylinder are both provided with heat dissipation windows.

[0022] Compared with the prior art, the application has the following beneficial effects:

[0023] The first torque sensor and the second torque sensor can capture the dynamic changes of the torque borne by the horizontal rotating shaft and the pitching rotating shaft during operation in real time, which can provide accurate load judgment basis for the antenna control system, and can also assist in optimizing the driving parameters of the horizontal motor and the pitching motor, so that the horizontal and pitching angle adjustment is more stable and accurate, the antenna can continuously and stably maintain the wireless communication link with the satellite, the mechanical friction and loss are reduced, and the stability of the antenna in tracking the satellite is ensured.

[0024] The first electromagnetic brake mechanism and the second electromagnetic brake mechanism can achieve efficient brake protection when the horizontal rotating shaft and the pitching rotating shaft bear a large torque, the friction is used to increase the rotating resistance of the horizontal rotating shaft and the pitching rotating shaft, the passive brake effect is formed, the impact of external torque on the horizontal rotating shaft and the pitching rotating shaft is effectively buffered, the wear detection mechanism converts the wear state of the arc-shaped clamping plate into an electric current signal feedback through the sliding change of the conductive block on the resistance rod, the system can timely identify the wear of the brake component and trigger an alarm, the brake performance is stable, and the safety of the rotating shaft and the transmission component is double-protected.

[0025] Through the first lubricating mechanism and the second lubricating mechanism, the bearing parts of the horizontal rotating shaft and the pitching rotating shaft can be continuously and uniformly lubricated and cooled, the heat generated by friction can be removed in time under the high-torque working condition, the lubricating grease can be prevented from being invalid due to high temperature, the friction and wear between the horizontal rotating shaft, the pitching rotating shaft and the bearing can be reduced, the service life of the bearing is prolonged, and the stability and smoothness of the horizontal rotating shaft and the pitching rotating shaft during braking and running are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a first perspective view of an antenna turntable for low-orbit satellite communication provided by the application;

[0027] Figure 2 is a second perspective view of an antenna turntable for low-orbit satellite communication provided by the application;

[0028] Figure 3 is a perspective view of an antenna turntable for low-orbit satellite communication provided by the application;

[0029] Figure 4 is a perspective view of a first electromagnetic braking mechanism of an antenna turntable for low-orbit satellite communication provided by the application;

[0030] Figure 5 is a perspective view of a first lubricating mechanism of an antenna turntable for low-orbit satellite communication provided by the application;

[0031] Figure 6 is a perspective view of a second lubricating mechanism of an antenna turntable for low-orbit satellite communication provided by the application.

[0032] In the figure: 1 base, 2 U-shaped support frame, 3 antenna mounting frame, 4 first fixed cylinder, 5 horizontal rotating shaft, 6 horizontal motor, 7 transmission mechanism, 71 first gear, 72 second gear, 8 first torque sensor, 9 first electromagnetic braking mechanism, 91 shielding cylinder, 92 arc-shaped clamping plate, 93 elastic telescopic rod, 94 permanent magnet block, 95 electrified magnet block, 96 wear degree detection mechanism, 961 insulating connecting rod, 962 conductive block, 963 L-shaped fixed plate, 964 resistance rod, 10 second fixed cylinder, 11 pitching motor, 12 pitching rotating shaft, 13 third fixed cylinder, 14 second torque sensor, 15 second electromagnetic braking mechanism, 16 first lubricating mechanism, 161 first liquid storage tank, 162 first liquid supply pipe, 163 first hollow disc, 164 first liquid outlet hole, 17 second lubricating mechanism, 171 second liquid storage tank, 172 second liquid supply pipe, 173 second hollow disc, 174 second liquid outlet hole, 18 supporting plate, 19 liquid discharge hole, 20 heat dissipation window. DETAILED DESCRIPTION

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0034] like Figures 1 to 6 As shown, an antenna turntable for low-Earth orbit satellite communication includes a base 1, a U-shaped support frame 2, and an antenna mounting frame 3. The base 1 is fixedly installed on the ground foundation of the communication station by bolts. Then, the antenna is installed on the antenna mounting frame 3, which has mounting holes that match the antenna. The turntable also includes:

[0035] The first fixed cylinder 4 is fixedly installed on the top of the base 1. A horizontal rotating shaft 5 is rotatably installed at the central axis of the first fixed cylinder 4. The upper end of the horizontal rotating shaft 5 is fixedly connected to the U-shaped support frame 2. A horizontal motor 6 is fixedly installed on the bottom inner wall of the first fixed cylinder 4. A transmission mechanism 7 is provided between the output end of the horizontal motor 6 and the horizontal rotating shaft 5. The transmission mechanism 7 includes a first gear 71 fixedly installed on the output end of the horizontal motor 6, and a second gear 72 fixedly installed on the shaft wall of the horizontal rotating shaft 5. The first gear 71 and the second gear 72 are meshed together.

