Submarine sensing and collecting device and submarine sensing and collecting device assembly

Abstract

The application provides a seabed sensing and collecting device and a seabed sensing and collecting device assembly, and belongs to the technical field of marine monitoring devices.The seabed sensing and collecting device comprises a sound-transmitting sealing sleeve, a piezoelectric ceramic and a multi-core corrosion-resistant cable.The piezoelectric ceramic is arranged in an acoustic cavity in the sound-transmitting sealing sleeve.The acoustic cavity is filled with a solidified encapsulating glue.The piezoelectric ceramic is fixed and sealed after the encapsulating glue is solidified.The sound-transmitting sealing sleeve can effectively protect the piezoelectric ceramic.After the piezoelectric ceramic is sealed by the solidified encapsulating glue, sound waves are completely transmitted to the piezoelectric ceramic through the sound-transmitting sealing sleeve and the solidified encapsulating glue, ensuring detection accuracy and simple structure.The seabed sensing and collecting device assembly integrates the piezoelectric ceramic and a vibration sensor and is fixed on a counterweight chassis.The weight of the counterweight chassis sinks the seabed sensing and collecting device into the seabed, avoiding changes in the direction.The support legs of the counterweight chassis support the seabed, and vibrations are transmitted to the seabed sensing and collecting device through the support legs and the counterweight chassis, ensuring that the collected vibration information is accurate.

Description

Technical Field

[0001] This application belongs to the field of marine monitoring device technology, and more specifically, relates to a seabed sensing and acquisition device and a seabed sensing and acquisition device assembly. Background Technology

[0002] The seabed sensing and acquisition device contains a combination of various sensors to collect various signals from the seabed for later data processing and analysis. For example, it uses vibration sensors to detect and collect seabed vibration signals, and piezoelectric ceramics to collect acoustic pressure signals in the water. Due to the characteristics of its material, piezoelectric ceramics are easily damaged by impacts. However, the device needs to transmit acoustic pressure signals from the water to the piezoelectric ceramics; directly exposing the piezoelectric ceramics to water would easily lead to impacts and shorten their lifespan.

[0003] In the prior art, Chinese invention patent CN108732252B discloses a transducer for in-situ measurement of the acoustic characteristics of seabed sediments. In this design, a piezoelectric ceramic tube is sleeved outside a bearing shaft and placed inside a sound-permeable sealing sleeve. An inner oil cavity is formed between the piezoelectric ceramic tube and the bearing shaft, and an outer oil cavity is formed between the piezoelectric ceramic tube and the sound-permeable sealing sleeve. Both the inner and outer oil cavities are filled with low-resistance oil. The sound-permeable sealing sleeve protects the piezoelectric ceramic tube. However, since the low-resistance oil is in liquid form, it cannot support and fix the piezoelectric ceramic tube. Therefore, a metal skeleton ring and an epoxy positioning ring are needed to fix the piezoelectric ceramic tube on the bearing shaft and prevent sound wave vibrations from propagating along the bearing shaft. Simultaneously, an oil injection and drainage system and a sealing structure are required to fill and release the low-resistance oil and ensure that the low-resistance oil does not leak. The above structure makes the entire device very complex. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this application provides a seabed sensing and acquisition device and a seabed sensing and acquisition device assembly, which can effectively protect piezoelectric ceramics, ensure the transmission of sound waves to piezoelectric ceramics, and significantly simplify the structure.

[0005] To achieve the above objectives, the technical solution of this application provides a seabed sensing and acquisition device, including an acoustically transparent sealing sleeve, a piezoelectric ceramic, and a multi-core corrosion-resistant cable. The acoustically transparent sealing sleeve has an acoustic cavity, the piezoelectric ceramic is placed in the acoustic cavity, and the multi-core corrosion-resistant cable extends from the outside of the acoustically transparent sealing sleeve and is introduced into the acoustically transparent sealing sleeve. The core of the multi-core corrosion-resistant cable is introduced into the acoustic cavity and connected to the piezoelectric ceramic. The acoustic cavity is filled with encapsulating adhesive, and the piezoelectric ceramic is submerged in the encapsulating adhesive and fixed inside the solidified encapsulating adhesive.

[0006] The acoustically transparent sealing sleeve effectively protects the piezoelectric ceramic. After the piezoelectric ceramic is sealed by the solidified encapsulating adhesive, sound waves can be completely transmitted to the piezoelectric ceramic through the acoustically transparent sealing sleeve and the solidified encapsulating adhesive, ensuring detection accuracy. At the same time, since the solidified encapsulating adhesive fixes the position of the piezoelectric ceramic, there is no need to set up additional fixing structures or seal it with liquid, which greatly simplifies the overall structure of the device and reduces production costs and difficulty.

[0007] Alternatively, the encapsulating adhesive may be made of polyurethane or epoxy resin.

[0008] Optionally, the piezoelectric ceramic has a sheet-like structure, and the acoustic sealing sleeve has a single-end open cylindrical structure. The acoustic sealing sleeve has an open end and a sealed end. The acoustic cavity is located inside the sealed end, and the core of the multi-core corrosion-resistant cable is introduced into the acoustic cavity from the open end. An acoustic protective cap is fitted on the outside of the sealed end, and a transition cavity is formed between the acoustic protective cap and the outer wall of the sealed end. The side wall of the acoustic protective cap has two sets of first slots and several second slots communicating with the transition cavity. The two sets of first slots are respectively facing the two sides of the piezoelectric ceramic, and the several second slots are located on the side of the edge of the piezoelectric ceramic.

