Coarse tracking two-dimensional turntable of ground laser communication terminal

Abstract

The invention relates to a coarse tracking two-dimensional rotary table of a ground laser communication terminal, and relates to the technical field of laser communication, the coarse tracking two-dimensional rotary table comprises a first rotary table and a second rotary table, the first rotary table comprises a first rotary table shell, the second rotary table comprises a second rotary table shell, and worm wheels are rotatably arranged in the first rotary table shell and the second rotary table shell; and fixing plates are arranged at the upper ends of the two worm wheels through bolts. In the using process, a plurality of first bolts and a plurality of second bolts are unscrewed, so that the sliding plate and the second rotary table can slide on the surface of the mounting plate, and therefore the gravity center position of the whole device can be adjusted; when the center of gravity shifts seriously, the center of gravity can be further adjusted by adjusting the balancing weight, so that the problem that the center of gravity shifts during operation, so that eccentric torque is generated in the operation process, and the load of the motor is increased is solved.

Description

Technical Field

[0001] This invention relates to the field of laser communication, and in particular to a coarse tracking two-dimensional turntable for terrestrial laser communication terminals. Background Technology

[0002] In the satellite laser communication technology system, the ground laser communication terminal is the core ground equipment for realizing the integrated space-ground optical signal transmission. One of its core functions is to capture and initially point the optical signal of space targets (such as satellites and high-altitude platforms) through a coarse tracking two-dimensional turntable, and then, in conjunction with a fine tracking mechanism, achieve high-precision beam alignment, ultimately ensuring the stable establishment of the laser communication link and data transmission.

[0003] In the existing technology, the mounting interface between the pitch axis and the optical components of the coarse tracking 2D turntable mostly adopts a fixed rigid structure without optimization design for the load center of gravity. When the optical components are installed and added to the pitch axis, a significant center of gravity offset will be generated on the azimuth axis, resulting in an eccentric torque. This causes the turntable drive motor to have to overcome the eccentric load during use, which in turn increases the motor load. Summary of the Invention

[0004] 1. Technical problems to be solved The purpose of this application is to provide a coarse tracking two-dimensional turntable for terrestrial laser communication terminals, in order to solve the problem that in the prior art, the pitch axis and the mounting interface of the optical components of the coarse tracking two-dimensional turntable mostly adopt a fixed rigid structure, without optimized design for the load center of gravity. When the optical components are installed and added to the pitch axis, a significant center of gravity offset will be generated on the azimuth axis, thereby forming an eccentric torque. This leads to the turntable drive motor having to overcome the eccentric load during use, resulting in an increased motor load.

[0005] The coarse tracking two-dimensional turntable of the ground laser communication terminal provided in this application adopts the following technical solution: it includes a first turntable and a second turntable. The first turntable includes a first turntable shell, and the second turntable includes a second turntable shell. Worm gears are rotatably arranged inside both the first turntable shell and the second turntable shell. Fixing plates are bolted to the upper ends of both worm gears. A connecting piece is bolted to the upper end of the fixing plate inside the first turntable shell, and a connecting frame is bolted to the upper end of the fixing plate inside the second turntable shell. One end of the connector is fixedly provided with a mounting plate. The mounting plate has two first sliding grooves in the middle. A sliding plate is slidably provided at the upper end of the two first sliding grooves. Two nuts are slidably provided at the lower end of the two first sliding grooves. Two first bolts are provided at the positions corresponding to the two first sliding grooves inside the sliding plate. The lower end of the first bolts passes through the sliding plate and extends into the first sliding groove and is threadedly connected to the nuts. Second sliding grooves are provided on both sides of the mounting plate. Two second bolts are slidably provided in the two second sliding grooves. One end of each of the four second bolts passes through the second sliding groove and is threadedly connected to the second turntable housing. By adopting the above technical solution, loosening multiple first bolts and multiple second bolts during use allows the sliding plate and the second turntable to slide on the surface of the mounting plate, thereby adjusting the center of gravity of the entire device. At the same time, a counterweight is installed at the lower end of one side of the connecting piece via bolts. When the center of gravity shifts significantly, the center of gravity can be further adjusted by adjusting the counterweight, thus avoiding the problem of center of gravity offset during operation, which would lead to eccentric torque and increased motor load.

