Underwater lamp

Abstract

The invention provides an underwater lamp and a using method, and belongs to the field of agricultural ecological engineering, the underwater lamp comprises a rechargeable lamp (1), a lamp holder (2), a lampshade (3) and an anchor drill rod (19), the underwater lamp is characterized in that the rechargeable lamp (1) is a rechargeable LED lamp, the lamp holder (2) and the lampshade (3) are made of transparent plastics, and a magnetic cake (10) is made of magnets. The rechargeable lamp (1) is screwed into the lamp holder (2) in a spiral mode, the lamp holder (2) is screwed into the lampshade (3) in a spiral mode, the second discus (12) and the first discus (11) are adjusted according to needs to enable the lampshade (3) to float on the water surface, suspend in the water and sink in the water bottom, the lampshade (3) is placed in the water to provide light at dusk, and the device is used for luring insects and feeding fishes, reducing agricultural insect pests, fishing at night, researching water ecology and the like according to the natural nature that part of winged insects tend to phototaxis at night.

Description

TECHNICAL FIELD

[0001] The present application relates to the ecological field, in particular to the field of agricultural ecological engineering, and more particularly to a water lamp. BACKGROUND

[0002] Plant production is vulnerable to insect pests, in order to kill insects, humans have invented chemical pesticides, but pesticides pollute the environment, destroy the ecological balance, and reduce the quality of food.

[0003] Aquaculture needs to feed feed, in order to profit, humans have invented feed additives, but feed additives also pollute the environment, destroy the ecological balance, and reduce the quality of aquatic products.

[0004] Each species has a unique ecological niche, for example, the fly niche is mainly in the air, and the fish niche is mainly in the water. Fish and fly niches are different, and it is difficult to form a predator-prey relationship between fish and flies in a natural state.

[0005] Each species has a unique nature, for example, some insects have a phototactic nature at night and prefer to be active in the upper half of the night, and some aquatic animals also have a phototactic nature at night. The road lamp is often surrounded by various flies in the summer night, some of which are pests, and some of which eat about ten times their body weight of food in their life history. For example, black fish naturally like to prey on small animals, and frogs naturally like to prey on mouth jumping insects or flies.

[0006] Many types of flies feed on food and vegetables, and are pests. Humans have synthesized tens of thousands of chemicals for agriculture, such as using chemical pesticides to kill insects and adding feed additives to feed fish. Most of these chemicals pollute the agricultural environment, destroy the ecological balance, and are not conducive to food health, and the disadvantages are greater than the advantages. Organic agriculture advocates the prohibition of the use of artificially synthesized chemicals, including chemical pesticides, feed additives, etc., but it is a difficult problem to control insect pests in the development of organic agriculture.

[0007] In a natural state, aquatic animals also eat flies, but it is rare and inefficient, and if the efficiency of aquatic animals eating flies can be improved, it will be beneficial to control insect pests in planting and also beneficial to enrich the food sources of aquaculture animals. In order to build a fish-eating fly food chain, existing technology can catch insects, kill insects, and feed, but the insect catching technology, insect killing technology, and feeding technology require too much equipment cost, technology cost, labor cost, environmental cost, and quality cost, resulting in a loss of benefit. In order to realize fish eating flies, the existing technology has the defects of long path, low efficiency, large pollution, high cost, and poor effect. SUMMARY

[0008] In order to overcome the above-mentioned deficiencies of the prior art, the present application provides a water lamp for improving the efficiency of aquatic animals and amphibians eating flying insects, which can also be used for studying the influence of night light on aquatic organisms, and other purposes such as night fishing, light trapping, water environment investigation, night aquatic ecological environment research, etc.

