Bending degree measuring device for submarine cable laying

Abstract

The invention relates to the technical field of submarine cable bending measurement, and discloses a submarine cable laying curvature measuring device, which comprises a head end annular block and a submarine cable sleeve, and further comprises a connecting mechanism, and the connecting mechanism comprises a plurality of circular connecting blocks and a tail end connecting block which are sequentially arranged behind the head end annular block. Bending strain of the submarine cable is monitored in real time through the fiber grating sensor, wavelength offset is converted into curvature data, seawater in the hollow rubber blocks can generate pressure when the adjacent hollow rubber blocks are in contact due to the fact that the water outlet apertures of the circular water spraying holes are small, and therefore buffering force generated when the adjacent hollow rubber blocks are in contact is increased, and the submarine cable is prevented from being damaged. And the damage caused by rapid bending of the device is further reduced, water sprayed out of the circular water spraying holes correspondingly impacts the outer wall of the submarine cable sleeve, algae and shellfish organisms entering the device from gaps between the circular connecting blocks are removed, and therefore the algae and shellfish organisms are prevented from influencing the submarine cable.

Description

Technical Field

[0001] The present invention relates to the technical field of submarine cable bending measurement equipment, in particular to a bending measurement device for submarine cable laying. Background Art

[0002] Real-time measurement of submarine cable curvature requires the use of fiber grating sensors. In complex submarine environments, cables often bend and deform due to ocean currents, geological movements, ship anchor strikes, and installation / maintenance operations. Excessive bending can cause microbends or macrobends within the fiber, and in severe cases, can even cause fiber breakage, leading to communication interruptions. Therefore, real-time monitoring of the cable's bending state and strain distribution is crucial for preventing damage and ensuring stable system operation.

[0003] When the submarine cable bends rapidly or with a large curvature, the sensor is prone to permanent deformation or breakage, resulting in failure of the monitoring function and the formation of a "monitoring blind spot"; the problem of marine biological attachment has a long-term impact on the performance of the submarine cable. Seaweed, barnacles, shellfish and other organisms are prone to breed and accumulate on the outer wall of the submarine cable and in the gaps of the connecting structure, forming a biofouling layer. The accumulation of organisms will change the local stiffness of the submarine cable and interfere with the accurate transmission of strain from the outer sheath to the internal sensor, resulting in distortion of curvature measurement, reduced monitoring accuracy, and even misjudgment. Summary of the Invention

[0004] The object of the present invention is to provide a device for measuring the curvature of submarine cables for laying, so as to solve the problems raised in the above-mentioned background technology.

[0005] To solve the above technical problems, the present invention is achieved through the following technical solutions: The present invention is a device for measuring the curvature of a submarine cable for laying, comprising a head-end annular block and a submarine cable sleeve, and further comprising: An optical fiber measurement unit, comprising an optical fiber Bragg grating (FBG) sensor disposed within the cable sheath. The optical fiber Bragg grating (FBG) sensor is connected to the deck monitoring system via an armored optical cable and converts wavelength deviation signals into curvature data, triggering an alarm. The optical fiber Bragg grating (FBG) sensor detects cable curvature by real-time monitoring of optical fiber wavelength deviation. A connecting mechanism, wherein the connecting mechanism includes a plurality of circular connecting blocks and an end connecting block sequentially arranged behind the head end annular block, and the submarine cable sleeve passes through the head end annular block, the plurality of circular connecting blocks and the end connecting block; A buffer mechanism is provided on several circular connecting blocks and an end connecting block, and the buffer mechanism includes two connecting plates fixedly mounted on the outer walls of the several circular connecting blocks and the end connecting block, two limiting round rods are fixedly mounted on several of the circular connecting blocks and the head end annular block respectively, and several of the limiting round rods rotate and pass through several connecting plates respectively, and annular threaded plates are respectively provided on the sides of the end connecting block and the head end annular block away from the circular connecting block, and the buffer mechanism is used to limit the lateral swing amplitude of the circular connecting block.

