Auxiliary reflecting surface electric lifting assembly and antenna

Abstract

The invention discloses a subreflector electric lifting assembly and an antenna, and belongs to the technical field of antennas. The auxiliary reflecting surface electric lifting assembly comprises a bottom plate, a driving motor, two reversing transfer cases, a plurality of right-angle commutators, three linear executing mechanisms and a connecting plate. A driving motor divides power into two paths through a first reversing transfer case, and one path drives a first linear execution mechanism through a first vertical right-angle reverser; and the other path sequentially passes through a first horizontal right-angle reverser and a second reversing transfer case for secondary distribution and steering, and finally drives a second linear actuating mechanism and a third linear actuating mechanism directly and respectively through a second horizontal right-angle reverser and a second vertical right-angle reverser. The three linear executing mechanisms stretch out and draw back synchronously to drive the connecting plate and the auxiliary reflecting surface to lift integrally and stably. The single driving motor is matched with the specific mechanical transmission chain, so that three-point rigid synchronous driving is realized, and the problems of inconvenience in manual lifting of the auxiliary reflecting surface of the vehicle-mounted antenna, poor synchronous precision of multiple motors and over-limit transportation are solved.

Description

A secondary reflector electric lifting assembly and antenna Technical Field

[0001] This application relates to the field of antenna equipment technology, and in particular to an electric lifting assembly for a sub-reflector and an antenna. Background Technology

[0002] Parabolic antennas, such as Cassegrain antennas and defocused antennas, are key equipment in fields such as satellite communications and radio astronomy. They typically consist of a primary reflector, a secondary reflector, and a feed.

[0003] With the development of mobile and emergency communications, the demand for vehicle-mounted parabolic antennas is increasing. These antennas are frequently transported by road or rail, therefore they must meet strict transport size restrictions, especially height restrictions. However, the subreflector of traditional parabolic antennas is usually fixed in front of the feed, and its height often exceeds the standard upper limit during transport. Therefore, the subreflector needs to have a height adjustment function.

[0004] Currently, existing technologies for raising and lowering sub-reflectors suffer from the following drawbacks: Low automation: Most rely on manual mechanical adjustment, making one-button electric operation impossible and resulting in low efficiency. Poor motion stability and synchronization: To achieve raising and lowering, some solutions employ multiple drive points. Using multiple motors for separate driving leads to complex control, high costs, and difficulty in ensuring absolute synchronization, potentially causing the sub-reflector to tilt or jam. Using a single motor with a simple transmission system makes it difficult to stably and accurately drive multiple raising and lowering points for strictly synchronized linear motion within a compact space, especially failing to guarantee the positional accuracy of the sub-reflector in horizontal or tilted non-vertical transport conditions.

[0005] Therefore, there is an urgent need in this field for a drive device for lifting and lowering the sub-reflector, which can synchronously and smoothly drive multiple linear actuators through a single drive source and a compact and reliable pure mechanical transmission chain, thereby achieving high-precision linear lifting and lowering of the entire sub-reflector and meeting the dual requirements of vehicle transportation and working use. Summary of the Invention

[0006] This invention aims to overcome the shortcomings of the prior art and provide a compact, highly accurate, stable, and modularly maintainable electric lifting assembly and antenna for the sub-reflector. The technical solution is as follows:

[0007] According to a first aspect of the present invention, an electric lifting assembly for a secondary reflector is provided, characterized in that it comprises: a base plate; a drive motor fixed to the base plate; a first commutator and a second commutator fixed to the base plate and used to synchronously distribute the rotational power of a single input shaft to two output shafts, wherein the two output shafts of the first commutator are collinearly arranged, and the two output shafts of the second commutator are perpendicular to each other; a first vertical right-angle commutator, a first horizontal right-angle commutator, a second horizontal right-angle commutator, and a second vertical right-angle commutator; a first linear actuator, a second linear actuator, and a third linear actuator; wherein the first linear actuator is vertically fixed to the first vertical right-angle commutator, the second linear actuator is vertically fixed to the second commutator, and the third linear actuator is vertically fixed to the second vertical right-angle commutator.

