WO2023179334A1

WO2023179334A1 - Electric downtilt angle adjustment apparatus and base station antenna

Info

Publication number: WO2023179334A1
Application number: PCT/CN2023/079430
Authority: WO
Inventors: 黄云龙; 吴壁群; 张鹏; 谢浩昌
Original assignee: 广东博纬通信科技有限公司
Priority date: 2022-03-24
Filing date: 2023-03-03
Publication date: 2023-09-28
Also published as: CN114465005A

Abstract

The present invention relates to the technical field of antennas, and in particular, to an electric downtilt angle adjustment apparatus and a base station antenna. The electric downtilt angle adjustment apparatus comprises a position selection transmission assembly and a phase shift assembly. The position selection transmission assembly comprises a support frame, a moving switching mechanism, a transmission gear, and a second guide shaft. The second guide shaft is mounted on the support frame, and multiple transmission intermediate wheels are mounted on the second guide shaft at intervals, the transmission gear being configured to drive the transmission intermediate wheels to rotate. The moving switching mechanism is mounted on the support frame, and the moving switching mechanism is used to drive the transmission gear to move and switch among the multiple transmission intermediate wheels. A driving member is disposed on the moving switching mechanism, and the driving member is used to drive the transmission gear to rotate. The phase shift assembly comprises multiple driven members, the multiple driven members each being used to connect to a corresponding phase shifter to implement adjustment of tilt angles of the phase shifters. The electric downtilt angle adjustment apparatus provided in the present invention has the advantages of having a simple structure, being convenient to manufacture, low in cost, and light weight, having a small size, and having reliable quality.

Description

An electrical downtilt angle adjustment device and base station antenna

Technical field

The present invention relates to the field of antenna technology, and in particular to an electrical downtilt angle adjustment device and a base station antenna.

Background technique

When the base station antenna is working, it usually needs to be tilted downward at a certain angle relative to the horizontal line. The size of this tilt angle can change the radiation range of the antenna. At present, the adjustment of the antenna downtilt angle is mainly done by mechanical downtilt angle and electrical downtilt angle. The electrical downtilt angle can be controlled by remote electrical adjustment, which is low cost and is therefore increasingly widely used.

As the number of mobile communication terminal users continues to increase, the same antenna is often required to have a greater number of communication frequency bands, and the electrical downtilt angle of each communication frequency band needs to be independently controlled by driving its corresponding phase shifter transmission mechanism. Change in electrical downtilt angle. In traditional transmission devices, one drive motor is usually used to correspond to one phase shifter transmission mechanism. Due to the large number of control circuits and motors, this method is bound to cause problems such as high cost, complex structure, large space occupation, and low reliability.

Contents of the invention

The object of the present invention is to provide an antenna electrical downtilt angle adjustment device that is simple in structure, easy to manufacture, low in cost, light in weight, small in size and reliable in quality, that is, a base station antenna using the antenna electrical downtilt angle adjustment device.

In order to achieve the purpose of the present invention, the following technical solutions are adopted:

A first aspect of the present invention proposes an electric downtilt angle adjustment device. The electric downtilt angle adjustment device includes a position selection transmission assembly and a phase shifting assembly. The position selection transmission assembly includes a support frame, Mobile switching mechanism, transmission gear, and second guide shaft; a second guide shaft is installed on the support frame, and several transmission intermediary wheels are installed at intervals on the second guide shaft, and the transmission gear is used to drive the transmission intermediary wheel Rotate, the support frame is equipped with a mobile switching mechanism, the mobile switching mechanism is used to drive the transmission gear to move and switch among several transmission intermediate wheels; the mobile switching mechanism is provided with a driving part, the driving part is used to drive the The transmission gear rotates;

The phase-shifting assembly includes a number of driven parts, a number of transmission intermediate wheels are respectively connected to a number of driven parts in a one-to-one correspondence, and the several driven parts are respectively used to be connected to corresponding phase shifters to achieve alignment. Adjustment of phase shifter tilt angle.

A further improvement is that the mobile switching mechanism includes a transmission shaft and a position selection rack. Position selection fixing holes are provided at both ends of the position selection rack, and transmission gears are installed in the position selection fixation holes at both ends. The shaft passes through the position selection fixed hole and the hole of the transmission gear, and both ends are connected to the support frame respectively. The position selection rack is provided with a position selection input gear. The rotation of the position selection input gear can drive the position selection rack and The transmission gear slides along the axial direction of the transmission shaft.

