A low-cost heavy hammer-type low-frequency directional sound source for underwater warning

Abstract

The invention discloses a low-cost underwater warning heavy hammer knocking low-frequency directional sound source, which belongs to the field of underwater warning devices. The invention discloses a low-cost underwater warning heavy hammer knocking low-frequency directional sound source. The sound source of the scheme generates low-frequency directional sound waves by knocking a vibrating diaphragm with an electric excitation hammer head. The electric excitation adopts a supercapacitor hybrid power supply pulse high-voltage discharge method to excite the hammer head to knock the vibrating diaphragm back and forth in the middle of a POM slideway. A return spring and a buffer are arranged behind the hammer head to help the hammer head to do reciprocating motion. An internal anechoic layer is arranged inside the device shell to eliminate sound waves in other directions. The device is then combined with nitrogen pressure automatic compensation and a pressure regulator to stabilize the sound wave frequency and waveform. Due to the internal pressure compensation capability, the sound energy is directly propagated from the external seawater in a direction, the sound frequency is low, the energy consumption is low, and the propagation efficiency is high. The whole device is fixed to the bottom of the water by a base bracket, the structure is simple, and it has obvious application advantages.

Description

Technical Field

[0001] The invention relates to the field of underwater warning devices, and more specifically to a low-cost heavy hammer striking low-frequency directional sound source for underwater warning. Background Art

[0002] So far, sound waves are considered to be the only information carrier that can propagate over long distances in the ocean. The lower the frequency of the sound wave, the smaller the energy loss caused by the absorption effect during its propagation, and the farther the sound wave can propagate. Very low frequency sound waves have their unique performance advantages, which makes them have very important application value in the fields of ocean research, resource development, and military. Countries have also invested huge manpower and material resources in the research of very low frequency sound sources, but the development of very low frequency sound sources is relatively slow compared to acoustic emission transducers in other frequency bands. The main reason for this situation is that there are two technical difficulties in the development of very low frequency sound sources: the first technical difficulty is to reduce the operating frequency, and the second technical difficulty is to increase the radiated sound power of the sound source.

[0003] The VLF sound sources developed at this stage are mainly divided into three main types: active material driven VLF sound sources, electro-magnetic driven VLF sound sources, and explosive VLF sound sources. The active material driven VLF sound sources mainly use piezoelectric ceramics and rare earth giant magnetostrictive materials as the excitation source of the sound source, and use the liquid cavity structure to reduce the working frequency of the sound source. Typical of this type of sound source are very low frequency Helmholtz sound sources, bending vibration very low frequency sound sources, rare earth giant magnetostrictive overflow ring very low frequency sound sources, etc. Electro-magnetic very low frequency sound sources mainly use the interaction between electric fields and magnetic fields to generate driving force to push the radiation surface Radiating very low frequency sound waves, electro-magnetic very low frequency sound sources are mainly divided into two categories: the first category is electric very low frequency sound source; the second category is electromagnetic very low frequency sound source. The explosive very low frequency sound source is relatively mature, and the most widely used are air guns and plasma sound sources. The air gun very low frequency sound source mainly releases high-pressure compressed air suddenly in the water in a pulsed manner, and uses the high-speed discharged gas to excite the surrounding medium to produce low-frequency vibrations to form the required low-frequency sound waves. The air gun sound source has a simple structure, small size, large acoustic emission power, and 80% of the power is concentrated in the low-frequency band, and the sound source is cost-effective.

[0004] In the prior art, since the radiation resistance of the sound source in the very low frequency band is very small, high-power transmission requires the sound source to have a large vibration volume displacement. In order to achieve the purpose of high-power transmission, the very low frequency sound source designed with active materials currently used has a very large volume and weight. The dynamic and explosive very low frequency sound sources have the problems of low radiation sound power, short emission time, poor continuity, etc. Therefore, designing a very low frequency sound source with a certain radiation sound power, small volume and light weight is a problem that needs to be solved urgently. Summary of the invention

[0005] 1. Technical issues to be solved

[0006] In view of the problems existing in the prior art, the purpose of the present invention is to provide a low-cost heavy hammer-percussion low-frequency directional sound source for underwater warning, which can realize the sound source to generate low-frequency directional sound waves by electrically exciting the hammer head to strike the vibrating diaphragm. The electric excitation adopts a supercapacitor hybrid power supply pulse high-voltage discharge method to excite the hammer head to strike the vibrating diaphragm back and forth in the middle of the POM slideway. A return spring and a buffer are installed behind the hammer head to help the hammer head to reciprocate. An internal sound-absorbing layer is installed inside the device shell to eliminate sound waves in other directions, and then combined with nitrogen pressure automatic compensation and pressure regulator to stabilize the sound wave frequency and waveform. Due to the internal pressure compensation capability, the sound energy is directly propagated from the external seawater in a direction, the sound frequency is low, the energy consumption is low, and the propagation efficiency is high. The whole device is fixed to the bottom of the water by a base bracket, the structure is simple, and it has obvious application advantages.

