Self-anchoring device for submarine cable in-situ observation system

Abstract

The present invention relates to the technical field of subsea observation equipment, in particular to a self-anchoring fixing device for a subsea cable-based in-line observation system. It includes a locking buckle and a self-anchoring mechanism. The two sides of the bottom of the locking buckle are respectively connected with the self-anchoring mechanism, and the self-anchoring mechanisms on both sides of the locking buckle are symmetrically arranged. The locking buckle is fixed on the outside of the electro-optical composite cable; the upper end of the first connecting rod of the self-anchoring mechanism is rotatably connected with the locking buckle, the lower end of the first connecting rod is rotatably connected with the top surface of the bottom rod, the bottom rod is arranged along the axial direction of the electro-optical composite cable, a counter-disturbance rod is fixed in the middle of the bottom of the bottom rod, and anchoring parts are respectively fixed at the bottoms of both ends of the bottom rod along the axial direction. It can ensure that the subsea cable and the subsea observation system can be adaptively and firmly fixed on the shallow surface of the seabed, while allowing a certain amount of displacement to occur to ensure that the subsea cable is not pulled and damaged; when laying the subsea cable through this device, there is no need to excavate the seabed on a large area, and the environmental damage is minimal.

Description

Technical Field

[0001] The present invention relates to the technical field of subsea observation equipment, in particular to a self-anchoring fixing device for a subsea cabled in-situ observation system. Background Art

[0002] Existing marine monitoring technologies (self-contained in-situ observation) are restricted by energy supply and data transmission and cannot achieve long-term real-time online monitoring. Therefore, the subsea cabled in-situ observation method has emerged. The subsea cabled in-situ observation system can integrate various observation instruments such as multi-parameter sensors and underwater high-definition cameras to achieve in-situ online observation of various marine environmental elements in the ocean, such as temperature, salinity, depth, dissolved oxygen, chlorophyll, turbidity, and ocean current. At the same time, it can perform online analysis on the observed data and videos to realize early warning of the ecological environment and online statistics of marine fish resources, truly realizing visual, measurable, and controllable monitoring of the subsea ecological environment.

[0003] Currently, the subsea cabled in-situ observation system mainly consists of several parts such as a subsea observation platform, a power and information transmission system, a shore-based control system, and a data display and analysis system. Among them, the subsea observation platform is fixed to the seabed through a specially designed subsea platform. Its function is to integrate and carry sensor devices such as hydrological and water quality element sensors and underwater video observation systems to avoid the influence of surface sea waves and passing ships on the instruments during the observation process and ensure stable in-situ online observation. The function of the power and information transmission system is to connect the subsea observation platform and the shore-based control system to achieve stable power supply for underwater observation equipment and at the same time transmit the observed data to the shore-based control system to achieve high-bandwidth long-distance transmission of the observed data. The shore-based control system transmits the data to the general control center through the network. At the same time, the shore-based control system can send the control instructions of the general control center to the subsea observation platform through the subsea cable.

[0004] The existing subsea cabled in-situ observation systems have the following many deficiencies:

[0005] First of all, the current subsea cabled in-situ observation systems mainly focus on software technology development, and there is relatively little technical research on the key equipment components of subsea cabled in-situ observation under complex subsea environmental conditions. As an important carrier of software, the reliability of hardware is very important. The hardware of the observation equipment requires a high level of underwater safety protection to ensure the normal operation of the overall system. The subsea environment is complex. As the main carrier of the power information transmission system, subsea cables are faced with the nibbling of marine animals and the collision with rocks under the scouring of subsea ocean currents. Subsea cables are extremely prone to wear and damage. Especially for topographies such as large boulder fields, exposed subsea rocks, subsea canyons, and steep slopes that are likely to cause the free suspension of subsea cables, when the hanging or suspended length of the subsea cable in steep terrains such as steep slopes is too long, it will swing left and right under the influence of water flow and surges. Under the continuous action of alternating displacement, the cable will be damaged and worn in the stress concentration area, and then insulation damage and breakdown will occur.

