Fish school counting device based on unmanned aerial vehicle

Abstract

The invention belongs to the field of fish school monitoring, and particularly relates to a fish school counting device based on an unmanned aerial vehicle, which comprises a first connecting seat connected with an unmanned aerial vehicle body, a second connecting seat is connected below the first connecting seat, the first connecting seat and the second connecting seat are both of a disc structure, and a pay-off mechanism is jointly arranged between the first connecting seat and the second connecting seat. A mounting opening is formed in the lower side of the second connecting base, and a fish school counting instrument is arranged in the mounting opening. A front guide groove is formed in the lower side of the first connecting base, a front guide base matched with the front guide groove is fixedly arranged on the upper side of the second connecting base, an annular movable groove is formed in the position, located on the edge of a lower port of the front guide groove, of the lower side of the first connecting base, and a limiting groove extending in the circumferential direction of the movable groove is formed in the inner wall, close to the upper side, of the movable groove. According to the invention, the fish school counting instrument can be close to the fish school as much as possible, and the accuracy of fish school monitoring and counting is further improved on the premise of not disturbing the fish school.

Description

Technical Field

[0001] The invention belongs to the field of fish school monitoring, and in particular relates to a fish school counting device based on an unmanned aerial vehicle. Background Art

[0002] Changes in the number of fish can be used as an important indicator of the quality of aquatic ecological environment. Changes in environmental factors such as water pollution and habitat destruction will directly affect the number of fish. Counting the number of fish can help scientists study the dynamic changes of fish populations. By monitoring the number of fish over a long period of time, scientists can understand important information such as the reproduction patterns, mortality rates, and migration patterns of fish.

[0003] At present, drone fish counting is a method that combines modern aviation technology and image processing technology. By combining the counting device with the drone, the convenience of the drone can be used to monitor the fish at high altitude at any time. This method has important application value in the fields of fishery resource management, environmental protection and scientific research.

[0004] However, the existing drone-based fish counting devices still have the following defects in actual use: although the drone can carry the fish counting device to shoot and record the fish school from a high altitude, the drone has a certain amount of noise when working. In particular, in order to be able to stably carry the fish counting device, the drone used is generally large in size and power. The drone needs to be at a very high span above the water surface to ensure that the noise will not affect the fish school on the water surface. This makes the distance between the fish counting device and the fish school on the water surface relatively large, which greatly affects the clarity of the fish counting device's shooting of the fish school, thereby further affecting the subsequent analysis and processing based on the fish school shooting picture, thereby affecting the counting accuracy of the fish school. Summary of the invention

[0005] In view of the above problems, the drone-based fish counting device provided in the embodiment of the present application can place the fish counter as close to the fish school as possible, thereby further improving the accuracy of fish school monitoring and counting without disturbing the fish school.

[0006] In order to achieve the above-mentioned purpose, the embodiment of the present application provides the following technical solutions: The present invention provides a fish counting device based on a drone, including a connection seat 1 connected to the drone body, a connection seat 2 connected to the bottom of the connection seat 1, the connection seat 1 and the connection seat 2 are both disc structures, a line release mechanism is commonly arranged between the connection seat 1 and the connection seat 2, a mounting opening is arranged on the bottom side of the connection seat 2, and a fish counter is arranged in the mounting opening. A front guide groove is arranged on the bottom side of the connection seat 1, a front guide seat adapted to the front guide groove is fixedly arranged on the top side of the connection seat 2, an annular movable groove is arranged on the edge of the lower port of the front guide groove on the bottom side of the connection seat 1, a limit groove extending along its circumferential direction is arranged on the inner wall of the movable groove close to the top side, two limit plates symmetrically arranged with the center of the connection seat 2 as the center are rotatably arranged on the top of the connection seat 2, and a driving mechanism is arranged inside the connection seat 2. The wire-releasing mechanism controls the second connecting seat to move toward the first connecting seat to control the front guide seat to be inserted into the front guide groove, and controls the limit plate inserted into the limit groove to rotate through the driving mechanism to lock the second connecting seat with the first connecting seat.

[0007] According to a favorable embodiment, a wire storage cavity is provided at an inner portion of the connecting seat 1 near the upper side, the wire releasing mechanism comprises a wire reel rotatably arranged in the wire storage cavity, a wire threading hole connected to the front guide groove is provided on the lower inner wall of the wire storage cavity, a guide member 1 is provided at an arbitrary position near the edge of the wire reel in the wire storage cavity, a guide member 2 is provided in the threading hole, and a traction rope is commonly connected between the wire reel, the guide member 1, the guide member 2 and the front guide seat.