[0008] The first linear actuator, the second linear actuator, and the third linear actuator are circumferentially distributed around a central axis perpendicular to the base plate; a connecting plate is used to mount the secondary reflector; wherein, the output shaft of the drive motor is connected to the input shaft of the first commutator; one output shaft of the first commutator is connected to the input shaft of the first vertical right-angle commutator, and the output shaft of the first vertical right-angle commutator is connected to and drives the first linear actuator; the other output shaft of the first commutator is connected to the input shaft of the first horizontal right-angle commutator, and the output shaft of the first horizontal right-angle commutator is connected to the input shaft of the second commutator.

[0009] One output shaft of the second commutator is connected to and drives the second linear actuator; the other output shaft of the second commutator is connected to the input shaft of the second horizontal right-angle commutator, the output shaft of the second horizontal right-angle commutator is connected to the input shaft of the second vertical right-angle commutator, and the output shaft of the second vertical right-angle commutator is connected to and drives the third linear actuator.

[0010] The linear output ends of the first linear actuator, the second linear actuator, and the third linear actuator are all fixedly connected to the connecting plate.

[0011] Optionally, the input shaft of the first reversing transfer case is perpendicular to the base plate; and the output shaft of the second reversing transfer case used to drive the second linear actuator is perpendicular to the base plate.

[0012] Optionally, the electric lifting assembly of the secondary reflector also includes a first reinforcing plate, which fixes the ends of the first linear actuator, the second linear actuator, and the third linear actuator away from the base plate, and the linear output ends of the first linear actuator, the second linear actuator, and the third linear actuator protrude from the first reinforcing plate.

[0013] Optionally, the electric lifting assembly for the secondary reflector also includes a guide mechanism, which includes at least three guide rods and linear bearings mounted on the connecting plate, each corresponding to one of the guide rods. The linear bearings are sleeved on the corresponding guide rods.

[0014] Optionally, one end of each guide rod near the base plate is fixed to the base plate or the first reinforcing plate.

[0015] Optionally, the guiding mechanism further includes a second reinforcing plate; one of the guide rods is connected to the first reinforcing plate at one end near the base plate, and the other two guide rods are connected to the base plate at one end near the base plate.

[0016] Optionally, the sub-reflector electric lifting assembly also includes an encoder, which is mounted on the output shaft of the drive motor or any of the drive shafts in the mechanical transmission chain.

[0017] Optionally, the base plate and the connecting plate are respectively provided with mounting through holes for the feed source to pass through. The drive motor, the first commutator, the second commutator, the first vertical right-angle commutator, the first horizontal right-angle commutator, the second horizontal right-angle commutator, the second vertical right-angle commutator, the first linear actuator, the second linear actuator, and the third linear actuator are all arranged in the annular space defined by the mounting through hole and the base plate.

[0018] Optionally, the secondary reflector is connected to the connecting plate via multiple connecting legs, and the secondary reflector and the multiple connecting legs together constitute a detachable secondary reflector module; the base plate, the drive motor, the first commutator, the second commutator, the first vertical right-angle commutator, the first horizontal right-angle commutator, the second horizontal right-angle commutator, the second vertical right-angle commutator, the first linear actuator, the second linear actuator, the third linear actuator, and the guide mechanism together constitute a lifting module; the secondary reflector module and the lifting module are detachably connected.

[0019] According to a second aspect of the present invention, an antenna is also provided, the antenna including a main reflector, a feed source and a sub-reflector, and further including a motorized lifting assembly for the sub-reflector as described above, the feed source being mounted on the base plate and passing through a mounting through hole in the connecting plate, and the sub-reflector being mounted on the connecting plate and located in front of the feed source.

