Shift adjustment device and base station antenna

Abstract

The present invention provides a shift adjustment device and a base station antenna. The shift adjustment device includes: a mounting seat, within which a mounting cavity is provided; a gear position output unit, including a gear position transmission part and a plurality of gear position output parts, with one gear position output part corresponding to one antenna gear position; a gear position transmission unit, including a driving lead screw disposed in the mounting cavity along the first direction and a transmission nut threadedly connected to the driving lead screw; and a driving unit, including a first driving part and a second driving part disposed on the mounting seat, the first driving part being drivingly connected to the driving lead screw, and the second driving part being drivingly connected to the transmission nut for driving the transmission nut to rotate. The shift adjustment device and the antenna provided by the present invention aim to solve the problems of the existing antenna transmission device being relatively complex in transmission, occupying a relatively large area, and having a relatively high cost.

Description

Technical Field

[0001] The present invention relates to the technical field of base stations, and particularly to a gear shifting adjustment device and a base station antenna. Background Art

[0002] A base station, namely a public mobile communication base station, is an interface device for mobile devices to access the Internet, and is also a form of radio station. It refers to a radio transceiver station that transmits and receives information with mobile phone terminals through a mobile communication switching center in a certain radio coverage area. Both the base station and the terminal transmit and receive signals through the medium of an antenna.

[0003] With the continuous increase in the number of mobile terminals, the demand for mobile communication base station antennas is also increasing. However, due to the resource limitations of mobile base stations, it has increasingly become a demand trend to integrate multiple antennas together. For multi-band antennas, the current electric adjustment method is to use a separate downtilt adjustment device for each frequency band of the antenna, that is, a multi-band antenna requires multiple downtilt adjustment devices, which are controlled and adjusted by multiple motors. This causes problems such as complex transmission of the antenna drive adjustment mechanism, large floor area, and high usage cost. Summary of the Invention

[0004] The present invention provides a gear shifting adjustment device and a base station antenna, aiming to solve the problems of complex transmission, large occupied area, and high cost of the existing antenna drive device.

[0005] In view of the problems existing in the prior art, the present invention provides a gear shifting adjustment device, including:

[0006] A mounting seat, provided with a mounting cavity inside;

[0007] A gear position output unit, including a gear position transmission part and a plurality of gear position output parts. The gear position transmission part includes a mounting shaft disposed in the mounting cavity along a first direction and a plurality of gear position transmission gears movably disposed on the mounting shaft. Each gear position output part is correspondingly arranged with each gear position transmission gear, and one gear position output part is used for corresponding to one antenna gear position;

[0008] A gear position transmission unit, including a driving lead screw disposed in the mounting cavity along the first direction and a transmission nut threadedly connected to the driving lead screw; and,

[0009] A driving unit, including a first driving part and a second driving part disposed on the mounting seat. The first driving part is drivingly connected to the driving lead screw and is used to drive the driving lead screw to rotate so that the transmission nut can be meshed and connected with any one of the transmission gears. The second driving part is drivingly connected to the transmission nut and is used to drive the transmission nut to rotate so that any one of the transmission gears drivingly connected by the transmission nut rotates.

[0010] A shift adjustment device provided according to the present invention, the transmission nut includes a mounting sleeve and a switching gear, the mounting sleeve is threadedly connected to the driving lead screw, the switching gear is rotatably sleeved on the periphery of the mounting sleeve, and the second driving part is used to drive the switching gear to rotate.

[0011] A shift adjustment device provided according to the present invention, the first driving part includes a transmission gear set, a driving transmission part and a first driver, the transmission gear set is arranged at the end of the driving lead screw, the driving transmission part is meshed and connected with the transmission gear set, and the first driver is drivingly connected to the driving transmission part.

[0012] A shift adjustment device provided according to the present invention, the driving transmission part includes a transmission conversion shaft and a first transmission spur gear and a transmission bevel gear arranged at both ends of the transmission conversion shaft, the transmission conversion shaft extends along the first direction, the first transmission spur gear is meshed and connected with the transmission gear set, and the transmission bevel gear is meshed and connected with the first driver.

[0013] A shift adjustment device provided according to the present invention, the second driving part includes a transmission tooth shaft and a second driver, the transmission tooth shaft is arranged in the installation cavity along the first direction and is meshed and connected with the switching gear, and the second driver is drivingly connected to the transmission tooth shaft so that the transmission tooth shaft has an active stroke of rotating along its axial direction.

[0014] A shift adjustment device provided according to the present invention, the transmission tooth shaft includes a first section and a second section arranged at intervals, the second driver is arranged between the first section and the second section and is respectively meshed and connected with the first section and the second section.