[0006] Preferably, a fixing frame is bolted to the surface of the first turntable housing, and a first threaded rod is threaded at the middle of the upper end of the fixing frame. One end of the first threaded rod is rotatably connected to a first support block, and the end of the first threaded rod away from the first support block is fixedly connected to a first knob. By adopting the above technical solution, when using the first knob, rotating it will drive the first threaded rod to rotate synchronously, and then the first threaded rod will move, thereby driving the first support block and the first rubber limit block to move.

[0007] Preferably, a first rubber limiting block corresponding to the connector is fixedly provided on the surface of the first support block, and guide rods are slidably provided on both sides of the upper end of the fixing frame. One end of each of the two guide rods passes through the fixing frame and is fixedly connected to the first support block, and a limiting plate is fixedly provided at the end of each of the two guide rods away from the first support block. By adopting the above technical solution, rotating the first knob with the clock hand will drive the first threaded rod to rotate synchronously. Since the first threaded rod is threadedly connected to the fixed frame, the threaded rod will move relative to the fixed frame while rotating. When the first threaded rod shaft moves, it will drive the first support block to move synchronously.

[0008] Preferably, a first rubber limiting block corresponding to the connector is fixedly provided on the surface of the first support block, and guide rods are slidably provided on both sides of the upper end of the fixing frame. One end of each of the two guide rods passes through the fixing frame and is fixedly connected to the first support block, and a limiting plate is fixedly provided at the end of each of the two guide rods away from the first support block. By adopting the above technical solution, the first rubber limiting block is made of rubber. When the connecting piece approaches the first support block, it first contacts the first rubber limiting block, which can reduce the impact force of the collision and prevent damage to the entire device due to repeated collisions over a long period of time.

[0009] Preferably, a mounting bracket is bolted to the surface of the second turntable housing. A second threaded rod is threaded inside both sides of the mounting bracket. A second support block is fixedly installed at one end of each of the two second threaded rods that extends into the mounting bracket. A second knob is fixedly installed at one end of each of the two second threaded rods that is away from the second support block. By adopting the above technical solution, rotating the two second knobs during use will cause the two second threaded rods to rotate synchronously, thereby causing the two second threaded rods to move, which in turn causes the two second support blocks to move towards or away from each other.

[0010] Preferably, each of the two second support blocks has a second rubber limiting block fixedly disposed on its surface, corresponding to the connecting frame, and one end of the connecting frame is located between the two second rubber limiting blocks; By adopting the above technical solution, the second rubber limiting block can limit the maximum rotation angle of the connecting frame, and at the same time, the second rubber limiting block can reduce the impact force generated by collision during the limiting process.

[0011] Preferably, two counterweights are bolted to the lower end of one side of the connector; By adopting the above technical solution, the center of gravity can be adjusted by adding or removing counterweights during use.

[0012] Preferably, a first worm gear mounting seat is fixedly provided on one side inside the first turntable housing and the second turntable housing, and a second worm gear mounting seat is fixedly provided on the side inside the first turntable housing and the second turntable housing away from the first worm gear mounting seat. A worm is rotatably provided between the first worm gear mounting seat and the second worm gear mounting seat. The worm is connected to the motor shaft through a coupling, and the worm meshes with a worm wheel. By adopting the above technical solution, when the motor is started, the rotation of the internal rotating shaft of the motor will drive the worm gear to rotate through the coupling, and at the same time drive the worm wheel to rotate.

[0013] 2. Beneficial effects In summary, this application includes at least one of the following beneficial technical effects: 1. This invention provides a coarse tracking two-dimensional turntable for a terrestrial laser communication terminal. A fixed frame is provided on the surface of the first turntable shell. A first support block is provided on the upper end of the fixed frame via a first threaded rod. A first rubber limiting block corresponding to a connecting member is fixedly provided on the surface of the first support block. During use, rotating a first knob at one end of the first threaded rod controls the rotation of the first threaded rod, thereby causing the threaded rod to push the first support block and the first rubber limiting block to move, thus changing the distance between the first rubber limiting block and the connecting member, and thus changing the maximum rotation angle of the connecting member. Simultaneously, a mounting frame is provided on the surface of the second turntable shell. Second threaded rods are threadedly connected to the interior of both sides of the mounting frame. A second support block is provided at one end of each of the two second threaded rods. The second support block is equipped with a second rubber limit block on its surface. One end of the connecting frame is located between the two second rubber limit blocks. During use, rotating the second knob on the two second threaded rods will rotate the second threaded rods, which in turn will move the second support block and the second rubber limit block, thereby changing the distance between the two second rubber limit blocks. This allows for changing the maximum rotation angle of the connecting frame, making it suitable for coarse tracking angle requirements in different scenarios without replacing the limit blocks. Furthermore, both the first and second rubber limit blocks are made of rubber, which reduces the impact force between the limit blocks and the connecting parts and the connecting frame when limiting their movement, thus preventing damage during prolonged use and extending service life.