[0020] The beneficial effects of the technical solutions provided in this application include at least the following:

[0021] Automatic electric lifting of the sub-reflector surface is achieved, meeting the requirements of height restrictions and rapid deployment and retrieval in vehicle transportation. Purely mechanical rigid synchronous transmission ensures the synchronization accuracy and smoothness of the three lifting points, avoiding the risk of asynchronous control by multiple motors. The overall ring layout and modular design facilitate adaptation to different feed sources and rapid maintenance and replacement. The structure has good rigidity and can adapt to complex vehicle postures. Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 is a perspective view of the sub-reflector electric lifting assembly provided in an embodiment of this application from a first-view perspective;

[0024] Figure 2 is a perspective view of the electric lifting assembly of the sub-reflector surface provided in the embodiment of this application from a second perspective;

[0025] Figure 3 is a schematic diagram showing the distribution of the base plate, first commutator, second commutator, first vertical right-angle commutator, first horizontal right-angle commutator, second horizontal right-angle commutator, and second vertical right-angle commutator of the electric lifting assembly for the secondary reflector provided in the embodiment of this application.

[0026] Explanation of reference numerals in the attached figures

[0027] 1-Base plate; 2-Drive motor; 3-First commutator transfer case; 4-Second commutator transfer case; 5-First vertical right-angle commutator; 6-First horizontal right-angle commutator; 7-Second horizontal right-angle commutator; 8-Second vertical right-angle commutator; 9-First linear actuator; 10-Second linear actuator; 11-Third linear actuator; 12-Connecting plate; 13-Secondary reflector; 14-Guide rod; 15-Linear bearing; 16-Encoder; 17-First reinforcing plate; 18-Second reinforcing plate; 19-Connecting leg. Detailed Implementation

[0028] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0029] In this disclosure, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the relative positions of the corresponding components in the direction of gravity when they are in use, and "inner" and "outer" refer to their relative positions to the contours of the corresponding components themselves. Furthermore, the terms "first," "second," etc., used in this disclosure are for distinguishing one element from another and do not have sequential or importance implications. In the following description, when referring to the accompanying drawings, unless otherwise explained, the same reference numerals in different drawings denote the same or similar elements.

[0030] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0031] Firstly, the present invention provides an electric lifting assembly for a secondary reflector, the basic structure of which is built around a base plate 1, which serves as the installation foundation and support platform for the entire assembly.

[0032] Referring to Figures 1 to 3, a drive motor 2 is fixedly mounted on the base plate 1, serving as the power source for the entire system. Furthermore, a first commutator 3 and a second commutator 4 are also fixedly mounted on the base plate 1. Both the first commutator 3 and the second commutator 4 are designed to receive rotational power from a single input shaft and distribute it synchronously and proportionally to the two output shafts. Specifically, in a preferred embodiment of the invention, the two output shafts of the first commutator 3 are collinear, while the two output shafts of the second commutator 4 are perpendicular to each other. This different output shaft geometry design is crucial for adapting to complex spatial layouts and achieving specific power distribution paths.

[0033] Referring to Figure 3, the transmission system also includes four right-angle commutators: a first vertical right-angle commutator 5, a first horizontal right-angle commutator 6, a second horizontal right-angle commutator 7, and a second vertical right-angle commutator 8, all of which are fixed to the base plate 1. A first linear actuator 9, a second linear actuator 10, and a third linear actuator 11 serve as execution units. The first linear actuator 9 is fixed to the housing of the first vertical right-angle commutator 5, the second linear actuator 10 is fixed to the housing of the second commutator transfer case 4, and the third linear actuator 11 is fixed to the housing of the second vertical right-angle commutator 8. The first linear actuator 9, the second linear actuator 10, and the third linear actuator 11 are circumferentially distributed around a central axis perpendicular to the base plate 1.

