Artificial floating island for nesting of common swallow gull

Abstract

The invention belongs to the technical field of artificial floating islands, and particularly relates to an artificial floating island for nesting of common swallow gull. Comprising a cystosepiment, the bottom of the cystosepiment is fixedly connected with a bamboo pole, and circular grooves are formed in the positions, located at the four corners of the cystosepiment, of the bamboo pole; the artificial floating island for nesting of the common swallow gull further comprises a buoyancy control unit. A plurality of buoyancy control units are evenly arranged on the periphery of a foam board, a first air bag is arranged on each buoyancy control unit, and each buoyancy control unit changes the buoyancy of the foam board by changing whether the first air bag expands or not; therefore, the draft of the floating island is changed and the inclination of the floating island is adjusted; and the sinking and inclination risks of the floating island are reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of artificial floating islands, in particular to an artificial floating island for common terns to build nests. Background Art

[0002] In the monitoring of bird reproduction, it was found that terrestrial mammals such as yellow weasels would go to the breeding islands where birds nest to prey on bird eggs or chicks; the drastic water level fluctuations caused by summer rainstorms would submerge bird nests; these factors had a great impact on ground-breeding birds, causing some birds to fail to reproduce; how to improve the success rate of bird reproduction is a new problem facing bird protection; providing artificial floating islands is a good way to solve this problem; During the use of artificial floating islands, rain, tern landing, tern breeding and other reasons may cause the load of artificial floating islands to increase, which may lead to the artificial floating islands sinking, increased draft depth and other problems, affecting the use of artificial floating islands, and in severe cases may cause the artificial floating islands to sink; and terns are very likely to be unevenly distributed on the floating islands, which may cause the floating islands to tilt, and in severe cases may also cause the floating islands to sink; In view of this, the present invention solves the above technical problems by proposing an artificial floating island for common terns to build nests. Summary of the invention

[0003] In order to make up for the shortcomings of the prior art, the buoyancy of the foam board can be changed, thereby changing the draft of the floating island and adjusting the inclination of the floating island; the present invention provides an artificial floating island for common terns to build nests.

[0004] The technical solution adopted by the present invention to solve the technical problem is: an artificial floating island for common terns to build nests, comprising: a foam board, a bamboo pole is fixedly connected to the bottom of the foam board, and round grooves are opened on the bamboo pole and located at the four corners of the foam board; the artificial floating island for common terns to build nests also includes: a buoyancy control unit, a plurality of buoyancy control units are evenly arranged around the foam board, each of the buoyancy control units is provided with a No. 1 airbag, each of the buoyancy control units changes the buoyancy of the foam board by changing whether the No. 1 airbag is expanded or not, thereby changing the draft of the floating island and adjusting the inclination of the floating island; reducing the risk of sinking and tilting of the floating island; In this application, bamboo poles from sea drift garbage are used as the framework of the platform, and foam boards are used as the main body to build a floating platform; it is mainly aimed at birds such as sandpipers, black-headed gulls and common terns; because these birds usually breed in clusters during the breeding season, the breeding habitat area required is relatively large, and the size of the floating island is designed to be 10m in length and width. Foam boards made of lightweight and water-resistant materials are spliced. The color of the foam board (1m*1m*20cm) is chosen to be dark brown close to the soil, and there is a gap in the middle of the foam board for drainage; the bottom framework is built with bamboo poles. First, a 5m*5m floating island is built. Six 6m-long bamboo poles are used at the bottom (if not enough, they can be spliced), and two 5m-long bamboo poles are used. The foam board is connected with a pole and covered with non-woven fabric. In order to prevent soil loss, reed bundles or bamboo strips are tied around the upper layer of the foam board as baffles. In order to ensure the stability of the floating island, four circular grooves with an aperture of 7 cm are reserved on the bamboo poles around the island, and smooth bamboo poles (diameter of 6 cm) are inserted to fix them. The length of each bamboo pole is 3.5 m and the length inserted into the ground is 1 m, so that the foam board can slide up and down with the water level without shifting left and right. For the reverse-billed sandpiper and common tern, 10 cm of bare soil is laid on the upper layer of the non-woven fabric. For the black-headed gull, 10 cm of soil is laid on the upper layer of the non-woven fabric and Suaeda salsa is transplanted. Specimens of Charadriiformes birds can be placed on the floating island to attract birds to nest on it.