[0015] A shift adjustment device provided according to the present invention, the transmission gear set includes a second transmission spur gear arranged at the end of the driving lead screw and a third transmission spur gear arranged at the end of the second section, and the second transmission spur gear is meshed and connected with the third transmission spur gear.

[0016] A shift adjustment device provided according to the present invention, a first limit block is arranged on the second transmission spur gear, a second limit block is correspondingly arranged on the mounting sleeve, and the first limit block and the second limit block cooperate with each other to limit the mounting sleeve when it moves to a preset position.

[0017] A shift adjustment device provided according to the present invention, the first driver includes a first driving shaft and a first driving bevel gear and a first driving knob arranged at both ends of the first driving shaft, the first driving shaft extends along the second direction, and the first driving bevel gear is meshed and connected with the transmission bevel gear.

[0018] A shift adjustment device provided by the present invention, the second driver includes a second drive shaft, and second drive bevel gears and second drive knobs provided at both ends of the second drive shaft. The second drive shaft extends along a second direction. The second drive bevel gears are provided between the first section and the second section and are drivingly connected to the first section and the second section.

[0019] A shift adjustment device provided by the present invention, a limit seat is further provided in the installation cavity. A limit groove is opened in the limit seat, and the installation shaft is clamped in the limit groove.

[0020] The present invention also provides a base station antenna, including the shift adjustment device described in any one of the above.

[0021] The shift adjustment device provided by the present invention has a compact structure. Through the coordinated work of the gear position output unit, the gear position transmission unit, and the drive unit, multiple antenna frequency bands can be controlled. Moreover, the shift adjustment device provided by the present invention occupies a small space, which is conducive to the miniaturization and thinning of the multi-band integrated antenna, and is more conducive to reducing costs and improving the working efficiency of the shift adjustment device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 A three-dimensional structure schematic diagram of an embodiment of the shift adjustment device provided by the present invention;

[0024] Figure 2 For Figure 1 Three-dimensional structure disassembly schematic diagram;

[0025] Figure 3 For Figure 1 Partial three-dimensional structure schematic diagram;

[0026] Figure 4 Is Figure 1 Partial structure schematic diagram in the first state;

[0027] Figure 5 Is Figure 1 Partial structure schematic diagram in the second state;

[0028] Figure 6 Is Figure 1 Partial structure schematic diagram of the gear position transmission unit and the drive unit in

[0029] Reference numerals: 1: shift adjustment device; 2: mounting seat; 3: gear position output unit; 4: drive unit; 5: gear position transmission unit; 6: limit seat; 7: limit groove; 8: gear position transmission part; 9: gear position output part; 10: first drive part; 11: second drive part; 12: mounting shaft; 13: gear position transmission gear; 14: drive lead screw; 15: transmission nut; 16: transmission gear set; 17: drive transmission part; 18: first driver; 19: transmission gear shaft; 20: second driver; 21: mounting sleeve; 22: switching gear; 23: second straight transmission gear; 24: third straight transmission gear; 25: transmission conversion shaft; 26: first straight transmission gear; 27: transmission bevel gear; 28: first drive shaft; 29: first drive bevel gear; 30: first drive knob; 31: second drive shaft; 32: second drive bevel gear; 33: second drive knob; 34: second limit block; 35: first limit block; 36: mounting cavity. Detailed implementation manners

[0030] In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0031] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationships indicated by the terms "center", "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the embodiments of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0032] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific situations.

[0033] In the embodiments of the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is less than that of the second feature.

[0034] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0035] The following combines Figures 1-6 to describe the shift adjustment device 1 and the base station antenna provided by the present invention.

[0036] To solve the problems in the traditional technology that the transmission of the antenna transmission device is relatively complex, occupies a large position, and has a high cost. The present invention provides a shift adjustment device 1 and a base station antenna. Since the main inventive point of the present invention lies in the shift adjustment device 1, the relevant structures of the base station antenna will not be elaborated herein.