A further improvement is that the transmission gear is provided with a round shaft elastic arm, the round shaft elastic arm can rotate in the position selection fixing hole of the position selection rack, and the end of the transmission gear is provided with an undercut. Inverted buckle snaps onto the position selection fixing hole.

A further improvement is that the driving member includes a transmission input bevel gear and a first bevel gear. The first bevel gear is sleeved on the transmission shaft. The rotation of the first bevel gear can drive the transmission shaft and the transmission gear to rotate synchronously. , the rotation of the transmission input bevel gear can drive the first bevel gear to rotate.

A further improvement is that the second guide shaft is provided with a plurality of slots, the backstop surface of the transmission intermediate wheel is provided with a snap ring, and the second guide shaft passes through several transmission wheels one by one. After inserting the hole in the moving intermediate wheel, use the snap ring to snap it into the corresponding slot on the second guide shaft.

A further improvement is that the phase shift assembly includes a fixed seat located on one side of the position selection transmission assembly, the follower includes an internal threaded strip and an external threaded column, and the internal threaded strip is installed in the guide groove of the fixed seat, The externally threaded column is placed below the internally threaded strip. The rotation of the transmission intermediate wheel can drive the externally threaded column to rotate. The rotation of the externally threaded column can drive the internally threaded strip to slide in the guide groove.

A further improvement is that the driven member further includes a third bevel gear, the transmission intermediate wheel is provided with a second bevel gear, the second bevel gear is meshed with the corresponding third bevel gear, and the third bevel gear is meshed with the corresponding third bevel gear. The bevel gear passes through the first circular hole of the fixed base, the through hole of the external threaded column and the second circular hole of the fixed base in sequence, and the third bevel gear and the external threaded column are transmittably connected, and the third bevel gear It can rotate within the first round hole and the second round hole of the fixed base.

A further improvement is that a damping ring is provided between the third bevel gear and the first circular hole of the fixed seat.

A further improvement is that a spring buckle is provided at the rear of the third bevel gear, and the spring buckle is buckled on the second round hole end surface of the fixed seat to prevent the third bevel gear from loosening from the fixed seat.

A second aspect of the present invention provides a base station antenna, which includes an electrical downtilt adjustment device as described in any one of the first aspects.

Beneficial effects of the present invention:

In the present invention, since the transmission shaft passes through the holes of the transmission gear and the first bevel gear respectively, and the transmission shaft and the holes of the first bevel gear and the transmission gear are connected by splines, the rotation of the transmission input bevel gear can drive the first bevel gear. The rotation of the bevel gear drives the transmission shaft and transmission teeth synchronized rotation of wheels. The rotation of the transmission gear can drive the rotation of a certain transmission intermediate wheel that meshes with it. Since the second bevel gear of the transmission intermediary wheel is meshed with the third bevel gear, and under the action of the snap ring, the transmission intermediary wheel has been fixed along the axial direction of the second guide shaft and can only move along the axis center of the second guide shaft. Rotate, and the rotation of the transmission intermediate wheel can drive the rotation of the third bevel gear, thereby driving the internal thread bar to move forward and backward in the guide groove. The end of the internal thread bar can be connected with the corresponding phase shifter, thereby realizing the shift. Adjustment of the phaser tilt angle.

The electric downtilt angle adjustment device provided by the invention has the advantages of simple structure, convenient manufacturing, low cost, light weight, small size and reliable quality.

In the present invention, the support frame is provided with an anti-detachment hook, and both ends of the transmission shaft are provided with annular grooves. The anti-detachment hook of the support frame is inserted into the annular groove of the transmission shaft, thereby preventing the support frame from falling off and enabling the position selection transmission. The components form a whole, which facilitates the turnover and installation of this position-selected transmission component as a module on the production line.

By adding a damping ring between the third bevel gear and the first round hole of the fixed base, the present invention can prevent the third bevel gear from sliding forward and backward due to vibration during product transportation when the third bevel gear is in a non-working state. A spring buckle is provided, and the spring buckle is buckled on the end surface of the second round hole of the fixed seat, which can prevent the third bevel gear from loosening from the fixed seat, so that the phase-shifting assembly can be formed into a whole, which facilitates the production of the phase-shifting assembly as a module. Online turnaround and installation.