[0006] Furthermore, the connecting mechanism also includes two hollow rubber blocks fixedly mounted on the back of the head end annular block, the front and back of several circular connecting blocks, and the front of the end connecting block, wherein the side close to the head end annular block is the front side, and the side close to the end connecting block is the back side.

[0007] Furthermore, annular cavities are respectively provided on the head end annular block, the plurality of circular connecting blocks and the end connecting block, and circular water spray holes are respectively provided on the inner walls of the head end annular block, the plurality of circular connecting blocks and the end connecting block. The plurality of circular water spray holes are respectively communicated with the plurality of annular cavities, and the circular water spray holes spray water to drive away attached organisms, thereby avoiding distortion of sensor strain transmission caused by biological accumulation.

[0008] Furthermore, a plurality of cables are arranged in the submarine cable sheath.

[0009] Furthermore, the two annular threaded plates are respectively threadedly sleeved with a pentaangular head bolt.

[0010] Furthermore, a plurality of elastic limiting thread plates are fixedly installed on one end of the two annular thread plates away from each other, and thread grooves are provided on the plurality of elastic limiting thread plates. A plurality of elastic limiting thread plates are fixedly installed on one end of the circular connecting block away from each other with limiting ends.

[0011] Furthermore, trapezoidal rubber blocks are fixedly mounted on the inner sides of the plurality of elastic limiting threaded plates, and the materials of the plurality of trapezoidal rubber blocks and the submarine cable sleeve are both made of rubber.

[0012] Furthermore, two limiting grooves are respectively provided on the sides of the plurality of trapezoidal rubber blocks close to each other, and a plurality of annular limiting blocks are provided on the outer wall of the submarine cable sleeve, and the plurality of limiting grooves are adapted to the annular limiting blocks.

[0013] The present invention has the following beneficial effects: (1) The present invention provides a bending measurement device for laying submarine cables. During the bending process of the submarine cable, the fiber optic Bragg grating sensor is used to monitor the bending strain of the submarine cable in real time, and the wavelength offset is converted into curvature data. Since the circular water spray hole and the annular cavity are connected, when the circular connecting block is placed on the seabed, seawater will enter the annular cavity from the circular water spray hole, and the seawater will enter the hollow rubber block from the annular cavity. When the hollow rubber blocks are in contact due to bending, the adjacent hollow rubber blocks are squeezed to cause seawater to be ejected from the circular water spray hole into the sea. Since the water outlet diameter of the circular water spray hole is small, the seawater in the hollow rubber block is Water will generate pressure when adjacent hollow rubber blocks come into contact, thereby increasing the buffering force when adjacent hollow rubber blocks come into contact, further reducing damage to the device caused by rapid bending, and correspondingly reducing damage to the fiber Bragg grating sensor due to excessive bending, which affects the real-time measurement function of the fiber Bragg grating sensor. Correspondingly, the water sprayed from the circular water hole will impact the outer wall of the submarine cable sheath, expelling algae and shellfish that enter the device through the gaps between the circular connecting blocks, avoiding biological accumulation and causing distortion of sensor strain transmission, and ensuring bending measurement accuracy (±0.1°); (2) The present invention provides a bending measurement device for laying submarine cables. When in use, the head end annular block, several circular connecting blocks and the end connecting block are put on the submarine cable sleeve, and then the two pentagonal head bolts are rotated respectively to move the two pentagonal head bolts away from each other. The pentagonal head bolts will rotate and move under the action of the threads of the annular thread plate. The pentagonal head bolts will move to several elastic limiting thread plates under the action of the thread groove. During the movement of the pentagonal head bolts, the several elastic limiting thread plates will be driven to shrink and approach the submarine cable sleeve. The elastic limiting thread plates will drive several trapezoidal rubber blocks to move relative to each other. When the pentagonal head bolts are brought close to each other and contact the submarine cable sleeve, the trapezoidal rubber blocks will clamp the submarine cable sleeve as the pentagonal head bolts continue to rotate. The corresponding limiting grooves on the trapezoidal rubber blocks will be stuck on the annular limiting blocks on the submarine cable sleeve, thereby fixing the head end annular block, several circular connecting blocks and the end connecting block on the submarine cable. Since the limiting grooves are stuck on the annular limiting blocks, when the submarine cable drifts with the waves, the device will not slip or move under the limiting action of the annular limiting blocks and limiting grooves, thereby ensuring the stability of the device. This structure can also realize the rapid installation and fixation of the submarine cable, thereby improving the installation efficiency. (3) The present invention provides a bending measurement device for laying submarine cables. After the device is installed, the submarine cable is placed on the seabed. When encountering a typhoon or large waves, the waves will push the submarine cable and the device together, and the device and the submarine cable will drift on the seabed. At this time, the submarine cable will swing irregularly under the action of the waves and bend. The corresponding fiber optic Bragg grating sensor will bend along with the submarine cable. The fiber optic Bragg grating sensor is used to measure the bending of the submarine cable in real time. The bending of the submarine cable will drive the bending of several circular connecting blocks. Due to the limiting action of the limiting rod and the connecting plate, the circular connecting blocks will only swing left and right. This reduces the risk of free swinging of the device. When the circular connecting block bends, it will contact the adjacent circular connecting block, thereby limiting the bending of the submarine cable and making the bending value of the submarine cable greater than 1.5 meters, avoiding the cable inside the submarine cable due to excessive bending. Through the coordinated effect of optical fiber sensing and mechanical buffering, it can ensure the bending measurement accuracy (±0.1°) and avoid the submarine cable from being broken due to instantaneous impact overload. When the circular connecting blocks are close to each other due to bending, the adjacent hollow rubber blocks will first be in contact, thereby playing a buffering role and avoiding long-term direct contact of the circular connecting blocks to cause wear.

