A rotary feed-changing mechanism

Abstract

The present invention is a rotary feed switching mechanism, which relates to the field of antenna feed switching technology. It includes a right support, a left support, a bearing, a rotating wheel, a code disc bracket, a code disc cover, a round nut, a transmission shaft, a shift fork, a limit switch, a coupling, a limit shaft, a code disc, an upper outer cover, a lower outer cover, a drive unit, an angle piece, a support cover plate, a collision block, a polytetrafluoroethylene film, a pressure ring, and a feed source bracket. The present invention can achieve the purpose of switching feed sources efficiently and quickly, and multiple feed sources can be installed on one antenna at the same time, which is particularly suitable for antennas that require multi-band feed source switching.

Description

Technical Field

[0001] The present invention relates to the field of antenna feed switching technology, and in particular to a mechanical structure in a reflector antenna for realizing feed source switching of different frequency bands, and is suitable for reflector antennas requiring feed source networks of multiple frequency bands. Background Art

[0002] With the rapid development of global aerospace measurement and control technology, the antennas of measurement and control ground stations are developing towards multi-band and high-precision. In order to adapt to the antenna system's multi-band satellite signal transmission and reception shared signals, reflector antennas usually use multiple groups of feed sources to achieve frequency band switching.

[0003] At present, most radar systems have only a single or multiple fixed feed sources. The multi-feed radar system with automatic feed switching has the characteristics of high radar system resource utilization and strong detection capability, so it has great advantages in certain specific situations. The multi-feed fully automatic feed switching system is a key equipment of this radar system. It can automatically switch the feed to be worked to the focal position as needed. The focusing accuracy and repeated focusing accuracy after feed switching determine the performance of the entire radar system. Wang Yuzhe of China Electronics 54 Institute described a rotary feed switching mechanism in his paper "Design of Multi-Feed Switching Mechanism for Large Radio Telescopes". However, the rotary feed switching has a large shielding area, complex structure, and complex wiring. Since the entire system is used outdoors, the environmental adaptability of the guide components of the feed switching system is required to be high. In addition, the commonly used high-precision ball linear guides have poor corrosion resistance, high cost, and long cycle. Summary of the invention

[0004] In view of this, the present invention provides a rotary feed-changing mechanism. The feed-changing mechanism is suitable for medium and large-caliber fixed-station reflector antennas that share high-precision, multi-band feed sources, and has the advantages of being fully automatic, high-precision, stable and reliable, capable of being equipped with a multi-band feed source network, strong feasibility, and simple in principle.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A rotary feed-changing mechanism comprises a right support 1, a left support 2, a bearing 3, a rotating wheel 4, a code disc bracket 5, a code disc cover 6, a round nut 7, a transmission shaft 8, a shift fork 9, a limit switch 10, a coupling 11, a limit shaft 12, a code disc 13, an upper outer cover 14, a lower outer cover 15, a driving unit 16, an angle piece 17, a support cover plate 18, a collision block 19, a polytetrafluoroethylene film 20, a pressure ring 21, and a feed source bracket 22;

[0007] The right support 1 comprises a first cylinder 1-1, and the cylinder has first rectangular support plates 1-2 on both sides symmetrically of the cylinder surface. The first cylinder 1-1 and the first rectangular support plate 1-2 are connected and reinforced by a first rib plate 1-3 to form a whole. Two bearings 3 are installed in the first cylinder 1-1 of the right support 1. The left end surface of the first cylinder 1-1 is connected to the upper outer cover 14 and the lower outer cover 15. The first rectangular support plate 1-2 is connected to the support frame of the main reflector of the antenna body.

[0008] The left support 2 includes a second cylinder 2-1, a second rectangular support plate 2-2, a motor mounting plate 2-3, a frame plate 2-4, and a second rib plate 2-5. Two bearings 3 are installed in the second cylinder 2-1. The right end surface of the second cylinder 2-1 is connected to the upper outer cover 14 and the lower outer cover 15. The left end surface of the second cylinder 2-1 is connected to the code disc bracket 5. The motor mounting plate 2-3 is connected to the drive unit 16 and the limit shaft 12. The frame plate 2-4 is connected to the support cover plate 18.