Description of the drawings

Figure 1 is a schematic structural diagram of an electric tilt angle adjustment device according to an embodiment of the present invention;

Figure 2 is an exploded schematic diagram of the position selection transmission assembly of an electric downtilt angle adjustment device according to an embodiment of the present invention;

Figure 3 is a transmission intermediate wheel of an electric downtilt angle adjustment device according to an embodiment of the present invention. Assembly explosion diagram;

Figure 4 is a schematic structural diagram of the position selection transmission assembly of an electric downtilt angle adjustment device according to an embodiment of the present invention;

Figure 5 is an exploded schematic diagram of the phase-shifting component of an electrical tilt angle adjustment device according to an embodiment of the present invention;

Figure 6 is a cross-sectional view of the phase-shifting component of an electrical downtilt angle adjustment device according to an embodiment of the present invention;

FIG. 7 is a schematic diagram 2 of the structure of an electric tilt angle adjustment device according to an embodiment of the present invention.

Explanation of reference symbols:
1. Position selection transmission component; 2. Phase shifting component; 10. Position selection input gear; 11. Transmission input bevel gear; 12. Support frame; 13. Position selection rack; 14. Transmission gear; 141. Round shaft spring arm ; 142. Undercut; 15. Transmission shaft; 16. First bevel gear; 17. First guide shaft; 18. Transmission intermediate wheel; 181. Second bevel gear; 182. Stop surface; 19. Second guide shaft ; 191. Card slot; 20. Snap ring; 21. Fixed seat; 211. First round hole; 212. Second round hole; 22. Third bevel gear; 221. Spring buckle; 23. Externally threaded column; 24. Internal thread strip; 25. Damping ring.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention and do not limit the scope of the present invention.

It should be noted that when an element is referred to as being "fixed to", "disposed on", "anchored to" or "mounted on" another element, it can be directly on the other element or intervening elements may also be present. . When an element is said to be "connected" to another element, it can be directly connected to the other element or there may also be intervening elements present. Furthermore, when one element is considered to be "drivingly connected" to another element, it only suffices that the two can achieve power transmission. The specific implementation method can be implemented using the existing technology, and is no longer redundant here. When a component is perpendicular or approximately perpendicular to another component, it means that the ideal state of the two components is perpendicular. However, due to the influence of manufacturing and assembly, there may be a certain vertical error. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation manner.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which the invention belongs. The terminology used herein in the description of the invention is for the purpose of describing specific embodiments only and is not intended to limit the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The "first" and "second" mentioned in the present invention do not represent the specific number or order, but are only used for the distinction of names.

The embodiments of the present invention will be described in detail below in conjunction with Figures 1 to 7:

The first embodiment of the present invention proposes an electric tilt angle adjustment device. As shown in Figure 1, the application scheme of the present invention consists of the following components:

The electric downtilt angle adjustment device includes a position selection transmission component 1 and a phase shift component 2. The position selection transmission component 1 can complete the position selection of any transmission in the phase shift component 2. The phase shift component 2 can drive the corresponding phase shifter (not shown) to adjust the inclination angle. The position selection transmission assembly 1 includes a support frame 12, a mobile switching mechanism, a transmission gear 14, and a second guide shaft 19; A second guide shaft 19 is installed. Several transmission intermediary wheels 18 are installed at intervals on the second guide shaft 19. The transmission gear 14 is used to drive the transmission intermediary wheels 18 to rotate. The support frame 12 is equipped with a mobile switch. Mechanism, the movement switching mechanism is used to drive the transmission gear 14 to move and switch among several transmission intermediary wheels 18; the movement switching mechanism is provided with a driving member, and the driving member is used to drive the transmission gear 14 to rotate;

The phase-shifting assembly 2 includes several driven parts, and several transmission intermediary wheels 18 are respectively connected with the driven parts in one-to-one correspondence. The several driven parts are respectively used to connect with the corresponding phase shifters. Realize the adjustment of the phase shifter tilt angle.

The mobile switching mechanism includes a transmission shaft 15 and a position selection rack 13. The position selection rack 13 is provided with position selection fixing holes 131 at both ends. The position selection fixation holes 131 at both ends are respectively equipped with transmission gears 14. The transmission shaft 15 passes through the position selection fixed hole 131 and the hole of the transmission gear 14, and both ends are connected to the support frame 12 respectively. The position selection input gear 10 is provided on the position selection rack 13, and the position selection input gear 10 is The rotation can drive the position selection rack 13 and the transmission gear 14 to slide along the axial direction of the transmission shaft 15 .