[0006] Secondly, the current construction of subsea optical cables requires the excavation of trenches for burying subsea optical cables. First, the excavation and laying costs are huge. Once the optical cable fails, it is necessary to dig up the cable again, which is very costly. Second, the excavation of subsea trenches will damage the subsea ecological environment, especially for fragile ecological sea areas, the damage is irreversible. Summary of the Invention

[0007] The purpose of the present invention is to overcome the above-mentioned defects existing in the prior art, and to propose a self-anchoring fixing device for a subsea cabled in-situ observation system, which can ensure that the subsea cable and the subsea observation system can be adaptively and flexibly fixed firmly on the shallow surface of the seabed, and at the same time allow a certain displacement to occur to ensure that the subsea cable is not pulled and damaged; when laying the subsea cable through this device, there is no need to excavate the seabed on a large scale, and the environmental damage is minimal.

[0008] The technical solution of the present invention is: a self-anchoring fixing device for a subsea cabled in-situ observation system, which includes a locking buckle and a self-anchoring mechanism. The two sides of the bottom of the locking buckle are respectively connected with a self-anchoring mechanism, and the self-anchoring mechanisms on both sides of the locking buckle are symmetrically arranged. The locking buckle is fixed on the outside of the electro-optical composite cable;

[0009] The self-anchoring mechanism includes a first connecting rod, a connecting rotating shaft, a bottom rod, an anti-disturbance rod fixedly connected to the middle of the bottom rod, and an anchoring part fixedly connected to both ends of the connecting bottom rod. The upper end of the first connecting rod is rotationally connected to the locking buckle through a rotating shaft, the lower end of the first connecting rod is rotationally connected to the top surface of the bottom rod through a connecting rotating shaft, the bottom rod is arranged along the axial direction of the electro-optical composite cable, an anti-disturbance rod is fixed in the middle of the bottom of the bottom rod, and anchoring parts are respectively fixed at the bottom of both ends of the bottom rod along the axial direction;

[0010] The anchoring part includes a first fixing rod, a second fixing rod, a rotatable rod and a secondary hook. The first fixing rod is arranged vertically. The top end of the first fixing rod is fixedly connected to the bottom surface of the bottom rod, and the bottom end of the first fixing rod is fixedly connected to the top end of the second fixing rod. The first fixing rod and the second fixing rod are arranged obliquely. The second fixing rod faces away from the optical and electrical composite cable and its bottom faces the seabed. The bottom end of the second fixing rod is rotatably connected to the rotatable rod through a rotating shaft. The hinge point between the second fixing rod and the rotatable rod divides the rotatable rod into a long section and a short section. A thrust plate is fixedly arranged on the upper surface of the rotatable rod near the hinge point and on the side facing the short section. The thrust plate is perpendicular to the rotatable rod. A secondary hook is perpendicularly fixed to the bottom surface at the end of the long section of the rotatable rod. The secondary hook is arranged away from the optical and electrical composite cable. The bottom end position of the anti-disturbance rod is lower than the bottom end of the rotatable rod.

[0011] In the present invention, the top of the anti-disturbance rod is fixedly connected to the bottom surface of the bottom rod, and the bottom of the anti-disturbance rod is in a conical tip shape.

[0012] The locking buckle shown includes an upper buckle and a lower buckle. Arc-shaped grooves are provided on the bottom of the upper buckle and the top of the lower buckle. When the upper buckle and the lower buckle are fixedly connected, the arc-shaped grooves of the upper buckle and the lower buckle form an annular cavity, and the optical and electrical composite cable is arranged in this annular cavity. One side of the bottom of the upper buckle is rotatably connected to one side of the top of the lower buckle through a rotating connection shaft, and the other side of the bottom of the upper buckle is fixedly connected to the other side of the top of the upper buckle through a fixed connecting piece.