[0036] The first torque sensor 8 is fixedly installed on the bottom inner wall of the first fixed cylinder 4, and the rotating end of the first torque sensor 8 is fixedly connected to the lower end of the horizontal rotating shaft 5. The first torque sensor 8 can detect the dynamic changes in torque on the horizontal rotating shaft 5 during operation.

[0037] The first electromagnetic brake mechanism 9 is fixedly arranged in the first fixed barrel 4, and the first electromagnetic brake mechanism 9 is located on the shaft wall of the horizontal rotating shaft 5; the first electromagnetic brake mechanism 9 comprises a shielding barrel 91 fixedly arranged in the first fixed barrel 4, the inside of the first fixed barrel 4 is fixedly provided with a supporting plate 18, the shielding barrel 91 is fixedly arranged on the upper surface of the supporting plate 18, the horizontal rotating shaft 5 is rotatably connected with the shielding barrel 91 through a sealing element, the sealing property of the connection is improved, the side wall of the first fixed barrel 4 and located above the supporting plate 18 is provided with a liquid discharge hole 19, the cooling liquid at the connecting position of the horizontal rotating shaft 5 and the first fixed barrel 4 can enter the inside of the first fixed barrel 4, and the liquid discharge hole 19 can discharge the cooling liquid entering the inside of the first fixed barrel 4; the inside of the shielding barrel 91 is symmetrically provided with two arc-shaped clamping plates 92, two elastic expansion rods 93 are symmetrically and fixedly arranged between the inner wall of the shielding barrel 91 and the sides, away from each other, of the two arc-shaped clamping plates 92, the outer side walls of the two arc-shaped clamping plates 92 are both fixedly provided with a permanent magnet block 94, the inner side wall of the shielding barrel 91 and located corresponding to the positions of the two permanent magnet blocks 94 are both fixedly provided with a current-carrying electromagnetic block 95, when the current of the current-carrying electromagnetic block 95 decreases, the repulsion force acting on the permanent magnet block 94 decreases, at this time, the elastic expansion rod 93 applies an elastic force to the permanent magnet block 94, so that the permanent magnet block 94 gradually approaches the current-carrying electromagnetic block 95 and the clamping force of the arc-shaped clamping plate 92 on the horizontal rotating shaft 5 decreases; the side walls of the two arc-shaped clamping plates 92 and the inner wall of the shielding barrel 91 are provided with a wear degree detection mechanism 96, the shielding barrel 91 is made of an anti-electromagnetic interference material, so that the horizontal motor 6 does not generate electromagnetic interference on the components in the inside of the shielding barrel 91; the wear degree detection mechanism 96 comprises an insulating connecting rod 961 fixedly arranged on the outer side wall of the arc-shaped clamping plate 92, an electrically-conductive block 962 fixedly arranged at the end, away from the arc-shaped clamping plate 92, of the insulating connecting rod 961, an L-shaped fixed plate 963 fixedly arranged on the inner side wall of the shielding barrel 91, an electrically-resistance rod 964 fixedly arranged in the inside of the L-shaped fixed plate 963, and the electrically-conductive block 962 is slidably arranged on the rod wall of the electrically-resistance rod 964, so that the electrically-conductive block 962 can be moved on the electrically-resistance rod 964 along with the movement of the arc-shaped clamping plate 92, and the length of the electrically-resistance rod 964 connected in the loop is changed.

[0038] The second fixed barrel 10 is fixedly arranged on the side wall of the U-shaped support frame 2, and the inside of the second fixed barrel 10 is fixedly provided with the pitching motor 11; the inside of the U-shaped support frame 2 is rotatably provided with a pitching rotating shaft 12, one end of the pitching rotating shaft 12 is fixedly connected with the output end of the pitching motor 11, and the antenna mounting frame 3 is fixedly arranged on the shaft wall of the pitching rotating shaft 12; the side wall of the first fixed barrel 4 and the side wall of the second fixed barrel 10 are both provided with a heat dissipation window 20, the heat in the inside of the first fixed barrel 4 and the second fixed barrel 10 can be dissipated through the heat dissipation window 20, so that the horizontal motor 6 and the pitching motor 11 can stably operate, and meanwhile, the side walls of the first fixed barrel 4 and the second fixed barrel 10 are both provided with a switch door, so that the staff can maintain the components in the inside.