The driving member includes a transmission input bevel gear 11 and a first bevel gear 16. The first bevel gear 16 is sleeved on the transmission shaft 15. The rotation of the first bevel gear 16 can drive the transmission shaft 15 and the transmission gear 14. By synchronous rotation, the rotation of the transmission input bevel gear 11 can drive the first bevel gear 16 to rotate.

Specifically, as shown in Figure 2, the transmission gear 14 is symmetrically installed on the position selection fixing holes 131 at both ends of the position selection rack 13. The transmission gear 14 is provided with a circular axis elastic arm 141. The circular shaft elastic arm 141 of the transmission gear 14 can rotate in the position selection fixing hole 131 of the position selection rack 13, and the end of the transmission gear 14 is provided with an undercut 142, and the undercut 142 can be buckled in the position selection fixing hole. 131 on.

Further, the transmission shaft 15 passes through the holes of the transmission gear 14, the first bevel gear 16 and the other transmission gear 14 respectively. The transmission shaft 15 can use a spline structure to cooperate with the transmission gear 14 and the first bevel gear 16, so The rotation of the first bevel gear 16 can drive the transmission shaft 15 and the transmission gear 14 to rotate synchronously.

Furthermore, the support frame 12 is also provided with a first guide shaft 17 which passes through both ends of the position selection rack 13. The transmission gear 14 as a whole slides freely along the axial direction of the transmission shaft 15 (or the first guide shaft 17). Through the joint action of the first guide shaft 17 and the transmission shaft 15, the sliding to the position selection rack 13 is made more stable. .

Referring to FIG. 3 , the second guide shaft 19 is provided with a plurality of slots 191 , and the stop surface 182 of the transmission intermediary wheel 18 is provided with a snap ring 20 , and the second guide shafts 19 pass through them one by one. After removing the hole of the transmission intermediary wheel 18, the snap ring 20 is then correspondingly buckled into the corresponding slot 191 of the second guide shaft 19, so that the transmission intermediary wheel 18 is evenly and symmetrically distributed on both sides of the second guide shaft 19. The transmission intermediary wheel 18 can freely rotate along the axis of the first guide shaft 17, and the snap ring 20 is placed on the stop surface 182 of the transmission intermediary wheel 18 to prevent the transmission intermediary wheel 18 from moving along the axial direction of the second guide shaft 19. Slide the other side. Furthermore, the installation position and number of the snap ring 20 and the transmission intermediary wheel 18 can be adjusted according to the needs of realizing the antenna. The embodiment of the present invention uses 12 channels for illustration.

Referring to Figure 4, the support frame 12 is installed on the first guide shaft 17, the second guide shaft 19 and Both ends of the transmission shaft 15 play a role in supporting and positioning the first guide shaft 17 , the second guide shaft 19 and the transmission shaft 15 .

Further, the transmission shaft 15 can rotate freely in the fixed holes at both ends of the support frame 12. The support frame 12 is provided with an anti-detachment hook 121. The two ends of the transmission shaft 15 are provided with annular grooves 151. The anti-detachment hooks 121 of the support frame 12 are provided. The decoupling 121 is inserted into the annular groove 151 of the transmission shaft 15 to prevent the support frame 12 from falling off, so that the position selection transmission assembly 1 forms a whole, which facilitates the turnover and installation of the position selection transmission assembly 1 as a module on the production line.

Further, the rotation of the position selection input gear 10 can drive the position selection rack 13 to slide along the axial direction of the transmission shaft 15 (or the first guide shaft 17), and the sliding of the position selection rack 13 can drive the buckle to fix the position selection. The transmission gear 14 on the hole 131 moves accordingly. During the sliding process of the position selection rack 13, the transmission gear 14 can mesh with the transmission intermediary wheel 18 fixed on the second guide shaft 19 one by one, thereby completing the adjustment of different positions. Position selection of the position transmission intermediate wheel 18.

Further, the number of transmission gears 14 can be designed to be one or several according to the efficiency requirements of gear shifting (the number of transmission gears 14 in this example is 2). When one of the transmission gears 14 meshes with any one of the transmission intermediate wheels 18, The transmission gears 14 at other positions need to be completely separated from the transmission intermediary wheel 18 .

