Underwater anchor chain tensioner system

Abstract

The invention discloses an underwater anchor chain tensioner system which comprises a tensioner body, a guide groove is formed in the tensioner body, one side end of the tensioner body extends outwards to form a hinge part, the hinge part is used for being connected with a driven anchor chain capable of rotating, a first side inclined face is arranged in the guide groove, and a bottom inclined face is arranged at the bottom end of the tensioner body. In the process that the active anchor chain is lifted, the tensioner body and the active anchor chain can form a self-locking mode of joint movement and an unlocking mode of separate independent movement through the action of the first side inclined face and the bottom inclined face with the corresponding chain rings and the dragging effect of the passive anchor chain. The tensioner designed by the invention can be self-locked and unlocked with the driving anchor chain in the lifting process of the driving anchor chain, the driven anchor chain is driven to move upwards together during self-locking, the tensioning of the anchor is realized, and in an unlocking mode, the tensioner is lifted upwards along the driving anchor chain through an unlocking rope to be separated from the anchor chain, so that the tensioning of the anchor is realized. And the tensioner is directly taken back after being used, the whole structure is simple, and the cost is low.

Description

Technical Field

[0001] The present invention relates to the technical field of mooring system tensioning for floating structures, and particularly to an underwater anchor chain tensioner system. Background Art

[0002] Underwater anchoring technology, as a key link in the field of ocean engineering, plays an important role in aspects such as offshore wind power development, mooring of oil and gas platforms, and fixing of underwater facilities. This technology embeds the anchor body into the seabed and, in combination with an anchor chain tensioning system, provides a stable fixed foundation for various offshore structures (including floating platforms, mooring buoy systems, and subsea pipelines, etc.) to effectively resist the influence of complex marine environmental loads such as wind waves and ocean currents.

[0003] In the current construction process, the installation of a single drag anchor is mainly achieved by directly dragging the anchor chain with a winch. Since a huge frictional resistance between the anchor body and the seabed needs to be overcome during the installation of the drag anchor, the operating equipment must provide a great pulling force, which poses extremely high requirements for the power of the winch. Moreover, only one anchor can be dragged each time, resulting in low work efficiency and being disadvantageous to the development of ocean engineering projects.

[0004] Therefore, there is an urgent need for a new underwater anchor chain tensioner system to solve the above technical problems. Summary of the Invention

[0005] The present invention aims to solve the above technical problems, that is, to solve the problem that when installing a single drag anchor by the existing anchoring method, a huge frictional resistance between the anchor body and the seabed needs to be overcome, the operating equipment must provide a great pulling force, which poses extremely high requirements for the power of the winch, and only one anchor can be dragged each time, resulting in low work efficiency and being disadvantageous to the development of ocean engineering projects.

[0006] For this purpose, the present invention provides an underwater anchor chain tensioner system, including a tensioner. The tensioner includes a tensioner body. A guide groove for the active anchor chain to pass through is provided on the tensioner body. A hinge portion extends outward from one side end of the tensioner body, and the hinge portion is used to connect the passive anchor chain. The ends of both the active anchor chain and the passive anchor chain are used to connect the anchor. An inclined first side inclined surface is provided in the guide groove, and a bottom inclined surface is provided at the bottom end of the tensioner body. The tensioner body can form a self-locking mode of common movement and an unlocking mode of separate independent movement with the active anchor chain under the action of the first side inclined surface and the bottom inclined surface respectively with the corresponding chain links and the dragging action of the passive anchor chain during the process of lifting the active anchor chain, and the self-locking mode and the unlocking mode are automatically switched during the process of lifting the active anchor chain.

[0007] In the specific implementation of the above underwater anchor chain tensioner system, the underwater anchor chain tensioner system further includes an unlocking rope. The other end of the tensioner body extends outward to form an unlocking portion. The unlocking rope that can rotate relative to the tensioner body is connected to the unlocking portion. When the active anchor chain passes through the guide groove, the tensioner body can move along the active anchor chain under the lifting of the unlocking rope.

[0008] In the specific implementation of the above underwater anchor chain tensioner system, the guide groove is of a cross-shaped structure. The side wall surface of the guide groove opposite to the first side inclined surface is an inclined second side inclined surface. The groove body of the guide groove forms a reduced-diameter groove body structure that is narrow at the top and wide at the bottom under the distribution of the first side inclined surface and the second side inclined surface.

[0009] In the specific implementation of the above underwater anchor chain tensioner system, the bottom inclined surface is located on the side of the guide groove away from the hinge portion. The bottom end surface of the hinge portion is connected to the bottom end surface of the tensioner body outside the guide groove and is on the same inclined surface.