[0014] 2. This invention provides a coarse tracking two-dimensional turntable for a terrestrial laser communication terminal. A mounting plate is provided on one side of the connector. Two first sliding grooves are formed in the middle of the mounting plate. A sliding plate is slidably mounted on the upper end of both first sliding grooves. Two nuts are slidably mounted on the lower end of each of the two first sliding grooves. Four first bolts are slidably mounted inside the sliding plate, with one end of each bolt threadedly connected to a nut. Simultaneously, second sliding grooves are formed on both sides of the mounting plate. Second bolts are installed inside each of the two second sliding grooves, passing through the second sliding grooves and the sliding plate, and threadedly connected to the outer shell of the second turntable. During use, loosening multiple first and second bolts allows the sliding plate and the second turntable to slide on the surface of the mounting plate, thereby adjusting the center of gravity of the entire device. A counterweight is bolted to the lower end of one side of the connector. When the center of gravity shifts significantly, adjusting the counterweight further adjusts the center of gravity, thus preventing center of gravity misalignment during operation, which could lead to eccentric torque and increased motor load. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the counterweight installation structure of the present invention; Figure 3 This is a schematic diagram of the motor mounting structure of the present invention; Figure 4 This is a schematic diagram of the mounting plate installation structure of the present invention; Figure 5 This is a schematic diagram of the meshing relationship between the turbine and the worm gear in this invention; Figure 6 for Figure 1 Enlarged view of the structure at point A in the middle; Figure 7 for Figure 1 Enlarged view of the structure at point B in the middle; Figure 8 for Figure 3 Enlarged view of the structure at point C.

[0016] The components include: 1. First turntable; 101. First turntable housing; 102. Fixing frame; 103. First threaded rod; 104. First knob; 105. First support block; 106. First rubber limiting block; 107. Guide rod; 108. Limiting plate; 109. Connecting piece; 110. Counterweight block; 111. Mounting plate; 112. First slide groove; 113. Sliding plate; 114. First bolt; 115. Nut; 116. Second slide groove; 117. Second bolt. 1. Second turntable; 201. Second turntable housing; 202. Mounting bracket; 203. Second threaded rod; 204. Second support block; 205. Second rubber limit block; 206. Second knob; 207. Connecting bracket; 3. Worm gear; 4. Fixing plate; 5. First worm mounting base; 6. Second worm mounting base; 7. Worm; 8. Motor mounting base; 9. Motor. Detailed Implementation

[0017] The following is in conjunction with the appendix Figure 1 - Appendix Figure 8 This application will be described in further detail below.

