Low Profile Base Station Antenna Gear

Abstract

The utility model relates to a low-profile base station antenna transmission device, including a bracket, a drive unit, a first motion unit and a second motion unit, the bracket includes a frame, the drive unit includes a motor and a first gear, the first motion unit includes a position selection component and a transmission component, the position selection component includes a position selection screw, a second gear and a position selection nut, the transmission component includes a transmission shaft, a third gear and a fourth gear, the second motion unit includes a plurality of adjustment components, each adjustment component includes an adjustment screw, a fifth gear, a sixth gear, a seventh gear and an adjustment nut, the frame surface surrounded by the frame is perpendicular to the Z-axis direction, and the central axis of the motor, the central axis of the position selection screw, the central axis of the transmission shaft, and the central axis of the adjustment screw are located in the same plane. The base station antenna transmission device of the utility model has a small thickness dimension, and when in use, it can reduce the wind load received, thereby improving the life and safety of the base station antenna transmission device.

Description

Technical Field

[0001] The utility model relates to the technical field of base station antenna equipment, in particular to a low-profile base station antenna transmission device. Background Art

[0002] A base station antenna refers to an antenna device used for wireless communications, and its main function is to transmit wireless signals from the base station to the user terminal device. The role of the base station antenna is very important, and it directly affects the transmission quality and distance range of the communication signal. Base station antennas are usually installed on high towers or buildings to ensure stable signal transmission and maximize the coverage area. The radiation angle of the base station antenna can be adjusted by a transmission device to achieve the radiation effect of changing the vertical beam of the antenna. The thickness of the transmission device of the base station antenna in the prior art is usually large, and the greater the thickness of the transmission device, the greater the wind load it is subjected to. How to reduce the thickness of the transmission device of the base station antenna as much as possible is a technical problem that needs to be solved urgently in this field. Utility Model Content

[0003] Therefore, the technical problem to be solved by the present invention is to provide a transmission device for a base station antenna with a relatively small thickness.

[0004] In order to solve the above technical problems, the utility model provides a low-profile base station antenna transmission device, comprising:

[0005] A support, the support comprising a frame;

[0006] A driving unit, the driving unit comprising a motor and a first gear, wherein the first gear is connected to a power output shaft of the motor;

[0007] A first motion unit, the first motion unit includes a positioning assembly and a transmission assembly arranged in sequence along the X-axis direction, the positioning assembly includes a positioning screw, a second gear and a positioning nut, the positioning screw extends along the Y-axis direction and is rotatably connected to the frame around the Y-axis direction, the second gear is connected to the positioning screw, the second gear and the first gear are mutually transmitted, the positioning screw rotates unidirectionally with the forward rotating motor, the positioning nut is connected to the positioning screw, and the positioning nut performs linear reciprocating motion along the Y-axis direction with the unidirectional rotating positioning screw, the transmission assembly includes a transmission shaft, a third gear and a fourth gear, the transmission shaft extends along the Y-axis direction, the third gear is connected to the transmission shaft, the third gear and the first gear are mutually transmitted, the transmission shaft rotates unidirectionally with the reversed motor, the fourth gear is connected to the transmission shaft and the positioning nut, the fourth gear can rotate around the Y-axis direction with the transmission shaft and can reciprocate linearly along the Y-axis direction with the positioning nut, and the fourth gear includes a spur gear portion;

[0008] A second motion unit, the second motion unit includes a plurality of adjustment components arranged in sequence along the Y-axis direction, each of the adjustment components includes an adjustment screw, a fifth gear, a sixth gear, a seventh gear and an adjustment nut, the adjustment screw extends along the X-axis direction and is rotatably connected to the frame around the X-axis direction, the fifth gear is connected to the adjustment screw, the fifth gear has a bevel gear portion, the sixth gear is rotatably connected to the frame around the Y-axis direction and is located on one side of the fifth gear in the Y-axis direction, the sixth gear has a bevel gear portion and a spur gear portion, the bevel gear portion of the sixth gear is meshed with the bevel gear portion of the fifth gear, the seventh gear is rotatably connected to the frame around the Y-axis direction and is located on the other side of the fifth gear in the Y-axis direction, the seventh gear has a bevel gear portion and a spur gear portion, the bevel gear portion of the seventh gear is meshed with the bevel gear portion of the fifth gear;

