CN110600853A - Novel antenna winding and unwinding device - Google Patents
Novel antenna winding and unwinding device Download PDFInfo
- Publication number
- CN110600853A CN110600853A CN201911027283.8A CN201911027283A CN110600853A CN 110600853 A CN110600853 A CN 110600853A CN 201911027283 A CN201911027283 A CN 201911027283A CN 110600853 A CN110600853 A CN 110600853A
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- gear
- antenna
- worm
- unwinding device
- bevel gear
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- 238000004804 winding Methods 0.000 title claims abstract description 27
- 230000005540 biological transmission Effects 0.000 claims description 40
- 238000006243 chemical reaction Methods 0.000 claims description 21
- 230000017525 heat dissipation Effects 0.000 claims description 7
- 238000003466 welding Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000001902 propagating effect Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/08—Means for collapsing antennas or parts thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
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- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
The invention discloses a novel antenna winding and unwinding device, relates to the technical field of antenna winding and unwinding devices, and solves the problems that the position precision is low, the control mode is single, the antenna winding and unwinding device can only be driven by electric power, and the device cannot work when power is off or the device fails. The invention can control the fluctuation of the antenna by installing the manual actuating mechanism, the electric actuating mechanism and the proximity switch, has high position precision, can operate under the condition of power failure or system failure and improves the utilization rate of equipment.
Description
Technical Field
The invention relates to the technical field of antenna winding and unwinding devices, in particular to a novel antenna winding and unwinding device.
Background
With the rapid development of socio-economic, an antenna is a transducer that transforms a guided wave propagating on a transmission line into an electromagnetic wave propagating in an unbounded medium (usually free space) or vice versa, a component for transmitting or receiving an electromagnetic wave in a radio device. Engineering systems such as radio communication, broadcasting, television, radar, navigation, electronic countermeasure, remote sensing, radio astronomy and the like all use electromagnetic waves to transmit information and work by depending on antennas. In addition, in the aspect of transmitting energy by electromagnetic waves, non-signal energy radiation also requires an antenna, and the common antenna has reversibility, namely the same secondary antenna can be used as a transmitting antenna and a receiving antenna, the basic characteristic parameters of the same antenna for transmitting or receiving are the same, and the antenna folding and unfolding device is a device for folding and unfolding the antenna.
However, when the existing antenna winding and unwinding device winds and unwinds an antenna, the winding and unwinding position precision is low, the control mode is single, the antenna winding and unwinding device can only be driven by electric power, and the antenna winding and unwinding device cannot work when the equipment is powered off or fails; therefore, the existing requirements are not met, and a novel antenna folding and unfolding device is provided for the requirements.
Disclosure of Invention
The invention aims to provide a novel antenna folding and unfolding device, which aims to solve the problems that the existing antenna folding and unfolding device in the background technology is low in antenna folding and unfolding position precision, single in control mode, capable of being driven only by electric power, incapable of working when equipment is powered off or in fault and the like when the antenna is folded and unfolded.
In order to achieve the purpose, the invention provides the following technical scheme: a novel antenna winding and unwinding device comprises an antenna winding and unwinding control box and a winding and unwinding actuator, wherein a manual actuating mechanism and an electric actuating mechanism are arranged inside the winding and unwinding actuator, the electric actuating mechanism comprises a stepping motor, a stepping motor gear is arranged at the front end of the stepping motor, a worm power gear is arranged on one side of the stepping motor gear, a worm is arranged inside the worm power gear, a turbine is arranged outside one end of the worm, an upright post is arranged inside the turbine, an upright post bevel gear is arranged at the upper end of the upright post, a transmission bevel gear is arranged on one side of the upright post bevel gear, a conversion gear is arranged on the rear side of the transmission bevel gear, an antenna relief gear is arranged on one side of the conversion gear, a bearing is arranged inside the antenna relief gear, and a limit post is arranged in front of, and an antenna mounting seat is installed at the upper end of the limiting column.