[0014] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a side cross-sectional structural schematic diagram of the present invention; Figure 3 It is a partial cross-sectional structural schematic diagram of the present invention; Figure 4 For the present invention Figure 3 Schematic diagram of the enlarged structure of A; Figure 5 It is a partial front cross-sectional structural schematic diagram of the present invention; Figure 6 For the present invention Figure 5 Schematic diagram of the enlarged structure of B; Figure 7 For the present invention Figure 3 Schematic diagram of the enlarged structure of C in the middle; Figure 8 For the present invention Figure 1 Schematic diagram of the enlarged structure of D in the middle.

[0017] In the accompanying drawings, the components represented by the reference numerals are as follows: In the figure: 1. Head end annular block; 101. End connecting block; 102. Circular connecting block; 103. Hollow rubber block; 104. Annular cavity; 105. Circular water spray hole; 106. Cable sleeve; 107. Cable; 108. Fiber Bragg grating sensor; 2. Connecting plate; 201. Limiting round rod; 202. Annular threaded plate; 203. Pentagonal head bolt; 204. Elastic limiting threaded plate; 205. Limiting end; 206. Trapezoidal rubber block; 207. Limiting groove; 208. Annular limiting block. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] See also Figures 1-8 As shown, the present invention is a device for measuring the curvature of a submarine cable for laying, comprising a head-end annular block 1 and a submarine cable sleeve 106, and further comprising: The fiber optic measurement unit includes a fiber optic Bragg grating sensor 108 disposed in a submarine cable sheath 106. The fiber optic Bragg grating sensor 108 is connected to the deck monitoring system via an armored optical cable. The fiber optic Bragg grating sensor 108 converts the wavelength deviation signal into curvature data and triggers an alarm. The fiber optic Bragg grating sensor 108 detects the curvature of the submarine cable by real-time monitoring of the optical fiber wavelength deviation. The connecting mechanism includes a plurality of circular connecting blocks 102 and an end connecting block 101 sequentially arranged behind the head end annular block 1, and the submarine cable sleeve 106 passes through the head end annular block 1, the plurality of circular connecting blocks 102 and the end connecting block 101; The buffer mechanism is arranged on several circular connecting blocks 102 and the end connecting block 101. The buffer mechanism includes two connecting plates 2 fixedly installed on the outer walls of the several circular connecting blocks 102 and the end connecting block 101. Two limiting circular rods 201 are fixedly installed on the several circular connecting blocks 102 and the head end ring block 1 respectively. The several limiting circular rods 201 rotate through the several connecting plates 2 respectively. The end connecting block 101 and the head end ring block 1 are respectively provided with an annular threaded plate 202 on the side away from the circular connecting block 102. The buffer mechanism is used to limit the lateral swing amplitude of the circular connecting block 102.