[0009] The application adopts the technical scheme that a water lamp comprises a charging lamp (1), a lamp holder (2), a lampshade (3) and an anchor bolt (19), characterized in that the charging lamp (1) is provided with a switch (4), a charging socket (5), external teeth (6), a bulb (7) and a storage battery (8), the charging lamp (1) is a light emitting diode (LED lamp), the cross section of the charging lamp (1) is circular, the switch (4) and the charging socket (5) are arranged at the bottom of the charging lamp (1), the lamp holder (2) is provided with internal teeth (9), a magnetic cake (10), a first iron cake (11), a second iron cake (12), an air hole (13) and an external thread (14), the cross sections of the lamp holder (2), the magnetic cake (10), the first iron cake (11) and the second iron cake (12) are circular, the magnetic cake (10) is fixedly arranged in a circular upward convex platform at the bottom of the lamp holder (2), the first iron cake (11) and the second iron cake (12) are adsorbed in a circular groove at the bottom of the lamp holder (2) by the magnetic attraction of the magnetic cake (10), the cross sections of the magnetic cake (10), the first iron cake (11) and the second iron cake (12) are circular, the air hole (13) is arranged at the bottom of the external thread (14), the cross section of the lampshade (3) is circular, the lampshade (3) is provided with an internal thread (15), a cable tie (16), a first clasp ring (17), a leather ring (18) and a second clasp ring (23), one end of a rope (22) is tied to the first clasp ring (17) and the other end is tied to an anchor hole (20), the anchor hole (20) arranged in the middle of the anchor bolt (19) is a circular hole, a hand ring (21) arranged at the top of the anchor bolt (19) is a circular hole, the bottom of the anchor bolt (19) is a sharp triangle, the longitudinal section of the cable tie (16) is a circular rectangle, the cross section of the cable tie (16) is a circular ring, the longitudinal section of the leather ring (18) is circular, the cross section of the leather ring (18) is a circular ring, the external teeth (6) and the internal teeth (9) are connected in a spiral tight engagement mode, the external thread (14) and the internal thread (15) are connected in a spiral tight engagement mode, the cable tie (16) is tightly wound on the outside of the bottom cylindrical surface of the lampshade (3), the first clasp ring (17) and the second clasp ring (23) are symmetrically welded on the virtual circular ring diameter of the cable tie (16), the lamp holder (2) and the lampshade (3) are made of transparent plastic poly (methyl methacrylate (PMMA), the magnetic cake (10) is made of a magnet, the first iron cake (11) and the second iron cake (12) are iron surfaces sprayed with anti-rust paint, the cable tie (16), the first clasp ring (17) and the second clasp ring (23) are made of stainless steel, the leather ring (18) is made of elastic rubber, the anchor bolt (19) is made of stainless steel, the rope (22) is made of nylon, the inside of the hand ring (21) is iron, the surface of the hand ring (21) is plasticized,The sum of the mass of the charging lamp (1) plus the mass of the lamp holder (2) plus the mass of the lamp shade (3) minus the mass of the second iron disc (12) divided by the sum of the volume of the lamp shade (3) and the volume of the base cylinder of the lamp holder (2) is equal to the density of pure water. The use method is as follows: charge the charging lamp (1), press the switch (4) to light the bulb (7), screw the charging lamp (1) into the lamp holder (2), screw the lamp holder (2) into the lamp shade (3), tie one end of the rope (22) to the first grommet (17) and the other end to the anchor hole (20), insert the anchor (19) into the water, remove the second iron disc (12) and the first iron disc (11) if the lamp shade (3) needs to float on the water surface, remove only the second iron disc (12) and keep the first iron disc (11) if the lamp shade (3) needs to be suspended in the water, keep both the second iron disc (12) and the first iron disc (11) if the lamp shade (3) needs to sink to the bottom of the water, and put the lamp shade (3) in the water in the evening to provide underwater lighting.

[0010] The names and purposes of each component are as follows:

[0011] The charging lamp (1) is used to provide light to attract flying insects in the air, attract phototactic animals in the water, provide underwater lighting, charge energy storage, etc.

[0012] The lamp holder (2) is used to fix the relative position of the charging lamp (1) and the lamp shade (3).

[0013] The lamp shade (3) is used to protect the charging lamp (1) from water immersion and provide buoyancy.

[0014] The switch (4) is used to control the opening and closing of the charging lamp (1) circuit.

[0015] The charging socket (5) is used to charge the charging lamp (1).

[0016] The external teeth (6) are used to fix the lamp holder (2) and connect the internal teeth (9).

[0017] The bulb (7) is used to provide light.

[0018] The battery (8) is used for energy storage and power supply.

[0019] The internal teeth (9) fix the lamp holder (2) and connect the external teeth (6).

[0020] The magnetic disc (10) is used to provide gravity and lower the center of gravity.

[0021] The first iron disc (11) is used to adjust the gravity.

[0022] The second iron disc (12) is used to adjust the gravity.

[0023] The air hole (13) is used to adjust air pressure during the process of screwing the lamp holder (2) into and out of the lamp shade (3).