Preferably, manual actuating mechanism includes the manual rotatory cap, the pivot is installed to one side of manual rotatory cap, power gear is installed to the one end of pivot, drive gear is installed to one side of power gear, drive gear's internally mounted has the transmission shaft.
Preferably, square blocks are installed at two ends of the bearing, a rotary table is installed on the outer side of one square block, and a limiting ring is installed on one side of the rotary table.
Preferably, two fixing pins are installed inside the conversion gear, and one end of each fixing pin penetrates through the conversion gear and extends into the transmission bevel gear.
Preferably, a heat dissipation cover is installed on the front end face of the retracting actuator, and an identification nameplate is installed below the heat dissipation cover.
Preferably, both ends of the worm extend into the wall of the box body of the retracting actuator, and both ends of the worm are provided with ball bearings.
Preferably, two toggle switches are installed on the front end face of the antenna folding and unfolding control box, function indicating lamps are installed above and below the toggle switches, and fuses are installed below the function indicating lamps.
Preferably, one end of the transmission shaft is fixedly provided with two protruding blocks through welding, and one end of the transmission shaft penetrates through the housing of the retractable actuator.
Preferably, a limiting support is installed above the limiting ring, two proximity switches are installed inside the limiting support, and a laser sensor is installed inside the proximity switches.
Preferably, two limiting rods are installed on the outer side of the rotary table, and a stop block is fixedly installed on the outer surface of the limiting ring.
Compared with the prior art, the invention has the beneficial effects that: (1) the invention drives the gear of the stepping motor to rotate by electrifying the stepping motor so that the worm power gear drives the worm to rotate, the worm rotates to drive the worm wheel and the upright bevel gear fixedly arranged on the upright post together with the worm wheel to rotate, the upright bevel gear drives the transmission bevel gear and the conversion gear fixedly connected with the transmission bevel gear by a fixed pin to rotate when rotating, the conversion gear drives the bearing to rotate by rotating the undulation gear of the antenna, the bearing drives the square blocks at the two ends of the bearing to rotate when rotating, one square block drives the limiting post, the antenna mounting seat and the antenna fixed on the antenna mounting seat to rotate so that the antenna is gradually lifted, the other square block drives the turntable and two limiting rods fixedly arranged on the outer side of the turntable to rotate until one limiting rod is blocked by the stop block arranged on the outer side of the limiting ring, at the moment, a laser sensor in one of two proximity switches arranged in a limiting bracket reads the position information of a limiting rod, the model is fed back to a PLC terminal in an antenna retraction control box, the PLC terminal stops supplying power to a stepping motor after processing, the stepping motor stops rotating to enable an antenna to be in a rising state, otherwise, when the antenna is in a non-horizontal state, the other toggle switch is toggled to a function indicating lamp marked with a descending function, the stepping motor is electrified and reversely rotated to enable the antenna to gradually descend, a laser sensor in one of the two proximity switches arranged in the limiting bracket reads the position information of the limiting rod and feeds the model back to the PLC terminal in the antenna retraction control box, the PLC terminal stops supplying power to the stepping motor after processing, the stepping motor stops rotating to enable the antenna to be in a final position state of descending, and the position precision of the antenna retraction device is high, a non-contact proximity switch is used for electrical limiting, and the precision is higher than that of a contact limiting mode and is within +/-2 degrees.
(2) When a mechanical system fails, a straight screwdriver is inserted into a straight clamping groove on the outer surface of a manual rotating cap, the straight screwdriver is used for driving the manual rotating cap and a rotating shaft penetrating through the interior of the manual rotating cap to rotate, so that a power gear fixedly arranged at the end part of the rotating shaft drives a transmission gear and a transmission shaft to rotate, the transmission shaft drives a worm to rotate, the worm rotates to drive a turbine and an upright post bevel gear fixedly arranged on an upright post together with the turbine to rotate, the upright post bevel gear rotates to drive the transmission bevel gear and a conversion gear fixedly connected with the transmission bevel gear through a fixed pin, the conversion gear drives a bearing to rotate through the rotation of an antenna fluctuating gear, the bearing rotates to drive square blocks at two ends of the bearing to rotate, and one square block rotates to drive a limiting post, an antenna mounting seat and an antenna fixed on the antenna mounting seat to rotate, the antenna state may be manually adjusted.