[0034] Referring to Figures 1 and 2, a connecting plate 12 is used to mount the secondary reflector. The connecting plate 12 is fixedly connected to the linear output ends of the three linear actuators, such as the nuts or push rods in a lead screw and nut mechanism. The connection relationship of the entire transmission chain is as follows: The output shaft of the drive motor 2 is connected to the input shaft of the first commutator 3, thereby inputting power. One output shaft of the first commutator 3 is connected to the input shaft of the first vertical right-angle commutator 5, and drives the first linear actuator 9 after commutation. The other output shaft of the first commutator 3 is connected to the input shaft of the first horizontal right-angle commutator 6, and the power is transmitted to the input shaft of the second commutator 4 after horizontal commutation. The second commutator 4 divides the power into two: one vertical output shaft is directly connected to and drives the second linear actuator 10, and the other horizontal output shaft is connected in sequence to the second horizontal right-angle commutator 7 and the second vertical right-angle commutator 8, and finally drives the third linear actuator 11.

[0035] Through this interlocking transmission design, the rotational motion of a single drive motor 2 is converted into a fully synchronized linear extension and retraction motion of the first linear actuator 9, the second linear actuator 10, and the third linear actuator 11, thereby driving the connecting plate 12 and the secondary reflector 13 mounted on it to make precise overall lifting and lowering along the central axis.

[0036] This purely mechanical transmission scheme fundamentally eliminates the errors and delays that may be caused by electronic synchronization, ensuring high reliability. It requires only one drive motor and one control system, making it significantly cheaper than multi-motor schemes.

[0037] According to an embodiment of this application, in order to further improve the spatial certainty and installation convenience of the entire transmission system, in a preferred embodiment of the present invention, the critical axial direction of the two commutator transfer cases is defined.

[0038] Referring to Figure 3, specifically, the input shaft of the first reversing transfer case 3 is set perpendicular to the base plate 1. This setting allows the output shaft of the drive motor 2 to be naturally installed vertically, clearly defining the initial segment of power transmission. Simultaneously, the output shaft of the second reversing transfer case 4 used to drive the second linear actuator 10 is also set perpendicular to the base plate 1. This means that the second linear actuator 10 is directly driven by a vertical output shaft, requiring no additional direction conversion, resulting in the shortest transmission chain and the highest rigidity and efficiency. These two spatial orientations not only optimize the power transmission path and reduce unnecessary energy loss and potential deformation, but more importantly, they, together with the circumferential layout of the first linear actuator 9, the second linear actuator 10, and the third linear actuator 11, define an extremely stable and symmetrical mechanical structure, ensuring that the sub-reflector does not generate a deflection torque during lifting and lowering, and that the center point trajectory is always precisely aligned with the central axis.

[0039] According to an embodiment of this application, referring to Figures 1 and 2, in order to resist the potential top swaying of the first linear actuator 9, the second linear actuator 10, and the third linear actuator 11 when fully extended, and to enhance the rigidity of the entire lifting frame, a first reinforcing plate 17 is added. The first reinforcing plate 17 is located at the end of the three linear actuators away from the base plate 1, i.e., the top, and rigidly connects the housings or mounting bases of the first linear actuator 9, the second linear actuator 10, and the third linear actuator 11 together, forming a stable triangular or annular top frame. The linear output ends of each linear actuator, such as push rods, pass through corresponding holes in the first reinforcing plate 17 and connect to the connecting plate 12.

[0040] The first reinforcing plate 17 connects the first linear actuator 9, the second linear actuator 10, and the third linear actuator 11 into a whole, improving their ability to work together to resist lateral loads and ensuring that the extended sub-reflector still has extremely high positional stability and structural reliability in the event of vehicle bumps or strong winds.

[0041] According to embodiments of this application, referring to Figures 1 and 2, in order to ensure the linear accuracy and stability of the movement of the connecting plate 12 and the sub-reflective surface during lifting and lowering, and to prevent any slight swaying or jamming, the present invention also introduces a guiding mechanism. The guiding mechanism mainly includes at least three guide rods 14 and linear bearings 15 mounted on the connecting plate 12, corresponding one-to-one with these guide rods 14. Each guide rod 14 is fixedly mounted on the base plate 1 or the first reinforcing structure, and its extension direction is parallel to the central axis of the base plate 1, i.e., consistent with the direction of lifting and lowering movement. The linear bearings 15 sleeved on the guide rods 14 are fixedly connected to the connecting plate 12.