[0013] The fixed connecting piece includes a first screw rod, a locking rotating rod and a second screw rod. The locking rotating rod is located between the first screw rod and the second screw rod. Two vertically penetrating threaded holes are provided in the upper buckle. The first screw rod and the second screw rod are respectively arranged in the threaded holes. Correspondingly, a first locking hole and a second locking hole are provided on the top surface of the lower buckle, and a threaded groove is provided on the top surface of the upper buckle. The threaded groove is located between the two threaded holes. The locking rotating rod is arranged in the threaded groove. Threads are provided on the outer surfaces of the locking rotating rod, the first screw rod and the second screw rod, and the threads between the first screw rod and the locking rotating rod are engaged with each other, and the threads between the second screw rod and the locking rotating rod are engaged with each other. A concave groove is provided on the top surface of the locking rotating rod.

[0014] Rotating shafts are symmetrically provided on both sides of the bottom of the lower buckle, and a limiting groove is provided at the bottom of the lower buckle. The upper end of the first connecting rod is rotatably connected to the lower buckle through the rotating shaft.

[0015] The angle between the first fixing rod and the second fixing rod is 120°.

[0016] The beneficial effects of the present invention are:

[0017] (1) Through this device, it can ensure that the submarine cable can be adaptively and firmly fixed on the shallow surface of the seabed. Under the action of ocean currents and sedimentation, it can be more tightly "compacted" on the seabed surface and will not produce large displacements;

[0018] (2) This device plays a supporting role for the submarine cable, ensuring that the submarine cable has characteristics such as anti-trawl, anti-ship anchor impact, anti-burial, and anti-overturning;

[0019] (3) When laying the submarine cable through this device, there is no need to excavate the seabed on a large scale, and the damage to the seabed ecological environment is minimal, making it very suitable for application in fragile ecological areas such as coral reef protection areas;

[0020] (4) This self-anchoring device can also be used for submarine observation platforms. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0022] Figure 2 is a structural schematic diagram of the locking buckle;

[0023] Figure 3 is a structural schematic diagram of the connection between the locking buckle and the self-anchoring mechanism;

[0024] Figure 4 is a cross-sectional structural schematic diagram of the first lead screw, the locking rotating rod, and the second lead screw;

[0025] Figure 5 is a structural schematic diagram of the self-anchoring mechanism;

[0026] Figure 6 is a structural schematic diagram at the thrust plate;

[0027] Figure 7 is a front view structural schematic diagram of the present invention.

[0028] In the figure: 1 optoelectronic composite cable; 2 locking buckle; 3 self-anchoring mechanism; 4 upper buckle; 5 rotating connection shaft; 6 lower buckle; 7 first lead screw; 8 locking rotating rod; 9 second lead screw; 10 first locking hole; 11 second locking hole; 12 rotating shaft; 13 limiting groove; 14 first connecting rod; 15 connecting rotating shaft; 16 bottom rod; 17 first fixing rod I; 18 second fixing rod I; 19 rotatable rod I; 20 auxiliary hook I; 21 thrust plate I; 22 anti-disturbance rod; 23 first fixing rod II; 24 second fixing rod II; 25 thrust plate II; 26 rotatable rod II; 27 auxiliary hook II; 28 rotating shaft I. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] In order to make the above-mentioned objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the specific embodiments of the present invention will be given in conjunction with the accompanying drawings.

[0030] Specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0031] As Figure 1 shown, during the process of laying the hybrid electro - optical cable 1 on the seabed, several self - anchoring fixing devices of the undersea cable - based on - line observation system of the present invention are arranged at intervals along the axial direction of the hybrid electro - optical cable 1. Through this device, it can be ensured that the undersea cable - based on - line observation system and the undersea cable can be adaptively and flexibly fixed on the shallow surface of the seabed, and can be more tightly fixed on the seabed surface under the action of ocean currents.

[0032] The self - anchoring fixing device of the undersea cable - based on - line observation system of the present invention includes a locking buckle 2 and a self - anchoring mechanism 3. The two sides of the bottom of the locking buckle 2 are respectively connected with the self - anchoring mechanism 3, and the locking buckle 2 is fixed on the outside of the hybrid electro - optical cable 1.