Drawings
Fig. 1 is a schematic structural view of the whole of the present invention.
Fig. 2 is a schematic structural diagram of the manual actuator of the present invention.
Fig. 3 is a schematic structural diagram of the electric actuator according to the present invention.
FIG. 4 is a cross-sectional view of the retraction actuator of the present invention.
Fig. 5 is a partial structural sectional view of a propeller shaft according to the present invention.
Fig. 6 is a partial structural sectional view of the switching gear of the present invention.
In the figure: 1. an antenna deploying and retracting control box; 2. retracting and releasing the actuator; 3. a function indicator light; 4. a toggle switch; 5. a fuse; 6. a limiting column; 7. an antenna mounting base; 8. a manual actuator; 801. manually rotating the cap; 802. a rotating shaft; 803. a power gear; 804. a transmission gear; 805. a drive shaft; 9. an electric actuator; 901. a stepping motor; 902. a stepper motor gear; 903. a worm power gear; 904. a worm; 905. a turbine; 906. a column; 907. an upright post bevel gear; 908. a drive bevel gear; 909. a switching gear; 910. a square block; 911. an antenna relief gear; 912. a bearing; 10. a limiting rod; 11. a limiting ring; 12. a proximity switch; 13. a stopper; 14. a turntable; 15. and a limiting bracket.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1 to 6, an embodiment of the present invention includes: a novel antenna winding and unwinding device comprises an antenna winding and unwinding control box 1 and a winding and unwinding actuator 2, wherein a manual actuator 8 and an electric actuator 9 are arranged inside the winding and unwinding actuator 2, the winding and unwinding of an antenna can be realized, and the data reception of the antenna is ensured, the electric actuator 9 comprises a stepping motor 901, a stepping motor gear 902 is arranged at the front end of the stepping motor 901, a worm power gear 903 is arranged on one side of the stepping motor gear 902, a worm 904 is arranged inside the worm power gear 903, a worm 904 is arranged inside the worm power gear 904, a worm wheel 905 is arranged outside one end of the worm 904, a stand 906 is arranged inside the worm wheel 905, a stand bevel gear 907 is arranged at the upper end of the stand 906, a transmission bevel gear 908 is arranged on one side of the stand bevel gear 907, a conversion gear 909 is arranged on the rear side of the transmission bevel gear 908, an antenna, spacing post 6 is installed in the place ahead of receiving and releasing executor 2, can drive antenna mount pad 7 and antenna and rotate, realizes undulant, and antenna mount pad 7 is installed to spacing post 6's upper end, and the installation and the fixing of the antenna of being convenient for are convenient for change.
The manual actuating mechanism 8 comprises a manual rotating cap 801, a rotating shaft 802 is installed on one side of the manual rotating cap 801, a power gear 803 is installed on one end of the rotating shaft 802, a transmission gear 804 is installed on one side of the power gear 803, and a transmission shaft 805 is installed inside the transmission gear 804, so that manual control can be performed, and the device can work when power is off.
Square blocks 910 are arranged at two ends of the bearing 912, a rotary table 14 is arranged on the outer side of one square block 910, a limiting ring 11 is arranged on one side of the rotary table 14, the square block 910 can realize fluctuation of the antenna, and the structure is simple and the operation is convenient.
Two fixing pins are installed inside the conversion gear 909, and one end of each fixing pin penetrates through the conversion gear 909 and extends into the transmission bevel gear 908, so that the conversion gear 909 and the transmission bevel gear 908 can operate synchronously.
The front end face of the retracting actuator 2 is provided with a heat dissipation cover, the lower part of the heat dissipation cover is provided with an identification nameplate, the heat dissipation cover can dissipate internal heat, and the safety of internal elements of the device is protected.