[0009] The frame surface surrounded by the frame is perpendicular to the Z-axis direction, the central axis of the motor, the central axis of the positioning screw, the central axis of the transmission shaft, and the central axis of the positioning screw are located in the same plane, the positioning screw is arranged on one side of the transmission shaft in the X-axis direction, and the positioning screw is arranged on the other side of the transmission shaft in the X-axis direction;

[0010] When the fourth gear moves linearly, it switches to transmit the sixth gear and the seventh gear. When the fourth gear is meshed with the sixth gear, the spur gear part of the fourth gear and the spur gear part of the sixth gear are meshed with each other and drive the adjusting screw to rotate forward. When the fourth gear is meshed with the seventh gear, the spur gear part of the fourth gear and the spur gear part of the seventh gear are meshed with each other and drive the adjusting screw to rotate reversely.

[0011] Furthermore, the power output shaft of the motor extends along the X-axis direction, the first gear and the third gear are transitionally connected through an eighth gear, the eighth gear is rotatably connected to the frame around the Y-axis direction, the second gear and the eighth gear are respectively arranged on both sides of the Y-axis direction of the first gear, and the third gear is arranged on one side of the X-axis direction of the eighth gear, the first gear includes a bevel gear portion, the second gear includes a bevel gear portion, the third gear includes a cylindrical gear portion, and the eighth gear includes a fan gear portion and a cylindrical gear portion, the bevel gear portion of the first gear is respectively meshed with the bevel gear portion of the second gear and the bevel gear portion of the eighth gear, and the cylindrical gear portion of the third gear is meshed with the cylindrical gear portion of the eighth gear.

[0012] Furthermore, the bracket also includes a U-shaped piece, which is arranged inside the frame and connected to the edge of the frame. The U-shaped piece has a groove, and the notch of the groove faces the transmission shaft. The first gear, the second gear and the eighth gear are all arranged in the groove, the first gear is close to the bottom of the groove, and the second gear and the eighth gear are respectively close to the two groove walls of the groove.

[0013] Furthermore, the motor is installed outside the frame.

[0014] Furthermore, a forward spiral groove and a reverse spiral groove are processed on the positioning screw, the forward spiral groove and the reverse spiral groove are staggered and connected at both ends to form a bidirectional groove, the positioning nut includes a positioning drive block and a positioning drive sleeve, the positioning drive block is arranged in the bidirectional groove, the positioning drive sleeve is arranged on the outside of the positioning screw and limits the positioning drive block in the bidirectional groove, the positioning drive sleeve is connected to the fourth gear and the positioning drive sleeve and the fourth gear can rotate relative to each other around the Y-axis direction.

[0015] Furthermore, the position selection drive sleeve has a connecting plate, the connecting plate is provided with a hinge hole, the fourth gear is provided with a connecting shaft, and the connecting shaft is connected to the hinge hole of the connecting plate.

[0016] Furthermore, the positioning screw has a gear supporting portion, the second gear is connected to the gear supporting portion of the positioning screw, and the second gear drives the positioning screw to rotate through a ratchet. The transmission shaft has a gear supporting portion, and the third gear is connected to the gear supporting portion of the transmission shaft, and the third gear drives the transmission shaft to rotate through a ratchet.

[0017] Furthermore, cross sections of the inner holes of the transmission shaft and the fourth gear are both irregular shapes.

[0018] Further, all the sixth gears and the seventh gears of the second motion unit are connected to the same supporting shaft.

[0019] Furthermore, the bracket also includes a support plate, which is arranged inside the frame and connected to the edge of the frame, and the support plate extends along the Y-axis direction. The support plate has a plurality of grooves arranged in sequence along the Y-axis direction, and the notches of the grooves face the transmission shaft. A plurality of adjusting screws respectively pass through the bottoms of the plurality of grooves, and the fifth gear, the sixth gear and the seventh gear are arranged in the grooves, the fifth gear is close to the bottom of the groove, and the sixth gear and the seventh gear are respectively close to the two groove walls of the groove.

[0020] The above-mentioned technical scheme of the utility model includes the following advantages compared with the prior art: the low-profile base station antenna transmission device described in the utility model, on the one hand, adopts the forward and reverse rotation of a motor to drive the position selection and adjustment respectively, thereby reducing the cost, weight and volume of the base station antenna transmission device; on the other hand, by configuring the adjustment component to include a positioning screw, an adjustment nut, a fifth gear, a sixth gear and a seventh gear, the central axis of the positioning screw and the transmission shaft can be arranged in the same plane, so that the thickness dimension of the base station antenna transmission device is relatively small, and when in use, the wind load can be reduced, thereby improving the life and safety of the base station antenna transmission device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments of the utility model in combination with the accompanying drawings.