[0007] 2. Technical solution

[0008] To solve the above problems, the present invention adopts the following technical solutions.

[0009] A low-cost heavy hammer-percussion low-frequency directional sound source for underwater warning, comprising an inner anechoic layer, a symmetrical POM slide fixedly connected in the inner anechoic layer, a vibrating diaphragm fixedly connected to the inner wall of the inner anechoic layer, the vibrating diaphragm located on the right side of the POM slide, a low-frequency sound source fixedly connected to the outer end of the inner anechoic layer, the low-frequency sound source located on the right end of the vibrating diaphragm, a return spring sleeved on the outer end of the POM slide, a buffer fixedly connected to the inner wall of the inner anechoic layer, the buffer located on the left side of the POM slide, a low-frequency sound wave direction is arranged on the outer side of the low-frequency sound source, an electric excitation hammer head fixedly connected to the inner wall of the POM slide, the electric excitation hammer head is located on the right side of the return spring, a discharge coil fixedly connected to the outer end of the POM slide, an energy storage capacitor and a power supply and trigger system fixedly connected to the lower end of the inner anechoic layer, a nitrogen The automatic nitrogen pressure compensation and pressure regulator are connected to the inner anechoic layer. The lower end of the energy storage capacitor and the power supply and trigger system is fixedly connected to the base bracket, which can realize the sound source to generate low-frequency directional sound waves by hitting the vibrating diaphragm through the electric excitation hammer. The electric excitation adopts the supercapacitor mixed power supply pulse high-voltage discharge method to stimulate the hammer to hit the vibrating diaphragm back and forth in the middle of the POM slideway. A return spring and a buffer are installed behind the hammer to help the hammer to reciprocate. The inner anechoic layer is installed inside the device shell to eliminate sound waves in other directions, and then cooperate with the automatic nitrogen pressure compensation and pressure regulator to stabilize the sound wave frequency and waveform. Due to the internal pressure compensation capability, its sound energy is directly propagated from the external seawater in a direction, with low sound frequency, low energy consumption and high propagation efficiency. The whole device is fixed to the bottom of the water by the base bracket, with a simple structure and obvious application advantages.

[0010] Furthermore, two symmetrical main water inlet holes are drilled at the upper end of the base bracket, and the main water inlet holes are located on the outside of the energy storage capacitor and the power supply and trigger system. A hollow plate is slidably connected to the inner wall of the base bracket, and a plurality of deformable balloons are filled in the inner sound-absorbing layer. A plurality of evenly distributed through holes are drilled at the outer end of the deformable balloon, and a water-absorbing sheet is fixedly connected to the inner wall of the through hole. The deformable balloon is filled with expansive soil. Two sets of symmetrical bottom blocks are fixedly connected to the lower end of the base bracket, and an anchor claw is fixedly connected to the lower end of the bottom block. When the base bracket needs to be fixed underwater, the base bracket can be immersed in water so that water enters the base bracket through the main water inlet hole. The bottom bracket is placed in the frame, and water is absorbed through the through holes on the deformation balloon and introduced into the expansion soil, thereby the expansion soil expands. After the expansion of multiple expansion soils, the weight of the bottom bracket becomes heavier, so that the bottom bracket can fall freely. In the falling process, water is continuously introduced. At the same time, the hollow plate rises due to the expansion of the expansion soil, so that the bottom expansion soil can also absorb water and expand to increase the overall weight. After the bottom bracket falls to the bottom of the water, it may be displaced due to the flow of water. The anchor claws can be pulled in the bottom mud and sand to prevent the bottom bracket from deviating too far from the placement position and to ensure that the bottom bracket can remain stable to the greatest extent.