[0037] The present invention provides a shift adjustment device 1, comprising: a mounting base 2, within which there is a mounting cavity 36; a gear position output unit 3, including a gear position transmission portion 8 and a plurality of gear position output portions 9, the gear position transmission portion 8 including a mounting shaft 12 disposed within the mounting cavity 36 along a first direction and a plurality of gear position transmission gears 13 movably disposed on the mounting shaft 12, each gear position output portion 9 being correspondingly arranged with each gear position transmission gear 13, and one gear position output portion 9 being used for corresponding to one antenna gear position; it should be noted that the mounting shaft 12 is fixedly disposed within the mounting cavity 36, each gear position transmission gear 13 is movably disposed on the mounting shaft 12 and has a moving stroke of rotating along the axial direction of the mounting shaft 12, when the gear position transmission gear 13 rotates, it can drive the corresponding antenna gear position to output; a gear position transmission unit 5, including a driving lead screw 14 disposed within the mounting cavity 36 along the first direction and a transmission nut 15 threadedly connected to the driving lead screw 14; and a driving unit 4, including a first driving portion 10 and a second driving portion 11 disposed on the mounting base 2, the first driving portion 10 is drivingly connected to the driving lead screw 14 and is used for driving the driving lead screw 14 to rotate, during the rotation of the driving lead screw 14, the transmission nut 15 will move along the axial direction of the driving lead screw 14 and select a gear position transmission gear 13 to engage and connect during the movement, since each gear position transmission gear 13 corresponds to one antenna gear position, thus the first driving portion 10 can complete the selection of the antenna gear position; the second driving portion 11 is drivingly connected to the transmission nut 15 and is used for driving the transmission nut 15 to rotate so that the transmission nut 15 drives the engaged and connected gear position transmission gear 13 to rotate, thus the second driving portion 11 can complete the output of the antenna gear position.

[0038] The shift adjustment device 1 provided by the present invention can complete the output of multiple antenna gear positions through the cooperation of the gear position output unit 3, the gear position transmission unit 5 and the driving unit 4. Moreover, the shift adjustment device 1 provided by the present invention occupies a small space, is beneficial to the miniaturization and thinning of the multi - frequency integrated antenna, and is more conducive to reducing costs and improving the working efficiency of the shift adjustment device 1.

[0039] Specifically, the transmission nut 15 has a movable stroke for axial movement along the drive lead screw 14 to select any one gear position transmission gear 13 for meshing connection; the transmission nut 15 also has a movable stroke for axial rotation along the drive lead screw 14 to drive the engaged gear position transmission gear 13 to rotate. Therefore, the transmission nut 15 includes a mounting sleeve 21 and a switching gear 22. The mounting sleeve 21 is threadedly connected to the drive lead screw 14. During the rotation of the drive lead screw 14, the mounting sleeve 21 will move along the drive lead screw 14. The switching gear 22 is rotatably sleeved on the circumference of the mounting sleeve 21. The second driving part 11 can drive the switching gear 22 to rotate so that the switching gear 22 drives the corresponding gear position transmission gear 13 to rotate. It should be noted that an installation groove can be opened on the mounting sleeve 21, and a part of the switching gear 22 is immersed in the installation groove, which plays a limiting role on the switching gear 22, preventing the switching gear 22 from disengaging while not affecting the rotation of the switching gear 22.

[0040] Further, the first driving part 10 includes a transmission gear set 16, a driving transmission part 17, and a first driver 18. The transmission gear set 16 is arranged at the end of the drive lead screw 14. The driving transmission part 17 is meshed with the transmission gear set 16. The first driver 18 is drivingly connected to the driving transmission part 17. The transmission gear set 16 can be provided with multiple transmission gears or at least two transmission gears. The present invention does not limit this.

[0041] Specifically, the driving transmission part 17 includes a transmission conversion shaft 25, a first transmission spur gear 26 and a transmission bevel gear 27 arranged at both ends of the transmission conversion shaft 25. The transmission conversion shaft 25 extends along the first direction. The first transmission spur gear 26 is meshed with the transmission gear set 16. The transmission bevel gear 27 is meshed with the first driver 18. Referring to the attached drawings, in the technical solution provided by the present invention, the first driver 18 includes a first drive shaft 28, a first drive bevel gear 29 and a first drive knob 30 arranged at both ends of the first drive shaft 28. The first drive shaft 28 extends along the second direction. The first drive bevel gear 29 is meshed with the transmission bevel gear 27. By arranging the transmission bevel gear 27 and the first drive bevel gear 29, the transmission direction can be converted, which is beneficial to improving the utilization efficiency of space and making the device more integrated. It should be noted that in this embodiment, the first direction extends along the length direction of the mounting seat 2, and the second direction extends along the width direction of the mounting seat 2.

[0042] Further, the second driving part 11 includes a transmission gear shaft 19 and a second driver 20. The transmission gear shaft 19 is arranged in the installation cavity 36 along the first direction. The transmission gear shaft 19 is provided with tooth threads, and the transmission gear shaft 19 is meshed and connected with the switching gear 22 through the tooth threads. Moreover, the switching gear 22 can be meshed and connected with the transmission gear shaft 19 at any position during the moving process. The second driver 20 is drivingly connected to the transmission gear shaft 19 to enable the transmission gear shaft 19 to have a moving stroke of rotating along its axial direction.