[0042] When the transmission system drives the connecting plate 12 to rise and fall, the linear bearing 15 slides along the guide rod 14. The cooperation between the guide rod 14 and the linear bearing 15 forms a high-precision sliding pair, which forces the connecting plate 12 to perform only pure translational motion along the central axis, eliminating the possibility of radial or circumferential displacement or rotation. This is crucial to ensuring that the center point of the sub-reflector 13 remains strictly aligned throughout the entire rising and falling process, thereby maximizing the protection of the antenna's final electrical performance from the influence of mechanical movement.

[0043] The introduction of the guide mechanism separates and professionally designs the driving force provided by the transmission system from the guiding function that ensures motion accuracy, so that the entire sub-reflector electric lifting assembly can maintain high motion accuracy even when subjected to lateral forces.

[0044] According to an embodiment of this application, referring to Figures 1 and 2, in order to provide a more stable and accurate installation reference for the guide mechanism and further improve the overall structural rigidity of the electric lifting assembly of the sub-reflector, the present invention may also include a second reinforcing plate 18.

[0045] In this embodiment, the fixing method of the guide rods 14 of the guiding mechanism is adaptively adjusted. Specifically, of the three guide rods 14, one guide rod 14 is connected to the first reinforcing plate 17 at the end near the base plate 1, while the other two guide rods 14 are connected to the base plate 1 at the end near the base plate 1. The second reinforcing plate 18 is usually also fixed to the base plate 1 or forms an integral part with the base plate 1. This design is because, in actual assembly, components often need to be moved from the outside to the space between the base plate 1 and the first reinforcing plate 17. Connecting one of the guide rods 14 to the first reinforcing plate 17 can create a larger entrance to the space between the base plate 1 and the first reinforcing plate 17, and has little impact on the guiding effect of the guide rod 14. This demonstrates the flexibility and practicality of the present invention in dealing with complex engineering constraints while ensuring core functionality.

[0046] According to an embodiment of this application, referring to Figures 1 and 2, in order to monitor and control the lifting position of the sub-reflector in real time and achieve precise fixed-point stopping and intelligent control, an encoder 16 is provided on the transmission chain. The encoder 16 can be flexibly installed on the output shaft of the drive motor 2 to directly monitor the number of rotations of the drive motor 2; it can also be installed on any transmission shaft in the mechanical transmission chain that can accurately reflect the lifting displacement of the final connecting plate 12, such as the input shaft of the first commutator 3 or the input shaft of a right-angle commutator. The encoder 16 feeds back the detected shaft rotation angle signal to the controller, which can then calculate and accurately determine the real-time height of the sub-reflector. Based on this feedback, the controller can control the drive motor 2 to stop at any preset position, thereby achieving precise stopping of the sub-reflector at the working position, transport position, or intermediate debugging position. This improves the ease of operation of the electric lifting assembly of the sub-reflector and the level of system intelligence. It is worth noting that the location of the encoder 16 is flexible, as long as there is a definite transmission ratio relationship between the shaft it monitors and the final lifting displacement, which provides convenience for the implementation of different structural layouts.

[0047] According to embodiments of this application, referring to Figures 1 and 2, a key design concept of this invention lies in space utilization and electromagnetic compatibility. To this end, the middle portion of the connecting plate 12 and the corresponding middle portion of the base plate 1 are both provided with mounting through holes for the feed source. More importantly, the drive motor 2, the first commutator 3, the second commutator 4, the first vertical right-angle commutator 5, the first horizontal right-angle commutator 6, the second horizontal right-angle commutator 7, the second vertical right-angle commutator 8, the first linear actuator 9, the second linear actuator 10, and the third linear actuator 11 are all arranged within an annular space defined by the mounting through holes and the outer edge of the base plate 1. In other words, all mechanical transmission and drive components are arranged in the annular area, leaving an unobstructed passage through the central mounting through hole. This passage is precisely for the feed source. The feed source can be fixed from below the base plate 1 and extend upwards, passing through the through hole without obstruction to reach its working position.

