Double-reflector antenna with auxiliary reflector capable of being overturned, unfolded and folded

Abstract

The utility model discloses a double-reflecting-surface antenna with an auxiliary reflecting surface capable of being overturned, unfolded and folded. The double-reflecting-surface antenna comprises a main reflecting surface, the auxiliary reflecting surface, a feed source, a fixed frame, a storage position locking structure and a working position locking structure. Due to the fact that the movable fixing frame is hinged to the fixed fixing frame, by rotating the movable fixing frame, the movable fixing frame can be located at the storage position of the side portion of the fixed fixing frame and can also be located at the working position of the top of the fixed fixing frame. When the double-reflector antenna is transported, the movable fixing frame can be rotated to the side part of the fixed fixing frame and is locked through the storage position locking structure, the overall height of the antenna is reduced while relative rotation does not occur, and thus transportation is facilitated. When the double-reflector antenna needs to be unfolded to a working state, only the movable fixing frame needs to be rotated to the top of the fixed fixing frame and is locked through the working position locking structure. Therefore, the double-reflector antenna is simple in structure, and the problem of overrun of a vehicle-mounted antenna in the highway and railway transportation process can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of radar antenna, in particular to a double-reflector antenna with a reversible and retractable sub-reflector. BACKGROUND

[0002] In satellite tracking and communication applications, in order to obtain better microwave performance, a double-reflector antenna system is currently used. The double-reflector antenna can conveniently control the aperture field distribution, can shorten the focal length of the reflector, can ensure the required antenna pattern, and can increase the flexibility of the design. The double-reflector antenna mainly includes a main reflector, a back frame, a feed, a center body, a sub-reflector, and a support rod of the sub-reflector. The feed is located on the central axis of the main reflector and is fixed to the upper side of the center body. The back frame is mainly used as a support for the main reflector and is tightly connected with the center body. The main reflector and the sub-reflector are curved structures, which can focus signals in a certain direction according to certain requirements in microwave communication to enhance the transmission or reception function. The double-reflector antenna is mainly in the form of a Cassegrain antenna (Cassegrain antenna). In order to obtain the focusing characteristic, the main reflector is in the form of a rotating paraboloid, the sub-reflector is in the form of a rotating hyperboloid, and the feed can be in various forms, but the sub-reflector is usually placed in the far field of the feed.

[0003] In the implementation of the present application, the inventors have found that the prior art at least has the following problems: The sub-reflector of the existing double-reflector antenna is usually fixed by four support rods that are mutually at 90° in the circumferential direction. The double-reflector antenna is mainly represented by the Cassegrain antenna, the sub-reflector of which is usually far away from the main reflector, the positional relationship is always fixed, and occupies a large amount of space in the vertical direction, so that the overall structure is large in the working and storage states, which causes a certain degree of space waste and is not conducive to loading and transportation. CONTENT OF THE UTILITY MODEL

[0004] The double-reflector antenna with a reversible and retractable sub-reflector provided by the embodiments of the present application can solve the technical problems of the prior art that the sub-reflector occupies a large amount of space in the vertical direction and is not convenient for loading and transportation, and the technical solution is as follows:

[0005] The application discloses a double-reflector antenna with a reversible sub-reflector, which comprises a main reflector, a sub-reflector, a feed source, a fixed holder, a movable holder, a storage position locking structure and a working position locking structure; the inner concave surface of the main reflector is a working surface, and the working surface of the main reflector is a rotary parabolic surface; the outer convex surface of the sub-reflector is a working surface, and the working surface of the sub-reflector is a rotary hyperboloid; the fixed holder is fixedly connected to the working surface of the main reflector; the bottom of the movable holder is hingedly connected to the top of the fixed holder, and the sub-reflector is fixedly connected to the movable holder; the movable holder has a storage position and a working position, when the movable holder is in the storage position, the movable holder is located at the side of the fixed holder; when the movable holder is in the working position, the virtual focal point of the rotary hyperboloid corresponding to the working surface of the sub-reflector coincides with the focal point of the rotary parabolic surface.

[0006] The feed source is located at the focal point of the rotary parabolic surface constituting the main reflector, and is fixedly connected to the main reflector; the storage position locking structure is used for locking the fixed holder and the movable holder in the storage position; and the working position locking structure is used for locking the fixed holder and the movable holder in the working position.