[0009] The acoustic protective cap, attached to the outside of the sealing end, prevents debris in the water from directly colliding with the outer wall of the sealing end, thus preventing leakage of the acoustic cavity. Water flows through the first and second slots into the transition cavity. Sound waves pass through the first slot and propagate vibrations within the transition cavity to the sealing end and then to the surface of the piezoelectric ceramic within the acoustic cavity, ensuring accurate detection data. In use, the piezoelectric ceramic is arranged upright in the water, with the two first slots located on either side horizontally and the second slots on the top and bottom sides. In water rich in sediment, sediment deposited in the transition cavity can be discharged through the second slot at the bottom, preventing sediment accumulation and blockage of the transition cavity.

[0010] Optionally, the outer wall of the sealing end is provided with a cylindrical snap-fit ​​platform, the outer wall of the cylindrical snap-fit ​​platform is provided with a snap-fit ​​protrusion, the inner wall of the acoustic protective cap is provided with an annular inner groove, and the end of the acoustic protective cap is provided with an insertion notch that communicates with the annular inner groove. The acoustic protective cap is sleeved on the outer side of the cylindrical snap-fit ​​platform, the snap-fit ​​protrusion is inserted into the annular inner groove from the insertion notch, and the snap-fit ​​protrusion is rotated into the annular inner groove by interference fit, thereby realizing the fixed connection between the acoustic protective cap and the sound-permeable sealing sleeve.

[0011] Optionally, the piezoelectric ceramics are arranged in several groups, and the acoustic cavity has several grooves corresponding to the piezoelectric ceramics one by one. The grooves are arranged linearly and at intervals, and the piezoelectric ceramics are embedded into the corresponding grooves one by one. A water channel is opened on the outside of the sealing end, passing through any two adjacent grooves. Water entering the transition cavity can enter the water channel, and sound waves are transmitted from the water channel to the wall of the sealing end and to the surface of the piezoelectric ceramics.

[0012] Optionally, it also includes a vibration sensing component, and a vibration cavity is provided inside the sound-permeable sealing sleeve. The acoustic cavity is connected to the side of the vibration cavity opposite to the outlet end. The vibration sensing component includes a cylindrical fixed base, a pressure-bearing cylinder, and three sets of vibration sensors. The side wall of the cylindrical fixed base has two mounting cavities, and the end of the cylindrical fixed base has a third mounting cavity. The extending directions of the three mounting cavities are perpendicular to each other. The three sets of vibration sensors are fixedly installed in the three mounting cavities, respectively, and are arranged perpendicular to each other. The pressure-bearing cylinder is fixed. The pressure-bearing cylinder is fixedly installed inside the vibration cavity from the open end of the cylindrical fixed base. The third mounting cavity is set on the side facing the acoustic cavity. The end of the pressure-bearing cylinder facing the acoustic cavity is sealed with an end cap. The end cap is bonded to the sealing adhesive away from the side wall of the pressure-bearing cylinder. The multi-core corrosion-resistant cable extends from the end of the cylindrical fixed base away from the third mounting cavity and enters the cylindrical fixed base. Part of the multi-core corrosion-resistant cable is connected to the three sets of vibration sensors respectively. The other part of the multi-core corrosion-resistant cable passes through the cylindrical fixed base and the end cap, and extends into the acoustic cavity and connects to the piezoelectric ceramic.

[0013] The vibration sensors are directional; three sets of mutually perpendicular vibration sensors form a Cartesian coordinate system, enabling the detection of vibration signals from all directions. The entire device can detect both acoustic wave information in the water and vibration information at the bottom of the water body, achieving a combined function.

[0014] Optionally, the end cap and the pressure-bearing cylinder are connected by screws. The end cap has a through hole that connects the acoustic cavity and the interior of the pressure-bearing cylinder. The core wire of the multi-core corrosion-resistant cable connected to the piezoelectric ceramic passes through the through hole into the acoustic cavity. The side wall of the cylindrical fixing base has three sets of threaded connection holes that extend from the side to mounting cavity one, mounting cavity two, and mounting cavity three, respectively. Three sets of vibration sensors are fixedly installed in mounting cavity one, mounting cavity two, and mounting cavity three by screws that screw through the three sets of threaded connection holes. The end of the cylindrical fixing base away from mounting cavity three has a sealing platform that seals the end of the pressure-bearing cylinder away from the end cap. The pressure-bearing cylinder and the sealing platform are connected by screws to realize the assembly of the end cap, the pressure-bearing cylinder, the multi-core corrosion-resistant cable, and the cylindrical fixing base.

[0015] Optionally, it also includes an external threaded plug. A connecting post is provided on the side of the sealing platform away from the installation cavity. Several annular protrusions are distributed on the outer wall of the connecting post. A threaded countersunk hole is opened at the end of the connecting post away from the sealing platform. The external threaded plug is sleeved on the outside of the multi-core corrosion-resistant cable and screwed into the threaded countersunk hole. An injection head is covered on the outside of the connecting post. The injection head seals the connection between the multi-core corrosion-resistant cable, the external threaded plug and the threaded countersunk hole. The injection head also seals the connection between the sound-permeable sealing sleeve, the pressure-bearing cylinder and the sealing platform, thereby achieving a seal at the end of the device.

