C-type compensation polarization shaft structure

Abstract

The utility model relates to a C type compensation polarization shaft structure which comprises a trolley frame, a compensation frame, a compensation driving mechanism and a polarization shaft, the trolley frame and the compensation frame are both of a C type frame structure, the outer side face of the trolley frame and the outer side face of the compensation frame are both open, the compensation frame of the trolley frame is arranged in the trolley frame, and the top end of the compensation frame is connected with the top end of the trolley frame in a sliding mode. The bottom end of the compensation frame is slidably connected with the bottom end of the trolley frame, the polarization shaft is arranged on the front face of the compensation frame, the polarization axis of the polarization shaft is perpendicular to the front face of the compensation frame, and the compensation driving mechanism is arranged on the trolley frame and can drive the compensation frame to slide along the polarization axis of the polarization shaft. The beneficial effects of the utility model lie in that motion compensation can be carried out on mechanical adjustment of the polarization shaft, so that the test precision is improved, and the overall structure is stable and reliable.

Description

Technical Field

[0001] This utility model belongs to the field of RCS compact field static zone scanning frame measurement technology, specifically relating to a C-type compensated polarization axis structure. Background Technology

[0002] In recent years, stealth and anti-stealth technologies have developed rapidly, leading to increasingly higher requirements for the accuracy of radar cross section (RCS) testing. Compact field testing has been widely adopted due to its advantages such as small footprint, high accuracy, all-weather capability, and good confidentiality. The area with the lowest reflection within a darkroom is typically called the quiet zone. The size of the compact field RCS quiet zone, along with parameters such as amplitude taper, amplitude ripple, phase ripple, reflection level, cross-polarization, path loss, and operating frequency, are key indicators for evaluating the performance of the quiet zone. Therefore, testing the performance indicators of the compact field quiet zone itself is crucial.

[0003] The quiet zone scanning frame is a commonly used device for evaluating the quiet zone performance of an anechoic chamber. The polarization axis is mounted on the scanning frame, and its position in the horizontal and vertical directions can be adjusted by the mechanical adjustment mechanism on the scanning frame. At the same time, the test orientation and angle of the polarization axis can also be adjusted. However, due to structural wobbling and other reasons, the adjustment accuracy is poor, which will affect the final test accuracy of the polarization axis. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a C-type compensated polarization shaft structure, which can perform motion compensation for the mechanical adjustment of the polarization shaft, thereby improving the testing accuracy, and the overall structure is stable and reliable.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A C-type compensated polarization shaft structure includes a trolley frame, a compensation frame, a compensation drive mechanism, and a polarization shaft. Both the trolley frame and the compensation frame are C-type frame structures. The outer sides of both the trolley frame and the compensation frame are open. The compensation frame is located inside the trolley frame. The top end of the compensation frame is slidably connected to the top end of the trolley frame, and the bottom end of the compensation frame is slidably connected to the bottom end of the trolley frame. The polarization shaft is located on the front of the compensation frame, and the polarization axis of the polarization shaft is perpendicular to the front of the compensation frame. The compensation drive mechanism is located on the trolley frame and can drive the compensation frame to slide along the polarization axis of the polarization shaft.

[0007] Furthermore, the upper inner bottom surface of the trolley frame and the lower inner top surface of the trolley frame are provided with compensation guide rails along the polarization axis of the polarization axis. The upper end and the lower end of the compensation frame are provided with fixing blocks, and the fixing blocks are provided with compensation sliders that are slidably connected to the compensation guide rails.

[0008] Furthermore, the compensation drive mechanism includes a compensation motor and a ball screw. The compensation motor is located inside the upper end of the trolley frame, and the compensation motor drives the compensation frame to slide along the compensation guide rail through the ball screw.

[0009] Furthermore, limit sensors are provided at both ends of the fixing block at the upper end of the compensation frame.

[0010] Furthermore, the polarization shaft includes a polarization motor, a helical gear reducer, and a transfer shaft. The polarization motor and the helical gear reducer are located on the front of the compensation frame. The input end of the helical gear reducer is connected to the output end of the polarization motor. The axis of the transfer shaft is perpendicular to the front of the compensation frame. One end of the transfer shaft is connected to the output end of the helical gear reducer, and the other end of the transfer shaft is provided with an antenna mounting flange.