[0005] Preferably, the buoyancy control unit comprises: a base, the side wall of the foam board is fixedly connected to the base, the bottom of the base is provided with a cavity, the interior of the cavity is fixedly connected to a No. 1 airbag, and the top of the base is provided with a No. 1 tube, the top of the base is fixedly connected to a No. 1 tube located around the fitting groove, the inner top of the No. 1 tube is fixedly connected to a No. 1 electromagnet, the bottom of the No. 1 electromagnet is fixedly connected to a No. 1 spring, the other end of the No. 1 spring is fixedly connected to a piston block, a permanent magnet is provided inside the piston block, the piston block is slidably connected to the interior of the No. 1 tube, when the No. 1 electromagnet is energized, the piston block moves away from the No. 1 electromagnet, and a No. 1 tube is fixedly connected to the interior of the No. 1 tube, and the No. 1 tube connects the interior of the No. 1 tube with the interior of the No. 1 airbag.

[0006] Preferably, a control block is fixedly connected to one side of the base, an insulating plate is provided on the side wall of the control block, two conductive rods are fixedly provided on the insulating plate, and when the two conductive rods are immersed in water, the first electromagnet is energized; When the floating island sinks or tilts, all or part of the two conductive rods on the buoyancy control unit are submerged in the water, and the No. 1 electromagnet on the corresponding buoyancy control unit is energized. The piston block moves away from the No. 1 electromagnet, pressing the air in the No. 1 cylinder into the No. 1 airbag, and the corresponding No. 1 airbag expands to increase the buoyancy. The buoyancy of the part where the foam board is connected to the corresponding buoyancy control unit is increased and lifted, thereby causing the floating island to move up or improve its inclination.

[0007] Preferably, a No. 1 cavity is opened inside the control block, a No. 1 telescopic rod is fixedly connected to the top of the No. 1 cavity, a connecting plate is fixedly connected to the bottom of the No. 1 telescopic rod, a long groove is opened on the side wall of the control block, and the connecting plate passes through the long groove and is fixedly connected to the insulating plate.

[0008] Preferably, a stepped groove is provided inside the control block and near the No. 1 tube, and the stepped groove is adjacent to the No. 1 cavity; a No. 1 plate is slidably connected in the stepped groove, a No. 2 spring is fixedly connected between the No. 1 plate and the end of the stepped groove, a No. 1 block is fixedly connected to the top of the No. 1 plate near the No. 1 tube, a No. 3 spring is fixedly connected to the other end of the No. 1 block, and a No. 3 spring is fixedly connected to the other end of the No. 3 spring; a slot is provided at the side wall of the piston block corresponding to the pin, and the pin penetrates the control block and the side wall of the base and can enter the matching groove and be inserted into the slot; two metal contacts are fixedly connected to the side of the connecting plate facing the stepped groove, and the two metal contacts are electrically connected to the two conductive rods respectively, and two metal strips are fixedly provided at the positions of the No. 1 plate corresponding to the two metal contacts; the control circuit of the No. 1 electromagnet is connected to the two metal strips; when the connecting plate moves to the position of the No. 1 plate, the two metal contacts are in contact with the two metal strips respectively. At this time, if the two conductive rods are submerged in water, the control circuit of the No. 1 electromagnet is connected, and the No. 1 electromagnet is energized; The extension and retraction of telescopic rod No. 1 is used to adjust the height of the two conductive rods, and then to adjust the degree to which the floating island sinks or tilts, and the expansion of airbag No. 1 takes effect; when telescopic rod No. 1 is shortened to the maximum extent, the metal contact does not contact with plate No. 1 and the metal strip on plate No. 1, and the conductive rod does not play a control role at this time, so that the buoyancy control unit stops working when it is not needed; at this time, spring No. 2 is in place, and the pin does not enter the fitting groove. When telescopic rod No. 1 is extended until the metal contact contacts with plate No. 1, the floating island sinks or tilts, and the airbag No. 1 expands to play a role; when telescopic rod No. 1 is shortened to the maximum extent, the metal contact does not contact with plate No. 1 and the metal strip on plate No. 1, and the conductive rod does not play a control role at this time, so the buoyancy control unit stops working when it is not needed; at this time, spring No. 2 is in place, and the pin does not enter the fitting groove. When the metal strip is in the water, plate No. 1 is squeezed, spring No. 2 is compressed, and the pin enters the matching groove. When the conductive rod is submerged in water, electromagnet No. 1 is energized, the piston block enters the matching groove, the pin is inserted into the slot, spring No. 3 contracts first and then resets, and the pin plays a role in fixing the piston block. When airbag No. 1 needs to be reset and buoyancy removed, telescopic rod No. 1 is retracted to the shortest, plate No. 1 is reset, and the pin is pulled out. Under the action of spring No. 1, the piston block is reset and airbag No. 1 is contracted, so airbag No. 1 is reset and the buoyancy control unit is reset.