[0016] A seabed sensing and acquisition device assembly includes a counterweight chassis and the aforementioned seabed sensing and acquisition device. The counterweight chassis has a strip-shaped mounting hole in the middle and several hollowed-out openings distributed on its surface. The seabed sensing and acquisition device is horizontally placed in the strip-shaped mounting hole and bolted to the counterweight chassis. Multiple support feet are arranged around the circumference of the counterweight chassis.

[0017] Because the three sets of vibration sensors are directional, the counterweight chassis achieves an overall weight-increasing effect. After the seabed sensing and acquisition device is installed in the strip-shaped mounting holes, it ensures the stability of the device's position in the water. The perforated opening ensures good sand penetration, facilitating rapid coupling into and out of the sediment. When the seabed sensing and acquisition device assembly is placed on the seabed, the support feet sink into the sediment, and the sound-permeable sealing sleeve directly contacts the seabed to receive vibration signals, ensuring accurate signal reception. The support feet sinking into the sediment ensure good coupling between the seabed sensing and acquisition device assembly and the seabed, increasing stability.

[0018] Optionally, the device also includes a clamping ring. The upper surface of the counterweight base, located on both sides of the strip-shaped mounting hole, has several pits. Each pit contains a bolt hole. The outer wall of the acoustically transparent sealing sleeve has several connecting parts corresponding to each pit. Each connecting part has a bolt hole corresponding to the bolt hole. The connecting parts are placed in the corresponding pit and connected to each other by bolts passing through bolt holes. The end of the strip-shaped mounting hole has a lower groove, and the clamping ring has an upper groove. The root of the multi-core corrosion-resistant cable is clamped between the upper and lower grooves. Both ends of the clamping ring are bolted to the counterweight base, achieving a fixed connection between the seabed sensing and acquisition device and the counterweight base. The outer wall of the acoustically transparent sealing sleeve has a positive marking to ensure accurate installation orientation. Each support foot includes a lower protrusion extending to the bottom of the counterweight base and an upper protrusion extending to the top of the counterweight base. The lower protrusion is used for support on the ground. As for the upper protrusion, since the multi-core corrosion-resistant cable has a long extension length, it will be placed on top of the counterweight chassis in a spiral coil during transportation. At this time, the edge of the multi-core corrosion-resistant cable is blocked by the upper protrusion to prevent it from spreading out.

[0019] The advantages of the technical solution in this application compared to the prior art are as follows: The acoustically transparent sealing sleeve effectively protects the piezoelectric ceramic. After the piezoelectric ceramic is sealed by the solidified encapsulating adhesive, sound waves can be completely transmitted to the piezoelectric ceramic through the acoustically transparent sealing sleeve and the solidified encapsulating adhesive, ensuring detection accuracy. At the same time, since the solidified encapsulating adhesive fixes the position of the piezoelectric ceramic, there is no need to set up additional fixing structures or seal it with liquid, which greatly simplifies the overall structure of the device and reduces production costs and difficulty.

[0020] The seabed sensing and acquisition device assembly integrates piezoelectric ceramics and a three-dimensional vibration sensor. The piezoelectric ceramics pick up acoustic pressure signals in the water, while the vibration sensor detects and picks up seabed vibration signals. Because the three-dimensional vibration sensor is directional, to avoid attitude changes caused by ocean currents, the weight of a counterweight chassis submerges the seabed sensing and acquisition device, preventing swaying. With support feet firmly planted on the seabed, vibrations are transmitted to the seabed sensing and acquisition device through the support feet and the counterweight chassis, ensuring accurate vibration information collection. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A schematic diagram of the overall structure of the seabed sensing and data acquisition device; Figure 2 An exploded view of the overall structure of the seabed sensing and data acquisition device; Figure 3 A schematic diagram of the sound-permeable sealing sleeve and acoustic protective cap; Figure 4 A top-view cross-sectional view of the underwater sensing and data acquisition device located in the acoustic cavity; Figure 5 This is a schematic diagram of the installation structure of the vibration sensor and the cylindrical fixing base; Figure 6 A schematic diagram of the installation structure for the cylindrical fixed base, pressure-bearing cylinder, and end cap; Figure 7 A schematic diagram of the installation structure of the cylindrical fixed base and the injection head; Figure 8 A sectional view of the installation structure of the cylindrical fixed base and the injection head; Figure 9 This is a schematic diagram of the overall structure of the seabed sensing and data acquisition device assembly. Figure 10 This is a schematic diagram of the counterweight chassis structure.

[0023] Icons: 1. Acoustic sealing sleeve; 10. Sealing adhesive; 101. Acoustic cavity; 102. Open end; 103. Sealed end; 104. Cylindrical snap-fit ​​platform; 105. Snap-fit ​​protrusion; 106. Groove; 107. Water channel; 108. Vibration cavity; 109. Connecting part; 110. Bolt hole two; 111. Positive marking; 112. Step; 21. Piezoelectric ceramic; 22. Impedance matching device; 3. Multi-core corrosion-resistant cable; 4. Acoustic protective cap; 401. Transition cavity; 402. First slot; 403. Second slot; 404. Annular inner groove; 405. Insertion notch; 5. Columnar fixing base; 501. Mounting cavity one; 502. Mounting cavity 2; 503, Mounting cavity 3; 504, Threaded connection hole; 505, Sealing platform; 506, External threaded plug; 507, Connecting column; 508, Annular convex ridge; 509, Threaded countersunk hole; 510, Injection head; 511, Wiring through hole; 512, Columnar protrusion; 6, Pressure bearing cylinder; 61, End cap; 611, Through hole; 62, Screw hole 1; 63, Screw hole 2; 7, Vibration sensor; 8, Counterweight chassis; 801, Strip mounting hole; 802, Hollowed-out through opening; 803, Support foot; 804, Pressure clamp; 805, Sink; 806, Bolt hole 1; 807, Lower groove; 808, Upper groove; 809, Lower protrusion; 810, Upper protrusion. Detailed Implementation