[0024] The outer wire (14) is used for fixing the lamp holder (2) and connecting the inner wire (15);

[0025] The inner wire (15) is used for fixing the lamp holder (2) and connecting the outer wire (14);

[0026] The cable tie (16) is used for providing a force point for the first grommet (17) and the second grommet (23);

[0027] The first grommet (17) is used for providing a force point for the lampshade (3) and facilitating the connection of the rope (22) between the mooring and the anchor (19);

[0028] The leather ring (18) is used for sealing the gap between the lamp holder (2) and the lampshade (3);

[0029] The anchor (19) is used for providing a force point for the rope (22) on the water body shore;

[0030] The anchor hole (20) is used for tying the rope (22);

[0031] The hand ring (21) is used for facilitating the hand force when the anchor (19) is inserted into the water body shore and pulled out;

[0032] The rope (22) is used for connecting the anchor (19) and the lampshade (3);

[0033] The second grommet (23) is used for providing a force point for winding and anchoring the lampshade (3).

[0034] Rice is the main food, and there are often ponds, lakes, water bubbles, pool weirs, rivers and ditches near the rice planting area. According to the Linde Mann law, pests need to obtain ten times energy from food, and it is too difficult to rely on mechanical trapping to control pests, and there are too many disadvantages of relying on chemical pesticides. It is difficult for black fish in water to eat flying insects under the street lamp, and the use of the application can improve the efficiency of black fish eating flying insects. Black fish, eels and frogs have the nature of catching small animals. There are many insects in the paddy field, but few insects in the pond. The phototaxis of part of flying insects is used to attract flying insects in the paddy field to the pond, so as to reduce the harm of pests and improve the food source of aquatic animals.

[0035] The influence of providing light in the aquatic environment at night on aquatic organisms has not been thoroughly studied, and the specific influence of light on each aquatic organism is still lacking sufficient research reports. Therefore, the application can be used for studying the influence of night light on aquatic organisms.

[0036] The light is insufficient at the bottom of the water at night, and the fish's vision is affected due to too dark light at night. The application can provide light at the bottom of the water at night to assist fishing. Phototactic flying insects have the nature of hovering around electric lamps, and the light of the application is located below the water surface when floating on the water surface, which shortens the distance between flying insects and the water surface, thereby providing convenience for aquatic animals and amphibians to catch insects.

[0037] The magnetic cake (10) and the first iron cake (11) and the second iron cake (12) can significantly reduce the gravity center, avoid the overturning and excessive shaking of the lampshade (3). The first iron cake (11) and the second iron cake (12) can be used to coarsely adjust the weight to three states of floating, suspending and sinking, and the spiral between the outer thread (14) and the inner thread (15) can be used to finely adjust the volume, and the water is not leaked due to the surface tension.

[0038] The beneficial effects of the present application are:

[0039] ①The flying insects are attracted to the vicinity of the water surface bulb, which is convenient for being preyed on by aquatic animals such as black fish and frogs;

[0040] ②The phototactic animals are attracted to the vicinity of the bulb, which is convenient for being preyed on by carnivorous fish;

[0041] ③The harm of chemical substances such as pesticides and feed additives is eliminated;

[0042] ④It is rechargeable, sustainable, safe, simple, waterproof, labor-saving and feed-saving;

[0043] ⑤It is environmentally friendly, ecological and energy-saving;

[0044] ⑥It reduces the harm of pests and improves fish production;

[0045] ⑦It can be used for night fishing;

[0046] ⑧It can be used for night water body light trapping;

[0047] ⑨It can be used for water environment investigation and night aquatic ecological environment research;

[0048] According to the needs, the water surface floating lamp, the water suspended lamp and the water bottom lighting lamp can be obtained, the method is that: only the first iron cake (11) is removed to make the lampshade (3) suspended in the water, the second iron cake (12) and the first iron cake (11) are removed to make the lampshade (3) float on the water surface, and the second iron cake (12) and the first iron cake (11) are retained to make the lampshade (3) sink to the water bottom. BRIEF DESCRIPTION OF DRAWINGS

[0049] The present application will be further described below in combination with the drawings and examples.