[0009] Preferably, elastic membranes are fixedly provided between the upper and lower ends of the connecting plate and the long slot; The elastic membrane may be a rubber membrane or a shutter membrane, which is used to prevent water and impurities from entering the interior of the control block through the long groove.

[0010] Preferably, the end of the latch pin close to the engagement groove is provided with an inclined surface; The setting of the inclined surface is shown in the figure, which is similar to a lock tongue. When the piston block moves downward, the latch pin can be smoothly squeezed and enter the slot, preventing the piston block from moving upward and playing a fixing role smoothly.

[0011] The beneficial effects of the present invention are as follows: 1. The artificial floating island for common terns to nest in the present invention comprises a plurality of buoyancy control units evenly arranged around a foam board, each of which is provided with a No. 1 airbag, and each of which changes the buoyancy of the foam board by changing whether the No. 1 airbag is inflated, thereby changing the draft of the floating island and adjusting the inclination of the floating island, thereby reducing the risk of the floating island sinking and tilting.

[0012] 2. The artificial floating island for common terns to nest in described in the present invention, when the floating island sinks or tilts, all or part of the two conductive rods on the buoyancy control unit are immersed in water, then the No. 1 electromagnet on the corresponding buoyancy control unit is energized, the piston block moves away from the No. 1 electromagnet, and the air in the No. 1 cylinder is pressed into the No. 1 airbag, and the corresponding No. 1 airbag expands to increase the buoyancy, thereby increasing the buoyancy of the part where the foam board is connected to the corresponding buoyancy control unit and is lifted, thereby causing the floating island to move up or improve the inclination. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described below in conjunction with the accompanying drawings.

[0014] Figure 1 The present invention is a three-dimensional Figure 1 ; Figure 2 The present invention is a three-dimensional Figure 2 ; Figure 3 is a top view of the present invention; Figure 4 is a three-dimensional diagram of a buoyancy control unit of the present invention; Figure 5 is a partial stereogram of the buoyancy control unit of the present invention; Figure 6 is a cross-sectional view of a buoyancy control unit of the present invention; Figure 7 yes Figure 6 A local enlarged view of point A; In the figure: 1. Foam board; 11. Bamboo pole; 12. Round groove; 2. Buoyancy control unit; 21. No. 1 airbag; 22. Base; 23. Fitting groove; 24. No. 1 cylinder; 25. No. 1 electromagnet; 26. No. 1 spring; 27. Piston block; 28. No. 1 tube; 3. Control block; 31. Insulating plate; 32. Conductive rod; 4. No. 1 cavity; 41. No. 1 telescopic rod; 42. Connecting plate; 43. Long groove; 5. Step groove; 51. No. 1 plate; 52. No. 2 spring; 53. No. 1 block; 54. No. 3 spring; 55. Pin; 56. Slot; 57. Metal contact; 6. Elastic membrane. DETAILED DESCRIPTION

