Unmanned aerial vehicle based fish count device

Abstract

The application belongs to the field of fish population monitoring, and particularly relates to a fish population counting device based on a UAV, which comprises a connecting seat one connected with a UAV body, a connecting seat two connected below the connecting seat one, wherein the connecting seat one and the connecting seat two are both in a disc structure, a pay-off mechanism is arranged between the connecting seat one and the connecting seat two, a mounting port is formed in the lower side of the connecting seat two, and a fish population counter is arranged in the mounting port. A front guide groove is formed in the lower side of the connecting seat one, a front guide seat matched with the front guide groove is fixedly arranged on the upper side of the connecting seat two, a movable groove in a ring shape is formed in the edge of the lower end of the front guide groove of the connecting seat one, and a limiting groove extending along the circumferential direction is formed in the inner wall close to the upper side of the movable groove. The fish population counter can be as close to the fish population as possible, and the accuracy of fish population monitoring and counting can be further improved without disturbing the fish population.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of fish population monitoring, and particularly relates to a fish population counting device based on a UAV. BACKGROUND

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

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

[0004] However, the existing fish population counting device based on a UAV has the following defects in actual use: Although the UAV can carry the fish population counting device to record fish populations from high altitudes, the UAV generates some noise when it is working. In particular, in order to stably carry the fish population counting device, the UAV used is generally large in size and high in power. The UAV needs to be at a very high span above the water surface to ensure that the noise does not affect the fish populations on the water surface. This makes the distance between the fish population counting device and the fish populations on the water surface larger, which greatly affects the clarity of the fish population counting device in recording the fish populations, and further affects the subsequent analysis and processing based on the recorded images, thereby affecting the counting accuracy of the fish populations. SUMMARY

[0005] In view of the above problems, the fish population counting device based on a UAV provided by the embodiments of the present application can make the fish population counter as close to the fish populations as possible, and further improve the accuracy of fish population monitoring and counting without disturbing the fish populations.

[0006] In order to achieve the above object, the embodiment of the present application provides the following technical scheme: the present application provides a fish population counting device based on a UAV, which comprises a connecting seat one connected with a UAV body, a connecting seat two connected below the connecting seat one, the connecting seat one and the connecting seat two both being disc structures, a pay-off mechanism being jointly arranged between the connecting seat one and the connecting seat two, a mounting port being formed on the lower side of the connecting seat two, and a fish population counter being arranged in the mounting port. A front guide groove is formed on the lower side of the connecting seat one, a front guide seat matched with the front guide groove is fixedly arranged on the upper side of the connecting seat two, a movable groove in a ring shape is formed on the edge of the lower end of the front guide groove on the lower side of the connecting seat one, a limiting groove extending along the circumferential direction is formed on the inner wall close to the upper side of the movable groove, two limiting plates symmetrically arranged with the center of the connecting seat two as the center are rotatably arranged above the connecting seat two, and a driving mechanism is arranged in the connecting seat two. The pay-off mechanism controls the connecting seat two to move towards the connecting seat one, controls the front guide seat to be inserted into the front guide groove, and controls the limiting plate inserted into the limiting groove to rotate to lock the connecting seat two and the connecting seat one.

[0007] According to an advantageous embodiment, a wire storage cavity is formed on the inner side close to the upper side of the connecting seat one, the pay-off mechanism comprises a wire reel rotatably arranged in the wire storage cavity, a wire hole is formed on the lower inner wall of the wire storage cavity and communicates with the front guide groove, a guide piece one is arranged at any position close to the edge of the wire reel in the inner part of the wire storage cavity, a guide piece two is arranged in the wire hole, and a traction rope is jointly connected between the wire reel, the guide piece one, the guide piece two and the front guide seat.

[0008] According to an advantageous embodiment, the guide piece one comprises two guide rollers one, the two guide rollers one are rotatably arranged on the front and rear inner walls of the wire hole and symmetrically arranged with the center of the connecting seat one as the center, the traction rope is movably arranged between the two guide rollers one, the guide piece two comprises two support plates fixedly arranged on the lower inner wall of the wire storage cavity and symmetrically arranged front and rear, two guide rollers two distributed up and down are rotatably arranged between the two support plates, and the traction rope is slidably arranged between the two guide rollers two distributed up and down.