[0020] like Figure 1 、 Figure 2 and Figure 3As shown, the connecting mechanism also includes two hollow rubber blocks 103 respectively fixedly mounted on the back of the head end annular block 1, the front and back of several circular connecting blocks 102, and the front of the end connecting block 101, wherein the side close to the head end annular block 1 is the front side, and the side close to the end connecting block 101 is the back side.

[0021] During use, the head end annular block 1, several circular connecting blocks 102 and the end connecting block 101 are put on the submarine cable sleeve 106, and then the two pentagonal head bolts 203 are rotated respectively.

[0022] like Figure 4 As shown, an annular cavity 104 is respectively opened on the head end annular block 1, several circular connecting blocks 102 and the end connecting block 101, and circular water spray holes 105 are respectively opened on the inner walls of the head end annular block 1, several circular connecting blocks 102 and the end connecting block 101. The several circular water spray holes 105 are respectively communicated with the several annular cavities 104. The circular water spray holes 105 spray water to drive away attached organisms to avoid distortion of sensor strain transmission caused by biological accumulation.

[0023] During the bending process of the submarine cable, the fiber grating sensor 108 monitors the bending strain of the submarine cable in real time and converts the wavelength offset into curvature data. Since the circular water hole 105 and the annular cavity 104 are connected, when the circular connecting block 102 is placed on the seabed, seawater will enter the annular cavity 104 from the circular water hole 105. The annular cavity 104 is connected to the hollow rubber block 103, and seawater will enter the hollow rubber block 103 from the annular cavity 104. When the hollow rubber blocks 103 come into contact due to bending, the adjacent hollow rubber blocks 103 are squeezed, causing seawater to be ejected from the circular water hole 105 into the sea.

[0024] like Figure 8 As shown, a plurality of cables 107 are arranged in the submarine cable sleeve 106 .

[0025] Correspondingly, the water sprayed from the circular water spray holes 105 will impact the outer wall of the submarine cable sleeve 106, and expel the algae and shellfish that enter the device from the gaps between the circular connecting blocks 102, thereby preventing the algae and shellfish from affecting the submarine cable.

[0026] like Figure 8 As shown, two annular threaded plates 202 are respectively threadedly sleeved with pentaangular head bolts 203 .

[0027] Subsequently, a special tool is used to rotate the two pentagonal head bolts 203 provided at the head and tail ends respectively, so that they rotate in opposite directions, that is, away from each other. During the rotation process, the pentagonal head bolts 203 are threadedly engaged with the annular threaded plate 202 fixed to the tail connection block 101 and the head end annular block 1, thereby moving axially outward under the action of the thread transmission. As the pentagonal head bolts 203 are axially advanced, the pentagonal head bolts 203 are threadedly engaged with the annular threaded plate 202 fixed to the tail connection block 101 and the head end annular block 1.

[0028] like Figure 6 As shown, a plurality of elastic limiting thread plates 204 are fixedly installed at one end of the two annular thread plates 202 away from each other, and thread grooves are provided on the plurality of elastic limiting thread plates 204. A plurality of elastic limiting thread plates 204 are fixedly installed at one end away from the circular connecting block 102 with a limiting end 205.

[0029] Its front end gradually enters and acts on the thread grooves of several elastic limiting thread plates 204 that are evenly distributed circumferentially. Since the root of the elastic limiting thread plate 204 has elastic deformation ability and its circumferential position is limited, it cannot rotate with the bolt. Therefore, under the thrust of the five-point head bolt 203, each elastic limiting thread plate 204 produces radial inward elastic contraction.