[0007] Optionally, the top side of the fixed holder is provided with at least two hinged supports, and the side of the movable holder is provided with at least two hinged ends corresponding to the hinged supports; each hinged support is rotationally connected to the corresponding hinged end through a hinged shaft.

[0008] Optionally, each hinged end is fixedly connected to a counterweight, and the counterweight satisfies that when the movable holder is in the working position, the moment of the counterweight is equal in size and opposite in direction to the moment of the movable holder with the sub-reflector mounted thereon; or when the movable holder is in the storage position, the moment of the counterweight is equal in size and opposite in direction to the moment of the movable holder with the sub-reflector mounted thereon.

[0009] Optionally, the storage position locking structure comprises an electric locker and a lock hole holder, the electric locker is fixedly connected to the fixed holder, the electric locker is provided with a locking pin, the lock hole holder is fixedly connected to the movable holder, the lock hole holder is provided with a locking hole matched with the locking pin, and when the movable holder is in the storage position, the locking pin of the electric locker can be extended into the locking hole.

[0010] Optionally, the working position locking structure comprises a first electromagnet and a second electromagnet, and the polarities of the first electromagnet and the second electromagnet are opposite; the first electromagnet is arranged on the movable holder, the second electromagnet is arranged on the fixed holder, and when the movable holder is in the working position, the first electromagnet and the second electromagnet are attracted to each other.

[0011] Optionally, the double-reflector antenna with a flip-up and flip-down sub-reflector further comprises a flip motor, a housing of the flip motor is fixed on the fixed frame, an output shaft of the flip motor is fixedly connected with the movable frame, and the flip motor is used to drive the movable frame to rotate around the hinge shaft.

[0012] Optionally, the double-reflector antenna with a flip-up and flip-down sub-reflector further comprises a controller, a sensing block, a working position limit switch and a storage position limit switch, the sensing block is arranged on the movable frame, and the working position limit switch and the storage position limit switch are arranged on the fixed frame; when the movable frame is in the working position, the working position limit switch can be triggered by the sensing block, the controller controls the flip motor to lose power, and controls the first electromagnet and the second electromagnet to gain power; when the movable frame is in the storage position, the storage position limit switch can be triggered, the controller controls the electric lock to gain power, and the locking pin is extended.

[0013] The technical scheme provided by the embodiment of the application has at least the following beneficial effects:

[0014] The double-reflector antenna with a flip-up and flip-down sub-reflector comprises a main reflector, a sub-reflector, a feed source, a fixed frame, a storage position locking structure and a working position locking structure. Since the movable frame is hinged to the fixed frame, the movable frame can be in a storage position on the side of the fixed frame or in a working position on the top of the fixed frame by rotating the movable frame. When the double-reflector antenna is transported, the movable frame can be rotated to the side of the fixed frame and locked by the storage position locking structure, so that the overall height of the antenna is reduced and the antenna does not rotate relatively, thereby facilitating transportation. When the double-reflector antenna needs to be unfolded to a working state, the movable frame only needs to be rotated to the top of the fixed frame and locked by the working position locking structure. Therefore, the double-reflector antenna with a flip-up and flip-down sub-reflector has a simple structure and can solve the problem of over-limiting of the vehicle-mounted antenna during highway and railway transportation.

[0015] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0017] Figure 1is a structural schematic view of a dual-reflector antenna with a reversible sub-reflector in a storage position according to an embodiment of the present application;

[0018] Figure 2 is Figure 1 is a partial enlarged view of A in FIG. 1;

[0019] Figure 3 is a structural schematic view of a dual-reflector antenna with a reversible sub-reflector in a working position according to an embodiment of the present application;

[0020] Figure 4 is Figure 3 is a partial enlarged view of B in FIG. 2.

[0021] Legend of reference signs

[0022] 1 - main reflector; 2 - sub-reflector; 3 - feed; 4 - fixed bracket; 5 - movable bracket; 6 - hinged support; 7 - hinged end; 8 - counterweight; 9 - electric locker; 10 - locker hole; 11 - first electromagnet; 12 - second electromagnet; 13 - inductive block; 14 - working position limit switch; 15 - storage position limit switch; 16 - locker hole bracket. DETAILED DESCRIPTION

[0023] The specific embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present disclosure, and are not intended to limit the present disclosure.