[0009] According to an advantageous embodiment, the pay-off mechanism further comprises a motor one fixedly arranged in the inner part of the connecting seat one and close to the upper side, and the output shaft of the motor one is fixedly connected with the upper side of the wire reel.

[0010] According to an advantageous embodiment, a cavity is formed on the inner wall of the port close to the lower side of the mounting port, and two sealing plates symmetrically arranged with the center of the connecting seat two as the center are rotatably arranged in the cavity.

[0011] According to an advantageous embodiment, the interior of the connecting seat two is provided with a driving cavity in a rectangular structure near the upper side, a driving plate is arranged in the driving cavity and slides along the length direction of the driving cavity, the two shorter sides of the driving plate are fixedly provided with sliding blocks, the sliding blocks are in sliding connection with the driving cavity, the driving plate is jointly provided with a first transmission assembly between the two limiting plates and the two sealing plates, and the driving plate is jointly provided with a second transmission assembly with the fish population counter.

[0012] According to an advantageous embodiment, a plurality of movable holes are formed in the surface of the driving plate along the length direction of the driving plate, the first transmission assembly comprises a rack fixedly arranged on the rear inner wall of the movable hole, the lower side of the limiting plate is fixedly provided with a rotating shaft one rotatably arranged on the connecting seat two, the lower end of the rotating shaft one is movably penetrated through the corresponding movable hole and is in rotational connection with the lower inner wall of the driving cavity, the outer wall of the rotating shaft one in the movable hole is fixedly provided with a first gear, and the first gear is in meshing connection with the rack on the rear inner wall of the corresponding movable hole.

[0013] According to an advantageous embodiment, the first transmission assembly further comprises a rotating shaft two fixedly connected with the sealing plate, the lower end of the rotating shaft two is in rotational connection with the lower inner wall of the cavity, the upper end of the rotating shaft two is movably penetrated through the corresponding movable hole and is in rotational connection with the upper inner wall of the driving cavity, the rotating shaft two is in rotational connection with the connecting seat two, the outer wall of the rotating shaft two in the movable hole is fixedly provided with a second gear, the second gear is in meshing connection with the rack on the rear inner wall of the corresponding movable hole, and the interior of the front guide seat is fixedly provided with a motor two, the output shaft of the front guide seat is fixedly connected with a third gear rotatably arranged in the corresponding movable hole, and the third gear is in meshing connection with the rack on the rear inner wall of the corresponding movable hole.

[0014] According to an advantageous embodiment, the upper inner wall of the mounting port is provided with a sliding hole in communication with the driving cavity, the second transmission assembly comprises a sliding column fixedly connected with the upper side of the fish population counter, the sliding column is in sliding connection with the sliding hole, the peripheral side wall of the sliding column is rotatably provided with a plurality of rolling balls, the rolling balls are in rolling connection with the corresponding inner side wall of the sliding hole, and the upper side of the sliding column is hingedly connected with a transmission plate, and the side, away from the sliding column, of the transmission plate is hingedly connected with the lower side of the driving plate.

[0015] According to an advantageous embodiment, the interior of the connecting seat two is provided with a counterweight cavity in a ring shape between the lower side of the driving cavity and the cavity, the upper side of the connecting seat two is provided with a liquid injection port in communication with the counterweight cavity, and the upper end of the liquid injection port is threadedly connected with a sealing plug.

[0016] Compared with the prior art, the fish population counting device based on the unmanned aerial vehicle provided by the embodiment of the present application has the following beneficial effects:

[0017] 1. In this invention, the connecting seat one and connecting seat two can cooperate with the line-laying mechanism to bring the fish counter as close as possible to the fish school, thereby further improving the accuracy of fish school monitoring and counting without disturbing the fish school.

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

[0019] 3. In this invention, the drive mechanism can also control the fish counter to extend or retract into the installation port as needed, and simultaneously control the opening and closing of the installation port through the sealing plate, which facilitates monitoring and protects the fish counter when it is not in use.

[0020] 4. In this invention, the connecting seat 2 is in the shape of a disc, which can effectively reduce wind resistance, and it is equipped 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. Attached Figure Description

[0021] Figure 1 This is a three-dimensional view of the external structure of the present invention.

