Radar antenna polarization switching device

Abstract

The utility model discloses a radar antenna polarization switching device, which comprises a shell, a waveguide tube rotatably supported on the shell, a dielectric sheet fixedly connected in the waveguide tube, a single-phase asynchronous motor, a coupler, a worm and gear transmission assembly, a gear transmission assembly and a microswitch sensing assembly, the microswitch induction assembly comprises an induction sleeve arranged outside the waveguide tube in a sleeving mode, a first protrusion and a second protrusion are arranged on the periphery of the induction sleeve, the microswitch induction assembly further comprises a first microswitch and a second microswitch, and the first microswitch and the second microswitch are arranged on the shell. When the dielectric sheet in the waveguide tube rotates to a first corner position, the first protrusion triggers the first microswitch to send out a motor stop signal, and when the dielectric sheet in the waveguide tube rotates to a second corner position, the second microswitch is triggered to send out a motor stop signal. The device is low in cost, high in reliability and good in maintainability.

Description

Technical Field

[0001] This utility model relates to the field of radar antenna technology, and in particular to a radar antenna polarization switching device. Background Technology

[0002] Radar antenna polarization can be divided into linear polarization and circular polarization. When the radar is working, it often needs to switch the antenna polarization mode to target different target information.

[0003] Common polarization methods often fall into the following two categories:

[0004] 1. Polarization switching is achieved by rotating the entire feed. This method requires a large rotating mechanism, has a long polarization switching time, and increases the overall weight of the radar.

[0005] 2. A polarization switching device is added inside the feed, using a combination of servo motor, driver, and encoder to achieve polarization switching. Parabolic radar requires continuous 360-degree rotation, which necessitates the use of conductive slip rings. However, using a combination of servo motor, driver, and encoder to achieve polarization switching increases the signal channels of the conductive slip rings, resulting in high cost and low maintainability. Utility Model Content

[0006] The purpose of this invention is to provide a radar antenna polarization switching device to improve the maintainability of the radar antenna polarization switching device.

[0007] To address this, the present invention provides a radar antenna polarization switching device, comprising a housing, a waveguide rotatably supported on the housing, and a dielectric sheet fixedly connected to the waveguide. The dielectric sheet in the waveguide is linearly polarized when rotated to a first angle position and circularly polarized when rotated to a second angle position. The device also includes a single-phase asynchronous motor, a coupling, a worm gear transmission assembly, a gear transmission assembly, and a micro-switch sensing assembly. The micro-switch sensing assembly includes a sensing sleeve fitted outside the waveguide, with a first protrusion and a second protrusion on the outer periphery of the sensing sleeve. The micro-switch sensing assembly further includes a first micro-switch and a second micro-switch disposed on the housing. The first micro-switch is adapted to the position of the first protrusion, and the second micro-switch is adapted to the position of the second protrusion. When the dielectric sheet in the waveguide rotates to the first angle position, the first protrusion triggers the first micro-switch, sending a motor stop signal; when the dielectric sheet in the waveguide rotates to the second angle position, the second micro-switch is triggered, sending a motor stop signal.

[0008] Furthermore, the output shaft of the aforementioned single-phase asynchronous motor and the worm in the worm gear transmission assembly are connected by a coupling.

[0009] Furthermore, the aforementioned worm gear transmission assembly includes a worm, a worm wheel, and a connecting rod shaft supported on the housing, wherein the pinion of the worm wheel and the gear transmission assembly is mounted on the connecting rod shaft.

[0010] Furthermore, the aforementioned gear transmission assembly includes a pinion and a large gear meshing with it, wherein the waveguide is provided with a connecting flange, and the large gear is connected to the connecting flange by a number of bolts.

[0011] Furthermore, the first protrusion and the second protrusion are staggered along the axial direction of the sensing sleeve and also staggered along the circumference of the sensing sleeve. The first micro switch and the second micro switch are arranged side by side along the axial direction of the sensing sleeve.

[0012] Compared with existing technologies, the beneficial effects of this utility model are reflected in:

[0013] 1. This utility model adopts a worm gear mechanism, which can realize the self-locking of the medium plate angle, and the motor does not need to add a brake function.

[0014] 2. This utility model adopts a micro-switch sensing mechanism, which can realize the switching of the dielectric sheet angle by two micro-switches. It has low cost, high reliability and good maintainability.

[0015] 3. This utility model can expand the polarization multi-angle switching by increasing the number of protrusions on the sensing sleeve and increasing the number of micro switches.

[0016] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0018] Figure 1 This is an isometric schematic diagram of the expandable polarization switching device of this utility model;

[0019] Figure 2 This is a front cross-sectional view of the expandable polarization switching device of this utility model;

[0020] Figure 3 This is a side cross-sectional view of the expandable polarization switching device of this utility model;

[0021] Figure 4 This is a front view of the induction sleeve in the expandable polarization switching device of this utility model;

[0022] Figure 5 yes Figure 4 Side view.