[0018] Example 1: A coarse tracking two-dimensional turntable for a terrestrial laser communication terminal, comprising a first turntable 1 and a second turntable 2. The first turntable 1 includes a first turntable housing 101, and the second turntable 2 includes a second turntable housing 201. Worm gears 3 are rotatably mounted inside both the first turntable housing 101 and the second turntable housing 201. Fixing plates 4 are bolted to the upper ends of both worm gears 3. A connector 109 is bolted to the upper end of the fixing plate 4 located inside the first turntable housing 101, and a connecting piece 109 is bolted to the upper end of the fixing plate 4 located inside the second turntable housing 201. The frame 207 has a first worm gear mounting seat 5 fixedly installed on one side inside the first turntable housing 101 and the second turntable housing 201. A second worm gear mounting seat 6 is fixedly installed on the side inside the first turntable housing 101 and the second turntable housing 201 away from the first worm gear mounting seat 5. A worm 7 is rotatably installed between the first worm gear mounting seat 5 and the second worm gear mounting seat 6. The worm 7 is connected to the rotating shaft of the motor 9 through a coupling. The worm 7 meshes with the worm wheel 3. When the motor 9 is started, the rotating shaft inside the motor 9 will rotate and drive the worm 7 to rotate through the coupling, and at the same time drive the worm wheel 3 to rotate. One end of the connector 109 is fixedly provided with a mounting plate 111. Two first sliding grooves 112 are opened in the middle of the mounting plate 111. A sliding plate 113 is slidably provided in the upper end of the two first sliding grooves 112. Two nuts 115 are slidably provided in the lower end of the two first sliding grooves 112. Two first bolts 114 are provided in the sliding plate 113 at positions corresponding to the two first sliding grooves 112. The lower end of the first bolts 114 passes through the sliding plate 113 and extends into the first sliding groove 112 and is threadedly connected to the nuts 115. Second sliding grooves 116 are opened in the interior of both sides of the mounting plate 111. Two second bolts 117 are slidably provided in the interior of the two second sliding grooves 116. One end of each of the four second bolts 117 passes through the second sliding groove 116 and is threadedly connected to the second turntable housing 201. A fixing frame 102 is bolted to the surface of the first turntable housing 101. A first threaded rod 103 is threaded onto the middle of the upper end of the fixing frame 102. One end of the first threaded rod 103 is rotatably connected to a first support block 105. A first knob 104 is fixedly connected to the end of the first threaded rod 103 away from the first support block 105. In use, rotating the first knob 104 will cause the first threaded rod 103 to rotate synchronously. Then, the first threaded rod 103 will move, thereby causing the first support block 105 and the first rubber limit block 106 to move. The surface of the first support block 105 is fixedly provided with a first rubber limit block 106 corresponding to the connector 109. Guide rods 107 are slidably provided on both sides of the upper end of the fixing frame 102. One end of each guide rod 107 passes through the fixing frame 102 and is fixedly connected to the first support block 105. A limit plate 108 is fixedly provided at the end of each guide rod 107 away from the first support block 105. In use, rotating the first knob... 104 will drive the first threaded rod 103 to rotate synchronously. Since the first threaded rod 103 is threadedly connected to the fixed frame 102, the threaded rod 103 will move relative to the fixed frame 102 while rotating. When the first threaded rod 103 moves, it will drive the first support block 105 to move synchronously. The surface of the first support block 105 is fixedly provided with a first rubber limiting block 106 corresponding to the connector 109. Guide rods 107 are slidably provided on both sides of the upper end of the fixed frame 102. One end of each guide rod 107 passes through the fixed frame 102 and is fixedly connected to the first support block 105. The end of each guide rod 107 away from the first support block 105 is fixedly provided with a limiting plate 108. The first rubber limiting block 106 is made of rubber. When the connector 109 approaches the first support block 105, it will first contact the first rubber limiting block 106, thereby reducing the impact force of the collision and preventing damage to the entire device due to repeated collisions over a long period of time. A mounting bracket 202 is bolted to the surface of the second turntable housing 201. Two threaded rods 203 are threaded onto the interior of both sides of the mounting bracket 202. A second support block 204 is fixedly mounted at one end of each threaded rod 203 that extends into the mounting bracket 202. A second knob 206 is fixedly mounted at the end of each threaded rod 203 away from the second support block 204. In use, rotating the two second knobs 206 will cause the two threaded rods 203 to rotate synchronously, thereby moving the two threaded rods 203 and causing the two second support blocks 204 to move towards each other. Alternatively, the movement can be reversed. Each of the two second support blocks 204 has a second rubber limiting block 205 fixedly installed on its surface, corresponding to the connecting frame 207. One end of the connecting frame 207 is located between the two second rubber limiting blocks 205. The second rubber limiting blocks 205 can limit the maximum rotation angle of the connecting frame 207. At the same time, the second rubber limiting blocks 205 can reduce the impact force generated by collision during the limiting process. The lower end of one side of the connecting piece 109 is connected to two counterweights 110 by bolts. During use, the center of gravity can be adjusted by adding or removing the counterweights 110.