[0022] Figure 2 This is the external front view structural diagram of the present invention.

[0023] Figure 3 This is a front plan sectional view of the connecting seat 1 in this invention.

[0024] Figure 4 This is a front plan sectional view of the connecting seat 2 in this invention.

[0025] Figure 5 This is a planar sectional view of the connecting seat one and connecting seat two after they are connected in this invention.

[0026] Figure 6 This is a three-dimensional structural diagram of the driving mechanism in this invention.

[0027] The figure reference: 1, connecting seat one; 11, front guide groove; 12, movable slot; 13, limiting groove; 14, line storage cavity; 2, connecting seat two; 21, mounting port; 22, cavity; 23, drive cavity; 24, counterweight cavity; 3, line release mechanism; 31, reel; 32, guide piece one; 33, guide piece two; 34, traction rope; 35, motor one; 4, fish population counter; 5, sealing plate; 6, front guide seat; 7, limiting plate; 8, drive mechanism; 81, drive plate; 811, movable hole; 82, sliding block; 83, first transmission assembly; 831, rack; 832, first rotating shaft; 833, first gear; 834, second rotating shaft; 835, second gear; 836, motor two; 837, third gear; 84, second transmission assembly; 841, sliding column; 842, transmission plate. DETAILED DESCRIPTION

[0028] The following will be described in detail in combination with the accompanying drawings Figures 1-6 Further detailed description will be made to the present application.

[0029] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 , the fish population counting device based on unmanned aerial vehicle, including connecting seat one 1 connected with unmanned aerial vehicle body, the lower side of connecting seat one 1 is provided with front guide groove 11, connecting seat one 1 is connected with connecting seat two 2 below, the upper side of connecting seat two 2 is fixedly provided with front guide seat 6 matched with front guide groove 11, connecting seat one 1 and connecting seat two 2 are both disc structure, connecting seat one 1 and connecting seat two 2 are jointly provided with line release mechanism 3, the lower side of connecting seat two 2 is provided with mounting port 21, and fish population counter 4 is arranged in mounting port 21.

[0030] Refer to Figure 3 and Figure 5 , the inside of connecting seat one 1 is provided with line storage cavity 14 near the upper side, line release mechanism 3 includes reel 31 rotationally arranged in line storage cavity 14, the lower side inner wall of line storage cavity 14 is provided with threading hole communicated with front guide groove 11, the inside of line storage cavity 14 is provided with guide piece one 32 near the edge of reel 31, the threading hole is provided with guide piece two 33, and reel 31, guide piece one 32, guide piece two 33 and front guide seat 6 are jointly connected with traction rope 34.

[0031] Refer to Figure 3The guiding piece one 32 comprises two guiding rollers one, both of which are rotationally arranged on the front and rear inner walls of the threading hole and are symmetrically centered on the center of the connecting seat one 1, and the traction rope 34 is movably arranged between the two guiding rollers one, the guiding piece two 33 comprises two support plates symmetrically arranged on the lower inner wall of the wire storage cavity 14, and the two support plates are jointly rotationally arranged with two guiding rollers two distributed above and below, and the traction rope 34 is slidably arranged between the two guiding rollers two.

[0032] In particular, in the normal state, the front guide seat 6 on the upper side of the connecting seat two 2 is inserted into the front guide groove 11 on the lower side of the connecting seat one 1, so that the connecting seat one 1 and the connecting seat two 2 are attached together, facilitating the overall transportation.

[0033] In the process of monitoring the number of fish, the whole is taken to a certain height above the monitoring water area by an external unmanned aerial vehicle, and then the wire reel 31 is driven to rotate forward by the motor one 35 to pay out the wire, the traction rope 34 is guided by the guiding rollers one and two to stably pay out the wire, so that the connecting seat two 2 is separated from below the connecting seat one 1 and gradually moves down to approach the water surface, the wire paying-out process is relatively quiet, and the connecting seat two 2 with the fish population counter 4 can be stably moved to a position closer to the fish population, and then the counting work is performed by the fish population counter 4. After the counting is completed, the wire reel 31 is driven to rotate reversely by the motor one 35 to take up the wire, the connecting seat two 2 is pulled up by the traction rope 34, and the process ends when the front guide seat 6 on the upper side of the connecting seat two 2 is inserted into the front guide groove 11 on the lower side of the connecting seat one 1. The front guide seat 6 and the front guide groove 11 cooperate to guide the alignment and attachment of the connecting seat one 1 and the connecting seat two 2.