[0009] There are four bearings 3, which are arranged symmetrically in two groups, with two bearings in each group; the outer ring of the bearing 3 is connected to the left support 2 and the right support 1, and the inner ring of the bearing 3 is connected to the rotating wheel 4;

[0010] The rotating wheel 4 is a rotating wheel structure composed of rods, which is composed of a frame 4-1, a large gear 4-2, a fixed plate 4-3, a left shaft 4-4 and a right shaft 4-5. The left shaft 4-4 and the right shaft 4-5 are respectively connected to the inner ring of the bearing 3, and the fixed plate 4-3 is connected to the feed bracket 22;

[0011] The code disc support 5 is located on the left side of the rotating wheel 4. One side of the code disc support 5 has a flange, the inner end surface of the flange is connected to the left support 2, and the other side of the code disc support 5 is connected to the code disc 13;

[0012] The flange end surface of the code disc cover 6 is connected to the outer end surface of the flange of the code disc bracket 5;

[0013] There are four round nuts 7, which are divided into two groups and symmetrically arranged on both sides of the rotating wheel 4. The two groups of round nuts are respectively connected to the left shaft 4-4 and the right shaft 4-5 of the rotating wheel 4;

[0014] One end face of the flange of the transmission shaft 8 is connected to the left shaft 4-4 of the rotating wheel 4, and the other end face is connected to the coupling 11;

[0015] The shift fork 9 is connected to the transmission shaft 8;

[0016] The limit switch 10 is connected to the code disc bracket 5;

[0017] One end of the coupling 11 is connected to the transmission shaft 8, and the other end is connected to the code disc 13;

[0018] The limit shaft 12 is connected to the motor mounting plate 2-3 in the left support 2;

[0019] The code disc 13 is connected to the transmission shaft 8;

[0020] The upper outer cover 14 is connected to the lower outer cover 15 to form a complete cylindrical outer cover, the left side of the cylindrical outer cover is connected to the left support 2, and the right side is connected to the right support 1;

[0021] The driving unit 16 is composed of a motor 16-1, a reducer 16-2, and a gear 16-3. The driving unit 16 is fixedly connected to the motor mounting plate 2-3 of the left support 2, and the gear 16-3 of the driving unit 16 is connected to the large gear 4-2 of the rotating wheel 4;

[0022] The angle piece 17 is connected to the rotating wheel 4 and is used to install the power adapter box and the radio frequency switch;

[0023] The support cover plate 18 is connected to the left support 2 and is used to protect the drive unit 16;

[0024] The collision block 19 is connected to the rotating wheel 4;

[0025] The polytetrafluoroethylene membrane 20 is connected to the lower outer cover 15, covers the upper opening, and is pressed by the pressure ring 21;

[0026] The pressure ring 21 presses the polytetrafluoroethylene film 20;

[0027] The feed bracket 22 is connected to the rotating wheel 4 and is used for fixedly supporting and installing feed networks of various frequency bands.

[0028] Furthermore, the driving unit 16 is installed on the left support 2, and after passing through the left support 2 and the upper outer cover 14, the driving unit 16 engages with the rotating wheel 4, thereby driving the rotating wheel 4 to rotate to achieve feed switching.

[0029] Furthermore, the polytetrafluoroethylene film 20 is pressed tightly at the circular hole of the lower outer cover 15 by a pressing ring 21 , and the working frequency band feed source network faces the polytetrafluoroethylene film 20 .

[0030] Furthermore, the rotating wheel 4 is connected to the left support 2 and the right support 1 through the bearing 3 to achieve relative rotation; the rotating wheel 4 is equipped with a feed bracket 22, an angle piece 17 and a collision block 19, and mechanical limiting is achieved through hard contact between the collision block 19 and the limiting shaft 12 installed on the left support 2 during rotation.