[0015] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0016] like Figure 1 , Figure 2 , Figure 3 As shown, an artificial floating island for common terns to build nests according to the present invention comprises: a foam board 1, a bamboo pole 11 is fixedly connected to the bottom of the foam board 1, and round grooves 12 are provided on the bamboo pole 11 and located at the four corners of the foam board 1; the artificial floating island for common terns to build nests also comprises: a buoyancy control unit 2, a plurality of buoyancy control units 2 are evenly arranged around the foam board 1, each buoyancy control unit 2 is provided with a No. 1 airbag 21, and each buoyancy control unit 2 changes the buoyancy of the foam board 1 by changing whether the No. 1 airbag 21 is expanded or not, thereby changing the draft of the floating island and adjusting the inclination of the floating island; During operation, in the process of using the artificial floating island, due to rain, landing of terns, breeding of terns and other reasons, the load of the artificial floating island may increase, which may lead to the sinking of the artificial floating island and the increase of the draft depth, affecting the use effect of the artificial floating island, and in severe cases, the artificial floating island may sink; and the terns are very likely to be unevenly distributed on the floating island, which may cause the floating island to tilt, and in severe cases, it may also cause the floating island to sink; therefore, a number of buoyancy control units 2 are evenly arranged around the foam board 1, and each buoyancy control unit 2 is provided with a No. 1 airbag 21. Each buoyancy control unit 2 changes the buoyancy of the foam board 1 by changing whether the No. 1 airbag 21 is expanded or not, thereby changing the draft depth of the floating island and adjusting the inclination of the floating island; reducing the risk of sinking and tilting of the floating island; In the present application, bamboo poles 11 from sea drift garbage are used as the framework of the platform, and foam boards 1 are used as the main body to build a floating platform; it is mainly aimed at birds such as sandpipers, black-headed gulls and common terns; because these birds usually breed in clusters during the breeding season, the required breeding habitat area is large, and the size of the floating island is designed to be 10m in length and width. The foam boards 1 made of lightweight and water-resistant materials are spliced. The color of the foam boards 1 (1m*1m*20cm) is selected to be dark brown close to the soil. There is a gap in the middle of the foam boards 1 to facilitate drainage; the bottom framework is built with bamboo poles 11, and a 5m*5m floating island is built first. Six 6m-long bamboo poles 11 (if not enough, they can be spliced) and two 5m-long bamboo poles are used at the bottom. The foam board 1 is connected with a pole 11, and non-woven fabric is covered on the foam board 1. In order to prevent soil loss, reed bundles or bamboo pieces are tied around the upper layer of the foam board 1 as baffles; in order to ensure the stability of the floating island, four circular grooves 12 with a hole diameter of 7 cm are reserved on the bamboo poles around, and are fixed by inserting smooth bamboo poles 11 (with a diameter of 6 cm). The length of each bamboo pole 11 is 3.5 m, and the length inserted into the ground is 1 m, so that the foam board 1 can slide up and down with the water level without shifting left and right; for the reverse-billed sandpiper and common tern, 10 cm of bare soil is laid on the upper layer of the non-woven fabric; for the black-headed gull, 10 cm of soil is laid on the upper layer of the non-woven fabric and Suaeda salsa is transplanted; specimens of Charadriiformes birds can be placed on the floating island to attract birds to nest on the floating island.

[0017] As a specific embodiment of the present invention, Figure 1 , Figure 4 , Figure 6 As shown, the buoyancy control unit 2 includes: a base 22, the side wall of the foam board 1 is fixedly connected with the base 22, the bottom of the base 22 is provided with a cavity, the interior of the cavity is fixedly connected with a No. 1 airbag 21, and the top of the base 22 is provided with a No. 1 tube 24, the top of the base 22 and the surrounding of the fitting groove 23 are fixedly connected with a No. 1 tube 24, the inner top of the No. 1 tube 24 is fixedly connected with a No. 1 electromagnet 25, the bottom of the No. 1 electromagnet 25 is fixedly connected with a No. 1 spring 26, the other end of the No. 1 spring 26 is fixedly connected with a piston block 27, the interior of the piston block 27 is provided with a permanent magnet, the piston block 27 is slidably connected with the interior of the No. 1 tube 24, when the No. 1 electromagnet 25 is energized, the piston block 27 is away from the No. 1 electromagnet 25, the interior of the base 22 is fixedly connected with a No. 1 tube 28, the No. 1 tube 28 connects the interior of the No. 1 tube 24 with the interior of the No. 1 airbag 21; like Figure 4 As shown, a control block 3 is fixedly connected to one side of the base 22, and an insulating plate 31 is provided on the side wall of the control block 3. Two conductive rods 32 are fixedly provided on the insulating plate 31. When the two conductive rods 32 are immersed in water, the first electromagnet 25 is energized; During operation, when the floating island sinks or tilts, all or part of the two conductive rods 32 on the buoyancy control unit 2 are submerged in the water, and the corresponding electromagnet 25 on the buoyancy control unit 2 is energized, and the piston block 27 moves away from the electromagnet 25, pressing the air in the cylinder 24 into the airbag 21, and the corresponding airbag 21 expands to increase the buoyancy, thereby increasing the buoyancy of the part where the foam board 1 is connected to the corresponding buoyancy control unit 2 and is lifted, thereby causing the floating island to move up or improve the inclination.