[0034] Referring to Figure 3 , Figure 4 and Figure 5 , the lower side of the connecting seat one 1 is provided with a movable groove 12 in the form of a ring at the edge of the front guide groove 11 lower end, and the movable groove 12 is provided with a limiting groove 13 extending along the circumferential direction on the inner wall close to the upper side, the connecting seat two 2 is rotationally arranged with two limiting plates 7 symmetrically centered on the center of the connecting seat two 2, and the inside of the connecting seat two 2 is provided with a driving mechanism 8.

[0035] Referring to Figure 4 , the mounting port 21 is provided with a cavity 22 on the inner wall of the port close to the lower side, and the cavity 22 is rotationally arranged with two sealing plates 5 symmetrically centered on the center of the connecting seat two 2.

[0036] Referring to Figure 4The inner side of the connecting seat two 2 is provided with a rectangular driving cavity 23 near the upper side, a driving plate 81 is arranged in the driving cavity 23 and slides along the length direction of the driving cavity 23, the two shorter sides of the driving plate 81 are fixedly provided with sliding blocks 82 which are in sliding connection with the driving cavity 23, the first transmission assembly 83 is arranged between the driving plate 81 and the two limiting plates 7 and the two sealing plates 5, and the second transmission assembly 84 is arranged between the driving plate 81 and the fish population counter 4.

[0037] Referring to Figure 4 and Figure 6 A plurality of movable holes 811 are formed in the surface of the driving plate 81 along the length direction of the driving plate 81, the first transmission assembly 83 comprises a gear rack 831 fixedly arranged on the inner wall of the rear side of the movable hole 811, the lower side of the limiting plate 7 is fixedly provided with a rotating shaft one 832 which is rotatably arranged on the connecting seat two 2, the lower end of the rotating shaft one 832 is movably penetrated through the corresponding movable hole 811 and is in rotational connection with the lower inner wall of the driving cavity 23, the outer wall of the rotating shaft one 832 in the movable hole 811 is fixedly provided with a first gear 833, and the first gear 833 is in meshing connection with the gear rack 831 on the inner wall of the rear side of the corresponding movable hole 811.

[0038] Referring to Figure 4 、 Figure 5 and Figure 6 The first transmission assembly 83 further comprises a rotating shaft two 834 fixedly connected with the sealing plate 5, the lower end of the rotating shaft two 834 is in rotational connection with the lower inner wall of the cavity 22, the upper end of the rotating shaft two 834 is movably penetrated through the corresponding movable hole 811 and is in rotational connection with the upper inner wall of the driving cavity 23, the rotating shaft two 834 is in rotational connection with the connecting seat two 2, the outer wall of the rotating shaft two 834 in the movable hole 811 is fixedly provided with a second gear 835, and the second gear 835 is in meshing connection with the gear rack 831 on the inner wall of the rear side of the corresponding movable hole 811, the inner side of the front guide seat 6 is fixedly provided with a motor two 836, the output shaft of the front guide seat 6 is fixedly connected with a third gear 837 which is rotatably arranged in the corresponding movable hole 811, and the third gear 837 is in meshing connection with the gear rack 831 on the inner wall of the rear side of the corresponding movable hole 811.

[0039] Referring to Figure 4 and Figure 6 A sliding hole in communication with the driving cavity 23 is formed in the upper inner wall of the mounting port 21, the second transmission assembly 84 comprises a sliding column 841 fixedly connected with the upper side of the fish population counter 4, the sliding column 841 is in sliding connection with the sliding hole, a plurality of rolling balls are rotatably arranged on the four peripheral side walls of the sliding column 841, the rolling balls are in rolling connection with the corresponding inner side walls of the sliding hole, and the upper side of the sliding column 841 is hingedly connected with a transmission plate 842, and the side of the transmission plate 842 away from the sliding column 841 is hingedly connected with the lower side of the driving plate 81.