[0024] In the present disclosure, the orientation words such as "up", "down" used herein generally refer to the "up", "down" of the corresponding components in the direction of gravity in the use state, and "inner", "outer" refer to the "inner", "outer" relative to the outline of the corresponding components. In addition, the terms "first", "second" and the like used in the present disclosure are used to distinguish one element from another element, and do not have sequential and important meanings. In the following description, the same reference signs in different drawings represent the same or similar elements unless otherwise explained.

[0025] According to the embodiments of the present application, referring to Figures 1 to 4 is shown, a dual-reflector antenna with a reversible sub-reflector is provided, which includes a main reflector 1, a sub-reflector 2, a feed 3, a fixed bracket 4, a storage position locking structure and a working position locking structure.

[0026] Wherein, the concave surface of the main reflective surface 1 is the working surface, and the working surface of the main reflective surface 1 is a paraboloid of revolution; the convex surface of the secondary reflective surface 2 is the working surface, and the working surface of the secondary reflective surface 2 is a hyperboloid of revolution; the fixed frame 4 is fixedly connected to the working surface of the main reflective surface 1; the bottom of the movable frame 5 is hinged to the top of the fixed frame 4, and the secondary reflective surface 2 is fixedly connected to the movable frame 5; the movable frame 5 has a storage position and a working position. When the movable frame 5 is in the storage position, the movable frame 5 is located on the side of the fixed frame 4; when the movable frame 5 is in the working position, the virtual focus of the hyperboloid of revolution corresponding to the working surface of the secondary reflective surface 2 coincides with the focus of the paraboloid of revolution.

[0027] The feed source 3 is located at the focal point of the parabolic surface of rotation constituting the main reflector 1 and is fixedly connected to the main reflector 1; the storage position locking structure is used to lock the fixed frame 4 and the movable frame 5 in the storage position; the working position locking structure is used to lock the fixed frame 4 and the movable frame 5 in the working position.

[0028] In the above embodiments, since the movable mounting bracket 5 is hinged to the fixed mounting bracket 4, by rotating the movable mounting bracket 5, it can be in a stored position on the side of the fixed mounting bracket 4 or in a working position on top of the fixed mounting bracket 4. When the dual-reflector antenna is being transported, the movable mounting bracket 5 can be rotated to the side of the fixed mounting bracket 4 and locked by the stored position locking structure. The overall height of the antenna is reduced without relative rotation, thus facilitating transportation. When the dual-reflector antenna needs to be deployed to the working state, it is only necessary to rotate the movable mounting bracket 5 to the top of the fixed mounting bracket 4 and lock it by the working position locking structure. Therefore, the dual-reflector antenna with a retractable sub-reflector of this application has a simple structure and can solve the problem of exceeding limits during the transportation of vehicle-mounted antennas by road and rail.

[0029] According to the embodiments of this application, refer to Figure 1 As shown, the fixed frame 4 has at least two hinge supports 6 on its top side, and the movable frame 5 has at least two hinge ends 7 corresponding to the hinge supports 6 on its side. Each hinge support 6 and its corresponding hinge end 7 are rotatably connected by a hinge shaft. In the above embodiment, a hinge method of two hinge supports 6 and two hinge ends 7 is specifically adopted. In other embodiments, the number of hinge supports 6 and hinge ends 7 can be other numbers, such as one hinge support 6 corresponding to one hinge, or three hinge supports 6 corresponding to three hinge ends 7. This application does not limit this.

[0030] According to the embodiments of this application, refer to Figures 1 to 4As shown, each of the hinge ends 7 is fixedly connected to a counterweight 8, which satisfies the following condition: when the movable mounting frame 5 is in the working position, the torque of the counterweight 8 is equal in magnitude and opposite in direction to the torque of the movable mounting frame 5 with the sub-reflector 2 installed. In this case, the movable mounting frame 5 with the counterweight 8 is in a balanced state in the working position. Connecting the counterweight 8 to the movable mounting frame 5 can, on the one hand, enable the dual-reflector antenna to maintain better stability in the working state, and on the other hand, reduce the load on the drive device used to drive the movable mounting frame 5 to rotate. For example, when the drive device used to drive the movable mounting frame 5 to rotate is a rotating motor, the counterweight 8 can reduce the load on the rotating motor.

[0031] Alternatively, when the movable fixing frame 5 is in the stored position, the torque of the counterweight 8 is equal in magnitude and opposite in direction to the torque of the movable fixing frame 5 with the sub-reflective surface 2 installed. In this case, the movable fixing frame 5 connected to the counterweight 8 is in a balanced state in the stored position, which can also reduce the force on the fixing frame.