[0024] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0025] Example 1: This embodiment provides a seabed sensing and data acquisition device, based on... Figures 1 to 4 As shown, the device includes an acoustically permeable sealing sleeve 1, a piezoelectric ceramic 21, and a multi-core corrosion-resistant cable 3. The acoustically permeable sealing sleeve 1 has an acoustic cavity 101, and the piezoelectric ceramic 21 is placed in the acoustic cavity 101. The acoustically permeable sealing sleeve 1 is used to protect the piezoelectric ceramic 21. In this embodiment, the acoustically permeable sealing sleeve 1 is injection molded from a corrosion-resistant polyurethane material. The multi-core corrosion-resistant cable 3 extends from the outside of the acoustically permeable sealing sleeve 1 and is introduced into the acoustically permeable sealing sleeve 1. The cores of the multi-core corrosion-resistant cable 3 are introduced into the acoustic cavity 101 and connected to the piezoelectric ceramic 21. An impedance matching device 22 is also placed inside the acoustic cavity 101. The cores of the multi-core corrosion-resistant cable 3 are connected to the secondary winding of the impedance matching device 22, and the primary winding of the impedance matching device 22 is connected to the piezoelectric ceramic 21 through a wire. After the piezoelectric ceramic 21 senses a pressure signal, its charge change is converted into a voltage by the impedance matching device 22, and then the signal is conducted to the outside by the cores of the multi-core corrosion-resistant cable 3.

[0026] Based on the above structure, the acoustic cavity 101 is filled with encapsulating adhesive 10, and the piezoelectric ceramic 21 is submerged in the encapsulating adhesive 10 and fixed inside the solidified encapsulating adhesive 10. In this embodiment, the encapsulating adhesive 10 is made of polyurethane, but epoxy resin can also be used. During production, the encapsulating adhesive 10 is first injected into the acoustic cavity 101. Before the encapsulating adhesive 10 solidifies, the piezoelectric ceramic 21 and the impedance matching device 22 are submerged in the encapsulating adhesive 10. After the encapsulating adhesive 10 solidifies, the piezoelectric ceramic 21 and the impedance matching device 22 are fixed inside the acoustic cavity 101. After the piezoelectric ceramic 21 is sealed by the solidified encapsulating adhesive 10, the sound waves in the water can be completely transmitted to the piezoelectric ceramic 21 through the sound-transmitting sealing sleeve 1 and the solidified encapsulating adhesive 10, ensuring detection accuracy. Meanwhile, since the solidified encapsulating adhesive 10 fixes the position of the piezoelectric ceramic 21, there is no need to set up an additional fixing structure or seal it with liquid, which greatly simplifies the structure of the entire device and reduces production costs and production difficulty.

[0027] based on Figures 2 to 4As shown, the piezoelectric ceramic 21 has a sheet-like structure, and the acoustic sealing sleeve 1 has a single-end open cylindrical structure. The acoustic sealing sleeve 1 has an open end 102 and a sealed end 103. The acoustic cavity 101 is located inside the sealed end 103, and the core of the multi-core corrosion-resistant cable 3 is introduced into the acoustic cavity 101 from the open end 102. An acoustic protective cap 4 is fitted on the outside of the sealed end 103, and a transition cavity 401 is formed between the acoustic protective cap 4 and the outer wall of the sealed end 103. The side wall of the acoustic protective cap 4 has two sets of first slots 402 and several second slots 403 communicating with the transition cavity 401. Here, "several" indicates that there is at least one second slot 403. The two sets of first slots 402 are respectively facing the two side surfaces of the piezoelectric ceramic 21, and the several second slots 403 are located on the side of the edge of the piezoelectric ceramic 21. In this embodiment, there are six second slots 403, and they are arranged in groups of three, located on the edge of the piezoelectric ceramic 21. Of course, the number of second slots 403 can be changed according to actual conditions. Due to the complex environment in the water, the acoustic protective cap 4, fastened to the outside of the sealing end 103, can prevent debris in the water from directly colliding with the outer wall of the sealing end 103, thus preventing leakage of the acoustic cavity 101. The water is connected to the transition cavity 401 through the first slot 402 and the second slot 403. The first slot 402 has a larger opening area, and the two sides of the piezoelectric ceramic 21 serve as pressure-receiving surfaces to receive sound wave signals. The larger area of ​​the first slot 402 can ensure that the sound waves pass through completely, reducing sound wave loss. Since the first slot 402 is directly opposite the surface of the piezoelectric ceramic 21, the sound waves, after passing through the first slot 402, propagate the vibration to the sealing end 103 in the transition cavity 401, and then to the surface of the piezoelectric ceramic 21 in the acoustic cavity 101, ensuring the accuracy of the detection data. The first slot 402 and the second slot 403 can ensure the flow of water in the transition cavity 401. In practical use, the piezoelectric ceramic 21 is arranged upright in the water, with two first slots 402 located on both sides in the horizontal direction and second slots 403 located on the upper and lower sides. In water rich in sediment, the sediment can be discharged from the second slots 403 at the bottom after being deposited in the transition cavity 401, preventing sediment from accumulating and clogging the transition cavity 401.