[0033] As Figures 2 to 4 shown, the locking buckle 2 includes an upper buckle 4 and a lower buckle 6. Arc - shaped grooves are provided at the bottom of the upper buckle 4 and the top of the lower buckle 6. When the upper buckle 4 and the lower buckle 6 are fixedly connected, the arc - shaped grooves of the upper buckle and the lower buckle form an annular cavity, and the hybrid electro - optical cable 1 is arranged in this annular cavity. One side of the bottom of the upper buckle 4 is rotatably connected to one side of the top of the lower buckle 6 through a rotating connection shaft 5, and the other side of the bottom of the upper buckle 4 is fixedly connected to the other side of the top of the lower buckle 6 through a fixed connecting piece.

[0034] The fixed connecting piece includes a first lead screw 7, a locking rotating rod 8 and a second lead screw 9. The locking rotating rod 8 is located between the first lead screw 7 and the second lead screw 9. There are two vertically penetrating threaded holes in the upper buckle 4, and the first lead screw 7 and the second lead screw 9 are respectively arranged in the threaded holes. Correspondingly, a first locking hole 10 and a second locking hole 11 are provided on the top surface of the lower buckle 6. A threaded groove is provided on the top surface of the upper buckle 4, and the threaded groove is located between the two threaded holes. The locking rotating rod 8 is arranged in the threaded groove. Trapezoidal threads are provided on the outer surfaces of the locking rotating rod 8, the first lead screw 7 and the second lead screw 9, and the trapezoidal threads between the first lead screw 7 and the locking rotating rod 8 are engaged with each other, and the trapezoidal threads between the second lead screw 9 and the locking rotating rod 8 are engaged with each other. A concave groove is provided on the top surface of the locking rotating rod 8. When an external tool is inserted into the concave groove to make the locking rotating rod 8 rotate, during the rotation of the locking rotating rod 8, through the thread engagement between the locking rotating rod 8 and the first lead screw 7, and the thread engagement between the locking rotating rod 8 and the second lead screw 9, the rotation of the first lead screw 7 and the second lead screw 9 is realized. When the first lead screw 7 and the second lead screw 9 rotate, axial movement will occur. When the bottom of the first lead screw 7 is inserted into the first locking hole 10 of the lower buckle 6 and the bottom of the second lead screw 9 is inserted into the second locking hole 11 of the lower buckle 6, the fixed connection between the upper buckle 4 and the lower buckle 6 can be realized.

[0035] Rotating shafts 12 are symmetrically provided on both sides of the bottom of the lower buckle 6. The two sides of the bottom of the lower buckle 6 are respectively connected to the self-anchoring mechanism, and the two self-anchoring mechanisms are symmetrically arranged. The bottom of the lower buckle 6 is respectively rotatably connected to the self-anchoring mechanism through the rotating shafts 12. A limiting groove 13 is provided at the bottom of the lower buckle 6.

[0036] As Figures 5 to 7 shown, the self-anchoring mechanism includes a first connecting rod 14, a connecting rotating shaft 15, a bottom rod 16, an anti-disturbance rod 22 fixedly connected to the middle of the bottom rod 16, and an anchoring part fixedly connected to both ends of the connecting bottom rod. As Figure 4 and Figure 5 shown, the upper end of the first connecting rod 14 is rotatably connected to the lower buckle 6 through the rotating shaft 12. When the first connecting rod 14 rotates to the limiting groove 13, the limiting groove 13 plays a blocking role on the first connecting rod 14, and the first connecting rod 14 cannot continue to rotate. The lower end of the first connecting rod 14 is rotatably connected to the top surface of the bottom rod 16 through the connecting rotating shaft 15. The bottom rod 16 is arranged along the axis of the optical and electrical composite cable. An anti-disturbance rod 22 is fixed in the middle of the bottom of the bottom rod 16. Anchoring parts are respectively fixed at the bottoms of both ends of the bottom rod 16 along the axis. The anchoring parts in this embodiment include a first anchoring part and a second anchoring part.