[0010] In the specific implementation of the above underwater anchor chain tensioner system, when the tensioner body and the active anchor chain are in the self-locking mode, the bottom inclined surface abuts against one of the chain links in the active anchor chain and the first side inclined surface fits against the other chain link.

[0011] In the specific implementation of the above underwater anchor chain tensioner system, the other end of the tensioner body extends outward to form a guiding portion. The guiding portion is located below the unlocking portion. The bottom end surface of the guiding portion is a guiding inclined surface. A transition sliding groove communicating with the guide groove is provided on the guiding inclined surface. The guiding inclined surface is connected to the bottom inclined surface through a transition surface.

[0012] In the specific implementation of the above underwater anchor chain tensioner system, the hinge portion is connected with a rotatable pin shackle. The pin shackle is connected to the passive anchor chain through a first connecting shackle. A second connecting shackle that can rotate relative to the tensioner body is connected to the unlocking portion. The unlocking rope is connected to the second connecting shackle.

[0013] In the specific implementation of the above underwater anchor chain tensioner system, the hinge portion includes two juxtaposed hinge blocks. The hinge blocks are fixedly connected to the tensioner body. The pin shackle is located between the two hinge blocks and is rotatably connected to them. The bottom end surface of the hinge block is connected to the bottom end surface of the tensioner body and is on the same inclined surface. Limiting blocks are respectively fixed to the bottom parts of the opposite side walls of the two hinge blocks to limit the rotation angle of the passive anchor chain during the lifting process of the active anchor chain.

[0014] In the specific embodiment of the above-mentioned underwater anchor chain tensioner system, the included angle between the guiding inclined plane and the horizontal plane is 10° - 30°, the included angle between the bottom end surface of the hinge part and the horizontal plane is 0° - 30°, and the included angle between the first side inclined plane and the horizontal plane is 75° - 80°.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The tensioner designed in the present invention can be self-locked and unlocked with the active anchor chain during the lifting process of the active anchor chain. The tensioner and the active anchor chain drive the passive anchor chain to be lifted upward together in the self-locking mode, realizing the tensioning of the corresponding anchor by the active anchor chain and the passive anchor chain. In the unlocking mode, the tensioner can be lifted upward along the active anchor chain by the unlocking rope for separation from the anchor chain. After the tensioner is used, it can be directly retrieved and reused in the tensioning operations of different anchors. The overall structure is simple and the cost is low. The tensioning operation only requires several times of lifting and lowering the tensioner, and the whole operation process is simple and fast, which can effectively save time costs.

[0016] 2. The tensioner can assist in the installation of two anchors simultaneously. Not only does it improve the work efficiency because two anchors are installed at one time, but also the action mode of the tensioner is similar to that of a movable pulley. The horizontal force required during the installation of the dragged anchor is converted into a vertical force through the tensioner. When the anchor chain forms a certain angle with the horizontal plane during the installation of the dragged anchor by pulling against each other, according to the static equilibrium analysis method, the required vertical pulling force is less than the horizontal force required for dragging the anchor chain during the dragging process. Therefore, the structure of the present invention reduces the dragging force of the anchor chain. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following describes the preferred embodiments of the present invention with reference to the drawings, in which: Figure 1 is the front view of the underwater anchor chain tensioner system provided by the present invention; Figure 2 is Figure 1 the top view of Figure 3a is Figure 1 the top view structural schematic diagram of the tensioner body in Figure 3b is the sectional structural schematic diagram of the tensioner body; Figure 3c is the three-dimensional structural schematic diagram of the tensioner body; Figure 4 is the schematic diagram of the rotation range of the passive anchor chain; Figure 5 is the schematic diagram of unlocking and recovering the tensioner body; Figure 6 is the schematic diagram of the force analysis of the tensioner body; Figure 7 is the schematic diagram of the force analysis of the tensioner body at a high position; Figure 8 Schematic diagram of the tensioner body sliding down along the active anchor chain; Figure 9 It is a schematic diagram of the tensioner body structural parameters.