[0028] A cylindrical locking platform 104 is provided on the outer wall of the sealing end 103, and a locking protrusion 105 is provided on the outer wall of the cylindrical locking platform 104. An annular inner groove 404 is provided on the inner wall of the acoustic protective cap 4. An insertion notch 405 communicating with the annular inner groove 404 is opened at the end of the acoustic protective cap 4. The acoustic protective cap 4 is sleeved on the outer side of the cylindrical locking platform 104. The locking protrusion 105 is inserted into the annular inner groove 404 from the insertion notch 405, and the locking protrusion 105 is rotated into the annular inner groove 404 by interference fit. Both the sound-permeable sealing sleeve 1 and the acoustic protective cap 4 are injection molded from corrosion-resistant polyurethane material, which has a certain degree of elasticity. The size of the locking protrusion 105 is slightly larger than the size of the annular inner groove 404. Through a certain elastic deformation, the locking protrusion 105 is pressed into the annular inner groove 404 to ensure a stable connection.

[0029] Furthermore, based on Figure 3 and Figure 4 As shown, the piezoelectric ceramics 21 are arranged in several groups, where "several groups" refers to at least two groups. The acoustic cavity 101 has several grooves 106 corresponding to each piezoelectric ceramic 21. These grooves 106 are arranged linearly and at intervals. The piezoelectric ceramics 21 are inserted into their respective grooves 106 one by one. A water channel 107 is provided on the outer side of the sealing end 103, passing through any two adjacent grooves 106. Specifically, in this embodiment, there are two groups of piezoelectric ceramics 21, corresponding to two grooves 106 within the acoustic cavity 101. Of course, the number of piezoelectric ceramics 21 and grooves 106 can be set to three or four, etc., depending on the actual situation. During installation, the encapsulating adhesive 10 fills the acoustic cavity 101 and the grooves 106 inside, and then the piezoelectric ceramics 21 are placed into the grooves 106, with the two groups of piezoelectric ceramics 21 parallel to each other. To prevent the opposing surfaces of adjacent piezoelectric ceramics 21 from not receiving sound waves, a water channel 107 is provided between two adjacent grooves 106. The water entering the transition cavity 401 can also enter the water channel 107. The sound waves are transmitted from the water channel 107 to the wall of the sealing end 103 and to the surface of the piezoelectric ceramic 21.

[0030] Furthermore, based on Figures 2 to 6As shown, it also includes a vibration sensing component. A vibration cavity 108 is also provided inside the sound-permeable sealing sleeve 1, and an acoustic cavity 101 is connected to the side of the vibration cavity 108 opposite to the outlet end 102. The vibration sensing component is used to detect vibrations at the bottom of the water body, enabling the entire device to detect both sound wave information in the water body and vibration information at the bottom of the water body, achieving a combined function. Specifically, the vibration sensing component includes a cylindrical fixed base 5, a pressure-bearing cylinder 6, and three sets of vibration sensors 7. The side wall of the cylindrical fixed base 5 has a first mounting cavity 501 and a second mounting cavity 502, and the end of the cylindrical fixed base 5 has a third mounting cavity 503. The extending directions of the first mounting cavity 501, the second mounting cavity 502, and the third mounting cavity 503 are perpendicular to each other. The three sets of vibration sensors 7 are respectively fixedly installed in the first mounting cavity 501, the second mounting cavity 502, and the third mounting cavity 503, and are arranged perpendicularly to each other. Because the vibration sensor 7 has directional detection, three sets of mutually perpendicular vibration sensors 7 form a Cartesian coordinate system, capable of sensing vibration signals in all directions. The pressure-bearing cylinder 6 is fixedly sleeved on the outside of the cylindrical fixed base 5, and is fixedly installed inside the vibration cavity 108 from the open end 102. The mounting cavity 503 is positioned facing the acoustic cavity 101, and an end cap 61 is sealed at the end of the pressure-bearing cylinder 6 facing the acoustic cavity 101. The end cap 61, away from the side wall of the pressure-bearing cylinder 6, is adhered to the encapsulating adhesive 10. Specifically, after the cylindrical fixed base 5 with the vibration sensor 7 is placed into the pressure-bearing cylinder 6, the end of the pressure-bearing cylinder 6 is sealed by the end cap 61. Before the encapsulating adhesive 10 solidifies, the end of the pressure-bearing cylinder 6 with the end cap 61 is inserted into the sound-permeable sealing sleeve 1 from the open end 102, with the end cap 61 in contact with the encapsulating adhesive 10. Adhesion is achieved after the encapsulating adhesive 10 solidifies. To ensure the accurate positioning of the pressure-bearing cylinder 6, the sound-permeable sealing sleeve 1 has a step 112 inside, and the end cap 61 abuts against and limits the step 112.