[0011] Furthermore, a pull ring is fixedly connected to the upper end of the inner sound-absorbing layer, and a waterproof layer is coated on the surface of the pull ring. After the inner sound-absorbing layer is placed underwater, a buoy rope can be tied to the pull ring to facilitate the removal of the inner sound-absorbing layer. This makes it more convenient to remove the inner sound-absorbing layer, and the position of the inner sound-absorbing layer moving on the bottom of the water can be monitored.

[0012] Furthermore, two symmetrical secondary water inlet holes are drilled at the outer end of the base bracket, and the secondary water inlet holes are located at the lower side of the main water inlet hole. After the inner sound-absorbing layer automatically descends due to the weight of the base bracket itself, the water inflow into the base bracket can be increased through the secondary water inlet holes, so that the expansive soil in the base bracket can expand efficiently, and after the expansion of the expansive soil, the secondary water inlet holes can be blocked by the rise of the hollow plate, so that the water inflow of the secondary water inlet holes can be controlled.

[0013] Furthermore, a balance block is fixedly connected to the lower end of the base bracket, and the balance block is located between the two groups of anchor claws. After the inner sound-absorbing layer descends due to its own gravity, the balance block can be used to balance the position of the base bracket after it descends, so that after the inner sound-absorbing layer falls to the bottom of the water, it can reach a relatively balanced state through the base bracket and the balance block, thereby better providing operation for the inner sound-absorbing layer.

[0014] Furthermore, the lower end of the balance block is rotatably connected to two symmetrical rotating brackets, and a slot is drilled at the lower end of the balance block. The rotating bracket is inserted into the slot. When the inner anechoic layer is placed into the bottom of the water, it may need to be placed manually due to different environments. When placing it manually, the rotating bracket can be opened so that the rotating bracket can tightly hook the rock surface at the bottom of the water, so that the inner anechoic layer can be placed more quickly and efficiently by manual means.

[0015] Furthermore, a compression pad is fixedly connected to the inner wall of the slot, and the compression pad matches the rotating bracket. When the rotating bracket is inserted into the slot, in order to make the rotating bracket more firmly inserted into the slot, the rotating bracket can be clamped by the compression pad, and the rotating bracket can be protected by the compression pad to prevent it from being damaged easily.

[0016] Furthermore, two symmetrical blocking blocks are fixedly connected to the upper end of the hollow plate, and the blocking blocks match the main water inlet. A leakage hole is drilled at the upper end of the blocking blocks. After the hollow plate is expanded by the expansive soil, it will move upward. After moving upward, in order to inhibit the entry of water flow, the main water inlet can be blocked by the blocking block, and the water intake can be reduced through the leakage hole, so that the expanded expansive soil in the base bracket can continue to absorb water and expand, thereby increasing the stability of the base bracket.

[0017] Furthermore, a weight-increasing block is fixedly connected to the upper end of the hollow plate, and the weight-increasing block is located between the blocking blocks. When the base bracket is fixed, the weight of the base bracket body can be further increased by the weight-increasing block, so that the base bracket is not easily displaced by the flow of water after being fixed.

[0018] 3. Beneficial effects

[0019] Compared with the prior art, the advantages of the present invention are:

[0020] (1) The sound source of this scheme generates low-frequency directional sound waves by striking the vibrating diaphragm with an electrically excited hammer. The electric excitation adopts a supercapacitor hybrid power supply pulse high-voltage discharge method to excite the hammer to strike the vibrating diaphragm back and forth in the middle of the POM slideway. A return spring and a buffer are installed behind the hammer to help the hammer to reciprocate. An internal anechoic layer is installed inside the device shell to eliminate sound waves in other directions. The nitrogen pressure automatic compensation and pressure regulator are then used to stabilize the sound wave frequency and waveform. Due to the internal pressure compensation capability, its sound energy is directly transmitted from the external seawater in a direction, with low sound frequency, low energy consumption and high transmission efficiency. The entire device is fixed to the bottom of the water by a base bracket, with a simple structure and obvious application advantages.