[0040] Specifically, when the first connecting seat 1 and the second connecting seat 2 need to be fixed together, the first connecting seat 1 and the second connecting seat 2 are connected together through the traction rope 34, at this time, the limiting plate 7 is first inserted into the movable groove 12, then the third gear 837 is driven to rotate in the forward direction through the motor two 836, the driving plate 81 moves under the cooperation of the corresponding rack 831, in the process of movement of the driving plate 81, the first gear 833 and the second gear 835 rotate under the control of the corresponding rack 831, when the first gear 833 rotates, the limiting plate 7 is driven to rotate through the rotating shaft one 832, at this time, the limiting plate 7 in the movable groove 12 can rotate into the limiting groove 13, so that the lower side of the limiting plate 7 is in contact with the lower side inner wall of the limiting groove 13, the second connecting seat 2 is limited, and the second connecting seat 2 is locked on the first connecting seat 1. At the same time, the movement of the driving plate 81 pulls the slide column 841 to move upward through the transmission plate 842, so that the fish population counter 4 originally outside the lower side of the second connecting seat 2 can move upward to shrink into the mounting port 21. And in this process, the second gear 835 also rotates correspondingly to drive the two sealing plates 5 to rotate and approach each other, sealing the mounting port 21. The stability of the overall structure is improved, and the fish population counter 4 can be protected.

[0041] Correspondingly, when the second connecting seat 2 needs to be separated from the first connecting seat 1 for detection work, only the third gear 837 is driven to rotate in the reverse direction through the motor two 836, so that the limiting plate 7 rotates out of the limiting groove 13, and the second connecting seat 2 and the first connecting seat 1 are no longer locked, at the same time, the sealing plate 5 rotates to open after rotating by a certain angle, and the fish population counter can automatically extend out of the mounting port 21.

[0042] Referring to Figure 1 and Figure 4 , the inside of the second connecting seat 2 is located between the lower side of the driving cavity 23 and the cavity 22, and a counterweight cavity 24 in the form of a ring is arranged at this position, the upper side of the second connecting seat 2 is provided with a liquid injection port in communication with the counterweight cavity 24, and the upper end of the liquid injection port is threadedly connected with a sealing plug.

[0043] Specifically, a certain amount of counterweight liquid (such as water) can be injected into the counterweight cavity 24 to counterweight the second connecting seat 2, so as to ensure that the second connecting seat 2 has certain wind resistance, at the same time, the second connecting seat 2 has a disc structure, and the outer wall is arc-shaped, which reduces the wind resistance and improves the stability of the fish population counter 4 during work.

[0044] The above is only an embodiment of the present application, and does not limit the patent range of the present application, any equivalent structure or equivalent process transformation obtained by using the content of the specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection range of the present application.