[0008] According to a favorable embodiment, the guide member 1 includes two guide rollers 1, and the two guide rollers 1 are rotatably arranged on the front and rear inner walls of the threading hole and are symmetrical with the center of the connecting seat 1 as the center. The traction rope is movably arranged between the two guide rollers 1, and the guide member 2 includes two support plates fixedly arranged on the lower inner wall of the wire storage cavity and symmetrical front and back. Two guide rollers 2 distributed upper and lower are rotatably arranged between the two support plates, and the traction rope is slidably arranged between the upper and lower guide rollers 2.

[0009] According to a favorable embodiment, the wire-releasing mechanism further comprises a motor 1 fixedly arranged inside a connecting seat 1 and close to an upper position, and an output shaft of the motor 1 is fixedly connected to an upper side of the wire drum.

[0010] According to a favorable embodiment, a cavity is provided on the inner wall of the port close to the lower side of the installation opening, and two sealing plates are rotatably arranged in the cavity so as to be symmetrical with two centers of the connecting seat as the center.

[0011] According to a favorable embodiment, a driving cavity with a rectangular structure is opened at a position near the upper side of the interior of the connecting seat 2, and a driving plate sliding along its length direction is arranged in the driving cavity, and sliders are fixedly arranged on both shorter sides of the driving plate, and the sliders are slidably connected to the driving cavity, and a first transmission assembly is commonly arranged between the driving plate and the two limit plates and the two sealing plates, and a second transmission assembly is commonly arranged between the driving plate and the fish counter.

[0012] According to a favorable embodiment, a plurality of movable holes are provided on the surface of the driving plate along its length direction, the first transmission assembly includes a rack fixedly arranged on the inner wall at the rear side of the movable hole, a rotating shaft 1 rotatably arranged on the connecting seat 2 is fixedly arranged on the lower side of the limiting plate, the lower end of the rotating shaft 1 movably passes through the corresponding movable hole and is rotatably connected to the lower inner wall of the driving cavity, a first gear is fixedly arranged on the outer wall of the rotating shaft 1 located in the movable hole, and the first gear is meshed with the rack on the inner wall at the rear side of the corresponding movable hole.

[0013] According to a preferred embodiment, the first transmission assembly also includes a second rotating shaft fixedly connected to the sealing plate, the lower end of the second rotating shaft is rotatably connected to the lower inner wall of the cavity, and the upper end of the second rotating shaft movably passes through the corresponding movable hole and is rotatably connected to the upper inner wall of the driving cavity, the second rotating shaft is rotatably connected to the second connecting seat, the second rotating shaft is fixedly provided with a second gear on the outer wall of the movable hole, the second gear is meshed with a rack on the rear inner wall of the corresponding movable hole, a second motor is fixedly provided inside the leading guide seat, the output shaft of the leading guide seat is fixedly connected with a third gear rotatably provided in the corresponding movable hole, and the third gear is meshed with the rack on the rear inner wall of the corresponding movable hole.

[0014] According to a favorable embodiment, a sliding hole connected to the drive cavity is provided on the upper inner wall of the mounting opening, and the second drive assembly includes a sliding column fixedly connected to the upper side of the fish counter, the sliding column is slidably connected to the sliding hole, and balls are rotatably provided on the side walls around the sliding column, the balls are rollingly connected to the inner wall corresponding to the sliding hole, and a transmission plate is hinged on the upper side of the sliding column, and the side of the transmission plate away from the sliding column is hinged to the lower side of the drive plate.

[0015] According to a favorable embodiment, an annular counterweight cavity is provided inside the connecting seat 2 below the driving cavity and between the cavity, and an injection port connected to the counterweight cavity is provided on the upper side of the connecting seat 2, and a sealing plug is threadedly connected to the upper end of the injection port.

[0016] Compared with the prior art, the fish counting device based on drone provided by the embodiment of the present invention has the following beneficial effects:

[0017] 1. In the present invention, the connection seat 1 and the connection seat 2 can cooperate with the line-releasing mechanism, so that the fish school counter can be as close to the fish school as possible, and the accuracy of fish school monitoring and counting can be further improved without disturbing the fish school.

[0018] 2. In the present invention, the driving mechanism provided can cooperate with the limiting plate to lock the connecting seat 1 and the connecting seat 2, thereby further improving the stability of the two after connection.