[0022] Figure 1 A top view of the transmission device of the base station antenna disclosed in the utility model;

[0023] Figure 2 A three-dimensional diagram of the transmission device of the base station antenna disclosed in the utility model;

[0024] Figure 3 It is a transmission schematic diagram of the motor, the position selection screw and the transmission shaft disclosed in the utility model;

[0025] Figure 4 It is a schematic diagram of the position selection screw and the second gear disclosed in the utility model;

[0026] Figure 5 It is a schematic diagram of the transmission shaft and the third gear disclosed in the utility model;

[0027] Figure 6 It is a schematic diagram of the position selection nut and the fourth gear disclosed in the utility model;

[0028] Figure 7 The utility model discloses a transmission schematic diagram of a position selection component, a transmission component and a position adjustment component.

[0029] Description of the accompanying drawings in the specification: 11, frame; 12, U-shaped member; 13, support plate;

[0030] 2. driving unit; 21. motor; 22. first gear;

[0031] 3. First moving unit; 31. Positioning screw; 311. First gear support; 32. Second gear; 321. First ratchet; 33. Positioning nut; 331. Positioning drive block; 332. Positioning drive sleeve; 333. Connecting plate; 34. Transmission shaft; 341. Second gear support; 35. Third gear; 351. Second ratchet; 36. Fourth gear; 361. Connecting shaft; 37. Eighth gear;

[0032] 4. Second motion unit; 41. Adjusting screw; 42. Fifth gear; 43. Sixth gear; 44. Seventh gear; 45. Adjusting nut; 46. Support shaft. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0034] Embodiment 1

[0035] See also Figures 1 to 7 As shown, the utility model discloses a low-profile base station antenna transmission device, comprising:

[0036] A bracket including a frame 11;

[0037] A driving unit 2, the driving unit 2 comprising a motor 21 and a first gear 22, the first gear 22 being connected to a power output shaft of the motor 21;

[0038] The first motion unit 3 includes a positioning assembly and a transmission assembly arranged in sequence along the X-axis direction. The positioning assembly includes a positioning screw 31, a second gear 32 and a positioning nut 33. The positioning screw 31 extends along the Y-axis direction and is connected to the frame 11 rotatably around the Y-axis direction. The second gear 32 is connected to the positioning screw 31. The second gear 32 and the first gear 22 are mutually transmitted. The positioning screw 31 rotates unidirectionally with the forward-rotating motor 21. The positioning nut 33 is connected to the positioning screw 31. The positioning nut 33 rotates along the unidirectionally rotating positioning screw 31. The transmission assembly includes a transmission shaft 34, a third gear 35 and a fourth gear 36. The transmission shaft 34 extends along the Y-axis direction. The third gear 35 is connected to the transmission shaft 34. The third gear 35 and the first gear 22 mutually transmit each other. The transmission shaft 34 rotates unidirectionally with the reversed motor 21. The fourth gear 36 connects the transmission shaft 34 and the position selection nut 33. The fourth gear 36 can rotate around the Y-axis direction with the transmission shaft 34 and can reciprocate linearly along the Y-axis direction with the position selection nut 33. The fourth gear 36 includes a spur gear portion.

[0039] The second motion unit 4 includes a plurality of positioning components arranged in sequence along the Y-axis direction, each of the positioning components includes a positioning screw 41, a fifth gear 42, a sixth gear 43, a seventh gear 44 and a positioning nut 45, the positioning screw 41 extends along the X-axis direction and is rotatably connected to the frame 11 around the X-axis direction, the fifth gear 42 is connected to the positioning screw 41, the fifth gear 42 has a bevel gear portion, the sixth gear 43 is rotatably connected to the frame 11 around the Y-axis direction and is positioned On one side of the fifth gear 42 in the Y-axis direction, the sixth gear 43 has a bevel gear portion and a spur gear portion, and the bevel gear portion of the sixth gear 43 is meshed with the bevel gear portion of the fifth gear 42; the seventh gear 44 is rotatably connected to the frame 11 around the Y-axis direction and is located on the other side of the fifth gear 42 in the Y-axis direction; the seventh gear 44 has a bevel gear portion and a spur gear portion, and the bevel gear portion of the seventh gear 44 is meshed with the bevel gear portion of the fifth gear 42;