[0037] The first anchoring part includes a first fixing rod I17, a second fixing rod I18, a rotatable rod I19 and a secondary hook I20. The first fixing rod I17 is arranged vertically. The top end of the first fixing rod I17 is fixedly connected to the bottom surface of the bottom rod 16. The bottom end of the first fixing rod I17 is fixedly connected to the top end of the second fixing rod I18. The first fixing rod I17 and the second fixing rod I18 are arranged obliquely. The bottom of the second fixing rod I18 faces the seabed and is set away from the optical and electrical composite cable. In this embodiment, the angle between the first fixing rod I17 and the second fixing rod I18 is 120°. The bottom end of the second fixing rod I18 is rotatably connected to the rotatable rod I19 through a rotating shaft I28. The hinge point between the second fixing rod I18 and the rotatable rod I19 divides the rotatable rod I19 into a long section and a short section. A thrust plate I21 is fixedly arranged on the upper surface of the rotatable rod I near the hinge point and on the side facing the short section. The thrust plate I21 is perpendicular to the rotatable rod I. The thrust plate I21 plays a role in limiting the rotation of the rotatable rod I19. A secondary hook I20 is vertically fixed to the bottom surface at the end of the long section of the rotatable rod I19. The secondary hook I20 is arranged away from the optical and electrical composite cable.

[0038] The second anchoring part includes a first fixing rod II23, a second fixing rod II24, a rotatable rod II26 and a secondary hook II27. The first fixing rod II23 is arranged vertically. The top end of the first fixing rod II23 is fixedly connected to the bottom surface of the bottom rod 16. The bottom end of the first fixing rod II23 is fixedly connected to the top end of the second fixing rod II24. The first fixing rod II23 and the second fixing rod II24 are arranged obliquely. The bottom of the second fixing rod II24 faces the seabed and is set away from the optical and electrical composite cable. In this embodiment, the angle between the first fixing rod II23 and the second fixing rod II24 is 120°. The bottom end of the second fixing rod II24 is rotatably connected to the rotatable rod II26 through a rotating shaft II. The hinge point between the second fixing rod II24 and the rotatable rod II26 divides the rotatable rod II26 into a long section and a short section. A thrust plate II25 is fixedly arranged on the upper surface of the rotatable rod II near the hinge point and on the side facing the short section. The thrust plate II25 is perpendicular to the rotatable rod II26. The thrust plate II25 plays a role in limiting the rotation of the rotatable rod II26. A secondary hook II27 is vertically fixed to the bottom surface at the end of the long section of the rotatable rod II26. The secondary hook II27 is arranged away from the optical and electrical composite cable.

[0039] The top of the anti-interference rod 22 is fixedly connected to the bottom surface of the bottom rod 16. The bottom of the anti-interference rod 22 is conical, and the bottom end position of the anti-interference rod 22 is lower than the bottom end of the rotatable rod II26. Therefore, when the device just falls onto the seabed, the conical tip at the bottom of the anti-interference rod first inserts into the seabed mud layer, playing a supporting role for the whole device and keeping the whole device in a vertical state.