[0043] It should be noted that there are various driving modes of the second driver 20, which can be directly drivingly connected to the transmission gear shaft 19 to drive the transmission gear shaft 19 to rotate. In the technical solution provided by the present invention, the transmission gear shaft 19 includes a first section and a second section arranged at intervals. The second driver 20 is arranged between the first section and the second section and is respectively meshed and connected with the first section and the second section. With such an arrangement, a bevel gear can be placed between the first section and the second section to complete the change of the driving direction, which is beneficial to improving the utilization rate of space. Specifically, the second driver 20 includes a second driving shaft 31, a second driving bevel gear 32 and a second driving knob 33 arranged at both ends of the second driving shaft 31. The second driving shaft 31 extends along the second direction. The second driving bevel gear 32 is arranged between the first section and the second section and is drivingly connected to the first section and the second section. It should be noted that there is a section of interval between the first section and the second section. The surface of the transmission gear shaft 19 in this interval is smooth, and correspondingly, no gear shift transmission gear 13 is arranged in the extending direction of this interval. This interval is exactly located in the middle of the two gear shift transmission gears 13.

[0044] Further, in the technical solution provided by the present invention, the transmission gear set 16 includes a second transmission spur gear 23 arranged at the end of the driving lead screw 14 and a third transmission spur gear 24 arranged at the end of the second section. The second transmission spur gear 23 is meshed and connected with the third transmission spur gear 24. A first limiting block 35 is arranged on the second transmission spur gear 23, and a second limiting block 34 is correspondingly arranged on the mounting sleeve 21. When the first limiting block 35 contacts the second limiting block 34, it is regarded as the zero position state, that is, the initial state of the device. In this state, the switching gear 22 is meshed and connected with the first gear shift transmission gear 13, which represents the output of the first antenna gear.

[0045] As described above, the mounting shaft 12 is fixedly mounted in the mounting cavity 36. Specifically, a limiting seat 6 is further provided in the mounting cavity 36, and a limiting groove 7 is formed in the limiting seat 6. The mounting shaft 12 is clamped in the limiting groove 7, so that the mounting shaft 12 will not rotate, and the gear 13 for gear position transmission thereon can rotate along the axial direction of the mounting shaft 12. It should also be noted that in the technical solution provided by the present invention, the gear position output part 9 includes an output shaft and a bevel gear, and the bevel gear is meshed and connected with the corresponding gear 13 for gear position transmission, and the output shaft extends out of the mounting cavity 36 and is connected with the antenna phase shifter.

[0046] The working process of the device will be briefly described below: First, drive the first drive knob 30 to rotate forward or backward, which can sequentially drive the first drive bevel gear 29, the transmission bevel gear 27, the first transmission spur gear 26, the third transmission spur gear 24, and the second transmission spur gear 23 to rotate in the corresponding rotation directions, so as to drive the transmission nut 15 to move along the drive screw rod 14, so that the first limiting block 35 contacts the second limiting block 34, that is, the device reaches the zero position starting position at this time. Then, similarly control the first drive knob 30 to rotate a set number of turns, so as to drive the switching gear 22 to move linearly along the axial direction of the drive screw rod 14, so that the switching gear 22 meshes with the first group of gears 13 for gear position transmission and then stops;

[0047] Then drive the second drive knob 33 to rotate forward or backward, which can sequentially drive the second drive bevel gear 32 and the transmission gear shaft 19 to rotate in the corresponding rotation directions. The transmission gear shaft 19 is meshed with the switching gear 22, and the switching gear 22 drives the corresponding gear 13 for gear position transmission to rotate, thereby driving the corresponding gear position output part 9 to rotate. The gear position output part 9 is connected with a phase shifter for adjusting the antenna downtilt angle, so as to realize the adjustment of the first group of antenna phase shifters;