[0039] The third fixed cylinder 13 is fixedly arranged on the side wall of the U-shaped support frame 2, and a second torque sensor 14 is fixedly arranged in the third fixed cylinder 13. The rotating end of the second torque sensor 14 is fixedly connected with one end of the pitch rotating shaft 12, and the second torque sensor 14 can detect the dynamic change of the torque of the pitch rotating shaft 12 during operation.

[0040] The second electromagnetic brake mechanism 15 is fixedly arranged on the side wall of the U-shaped support frame 2, and is arranged in the third fixed cylinder 13 and on the shaft wall of the pitch rotating shaft 12. The structure of the second electromagnetic brake mechanism 15 is the same as that of the first electromagnetic brake mechanism 9. When the power supply of the second electromagnetic brake mechanism 15 is turned on, the pitch rotating shaft 12 can be braked.

[0041] The first lubricating mechanism 16 is arranged on the top of the first fixed cylinder 4. The first lubricating mechanism 16 comprises a first liquid storage tank 161 fixedly arranged on the top of the first fixed cylinder 4. A first liquid supply pipe 162 is arranged in the first liquid storage tank 161. The first liquid storage tank 161 stores cooling liquid. A first hollow disc 163 is fixedly arranged on the top of the first fixed cylinder 4 and outside the horizontal rotating shaft 5. The end of the first liquid supply pipe 162 away from the first liquid storage tank 161 is fixedly connected with the side wall of the first hollow disc 163. A plurality of first liquid outlet holes 164 are arranged on the lower surface of the first hollow disc 163 and are uniformly distributed. The first liquid outlet holes 164 are directed towards the connecting bearing between the horizontal rotating shaft 5 and the first fixed cylinder 4.

[0042] The second lubricating mechanism 17 is arranged in the U-shaped support frame 2. The second lubricating mechanism 17 comprises a second liquid storage tank 171 fixedly arranged in the U-shaped support frame 2. The second liquid storage tank 171 stores cooling liquid. Second liquid supply pipes 172 are arranged in the second liquid storage tank 171 and extend to both sides. Second hollow discs 173 are fixedly arranged on the inner walls of the U-shaped support frame 2 and outside the pitch rotating shaft 12. The ends of the second liquid supply pipes 172 away from the second liquid storage tank 171 are fixedly connected with the side walls of the second hollow discs 173, respectively. A plurality of second liquid outlet holes 174 are arranged on the side surfaces of the second hollow discs 173 and are uniformly distributed. The second liquid outlet holes 174 on the second hollow discs 173 are directed towards the connecting bearings between the pitch rotating shaft 12 and the U-shaped support frame 2, respectively.

[0043] The operation principle of the application is described as follows: firstly, the base 1 is fixedly installed on the ground foundation of the communication station, so that the whole device has a stable support foundation during subsequent operation, then the antenna is installed on the antenna mounting frame 3 to ensure that the initial attitude of the antenna meets the basic assembly requirements, the power supply of the rotating table is connected, so that the rotating table enters the standby state, and the horizontal motor 6, the first torque sensor 8, the first electromagnetic brake mechanism 9, the horizontal motor 6, the pitch motor 11 and the second torque sensor 14, the second electromagnetic brake mechanism 15, the first lubricating mechanism 16 and the second lubricating mechanism 17 on the rotating table are electrically connected with the antenna control system;

[0044] When the horizontal angle and the pitch angle of the antenna need to be adjusted (such as multi-satellite relay communication), it is necessary to switch to the orbital position of the next target satellite, at this time, the antenna control system automatically starts the horizontal motor 6 and the pitch motor 11, the horizontal motor 6 drives the first gear 71 to rotate, the first gear 71 is meshed with the second gear 72 to drive the horizontal rotating shaft 5 to rotate, thereby synchronously completing the rotation adjustment of the horizontal angle of the U-shaped support frame 2 and the top antenna, and the lower end of the horizontal rotating shaft 5 is rigidly connected with the rotating end of the first torque sensor 8 in the rotating process, with the rotation of the rotating end of the first torque sensor 8, the elastic element in the first torque sensor 8 produces a small deformation proportional to the torsion, the strain gauge attached to the surface of the elastic element changes in resistance, the physical deformation is converted into an electrical signal through the Wheatstone bridge, and the electrical signal is fed back to the antenna control system, so as to output the dynamic data of the torsion suffered by the horizontal rotating shaft 5 in real time, which can timely feedback the load conditions of the horizontal shaft caused by wind force, mechanical friction and other factors, so as to provide a judgment basis for the control system, if the torsion exceeds the safety threshold, the protection mechanism such as speed reduction and shutdown can be triggered in time, and through the continuous monitoring of the torsion change, the antenna control system can assist in optimizing the driving parameters of the horizontal motor 6 according to the detected torsion data, so that the horizontal angle adjustment is more stable and accurate, and the loss of mechanical parts is reduced;