Referring to Figures 5 and 6, the phase shift assembly 2 includes a fixed seat 21 located on one side of the position selection transmission assembly 1, and the follower includes an internal threaded strip 24 and an external threaded column 23. The internal threaded strip 24 It is installed in the guide groove of the fixed base 21. The internal threaded bar 24 can slide freely in the guide groove. The external threaded post 23 is placed below the internal threaded bar 24. The space between the external threaded post 23 and the internal threaded bar 24 is as shown in this example. In addition to the thread transmission method, other transmission methods such as worm gear screw can also be used. The rotation of the transmission intermediate wheel 18 can drive the external thread column 23 to rotate, so The rotation of the externally threaded column 23 can drive the internally threaded strip 24 to slide in the guide groove.

Further, the driven member also includes a third bevel gear 22, and a second bevel gear 181 is provided on the transmission intermediate wheel 18. The second bevel gear 181 is meshed with the corresponding third bevel gear 22, so A damping ring 25 is provided between the third bevel gear 22 and the first circular hole 211 of the fixed base 21. The third bevel gear 22 passes through the damping ring 25, the first circular hole 211 of the fixed base 21, and the external threaded column 23 in sequence. through hole and the second circular hole 212 of the fixed seat 21, and the third bevel gear 22 and the external thread column 23 are transmittably connected. Specifically, a spline can be applied between the third bevel gear 22 and the external thread column 23. The structure of the key cooperates to achieve a transmission connection. The third bevel gear 22 can freely rotate in the first round hole 211 and the second round hole 212 of the fixed seat 21. The rotation of the third bevel gear 22 can drive the external thread column 23 to rotate together. , and the rotation of the externally threaded column 23 can drive the internally threaded bar 24 to move forward and backward in the guide groove of the fixed base 21 .

In this embodiment, by adding a damping ring 25 between the third bevel gear 22 and the first circular hole 211 of the fixed base 21, it can prevent the third bevel gear 22 from vibrating in the non-working state, such as during product transportation, causing internal thread failure. The bar 24 slides back and forth.

Preferably, a spring buckle 221 can be designed at the rear of the third bevel gear 22. The spring buckle 221 is buckled on the end surface of the second round hole 212 of the fixed base 21 to prevent the third bevel gear 22 from loosening from the fixed base 21. out, the phase-shifting component 2 is formed into a whole, which facilitates the turnover and installation of the phase-shifting component 2 as a module on the production line.

The working principle of the present invention: Since the transmission shaft 15 passes through the holes of the transmission gear 14 and the first bevel gear 16 respectively, and the transmission shaft 15 and the holes of the first bevel gear 16 and the transmission gear 14 adopt spline connection, so The rotation of the transmission input bevel gear 11 can drive the rotation of the first bevel gear 16, thereby driving the transmission shaft 15 and the transmission gear 14 to rotate synchronously. pass The rotation of the moving gear 14 can drive the rotation of a certain transmission intermediate wheel 18 meshed with it. Further, since the second bevel gear 181 of the transmission intermediary wheel 18 is meshed with the third bevel gear 22, and under the action of the snap ring 20, the transmission intermediary wheel 18 has been fixed along the axial direction of the second guide shaft 19, only It can rotate along the axis center of the second guide shaft 19, and the rotation of the transmission intermediate wheel 18 can drive the rotation of the third bevel gear 22, thereby driving the internal thread bar 24 to move forward and backward in the guide groove. The end of the internal thread bar 24 The part can be connected with the corresponding phase shifter (not shown), thereby realizing the adjustment of the inclination angle of the phase shifter (not shown).

Referring to Figure 7, in some other embodiments of the present invention, the phase-shifting component 2 can be designed as one channel or as a group of multiple channels (this example uses 2 channels as a group for illustration), according to the actual needs of the antenna. , the phase-shifting component 2, the transmission intermediate wheel 18 and the snap ring 20 can be added or deleted accordingly to realize the modularization of the product, improve the applicability of the product and save costs.

The second embodiment of the present invention provides a base station antenna. The base station antenna includes an electrical downtilt adjustment device as described in any of the above-mentioned first embodiments. Since other parts of the structure of the base station antenna belong to the prior art, Persons skilled in the art can realize this by referring to the existing technology, and this embodiment will not be described in detail here.