[0031] A multi-core corrosion-resistant cable 3 extends from the end of the cylindrical fixing base 5 furthest from the mounting cavity 503 and enters the cylindrical fixing base 5. Part of the cores of the multi-core corrosion-resistant cable 3 are connected to the three sets of vibration sensors 7 respectively. Another part of the cores of the multi-core corrosion-resistant cable 3 passes through the cylindrical fixing base 5 and the end cap 61, and extends into the acoustic cavity 101 before connecting to the piezoelectric ceramic 21. The multi-core corrosion-resistant cable 3 has multiple cores inside, which are used to connect to the three sets of vibration sensors 7 and the piezoelectric ceramic 21 respectively. To ensure proper wiring, a wiring through-hole 511 is provided along the axial direction of the cylindrical fixing base 5. The wiring through-hole 511 passes through the first mounting cavity 501, the second mounting cavity 502, and the third mounting cavity 503, so that the cores can be connected to the three sets of vibration sensors 7 respectively.

[0032] Furthermore, based on Figure 6As shown, the end cap 61 and the pressure-bearing cylinder 6 are connected by screws. Specifically, screw holes 62 are provided around the circumference of both the end cap 61 and the pressure-bearing cylinder 6, one after the other. After the end cap 61 is fastened to the end of the pressure-bearing cylinder 6, the screw holes 62 are aligned and connected to each other by screws. The end cap 61 has a through hole 611, which connects the acoustic cavity 101 and the interior of the pressure-bearing cylinder 6. The wire core of the multi-core corrosion-resistant cable 3, which is connected to the piezoelectric ceramic 21, passes through the through hole 611 into the acoustic cavity 101 to connect with the impedance matching device 22 and the piezoelectric ceramic 21. The through hole 611 is small in size, so the high-viscosity encapsulating adhesive 10 will not flow into the pressure-bearing cylinder 6 through the through hole 611. At the same time, based on Figure 7 As shown, the cylindrical fixing base 5 has three sets of threaded connection holes 504 on its side wall. These three sets of threaded connection holes 504 extend from the side into mounting cavities 1 (501), 2 (502), and 3 (503), respectively. Three sets of vibration sensors 7 are fixedly installed in mounting cavities 1 (501), 2 (502), and 3 (503) by screws that pass through the three sets of threaded connection holes 504. If the side wall of the vibration sensor 7 has corresponding screw holes, it can be directly screwed in for fixation. If the side wall of the vibration sensor 7 does not have screw holes, the vibration sensor 7 can be pressed against the screw by the end of the screw. The end of the cylindrical fixed base 5 away from the mounting cavity 503 has a sealing platform 505. The sealing platform 505 seals the end of the pressure cylinder 6 away from the end cover 61. The pressure cylinder 6 and the sealing platform 505 are connected by screws. Specifically, screw holes 63 are provided around the sealing platform 505 and the pressure cylinder 6 in the circumferential direction. After the sealing platform 505 seals the end of the pressure cylinder 6, the screw holes 63 of the two are aligned with each other and connected to each other by screws.

[0033] Furthermore, based on Figure 2 , Figure 7 and Figure 8As shown, it also includes an external threaded plug 506. A connecting post 507 extends from the side of the sealing platform 505 away from the mounting cavity 501, and a plurality of annular protrusions 508 are distributed on the outer wall of the connecting post 507. "A plurality of" means at least two. In this embodiment, there are three annular protrusions 508. A threaded countersunk hole 509 is formed at the end of the connecting post 507 away from the sealing platform 505. The external threaded plug 506 is fitted onto the outside of the multi-core corrosion-resistant cable 3 and screwed into the threaded countersunk hole 509. The threaded countersunk hole 509 directly connects to the cable routing hole 511. The outer wall of the multi-core corrosion-resistant cable 3 can be fixed to the inside of the external threaded plug 506 by bonding or interference fit, or it can directly pass through the inside of the external threaded plug 506. When the external threaded plug 506 is screwed into the threaded countersunk hole 509, the multi-core corrosion-resistant cable 3 can be fixed. The outer side of the connecting post 507 is covered by an injection head 510. The injection head 510 seals the connection points between the multi-core corrosion-resistant cable 3, the external threaded plug 506, and the threaded countersunk hole 509, and also seals the connection points between the sound-permeable sealing sleeve 1, the pressure-bearing cylinder 6, and the sealing platform 505. Specifically, during production, the assembled product is placed on an injection molding machine, and the injection head 510 is generated through injection molding. After solidification, the injection head 510 completely seals the ends of the external threaded plug 506, the connecting post 507, the sound-permeable sealing sleeve 1, the pressure-bearing cylinder 6, and the sealing platform 505, as well as the gaps between them, achieving a seal for the product. During injection molding, the material enters the gaps between the annular ridges 508, ensuring the stability of the injection head 510.

[0034] Example 2: This embodiment provides a seabed sensing and acquisition device assembly, based on... Figure 9 and Figure 10As shown, the device includes a counterweight base 8 and the seabed sensing and acquisition device from Embodiment 1. The counterweight base 8 has a strip-shaped mounting hole 801 in its center, and several perforated openings 802 are distributed on its surface. The seabed sensing and acquisition device is horizontally placed within the strip-shaped mounting hole 801 and bolted to the counterweight base 8. Multiple support feet 803 are arranged around the circumference of the counterweight base 8. In this embodiment, the counterweight base 8 is manufactured using a casting process, with multiple cast iron spokes interconnected to form several perforated openings 802 and a strip-shaped mounting hole 801. Since the three sets of vibration sensors 7 are directional, if the seabed sensing and acquisition device deflects with the water flow, it will cause inaccurate information collection. The counterweight base 8 achieves an overall counterweight increase effect, and the installation of the seabed sensing and acquisition device within the strip-shaped mounting hole 801 ensures the stability of the device's position in the water. The perforated openings 802 ensure overall sand penetration, facilitating rapid coupling into the sediment and easy extraction from it. When the seabed sensing and acquisition device assembly is placed on the seabed, the support foot 803 sinks into the mud and sand, and the sound-permeable sealing sleeve 1 is in direct contact with the seabed to receive vibration signals, ensuring accurate signal reception. The support foot 803 sinking into the mud and sand enables good coupling between the seabed sensing and acquisition device assembly and the seabed, increasing stability. During production, the support foot 803 also facilitates overall leveling during production testing. When the seabed sensing and acquisition device assembly is stacked on the ground, the support foot 803 can lift the counterweight chassis 8 off the ground, facilitating layer-by-layer stacking.