[0045] At the same time, the pitch motor 11 drives the pitch rotating shaft 12 to rotate, thereby driving the antenna mounting frame 3 to realize the adjustment of the pitch angle, and finally completing the full-automatic adjustment of the antenna position, when the pitch rotating shaft 12 rotates, the end portion thereof is linked with the second torque sensor 14 to real-time capture the torsion size suffered in the pitch direction, which can provide safety protection and precision optimization support for the pitch adjustment, so as to ensure that the whole antenna rotating table can accurately track the satellite and guarantee the long-term stable operation of the equipment under complex working conditions;

[0046] When the weather is windy, the wind acts on the antenna, the antenna mounting frame 3 and the U-shaped support frame 2, so that the horizontal rotating shaft 5 and the pitching rotating shaft 12 bear a larger torsion force. At this time, the first torque sensor 8 and the second torque sensor 14 can capture the dynamic changes of the torsion force in real time, and accurately feed back the detected real-time data to the antenna control system. If the detected torsion force has not exceeded the safe bearing range of the turntable, but has approached the warning value, the system will preferentially adjust the output power of the horizontal motor 6 and the pitching motor 11, reduce the rotating speed of the horizontal rotating shaft 5 and the pitching rotating shaft 12, and reduce the superimposed impact of external force and driving force by slowing down the movement rhythm. At the same time, the antenna control system optimizes the angle correction algorithm to offset the pointing deviation caused by the wind with more delicate fine-tuning actions, so as to ensure the stability of the communication link. If the torsion force of the horizontal rotating shaft 5 and the pitching rotating shaft 12 continues to rise and exceeds the safety threshold, the system will immediately trigger the protection mechanism to stop the operation of the horizontal motor 6 and the pitching motor 11, so as to avoid damage to the horizontal rotating shaft 5 and the pitching rotating shaft 12 due to overload. At the same time, the antenna control system keeps real-time calculation of the satellite trajectory to prepare for rapid re-tracking after the wind weakens.

[0047] At the same time, the antenna control system will simultaneously turn on the power supply of the energized magnetic block 95 on the horizontal rotating shaft 5 and the pitching rotating shaft 12, and gradually increase the current. After the energized magnetic block 95 is energized, it will generate a magnetic repulsion force to the permanent magnetic block 94. Under the action of the repulsion force, the permanent magnetic block 94 drives the arc-shaped clamping plate 92 to move against the elastic force of the elastic extension rod 93, until the arc-shaped clamping plate 92 at the corresponding position is in close contact with the surface of the horizontal rotating shaft 5 and the pitching rotating shaft 12. Through the friction force between the arc-shaped clamping plate 92 and the horizontal rotating shaft 5 and the pitching rotating shaft 12, the rotating resistance of the horizontal rotating shaft 5 and the pitching rotating shaft 12 is effectively increased, forming a passive braking effect, so as to buffer the direct impact of external torsion force on the shafting and reduce the wear risk of the transmission components. It can not only adapt to the working condition flexibly when the wind fluctuates, but also build double protection under extreme load, so as to finally realize the protection of the antenna and the overall structure of the turntable.

[0048] When the torsion force of the horizontal rotating shaft 5 and the pitching rotating shaft 12 continues to rise and exceeds the safety threshold, the antenna control system will automatically start the pump body in the first liquid storage tank 161 and the second liquid storage tank 171. The pump body will draw the cooling liquid in the liquid storage tank into the first liquid supply pipe 162 and the second liquid supply pipe 172 respectively, and then discharge it into the first hollow disc 163 and the second hollow disc 173. Finally, it is uniformly sprayed to the rotating bearing part of the horizontal rotating shaft 5 and the pitching rotating shaft 12 through the corresponding first liquid outlet hole 164 and the second liquid outlet hole 174. The cooling liquid can timely take away the heat at the bearing part (when the bearing bears a large torsion force, the friction will be sharply increased and a large amount of heat will be generated), so as to ensure the stability of the horizontal rotating shaft 5 and the pitching rotating shaft 12 in braking and subsequent operation.