[0019] 3. In the present invention, the driving mechanism can also control the fish counter to extend or retract into the installation opening as needed and simultaneously control the opening and closing of the installation opening through the sealing plate, which facilitates monitoring and protects the fish counter when it is idle.

[0020] 4. In the present invention, the second connecting seat is in the form of a disc structure as a whole, which can effectively reduce wind resistance, and is provided with a counterweight cavity inside, which can improve the wind resistance of the connecting seat, thereby further improving the stability of the fish counter during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is the external three-dimensional structure diagram of the present invention.

[0022] Figure 2 This is the external main view plan structure diagram of the present invention.

[0023] Figure 3 It is a main plane sectional view of the connecting seat 1 in the present invention.

[0024] Figure 4 It is a main plane sectional view of the connecting seat 2 in the present invention.

[0025] Figure 5 It is a planar cross-sectional view of the connection seat 1 and the connection seat 2 in the present invention after being connected.

[0026] Figure 6 It is an external three-dimensional structural diagram of the driving mechanism in the present invention.

[0027] The accompanying drawings are numerals in the figure: 1. connecting seat 1; 11. front guide groove; 12. movable groove; 13. limit groove; 14. line storage cavity; 2. connecting seat 2; 21. installation port; 22. cavity; 23. drive cavity; 24. counterweight cavity; 3. line release mechanism; 31. line drum; 32. guide member 1; 33. guide member 2; 34. traction rope; 35. motor 1; 4. fish school counter; 5. sealing plate; 6. front guide seat; 7. limit plate; 8. drive mechanism; 81. drive plate; 811. movable hole; 82. slider; 83. first transmission assembly; 831. rack; 832. rotating shaft 1; 833. first gear; 834. rotating shaft 2; 835. second gear; 836. motor 2; 837. third gear; 84. second transmission assembly; 841. slide column; 842. transmission plate. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-6 The present application is further described in detail.

[0029] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 A fish counting device based on a drone includes a connecting seat 1 connected to a drone body, a front guide groove 11 is provided on the lower side of the connecting seat 1, a connecting seat 2 2 is connected to the lower side of the connecting seat 1, a front guide seat 6 matched with the front guide groove 11 is fixedly provided on the upper side of the connecting seat 2 2, the connecting seat 1 and the connecting seat 2 2 are both disc structures, a line-releasing mechanism 3 is provided between the connecting seat 1 and the connecting seat 2 2, an installation opening 21 is provided on the lower side of the connecting seat 2 2, and a fish counter 4 is provided in the installation opening 21.

[0030] See also Figure 3 and Figure 5 A wire storage chamber 14 is provided inside the connecting seat 1 near the upper side, and the wire releasing mechanism 3 includes a wire drum 31 rotatably arranged in the wire storage chamber 14, and a threading hole connected to the front guide groove 11 is provided on the lower inner wall of the wire storage chamber 14, and a guide member 1 32 is provided at any position near the edge of the wire drum 31 inside the wire storage chamber 14, and a guide member 2 33 is provided in the threading hole, and a traction rope 34 is commonly connected between the wire drum 31, the guide member 1 32, the guide member 2 33 and the front guide seat 6.

[0031] See also Figure 3The guide member 1 32 includes two guide rollers 1, which are both rotatably arranged on the front and rear inner walls of the threading hole and are symmetrical with the center of the connecting seat 1 as the center. The traction rope 34 is movably arranged between the two guide rollers 1. The guide member 2 33 includes two support plates fixedly arranged on the lower inner wall of the wire storage cavity 14 and symmetrical in front and back. Two guide rollers 2 distributed up and down are rotatably arranged between the two support plates. The traction rope 34 is slidably arranged between the upper and lower guide rollers 2. The wire release mechanism 3 also includes a motor 1 35 fixedly arranged inside the connecting seat 1 and close to the upper side. The output shaft of the motor 1 35 is fixedly connected to the upper side of the wire drum 31.

[0032] During specific operation, under normal conditions, the front guide seat 6 on the upper side of the connecting seat 2 will be inserted into the front guide groove 11 on the lower side of the connecting seat 1, so that the connecting seat 1 and the connecting seat 2 fit together for easy transportation as a whole.