[0040] In this application, the first anchoring part and the second anchoring part have the same working principle. Therefore, in this embodiment, the working principle of the first anchoring part will be described in detail. The working principles of the other anchoring parts are the same and will not be elaborated in this embodiment. When the device is in the initial state, the long section of the rotatable rod I 19 is in contact with the bottom surface of the second fixing rod I 18. At this time, multiple such devices are released into the sea water, and the devices gradually fall to the seabed under the action of gravity. The bottom end of the anti-disturbance rod 22 first inserts into the seabed mud layer. At this time, the entire device continues to sink under the gravity of the device. At the same time, since the rotating shaft I 28 divides the rotatable rod I 19 into a long section and a short section, during the sinking process of the device, the rotatable rod I 19 always slowly rotates along the rotating shaft I 28. At this time, the short section of the rotatable rod I 19 gradually rises, and the long section of the rotatable rod I 19 gradually descends. By reasonably setting the position of the rotating shaft I 28, it can be ensured that during the continuous sinking process of the device, the rotatable rod I 19 is always inclined, and the end of the short section of the rotatable rod I 19 first contacts the seabed, and the end of the short section of the rotatable rod I inserts into the seabed mud layer. Then, as time goes by, under the action of stratification, the rotatable rod I 19 continues to slowly rotate along the rotating shaft I 28, and the long section of the rotatable rod I 19 gradually descends. When slight or large changes occur on the seabed, the sediment layer changes. At this time, the long section of the rotatable rod I 19 continues to rotate and descend until the thrust plate I 21 of the rotatable rod I 19 contacts the second fixing rod I 18. At this time, the second fixing rod I 18 and the rotatable rod I 19 are perpendicular to each other, and under the limiting action of the thrust plate I 21, the rotatable rod I 19 cannot continue to rotate. At this time, the secondary hook I 20 at the end of the long section of the rotatable rod I 19 inserts into the seabed mud layer. At this time, under the thrust action of the thrust plate I 21, the second fixing rod I 18 is always in an inclined state, ensuring that the secondary hook I 20 can be inserted into the seabed mud layer, and at the same time, the seabed mud layer above the secondary hook I 20 generates a downward pressure on the secondary hook I 20. As time goes by, more and more seabed sediments are located above the secondary hook I, thereby generating a greater pressure on the secondary hook I, making the secondary hook I pressed tighter and tighter, ensuring that the secondary hook I 20 can be stably inserted into the seabed mud layer.

[0041] The structure of the entire device after it has fallen to the seabed mud layer and stabilized is as Figure 7 shown, and the self-anchoring mechanisms on both sides of the optoelectronic composite cable are symmetrically arranged, thus realizing the self-anchoring of the entire device.

[0042] When using this device for subsea laying of the fiber optic composite cable, first, several such devices are fixedly arranged at intervals along the axial direction of the fiber optic composite cable 1. By rotating the connecting shaft 5, the upper buckle 4 and the lower buckle 6 rotate relative to each other. Place the fiber optic composite cable in the groove between the upper buckle and the lower buckle. Then rotate the locking rotating rod 8 to make the first lead screw 7 move downward into the first locking hole 10 and make the second lead screw 9 move downward into the second locking hole 11, thereby fixing the upper buckle 4 and the lower buckle 6 on the outer surface of the fiber optic composite cable 1. Then release the fiber optic composite cable with this device in seawater. Under the action of gravity, the fiber optic composite cable and several devices gradually sink. When each anchoring part in the self-anchoring mechanism contacts the seabed, the anti-disturbance rod in the anchoring part first inserts into the seabed mud layer, playing a supporting role for the whole device and making the whole device in the vertical direction. Then during the rotation of the rotatable rod, the secondary hook of its long section gradually inserts into the seabed mud layer to fix the whole device on the seabed bottom layer.