[0048] After the adjustment of the first group of antenna phase shifters is completed, the zero position starting position is similarly determined according to the contact between the first limiting block 35 and the second limiting block 34, and then the adjustment of the next group of antenna phase shifters is carried out. By analogy, the first driver 18 can realize the selective meshing of the switching gear 22 with all the gears 13 for gear position transmission, and the second driver 20 can realize the corresponding antenna gear position output of the gear position output part 9. Through the first driver 18 and the second driver 20, the adjustment of all phase shifters can be realized, so as to achieve the purpose of adjusting multiple antenna phase shifters by using two power sources. In the embodiment of the present invention, the screw rods, gears, etc. used in the gear position output unit 3, the gear position transmission unit 5, and the drive unit 4 can have their axes arranged on the same flat layer, so that the thickness of the entire shift device can be made very thin, which has great advantages in height compared with the "cylindrical" layout or the shift parts with high-space stacking and staggering in the same field.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A shift adjustment device, characterized in that, it includes: a mounting base, in which a mounting cavity is provided; a gear position output unit, including a gear position transmission part and a plurality of gear position output parts, the gear position transmission part includes a mounting shaft arranged in the mounting cavity along a first direction and a plurality of gear position transmission gears movably arranged on the mounting shaft, each of the gear position output parts is correspondingly arranged with each of the gear position transmission gears, and one of the gear position output parts is used for corresponding to one antenna gear position; a gear position transmission unit, including a driving lead screw arranged in the mounting cavity along the first direction and a transmission nut threadedly connected to the driving lead screw; and, a driving unit, including a first driving part and a second driving part arranged on the mounting base, the first driving part is drivingly connected to the driving lead screw and is used for driving the driving lead screw to rotate so that the transmission nut can be meshed and connected with any one of the transmission gears, and the second driving part is drivingly connected to the transmission nut and is used for driving the transmission nut to rotate so that any one of the gear position transmission gears drivingly connected by the transmission nut rotates; the first driving part includes a transmission gear set, a driving transmission part and a first driver, the transmission gear set is arranged at the end of the driving lead screw, the driving transmission part is meshed and connected with the transmission gear set, and the first driver is drivingly connected to the driving transmission part; the transmission nut includes a switching gear, the second driving part includes a transmission tooth shaft and a second driver, the transmission tooth shaft is arranged in the mounting cavity along the first direction and is meshed and connected with the switching gear, and the second driver is drivingly connected to the transmission tooth shaft so that the transmission tooth shaft has a movable stroke of rotating along its axial direction; the first direction extends along the length direction of the mounting base.

2. The shift adjustment device according to claim 1, characterized in that, the transmission nut further includes a mounting sleeve, the mounting sleeve is threadedly connected to the driving lead screw, the switching gear is rotatably sleeved on the periphery of the mounting sleeve, and the second driving part is used for driving the switching gear to rotate.

3. The shift adjustment device according to claim 1, characterized in that, the driving transmission part includes a transmission conversion shaft, a first transmission spur gear and a transmission bevel gear, the first transmission spur gear is arranged at one end of the transmission conversion shaft, the transmission bevel gear is arranged at the other end of the transmission conversion shaft, the transmission conversion shaft extends along the first direction, the first transmission spur gear is meshed and connected with the transmission gear set, and the transmission bevel gear is meshed and connected with the first driver.

4. The shift adjustment device according to claim 2, characterized in that, the transmission tooth shaft includes a first section and a second section arranged at intervals, and the second driver is arranged between the first section and the second section and is respectively meshed and connected with the first section and the second section.

5. The shift adjustment device according to claim 4, characterized in that, The transmission gear set includes a second transmission spur gear provided at the end of the drive lead screw and a third transmission spur gear provided at the end of the second section, and the second transmission spur gear is meshed and connected with the third transmission spur gear.

6. The shift adjustment device according to claim 5, characterized in that a first limit block is provided on the second transmission spur gear, a second limit block is correspondingly provided on the mounting sleeve, and the first limit block and the second limit block cooperate with each other to limit the mounting sleeve when it moves to a preset position.

7. The shift adjustment device according to claim 3, characterized in that the first driver includes a first drive shaft, a first drive bevel gear and a first drive knob, the first drive bevel gear is provided at one end of the first drive shaft, the first drive knob is provided at the other end of the first drive shaft, the first drive shaft extends along a second direction, and the first drive bevel gear is meshed and connected with the transmission bevel gear; the second direction extends along the width direction of the mounting base.

8. The shift adjustment device according to claim 4, characterized in that the second driver includes a second drive shaft, a second drive bevel gear and a second drive knob, the second drive bevel gear is provided at one end of the second drive shaft, the second drive knob is provided at the other end of the second drive shaft, the second drive shaft extends along the second direction, and the second drive bevel gear is provided between the first section and the second section and is drivingly connected to the first section and the second section.

9. The shift adjustment device according to claim 1, characterized in that a limit seat is further provided in the installation cavity, a limit groove is formed in the limit seat, and the installation shaft is clamped in the limit groove.

10. A base station antenna, characterized in that it includes the shift adjustment device according to any one of claims 1-9.

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