[0011] Furthermore, the output end of the helical gear reducer is equipped with an adapter flange, and the end of the adapter shaft is connected to the adapter flange by a raised face and bolts.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] The trolley frame of this utility model is used to be installed on a static zone scanning frame and can be driven by the mechanical adjustment mechanism on the static zone scanning frame to achieve horizontal, vertical, rotational, and pitching movements. In turn, it can drive the compensation frame, compensation drive mechanism, and polarization axis to move together, thereby adjusting the test orientation and angle of the polarization axis. During the adjustment process, the compensation drive mechanism can drive the compensation frame and polarization axis to move along the polarization axis of the polarization axis, thereby compensating for the motion error generated by the mechanical adjustment mechanism, improving the adjustment accuracy and the test accuracy of the polarization axis. The overall structure is stable and reliable, the compensation frame moves smoothly during the compensation process, and the compensation frame and polarization axis can remain coaxial and non-eccentric. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is an assembly diagram of the small vehicle frame and compensation frame of this utility model;

[0016] Figure 3 This is an assembly diagram of the polarization shaft and the compensation frame in this utility model.

[0017] In the diagram: 1. Carriage frame; 2. Compensation frame; 3. Compensation guide rail; 4. Fixing block; 5. Compensation slider; 6. Compensation motor; 7. Ball screw; 8. Limit sensor; 9. Polarized motor; 10. Helical gear reducer; 11. Adapter shaft; 12. Antenna mounting flange; 13. Adapter flange; 14. Raised-face stop. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description.

[0019] like Figures 1-3 As shown, a C-type compensated polarization shaft structure includes a carriage frame 1, a compensation frame 2, a compensation drive mechanism, and a polarization shaft. The compensation frame 2 and the compensation drive mechanism are mounted on the carriage frame 1, and the polarization shaft is mounted on the compensation frame 2. The polarization shaft is used for polarization testing, and the compensation drive mechanism can drive the compensation frame 2 to move along the polarization axis of the polarization shaft.

[0020] The carriage 1 is mounted on the quiet zone scanning frame, and the mechanical adjustment mechanism on the quiet zone scanning frame can drive the carriage 1 to perform horizontal, vertical, rotational, and pitching movements. In turn, the movement of the carriage 1 can adjust the test orientation and angle of the polarization axis. The motion error generated by the mechanical adjustment mechanism is compensated by the compensation drive mechanism driving the compensation frame 2 to improve the adjustment accuracy and the final test accuracy of the polarization axis.

[0021] like Figure 1 , 3 As shown, both the trolley frame 1 and the compensation frame 2 are C-shaped frame structures. During testing, the surfaces of the trolley frame 1 and the compensation frame 2 that are irradiated by radar waves are the outer surfaces of the trolley frame 1 and the compensation frame 2, respectively. The outer surface directly opposite the direction of the incoming radar wave is the front surface. In this embodiment, both the outer surfaces of the trolley frame 1 and the compensation frame 2 are open. The compensation frame 2 is located inside the trolley frame 1, with its top end slidably connected to the top end of the trolley frame 1 and its bottom end slidably connected to the bottom end of the trolley frame 1. The polarization axis is installed on the front surface of the compensation frame 2, and the polarization axis of the polarization axis is perpendicular to the front surface of the compensation frame 2. Motion compensation can be achieved by driving the compensation frame 2 to slide along the polarization axis of the polarization axis through a compensation drive mechanism.

[0022] like Figure 2 , 3 As shown, compensation guide rails 3 are fixedly installed on the inner bottom surface of the upper end and the inner top surface of the lower end of the trolley frame 1 along the polarization axis. Fixing blocks 4 are installed on the upper and lower ends of the compensation frame 2, and compensation sliders 5, which are slidably connected to the compensation guide rails 3, are fixedly installed on the fixing blocks 4. The compensation drive mechanism includes a compensation motor 6 and a ball screw 7. The compensation motor 6 is installed inside the upper end of the trolley frame 1. During motion compensation, under the sliding cooperation of the compensation slider 5 and the compensation guide rail 3, the compensation motor 6 drives the compensation frame 2 and the polarization axis to slide simultaneously along the compensation guide rail 3 via the ball screw 7. In addition, limit sensors 8 are installed at both ends of the fixing blocks 4 at the upper end of the compensation frame 2. The limit sensors 8 are laser-type limit sensors, which can limit the sliding of the compensation frame 2 and prevent it from slipping.