Claims

1. A fish swarm counting device based on a drone, comprising a connector (1) connected to the drone body, characterized in that: Connector 1 (1) is connected to connector 2 (2) below it. Both connector 1 (1) and connector 2 (2) are disc-shaped. A line feeding mechanism (3) is provided between connector 1 (1) and connector 2 (2). An installation port (21) is opened on the lower side of connector 2 (2). A fish counting instrument (4) is installed in the installation port (21). The lower side of the first connecting seat (1) is provided with a front guide groove (11), and the upper side of the second connecting seat (2) is fixedly provided with a front guide seat (6) that is compatible with the front guide groove (11). The lower side of the first connecting seat (1) is provided with an annular movable groove (12) at the edge of the lower port of the front guide groove (11). The movable groove (12) is provided with a limiting groove (13) extending circumferentially on the inner wall near the upper side. The second connecting seat (2) is rotatably provided with two limiting plates (7) symmetrically arranged with the center of the second connecting seat (2) as the center. The second connecting seat (2) is provided with a driving mechanism (8) inside. The wire feeding mechanism (3) controls the second connecting seat (2) to move toward the first connecting seat (1) and controls the front guide seat (6) to be inserted into the front guide groove (11). The driving mechanism (8) controls the limit plate (7) inserted into the limit groove (13) to rotate and lock the second connecting seat (2) and the first connecting seat (1). A cavity (22) is provided on the inner wall of the port near the lower side of the installation port (21). Two sealing plates (5) are rotatably arranged in the cavity (22) with the center of the connecting seat (2) as the center. The connecting seat 2 (2) has a rectangular drive cavity (23) located near the upper side. The drive cavity (23) is equipped with a drive plate (81) that slides along its length. Slider (82) is fixedly installed on both shorter sides of the drive plate (81). The slider (82) is slidably connected to the drive cavity (23). A first transmission assembly (83) is provided between the drive plate (81), the two limiting plates (7), and the two sealing plates (5). A second transmission assembly (84) is provided between the drive plate (81) and the fish counter (4). The surface of the drive plate (81) is provided with a plurality of movable holes (811) along its length direction. The first transmission component (83) includes a rack (831) fixedly disposed on the inner wall of the rear side of the movable hole (811). The lower side of the limiting plate (7) is fixedly provided with a rotating shaft (832) rotatably disposed on the connecting seat (2). The lower end of the rotating shaft (832) rotatably passes through the corresponding movable hole (811) and is rotatably connected to the inner wall of the lower side of the drive cavity (23). The outer wall of the rotating shaft (832) located inside the movable hole (811) is fixedly provided with a first gear (833). The first gear (833) meshes with the rack (831) on the inner wall of the rear side of the corresponding movable hole (811). The first transmission assembly (83) further 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 drive cavity (23). The second rotating shaft (834) is rotatably connected to the second connecting seat (2). The second rotating shaft (834) is fixedly located on the outer wall inside the movable hole (811). A second gear (835) is fixedly provided, which meshes with a rack (831) on the inner wall of the corresponding movable hole (811). A second motor (836) is fixedly provided inside the front guide seat (6). A third gear (837) is fixedly connected to the output shaft of the front guide seat (6) and rotatably provided in the corresponding movable hole (811). The third gear (837) meshes with a rack (831) on the inner wall of the corresponding movable hole (811).

2. The fish swarm counting device based on unmanned aerial vehicles according to claim 1, characterized in that, The connecting seat (1) has a wire storage cavity (14) located near the upper side. The wire feeding mechanism (3) includes a wire reel (31) rotatably disposed in the wire storage cavity (14). The lower inner wall of the wire storage cavity (14) has a threading hole communicating with the front guide groove (11). A guide member (32) is disposed at any position near the edge of the wire reel (31) inside the wire storage cavity (14). A guide member (33) is disposed in the threading hole. A traction rope (34) is connected to the wire reel (31), the guide member (32), the guide member (33), and the front guide seat (6).

3. The fish swarm counting device based on unmanned aerial vehicles according to claim 2, characterized in that, The first guide (32) includes two guide rollers, both of which are rotatably mounted on the front and rear inner walls of the wire hole and are symmetrical about the center of the connecting seat (1). The traction rope (34) is movably mounted between the two guide rollers. The second guide (33) includes two support plates fixedly mounted on the lower inner wall of the wire storage cavity (14) and symmetrically mounted front and rear. Two guide rollers are rotatably mounted between the two support plates and are distributed vertically. The traction rope (34) is slidably mounted between the upper and lower guide rollers.

4. The fish swarm counting device based on unmanned aerial vehicles according to claim 2, characterized in that, The wire feeding mechanism (3) also includes a motor (35) fixedly installed inside the connecting seat (1) and near the upper side, and the output shaft of the motor (35) is fixedly connected to the upper side of the wire reel (31).

5. The fish swarm counting device based on a drone according to claim 1, characterized in that, The upper inner wall of the mounting port (21) is provided with a sliding hole communicating with the drive cavity (23). The second transmission assembly (84) 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. Rollers are rotatably provided on the four sides of the sliding column (841). The rollers are slidably connected to the inner side wall corresponding to the sliding hole. A transmission plate (842) is hinged to 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 drive plate (81).

6. The fish swarm counting device based on a drone according to claim 5, characterized in that, The interior of the connecting seat 2 (2) is provided with an annular counterweight cavity (24) located below the driving cavity (23) and between the cavity (22). The upper side of the connecting seat 2 (2) is provided with an injection port that communicates with the counterweight cavity (24). The upper port of the injection port is threaded with a sealing plug.

Images