[0031] Furthermore, the transmission shaft 8 is connected to the rotating wheel 4 and the coupling 11 respectively, so as to transmit the angle information to the code disc 13. At the same time, the shift fork 9 on the transmission shaft 8 and the limit switch 10 on the code disc bracket 5 constitute an electric limit.

[0032] The beneficial effects of the present invention are:

[0033] 1. The present invention has ingenious conception, clear ideas and is easy to implement.

[0034] 2. The present invention achieves the purpose of feed switching through rotation, which is efficient and simple.

[0035] 3. The feed source bracket of the present invention can be flexibly replaced, so that the purpose of replacing the network feed source at any time can be achieved.

[0036] 4. The rotary wheel structure of the present invention utilizes space more efficiently, thereby increasing the number of feed sources that can be installed; and the rotary wheel structure has an outer cover for protection, so the protective sealing effect is also better. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a cross-sectional view of a feed-exchange mechanism in an embodiment of the present invention;

[0038] Figure 2 is a three-dimensional diagram of the feed-exchange mechanism in an embodiment of the present invention from the left side perspective;

[0039] Figure 3 is a three-dimensional diagram of the feed-exchange mechanism in the embodiment of the present invention from the right side perspective;

[0040] Figure 4 It is a left side view of the feed-exchange mechanism in the embodiment of the present invention;

[0041] Figure 5 is a bottom view of the feed-exchange mechanism in an embodiment of the present invention;

[0042] Figure 6 It is a front view of the feed-switch mechanism in the embodiment of the present invention after removing the upper outer cover 14, the lower outer cover 15, the code disc cover 6, the left support 2, and the right support 1;

[0043] Figure 7 is a front view of the rotating wheel 4 of the feed-exchange mechanism in an embodiment of the present invention;

[0044] Figure 8 is a three-dimensional diagram of the rotating wheel 4 of the feed-exchange mechanism in an embodiment of the present invention;

[0045] Fig. 9 It is a schematic diagram of the limiting shaft 12 and the collision block 19.

[0046] The meanings of the numbers in the figure are as follows: right support 1, cylinder 1-1, rectangular support plate 1-2, rib plate 1-3, left support 2, cylinder 2-1, rectangular support plate 2-2, motor mounting plate 2-3, frame plate 2-4, rib plate 2-5, bearing 3, rotating wheel 4, frame 4-1, large gear 4-2, fixed plate 4-3, left shaft 4-4 and right shaft 4-5 code disc bracket 5, code disc cover 6, round nut 7, transmission shaft 8, shift fork 9, limit switch 10, coupling 11, limit shaft 12, code disc 13, upper outer cover 14, lower outer cover 15, drive unit 16, motor 16-1, reducer 16-2, gear 16-3, angle piece 17, support cover 18, bumper 19, polytetrafluoroethylene film 20, pressure ring 21, feed source bracket 22. DETAILED DESCRIPTION

[0047] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0048] A rotary feed-changing mechanism includes a right support, a left support, a bearing, a rotating wheel, a code disc bracket, a code disc cover, a round nut, a transmission shaft, a shift fork, a limit switch, a coupling, a limit shaft, a code disc, an upper outer cover, a lower outer cover, a drive unit, an angle piece, a support cover, a bumper, a polytetrafluoroethylene film, a pressure ring, and a feed source bracket. The right support has a cylindrical profile, and the cylindrical surface of the cylinder is symmetrical with a rectangular support plate on both sides. The cylinder and the rectangular support plate are connected and reinforced by a rib plate to form a whole. Two bearings are installed in the cylinder of the right support. The left end face of the cylinder is connected to the upper outer cover and the lower outer cover, and the rectangular support plate is connected to the support frame of the main reflector of the antenna body.

[0049] The left support is composed of a cylinder, a rectangular support plate, a motor mounting plate, a frame plate and a rib plate. Two bearings are installed in the cylinder. The right end face of the cylinder is connected to the upper outer cover and the lower outer cover. The left end face of the cylinder is connected to the code disc bracket. The motor mounting plate is connected to the drive unit and the limit shaft, and the frame plate is connected to the support cover plate.