[0040] The frame surface surrounded by the frame 11 is perpendicular to the Z-axis direction, the central axis of the motor 21, the central axis of the positioning screw 31, the central axis of the transmission shaft 34, and the central axis of the positioning screw 41 are located in the same plane, the positioning screw 31 is arranged on one side of the transmission shaft 34 in the X-axis direction, and the positioning screw 41 is arranged on the other side of the transmission shaft 34 in the X-axis direction;

[0041] When the fourth gear 36 moves linearly, it switches to transmit the sixth gear 43 and the seventh gear 44. When the fourth gear 36 is meshed with the sixth gear 43, the spur gear portion of the fourth gear 36 and the spur gear portion of the sixth gear 43 are meshed with each other and drive the adjusting screw 41 to rotate forwardly. When the fourth gear 36 is meshed with the seventh gear 44, the spur gear portion of the fourth gear 36 and the spur gear portion of the seventh gear 44 are meshed with each other and drive the adjusting screw 41 to rotate reversely.

[0042] In the above, the cylindrical gear portion of the sixth gear 43 is connected to the large end of its bevel gear portion, the cylindrical gear portion of the seventh gear 44 is connected to the large end of its bevel gear portion, and the small end of the bevel gear portion of the sixth gear 43 is opposite to the small end of the bevel gear portion of the seventh gear 44. The fourth gear 36 alternately meshes with the cylindrical gear portion of the sixth gear 43 and the cylindrical gear portion of the seventh gear 44 when translating along the Y-axis direction. When the sixth gear 43 rotates, it drives the adjustment screw 41 to rotate forward, and when the seventh gear 44 rotates, it drives the adjustment screw 41 to rotate reversely. When the power output shaft of the motor 21 rotates forward, the selection screw 31 rotates, and the transmission shaft 34 does not rotate. The rotation of the selection screw 31 drives the selection nut 33 to reciprocate along the Y-axis direction until the fourth gear 36 is meshed with the required sixth gear 43 or seventh gear 44. When the power output shaft of the motor 21 is reversed, the transmission shaft 34 rotates, and the position selection screw 31 does not rotate. The transmission shaft 34 drives the fourth gear 36 to rotate, and the fourth gear 36 does not drive the position selection nut 33 to rotate, and the fourth gear 36 drives the sixth gear 43 or the seventh gear 44 to rotate, and then drives the fifth gear 42 to rotate, and then drives the adjustment screw 41 to rotate, and then drives the adjustment nut 45 to move along the X-axis direction. On the one hand, the forward and reverse rotation of a motor is used to drive the position selection and adjustment respectively, which reduces the cost, weight and volume of the base station antenna transmission device. On the other hand, by setting the adjustment component to include the adjustment screw, the adjustment nut, the fifth gear, the sixth gear and the seventh gear, the central axis of the adjustment screw and the transmission shaft can be arranged in the same plane, so that the thickness of the base station antenna transmission device is small. When in use, it can reduce the wind load, thereby improving the life and safety of the base station antenna transmission device.

[0043] In the preferred implementation mode of the present embodiment, the power output shaft of the motor 21 extends along the X-axis direction, the first gear 22 and the third gear 35 are transitionally connected by the eighth gear 37, the eighth gear 37 is rotatably connected to the frame 11 around the Y-axis direction, the second gear 32 and the eighth gear 37 are respectively arranged on both sides of the Y-axis direction of the first gear 22, and the third gear 35 is arranged on one side of the X-axis direction of the eighth gear 37, the first gear 22 includes a bevel gear portion, the second gear 32 includes a bevel gear portion, the third gear 35 includes a cylindrical gear portion, and the eighth gear 37 includes a fan gear portion and a cylindrical gear portion, the bevel gear portion of the first gear 22 is respectively meshed with the bevel gear portion of the second gear 32 and the bevel gear portion of the eighth gear 37, and the cylindrical gear portion of the third gear 35 is meshed with the cylindrical gear portion of the eighth gear 37.