[0030] like Figure 4 As shown, trapezoidal rubber blocks 206 are fixedly mounted on the inner sides of the plurality of elastic limiting threaded plates 204 , and the materials of the plurality of trapezoidal rubber blocks 206 and the submarine cable sleeve 106 are both made of rubber.

[0031] The whole structure shows a centripetal contraction trend. This radial contraction movement drives the several trapezoidal rubber blocks 206 connected to its ends to synchronously approach the central axis of the submarine cable sleeve 106. When the trapezoidal rubber blocks 206 come into contact with the outer wall of the submarine cable sleeve 106, as the pentagonal head bolts 203 continue to rotate, the clamping force gradually increases, so that the trapezoidal rubber blocks 206 are tightly fitted to the surface of the submarine cable sleeve 106, achieving a firm radial clamping.

[0032] like Figure 4 As shown, two limiting grooves 207 are respectively provided on the side close to each other of the plurality of trapezoidal rubber blocks 206 , and a plurality of annular limiting blocks 208 are provided on the outer wall of the submarine cable sleeve 106 , and the plurality of limiting grooves 207 are all adapted to the annular limiting blocks 208 .

[0033] During this process, the limiting groove 207 arranged on the inner side of the trapezoidal rubber block 206 is gradually aligned with and finally snapped into the annular limiting block 208 with a preset protruding structure on the outer wall of the submarine cable sleeve 106, forming a mechanical limiting fit. Through the above operation, the head end annular block 1, several circular connecting blocks 102 and the end connecting block 101 are fixed as a whole on the submarine cable sleeve 106. When the submarine cable vibrates or axially displaces due to environmental loads such as waves and ocean currents, the mechanical locking structure between the limiting groove 207 and the annular limiting block 208 can effectively limit the axial sliding of the device along the cable, prevent it from falling off or displacement, and ensure the long-term stability and safety of the device under complex marine working conditions.

