CN113671583B - Ocean electric field sensor - Google Patents
Ocean electric field sensor Download PDFInfo
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- CN113671583B CN113671583B CN202111231333.1A CN202111231333A CN113671583B CN 113671583 B CN113671583 B CN 113671583B CN 202111231333 A CN202111231333 A CN 202111231333A CN 113671583 B CN113671583 B CN 113671583B
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- bevel gear
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- buoyancy
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
Abstract
The invention discloses an ocean electric field sensor which comprises two submerged buoyancy tanks symmetrically arranged left and right, wherein a floating and submerging assembly is arranged in each submerged buoyancy tank, a power box is arranged between the left submerged buoyancy tank and the right submerged buoyancy tank, and a sensor electrode is fixed on the lower side surface of each submerged buoyancy tank; the invention can change the total density through the up-and-down movement of the buoyancy adjusting block, thereby realizing the ascending and descending of the submerged buoyancy tanks, so that the invention can detect the ocean electric field intensity at different depths, and simultaneously, the submerged buoyancy tanks at the left side and the right side can be relatively close to or far away by utilizing the rotation of the spacing adjusting rod, thereby changing the spacing between the sensor electrodes at the left side and the right side, thereby meeting the detection requirements under different conditions, improving the applicability of the invention, and having simple structure and being convenient for large-scale popularization.
Description
Technical Field
The invention relates to the technical field related to sensors, in particular to an ocean electric field sensor.
Background
The electric field sensor is a sensor with good electromagnetic interference resistance and fast response speed. The transient electric field in the high-voltage electric power system can be measured by measuring the electrical variable, and the method can be widely used for detecting the electric field intensity.
Among them, the marine electric field sensor is mainly used for detecting the distribution of the submarine rock stratum structure, which has become one of the main methods of submarine prospecting, in order to ensure the reliability of the signal, it is necessary to ensure a sufficiently large distance between two sensor electrodes, and due to the limitation of the operation conditions in the sea, the large detection distance will result in the weakening of the electric field signal, so the distance between two sensor electrodes of the marine electric field sensor is generally not more than one meter at present.
Because present ocean electric field sensor is when putting in, can't the interval between two sensor electrodes of accurate control for can't be according to actual detection demand in the testing process, adjust the interval between the sensor electrode in real time, present ocean electric field sensor can't adjust in the position in the sea moreover, make can't adjust the position the very first time after receiving the interference in ocean electric field testing process.
Disclosure of Invention
The object of the present invention is to provide an ocean electric field sensor for overcoming the above mentioned drawbacks of the prior art.
The ocean electric field sensor comprises two submerged buoyancy tanks which are arranged in bilateral symmetry, wherein a floating and submerging assembly is arranged in each submerged buoyancy tank, a power box is arranged between the submerged buoyancy tanks on the left side and the right side, and sensor electrodes are fixed on the lower side surfaces of the submerged buoyancy tanks;
the floating and diving assembly comprises a buoyancy adjusting block arranged in the floating tank, a buoyancy cavity with an upward opening is arranged in the floating tank, a pair of sliding pairs is formed between the buoyancy adjusting block and the buoyancy cavity, a threaded sleeve cavity is communicated and arranged at the lower side of the buoyancy cavity, a threaded sleeve is fixed on the lower end wall of the buoyancy adjusting block, a threaded cavity which extends downwards and penetrates through the threaded sleeve to the downward opening is arranged in the buoyancy adjusting block, a lead screw is rotationally matched with the lower end wall of the threaded sleeve cavity, the upper side part of the lead screw extends upwards into the threaded cavity, the lead screw is in threaded fit connection with the threaded cavity, and the floating and diving assembly is used for floating or diving of the floating tank.
Preferably, the helical gear chamber is arranged on the lower side of the threaded sleeve chamber, a spline sleeve which runs through the submersible buoyancy tank and the helical gear chamber from left to right is arranged in the submersible buoyancy tank in a rotation fit mode, a spline shaft is arranged in the spline sleeve in a spline fit mode, a driving helical gear which is located in the helical gear chamber is fixed on the spline sleeve, the lower side portion of the screw rod extends downwards into the helical gear chamber, a driven helical gear which is meshed with the driving helical gear is fixed at the tail end of the lower side of the screw rod, the screw rod rotates to drive the buoyancy adjusting block to move up and down, so that the space of the buoyancy chamber is changed, the buoyancy of the submersible buoyancy tank is changed, and the submersible buoyancy tank floats upwards and submerges.