[0033] During the process of monitoring the number of fish, the whole is brought to a certain height above the monitored water area by an external drone, and then the motor 1 35 drives the wire drum 31 to rotate forward to release the line, and the traction rope 34 is stably released under the guidance of the guide rollers 1 and 2, so that the connecting seat 2 2 is separated from the bottom of the connecting seat 1 and gradually moves downward to the water surface. The releasing process is relatively quiet, and the connecting seat 2 2 with the fish school counter 4 can be stably moved to a position closer to the fish school, and then the counting work is performed by the fish school counter 4. After the counting is completed, the motor 1 35 drives the wire drum 31 to rotate in the opposite direction to reel in the line, and the traction rope 34 is controlled to pull the connecting seat 2 2 upward until the front guide seat 6 on the upper side of the connecting seat 2 2 is inserted into the front guide groove 11 on the lower side of the connecting seat 1 1. The front guide seat 6 cooperates with the front guide groove 11 to guide the connecting seat 1 1 to align and fit with the connecting seat 2 2.

[0034] See also Figure 3 , Figure 4 and Figure 5 A ring-shaped movable groove 12 is provided on the edge of the lower end of the front guide groove 11 at the lower side of the connecting seat 1, and a limiting groove 13 extending along its circumferential direction is provided on the inner wall of the movable groove 12 close to the upper side. Two limiting plates 7 symmetrically centered on the center of the connecting seat 2 2 are rotatably arranged above the connecting seat 2, and a driving mechanism 8 is arranged inside the connecting seat 2 2.

[0035] See also Figure 4 A cavity 22 is provided on the inner wall of the port near the lower side of the mounting opening 21, and two sealing plates 5 are rotatably arranged in the cavity 22 and are symmetrical with the center of the connecting seat 22 as the center.

[0036] See also Figure 4A driving cavity 23 with a rectangular structure is provided inside the connecting seat 2 near the upper side, and a driving plate 81 sliding along its length direction is provided in the driving cavity 23. Slide blocks 82 are fixedly provided on both shorter sides of the driving plate 81. The slide blocks 82 are slidably connected to the driving cavity 23. A first transmission assembly 83 is provided between the driving plate 81 and the two limit plates 7 and the two sealing plates 5, and a second transmission assembly 84 is provided between the driving plate 81 and the fish counter 4.

[0037] See also Figure 4 and Figure 6 A plurality of movable holes 811 are provided on the surface of the driving plate 81 along its length direction. The first transmission assembly 83 includes a rack 831 fixedly arranged on the inner wall at the rear side of the movable hole 811. A rotating shaft 832 rotatably arranged on the connecting seat 22 is fixedly arranged on the lower side of the limiting plate 7. The lower end of the rotating shaft 832 movably passes through the corresponding movable hole 811 and is rotatably connected to the lower inner wall of the driving chamber 23. A first gear 833 is fixedly arranged on the outer wall of the rotating shaft 832 located in the movable hole 811. The first gear 833 meshes with the rack 831 on the inner wall at the rear side of the corresponding movable hole 811.

[0038] See also Figure 4 , Figure 5 and Figure 6 The first transmission assembly 83 also includes a second rotating shaft 834 fixedly connected to the sealing plate 5, the lower end of the second rotating shaft 834 is rotatably connected to the lower inner wall of the cavity 22, and the upper end of the second rotating shaft 834 movably passes through the corresponding movable hole 811 and is rotatably connected to the upper inner wall of the driving chamber 23, the second rotating shaft 834 is rotatably connected to the connecting seat 22, and the second rotating shaft 834 is located on the outer wall of the movable hole 811 and is fixedly provided with a second gear 835, and the second gear 835 is meshed with the rack 831 on the inner wall of the rear side of the corresponding movable hole 811, and the front guide seat 6 is fixedly provided with a second motor 836, and the output shaft of the front guide seat 6 is fixedly connected with a third gear 837 rotatably provided in the corresponding movable hole 811, and the third gear 837 is meshed with the rack 831 on the inner wall of the rear side of the corresponding movable hole 811.

[0039] See also Figure 4 and Figure 6 A sliding hole connected to the driving chamber 23 is provided on the upper inner wall of the mounting opening 21. The second driving assembly includes a sliding column 841 fixedly connected to the upper side of the fish counter 4. The sliding column 841 is slidably connected to the sliding hole. Balls are rotatably arranged on the side walls around the sliding column 841. The balls are rollingly connected to the inner side walls corresponding to the sliding hole. A transmission plate 842 is hinged on the upper side of the sliding column 841. The side of the transmission plate 842 away from the sliding column 841 is hinged to the lower side of the driving plate 81.