[0034] During use, the head-end annular block 1, several circular connecting blocks 102, and the end connecting block 101 are first sequentially placed on the outer circumference of the submarine cable sleeve 106. The annular components are spliced ​​axially to form a detachable annular integral structure, which is convenient for on-site installation during submarine cable laying or maintenance. Subsequently, the two pentagonal head bolts 203 set at the head and end are rotated in opposite directions, that is, away from each other, using a special tool. During the rotation process, the pentagonal head bolts 203 engage with the annular threaded plates 202 fixed to the end connecting block 101 and the head-end annular block 1, thereby moving axially outward under the action of the thread transmission. As the pentagonal head bolt 203 is pushed forward axially, its front end gradually enters and acts on the thread grooves of several elastic limiting thread plates 204 that are evenly distributed in the circumferential direction. Since the root of the elastic limiting thread plates 204 has elastic deformation ability and its circumferential position is limited, it cannot rotate with the bolt. Therefore, under the thrust of the pentagonal head bolt 203, each elastic limiting thread plate 204 produces radial inward elastic contraction, and the whole tends to shrink centripetally. This radial contraction movement drives several trapezoidal rubber blocks 206 connected to its end to synchronously approach the central axis of the submarine cable sleeve 106. When the trapezoidal rubber block 206 contacts the outer wall of the submarine cable sleeve 106, as the pentagonal head bolt 203 continues to rotate, the clamping force gradually increases, so that the trapezoidal rubber block 206 It fits tightly to the surface of the submarine cable sleeve 106 to achieve a firm radial hold. During this process, the limiting groove 207 provided on the inner side of the trapezoidal rubber block 206 gradually aligns with and finally snaps into the annular limiting block 208 with a preset raised structure on the outer wall of the submarine cable sleeve 106, forming a mechanical limiting fit. Through the above operation, the head end annular block 1, several circular connecting blocks 102 and the end connecting block 101 are fixed to the submarine cable sleeve 106 as a whole. When the submarine cable vibrates or axially displaces due to environmental loads such as waves and ocean currents, the mechanical engagement structure between the limiting groove 207 and the annular limiting block 208 can effectively limit the axial sliding of the device along the cable, preventing it from falling off or displacement, thereby ensuring the long-term stability and safety of the device under complex marine working conditions. After the device is installed, the submarine cable is laid on the seabed. When encountering harsh marine environments such as typhoons or strong waves, the impact of the waves will push the submarine cable and the device installed on it to displace and drift on the seabed; at this time, the submarine cable will swing irregularly under the action of the water flow and undergo varying degrees of bending and deformation. As the submarine cable bends, the fiber optic Bragg grating sensor 108 fixed on it will deform synchronously, and can monitor the bending state of the submarine cable in real time and accurately. Through fiber optic sensing technology, the system can continuously obtain the bending angle and curvature changes of the submarine cable, achieving high-precision measurement of the curvature with a measurement accuracy of up to ±0.1°, providing data support for the safe operation of the submarine cable. The bending deformation of the submarine cable will be transmitted to several circular connecting blocks 102 fixed on its outside, causing it to undergo relative bending movement. Under the coordinated limiting action of the limiting round rod 201 and the connecting plate 2, the relative movement between the circular connecting blocks 102 is constrained within a controllable left and right swing range, avoiding the risks of structural loosening, collision or stress concentration caused by free swinging of the device, and improving the stability of the overall structure. When the bending degree of the submarine cable increases, adjacent circular connecting blocks 102 will come into contact due to axial proximity. During the contact process, the hollow rubber block 103 set on the end face of the circular connecting block 102 first realizes buffer contact. The hollow rubber block 103 is made of a rubber material with good elasticity and resistance to seawater corrosion, and has excellent energy absorption and buffering properties, which can effectively alleviate the rigid collision between adjacent connecting blocks and extend the service life of the device. During the bending and deformation of the submarine cable, the fiber grating sensor 108 monitors the bending strain state of the submarine cable in real time. When the submarine cable bends, the deformation causes the internal grating period of the sensor to change, causing the wavelength of the reflected light to shift. The system detects the wavelength shift and, in combination with the calibration algorithm, accurately converts it into corresponding curvature data to achieve continuous, high-precision dynamic monitoring of the bending state of the submarine cable. At the same time, since the circular water hole 105 is interconnected with the annular cavity 104, when the circular connecting block 102 is placed on the seabed, Under the action of water pressure, seawater naturally flows into the annular cavity 104 through the circular water spray hole 105. Since the annular cavity 104 is connected to the hollow rubber block 103 inside, seawater further fills the hollow cavity of the hollow rubber block 103, making its interior in a state of pressure balance with the external seawater. When the submarine cable is rapidly bent due to the action of waves or ocean currents, the adjacent circular connecting blocks 102 will drive the hollow rubber blocks 103 at their ends to squeeze and contact during the process of relative proximity. At this time, the seawater inside the hollow rubber block 103 is compressed. This generates a transient pressure increase. Due to the small diameter of the circular water outlet holes 105, a certain amount of fluid resistance is created, further increasing the internal pressure. This significantly enhances the buffering force between the hollow rubber blocks 103. This "hydraulic buffering" effect effectively absorbs the structural collision energy, mitigates the impact intensity, and further reduces the risk of mechanical damage to the device due to severe bending or instantaneous overload. More importantly, this buffering mechanism can effectively alleviate the local stress concentration on the fiber Bragg grating sensor 108, preventing it from breaking or performance degradation due to excessive bending or impact, thereby ensuring its long-term stable operation and the reliability of its real-time measurement function. In addition, the seawater ejected from the circular water outlet holes 105 forms a directional jet under the action of pressure, scouring the gap between the outer wall of the submarine cable sheath 106 and the circular connecting block 102. This water flow effectively dispels or washes away marine organisms such as algae and shellfish that have invaded the gap, preventing their accumulation within the device and causing corrosion, blockage, or affecting the structural performance. This further enhances the durability and maintainability of the device in complex marine environments.