Preferably, a guide rod cavity which is communicated with the left and the right is arranged in the diving buoyancy tank, the guide rod cavity is located on the lower side of the spline sleeve, a guide rod is arranged in the guide rod cavity in a sliding fit mode, the guide rod extends outwards to the outside of the diving buoyancy tank, an adjusting rod seat is fixed on the end face, far away from the power box, of one side of the guide rod, an adjusting rod cavity which is communicated with the front and the back is arranged in the guide rod, an interval adjusting rod which is in threaded fit with the end walls of the front and the back of the guide rod cavity is arranged in the adjusting rod cavity, and the diving buoyancy tank can be driven to move left and right through rotation of the interval adjusting rod.
Preferably, a bevel gear cavity is arranged in the power box, the inner side end face of the guide rod is fixed on the outer side end face of the power box, a motor fixedly connected with the power box is arranged on the upper side of the bevel gear cavity, a motor shaft extending downwards into the bevel gear cavity is fixed on the lower end face of the motor, a shaft sleeve located in the bevel gear cavity is in spline fit on the motor shaft, driving bevel gears which are symmetrical up and down are fixed on the shaft sleeve, a magnetic seat is fixed at the tail end of the upper side of the shaft sleeve, an electromagnet rotationally matched with the motor shaft is fixed in the upper end wall of the bevel gear cavity, a spring is fixed between the electromagnet and the magnetic seat, and the driving bevel gears can be driven to move up and down through the power loss of the electromagnet.
Preferably, one side of the spline shaft, which is close to the power box, extends into the bevel gear cavity in the direction close to the power box, an upper bevel gear which can be meshed with the upper driving bevel gear is fixed at the tail end of one side of the spline shaft, which is close to the power box, and the upper bevel gear is driven to rotate by the upper driving bevel gear, so that the up-and-down motion of the buoyancy regulating block can be realized, and the floating and submerging of the submerging and submerging box can be realized.
Preferably, the distance adjusting rod is close to one side direction part of the power box and extends into the bevel gear cavity in the direction close to one side of the power box, a lower bevel gear which can be meshed with the lower driving bevel gear is fixed at the tail end of one side of the distance adjusting rod close to the power box, the lower bevel gear is driven by the driving bevel gear of the lower side to rotate, the distance between the left sensor electrode and the right sensor electrode can be changed, and accordingly the ocean electric field detection requirements under different conditions are met.
The invention has the beneficial effects that: the invention changes the total density through the up-and-down movement of the buoyancy adjusting block, thereby realizing the ascending and descending of the submerged buoyancy tanks, so that the invention can detect the ocean electric field intensity at different depths, and simultaneously, the submerged buoyancy tanks at the left side and the right side are close to or far away by utilizing the rotation of the spacing adjusting rod, thereby changing the spacing between the sensor electrodes at the left side and the right side, thereby meeting the detection requirements under different conditions, improving the applicability of the invention, having simple structure and being convenient for large-scale popularization.
Drawings
FIG. 1 is a schematic external view of the present invention;
FIG. 2 is a schematic diagram of the overall structure of an ocean electric field sensor of the present invention;
FIG. 3 is an enlarged, fragmentary schematic view of the power box assembly of FIG. 2 in accordance with the present invention;
FIG. 4 is an enlarged, fragmentary, schematic view of the submersible pontoon assembly of FIG. 2 according to the invention;
fig. 5 is a schematic view of a-a of fig. 4 in accordance with the present invention.