The technical features of the above embodiments can be combined in any way. To simplify the description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, all possible combinations should be used. It is considered to be within the scope of this manual.

The above-described embodiments only express specific implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the patent scope of the present invention. It should be noted that, for those of ordinary skill in the art, without departing from the concept of the present invention, Provided that several modifications and improvements can be made, these all belong to the protection of the present invention.

Claims

An electric downtilt angle adjustment device includes a position selection transmission component and a phase shift component. It is characterized in that the position selection transmission component includes a support frame, a mobile switching mechanism, a transmission gear, and a second guide shaft; the support frame is installed on There is a second guide shaft. Several transmission intermediate wheels are installed at intervals on the second guide shaft. The transmission gears are used to drive the transmission intermediary wheels to rotate. A mobile switching mechanism is installed on the support frame. The mobile switching mechanism It is used to drive the transmission gear to move and switch among several transmission intermediary wheels; the mobile switching mechanism is provided with a driving part, and the driving part is used to drive the transmission gear to rotate;

The phase-shifting assembly includes a number of driven parts, a number of transmission intermediate wheels are respectively connected to a number of driven parts in a one-to-one correspondence, and the several driven parts are respectively used to be connected to corresponding phase shifters to achieve alignment. Adjustment of phase shifter tilt angle.
An electric downtilt angle adjustment device according to claim 1, characterized in that the mobile switching mechanism includes a transmission shaft and a position selection rack, and position selection fixing holes are respectively provided at both ends of the position selection rack. The position selection fixed holes at the ends are respectively equipped with transmission gears. The transmission shaft passes through the position selection fixed holes and the holes of the transmission gear and both ends are connected to the support frame respectively. The position selection rack is provided with a position selection input gear, so The rotation of the position selection input gear can drive the position selection rack and the transmission gear to slide along the axial direction of the transmission shaft.
An electric downtilt angle adjustment device according to claim 2, characterized in that the transmission gear is provided with a circular shaft elastic arm, and the circular shaft elastic arm can rotate in the position selection fixed hole of the position selection rack. , and the end of the transmission gear is provided with an undercut, and the undercut is buckled on the position selection fixing hole.
An electric downtilt angle adjustment device according to claim 2, characterized in that the driving member includes a transmission input bevel gear and a first bevel gear, and the first bevel gear is sleeved On the transmission shaft, the rotation of the first bevel gear can drive the transmission shaft and the transmission gear to rotate synchronously, and the rotation of the transmission input bevel gear can drive the first bevel gear to rotate.
An electric downtilt angle adjustment device according to claim 1, characterized in that, the second guide shaft is provided with a plurality of slots, and a snap ring is provided on the backstop surface of the transmission intermediate wheel, and the After the second guide shaft passes through the holes of several transmission intermediate wheels one by one, it is then buckled in the corresponding slot on the second guide shaft with a snap ring.
An electric downtilt angle adjustment device according to claim 1, wherein the phase-shifting component includes a fixed seat located on one side of the position selection transmission component, and the follower includes an internally threaded strip and an externally threaded column, The internally threaded strip is installed in the guide groove of the fixed base, the externally threaded column is placed below the internally threaded strip, the rotation of the transmission intermediary wheel can drive the externally threaded column to rotate, and the rotation of the externally threaded column can drive the externally threaded column. The internal thread strip slides in the guide groove.
An electric downtilt angle adjustment device according to claim 6, characterized in that the driven member further includes a third bevel gear, the transmission intermediate wheel is provided with a second bevel gear, and the second bevel gear The third bevel gear is meshed with the corresponding third bevel gear, and the third bevel gear passes through the first round hole of the fixed seat, the through hole of the external thread column and the second round hole of the fixed seat in sequence, and the third bevel gear is connected with the external thread There is a transmission connection between the columns, and the third bevel gear can rotate in the first circular hole and the second circular hole of the fixed base.
An electric downtilt angle adjustment device according to claim 7, characterized in that a damping ring is provided between the third bevel gear and the first round hole of the fixed seat.
An electric downward tilt angle adjustment device according to claim 7, characterized in that a spring buckle is provided at the rear of the third bevel tooth, and the spring buckle is buckled on the end surface of the second round hole of the fixed seat. To prevent the third bevel gear from loosening from the fixed seat.
A base station antenna, characterized by comprising an electrical downtilt angle adjustment device as claimed in any one of claims 1-9.