[0043] The above has introduced in detail the self-anchoring fixing device of the subsea cable-based in-line observation system provided by the present invention. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention. The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An in - cable on - line observation system self - anchoring fixing device for the seabed, characterized in that, It includes a locking buckle (2) and a self-anchoring mechanism (3). The two sides of the bottom of the locking buckle (2) are respectively connected with the self-anchoring mechanism (3), and the self-anchoring mechanisms on both sides of the locking buckle are symmetrically arranged. The locking buckle (2) is fixed on the outer side of the optical and electrical composite cable (1). The self-anchoring mechanism includes a first connecting rod (14), a connecting rotating shaft (15), a bottom rod (16), an anti-disturbance rod (22) fixedly connected to the middle of the bottom rod (16), and an anchoring part. The upper end of the first connecting rod (14) is rotatably connected to the locking buckle (2), the lower end of the first connecting rod (14) is rotatably connected to the top surface of the bottom rod (16). The bottom rod (16) is arranged along the axial direction of the optical and electrical composite cable. The middle of the bottom of the bottom rod (16) is fixed with an anti-disturbance rod (22), and the bottom parts of both ends of the bottom rod (16) along the axial direction are respectively fixed with an anchoring part. The anchoring part includes a first fixing rod, a second fixing rod, a rotatable rod and a secondary hook. The first fixing rod is arranged in the vertical direction. The top end of the first fixing rod is fixedly connected to the bottom surface of the bottom rod. The bottom end of the first fixing rod is fixedly connected to the top end of the second fixing rod. The first fixing rod and the second fixing rod are arranged obliquely. The second fixing rod faces away from the optical and electrical composite cable and its bottom faces the seabed direction. The bottom end of the second fixing rod is rotatably connected to the rotatable rod. The hinge point between the second fixing rod and the rotatable rod divides the rotatable rod into a long section and a short section. A thrust plate is fixedly connected to the upper surface of the rotatable rod near the hinge point and on the side facing the short section. The thrust plate is perpendicular to the rotatable rod. A secondary hook is perpendicularly fixed to the bottom surface at the end of the long section of the rotatable rod. The secondary hook is arranged away from the optical and electrical composite cable. The bottom end position of the anti-disturbance rod is lower than the bottom end of the rotatable rod.

2. The self-anchoring fixing device of the undersea cable in-line observation system according to claim 1, characterized in that, The top of the anti-disturbance rod (22) is fixedly connected to the bottom surface of the bottom rod (16), and the bottom of the anti-disturbance rod (22) is in a conical tip shape.

3. The self-anchoring fixing device of the submarine cable in-line observation system according to claim 1, characterized in that, The locking buckle (2) shown includes an upper buckle (4) and a lower buckle (6). Arc-shaped grooves are provided on the bottom of the upper buckle (4) and the top of the lower buckle (6). When the upper buckle (4) and the lower buckle (6) are fixedly connected, the arc-shaped grooves of the upper buckle and the lower buckle form an annular cavity, and the optical and electrical composite cable (1) is arranged in this annular cavity. One side of the bottom of the upper buckle (4) is rotatably connected to one side of the top of the lower buckle (6) through a rotating connection shaft (5), and the other side of the bottom of the upper buckle (4) is fixedly connected to the other side of the top of the lower buckle (6) through a fixed connecting piece.

4. The self-anchoring fixing device of the submarine cabled in-situ observation system according to claim 3, characterized in that, The fixed connecting piece includes a first screw rod (7), a locking rotating rod (8) and a second screw rod (9). The locking rotating rod (8) is located between the first screw rod (7) and the second screw rod (9). There are two vertically penetrating threaded holes in the upper buckle (4). The first screw rod (7) and the second screw rod (9) are respectively arranged in the threaded holes. Correspondingly, a first locking hole (10) and a second locking hole (11) are provided on the top surface of the lower buckle (6). A threaded groove is provided on the top surface of the upper buckle (4), and the threaded groove is located between the two threaded holes. The locking rotating rod (8) is arranged in the threaded groove. Threads are provided on the outer surfaces of the locking rotating rod (8), the first screw rod (7) and the second screw rod (9), and the threads between the first screw rod (7) and the locking rotating rod (8) are engaged with each other, and the threads between the second screw rod (9) and the locking rotating rod (8) are engaged with each other. A concave groove is provided on the top surface of the locking rotating rod (8).

5. The self-anchoring and fixing device of the submarine cabled in-situ observation system according to claim 3, wherein Rotating shafts (12) are symmetrically provided on both sides of the bottom of the lower buckle (6), and a limiting groove (13) is provided at the bottom of the lower buckle (6). The upper end of the first connecting rod (14) is rotatably connected to the lower buckle (6) through the rotating shaft (12).

6. The self-anchoring fixing device of the undersea cable in-line observation system according to claim 1, characterized in that, The angle between the first fixing rod and the second fixing rod is 120°.

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