[0050] Figure 1 It is a schematic diagram of the overall axial cross-sectional structure of some embodiments of the present application;

[0051] Figure 2 It is a schematic diagram of the axial cross-sectional structure of the charging lamp (1) of some embodiments of the present application;

[0052] Figure 3 It is a schematic diagram of the bottom structure of the charging lamp (1) of some embodiments of the present application;

[0053] Figure 4 Fig. 1 is a schematic diagram of the cross-sectional structure of the axis of the lamp holder (2) of some embodiments of the present application;

[0054] Figure 5 Fig. 2 is a schematic diagram of the cross-sectional structure of the axis of the lamp cover (3) of some embodiments of the present application;

[0055] In the figure, 1. charging lamp, 2. lamp holder, 3. lamp cover, 4. switch, 5. charging socket, 6. outer teeth, 7. bulb, 8. battery, 9. inner teeth, 10. magnetic cake, 11. first iron cake, 12. second iron cake, 13. air hole, 14. outer thread, 15. inner thread, 16. ribbon, 17. first ring, 18. leather ring, 19. anchor, 20. anchor hole, 21. hand ring, 22. rope, 23. second ring. DETAILED DESCRIPTION

[0056] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments.

[0057] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "cross section", "longitudinal section", "bottom", "middle", "top", "upper edge", "virtual diameter ends" and the like are based on the parallel plane of the line of sight of the observer facing the described orientations or positional relationships of the present application in the case of virtual installation of the present application, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the indicated devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0058] It should also be understood that the gaps between the outer teeth (6) and the inner teeth (9) and the gaps between the outer thread (14) and the inner thread (15) in the figure are only for the convenience of distinguishing, identifying and understanding the positional relationships and connection relationships, and cannot be understood as reserving gaps of corresponding proportions, and cannot limit the positional relationships and connection relationships of other embodiments of the present application. The illustrated rope (22) should be understood as a connection relationship and a positional relationship, and the length of the illustrated rope (22) cannot be understood and limited as the length actually required by the present application, and a rope (22) of reasonable length belongs to the protection scope of the present application.

[0059] Then it needs to be understood that the gap between the first ring (17) and the strap (16) is illustrated, the gap between the second ring (23) and the strap (16) should be understood as the position relationship and connection relationship for convenient description, the gap between the second iron disc (12) and the first iron disc (11) is illustrated, and the gap between the first iron disc (11) and the magnetic disc (10) is only for convenient description, distinction, identification and understanding of the position relationship and connection relationship, and cannot be understood as reserving the corresponding proportion of the gap, and cannot limit the position relationship and connection relationship of other embodiments of the application. The illustration of other gaps is only for convenient description, distinction, identification and understanding of the position relationship and connection relationship, and cannot be understood as a limitation of the application.

[0060] It also needs to be understood that the first iron disc (11) and the second iron disc (12) have the same mass appearance, so that the first iron disc (11) is named as being closely attached to the magnetic disc (10) after virtual installation, which is only for convenient description, and therefore cannot be understood as a limitation of the application.

[0061] In the description of the application, the shapes, structures, sizes, materials and the like of the components which are not specifically and in detail described are adopted by the commonly used standard specifications, for example, the purpose of setting the air hole (13) is to ventilate during installation and disassembly, so that the shape is circular and the size is not limited. Other technical details are executed according to the commonly known industry standard.

[0062]