Both ends of the worm 904 extend into the wall of the box for receiving and releasing the actuator 2, and ball bearings are mounted at both ends of the worm 904, so that the worm 904 can freely rotate, and the operation of the device is realized.
Two toggle switches 4 are installed to the preceding terminal surface of antenna receive and release control box 1, and function pilot lamp 3 is all installed to toggle switch 4's upper and lower side, and fuse 5 is installed to the below of two function pilot lamps 3 wherein, and fuse 5 protects the device circuit, guarantees the safety of device.
One end of the transmission shaft 805 is fixed with two protruding blocks by welding, one end of the transmission shaft 805 penetrates through the housing of the retractable actuator 2, and the transmission shaft 805 can drive the worm 904 to rotate through the protruding blocks, so that manual control is realized.
Spacing support 15 is installed to the top of spacing ring 11, and the internally mounted of spacing support 15 has two proximity switch 12, and the internally mounted of proximity switch 12 has laser sensor, can monitor the positional information of gag lever post 10, feeds back to the PLC terminal, and then the PLC terminal can control the fluctuation state of antenna.
Two stop levers 10 are installed in the outside of carousel 14, and the outer fixed surface of spacing ring 11 installs dog 13, and mutually supporting of dog 13 and stop lever 10 can guarantee that the antenna can fluctuate smoothly.
When the antenna deploying and retracting control box is used, firstly, one of the toggle switches 4 arranged on the front end face of the antenna deploying and retracting control box 1 is toggled to start a power supply of the deploying and retracting actuator 2, when a lamp indicating the power supply in the function indicator lamp 3 is turned on, the power supply of the deploying and retracting actuator 2 is turned on, when an antenna arranged on the antenna mounting seat 7 is in a horizontal state, the other toggle switch 4 is toggled to the function indicator lamp 3 marked with lift, at the moment, the step motor 901 is electrified to drive the step motor gear 902 to rotate, so that the worm power gear 903 drives the worm 904 to rotate, the worm 904 rotates to drive the worm gear 905 and a vertical column bevel gear 907 fixedly arranged on the vertical column 906 together with the worm gear 905 to rotate, when the vertical column bevel gear 907 rotates, the transmission bevel gear 908 and a conversion gear 909 fixedly connected with the transmission bevel gear 908 through a fixed pin rotate, the, when the bearing 912 rotates, the square blocks 910 at two ends of the bearing 912 are driven to rotate, when one square block 910 rotates, the limiting column 6, the antenna mounting seat 7 and the antenna fixed on the antenna mounting seat 7 are driven to rotate, so that the antenna gradually rises, the other square block 910 drives the rotary table 14 and the two limiting rods 10 fixedly mounted on the outer side of the rotary table 14 to rotate until one limiting rod 10 is blocked by the stop block 13 mounted on the outer side of the limiting ring 11, at the moment, the laser sensor inside one of the two proximity switches 12 mounted inside the limiting bracket 15 reads the position information of the limiting rod 10, the model is fed back to the PLC terminal inside the antenna retraction control box 1, after the PLC terminal is processed, the power supply to the stepping motor 901 is stopped, the stepping motor 901 stops rotating, so that the antenna is in a rising state, otherwise, when the antenna is in a non-horizontal state, the other toggle switch 4 is toggled to the function indicating lamp 3 marked to, at this time, the stepping motor 901 is electrified to rotate reversely, the worm 904 rotates to drive the worm wheel 905 and the upright bevel gear 907 fixedly installed on the upright 906 together with the worm wheel 905 to rotate, the upright bevel gear 907 rotates to drive the transmission bevel gear 908 and the conversion gear 909 fixedly connected with the transmission bevel gear 908 through a fixed pin, the conversion gear 909 rotates to drive the bearing 912 to rotate through rotating the antenna wave gear 911, the bearing 912 rotates to drive the square blocks 910 at two ends of the bearing 912 to rotate, one square block 910 rotates to drive the spacing column 6, the antenna installation seat 7 and the antenna fixed on the antenna installation seat 7 to rotate, so that the antenna gradually descends, the other