In the figure:
10. submerging the buoyancy tank; 11. a buoyancy chamber; 12. a sensor electrode; 13. a helical gear cavity; 14. a threaded sleeve cavity; 20. a buoyancy adjusting block; 21. a spline shaft; 22. a threaded sleeve; 23. a screw rod; 24. a driven helical gear; 25. a driving bevel gear; 26. a threaded cavity; 27. a spline housing; 30. a power box; 40. a motor; 42. an electromagnet; 43. a spring; 44. a magnetic base; 45. an upper bevel gear; 46. a shaft sleeve; 47. a motor shaft; 48. a bevel gear cavity; 49. a drive bevel gear; 50. a spacing adjustment rod; 51. an adjusting rod seat; 52. a guide bar; 53. an adjustment rod cavity; 54. a guide rod cavity; 55. a lower bevel gear.
Detailed Description
For purposes of making the objects and advantages of the present invention more apparent, the following detailed description of the invention, taken in conjunction with the examples, should be understood that the following text is only intended to describe one or several specific embodiments of the invention, and not to strictly limit the scope of the invention as specifically claimed, and as used herein, the terms up, down, left and right are not limited to their strict geometric definitions, but rather include tolerances for reasonable and inconsistent machining or human error, the following detailed description of which is intended to be exhaustive:
referring to fig. 1 to 5, an ocean electric field sensor according to an embodiment of the present invention includes two symmetrically disposed submerged pontoons 10, wherein: a floating and diving component is arranged in the diving and floating box 10, a power box 30 is arranged between the diving and floating box 10 on the left side and the right side, and a sensor electrode 12 is fixed on the lower side surface of the diving and floating box 10;
the floating and diving assembly comprises a buoyancy adjusting block 20 arranged in the floating tank 10, a buoyancy cavity 11 with an upward opening is arranged in the floating tank 10, a pair of sliding pairs is formed between the buoyancy adjusting block 20 and the buoyancy cavity 11, a threaded sleeve cavity 14 is communicated with the lower side of the buoyancy cavity 11, a threaded sleeve 22 is fixed on the lower end wall of the buoyancy adjusting block 20, a threaded cavity 26 which extends downwards and penetrates through the threaded sleeve 22 to the downward opening is arranged in the buoyancy adjusting block 20, a lead screw 23 is rotationally matched with the lower end wall of the threaded sleeve cavity 14, the upper side part of the lead screw 23 extends upwards into the threaded cavity 26, the lead screw 23 is in threaded matching connection with the threaded cavity 26, and the floating and diving assembly is used for floating or diving of the floating tank 10.
In the present invention: a helical gear cavity 13 is arranged at the lower side of the threaded sleeve cavity 14, a spline sleeve 27 which penetrates through the submerged buoyancy tank 10 and the helical gear cavity 13 from left to right is rotationally matched in the submerged buoyancy tank 10, spline housing 27 is spline-fitted with spline shaft 21 inside, so that regardless of the position of spline housing 27 on spline shaft 21, the spline shafts 21 can drive the spline housing 27 to rotate, the spline housing 27 is fixed with a driving helical gear 25 positioned in the helical gear cavity 13, the lower part of the screw rod 23 extends downwards into the helical gear cavity 13, the lower end of the screw rod 23 is fixed with a driven helical gear 24 engaged with the driving helical gear 25, the lead screw 23 rotates to drive the buoyancy adjusting block 20 to move up and down, so that the space of the buoyancy cavity 11 is changed, and further, the buoyancy force applied to the submerged buoyancy tank 10 is changed, so that the submerged buoyancy tank 10 floats up and submerges.
In the present invention: a guide rod cavity 54 which is through from left to right is arranged in the submerged buoyancy tank 10, the guide rod cavity 54 is located on the lower side of the spline sleeve 27, a guide rod 52 is in sliding fit in the guide rod cavity 54, the guide rod 52 plays a guiding role, the guide rod cavity 54 can slide on the guide rod 52, the guide rod 52 extends outwards to the outside of the submerged buoyancy tank 10, an adjusting rod seat 51 is fixed on the end face of one side, away from the power box 30, of the guide rod 52, a front-back through adjusting rod cavity 53 is arranged in the guide rod 52, a distance adjusting rod 50 which is in threaded fit with the end walls of the front side and the rear side of the guide rod cavity 54 is arranged in the adjusting rod cavity 53, and the submerged buoyancy tank 10 can be driven to move from left to right through rotation of the distance adjusting rod 50.