[0050] The bearings are composed of four parts, which are divided into two groups and arranged symmetrically, with two parts in each group. The outer ring of the bearing is connected with the right support and the left support, and the inner ring of the bearing is connected with the rotating wheel.

[0051] The rotating wheel is a rotating wheel structure composed of rods, which consists of a frame, a large gear, a fixed plate, a left shaft and a right shaft. The left shaft and the right shaft are respectively connected to the inner ring of the bearing, and the fixed plate is connected to the feed bracket.

[0052] The code disc support is located on the left side of the rotating wheel, the flange end face of the code disc support is connected to the left support (2), and the other side is connected to the code disc.

[0053] The end surface of the code disc cover flange is connected to the code disc bracket.

[0054] There are four round nuts in total, which are divided into two groups and symmetrically arranged on both sides of the rotating wheel, and are respectively connected to the left shaft and the right shaft of the rotating wheel.

[0055] The flange of the transmission shaft is connected to the left shaft of the rotating wheel, and the other end surface is connected to the coupling.

[0056] The shift fork is connected with the transmission shaft.

[0057] The limit switch is connected to the code disc bracket.

[0058] One end of the coupling is connected to the transmission shaft, and the other end is connected to the code disc.

[0059] The limiting shaft is connected to the motor mounting plate in the left support.

[0060] The code disc is connected with the transmission shaft.

[0061] The upper outer cover is connected with the lower outer cover to form a complete cylindrical outer cover, the left side of which is connected with the left support, and the right side is connected with the right support.

[0062] The upper outer cover is connected with the lower outer cover to form a complete cylindrical outer cover, the left side of which is connected with the left support, and the right side is connected with the right support.

[0063] The driving unit is composed of a motor, a reducer, and a gear. The driving unit is connected and fixed to the motor mounting plate of the left support (2), and the gear of the driving unit is connected to the large gear of the rotating wheel.

[0064] The angle piece is connected to the rotating wheel and is used to install electrical components such as a power adapter box and a radio frequency switch.

[0065] The support cover is connected to the left support and is used to protect the drive unit.

[0066] The collision block is connected with the rotating wheel.

[0067] The polytetrafluoroethylene film is connected to the lower outer cover, covers the upper opening, and is pressed tightly by a pressure ring.

[0068] The pressure ring presses the polytetrafluoroethylene film.

[0069] The feed bracket is connected to the rotating wheel and is used for fixedly supporting and installing feed networks of various frequency bands.

[0070] The driving unit is installed on the left support. After passing through the left support and the upper cover, the driving unit engages with the rotating wheel and can drive the rotating wheel to rotate to achieve the purpose of feed switching.

[0071] The polytetrafluoroethylene film is pressed tightly by a pressure ring at the circular hole of the lower outer cover, and the working frequency band feed source network is directly facing this place.

[0072] The rotating wheel is connected to the left support and the right support through bearings so that they can rotate relatively. The rotating wheel is equipped with a feed bracket, an angle piece and a limit block. During rotation, the hard contact between the limit block and the limit shaft installed on the left support can achieve mechanical limiting.

[0073] The transmission shaft is connected with the rotating wheel and the coupling respectively, and the angle information can be transmitted to the code disc. Meanwhile, the shift fork on the transmission shaft and the limit switch on the code disc bracket can realize electric limit.

[0074] like Figure 1 As shown, a rotary feed-changing mechanism includes a right support 1, a left support 2, a bearing 3, a rotating wheel 4, a code disc bracket 5, a code disc cover 6, a round nut 7, a transmission shaft 8, a shift fork 9, a limit switch 10, a coupling 11, a limit shaft 12, a code disc 13, an upper outer cover 14, a lower outer cover 15, a drive unit 16, an angle piece 17, a support cover plate 18, a collision block 19, a polytetrafluoroethylene film 20, a pressure ring 21, and a feed source bracket 22.