[0023] Since the upper and lower ends of the compensation frame 2 are slidably connected to the trolley frame 1, a limit is formed on the compensation frame 2 in the vertical direction, thereby ensuring the stability of the compensation frame 2 in the vertical direction. Furthermore, with the sliding cooperation of the compensation sliders 5 and the compensation slide rails at the upper and lower ends, the compensation frame 2 can slide smoothly, so that the compensation frame 2 and the polarization axis can remain coaxial and non-eccentric, thereby ensuring the overall compensation accuracy of the compensation motion.

[0024] like Figure 2 , 3 As shown, the polarization shaft includes a polarization motor 9, a helical gear reducer 10, and a transition shaft 11. The polarization motor 9 and the helical gear reducer 10 are mounted on the front of the compensation frame 2. The input end of the helical gear reducer 10 is connected to the output end of the polarization motor 9. A transition flange 13 is installed at the output end of the helical gear reducer 10. The axis of the transition shaft 11 is perpendicular to the front of the compensation frame 2. One end of the transition shaft 11 is connected to the transition flange 13 via a raised face 14 and then fixed to the transition flange 13 with bolts. The other end of the transition shaft 11 is equipped with an antenna mounting flange 12 for mounting the test antenna. During polarization testing, the polarization motor 9 drives the transition shaft 11 to rotate via the helical gear reducer 10, thereby rotating the test antenna. The axis of the transition shaft 11 is the polarization axis of the polarization shaft.

[0025] Finally, although embodiments of the present invention have been shown and described above, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A C-type compensated polarization axis structure, characterized in that: The device includes a trolley frame (1), a compensation frame (2), a compensation drive mechanism, and a polarization shaft. Both the trolley frame (1) and the compensation frame (2) are C-shaped frame structures. The outer side of the trolley frame (1) and the outer side of the compensation frame (2) are open. The compensation frame (2) of the trolley frame (1) is located inside the trolley frame (1). The top of the compensation frame (2) is slidably connected to the top of the trolley frame (1), and the bottom of the compensation frame (2) is slidably connected to the bottom of the trolley frame (1). The polarization shaft is located on the front of the compensation frame (2), and the polarization axis of the polarization shaft is perpendicular to the front of the compensation frame (2). The compensation drive mechanism is located on the trolley frame (1) and can drive the compensation frame (2) to slide along the polarization axis of the polarization shaft.

2. The C-type compensated polarization axis structure according to claim 1, characterized in that: Compensation guide rails (3) are provided on the inner bottom surface of the upper end of the trolley frame (1) and the inner top surface of the lower end of the trolley frame (1) along the polarization axis. Fixing blocks (4) are provided on the upper end of the compensation frame (2) and the lower end of the compensation frame (2). Compensation sliders (5) that are slidably connected to the compensation guide rails (3) are provided on the fixing blocks (4).

3. The C-type compensated polarization axis structure according to claim 2, characterized in that: The compensation drive mechanism includes a compensation motor (6) and a ball screw (7). The compensation motor (6) is located inside the upper end of the trolley frame (1). The compensation motor (6) drives the compensation frame (2) to slide along the compensation guide rail (3) through the ball screw (7).

4. The C-type compensated polarization axis structure according to claim 2, characterized in that: Limit sensors (8) are provided at both ends of the fixing block (4) at the upper end of the compensation frame (2).

5. The C-type compensated polarization axis structure according to claim 1, characterized in that: The polarization shaft includes a polarization motor (9), a helical gear reducer (10), and a transfer shaft (11). The polarization motor (9) and the helical gear reducer (10) are located on the front of the compensation frame (2). The input end of the helical gear reducer (10) is connected to the output end of the polarization motor (9). The axis of the transfer shaft (11) is perpendicular to the front of the compensation frame (2). One end of the transfer shaft (11) is connected to the output end of the helical gear reducer (10), and the other end of the transfer shaft (11) is provided with an antenna mounting flange (12).

6. The C-type compensated polarization axis structure according to claim 5, characterized in that: The output end of the helical gear reducer (10) is provided with a transition flange (13), and the end of the transition shaft (11) is connected to the transition flange (13) through a convex-concave stop (14) and bolts.

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