[0035] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A bending measurement device for laying a submarine cable, comprising a head end annular block (1) and a submarine cable sleeve (106), characterized in that: Also includes: An optical fiber measurement unit, the optical fiber measurement unit comprising an optical fiber grating sensor (108) disposed in a submarine cable sheath (106), the optical fiber grating sensor (108) being connected to a deck monitoring system via an armored optical cable, converting a wavelength offset signal into curvature data and triggering an alarm, the optical fiber grating sensor (108) detecting the curvature of the submarine cable by real-time monitoring of the optical fiber wavelength offset; A connecting mechanism, the connecting mechanism comprising a plurality of circular connecting blocks (102) and an end connecting block (101) sequentially arranged behind the head end circular block (1), the submarine cable sleeve (106) passing through the head end circular block (1), the plurality of circular connecting blocks (102) and the end connecting block (101); A buffer mechanism is provided on a plurality of circular connecting blocks (102) and an end connecting block (101), the buffer mechanism comprising two connecting plates (2) fixedly mounted on the outer walls of the plurality of circular connecting blocks (102) and the end connecting block (101), two limiting round rods (201) fixedly mounted on the plurality of circular connecting blocks (102) and the head end annular block (1), the plurality of limiting round rods (201) respectively rotatingly passing through the plurality of connecting plates (2), the side of the end connecting block (101) and the head end annular block (1) away from the circular connecting block (102) are respectively provided with an annular threaded plate (202), and the buffer mechanism is used to limit the lateral swing amplitude of the circular connecting block (102).

2. A device for measuring the curvature of a submarine cable according to claim 1, characterized in that: The connecting mechanism further comprises two hollow rubber blocks (103) respectively fixedly mounted on the back of the head end annular block (1), the front and back of the plurality of circular connecting blocks (102), and the front of the end connecting block (101), wherein the side close to the head end annular block (1) is the front side, and the side close to the end connecting block (101) is the back side.

3. The device for measuring the curvature of a submarine cable according to claim 1, wherein: Annular cavities (104) are respectively provided on the head end annular block (1), the plurality of circular connecting blocks (102) and the terminal connecting block (101). Circular water spray holes (105) are respectively provided on the inner walls of the head end annular block (1), the plurality of circular connecting blocks (102) and the terminal connecting block (101). The plurality of circular water spray holes (105) are respectively communicated with the plurality of annular cavities (104). The circular water spray holes (105) spray water to drive away attached organisms, thereby preventing strain transmission distortion of the sensor caused by accumulation of organisms.

4. The device for measuring the curvature of a submarine cable according to claim 1, wherein: A plurality of cables (107) are arranged in the submarine cable sleeve (106).

5. The device for measuring the curvature of a submarine cable according to claim 1, wherein: Pentagonal head bolts (203) are respectively threadedly sleeved on the two annular threaded plates (202).

6. The device for measuring the curvature of a submarine cable according to claim 1, characterized in that: A plurality of elastic limiting thread plates (204) are fixedly mounted on ends of the two annular thread plates (202) that are away from each other, and thread grooves are provided on the plurality of elastic limiting thread plates (204). A plurality of elastic limiting thread plates (204) are fixedly mounted on ends of the two annular thread plates (202) that are away from each other and the circular connecting block (102) with limiting ends (205).

7. A device for measuring the curvature of a submarine cable according to claim 6, characterized in that: Trapezoidal rubber blocks (206) are fixedly mounted on the inner sides of the plurality of elastic limiting threaded plates (204), and the materials of the plurality of trapezoidal rubber blocks (206) and the submarine cable sleeve (106) are all made of rubber.

8. The device for measuring the curvature of a submarine cable according to claim 7, characterized in that: Two limiting grooves (207) are respectively provided on the sides of the plurality of trapezoidal rubber blocks (206) close to each other, and a plurality of annular limiting blocks (208) are provided on the outer wall of the submarine cable sleeve (106), and the plurality of limiting grooves (207) are all adapted to the annular limiting blocks (208).

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