[0049] In the process of braking the horizontal rotating shaft 5 and the pitching rotating shaft 12 by the first electromagnetic brake mechanism 9 and the second electromagnetic brake mechanism 15, the arc-shaped clamping plate 92 is moved synchronously with the brake action, and then the conductive block 962 at the end of the insulating connecting rod 961 slides on the resistance rod 964, the effective length of the resistance rod 964 connected to the circuit is reduced, the resistance of the resistance rod 964 is reduced, according to Ohm's law, the current in the circuit is increased, by connecting high-precision measuring circuit at both ends of the resistance rod 964, the subtle changes of the current can be captured in real time, and after the electric signal is amplified, filtered and other treatments, the electric signal is fed back to the antenna control system, which becomes an important basis for monitoring the brake state;

[0050] When the arc-shaped clamping plate 92 and the horizontal rotating shaft 5 and the pitching rotating shaft 12 do not appear wear or the wear degree is small, the distance between the arc-shaped clamping plate 92 and the horizontal rotating shaft 5 and the pitching rotating shaft 12 is kept in a reasonable range when the arc-shaped clamping plate 92 is moved during braking, for example, the distance between the inner side of the arc-shaped clamping plate 92 and the surface of the horizontal rotating shaft 5 and the pitching rotating shaft 12 is stabilized at 1-3 mm, at this time, the position of the conductive block 962 on the resistance rod 964 is relatively fixed, and the current in the circuit is increased to a certain interval, for example, maintained at 2-4 amperes, if the arc-shaped clamping plate 92 is worn due to long-term friction, the thickness of the arc-shaped clamping plate 92 is thinned, and the arc-shaped clamping plate 92 needs to move a farther distance to contact the horizontal rotating shaft 5 and the pitching rotating shaft 12 during braking, so that the distance between the arc-shaped clamping plate 92 and the horizontal rotating shaft 5 and the pitching rotating shaft 12 exceeds 1-3 mm, for example, reaches 4-6 mm, correspondingly, the sliding distance of the conductive block 962 on the resistance rod 964 is increased, the resistance connected to the circuit is further reduced, and the current will exceed the previous interval, for example, rises to 5-7 amperes, this abnormal change of current can be quickly identified by the antenna control system, the system automatically triggers the alarm device immediately, and sound and light alarms are issued or maintenance prompts are pushed to the background management system, so that the worn arc-shaped clamping plate 92 is replaced in time, and the protection of the horizontal rotating shaft 5 and the pitching rotating shaft 12 is affected due to the decline of the braking effect.