[0044] In the above, in order to make the forces on both sides of the first gear 22 more balanced, the second gear 32 also includes a cylindrical gear part, but the cylindrical gear part of the second gear 32 does not mesh with the outside, the cylindrical gear part of the second gear 32 is connected to the large end of its bevel gear part, the cylindrical gear part of the eighth gear 37 is connected to the large end of its bevel gear part, and the small end of the bevel gear part of the second gear 32 is opposite to the small end of the bevel gear part of the eighth gear 37. The mutual transmission of the motor 21, the position selection screw 31 and the transmission shaft 34 is realized by the first gear 22, the second gear 32, the third gear 35 and the eighth gear 37.

[0045] In the preferred implementation manner of the present embodiment, the bracket further comprises a U-shaped member 12, the U-shaped member 12 is arranged inside the frame 11 and connected to the frame edge, the U-shaped member 12 has a groove, the groove opening of the groove faces the transmission shaft 34, the first gear 22, the second gear 32 and the eighth gear 37 are all arranged in the groove, the first gear 22 is close to the bottom of the groove, the second gear 32 and the eighth gear 37 are respectively close to the two groove walls of the groove.

[0046] The groove bottom of the U-shaped member 12 is connected to the inside of the frame 11, one side groove wall of the U-shaped member 12 is also connected to the inside of the frame 11, and the positioning screw 31 passes through the other side groove wall of the U-shaped member 12. By connecting the U-shaped member to the U-shaped frame, the structure of the frame 11 itself can be relatively simple.

[0047] In a preferred implementation manner of this embodiment, the motor 21 is installed outside the frame 11 .

[0048] The motor 21 is installed outside the frame 11, and the power output shaft of the motor 21 passes through the frame of the frame 11 and enters the inner side of the frame 11, thereby transmitting power to the first motion unit.

[0049] In the preferred implementation manner of the present embodiment, the positioning screw 31 is processed with a forward spiral groove and a reverse spiral groove, the forward spiral groove and the reverse spiral groove are staggered and connected at both ends to form a bidirectional groove, the positioning nut 33 includes a positioning drive block 331 and a positioning drive sleeve 332, the positioning drive block 331 is arranged in the bidirectional groove, the positioning drive sleeve 332 is sleeved on the outer side of the positioning screw 31 and limits the positioning drive block 331 in the bidirectional groove, the positioning drive sleeve 332 is connected to the fourth gear 36 and the positioning drive sleeve 332 and the fourth gear 36 can rotate relative to each other around the Y-axis direction.

[0050] When the position selection nut 33 moves to the end along the positive spiral groove in the positive direction of the Y axis, the position selection nut 33 rotates to the reverse thread groove because the ends of the positive spiral groove and the reverse spiral groove are connected. The position selection nut 33 continues to move to the head end along the reverse thread groove in the negative direction of the Y axis. Since the head end of the positive spiral groove is connected to the head end of the reverse spiral groove, the position selection nut 33 rotates to the positive thread groove. Thus, the position selection screw 31 can rotate unidirectionally and the position selection nut 33 can also reciprocate.

[0051] In the preferred implementation manner of this embodiment, the above-mentioned position selection drive sleeve 332 has a connecting plate 333, the above-mentioned connecting plate 333 is provided with a hinge hole, and the above-mentioned fourth gear 36 is provided with a connecting shaft 361, and the above-mentioned connecting shaft 361 is connected to the hinge hole of the above-mentioned connecting plate 333.

[0052] The position selection drive sleeve 332 and the fourth gear 36 can drive each other to translate but cannot drive each other to rotate.

[0053] In the preferred implementation mode of the present embodiment, the above-mentioned positioning screw 31 has a first gear support portion 311, the above-mentioned second gear 32 is connected to the first gear support portion 311 of the above-mentioned positioning screw 31, the above-mentioned second gear 32 drives the above-mentioned positioning screw 31 to rotate through the first ratchet 321, the above-mentioned transmission shaft 34 has a second gear support portion 341, the above-mentioned third gear 35 is connected to the second gear support portion 341 of the above-mentioned transmission shaft 34, and the above-mentioned third gear 35 drives the above-mentioned transmission shaft 34 to rotate through the second ratchet 351.