[0040] During specific operation, when it is necessary to fix the connecting seat 1 and the connecting seat 2 together, after the connecting seat 1 and the connecting seat 2 are connected together by the traction rope 34, the limit plate 7 will be first inserted into the movable groove 12, and then the third gear 837 will be driven to rotate in the forward direction by the motor 2 836, and the driving plate 81 will be controlled to move under the cooperation of the corresponding rack 831. During the movement of the driving plate 81, the first gear 833 and the second gear 835 will rotate under the control of the corresponding rack 831. When the first gear 833 rotates, the limit plate 7 is driven to rotate through the rotating shaft 1 832. At this time, the limit plate 7 in the movable groove 12 can be rotated into the limit groove 13, so that the lower side of the limit plate 7 is in conflict with the lower inner wall of the limit groove 13, the connecting seat 2 2 is limited, and the connecting seat 2 2 is locked on the connecting seat 1 1. At the same time, the movement of the driving plate 81 will pull the sliding column 841 upward through the transmission plate 842, so that the fish counter 4 originally outside the lower side of the connecting seat 2 can move upward and shrink into the installation opening 21. In this process, the second gear 835 will also rotate accordingly to drive the two sealing plates 5 to rotate closer to each other, thereby sealing the installation opening 21. The stability of the overall structure is improved and the fish counter 4 can be protected.

[0041] Correspondingly, when it is necessary to separate the connecting seat 2 from the connecting seat 1 for detection, it is only necessary to rotate the motor 2 836 to control the third gear 837 to rotate in the opposite direction, so that the limit plate 7 can be rotated out of the limit groove 13, and the connecting seat 2 2 and the connecting seat 1 1 are no longer locked. At the same time, the sealing plate 5 is opened after rotating a certain angle, and the fish school technology instrument can automatically extend out of the installation port 21.

[0042] See also Figure 1 and Figure 4 An annular counterweight chamber 24 is provided inside the connecting seat 2 below the driving chamber 23 and between the cavity 22. An injection port connected to the counterweight chamber 24 is provided on the upper side of the connecting seat 2, and a sealing plug is threadedly connected to the upper end of the injection port.

[0043] During specific operation, a certain amount of balancing liquid (such as water) can be injected into the balancing cavity 24 to balance the connecting seat 2, ensuring that the connecting seat 2 has a certain wind resistance. At the same time, the connecting seat 2 has a disc structure and an arc-shaped outer wall, which reduces wind resistance and improves the stability of the fish counter 4 during operation.

[0044] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A fish counting device based on a drone, comprising a connection base (1) connected to a drone body, characterized in that: The connecting seat 1 (1) is connected to the connecting seat 2 (2) below, the connecting seat 1 (1) and the connecting seat 2 (2) are both in a disc structure, a line-releasing mechanism (3) is provided between the connecting seat 1 (1) and the connecting seat 2 (2), a mounting opening (21) is provided on the lower side of the connecting seat 2 (2), and a fish counter (4) is provided in the mounting opening (21); The lower side of the connecting seat 1 (1) is provided with a front guide groove (11), the upper side of the connecting seat 2 (2) is fixedly provided with a front guide seat (6) adapted to the front guide groove (11), the lower side of the connecting seat 1 (1) is provided with an annular movable groove (12) at the edge of the lower end of the front guide groove (11), the inner wall of the movable groove (12) close to the upper side is provided with a limiting groove (13) extending along the circumference thereof, two limiting plates (7) are rotatably provided above the connecting seat 2 (2) and are symmetrical with the center of the connecting seat 2 (2) as the center, and a driving mechanism (8) is provided inside the connecting seat 2 (2); The wire-releasing mechanism (3) controls the second connecting seat (2) to move toward the first connecting seat (1) to control the front guide seat (6) to be inserted into the front guide groove (11), and controls the limit plate (7) inserted into the limit groove (13) to rotate through the driving mechanism (8) to lock the second connecting seat (2) with the first connecting seat (1).

2. The fish counting device based on drone according to claim 1, characterized in that: A wire storage chamber (14) is provided in a position near the upper side of the connecting seat 1 (1); the wire releasing mechanism (3) comprises a wire drum (31) rotatably arranged in the wire storage chamber (14); a wire threading hole communicating with the front guide groove (11) is provided on the lower inner wall of the wire storage chamber (14); a guide member 1 (32) is provided in any position near the edge of the wire drum (31) in the wire storage chamber (14); a guide member 2 (33) is provided in the wire threading hole; and a traction rope (34) is commonly connected between the wire drum (31), the guide member 1 (32), the guide member 2 (33) and the front guide seat (6).