[0048] On the one hand, this hollow ring layout completely avoids the metal mechanical structure from blocking or interfering with the electromagnetic waves emitted or received by the feed, fundamentally ensuring the core electrical performance of the antenna; on the other hand, it makes it possible to quickly replace the feed. Because the central area is unobstructed, different types of feeds, such as Ka-band and Ku-band feeds, can be easily installed and replaced, allowing a single antenna to flexibly adapt to various mission requirements and greatly expanding its application range.

[0049] According to an embodiment of this application, referring to Figures 1 and 2, the entire sub-reflector electric lifting assembly is divided into two main modules: the sub-reflector module and the lifting module.

[0050] The sub-reflector module mainly includes the sub-reflector itself and multiple connecting legs 19 connecting the sub-reflector and the connecting plate 12. This is a relatively lightweight functional module with the reflector as its core.

[0051] The lifting module comprises almost all drive, transmission, and support structures, specifically including: base plate 1, drive motor 2, first commutator transfer case 3, second commutator transfer case 4, first vertical right-angle commutator 5, first horizontal right-angle commutator 6, second horizontal right-angle commutator 7, second vertical right-angle commutator 8, first linear actuator 9, second linear actuator 10, third linear actuator 11, and guide mechanism. This is a highly integrated and fully functional power and actuation module. The two modules are connected by a detachable connection method; for example, the connecting plate 12 is connected to the output end of the linear actuator using quick-release pins or bolts. When maintenance of the sub-reflector, replacement of the feed source, or separate debugging of the transmission system is required, the sub-reflector module can be quickly removed without disturbing the precision lifting module. This modular design significantly reduces maintenance complexity, shortens downtime, and allows for independent testing and optimization of the two modules.

[0052] Secondly, the present invention also provides an antenna. This antenna includes a conventional main reflector, a feed, and a sub-reflector, and further includes a motorized lifting assembly for the sub-reflector as described in the first aspect. In this antenna, the feed is mounted on the base plate 1 of the motorized lifting assembly for the sub-reflector, and its radiating end extends upward through the connecting plate 12 and the mounting through-hole in the middle of the base plate 1. The sub-reflector is mounted on the connecting plate 12 via a connecting leg 19 and is located in front of the feed, i.e., along the electromagnetic wave radiation direction.

[0053] By controlling the electric lifting assembly of the sub-reflector, the sub-reflector can be precisely moved between a high working position and a low transportation position, thus perfectly solving the transportation height limit problem of vehicle-mounted antennas while ensuring optimal performance during operation.

[0054] To make the inventive concept of this invention more easily understood, a specific embodiment is selected to illustrate its complete working process.

[0055] Referring to Figures 1 to 3, the electric lifting assembly of the secondary reflector in this embodiment has a robust circular base plate 1. A circular hole is formed in the center of the base plate 1. A drive motor 2 is vertically mounted within an annular region at the edge of the base plate 1. The output shaft of the drive motor 2 is connected to a first commutator 3, which has a vertical input shaft and two horizontal, collinear output shafts. One of the horizontal output shafts is connected to a first vertical right-angle commutator 5, converting the power vertically upward to drive a vertically mounted ball screw, i.e., a first linear actuator 9. The other horizontal output shaft is connected to a first horizontal right-angle commutator 6, maintaining a horizontal orientation and transmitting power to the other side of the assembly, inputting it to a second commutator 4. The second commutator 4 has a horizontal input shaft, a vertically upward output shaft, and a horizontally outward output shaft. Its vertical output shaft directly drives a second ball screw, i.e., a second linear actuator 10. Its horizontal output shaft is sequentially connected to the second horizontal right-angle commutator 7 and the second vertical right-angle commutator 8, ultimately driving the third ball screw, i.e., the third linear actuator 11. The three ball screws are arranged in an equilateral triangle, and their nuts are connected to a circular connecting plate 12 via universal joints or rigid connecting rods. Three sets of linear bearings 15 are mounted on the connecting plate 12, respectively fitted onto three guide rods 14 vertically fixed to the base plate 1. The connecting plate 12 has a central circular hole. The tops of the three ball screws are fixed together by a circular first reinforcing plate 17. The lower end of one optical shaft is fixed to the first reinforcing plate 17, while the lower ends of the other two optical shafts are fixed to the base plate 1.