[0054] The first gear support part 311, the first ratchet 321 and the second gear 32 constitute a ratchet mechanism, and the second gear support part 341, the second ratchet 351 and the third gear 35 constitute a ratchet mechanism. Therefore, when the motor 21 rotates forward, the second gear 32 rotates and the selection screw 31 rotates, the third gear 35 rotates but the transmission shaft 34 does not rotate, and when the motor 21 rotates reversely, the second gear 32 rotates but the selection screw 31 does not rotate, the third gear 35 rotates and the transmission shaft 34 rotates.

[0055] In a preferred implementation manner of this embodiment, the cross sections of the inner holes of the transmission shaft 34 and the fourth gear 36 are both irregular shapes.

[0056] The fourth gear 36 has a free end that slides axially along the transmission shaft 34, but the fourth gear 36 cannot rotate circumferentially around the transmission shaft 34. Therefore, when the transmission shaft 34 rotates, the fourth gear 36 will be driven to rotate, and the transmission shaft 34 can also guide the linear motion of the fourth gear 36.

[0057] In a preferred implementation manner of this embodiment, all of the sixth gears 43 and the seventh gears 44 of the second motion unit 4 are connected to the same support shaft 46 .

[0058] Since the sixth gears 43 and the seventh gears 44 are in greater number and are located on the same straight line, connecting the sixth gears 43 and the seventh gears 44 to the same support shaft 46 not only makes the structure simpler, but also makes installation faster and easier.

[0059] In the preferred implementation manner of the present embodiment, the bracket includes a support plate 13, the support plate 13 is arranged inside the frame 11 and connected to the frame edge, the support plate 13 extends along the Y-axis direction, and the support plate 13 has a plurality of grooves arranged in sequence along the Y-axis direction, the groove openings of the grooves face the transmission shaft 34, and the plurality of adjusting screws 41 respectively pass through the bottoms of the plurality of grooves, the fifth gear 42, the sixth gear 43 and the seventh gear 44 are arranged in the grooves, the fifth gear 42 is close to the bottom of the groove, and the sixth gear 43 and the seventh gear 44 are respectively close to the two groove walls of the groove.

[0060] The plurality of grooves is equivalent to limiting the position of each positioning component, so that each positioning component can be installed at a required position during installation.

[0061] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention of the utility model.

Claims

1. A low-profile base station antenna transmission device, characterized in that: include: A support, the support comprising a frame; A driving unit, the driving unit comprising a motor and a first gear, wherein the first gear is connected to a power output shaft of the motor; A first motion unit, the first motion unit includes a positioning assembly and a transmission assembly arranged in sequence along the X-axis direction, the positioning assembly includes a positioning screw, a second gear and a positioning nut, the positioning screw extends along the Y-axis direction and is rotatably connected to the frame around the Y-axis direction, the second gear is connected to the positioning screw, the second gear and the first gear are mutually transmitted, the positioning screw rotates unidirectionally with the forward rotating motor, the positioning nut is connected to the positioning screw, and the positioning nut performs linear reciprocating motion along the Y-axis direction with the unidirectional rotating positioning screw, the transmission assembly includes a transmission shaft, a third gear and a fourth gear, the transmission shaft extends along the Y-axis direction, the third gear is connected to the transmission shaft, the third gear and the first gear are mutually transmitted, the transmission shaft rotates unidirectionally with the reversed motor, the fourth gear is connected to the transmission shaft and the positioning nut, the fourth gear can rotate around the Y-axis direction with the transmission shaft and can reciprocate linearly along the Y-axis direction with the positioning nut, and the fourth gear includes a spur gear portion; A second motion unit, the second motion unit includes a plurality of adjustment components arranged in sequence along the Y-axis direction, each of the adjustment components includes an adjustment screw, a fifth gear, a sixth gear, a seventh gear and an adjustment nut, the adjustment screw extends along the X-axis direction and is rotatably connected to the frame around the X-axis direction, the fifth gear is connected to the adjustment screw, the fifth gear has a bevel gear portion, the sixth gear is rotatably connected to the frame around the Y-axis direction and is located on one side of the fifth gear in the Y-axis direction, the sixth gear has a bevel gear portion and a spur gear portion, the bevel gear portion of the sixth gear is meshed with the bevel gear portion of the fifth gear, the seventh gear is rotatably connected to the frame around the Y-axis direction and is located on the other side of the fifth gear in the Y-axis direction, the seventh gear has a bevel gear portion and a spur gear portion, the bevel gear portion of the seventh gear is meshed with the bevel gear portion of the fifth gear; The frame surface surrounded by the frame is perpendicular to the Z-axis direction, the central axis of the motor, the central axis of the positioning screw, the central axis of the transmission shaft, and the central axis of the positioning screw are located in the same plane, the positioning screw is arranged on one side of the transmission shaft in the X-axis direction, and the positioning screw is arranged on the other side of the transmission shaft in the X-axis direction; When the fourth gear moves linearly, it switches to transmit the sixth gear and the seventh gear. When the fourth gear is meshed with the sixth gear, the spur gear part of the fourth gear and the spur gear part of the sixth gear are meshed with each other and drive the adjusting screw to rotate forward. When the fourth gear is meshed with the seventh gear, the spur gear part of the fourth gear and the spur gear part of the seventh gear are meshed with each other and drive the adjusting screw to rotate reversely.