[0023] In the figure: 1. Housing; 2. Single-phase asynchronous motor; 3. Coupling; 4. Worm gear; 5. Worm wheel; 6. Connecting rod shaft; 7. Pinion; 8. Gear; 9. Micro switch; 10. Micro switch; 11. Induction sleeve; 12. Waveguide; 13. Dielectric sheet; 11a. First boss; 11b. Second boss. Detailed Implementation

[0024] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] Combined with reference Figures 1 to 5 The radar antenna polarization switching device of this utility model includes: a housing 1, a power drive assembly, a worm gear transmission assembly, a gear transmission assembly, and a micro switch sensing assembly.

[0026] The power drive assembly mainly consists of a single-phase asynchronous motor 2 and a coupling 3, which provides power to the device.

[0027] The worm gear transmission assembly mainly consists of a worm 2, a worm wheel 5, and a connecting rod shaft 6, which enables the device to achieve self-locking when in position.

[0028] The gear transmission assembly mainly consists of a small gear 7 and a large gear 8, which realize the rotation of the medium plate 13.

[0029] The micro switch sensing component mainly consists of a first micro switch 9, a first micro switch 10, a sensing sleeve 11, a waveguide 12, and a dielectric sheet 13, which realizes the switching of angles, thereby realizing the switching between linear polarization and circular polarization.

[0030] A single-phase asynchronous motor 2 is mounted on the housing 1. The single-phase asynchronous motor 2 is coaxially connected to the worm 4 through the coupling 3. After the worm 4 meshes with the worm wheel 5, it transmits torque and changes the transmission direction. The worm wheel 5 is coaxially connected to the pinion 7 through the connecting rod shaft 6. After the pinion 7 meshes with the large gear 8, it transmits torque. The large gear 8 is mounted on the waveguide 12 through countersunk screws. The induction sleeve is mounted on the waveguide 12 through set screws. The dielectric sheet 13 is glued inside the waveguide 12. The first micro switch 9 and the second micro switch 10 are mounted on the housing 1.

[0031] When one of the protrusions 11a of the sensing sleeve 11 triggers the micro switch 9, the micro switch 9 transmits a stop signal to the single-phase asynchronous motor 2, and the single-phase asynchronous motor 2 stops rotating. When the other protrusion of the sensing sleeve 11 triggers the micro switch 10, the micro switch 10 transmits a stop signal to the single-phase asynchronous motor 2, and the single-phase asynchronous motor 2 stops rotating. At this time, the angle switching of the dielectric sheet 13 can be completed, thereby realizing the switching between linear polarization and circular polarization.

[0032] The above description is merely an embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A radar antenna polarization switching device comprising a housing, a waveguide rotatably supported by the housing, and a dielectric sheet secured in the waveguide, wherein, The waveguide features linear polarization when the dielectric sheet rotates to the first angular position and circular polarization when rotated to the second angular position. It is characterized by further comprising: a single-phase asynchronous motor, a coupling, a worm gear transmission assembly, a gear transmission assembly, and a micro-switch sensing assembly. The micro-switch sensing assembly includes a sensing sleeve fitted over the waveguide, and the outer periphery of the sensing sleeve is provided with a first protrusion and a second protrusion. The micro-switch sensing component further includes a first micro-switch and a second micro-switch disposed on the housing, wherein the first micro-switch is adapted to a first protrusion position and the second micro-switch is adapted to a second protrusion position. When the dielectric sheet in the waveguide rotates to a first corner position, the first protrusion triggers the first micro-switch and sends a motor stop signal, and when the dielectric sheet in the waveguide rotates to a second corner position, the second micro-switch is triggered and sends a motor stop signal.

2. The radar antenna polarization switching device of claim 1, wherein, The output shaft of the single-phase asynchronous motor and the worm in the worm gear transmission assembly are connected by a coupling.

3. The radar antenna polarization switching device of claim 1, wherein, The worm gear transmission assembly includes a worm, a worm wheel, and a connecting rod shaft supported on the housing, wherein the pinion of the worm wheel and the gear transmission assembly is mounted on the connecting rod shaft.

4. The radar antenna polarization switching device of claim 1, wherein, The gear transmission assembly includes a pinion and a meshing gear, wherein the waveguide is provided with a connecting flange, and the gear is connected to the connecting flange by a number of bolts.

5. The radar antenna polarization switching device of claim 1, wherein, The first protrusion and the second protrusion are staggered along the axial direction of the sensing sleeve and also staggered along the circumference of the sensing sleeve. The first micro switch and the second micro switch are arranged side by side along the axial direction of the sensing sleeve.

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