[0021] (2) Two symmetrical main water inlet holes are drilled at the upper end of the base bracket, and the main water inlet holes are located on the outside of the energy storage capacitor and the power supply and trigger system. A hollow plate is slidably connected to the inner wall of the base bracket, and a plurality of deformable balloons are filled in the inner sound-absorbing layer. A plurality of evenly distributed through holes are drilled at the outer end of the deformable balloon, and a water-absorbing sheet is fixedly connected to the inner wall of the through hole. The deformable balloon is filled with expansive soil. Two sets of symmetrical bottom blocks are fixedly connected to the lower end of the base bracket, and anchor claws are fixedly connected to the lower end of the bottom block. When the base bracket needs to be fixed underwater, the base bracket can be immersed in water so that water enters the base bracket through the main water inlet holes and passes through the deformable balloons. The through holes on the bottom absorb water and guide it into the expansive soil, thereby the expansive soil expands. After the expansion of multiple expansive soils, the weight of the base bracket becomes heavier, so that the base bracket can fall freely. In the falling process, water is continuously introduced. At the same time, the hollow plate rises through the expansion of the expansive soil, so that the expansive soil at the bottom can also absorb water and expand to increase the overall weight. After the base bracket falls to the bottom of the water, it may be displaced due to the flow of water. The anchor claws can be pulled in the mud and sand at the bottom of the water to prevent the base bracket from deviating too far from the placement position and to ensure that the base bracket can remain as stable as possible.

[0022] (3) A pull ring is fixedly connected to the upper end of the inner sound-absorbing layer, and a waterproof layer is coated on the surface of the pull ring. After the inner sound-absorbing layer is placed underwater, a buoy rope can be tied to the pull ring to facilitate the removal of the inner sound-absorbing layer. This makes it more convenient to remove the inner sound-absorbing layer, and the position of the inner sound-absorbing layer moving on the bottom of the water can be monitored.

[0023] (4) Two symmetrical auxiliary water inlet holes are drilled at the outer end of the base support, and the auxiliary water inlet holes are located at the lower side of the main water inlet hole. After the inner sound-absorbing layer automatically descends due to the weight of the base support itself, the water inflow into the base support can be increased through the auxiliary water inlet holes, so that the expansive soil in the base support can expand efficiently. After the expansive soil expands, the auxiliary water inlet holes can be blocked by the rise of the hollow plate, so that the water inflow of the auxiliary water inlet holes can be controlled.

[0024] (5) A balance block is fixedly connected to the lower end of the base bracket, and the balance block is located between the two groups of anchor claws. After the inner anechoic layer descends due to its own gravity, the balance block can be used to balance the lowered position of the base bracket, so that after the inner anechoic layer falls to the bottom of the water, it can reach a relatively balanced state through the base bracket and the balance block, thereby providing better operation for the inner anechoic layer.

[0025] (6) The lower end of the balance block is rotatably connected to two symmetrical rotating brackets. A slot is cut at the lower end of the balance block, and the rotating bracket is inserted into the slot. When the inner anechoic layer is placed under water, it may need to be placed manually due to different environments. When placing manually, the rotating bracket can be opened so that the rotating bracket can be tightly hooked on the rock surface at the bottom of the water, so that the inner anechoic layer can be placed more quickly and efficiently by manual means.

[0026] (7) A compression pad is fixedly connected to the inner wall of the card slot, and the compression pad matches the rotating bracket. When the rotating bracket is inserted into the card slot, in order to make the rotating bracket inserted into the card slot more tightly, the rotating bracket can be clamped by the compression pad. At the same time, the rotating bracket can be protected by the compression pad to prevent it from being damaged.

[0027] (8) Two symmetrical blocking blocks are fixedly connected to the upper end of the hollow plate. The blocking blocks match the main water inlet holes. A leakage hole is drilled at the upper end of the blocking blocks. After the hollow plate is expanded by the expansive soil, it will move upward. After moving upward, in order to inhibit the entry of water flow, the main water inlet hole can be blocked by the blocking block. At the same time, the water inflow can be reduced through the leakage hole, so that the expansive soil in the base bracket can continue to absorb water and expand, thereby increasing the stability of the base bracket.

[0028] (9) A weight-increasing block is fixedly connected to the upper end of the hollow plate, and the weight-increasing block is located between the blocking blocks. When the base bracket is fixed, the weight of the base bracket body can be further increased by the weight-increasing block, so that the base bracket is not easily displaced by the flow of water after being fixed. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0030] Figure 2 It is a rear view structural schematic diagram of the present invention;

[0031] Figure 3 It is a cross-sectional structural schematic diagram of the present invention;

[0032] Figure 4 It is a schematic diagram of the seat bottom bracket structure of the present invention;

[0033] Figure 5 It is a schematic diagram of the structure of the deformable balloon of the present invention;

[0034] Figure 6 It is a schematic diagram of the balancing block structure of the present invention.