[0032] In other embodiments, the counterweight 8 can compensate for the mass distribution deviation of the moving fixed frame 5 during rotation through static balance calculation and symmetrical layout design, so as to ensure that the moving fixed frame 5 connected with the counterweight 8 is subjected to uniform force during operation.

[0033] According to the embodiments of this application, refer to Figure 1 and Figure 2 As shown, the storage position locking structure includes an electric locking device 9 and a lock hole bracket 16. The electric locking device 9 is fixedly connected to the fixed bracket 4 and has a locking pin. The lock hole bracket 16 is fixedly connected to the movable bracket 5 and has a locking hole that matches the locking pin. When the movable bracket 5 is in the storage position, the locking pin of the electric locking device 9 can extend into the locking hole. In other embodiments, the storage position locking structure can also be other structures, such as a latch structure, with two electromagnets respectively provided on the movable bracket 5 and the fixed bracket 4. This application does not limit this.

[0034] According to the embodiments of this application, refer to Figures 1 to 4 As shown, the working position locking structure includes a first electromagnet 11 and a second electromagnet 12, with the polarities of the first electromagnet 11 and the second electromagnet 12 being opposite. The first electromagnet 11 is disposed on the movable fixed frame 5, and the second electromagnet 12 is disposed on the fixed fixed frame 4. When the movable fixed frame 5 is in the working position, the first electromagnet 11 and the second electromagnet 12 attract each other. In other embodiments, the working position locking structure can also be other locking methods, such as providing an electric locker 9 with a locking pin on the fixed fixed frame 4, and providing a locking hole into which the locking pin can be inserted on the movable fixed frame 5. This application does not limit this.

[0035] According to an embodiment of this application, in order to make the rotation of the movable mounting bracket 5 more labor-saving and improve the automation level of the dual reflector antenna, the dual reflector antenna with rotatable secondary reflector also includes a rotatable motor (not shown in the figure). The housing of the rotatable motor is fixed on the fixed mounting bracket 4, and the output shaft of the rotatable motor is fixedly connected to the movable mounting bracket 5. The rotatable motor is used to drive the movable mounting bracket 5 to rotate around the hinge axis.

[0036] According to the embodiments of this application, refer to Figure 1 and Figure 2 As shown, the dual-reflector antenna with a retractable sub-reflector may further include a controller, a sensing block 13, a working position limit switch 14, and a retractable position limit switch 15. The sensing block 13 is disposed on the movable fixed frame 5, and the retractable position limit switch 15 and the working position limit switch 14 are both disposed on the fixed fixed frame 4. When the movable fixed frame 5 is in the working position, the working position limit switch 14 can be triggered by the sensing block 13, and the controller controls the flip motor to de-energize, while simultaneously controlling the first electromagnet 11 and the second electromagnet 12 to be energized. When the movable fixed frame 5 is in the retractable position, the retractable position limit switch 15 can be triggered, and the controller controls the electric locking device 9 to be energized, and the locking pin extends.

[0037] The storage position limit switch 15 and the working position limit switch 14 can be mechanical micro switches or proximity switches.

[0038] The working principle of this application is explained below using a specific collection and unfolding process:

[0039] In the stored state, the stored position limit switch 15 is triggered, and then the locking pin of the electric locking device 9 extends, passes through the locking hole on the lock hole frame (16), and fixes the sub-reflective surface 2 to the fixed frame 4. At this time, the sub-reflective surface 2 is in a folded and flipped state. However, the working position limit switch 14 does not detect the sensing block 13 and is not triggered. At the same time, the first electromagnet 11 and the second electromagnet 12 are in a de-energized and disengaged state.

[0040] When the dual-reflector antenna with a retractable subreflector needs to be operated, the "one-button deployment" button can be pressed on the control panel. The controller will automatically retract the locking pin of the electric locking device 9, and then the flipping motor will drive the subreflector 2 to rise and flip at a constant speed around the center line of the hinge axis. When the working position limit switch 14 detects the sensing block 13 fixed on the moving mounting bracket 5, the limit function is triggered, the flipping motor stops working, and the first electromagnet 11 and the second electromagnet 12 are energized and attracted. At this time, the subreflector 2 is directly above the feed 3, and the dual-reflector antenna can be put into operation.

[0041] 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.

[0042] 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.