In the present invention: be equipped with bevel gear chamber 48 in the headstock 30, the 52 medial surface of guide bar is fixed in on the headstock 30 outside terminal surface, bevel gear chamber 48 upside be equipped with headstock 30 fixed connection's motor 40, the terminal surface is fixed with downwardly extending to motor shaft 47 in the bevel gear chamber 48, spline fit has on the motor shaft 47 is located shaft sleeve 46 in the bevel gear chamber 48, be fixed with the drive bevel gear 49 of longitudinal symmetry on the shaft sleeve 46, shaft sleeve 46 upside end is fixed with magnetic base 44, bevel gear chamber 48 upper end wall internal fixation have with motor shaft 47 normal running fit's electro-magnet 42, electro-magnet 42 with be fixed with spring 43 between the magnetic base 44, through getting of electro-magnet 42 loses the electricity and can drive bevel gear 49 up-and-down motion.
In the present invention: the part of the spline shaft 21 close to the power box 30 extends into the bevel gear cavity 48 towards the direction close to the power box 30, an upper bevel gear 45 capable of being meshed with the upper driving bevel gear 49 is fixed at the tail end of the spline shaft 21 close to the power box 30, the upper driving bevel gear 49 drives the upper bevel gear 45 to rotate, the up-and-down motion of the buoyancy adjusting block 20 can be realized, and the floating and submerging of the submerging and submerging box 10 are realized.
In the present invention: the distance adjusting rod 50 is close to one side direction part of the power box 30 and extends to the bevel gear cavity 48 in the direction close to one side of the power box 30, the tail end of one side, close to the power box 30, of the distance adjusting rod 50 is fixedly provided with a lower bevel gear 55 which can be meshed with the driving bevel gear 49 on the lower side, the driving bevel gear 49 on the lower side drives the lower bevel gear 55 to rotate, the distance between the left sensor electrode 12 and the right sensor electrode 12 can be changed, and therefore the ocean electric field detection requirements under different conditions are met.
The invention relates to an ocean electric field sensor, which comprises the following working procedures:
the sensor electrode 12 is started, the invention is placed in the sea, and because the upper side surface of the buoyancy adjusting block 20 is flush with the outer circular surface of the submerged buoyancy tank 10 in the initial state, the space at the lower side of the buoyancy adjusting block 20 is in the maximum state, the driving bevel gear 49 at the lower side is meshed with the lower bevel gear 55, and the driving bevel gear 49 at the upper side is meshed with the upper bevel gear 45.
At this time, the left and right submerged buoyancy tanks 10 float on the sea surface due to the buoyancy of the seawater applied to the submerged buoyancy tanks 10.
If the diving buoyancy tank 10 is to be submerged into the sea, the electromagnet 42 is remotely controlled to be started through a remote control device, so that the electromagnet 42 electrically attracts the magnetic seat 44, the magnetic seat 44 overcomes the elastic force of the spring 43 to move upwards, the shaft sleeve 46 is driven to move upwards, the driving bevel gear 49 on the upper side moves upwards to be meshed with the upper bevel gear 45, and the driving bevel gear 49 on the lower side moves upwards to be disengaged from the lower bevel gear 55.
Then the motor 40 is started, so that the motor 40 drives the motor shaft 47 to rotate, thereby the driving bevel gear 49 rotates, the driving bevel gear 49 on the upper side drives the upper bevel gear 45 to rotate, further the spline shaft 21 rotates, further the spline housing 27 rotates, further the driving bevel gear 25 rotates, further the driven bevel gear 24 rotates, further the screw rod 23 rotates, further the threaded sleeve 22 is driven to move downwards, further the buoyancy adjusting block 20 moves downwards, the space below the buoyancy adjusting block 20 is reduced, further the overall density of the submerged buoyancy tank 10 is increased, the buoyancy force applied to the submerged buoyancy tank 10 is reduced, and therefore the purpose that the submerged buoyancy tank 10 moves downwards to the sea is achieved.
After the specified depth is reached, the electromagnet 42 and the motor 40 are turned off, the submerged floating box 10 stops moving downwards, and the distance of the downward movement of the submerged floating box 10 can be controlled by adjusting the distance of the downward movement of the buoyancy adjusting block 20.