[0035] Description of the numbers in the figure:

[0036] 1 inner anechoic layer, 101 pull ring, 2POM slide, 3 vibration diaphragm, 4 low-frequency sound source, 5 return spring, 6 buffer, 7 low-frequency sound wave direction, 8 electric excitation hammer, 9 discharge coil, 10 energy storage capacitor and power supply, trigger system, 11 nitrogen pressure automatic compensation and pressure regulator, 12 bottom bracket, 1201 auxiliary water inlet hole, 1202 balance block, 1203 rotating bracket, 1204 slot, 1205 extrusion pad, 13 main water inlet hole, 14 hollow plate, 1401 blocking block, 1402 leakage hole, 1403 weight block, 15 deformation balloon, 16 through hole, 17 water absorbent sheet, 19 expansive soil, 20 bottom block, 21 anchor claw. DETAILED DESCRIPTION

[0037] The following will combine the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all the embodiments. All other embodiments obtained by ordinary technicians in this field without creative work based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0038] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] Example:

[0041] See also Figure 1-4A low-cost heavy hammer striking low-frequency directional sound source for underwater warning, comprising an inner anechoic layer 1, a symmetrical POM slide 2 is fixedly connected in the inner anechoic layer 1, a vibration diaphragm 3 is fixedly connected to the inner wall of the inner anechoic layer 1, and the vibration diaphragm 3 is located on the right side of the POM slide 2, a low-frequency sound source 4 is fixedly connected to the outer end of the inner anechoic layer 1, and the low-frequency sound source 4 is located at the right end of the vibration diaphragm 3, a return spring 5 is sleeved on the outer end of the POM slide 2, a buffer 6 is fixedly connected to the inner wall of the inner anechoic layer 1, and the buffer 6 is located on the left side of the POM slide 2, a low-frequency sound wave direction 7 is arranged on the outer side of the low-frequency sound source 4, an electric excitation hammer 8 is fixedly connected to the inner wall of the POM slide 2, and the electric excitation hammer 8 is located on the right side of the return spring 5, a discharge coil 9 is fixedly connected to the outer end of the POM slide 2, an energy storage capacitor and a power supply and trigger system 10 are fixedly connected to the lower end of the inner anechoic layer 1, and a nitrogen pressure automatic compensation and pressure regulation are fixedly connected to the energy storage capacitor and the power supply and trigger system 10 The regulator 11, the automatic nitrogen pressure compensation and the pressure regulator 11 are connected to the inner anechoic layer 1, and the lower end of the energy storage capacitor and the power supply and trigger system 10 is fixedly connected with a base bracket 12. The present scheme adopts the base bracket 12 to be installed on the bottom of the water. When the energy storage capacitor and the power supply and trigger system 10 start to generate pulse high voltage excitation electric excitation hammer 8 in the discharge coil 9, the electric excitation hammer 8 will make reciprocating motion in the middle of the POM slideway 2 to strike the vibration diaphragm 3 so that the low-frequency sound source 4 generates low-frequency directional sound waves. The sound wave has a single impact energy of 10010000J and a sound intensity of 190 decibels. The return spring 5 and the buffer 6 help the electric excitation hammer 8 to reciprocate. At this time, the inner anechoic layer 1 inside the device is used to eliminate sound waves in other directions, and only retains the sound waves in the low-frequency sound wave direction 7. The automatic nitrogen pressure compensation and the pressure regulator 11 stabilize the frequency and waveform of the sound waves, so that the sound source consumes a small amount of energy to generate low-frequency directional sound waves with high propagation efficiency.

[0042] See also Figure 4-6Two symmetrical main water inlet holes 13 are drilled at the upper end of the bottom bracket 12, and the main water inlet holes 13 are located on the outside of the energy storage capacitor and the power supply and trigger system 10. A hollow plate 14 is slidably connected to the inner wall of the bottom bracket 12. A plurality of deformation balloons 15 are filled in the inner sound-absorbing layer 1. A plurality of evenly distributed through holes 16 are drilled at the outer end of the deformation balloon 15. A water-absorbing sheet 17 is fixedly connected to the inner wall of the through hole 16. The deformation balloon 15 is filled with expansive soil 19. Two sets of symmetrical bottom blocks 20 are fixedly connected at the lower end of the bottom bracket 12. Anchor claws 21 are fixedly connected at the lower end of the bottom block 20. When the bottom bracket 12 needs to be fixed underwater, the bottom bracket 12 can be immersed in water so that water enters the bottom bracket 12 through the main water inlet holes 13, and Water is absorbed through the through holes 16 on the deformation balloon 15 and introduced into the expansive soil 19, thereby the expansive soil 19 expands. After the expansion of multiple expansive soils 19, the weight of the base bracket 12 becomes heavier, so that the base bracket 12 can fall freely. In the falling process, water is continuously introduced. At the same time, the expansion of the expansive soil 19 causes the hollow plate 14 to rise, so that the expansive soil 19 at the bottom can also absorb water and expand to increase the overall weight. After the base bracket 12 falls to the bottom of the water, it may be displaced due to the flow of water. The anchor claws 21 can pull in the bottom mud and sand, so that the base bracket 12 is not easy to deviate too far from the placement position, and the base bracket 12 can still remain as stable as possible.