[0019] In this embodiment: a fixing frame 102 is provided on the surface of the first turntable shell 101 of the first turntable 1. A first support block 105 is provided on the upper end of the fixing frame 102 via a first threaded rod 103. A first rubber limiting block 106 corresponding to the connector 109 is fixedly provided on the surface of the first support block 105. During use, by rotating the first knob 104 at one end of the first threaded rod 103, the first threaded rod 103 is controlled to rotate, thereby causing the first threaded rod 103 to push the first support block 105 and the first rubber limiting block 106 to move, thereby changing the distance between the first rubber limiting block 106 and the connector 109, and ultimately changing the maximum rotation angle of the connector 109. At the same time, a mounting frame 202 is provided on the surface of the second turntable shell 201 of the second turntable 2. A second threaded rod 203 is threadedly connected to both sides of the mounting frame 202. A second support block 2 is provided at one end of each of the two second threaded rods 203. 04. Two second rubber limiting blocks 205 are provided on the surfaces of both second support blocks 204, and one end of the connecting frame 207 is located between the two second rubber limiting blocks 205. During use, by rotating the second knobs 206 on the two second threaded rods 203, the second threaded rods 203 will rotate, thereby causing the second support block 204 and the second rubber limiting blocks 205 to move, thus changing the distance between the two second rubber limiting blocks 205. Ultimately, this changes the maximum rotation angle of the connecting frame 207. This eliminates the need to replace the limiting blocks, making it suitable for coarse tracking angle requirements in different scenarios. Furthermore, both the first rubber limiting block 106 and the second rubber limiting block 205 are made of rubber. When limiting the connection piece 109 and the connecting frame 207, this reduces the impact force between the limiting blocks and the connection piece 109 and the connecting frame 207, preventing damage over long-term use and thus improving the equipment's service life. A mounting plate 111 is provided on one side of the connector 109. Two first sliding grooves 112 are opened in the middle of the mounting plate 111. A sliding plate 113 is slidably arranged at the upper end of the two first sliding grooves 112. Two nuts 115 are slidably arranged at the lower end of the two first sliding grooves 112. Four first bolts 114 are slidably arranged inside the sliding plate 113. One end of the first bolt 114 is threadedly connected to the nut 115. At the same time, second sliding grooves 116 are provided on both sides of the mounting plate 111. A second bolt 117 is arranged inside the two second sliding grooves 116. The second bolt 117 passes through the second sliding groove 116 and the sliding plate 113 and is threadedly connected to the second turntable housing 201. During use, loosening multiple first bolts 114 and multiple second bolts 117 allows the sliding plate 113 and the second turntable 2 to slide on the surface of the mounting plate 111, thereby adjusting the center of gravity of the entire device. At the same time, a counterweight 110 is bolted to the lower end of one side of the connector 109. When the center of gravity is significantly offset, the center of gravity can be further adjusted by adjusting the counterweight 110, thereby avoiding the problem of center of gravity offset during operation, which would lead to eccentric torque and increased load on the motor 9.

[0020] The implementation principle of this application embodiment is as follows: In use, according to the requirements of the coarse tracking task, rotate the first knob 104. The first knob drives the first threaded rod 103 to rotate synchronously. Because the first threaded rod is threadedly engaged with the fixed frame 102, the first threaded rod 103 will move, thereby driving the first support block 105 and the first rubber limit block 106 to move synchronously. During the movement, keep the connecting piece 109 in close contact with the first rubber limit block 106 and measure the angle with an angle gauge at the same time. When the connecting piece 109 rotates to the appropriate angle, stop rotating the first knob 104. Then rotate the second knob 206. The second knob 206 drives the second threaded rod 203 to move, thereby pushing the second support block 204 and the second rubber limit block 205 to move. When the second rubber limit block 205 moves, keep the connecting frame 207 in close contact with the surface of the second rubber limit block 205 and measure with an angle gauge until the connecting frame 207 is adjusted to the appropriate range in both the positive and negative directions. When adjusting the center of gravity offset, first loosen the four first bolts 114 until the sliding plate 113 can slide freely along the first slide groove 112 and the nut 115 does not disengage from the first slide groove 112. Then, simultaneously loosen the four second bolts 117 until the second turntable housing 201 can move synchronously with the sliding plate 113. Then, place the level on the upper surface of the second turntable housing 201 and observe the bubble position. If the bubble is biased to the left, push the sliding plate 113 to the right with both hands and observe the bubble on the level until the bubble is centered. If the bubble is biased to the right, push the sliding plate 113 to the left until the bubble is centered. Then, tighten all the first bolts 114 and second bolts 117. When the position of the sliding plate 113 moves to both ends of the first slide groove 112, the center of gravity still shifts. At this time, the counterweight 110 can be added or removed to further adjust the center of gravity.