2. The low-profile base station antenna transmission device according to claim 1, characterized in that: The power output shaft of the motor extends along the X-axis direction, the first gear and the third gear are transitionally connected through the eighth gear, the eighth gear is rotatably connected to the frame around the Y-axis direction, the second gear and the eighth gear are respectively arranged on both sides of the Y-axis direction of the first gear, and the third gear is arranged on one side of the X-axis direction of the eighth gear, the first gear includes a bevel gear portion, the second gear includes a bevel gear portion, the third gear includes a cylindrical gear portion, and the eighth gear includes a fan gear portion and a cylindrical gear portion, the bevel gear portion of the first gear is respectively meshed with the bevel gear portion of the second gear and the bevel gear portion of the eighth gear, and the cylindrical gear portion of the third gear is meshed with the cylindrical gear portion of the eighth gear.

3. The low-profile base station antenna transmission device according to claim 2, characterized in that: The bracket also includes a U-shaped piece, which is arranged inside the frame and connected to the edge of the frame. The U-shaped piece has a groove, and the notch of the groove faces the transmission shaft. The first gear, the second gear and the eighth gear are all arranged in the groove, the first gear is close to the bottom of the groove, and the second gear and the eighth gear are respectively close to the two groove walls of the groove.

4. The low-profile base station antenna transmission device according to claim 1, characterized in that: The motor is installed outside the frame.

5. The low-profile base station antenna transmission device according to claim 1, characterized in that: The positioning screw is processed with a forward spiral groove and a reverse spiral groove, the forward spiral groove and the reverse spiral groove are staggered and connected at both ends to form a bidirectional groove, the positioning nut includes a positioning drive block and a positioning drive sleeve, the positioning drive block is arranged in the bidirectional groove, the positioning drive sleeve is arranged on the outside of the positioning screw and limits the positioning drive block in the bidirectional groove, the positioning drive sleeve is connected to the fourth gear and the positioning drive sleeve and the fourth gear can rotate relative to each other around the Y-axis direction.

6. The low-profile base station antenna transmission device according to claim 5, characterized in that: The position selection drive sleeve has a connecting plate, the connecting plate is provided with a hinge hole, the fourth gear is provided with a connecting shaft, and the connecting shaft is connected to the hinge hole of the connecting plate.

7. The low-profile base station antenna transmission device according to claim 1, characterized in that: The positioning screw has a gear support portion, the second gear is connected to the gear support portion of the positioning screw, the second gear drives the positioning screw to rotate through a ratchet, the transmission shaft has a gear support portion, the third gear is connected to the gear support portion of the transmission shaft, and the third gear drives the transmission shaft to rotate through a ratchet.

8. The low-profile base station antenna transmission device according to claim 1, characterized in that: The cross sections of the inner holes of the transmission shaft and the fourth gear are both irregular shapes.

9. The low-profile base station antenna transmission device according to claim 1, characterized in that: All of the sixth gears and the seventh gears of the second moving unit are connected to the same supporting shaft.

10. The low-profile base station antenna transmission device according to claim 1, characterized in that: The bracket also includes a support plate, which is arranged inside the frame and connected to the frame edge, and the support plate extends along the Y-axis direction. The support plate has a plurality of grooves arranged in sequence along the Y-axis direction, and the groove openings of the grooves face the transmission shaft. A plurality of adjusting screws pass through the bottoms of the plurality of grooves respectively, and the fifth gear, the sixth gear and the seventh gear are arranged in the grooves, the fifth gear is close to the bottom of the groove, and the sixth gear and the seventh gear are close to the two groove walls of the groove respectively.

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