[0075] like Figure 1 , Figure 3 and Figure 5 As shown, the outer contour of the right support 1 is a cylinder, and the cylindrical surface of the cylinder is symmetrically provided with rectangular support plates 1-2 on both sides. The cylinder 1-1 and the rectangular support plates 1-2 are connected and reinforced by rib plates 1-3 to form a whole. Two bearings 3 are installed in the cylinder 1-1 of the right support 1. The left end face of the cylinder 1-1 is connected to the upper outer cover 14 and the lower outer cover 15, and the rectangular support plate 1-2 is connected to the support frame of the main reflector of the antenna body.

[0076] like Figure 1 , Figure 2 and Figure 4 As shown, the left support 2 is composed of a cylinder 2-1, a rectangular support plate 2-2, a motor mounting plate 2-3, a frame plate 2-4, and a rib plate 2-5. Two bearings 3 are installed in the cylinder 2-1. The right end face of the cylinder 2-1 is connected to the upper outer cover 14 and the lower outer cover 15. The left end face of the cylinder 2-1 is connected to the code disc bracket 5. The motor mounting plate 2-3 is connected to the drive unit 16 and the limit shaft 12. The frame plate 2-4 is connected to the support cover plate 18.

[0077] like Figure 1 and Figure 6 As shown, the bearing 3 is composed of four, which are divided into two groups and arranged symmetrically, with two in each group. The outer ring of the bearing 3 is connected to the left support 2 and the right support 1, and the inner ring of the bearing 3 is connected to the rotating wheel 4.

[0078] like Figure 1 , Figure 6 , Figure 7 and Figure 8As shown, the rotating wheel 4 is a rotating wheel structure composed of rods, which consists of a frame 4-1, a large gear 4-2, a fixed plate 4-3, a left shaft 4-4 and a right shaft 4-5. The left shaft 4-4 and the right shaft 4-5 are respectively connected to the inner ring of the bearing 3, and the fixed plate 4-3 is connected to the feed bracket 22.

[0079] like Figure 1 and Figure 6 As shown, the code disc support 5 is located on the left side of the rotating wheel 4 , the flange end face of the code disc support 5 is connected to the left support 2 , and the other side is connected to the code disc 13 .

[0080] like Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, the flange end face of the code disc cover 6 is connected to the code disc bracket 5 .

[0081] like Figure 1 and Figure 6 As shown, there are four round nuts 7, which are divided into two groups and symmetrically arranged on both sides of the rotating wheel 4, and are respectively connected to the left shaft 4-4 and the right shaft 4-5 of the rotating wheel 4;

[0082] like Figure 1 As shown, the transmission shaft 8 is connected to the left shaft 4 - 4 of the rotating wheel 4 at the flange, and the other end face is connected to the coupling 11 .

[0083] like Figure 1 As shown, the shift fork 9 is connected to the transmission shaft 8 .

[0084] like Figure 1 and Figure 6 As shown, the limit switch 10 is connected to the code disc bracket 5 .

[0085] like Figure 1 and Figure 6 As shown, one end of the coupling 11 is connected to the transmission shaft 8 , and the other end is connected to the code disk 13 .

[0086] like Figure 1 and Fig. 9 As shown, the limit shaft 12 is connected to the motor mounting plate 2-3 in the left support 2;

[0087] like Figure 1 and Figure 6 As shown, the code disc 13 is connected to the transmission shaft 8;

[0088] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the upper outer cover 14 is connected to the lower outer cover 15 to form a complete cylindrical outer cover, the left side of which is connected to the left support 2, and the right side is connected to the right support 1;

[0089] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the upper outer cover 14 is connected to the lower outer cover 15 to form a complete cylindrical outer cover, the left side of which is connected to the left support 2, and the right side is connected to the right support 1;

[0090] like Figure 1 and Figure 6 As shown, the drive unit 16 is composed of a motor 16-1, a reducer 16-2, and a gear 16-3. The drive unit 16 is fixedly connected to the motor mounting plate 2-3 of the left support 2, and the gear 16-3 of the drive unit 16 is connected to the large gear 4-2 of the rotating wheel 4;