[0043] See also Figure 1-4, a pull ring 101 is fixedly connected to the upper end of the inner sound-absorbing layer 1, and a waterproof layer is coated on the surface of the pull ring 101. After the inner sound-absorbing layer 1 is placed underwater, in order to facilitate the removal of the inner sound-absorbing layer 1, a buoy rope can be tied to the pull ring 101, so that the inner sound-absorbing layer 1 is more convenient to remove, and the position of the inner sound-absorbing layer 1 moving on the bottom of the water can be monitored. Two symmetrical secondary water inlet holes 1201 are drilled at the outer end of the base bracket 12, and the secondary water inlet holes 1201 are located on the lower side of the main water inlet hole 13. After the inner sound-absorbing layer 1 automatically drops due to the weight of the base bracket 12 itself, the water intake in the base bracket 12 can be increased through the secondary water inlet holes 1201, so that the expansive soil 19 in the base bracket 12 can be efficiently expanded, and after the expansion soil 19 expands, the secondary water inlet hole 1201 can be blocked by the rise of the hollow plate 14, so that the water intake of the secondary water inlet hole 1201 is For control, two symmetrical blocking blocks 1401 are fixedly connected to the upper end of the hollow plate 14, and the blocking blocks 1401 match the main water inlet hole 13. A leakage hole 1402 is drilled on the upper end of the blocking blocks 1401. After the hollow plate 14 is expanded by the expansive soil 19, it will move upward. After moving upward, in order to suppress the entry of water flow, the main water inlet hole 13 can be blocked by the blocking blocks 1401, and at the same time, the water intake can be reduced through the leakage hole 1402, so that the expanded expansive soil 19 in the base bracket 12 can continue to absorb water and expand, thereby increasing the stability of the base bracket 12. A weight-added block 1403 is fixedly connected to the upper end of the hollow plate 14, and the weight-added block 1403 is located between the blocking blocks 1401. After the base bracket 12 is fixed, the weight-added block 1403 can be further increased The weight of the base bracket 12 body is made to be less likely to be offset by the flow of water after the base bracket 12 is fixed.

[0044] See also Figure 6The lower end of the base bracket 12 is fixedly connected with a balance block 1202, and the balance block 1202 is located between the two groups of anchor claws 21. After the inner sound-absorbing layer 1 drops due to its own gravity, the balance block 1202 can be used to balance the lower position of the base bracket 12, so that after the inner sound-absorbing layer 1 falls to the bottom of the water, it can reach a relatively balanced state through the base bracket 12 and the balance block 1202, so as to better provide the inner sound-absorbing layer 1 with operation. The lower end of the balance block 1202 is rotatably connected with two symmetrical rotating brackets 1203, and a slot 1204 is cut at the lower end of the balance block 1202. The rotating bracket 1203 is inserted into the slot 1204. When the inner sound-absorbing layer 1 is placed on the bottom of the water, it may be due to different environments. It may need to be placed manually, and when placed manually, the rotating bracket 1203 can be opened so that the rotating bracket 1203 can be tightly hooked on the rock surface at the bottom of the water, so that the inner sound-absorbing layer 1 can be placed more quickly and efficiently by manual means. An extrusion pad 1205 is fixedly connected to the inner wall of the slot 1204, and the extrusion pad 1205 matches the rotating bracket 1203. When the rotating bracket 1203 is inserted into the slot 1204, in order to make the rotating bracket 1203 more firmly inserted into the slot 1204, the rotating bracket 1203 can be clamped by the extrusion pad 1205, and at the same time, the rotating bracket 1203 can be protected by the extrusion pad 1205 to prevent it from being damaged easily.