[0018] List of reference numerals: 1. tensioner body; 101. guide groove; 102. first side slope; 103. bottom slope; 104. guide slope; 105. limit block; 106. pin hole; 107. unlocking hole; 108. hinge block; 109. guide part; 110. unlocking part; 2. active anchor chain; 3. passive anchor chain; 4. pin; 5. pin shackle; 6. first connecting shackle; 7. unlocking rope; 8. second connecting shackle. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are 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 work are within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the system or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are used to define components, only for the convenience of distinguishing the above components, and unless otherwise stated, the above terms have no special meanings and cannot be understood as indicating or implying relative importance.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "setting", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] The present invention relates to the technical field of mooring system tensioning for floating structures, and particularly to an underwater anchor chain tensioner system. The purpose is to solve the problem that when installing a single drag anchor by the existing fixed-anchor method, it is necessary to overcome the huge frictional resistance between the anchor body and the seabed, and the operating equipment must provide a great dragging force, which poses extremely high requirements for the power of the winch. Moreover, only one anchor can be dragged at a time, resulting in low work efficiency and being unfavorable to the development of marine engineering projects. For this purpose, the underwater anchor chain tensioner system provided by the present invention includes a tensioner. The tensioner includes a tensioner body. A guide groove for the active anchor chain to pass through is provided on the tensioner body. One side end of the tensioner body extends outward to form a hinge portion for connecting a rotatable passive anchor chain. The ends of both the active anchor chain and the passive anchor chain are used to connect the anchor. An inclined first side slope is provided in the guide groove, and a bottom slope is provided at the bottom end of the tensioner body. During the process of lifting the active anchor chain, the tensioner body can form a self-locking mode of co-movement with the active anchor chain and an unlocking mode of separate independent movement under the action of the first side slope and the bottom slope respectively on the corresponding chain links and the dragging action of the passive anchor chain, and the self-locking mode and the unlocking mode are automatically switched during the process of lifting the active anchor chain. The tensioner designed by the present invention can be self-locked and unlocked with the active anchor chain during the process of lifting the active anchor chain. In the self-locking mode, the tensioner and the active anchor chain drive the passive anchor chain to be lifted upward together, realizing the tensioning of the corresponding anchor by the active anchor chain and the passive anchor chain. In the unlocking mode, the tensioner can be lifted upward along the active anchor chain by an unlocking rope for separation from the anchor chain. After the tensioner is used, it can be directly retrieved and reused in the tensioning operations of different anchors. The overall structure is simple and the cost is low. The tensioning operation only requires several times of lifting and lowering the tensioner, and the whole operation process is simple and fast, which can effectively save time costs.

[0023] Next, the underwater anchor chain tensioner system provided by the embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0024] Refer to Figure 1-2 、 Figure 3a 、 3b, 3c, the present invention provides an underwater anchor chain tensioner system, including a tensioner. The tensioner includes a tensioner body 1. A guide groove 101 for the active anchor chain 2 to pass through is provided on the tensioner body 1. One side end of the tensioner body 1 extends outward to form a hinge portion, and the hinge portion is used to connect the passive anchor chain 3 and can enable the passive anchor chain 3 to rotate relative to the tensioner body 1. For 3, the ends of both the active anchor chain 2 and the passive anchor chain 3 are used to connect to the anchor, and the upper end of the active anchor chain 2 is used to connect to a winch or a crane. An inclined first side slope 102 is provided in the guide groove 101, and a bottom slope 103 is provided at the bottom end of the tensioner body 1. During the process of the active anchor chain 2 being lifted, the tensioner body 1 can form a self-locking mode of common movement and an unlocking mode of separate independent movement with the active anchor chain 2 under the action of the first side slope 102 and the bottom slope 103 respectively acting on the corresponding chain links and the dragging action of the passive anchor chain 3, and the self-locking mode and the unlocking mode are automatically switched during the lifting process of the active anchor chain 2.

[0025] In the above embodiment, preferably, the guide groove 101 is of a cross-shaped structure. The side wall surface of the guide groove 101 opposite to the first side slope 102 is an inclined second side slope. The groove body of the guide groove 101 forms a variable-diameter groove body structure that is narrow at the top and wide at the bottom under the distribution of the first side slope 102 and the second side slope. The active anchor chain 2 can pass through the guide groove 101 smoothly.

[0026] In the above embodiment, when the tensioner body 1 and the active anchor chain 2 are in the self-locking mode, the bottom slope 103 abuts against one of the chain links in the active anchor chain 2 and the first side slope fits with the other chain link. When the active anchor chain 2 and the tensioner body 1 are in the self-locking mode, one of the chain links in the active anchor chain 2 abuts against the bottom slope 103 and the other chain link fits with the first side slope 102, as Figure 6 shown.