[0056] Working Process: When the sub-reflector needs to be raised, the controller starts the drive motor 2 to rotate forward. The torque of the drive motor 2 is transmitted synchronously and equally to the three ball screws through the transmission chain. The three ball screws rotate synchronously, driving the three nuts to move upward in a straight line synchronously and at the same speed. The nuts drive the connecting plate 12 to move upward, and the linear bearing 15 on the connecting plate 12 slides smoothly along the optical axis, ensuring a straight movement trajectory. The connecting plate 12 drives the sub-reflector to rise smoothly as a whole through the connecting leg 19 until the encoder 16 feedbacks that the preset working height has been reached, at which point the drive motor 2 stops. Throughout the entire rising process, the center of the sub-reflector is strictly aligned without tilting. Conversely, the drive motor 2 can be reversed to make the sub-reflector descend synchronously and smoothly to the transport height. Since the central area is unobstructed, the feed source is always placed in the center of the circular hole. When it is necessary to replace the feed source or repair the sub-reflector, only a few connecting parts between the connecting plate 12 and the nuts need to be removed, and the entire sub-reflector module and the connecting leg 19 can be lifted and removed. The lifting module is completely retained on the base plate 1, making maintenance extremely convenient.

[0057] In the above-described optimal embodiment, the first linear actuator 9, the second linear actuator 10, and the third linear actuator 11 are all based on ball screws.

[0058] It should be noted that linear actuators also encompass other mechanisms that can convert rotary motion into linear motion. For example, as another feasible embodiment, a linear actuator can be implemented using a hydraulic cylinder or pneumatic cylinder in conjunction with a rotary hydraulic or pneumatic motor. In this case, each output shaft of the transmission chain will drive the hydraulic or pneumatic motor to rotate, and the motor will then drive the cylinder to extend or retract. Although the driving medium is different, its function of "receiving rotational power and outputting linear motion" is equivalent to that of a lead screw and nut mechanism, and it can also achieve the synchronous lifting purpose of this invention.

[0059] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0060] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0061] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A secondary reflector electric lifting assembly, characterized in that, include: Base plate (1); drive motor (2), fixed on the base plate (1); fixed on the base plate (1), for synchronously distributing the rotational power of a single input shaft to two output shafts, a first commutator (3) and a second commutator (4), the two output shafts of the first commutator (3) are collinearly arranged, and the two output shafts of the second commutator (4) are perpendicular to each other; a first vertical right-angle commutator (5), a first horizontal right-angle commutator (6), a second horizontal right-angle commutator (7) and a second vertical right-angle commutator (8); a first linear actuator (9) and a second linear actuator. (10) and the third linear actuator (11); wherein, the first linear actuator (9) is vertically fixed on the first vertical right-angle commutator (5), the second linear actuator (10) is vertically fixed on the second commutator transfer case (4), and the third linear actuator (11) is vertically fixed on the second vertical right-angle commutator (8); the first linear actuator (9), the second linear actuator (10) and the third linear actuator (11) are circumferentially distributed around a central axis perpendicular to the base plate (1); a connecting plate (12) is used to install the sub-reflector ( 13); wherein, the output shaft of the drive motor (2) is connected to the input shaft of the first commutator (3); one output shaft of the first commutator (3) is connected to the input shaft of the first vertical right-angle commutator (5), and the output shaft of the first vertical right-angle commutator (5) is connected to and drives the first linear actuator (9); the other output shaft of the first commutator (3) is connected to the input shaft of the first horizontal right-angle commutator (6), and the output shaft of the first horizontal right-angle commutator (6) is connected to the input shaft of the second commutator (4); one output shaft of the second commutator (4) is connected to the input shaft of the first vertical right-angle commutator (5); One output shaft is connected to and drives the second linear actuator (10); the other output shaft of the second commutator (4) is connected to the input shaft of the second horizontal right-angle commutator (7), the output shaft of the second horizontal right-angle commutator (7) is connected to the input shaft of the second vertical right-angle commutator (8), and the output shaft of the second vertical right-angle commutator (8) is connected to and drives the third linear actuator (11); the linear output ends of the first linear actuator (9), the second linear actuator (10) and the third linear actuator (11) are all fixedly connected to the connecting plate (12).