3. The fish counting device based on drone according to claim 2, characterized in that: The guide member 1 (32) includes two guide rollers 1, which are both rotatably arranged on the front and rear inner walls of the threading hole and are symmetrical with respect to each other with the center of the connecting seat 1 (1) as the center. The traction rope (34) is movably arranged between the two guide rollers 1. The guide member 2 (33) includes two support plates fixedly arranged on the lower inner wall of the wire storage cavity (14) and symmetrical in front and back. Two guide rollers 2 distributed up and down are rotatably arranged between the two support plates. The traction rope (34) is slidably arranged between the upper and lower guide rollers 2.

4. The fish counting device based on drone according to claim 2, characterized in that: The wire-releasing mechanism (3) further comprises a motor (35) fixedly arranged inside the connecting seat (1) and close to the upper side, wherein the output shaft of the motor (35) is fixedly connected to the upper side of the wire drum (31).

5. The fish counting device based on drone according to claim 1, characterized in that: A cavity (22) is provided on the inner wall of the port near the lower side of the installation opening (21), and two sealing plates (5) are rotatably arranged in the cavity (22) so as to be symmetrical with the center of the second connecting seat (2) as the center.

6. The fish counting device based on drone according to claim 5, characterized in that: A driving cavity (23) having a rectangular structure is provided at a position near the upper side of the second connecting seat (2). A driving plate (81) is provided in the driving cavity (23) and is slidable along its length direction. Slide blocks (82) are fixedly provided on both shorter sides of the driving plate (81). The slide blocks (82) are slidably connected to the driving cavity (23). A first transmission assembly (83) is provided between the driving plate (81) and the two limit plates (7) and the two sealing plates (5). A second transmission assembly (84) is provided between the driving plate (81) and the fish counter (4).

7. The fish counting device based on drone according to claim 6, characterized in that: The surface of the driving plate (81) is provided with a plurality of movable holes (811) along its length direction; the first transmission assembly (83) comprises a rack (831) fixedly arranged on the inner wall at the rear side of the movable hole (811); a rotating shaft (832) rotatably arranged on the second connecting seat (2) is fixedly arranged on the lower side of the limiting plate (7); the lower end of the rotating shaft (832) movably passes through the corresponding movable hole (811) and is rotatably connected to the lower inner wall of the driving cavity (23); a first gear (833) is fixedly arranged on the outer wall of the rotating shaft (832) located inside the movable hole (811); the first gear (833) meshes with the rack (831) on the inner wall at the rear side of the corresponding movable hole (811).

8. The fish counting device based on drone according to claim 7, characterized in that: The first transmission assembly (83) further comprises a second rotating shaft (834) fixedly connected to the sealing plate (5); the lower end of the second rotating shaft (834) is rotatably connected to the lower inner wall of the cavity (22); the upper end of the second rotating shaft (834) movably passes through the corresponding movable hole (811) and is rotatably connected to the upper inner wall of the driving cavity (23); the second rotating shaft (834) is rotatably connected to the second connecting seat (2); the second rotating shaft (834) is fixedly connected to the outer wall of the movable hole (811) A second gear (835) is fixedly provided, the second gear (835) meshing with a rack (831) on the inner wall at the rear side of the corresponding movable hole (811), a second motor (836) is fixedly provided inside the front guide seat (6), an output shaft of the front guide seat (6) is fixedly connected to a third gear (837) rotatably provided in the corresponding movable hole (811), the third gear (837) meshing with a rack (831) on the inner wall at the rear side of the corresponding movable hole (811).

9. The fish counting device based on drone according to claim 6, characterized in that: A sliding hole communicating with the drive chamber (23) is provided on the upper inner wall of the mounting opening (21); the second drive assembly comprises a sliding column (841) fixedly connected to the upper side of the fish counter (4); the sliding column (841) is slidably connected to the sliding hole; balls are rotatably provided on the surrounding side walls of the sliding column (841); the balls are rollingly connected to the inner side walls corresponding to the sliding hole; a transmission plate (842) is hingedly connected to the upper side of the sliding column (841); and a side of the transmission plate (842) away from the sliding column (841) is hingedly connected to the lower side of the drive plate (81).

10. The fish counting device based on drone according to claim 9, characterized in that: An annular counterweight cavity (24) is provided inside the second connecting seat (2) at a position below the drive cavity (23) and between the cavity (22); an injection port communicating with the counterweight cavity (24) is provided on the upper side of the second connecting seat (2); a sealing plug is threadedly connected to the upper end of the injection port.

Images