Claims

1. Coarse tracking two-dimensional turntable of a ground laser communication terminal, comprising a first turntable (1) and a second turntable (2), characterized in that: The first rotating platform (1) comprises a first rotating platform shell (101), the second rotating platform (2) comprises a second rotating platform shell (201), the first rotating platform shell (101) and the second rotating platform shell (201) are internally rotatably provided with worm gears (3), the upper ends of the two worm gears (3) are provided with fixed plates (4) through bolts, the upper end of the fixed plate (4) in the first rotating platform shell (101) is provided with a connecting piece (109) through a bolt, and the upper end of the fixed plate (4) in the second rotating platform shell (201) is provided with a connecting frame (207) through a bolt. One end of the connecting piece (109) is fixedly provided with a mounting plate (111), the mounting plate (111) is provided with two first sliding grooves (112) in the middle, the upper ends of the two first sliding grooves (112) are slidably provided with a sliding plate (113), the lower ends of the two first sliding grooves (112) are slidably provided with two nuts (115), the first sliding grooves (112) are provided with two first bolts (114) at positions corresponding to the two first sliding grooves (112) in the sliding plate (113), the lower ends of the first bolts (114) penetrate the sliding plate (113) and extend into the first sliding grooves (112) and are in threaded connection with the nuts (115), the second sliding grooves (116) are formed in the inner sides of the mounting plate (111), the second sliding grooves (116) are slidably provided with two second bolts (117), and the first ends of the four second bolts (117) penetrate the second sliding grooves (116) and are in threaded connection with the second rotating platform shell (201).

2. A coarse tracking two-dimensional turntable for a ground laser communication terminal according to claim 1, characterized in that: The first rotating platform shell (101) is provided with a fixing frame (102) on the surface through a bolt, the first threaded rod (103) is threadedly arranged on the upper end of the fixing frame (102), the first threaded rod (103) is rotatably connected with the first supporting block (105) at one end, and the first threaded rod (103) is fixedly connected with the first knob (104) at the end away from the first supporting block (105).

3. A coarse tracking two-dimensional turntable for a ground laser communication terminal according to claim 2, characterized in that: The first supporting block (105) is fixedly provided with a first rubber limiting block (106) corresponding to the connecting piece (109) on the surface, the upper end of the fixing frame (102) is slidably provided with a guide rod (107) on each side, the guide rods (107) penetrate the fixing frame (102) and are fixedly connected with the first supporting block (105) at one end, and the guide rods (107) are fixedly provided with a limiting plate (108) at the ends away from the first supporting block (105).

4. The coarse tracking two-dimensional turntable of a ground laser communication terminal according to claim 1, characterized in that: The second rotating platform shell (201) is provided with a mounting frame (202) on the surface through a bolt, the second threaded rods (203) are threadedly arranged in the inner sides of the mounting frame (202), the second threaded rods (203) are fixedly provided with second supporting blocks (204) at the ends penetrating the mounting frame (202), and the second threaded rods (203) are fixedly provided with second knobs (206) at the ends away from the second supporting blocks (204).

5. A coarse tracking two-dimensional turntable for a ground laser communication terminal according to claim 4, characterized in that: The surfaces of the two second support blocks (204) are each fixedly provided with a second rubber limiting block (205) corresponding to the connecting frame (207), and one end of the connecting frame (207) is located between the two second rubber limiting blocks (205).

6. The coarse tracking two-dimensional turntable of a ground laser communication terminal according to claim 1, characterized in that: The lower end of one side of the connector (109) is connected to two counterweights (110) by bolts.

7. The coarse tracking two-dimensional turntable of a ground laser communication terminal according to claim 1, characterized in that: Both the first turntable housing (101) and the second turntable housing (201) are bolted with motor mounting seats (8), and a motor (9) is bolted to one end of each of the two motor mounting seats (8).

8. A coarse tracking two-dimensional turntable for a ground laser communication terminal according to claim 7, characterized in that: A first worm gear mounting seat (5) is fixedly provided on one side inside the first turntable housing (101) and the second turntable housing (201). A second worm gear mounting seat (6) is fixedly provided on the side inside the first turntable housing (101) and the second turntable housing (201) away from the first worm gear mounting seat (5). A worm (7) is rotatably provided between the first worm gear mounting seat (5) and the second worm gear mounting seat (6). The worm (7) is connected to the motor (9) shaft through a coupling. The worm (7) meshes with the worm wheel (3).

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