[0018] As a specific embodiment of the present invention, Figure 6 , Figure 7 As shown, a cavity No. 1 4 is provided inside the control block 3, a telescopic rod No. 1 41 is fixedly connected to the top of the cavity No. 1 4, a connecting plate 42 is fixedly connected to the bottom of the telescopic rod No. 1 41, a long groove 43 is provided on the side wall of the control block 3, and the connecting plate 42 passes through the long groove 43 and is fixedly connected to the insulating plate 31; like Figure 5 , Figure 7 As shown, a stepped groove 5 is provided inside the control block 3 and near the No. 1 tube 24, and the stepped groove 5 is adjacent to the No. 1 cavity 4; a No. 1 plate 51 is slidably connected in the stepped groove 5, and a No. 2 spring 52 is fixedly connected between the No. 1 plate 51 and the end of the stepped groove 5, and a No. 1 block 53 is fixedly connected to the side of the No. 1 tube 24 at the top of the No. 1 plate 51, and a No. 3 spring 54 is fixedly connected to the other end of the No. 1 block 53, and a No. 3 spring 54 is fixedly connected to the other end of the No. 3 spring 54. A latch 55 is fixedly connected to the other end of the No. 3 spring 54; a slot 56 is provided at the side wall of the piston block 27 corresponding to the latch 55, and the latch 55 penetrates the control block 3 and the side wall of the base 22 to enter the engagement The connecting plate 42 is connected to the step groove 5 and inserted into the slot 56; two metal contacts 57 are fixedly connected to the side of the connecting plate 42 facing the step groove 5, and the two metal contacts 57 are electrically connected to the two conductive rods 32 respectively. Two metal strips are fixedly arranged at the positions corresponding to the two metal contacts 57 on the No. 1 plate 51; the control circuit of the No. 1 electromagnet 25 is connected to the two metal strips; when the connecting plate 42 moves to the position of the No. 1 plate 51, the two metal contacts 57 are in contact with the two metal strips respectively. At this time, if the two conductive rods 32 are submerged in water, the control circuit of the No. 1 electromagnet 25 is connected, and the No. 1 electromagnet 25 is energized; During operation, the extension and retraction of the No. 1 telescopic rod 41 is used to adjust the height of the two conductive rods 32, and then to adjust the degree to which the floating island sinks or tilts, and the No. 1 airbag 21 expands to play a role; when the No. 1 telescopic rod 41 is shortened to the maximum extent, the metal contact 57 does not contact the No. 1 plate 51 and the metal strip on the No. 1 plate 51, and the conductive rod 32 does not play a control role at this time, so that the buoyancy control unit 2 stops working when it is not needed; at this time, the No. 2 spring 52 is in place, and the pin 55 does not enter the fitting groove 23. When the No. 1 telescopic rod 41 is extended to the extent that the metal contact 57 contacts the metal strip on the No. 1 plate 51, The No. 1 plate 51 is squeezed, the No. 2 spring 52 is compressed, and the pin 55 enters the fitting groove 23. When the conductive rod 32 is immersed in the water, the No. 1 electromagnet 25 is energized, the piston block 27 enters the fitting groove 23, the pin 55 is inserted into the slot 56, and the No. 3 spring 54 contracts first and then resets, and the pin 55 plays a role in fixing the piston block 27; when the No. 1 airbag 21 needs to be reset and the buoyancy is removed, the No. 1 telescopic rod 41 is contracted to the shortest, the No. 1 plate 51 is reset, the pin 55 is pulled out, and under the action of the No. 1 spring 26, the piston block 27 is reset, and the No. 1 airbag 21 contracts, so the No. 1 airbag 21 is reset and the buoyancy control unit 2 is reset.

[0019] As a specific embodiment of the present invention, Figure 4 , Figure 7 As shown, elastic membranes 6 are fixedly provided between the upper and lower ends of the connecting plate 42 and the long slot 43; During operation, the elastic membrane 6 may be a rubber membrane or a shutter membrane, so as to prevent water and impurities from entering into the control block 3 through the long groove 43 .

[0020] As a specific embodiment of the present invention, Figure 7 As shown, the end of the latch 55 close to the engagement groove 23 is provided with an inclined surface; During operation, the inclined surface is arranged as shown in the figure, similar to a locking tongue. When the piston block 27 moves downward, the latch pin 55 can be smoothly squeezed and enter the slot 56, preventing the piston block 27 from moving upward, thus smoothly playing a fixing role.