square block 910 drives the turntable 14 and the two spacing rods 10 fixedly installed on the outer side of the turntable 14 to rotate until one spacing rod 10 is blocked by the block 13 installed on the outer side of the spacing ring 11, at this time, a laser sensor inside one of two proximity switches 12 installed inside a limit bracket 15 reads position information of a limit rod 10, the type is fed back to a PLC terminal inside an antenna retraction control box 1, power supply to a stepping motor 901 is stopped after the PLC terminal is processed, the stepping motor 901 stops rotating, so that the antenna is in a final position state of descending, when a mechanical system fails in an electric power system, a straight screwdriver is inserted into a straight clamping groove on the outer surface of a manual rotating cap 801, the straight screwdriver is used to drive the manual rotating cap 801 and a rotating shaft 802 penetrating through the manual rotating cap 801 to rotate, a power gear 803 fixedly installed at the end of the rotating shaft 802 drives a transmission gear 804 and a transmission shaft 805 to rotate, the transmission shaft 805 drives a worm 904 to rotate, the worm rotates to drive the worm 905 and a vertical column bevel gear 907 fixedly installed on a vertical column 906 with the worm 905 and the worm 905, the upright post bevel gear 907 can drive the transmission bevel gear 908 and the conversion gear 909 fixedly connected with the transmission bevel gear 908 through a fixing pin to rotate when rotating, the conversion gear 909 can drive the bearing 912 to rotate by rotating the antenna relief gear 911, the bearing 912 can drive the square blocks 910 at two ends of the bearing to rotate when rotating, one square block 910 can drive the limiting column 6, the antenna mounting seat 7 and an antenna fixed on the antenna mounting seat 7 to rotate when rotating, the state of the antenna can be manually adjusted, the structure is simple, and the operation is convenient.
Claims (10)
1. The utility model provides a novel antenna receive and releases device, includes antenna receive and releases control box (1) and receive and release executor (2), its characterized in that: a manual actuating mechanism (8) and an electric actuating mechanism (9) are installed inside the retractable actuator (2), the electric actuating mechanism (9) comprises a stepping motor (901), a stepping motor gear (902) is installed at the front end of the stepping motor (901), a worm power gear (903) is installed on one side of the stepping motor gear (902), a worm (904) is installed inside the worm power gear (903), a worm wheel (905) is installed on the outer side of one end of the worm (904), a stand column (906) is installed inside the worm wheel (905), a stand column bevel gear (907) is installed at the upper end of the stand column (906), a transmission bevel gear (908) is installed on one side of the stand column bevel gear (907), a conversion gear (909) is installed on the rear side of the transmission bevel gear (908), and an antenna fluctuating gear (911) is installed on one side of the conversion gear (909), the antenna is characterized in that a bearing (912) is mounted inside the antenna relief gear (911), a limiting column (6) is mounted in front of the retractable actuator (2), and an antenna mounting seat (7) is mounted at the upper end of the limiting column (6).
2. The novel antenna winding and unwinding device of claim 1, wherein: manual actuating mechanism (8) are including manual rotatory cap (801), pivot (802) are installed to one side of manual rotatory cap (801), power gear (803) are installed to the one end of pivot (802), drive gear (804) are installed to one side of power gear (803), the internally mounted of drive gear (804) has transmission shaft (805).
3. The novel antenna winding and unwinding device of claim 1, wherein: square piece (910) are all installed at the both ends of bearing (912), and carousel (14) are installed in the outside of one of them square piece (910), spacing ring (11) are installed to one side of carousel (14).
4. The novel antenna winding and unwinding device of claim 1, wherein: two fixed pins are arranged in the conversion gear (909), and one end of each fixed pin penetrates through the conversion gear (909) and extends into the transmission bevel gear (908).
5. The novel antenna winding and unwinding device of claim 1, wherein: the front end face of the retraction actuator (2) is provided with a heat dissipation cover, and a sign nameplate is arranged below the heat dissipation cover.