[0091] like Figure 1 As shown, the angle piece 17 is connected to the rotating wheel 4 and is used to install electrical components such as a power adapter box and a radio frequency switch;

[0092] like Figure 1 , Figure 2 and Figure 4 As shown, the support cover 18 is connected to the left support 2 and is used to protect the drive unit 16;

[0093] like Figure 1 and Fig. 9 As shown, the collision block 19 is connected to the rotating wheel 4;

[0094] like Figure 1 and Figure 5 As shown, the polytetrafluoroethylene membrane 20 is connected to the lower outer cover 15, covers the upper opening, and is pressed by the pressure ring 21;

[0095] like Figure 1 and Figure 5 As shown, the pressure ring 21 presses the polytetrafluoroethylene membrane 20;

[0096] like Figure 1 and Figure 6 As shown, the feed bracket 22 is connected to the rotating wheel 4 and is used to fix, support and install feed networks of various frequency bands.

[0097] like Figure 1 and Figure 6 As shown, the driving unit 16 is installed on the left support 2. After passing through the left support 2 and the upper outer cover 14, the driving unit 16 engages with the rotating wheel 4, and can drive the rotating wheel 4 to rotate to achieve the purpose of feed switching.

[0098] like Figure 5 As shown, the polytetrafluoroethylene film 20 is pressed tightly by a pressing ring 21 at the circular hole of the outer cover 15, and the working frequency band feed source network is facing this place.

[0099] like Figure 1 and Figure 6As shown, the rotating wheel 4 is connected to the left support 2 and the right support 1 through the bearing 3 so that they can rotate relative to each other. The rotating wheel 4 is equipped with a feed bracket 22, an angle piece 17 and a collision block 19. During rotation, the hard contact between the collision block 19 and the limit shaft 12 installed on the left support 2 can achieve mechanical limiting.

[0100] like Figure 1 and Figure 6 As shown, the transmission shaft 8 is connected to the rotating wheel 4 and the coupling 11 respectively, and the angle information can be transmitted to the code disc 13. At the same time, the electric limit can be achieved between the shift fork 9 on the transmission shaft 8 and the limit switch 10 on the code disc bracket 5.

[0101] In summary, the present invention can achieve the purpose of switching feed sources efficiently and quickly, and multiple feed sources can be installed on one antenna at the same time, which is particularly suitable for antennas that require multi-band feed source switching.