[0051] The above only describes the preferred embodiments of the present application, and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An antenna turntable for low-Earth orbit satellite communication, comprising a base (1), a U-shaped support frame (2), and an antenna mounting frame (3), characterized in that, Also includes: The first fixed cylinder (4) is fixedly installed on the top of the base (1). The top of the first fixed cylinder (4) is rotatably provided with a horizontal rotating shaft (5). The upper end of the horizontal rotating shaft (5) is fixedly connected to the U-shaped support frame (2). The bottom inner wall of the first fixed cylinder (4) is fixedly provided with a horizontal motor (6). The output end of the horizontal motor (6) is provided with a transmission mechanism (7) between the horizontal rotating shaft (5). The first torque sensor (8) is fixedly installed on the bottom inner wall of the first fixed cylinder (4), and the rotating end of the first torque sensor (8) is fixedly connected to the lower end of the horizontal rotating shaft (5). The first electromagnetic braking mechanism (9) is fixedly disposed inside the first fixed cylinder (4), and the first electromagnetic braking mechanism (9) is located on the axial wall of the horizontal rotating shaft (5). The first electromagnetic braking mechanism (9) includes a shielding cylinder (91) fixedly disposed inside the first fixed cylinder (4). Two arc-shaped clamps (92) are symmetrically disposed inside the shielding cylinder (91). Two elastic telescopic rods (93) are symmetrically fixed between the opposite sides of the two arc-shaped clamps (92) and the inner wall of the shielding cylinder (91). Permanent magnet blocks (94) are fixedly disposed on the outer side walls of the two arc-shaped clamps (92). The inner side wall of the shielding cylinder (91) and the two permanent magnet blocks (94) are fixedly disposed on the outer side walls of the two arc-shaped clamps (92). Electromagnetic blocks (95) are fixedly provided at corresponding positions. Wear detection mechanism (96) is provided between the side walls of the two arc-shaped clamps (92) and the inner wall of the shielding cylinder (91). The wear detection mechanism (96) includes an insulating connecting rod (961) fixedly provided on the outer side wall of the arc-shaped clamp (92). A conductive block (962) is fixedly provided at the end of the insulating connecting rod (961) away from the arc-shaped clamp (92). An L-shaped fixing plate (963) is fixedly provided on the inner side wall of the shielding cylinder (91). A resistance rod (964) is fixedly provided inside the L-shaped fixing plate (963). The conductive block (962) is slidably provided on the rod wall of the resistance rod (964). The second fixed cylinder (10) is fixedly installed on the side wall of the U-shaped support frame (2), and the pitch motor (11) is fixedly installed inside the second fixed cylinder (10). The pitch rotation shaft (12) is rotatably installed inside the U-shaped support frame (2). One end of the pitch rotation shaft (12) is fixedly connected to the output end of the pitch motor (11). The antenna mounting bracket (3) is fixedly installed on the shaft wall of the pitch rotation shaft (12). The third fixed cylinder (13) is fixedly installed on the side wall of the U-shaped support frame (2), and the second torque sensor (14) is fixedly installed inside the third fixed cylinder (13). The rotating end of the second torque sensor (14) is fixedly connected to one end of the pitch rotation shaft (12). The second electromagnetic braking mechanism (15) is fixedly installed on the side wall of the U-shaped support frame (2), and the second electromagnetic braking mechanism (15) is located inside the third fixed cylinder (13) and on the shaft wall of the pitch rotation shaft (12). The structure of the second electromagnetic braking mechanism (15) is the same as that of the first electromagnetic braking mechanism (9). The first lubrication mechanism (16) is located on the top of the first fixed cylinder (4); The second lubrication mechanism (17) is located inside the U-shaped support frame (2).

2. An antenna turntable for low-Earth orbit satellite communication according to claim 1, characterized in that, The transmission mechanism (7) includes a first gear (71) fixedly mounted on the output end of the horizontal motor (6), and a second gear (72) fixedly mounted on the shaft wall of the horizontal rotating shaft (5). The first gear (71) and the second gear (72) are meshed together.

3. An antenna turntable for low-Earth orbit satellite communication according to claim 1, characterized in that, The first fixed cylinder (4) is fixedly provided with a support plate (18), and the shielding cylinder (91) is fixedly provided on the upper surface of the support plate (18). The horizontal rotating shaft (5) and the shielding cylinder (91) are rotatably connected by a sealing element. The side wall of the first fixed cylinder (4) and above the support plate (18) are provided with a drain hole (19).

4. An antenna turntable for low-Earth orbit satellite communication according to claim 1, characterized in that, The first lubrication mechanism (16) includes a first liquid storage tank (161) fixedly disposed on the top of the first fixed cylinder (4), a first liquid supply pipe (162) extending from the inside of the first liquid storage tank (161), a first hollow disk (163) fixedly disposed on the top of the first fixed cylinder (4) and outside the horizontal rotating shaft (5), a first liquid supply pipe (162) being fixedly connected to the side wall of the first hollow disk (163) at one end away from the first liquid storage tank (161), and a plurality of evenly distributed first liquid outlet holes (164) being opened on the lower surface of the first hollow disk (163).

5. An antenna turntable for low-Earth orbit satellite communication according to claim 1, characterized in that, The second lubrication mechanism (17) includes a second liquid storage tank (171) fixedly installed inside the U-shaped support frame (2). The second liquid storage tank (171) has second liquid supply pipes (172) extending outwards to both sides. The inner walls of both sides of the U-shaped support frame (2) and the outside of the pitch rotation axis (12) are fixedly provided with second hollow disks (173). The ends of the two second liquid supply pipes (172) away from the second liquid storage tank (171) are respectively fixedly connected to the side walls of the two second hollow disks (173). The sides of the two second hollow disks (173) are provided with a plurality of evenly distributed second liquid outlet holes (174).

6. An antenna turntable for low-Earth orbit satellite communication according to claim 1, characterized in that, The side walls of the first fixed cylinder (4) and the second fixed cylinder (10) are both provided with heat dissipation windows (20).

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