[0035] Furthermore, based on Figure 1 , Figure 9 and Figure 10As shown, it also includes a clamping ring 804. The upper surface of the counterweight base 8, located on both sides of the strip-shaped mounting hole 801, is provided with a plurality of recesses 805, where "a plurality of" indicates at least one. In this embodiment, each edge of the strip-shaped mounting hole 801 is provided with two recesses 805, for a total of four recesses 805. Each recess 805 is provided with a bolt hole 806. The outer wall of the sound-permeable sealing sleeve 1 is distributed with a plurality of connecting portions 109 corresponding to each of the recesses 805. In this embodiment, there are four connecting portions 109. Each connecting portion 109 has a bolt hole 110 corresponding to the bolt hole 806. The connecting portions 109 are placed in the corresponding recesses 805 and connected to each other by bolts passing through the bolt holes 806 and 110. The end of the strip-shaped mounting hole 801 has a lower groove 807, and the clamping ring 804 has an upper groove 808. The clamp 804 is made of stainless steel sheet by stamping, and the root of the multi-core corrosion-resistant cable 3 is clamped between the upper groove 808 and the lower groove 807. Both ends of the clamp 804 are bolted to the counterweight base 8. In this embodiment, the multi-core corrosion-resistant cable 3 is located at the end of the injection head 510 as the root of the multi-core corrosion-resistant cable 3. Specifically, the end of the injection head 510 is integrally formed with a columnar protrusion 512, and the root of the multi-core corrosion-resistant cable 3 is located within the columnar protrusion 512, which is clamped between the upper groove 808 and the lower groove 807. This ensures a stable connection.

[0036] Since the three sets of vibration sensors 7 are directional, the outer wall of the sound-permeable sealing sleeve 1 is provided with a positive marking 111 to ensure the correct installation orientation. Meanwhile, each support foot 803 includes a lower protrusion 809 extending to the bottom of the counterweight base 8 and an upper protrusion 810 extending to the top of the counterweight base 8. In this embodiment, there are four support feet 803, each with a semi-circular upper protrusion 810 and a semi-circular lower protrusion 809. The lower protrusion 809 is used to support the ground. As for the upper protrusion 810, since the multi-core corrosion-resistant cable 3 has a relatively long extension length, it will be coiled on top of the counterweight base 8 during transportation. At this time, the edge of the multi-core corrosion-resistant cable 3 is shielded by the upper protrusion 810 to prevent it from unraveling.

[0037] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A seabed sensing and acquisition device, comprising an acoustically transparent sealing sleeve, a piezoelectric ceramic, and a multi-core corrosion-resistant cable, wherein the acoustically transparent sealing sleeve has an acoustic cavity, the piezoelectric ceramic is placed in the acoustic cavity, and the multi-core corrosion-resistant cable extends from the outside of the acoustically transparent sealing sleeve and is introduced into the acoustically transparent sealing sleeve, and the core of the multi-core corrosion-resistant cable is introduced into the acoustic cavity and connected to the piezoelectric ceramic. Its features are: The acoustic cavity is filled with encapsulating adhesive, and the piezoelectric ceramic is submerged in the encapsulating adhesive and fixed inside the solidified encapsulating adhesive.

2. The seabed sensing and acquisition device as described in claim 1, characterized in that: The encapsulating adhesive is made of polyurethane or epoxy resin.

3. The seabed sensing and acquisition device as described in claim 1, characterized in that: The piezoelectric ceramic has a sheet-like structure, the acoustically transparent sealing sleeve has a single-end open cylindrical structure, the acoustically transparent sealing sleeve has an open end and a sealed end, the acoustic cavity is located inside the sealed end, and the core of the multi-core corrosion-resistant cable is introduced into the acoustic cavity from the open end. An acoustic protective cap is fitted on the outer side of the sealing end, and a transition cavity is formed between the acoustic protective cap and the outer side wall of the sealing end. The side wall of the acoustic protective cap has two sets of first slots and several second slots that communicate with the transition cavity. The two sets of first slots are respectively facing the two side surfaces of the piezoelectric ceramic, and the several second slots are located on the side of the edge of the piezoelectric ceramic.

4. The seabed sensing and acquisition device as described in claim 3, characterized in that: The outer wall of the sealing end is provided with a cylindrical snap-fit ​​platform, and the outer wall of the cylindrical snap-fit ​​platform is provided with a snap-fit ​​protrusion. The inner wall of the acoustic protective cap is provided with an annular inner groove. The end of the acoustic protective cap is provided with an insertion notch that communicates with the annular inner groove. The acoustic protective cap is sleeved on the outer side of the cylindrical snap-fit ​​platform. The snap-fit ​​protrusion is inserted into the annular inner groove through the insertion notch, and the snap-fit ​​protrusion is rotated into the annular inner groove by an interference fit.