The electric field intensity in the ocean is detected by the left and right sensor electrodes 12.
In order to ensure signal reliability, the distance between the left and right sensor electrodes 12 needs to be large enough, and the electric field signal is weakened by increasing the distance between the left and right due to the operation condition limitation in the sea, so that the distance between the left and right sensor electrodes 12 needs to be adjusted according to the actual situation.
At this time, the motor 40 is started to drive the driving bevel gear 49 to rotate, and since the electromagnet 42 is in a closed state, the driving bevel gear 49 on the upper side is not engaged with the upper bevel gear 45, and the driving bevel gear 49 on the lower side is engaged with the lower bevel gear 55, so that the driving bevel gear 49 on the lower side drives the lower bevel gear 55 to rotate, and further drives the spacing adjustment rod 50 to rotate, and further the left and right side pontoons 10 are made to approach each other, until a specified spacing is reached, the motor 40 is turned off, and then the left and right side pontoons 10 stop moving.
At this time, the right and left sensor electrodes 12 start normal detection operation.
It will be apparent to those skilled in the art that various modifications may be made to the above embodiments without departing from the general spirit and concept of the invention. All falling within the scope of protection of the present invention. The protection scheme of the invention is subject to the appended claims.
Claims (1)
1. The utility model provides an ocean electric field sensor, includes two bilateral symmetry's latent flotation tank (10) that set up, its characterized in that: a floating and diving component is arranged in the diving and floating box (10), a power box (30) is arranged between the diving and floating box (10) on the left side and the right side, and a sensor electrode (12) is fixed on the lower side surface of the diving and floating box (10);
the floating and submerging component comprises a buoyancy regulating block (20) arranged in the submerging buoyancy tank (10), a buoyancy cavity (11) with an upward opening is arranged in the submerged buoyancy tank (10), a pair of sliding pairs is formed between the buoyancy adjusting block (20) and the buoyancy cavity (11), a thread sleeve cavity (14) is communicated and arranged at the lower side of the buoyancy cavity (11), a thread sleeve (22) is fixed on the lower end wall of the buoyancy adjusting block (20), a thread cavity (26) which extends downwards to penetrate through the thread sleeve (22) to be opened downwards is arranged in the buoyancy adjusting block (20), a screw rod (23) is rotationally matched with the lower end wall of the threaded sleeve cavity (14), the upper side part of the screw rod (23) extends upwards into the threaded cavity (26), the screw rod (23) is in threaded fit connection with the threaded cavity (26), and the floating and submerging assembly is used for floating or submerging the submerged buoyancy tank (10);
a helical gear cavity (13) is arranged on the lower side of the threaded sleeve cavity (14), a spline housing (27) which penetrates through the submersible buoyancy tank (10) and the helical gear cavity (13) from left to right is in rotating fit with the submersible buoyancy tank (10), a spline shaft (21) is in spline fit with the spline housing (27), a driving helical gear (25) which is located in the helical gear cavity (13) is fixed on the spline housing (27), the lower side part of the screw rod (23) extends downwards into the helical gear cavity (13), and a driven helical gear (24) which is meshed with the driving helical gear (25) is fixed at the tail end of the lower side of the screw rod (23);
a guide rod cavity (54) which is through from left to right is arranged in the submerged buoyancy tank (10), the guide rod cavity (54) is located on the lower side of the spline sleeve (27), a guide rod (52) is in sliding fit in the guide rod cavity (54), the guide rod (52) extends outwards to the outside of the submerged buoyancy tank (10), an adjusting rod seat (51) is fixed on the end face of one side, away from the power box (30), of the guide rod (52), an adjusting rod cavity (53) which is through from front to back is arranged in the guide rod (52), and a spacing adjusting rod (50) which is in threaded fit with the end walls on the front side and the rear side of the guide rod cavity (54) is arranged in the adjusting rod cavity (53);