Embodiment One

[0063] A underwater lamp comprises a charging lamp (1), a lamp holder (2), a lampshade (3), and an anchor rod (19), characterized in that: the charging lamp (1) is provided with a switch (4), a charging socket (5), an external thread (6), a bulb (7), and a battery (8); the charging lamp (1) is a light emitting diode (LED); the cross section of the charging lamp (1) is circular; the switch (4) and the charging socket (5) are arranged at the bottom of the charging lamp (1); the lamp holder (2) is provided with an internal thread (9), a magnetic disc (10), a first discus (11), a second discus (12), an air hole (13), and an external wire (14); the cross sections of the lamp holder (2), the magnetic disc (10), the first discus (11), and the second discus (12) are circular; the magnetic disc (10) is fixedly sealed at the bottom of the lamp holder (2) and faces upward. In the circular raised platform, the first discus (11) and the second discus (12) are adsorbed in the circular groove at the bottom of the lamp holder (2) by the magnetic attraction of the magnetic disc (10); the cross sections of the magnetic disc (10), the first discus (11) and the second discus (12) are circular; the air hole (13) is arranged at the bottom of the outer wire (14); the cross section of the lampshade (3) is circular; the lampshade (3) is provided with an inner wire (15), a tie (16), a first bolt ring (17), a leather ring (18), a second The bolt ring (23) is provided, one end of the rope (22) is tied to the first bolt ring (17), and the other end is tied to the anchor hole (20). The anchor hole (20) provided in the middle of the anchor rod (19) is a circular hole. The hand ring (21) provided on the top of the anchor rod (19) is a circular hole. The bottom of the anchor rod (19) is a sharp triangle. The longitudinal section of the cable tie (16) is a rounded rectangle. The cross section of the cable tie (16) is a circular ring. The longitudinal section of the leather ring (18) is a circular ring. The cross section of the leather ring (18) is a circular ring. The outer teeth (6) and the inner teeth (9) are connected by a spiral tight bite mode, the outer wire (14) and the inner wire (15) are connected by a spiral tight bite mode, the tie (16) is tightly wrapped around the outer side of the cylindrical upper edge of the bottom of the lampshade (3), the first bolt ring (17) and the second bolt ring (23) are axially symmetrically welded at both ends of the diameter of the virtual ring of the tie (16), the lamp holder (2) and the lampshade (3) are made of transparent plastic polymethyl methacrylate (Poly(methyl methacrylate) The magnetic disc (10) is made of a magnet, the first discus (11) and the second discus (12) are made of iron with anti-rust paint sprayed on the surface, the cable tie (16), the first bolt ring (17) and the second bolt ring (23) are made of stainless steel, the leather ring (18) is made of elastic rubber, the anchor rod (19) is made of stainless steel, the rope (22) is made of nylon, the inside of the wristband (21) is iron, and the surface of the wristband (21) is plasticized.The sum of the mass of the charging lamp (1) plus the mass of the lamp holder (2) plus the mass of the lamp shade (3) minus the mass of the second iron disc (12) divided by the sum of the volume of the lamp shade (3) and the volume of the base cylinder of the lamp holder (2) is equal to the density of pure water. The method of use is as follows: fully charge the charging lamp (1), press the switch (4) to light the bulb (7), screw the charging lamp (1) into the lamp holder (2), screw the lamp holder (2) into the lamp shade (3), tie one end of the rope (22) to the first grommet (17) and the other end to the anchor hole (20), insert the anchor (19) into the water, remove the second iron disc (12) and the first iron disc (11) if the lamp shade (3) needs to float on the water surface, remove only the second iron disc (12) and keep the first iron disc (11) if the lamp shade (3) needs to be suspended in the water, keep both the second iron disc (12) and the first iron disc (11) if the lamp shade (3) needs to sink to the bottom of the water, place the lamp shade (3) in the water to provide underwater lighting in the evening, the output power of the charging lamp (1) is 4 watts, the voltage is 5 volts, the length of the charging lamp (1) is 146 millimeters, the width is 65 millimeters, the height is 65 millimeters, the height of the lamp holder (2) is 129 millimeters, the diameter of the base cross section is 200 millimeters, the height is 16 millimeters, the diameter of the upper cross section of the lamp holder (2) is 155 millimeters, the diameter of the bottom groove is 80 millimeters, the diameter of the upward circular protruding platform at the bottom is 80 millimeters, the diameter of the magnetic disc (10), the first iron disc (11), and the second iron disc (12) is 60 millimeters, the diameter of the upper spherical part of the lamp shade (3) is 260 millimeters, the height of the lower cylindrical part is 113 millimeters, and the diameter of the cross section is 176 millimeters, the length of the anchor (19) is 114 millimeters, and the length of the rope (22) is 20 meters.

[0064] According to the sphere calculation formula, the spherical cap calculation formula, and the cylinder calculation formula, the volume of the underwater lamp excluding the anchor (19) and the rope (22) is 12023 cubic centimeters. The calculation method is as follows.

[0065] The volume of a sphere = 4 / 3 πR 3

[0066] The volume of a spherical cap = πh2(R-h / 3)

[0067] The volume of a cylinder = πr 2 H

[0068] According to the above formulas, we know that:

[0069] The virtual sphere radius of the lamp shade (3) R1 = 260 millimeters ÷ 2 = 13 centimeters, so the virtual sphere volume of the lamp shade (3) V1 = 4 / 3 × π × 13 centimeters × 13 centimeters × 13 centimeters = 9202.7721 cubic centimeters.

[0070] The radius of the lower virtual cylinder cross section of the lampshade (3) is R2=176mm÷2=8.8cm, the height H1=113mm=11.3cm, so the volume of the lower virtual cylinder V2=π×8.8cm×8.8cm×11.3cm=2749.1198cm3.

[0071] The radius of the virtual cylinder cross section of the base of the lamp holder (2) is R3=200mm+2=10cm, the height H2=16mm=1.6cm, so the volume of the virtual cylinder V3=π×10cm×10cm×1.6cm=502.6548cm3.