[0021] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the specific implementation modes of the present invention can still be modified or replaced by equivalents, and any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. An artificial floating island for common terns to nest, comprising: A foam board (1), wherein a bamboo pole (11) is fixedly connected to the bottom of the foam board (1), and circular grooves (12) are formed on the bamboo pole (11) and located at the four corners of the foam board (1); Characterized in that: the artificial floating island for common terns to build nests also includes: A buoyancy control unit (2), wherein a plurality of buoyancy control units (2) are evenly arranged around the foam board (1), each of the buoyancy control units (2) is provided with a No. 1 airbag (21), and each of the buoyancy control units (2) changes the buoyancy of the foam board (1) by changing whether the No. 1 airbag (21) is expanded or not, thereby changing the draft of the floating island and adjusting the inclination of the floating island.

2. An artificial floating island for common tern nesting according to claim 1, characterized in that: The buoyancy control unit (2) comprises: A base (22), the side wall of the foam board (1) is fixedly connected to the base (22), a cavity is provided at the bottom of the base (22), a first airbag (21) is fixedly connected inside the cavity, and a fitting groove (23) is provided at the top of the base (22); A No. 1 cylinder (24), the top of the base (22) and the surrounding of the fitting groove (23) are fixedly connected with a No. 1 cylinder (24), the inner top of the No. 1 cylinder (24) is fixedly connected with a No. 1 electromagnet (25), the bottom of the No. 1 electromagnet (25) is fixedly connected with a No. 1 spring (26), the other end of the No. 1 spring (26) is fixedly connected with a piston block (27), the interior of the piston block (27) is provided with a permanent magnet, the piston block (27) is slidably connected with the interior of the No. 1 cylinder (24), when the No. 1 electromagnet (25) is energized, the piston block (27) is away from the No. 1 electromagnet (25), the interior of the base (22) is fixedly connected with a No. 1 tube (28), the No. 1 tube (28) connects the interior of the No. 1 cylinder (24) with the interior of the No. 1 airbag (21).

3. An artificial floating island for common tern nesting according to claim 2, characterized in that: A control block (3) is fixedly connected to one side of the base (22), an insulating plate (31) is provided on the side wall of the control block (3), two conductive rods (32) are fixedly provided on the insulating plate (31), and when the two conductive rods (32) are immersed in water, the first electromagnet (25) is energized.

4. The artificial floating island for common tern nesting according to claim 3, characterized in that: A first cavity (4) is provided inside the control block (3); a first telescopic rod (41) is fixedly connected to the top of the first cavity (4); a connecting plate (42) is fixedly connected to the bottom of the first telescopic rod (41); a long groove (43) is provided on the side wall of the control block (3); and the connecting plate (42) passes through the long groove (43) and is fixedly connected to the insulating plate (31).

5. The artificial floating island for common tern nesting according to claim 4, characterized in that: A stepped groove (5) is provided inside the control block (3) and near the No. 1 cylinder (24), and the stepped groove (5) is adjacent to the No. 1 cavity (4); a No. 1 plate (51) is slidably connected inside the stepped groove (5), a No. 2 spring (52) is fixedly connected between the No. 1 plate (51) and the end of the stepped groove (5); a No. 1 block (53) is fixedly connected to the top of the No. 1 plate (51) near the No. 1 cylinder (24), a No. 3 spring (54) is fixedly connected to the other end of the No. 1 block (53), and a No. 3 spring (54) is fixedly connected to the other end of the No. 3 spring (54); a slot (56) is provided on the side wall of the piston block (27) at a position corresponding to the latch (55), and the latch (55) passes through the control block (3) and the base (2 2) the side wall can enter the fitting groove (23) and be inserted into the slot (56); two metal contacts (57) are fixedly connected to the side of the connecting plate (42) facing the stepped groove (5), and the two metal contacts (57) are electrically connected to the two conductive rods (32) respectively. Two metal strips are fixedly arranged at the positions corresponding to the two metal contacts (57) on the No. 1 plate (51); the control circuit of the No. 1 electromagnet (25) is connected to the two metal strips; when the connecting plate (42) moves to the position of the No. 1 plate (51), the two metal contacts (57) are in contact with the two metal strips respectively. At this time, if the two conductive rods (32) are immersed in water, the control circuit of the No. 1 electromagnet (25) is connected, and the No. 1 electromagnet (25) is energized.

6. The artificial floating island for common tern nesting according to claim 5, characterized in that: Elastic membranes (6) are fixedly provided between the upper and lower ends of the connecting plate (42) and the long groove (43).

7. An artificial floating island for common tern nesting according to claim 6, characterized in that: The end of the latch pin (55) close to the engaging groove (23) is provided with an inclined surface.

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