a bevel gear cavity (48) is arranged in the power box (30), the end surface of the inner side of the guide rod (52) is fixed on the end surface of the outer side of the power box (30), a motor (40) fixedly connected with the power box (30) is arranged on the upper side of the bevel gear cavity (48), a motor shaft (47) which extends downwards into the bevel gear cavity (48) is fixed on the lower end surface of the motor (40), a shaft sleeve (46) positioned in the bevel gear cavity (48) is matched on the motor shaft (47) in a spline way, a driving bevel gear (49) which is symmetrical up and down is fixed on the shaft sleeve (46), a magnetic seat (44) is fixed at the tail end of the upper side of the shaft sleeve (46), an electromagnet (42) which is in rotating fit with the motor shaft (47) is fixed in the upper end wall of the bevel gear cavity (48), a spring (43) is fixed between the electromagnet (42) and the magnetic seat (44);
the part of one side, close to the power box (30), of the spline shaft (21) extends into the bevel gear cavity (48) in the direction of one side, close to the power box (30), of the spline shaft (21), and an upper bevel gear (45) capable of being meshed with the driving bevel gear (49) on the upper side is fixed at the tail end of one side, close to the power box (30), of the spline shaft (21);
the distance adjusting rod (50) is close to one side direction part of the power box (30) and extends to the bevel gear cavity (48) in the direction close to one side of the power box (30), and a lower bevel gear (55) which can be meshed with the driving bevel gear (49) on the lower side is fixed at the tail end of one side, close to the power box (30), of the distance adjusting rod (50).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111231333.1A CN113671583B (en) | 2021-10-22 | 2021-10-22 | Ocean electric field sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111231333.1A CN113671583B (en) | 2021-10-22 | 2021-10-22 | Ocean electric field sensor |
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| Publication Number | Publication Date |
|---|---|
| CN113671583A CN113671583A (en) | 2021-11-19 |
| CN113671583B true CN113671583B (en) | 2021-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111231333.1A Active CN113671583B (en) | 2021-10-22 | 2021-10-22 | Ocean electric field sensor |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2645473A1 (en) * | 2006-03-15 | 2007-09-20 | Advanced Hydrocarbon Mapping As | Electric field sensor for marine environments |
| CN102030086A (en) * | 2010-07-30 | 2011-04-27 | 华中科技大学 | Buoyancy regulating device |
| CN110758699A (en) * | 2019-11-19 | 2020-02-07 | 博雅工道（北京）机器人科技有限公司 | Piston type floating and submerging mechanism and underwater equipment |
| CN111323829A (en) * | 2020-04-02 | 2020-06-23 | 青岛海洋科学与技术国家实验室发展中心 | Ocean electromagnetic detector |
| CN112346145A (en) * | 2020-11-12 | 2021-02-09 | 福清市凯联电子科技有限公司 | Underwater detection device convenient to fix accurate location |
| CN113036518A (en) * | 2021-02-28 | 2021-06-25 | 南京帕米歌数码科技有限公司 | Underwater protection device of underwater photoelectric connector capable of floating upwards |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8134369B2 (en) * | 2009-04-28 | 2012-03-13 | Kjt Enterprises, Inc. | Method of testing electric field recording of a marine electromagnetic sensor cable |
-
2021
- 2021-10-22 CN CN202111231333.1A patent/CN113671583B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2645473A1 (en) * | 2006-03-15 | 2007-09-20 | Advanced Hydrocarbon Mapping As | Electric field sensor for marine environments |
| CN102030086A (en) * | 2010-07-30 | 2011-04-27 | 华中科技大学 | Buoyancy regulating device |
| CN110758699A (en) * | 2019-11-19 | 2020-02-07 | 博雅工道（北京）机器人科技有限公司 | Piston type floating and submerging mechanism and underwater equipment |
| CN111323829A (en) * | 2020-04-02 | 2020-06-23 | 青岛海洋科学与技术国家实验室发展中心 | Ocean electromagnetic detector |
| CN112346145A (en) * | 2020-11-12 | 2021-02-09 | 福清市凯联电子科技有限公司 | Underwater detection device convenient to fix accurate location |
| CN113036518A (en) * | 2021-02-28 | 2021-06-25 | 南京帕米歌数码科技有限公司 | Underwater protection device of underwater photoelectric connector capable of floating upwards |
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| CN113671583A (en) | 2021-11-19 |
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