Claims

1. A rotary feed-changing mechanism, characterized in that: It includes a right support (1), a left support (2), a bearing (3), a rotating wheel (4), a code disc bracket (5), a code disc cover (6), a round nut (7), a transmission shaft (8), a shift fork (9), a limit switch (10), a coupling (11), a limit shaft (12), a code disc (13), an upper outer cover (14), a lower outer cover (15), a drive unit (16), an angle piece (17), a support cover plate (18), a collision block (19), a polytetrafluoroethylene film (20), a pressure ring (21), and a feed source bracket (22); The right support (1) comprises a first cylinder (1-1), with first rectangular support plates (1-2) symmetrically disposed on both sides of the cylinder surface, the first cylinder (1-1) and the first rectangular support plate (1-2) being connected and reinforced by a first rib plate (1-3) to form a whole, two bearings (3) being installed in the first cylinder (1-1) of the right support (1), the left end surface of the first cylinder (1-1) being connected to an upper outer cover (14) and a lower outer cover (15), and the first rectangular support plate (1-2) being connected to a support frame of a main reflector of the antenna body; The left support (2) comprises a second cylinder (2-1), a second rectangular support plate (2-2), a motor mounting plate (2-3), a frame plate (2-4), and a second rib plate (2-5); two bearings (3) are installed in the second cylinder (2-1); the right end surface of the second cylinder (2-1) is connected to an upper outer cover (14) and a lower outer cover (15); the left end surface of the second cylinder (2-1) is connected to a code disc bracket (5); the motor mounting plate (2-3) is connected to a drive unit (16) and a limit shaft (12); and the frame plate (2-4) is connected to a support cover plate (18); There are four bearings (3) divided into two groups and arranged symmetrically, with two bearings in each group; the outer ring of the bearing (3) is connected to the right support (1) and the left support (2), and the inner ring of the bearing (3) is connected to the rotating wheel (4); The rotating wheel (4) is a rotating wheel structure composed of rods, and is composed of a frame (4-1), a large gear (4-2), a fixing plate (4-3), a left shaft (4-4) and a right shaft (4-5). The left shaft (4-4) and the right shaft (4-5) are respectively connected to the inner ring of the bearing (3), and the fixing plate (4-3) is connected to the feed bracket (22); The code disc support (5) is located on the left side of the rotating wheel (4), one side of the code disc support (5) has a flange, the inner end surface of the flange is connected to the left support (2), and the other side of the code disc support (5) is connected to the code disc (13); The flange end surface of the code disc cover (6) is connected to the outer end surface of the flange of the code disc bracket (5); There are four round nuts (7) in total, which are divided into two groups and symmetrically arranged on both sides of the rotating wheel (4). The two groups of round nuts are respectively connected to the left shaft (4-4) and the right shaft (4-5) of the rotating wheel (4); One end face of the flange of the transmission shaft (8) is connected to the left shaft (4-4) of the rotating wheel (4), and the other end face is connected to the coupling (11); The shift fork (9) is connected to the transmission shaft (8); The limit switch (10) is connected to the code disc bracket (5); One end of the coupling (11) is connected to the transmission shaft (8), and the other end is connected to the code disc (13); The limiting shaft (12) is connected to the motor mounting plate (2-3) in the left support (2); The code disc (13) is connected to the transmission shaft (8); The upper outer cover (14) is connected to the lower outer cover (15) to form a complete cylindrical outer cover, the left side of the cylindrical outer cover is connected to the left support (2), and the right side is connected to the right support (1); The driving unit (16) is composed of a motor (16-1), a reducer (16-2), and a gear (16-3); the driving unit (16) is connected and fixed to the motor mounting plate (2-3) of the left support (2); and the gear (16-3) of the driving unit (16) is connected to the large gear (4-2) of the rotating wheel (4); The angle piece (17) is connected to the rotating wheel (4) and is used to install a power adapter box and a radio frequency switch; The support cover plate (18) is connected to the left support (2) and is used to protect the drive unit (16); The collision block (19) is connected to the rotating wheel (4); The polytetrafluoroethylene membrane (20) is connected to the lower outer cover (15), covers the upper opening, and is compressed by a pressure ring (21); The pressure ring (21) presses the polytetrafluoroethylene film (20); The feed bracket (22) is connected to the rotating wheel (4) and is used for fixedly supporting and installing feed networks of various frequency bands.

2. A rotary feed-changing mechanism according to claim 1, characterized in that: The driving unit (16) is mounted on the left support (2), and after passing through the left support (2) and the upper outer cover (14), the driving unit (16) engages with the rotating wheel (4), thereby driving the rotating wheel (4) to rotate to achieve feed switching.

3. A rotary feed-changing mechanism according to claim 1, characterized in that: The polytetrafluoroethylene film (20) is pressed tightly at the circular hole of the lower outer cover (15) by a pressing ring (21), and the working frequency band feed source network faces the polytetrafluoroethylene film (20).

4. A rotary feed-changing mechanism according to claim 1, characterized in that: The rotating wheel (4) is connected to the left support (2) and the right support (1) via a bearing (3) to achieve relative rotation; a feed bracket (22), an angle piece (17) and a bumper (19) are mounted on the rotating wheel (4); during rotation, mechanical limiting is achieved through hard contact between the bumper (19) and a limiting shaft (12) mounted on the left support (2).

5. The rotary feed-changing mechanism according to claim 1, characterized in that: The transmission shaft (8) is connected to the rotating wheel (4) and the coupling (11) respectively, so as to transmit the angle information to the code disc (13). At the same time, the shift fork (9) on the transmission shaft (8) and the limit switch (10) on the code disc bracket (5) form an electric limit.

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