5. The seabed sensing and acquisition device as described in claim 3 or 4, characterized in that: The piezoelectric ceramic has several groups, and the acoustic cavity has several grooves that correspond one-to-one with the piezoelectric ceramic. The grooves are arranged linearly and at intervals. The piezoelectric ceramic is embedded into the corresponding groove one by one. A water channel passing through any two adjacent grooves is opened on the outside of the sealing end.

6. The seabed sensing and acquisition device as described in claim 3 or 4, characterized in that: It also includes a vibration sensing component, and a vibration cavity is provided inside the sound-permeable sealing sleeve. The acoustic cavity is connected to the side of the vibration cavity opposite to the opening end. The vibration sensing component includes a cylindrical fixed base, a pressure-bearing cylinder, and three sets of vibration sensors. The cylindrical fixed base has a first mounting cavity and a second mounting cavity on its side wall, and a third mounting cavity is formed at the end of the cylindrical fixed base. The extension directions of the first mounting cavity, the second mounting cavity, and the third mounting cavity are perpendicular to each other. The three sets of vibration sensors are respectively fixedly installed in the first mounting cavity, the second mounting cavity, and the third mounting cavity, and the three sets of vibration sensors are arranged perpendicular to each other. The pressure-bearing cylinder is fixedly sleeved on the outside of the cylindrical fixed base. The pressure-bearing cylinder is fixedly installed inside the vibration cavity from the open end. The mounting cavity three is arranged facing the acoustic cavity. The end of the pressure-bearing cylinder facing the acoustic cavity is sealed with an end cap. The end cap is bonded to the encapsulating adhesive away from the side wall of the pressure-bearing cylinder. The multi-core corrosion-resistant cable extends from the end of the cylindrical fixed base away from the mounting cavity three and enters the cylindrical fixed base. Part of the wires of the multi-core corrosion-resistant cable are respectively connected to the three sets of vibration sensors. The other part of the wires of the multi-core corrosion-resistant cable passes through the cylindrical fixed base and the end cap, and extends into the acoustic cavity and connects to the piezoelectric ceramic.

7. The seabed sensing and acquisition device as described in claim 6, characterized in that: The end cap is connected to the pressure-bearing cylinder by screws. The end cap has a through hole that connects the acoustic cavity and the interior of the pressure-bearing cylinder. The wire core of the multi-core corrosion-resistant cable that is connected to the piezoelectric ceramic passes through the through hole into the acoustic cavity. The side wall of the cylindrical fixing base is provided with three sets of threaded connection holes. The three sets of threaded connection holes pass through the mounting cavity one, the mounting cavity two and the mounting cavity three from the side respectively. The three sets of vibration sensors are fixedly installed in the mounting cavity one, the mounting cavity two and the mounting cavity three by screws that are screwed through the three sets of threaded connection holes. The cylindrical fixing base has a sealing platform at the end away from the mounting cavity three. The sealing platform seals the end of the pressure-bearing cylinder away from the end cap. The pressure-bearing cylinder and the sealing platform are connected by screws.

8. The seabed sensing and acquisition device as described in claim 7, characterized in that: It also includes an external threaded plug. A connecting post extends from the side of the sealing platform away from the mounting cavity. Several annular protrusions are distributed on the outer side wall of the connecting post. A threaded countersunk hole is opened at the end of the connecting post away from the sealing platform. The external threaded plug is sleeved on the outside of the multi-core corrosion-resistant cable and screwed into the threaded countersunk hole. An injection head covers the outside of the connecting post. The injection head seals the connection between the multi-core corrosion-resistant cable, the external threaded plug, and the threaded countersunk hole. The injection head also seals the connection between the sound-permeable sealing sleeve, the pressure-bearing cylinder, and the sealing platform.

9. A seabed sensing and data acquisition device assembly, characterized in that: The device includes a counterweight chassis and a seabed sensing and acquisition device as described in any one of claims 6-8. The counterweight chassis has a strip-shaped mounting hole in the middle and a plurality of hollowed-out openings distributed on the surface of the counterweight chassis. The seabed sensing and acquisition device is horizontally placed in the strip-shaped mounting hole and bolted to the counterweight chassis. A plurality of support feet are arranged around the circumference of the counterweight chassis.

10. The seabed sensing and acquisition device assembly as described in claim 9, characterized in that: It also includes a pressure clamp. The upper surface of the counterweight base located on both sides of the strip mounting hole is provided with several pits. Each pit is provided with a bolt hole one. The outer wall of the sound-permeable sealing sleeve is distributed with several connecting parts corresponding to the pits one by one. Each connecting part is provided with a bolt hole two opposite to the corresponding bolt hole one. The connecting parts are placed in the corresponding pit and connected to each other by bolts passing through the bolt hole one and the bolt hole two. The end of the strip-shaped mounting hole has a lower groove, the clamp has an upper groove, the root of the multi-core corrosion-resistant cable is clamped between the upper groove and the lower groove, both ends of the clamp are bolted to the counterweight chassis, the outer wall of the sound-permeable sealing sleeve is provided with a positive marking, and each of the support feet includes a lower protrusion extending to the bottom of the counterweight chassis and an upper protrusion extending to the top of the counterweight chassis.

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