[0072] In the calculation formula of the virtual cut-off spherical cap of the lamp holder (2) on the lampshade (3), the radius of the sphere is R1=260mm+2=13cm, and the height of the spherical cap is h=3.4cm, which is measured and calculated by computer drawing a circle and a rectangle, so the volume of the virtual cut-off spherical cap of the lamp holder (2) on the lampshade (3) is V4=π×3.4cm×3.4cm×(13cm-3.4cm÷3)=430.9595cm3.

[0073] The volume of the underwater lamp excluding the anchor spike (19) and the rope (22) is V=V1+V2+V3-V4=9202.7721cm3+2749.1198cm3+502.6548cm3-430.9595cm3=12023.5872cm3≈12023cm3.

Claims

1. An underwater lamp, comprising a charging lamp (1), a lamp holder (2), a lampshade (3), and an anchor rod (19), characterized in that: The charging lamp (1) is provided with a switch (4), a charging socket (5), an outer thread (6), a bulb (7), and a battery (8). The charging lamp (1) is a light emitting diode (LED lamp). The cross section of the charging lamp (1) is circular. The switch (4) and the charging socket (5) are provided at the bottom of the charging lamp (1). The lamp holder (2) is provided with an inner thread (9), a magnetic disc (10), a first discus (11), a second discus (12), an air hole (13), and an outer thread (14). The cross sections of the lamp holder (2), the magnetic disc (10), the first discus (11), and the second discus (12) are circular. The magnetic disc (10) is fixedly sealed at the bottom of the lamp holder (2) and faces upward. In the circular raised platform, the first discus (11) and the second discus (12) are adsorbed in the circular groove at the bottom of the lamp holder (2) by the magnetic attraction of the magnetic disc (10); the cross sections of the magnetic disc (10), the first discus (11) and the second discus (12) are circular; the air hole (13) is arranged at the bottom of the outer wire (14); the cross section of the lampshade (3) is circular; the lampshade (3) is provided with an inner wire (15), a tie (16), a first bolt ring (17), a leather ring (18), a second The bolt ring (23) is provided, one end of the rope (22) is tied to the first bolt ring (17), and the other end is tied to the anchor hole (20). The anchor hole (20) provided in the middle of the anchor rod (19) is a circular hole. The hand ring (21) provided on the top of the anchor rod (19) is a circular hole. The bottom of the anchor rod (19) is a sharp triangle. The longitudinal section of the cable tie (16) is a rounded rectangle. The cross section of the cable tie (16) is a circular ring. The longitudinal section of the leather ring (18) is a circular ring. The cross section of the leather ring (18) is a circular ring. The outer teeth (6) and the inner teeth (9) are connected by a spiral tight bite mode, the outer wire (14) and the inner wire (15) are connected by a spiral tight bite mode, the tie (16) is tightly wrapped around the outer side of the cylindrical upper edge of the bottom of the lampshade (3), the first bolt ring (17) and the second bolt ring (23) are axially symmetrically welded at both ends of the diameter of the virtual ring of the tie (16), the lamp holder (2) and the lampshade (3) are made of transparent plastic polymethyl methacrylate (Poly(methyl methacrylate) The magnetic disc (10) is made of a magnet, the first discus (11) and the second discus (12) are made of iron with anti-rust paint sprayed on the surface, the cable tie (16), the first bolt ring (17) and the second bolt ring (23) are made of stainless steel, the leather ring (18) is made of elastic rubber, the anchor rod (19) is made of stainless steel, the rope (22) is made of nylon, the inside of the wristband (21) is iron, and the surface of the wristband (21) is plasticized.The sum of the mass of the charging lamp (1) plus the mass of the lamp holder (2) plus the mass of the lampshade (3) minus the mass of the second discus (12) divided by the sum of the volume of the lampshade (3) and the volume of the cylindrical base of the lamp holder (2) is equal to the density of pure water. The method of use is as follows: fully charge the charging lamp (1), press the switch (4) to light the bulb (7), screw the charging lamp (1) into the lamp holder (2), screw the lamp holder (2) into the lampshade (3), and tighten the rope. (22) One end is tied to the first bolt ring (17), and the other end is tied to the anchor hole (20), and the anchor rod (19) is inserted tightly at the water's edge. When the lampshade (3) needs to float on the water surface, the second discus (12) and the first discus (11) are removed. When the lampshade (3) needs to be suspended in the water, only the second discus (12) is removed and the first discus (11) is retained. When the lampshade (3) needs to sink to the bottom of the water, both the second discus (12) and the first discus (11) are retained. In the evening, the lampshade (3) is placed in the water to provide underwater light.

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