2. The electric lifting assembly for the secondary reflector surface according to claim 1, characterized in that, The input shaft of the first reversing transfer case (3) is set perpendicular to the base plate (1); and the output shaft of the second reversing transfer case (4) used to drive the second linear actuator (10) is set perpendicular to the base plate (1).

3. The electric lifting assembly for the secondary reflector surface according to claim 1, characterized in that, The sub-reflector electric lifting assembly also includes a first reinforcing plate (17), which fixes the first linear actuator (9), the second linear actuator (10) and the third linear actuator (11) away from the base plate (1), and the linear output ends of the first linear actuator (9), the second linear actuator (10) and the third linear actuator (11) pass through the first reinforcing plate (17).

4. The electric lifting assembly for the secondary reflector surface according to claim 3, characterized in that, The electric lifting assembly of the sub-reflector also includes a guide mechanism, which includes at least three guide rods (14) and linear bearings (15) mounted on the connecting plate (12) and corresponding to the guide rods (14). The linear bearings (15) are sleeved on the corresponding guide rods (14).

5. The electric lifting assembly for the secondary reflector surface according to claim 4, characterized in that, Each of the guide rods (14) is fixed at one end near the base plate (1) to the base plate (1) or the first reinforcing plate (17).

6. The electric lifting assembly for the secondary reflector surface according to claim 5, characterized in that, The guiding mechanism also includes a second reinforcing plate (18); one of the guide rods (14) is connected to the first reinforcing plate (17) at one end near the base plate (1), and the other two guide rods (14) are connected to the base plate (1) at one end near the base plate (1).

7. The electric lifting assembly for the secondary reflector surface according to claim 1, characterized in that, The sub-reflector electric lifting assembly also includes an encoder (16), which is mounted on the output shaft of the drive motor (2) or on any of the transmission shafts in the mechanical transmission chain.

8. The electric lifting assembly for the secondary reflector surface according to claim 1, characterized in that, The base plate (1) and the connecting plate (12) are respectively provided with mounting through holes for the feed source to pass through. The drive motor (2), the first commutator (3), the second commutator (4), the first vertical right-angle commutator (5), the first horizontal right-angle commutator (6), the second horizontal right-angle commutator (7), the second vertical right-angle commutator (8), the first linear actuator (9), the second linear actuator (10) and the third linear actuator (11) are all arranged in the annular space defined by the mounting through hole and the base plate (1).

9. The electric lifting assembly for the secondary reflector surface according to claim 1, characterized in that, The sub-reflector (13) is connected to the connecting plate (12) through multiple connecting legs (19). The sub-reflector (13) and the multiple connecting legs (19) together constitute a sub-reflector module that can be detached as a whole. The base plate (1), the drive motor (2), the first commutator (3), the second commutator (4), the first vertical right-angle commutator (5), the first horizontal right-angle commutator (6), the second horizontal right-angle commutator (7), the second vertical right-angle commutator (8), the first linear actuator (9), the second linear actuator (10), the third linear actuator (11), and the guide mechanism together constitute a lifting module. The sub-reflector module and the lifting module are detachably connected.

10. An antenna comprising a main reflector, a feed source, and a sub-reflector (13), characterized in that, It also includes an electric lifting assembly for the sub-reflector as described in any one of claims 1-9, wherein the feed source is mounted on the base plate (1) and passes through the mounting through hole of the connecting plate (12), and the sub-reflector (13) is mounted on the connecting plate (12) and located in front of the feed source.

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