[0045] The above is only a preferred specific implementation manner of the present invention; but the protection scope of the present invention is not limited thereto; any technician familiar with the technical field within the technical scope disclosed by the present invention; any equivalent replacement or change based on the technical solution and improved concept of the present invention shall be covered by the protection scope of the present invention.

Claims

1. A low-cost, heavy hammer-percussion low-frequency directional sound source for underwater warning, comprising an inner anechoic layer (1), characterized in that: A symmetrical POM slideway (2) is fixedly connected inside the inner sound-absorbing layer (1), a vibration diaphragm (3) is fixedly connected to the inner wall of the inner sound-absorbing layer (1), and the vibration diaphragm (3) is located on the right side of the POM slideway (2), a low-frequency sound source (4) is fixedly connected to the outer end of the inner sound-absorbing layer (1), and the low-frequency sound source (4) is located on the right end of the vibration diaphragm (3), a return spring (5) is sleeved on the outer end of the POM slideway (2), a buffer (6) is fixedly connected to the inner wall of the inner sound-absorbing layer (1), and the buffer (6) is located on the left side of the POM slideway (2), a low-frequency sound wave direction (7) is provided on the outer side of the low-frequency sound source (4), and the POM slideway (2) is provided with a return spring (5). An electric excitation hammer (8) is fixedly connected to the inner wall of the OM slideway (2), and the electric excitation hammer (8) is located on the right side of the return spring (5). A discharge coil (9) is fixedly connected to the outer end of the POM slideway (2). An energy storage capacitor and a power supply and trigger system (10) are fixedly connected to the lower end of the inner anechoic layer (1). A nitrogen pressure automatic compensation and pressure regulator (11) is fixedly connected to the energy storage capacitor and the power supply and trigger system (10). The nitrogen pressure automatic compensation and pressure regulator (11) is connected to the inner part of the inner anechoic layer (1). A seat bottom bracket (12) is fixedly connected to the lower end of the energy storage capacitor and the power supply and trigger system (10). The upper end of the base bracket (12) is provided with two symmetrical main water inlet holes (13), the main water inlet holes (13) are located outside the energy storage capacitor and the power supply and trigger system (10), the inner wall of the base bracket (12) is slidably connected with a hollow plate (14), the inner sound-absorbing layer (1) is filled with a plurality of deformable balloons (15), the outer end of the deformable balloon (15) is provided with a plurality of evenly distributed through holes (16), the inner wall of the through hole (16) is fixedly connected with a water-absorbing sheet (17), the deformable balloon (15) is filled with expansive soil (19), the lower end of the base bracket (12) is fixedly connected with two groups of symmetrical bottom blocks (20), The lower end of the bottom block (20) is fixedly connected with an anchor claw (21); the outer end of the seat bottom bracket (12) is provided with two symmetrical auxiliary water inlet holes (1201); the auxiliary water inlet holes (1201) are located at the lower side of the main water inlet hole (13); the lower end of the seat bottom bracket (12) is fixedly connected with a balance block (1202); the balance block (1202) is located between the two groups of anchor claws (21); the lower end of the balance block (1202) is rotatably connected with two symmetrical rotating brackets (1203); the lower end of the balance block (1202) is provided with a slot (1204); the rotating bracket (1203) is inserted into the slot (1204).

2. According to claim 1, a low-cost heavy hammer percussion low-frequency directional sound source for underwater warning, characterized in that: A pull ring (101) is fixedly connected to the upper end of the inner sound-absorbing layer (1), and a waterproof layer is coated on the surface of the pull ring (101).

3. According to claim 1, a low-cost heavy hammer percussion low-frequency directional sound source for underwater warning, characterized in that: A pressing pad (1205) is fixedly connected to the inner wall of the clamping slot (1204), and the pressing pad (1205) matches the rotating bracket (1203).

4. According to claim 1, a low-cost heavy hammer percussion low-frequency directional sound source for underwater warning, characterized in that: Two symmetrical blocking blocks (1401) are fixedly connected to the upper end of the hollow plate (14), the blocking blocks (1401) match the main water inlet holes (13), and a leakage hole (1402) is drilled at the upper end of the blocking blocks (1401).

5. According to claim 1, a low-cost heavy hammer percussion low-frequency directional sound source for underwater warning, characterized in that: A weight-increasing block (1403) is fixedly connected to the upper end of the hollow plate (14), and the weight-increasing block (1403) is located between the blocking blocks (1401).

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