[0043] 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 dual-reflector antenna with a retractable sub-reflector, characterized in that, include: Main reflector (1), sub-reflector (2), feed source (3), fixed frame (4), moving frame (5), storage position locking structure and working position locking structure; The concave surface of the main reflecting surface (1) is the working surface, and the working surface of the main reflecting surface (1) is a parabolic surface of revolution; The convex surface of the sub-reflecting surface (2) is the working surface, and the working surface of the sub-reflecting surface (2) is a hyperboloid of revolution; The fixed frame (4) is fixedly connected to the working surface of the main reflective surface (1); The bottom of the movable fixing frame (5) is hinged to the top of the fixed fixing frame (4), and the sub-reflecting surface (2) is fixedly connected to the movable fixing frame (5); the movable fixing frame (5) has a storage position and a working position. When the movable fixing frame (5) is in the storage position, the movable fixing frame (5) is located on the side of the fixed fixing frame (4); when the movable fixing frame (5) is in the working position, the virtual focus of the hyperboloid corresponding to the working surface of the sub-reflecting surface (2) coincides with the focus of the paraboloid. The feed source (3) is located at the focal point of the parabolic surface of revolution constituting the main reflector (1) and is fixedly connected to the main reflector (1); The storage position locking structure is used to lock the fixed frame (4) and the movable frame (5) in the storage position; The working position locking structure is used to lock the fixed frame (4) and the moving frame (5) in the working position.

2. The dual-reflector antenna with a retractable secondary reflector surface according to claim 1, characterized in that, The fixed frame (4) has at least two hinge supports (6) on its top side, and the movable frame (5) has at least two hinge ends (7) corresponding to the hinge supports (6) on its side. Each hinge support (6) and the corresponding hinge end (7) are rotatably connected by a hinge shaft.

3. The dual-reflector antenna with a retractable secondary reflector surface according to claim 2, characterized in that, Each of the hinge ends (7) is fixedly connected to a counterweight (8), the counterweight (8) satisfying the following: When the movable fixing frame (5) is in the working position, the torque of the counterweight (8) is equal in magnitude and opposite in direction to the torque of the movable fixing frame (5) on which the secondary reflector (2) is installed; Alternatively, when the movable fixing frame (5) is in the stored position, the torque of the counterweight (8) is equal in magnitude and opposite in direction to the torque of the movable fixing frame (5) on which the secondary reflector (2) is installed.

4. The dual-reflector antenna with a retractable sub-reflector surface according to claim 3, characterized in that, The storage locking structure includes an electric lock (9) and a lock hole frame (16). The electric lock (9) is fixedly connected to the fixed frame (4) and has a locking pin. The lock hole frame (16) is fixedly connected to the movable frame (5) and has a locking hole that matches the locking pin. When the movable fixing bracket (5) is in the stored position, the locking pin of the electric locking device (9) can extend into the locking hole.

5. The dual-reflector antenna with a retractable sub-reflector surface according to claim 4, characterized in that, The working position locking structure includes a first electromagnet (11) and a second electromagnet (12), and the polarity of the first electromagnet (11) and the polarity of the second electromagnet (12) are opposite. The first electromagnet (11) is disposed on the movable fixed frame (5), and the second electromagnet (12) is disposed on the fixed frame (4). When the movable fixed frame (5) is in the working position, the first electromagnet (11) and the second electromagnet (12) attract each other.

6. The dual-reflector antenna with a retractable sub-reflector surface according to claim 5, characterized in that, The dual-reflector antenna with a retractable sub-reflector also includes a flip motor. The housing of the flip motor is fixed on the fixed frame (4). The output shaft of the flip motor is fixedly connected to the movable frame (5). The flip motor is used to drive the movable frame (5) to rotate around the hinge axis.

7. The dual-reflector antenna with a retractable secondary reflector surface according to claim 6, characterized in that, The dual-reflector antenna with a retractable sub-reflector also includes a controller, a sensing block (13), a working position limit switch (14), and a storage position limit switch (15). The sensing block (13) is disposed on the moving fixed frame (5), and the storage position limit switch (15) and the working position limit switch (14) are both disposed on the fixed frame (4). When the moving fixed frame (5) is in the working position, the working position limit switch (14) can be triggered by the sensing block (13), the controller controls the flip motor to lose power, and at the same time controls the first electromagnet (11) and the second electromagnet (12) to be energized; When the moving fixed bracket (5) is in the stored position, the stored position limit switch (15) can be triggered, the controller controls the electric lock (9) to be energized, and the lock pin extends.

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