6. The novel antenna winding and unwinding device of claim 1, wherein: both ends of the worm (904) extend into the wall of the box body of the retractable actuator (2), and both ends of the worm (904) are provided with ball bearings.
7. The novel antenna winding and unwinding device of claim 1, wherein: two toggle switches (4) are installed to the preceding terminal surface of antenna receive and release control box (1), function pilot lamp (3) are all installed to the upper and lower below of toggle switch (4), wherein two fuse (5) are installed to the below of function pilot lamp (3).
8. The novel antenna winding and unwinding device of claim 2, wherein: two protruding blocks are fixed at one end of the transmission shaft (805) through welding, and one end of the transmission shaft (805) penetrates through a shell of the retractable actuator (2).
9. A novel antenna retraction and release device as claimed in claim 3, characterised in that: spacing support (15) are installed to the top of spacing ring (11), the internally mounted of spacing support (15) has two proximity switch (12), the internally mounted of proximity switch (12) has laser sensor.
10. A novel antenna retraction and release device as claimed in claim 3, characterised in that: two limiting rods (10) are installed on the outer side of the rotary table (144), and a stop block 13 is fixedly installed on the outer surface of the limiting ring (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911027283.8A CN110600853B (en) | 2019-10-27 | 2019-10-27 | Novel antenna winding and unwinding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911027283.8A CN110600853B (en) | 2019-10-27 | 2019-10-27 | Novel antenna winding and unwinding device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110600853A true CN110600853A (en) | 2019-12-20 |
| CN110600853B CN110600853B (en) | 2024-04-05 |
Family
ID=68850593
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911027283.8A Active CN110600853B (en) | 2019-10-27 | 2019-10-27 | Novel antenna winding and unwinding device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110600853B (en) |
Citations (8)
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|---|---|---|---|---|
| US4875053A (en) * | 1987-09-30 | 1989-10-17 | Harada Kogyo Kabushiki Kaisha | Drive control device for an electrically-driven extending and retracting antenna |
| CN203300802U (en) * | 2013-05-10 | 2013-11-20 | 北京航天光华电子技术有限公司 | Satellite antenna elevation transmission device |
| CN205844520U (en) * | 2016-06-06 | 2016-12-28 | 江西佳时特数控技术有限公司 | radar monitoring device |
| CN107069175A (en) * | 2016-12-01 | 2017-08-18 | 江西中船航海仪器有限公司 | A kind of compact type vehicle-mounted antenna hoisting gear |
| CN107369877A (en) * | 2017-09-19 | 2017-11-21 | 北京电子工程总体研究所 | A kind of car antenna control system |
| CN206850025U (en) * | 2017-05-16 | 2018-01-05 | 泉州市歌天电子商务有限公司 | A kind of protection type satellite signal receiving communication antenna |
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| CN210576379U (en) * | 2019-10-27 | 2020-05-19 | 江西中船航海仪器有限公司 | Novel antenna winding and unwinding device |
-
2019
- 2019-10-27 CN CN201911027283.8A patent/CN110600853B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4875053A (en) * | 1987-09-30 | 1989-10-17 | Harada Kogyo Kabushiki Kaisha | Drive control device for an electrically-driven extending and retracting antenna |
| CN203300802U (en) * | 2013-05-10 | 2013-11-20 | 北京航天光华电子技术有限公司 | Satellite antenna elevation transmission device |
| CN205844520U (en) * | 2016-06-06 | 2016-12-28 | 江西佳时特数控技术有限公司 | radar monitoring device |
| CN107069175A (en) * | 2016-12-01 | 2017-08-18 | 江西中船航海仪器有限公司 | A kind of compact type vehicle-mounted antenna hoisting gear |
| CN206850025U (en) * | 2017-05-16 | 2018-01-05 | 泉州市歌天电子商务有限公司 | A kind of protection type satellite signal receiving communication antenna |
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| Title |
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| Publication number | Publication date |
|---|---|
| CN110600853B (en) | 2024-04-05 |
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