[0027] In the above embodiment, preferably, referring to Figure 9 , the bottom slope 103 is located on the side of the guide groove 101 away from the hinge portion. The bottom end surface of the hinge portion is connected to the bottom end surface of the tensioner body 1 outside the guide groove 101 and is on the same inclined plane. The angle δ between the bottom end surface of the hinge portion and the horizontal plane is 0° - 30°. Exemplarily, this angle is 14°. The angle β between the first side slope 102 and the horizontal plane is 75° - 80°.

[0028] In one embodiment, referring to Figure 1 and Figure 3c , another side end of the tensioner body 1 extends outward to form a guiding portion 109. The guiding portion 109 is located below the unlocking portion 110. The bottom end surface of the guiding portion 109 is a guiding slope 104. A transition sliding groove communicating with the guide groove 101 is provided on the guiding slope 104. The guiding slope 104 and the bottom slope 103 are connected by a transition surface. As Figure 9As shown, if the width d of the bottom inclined plane is too small, the link below the bottom inclined plane is likely to slide into the guide groove and self-locking cannot be achieved. If it is too large, a large inclination angle is required to unlock. Therefore, the width d is designed to be 2 - 3.5D, where D is the chain diameter of the active anchor chain. Exemplarily, the chain diameter is 114 - 152 mm.

[0029] In the above embodiment, referring to Figure 9 , the included angle θ between the guiding inclined plane 104 and the horizontal plane is 10° - 30°. Exemplarily, this included angle is 26°. The total number of links accommodated inside the transition chute and the guide groove 101 is five or six, which can effectively prevent the active anchor chain 2 from jamming inside the guide groove 101.

[0030] In the above embodiment, preferably, referring to Figure 1 and Figure 3c , the articulated part is connected with a rotatable pin shackle 5, and the pin shackle 5 is connected to the passive anchor chain 3 through a first connecting shackle 6. Specifically, the articulated part includes two juxtaposed articulated blocks 108. The articulated blocks 108 are fixedly connected to the tensioner body 1. The pin shackle 5 is located between the two articulated blocks 108 and is rotatably connected thereto. The bottom end surface of the articulated block 108 is connected to the bottom end surface of the tensioner body 1 and is on the same inclined plane. At the bottom of the opposite side walls of the two articulated blocks 108, limit blocks 105 are respectively fixed to limit the rotation angle of the passive anchor chain 3 during the lifting process of the active anchor chain 2. The free swing range of the passive anchor chain 3 can be controlled within about 35 - 90°. As Figure 4 shown, during the tensioning process, the included angle between the active anchor chain 2 and the horizontal plane changes in real time. This swing range can meet the rotation requirements of the passive anchor chain 3, making the inclination angles of the passive anchor chain 3 and the active anchor chain 2 consistent, so that the two anchor chains are evenly stressed.

[0031] More specifically, the articulated block 108 is provided with a pin hole 106. A pin 4 is rotatably connected between the two articulated blocks 108 through the pin hole 106, and the pin shackle 5 is fixedly connected to the pin 4, so that the pin shackle 5 can rotate relative to the articulated part.

[0032] In one embodiment, referring to Figure 1 and Figure 4-5 , the underwater anchor chain tensioner system further includes an unlocking rope 7. The other end of the tensioner body 1 extends outward to form an unlocking part 110. The unlocking rope 7 that can rotate relative to the tensioner body 1 is connected to the unlocking part 110. When the active anchor chain passes through the guide groove, the tensioner body 1 can move along the active anchor chain 2 under the lifting of the unlocking rope 7.

[0033] Specifically, a second connecting shackle 8 that can rotate relative to the tensioner body 1 is connected to the unlocking part 110, and the unlocking rope 7 is connected to the second connecting shackle 8. More specifically, an unlocking hole 107 is provided on the unlocking part 110, the second connecting shackle 8 is connected to the unlocking hole 107, and the unlocking rope 7 can rotate relative to the tensioner body 1, as Figure 4-5 shown.

[0034] As Figure 8 shown, at this time, the included angle α marked in the figure is the unlocking critical angle of the tensioner body. Exemplarily, this angle is 20°, as Figure 5 shown, the included angle α marked in the figure is the angle at which the unlocking rope can tilt the tensioner body. This angle can be designed to be 50°, which is greater than Figure 8 the angle marked in

[0035] As Figure 5 shown, when the tensioning operation is completed and the tensioner body 1 needs to be retracted, the unlocking rope 7 can be lifted to tilt the tensioner body 1. When the tensioner body 1 tilts to a certain angle, the link on the active anchor chain 2 disengages from the first side inclined surface 102 and the bottom inclined surface 103 of the tensioner body 1. At this time, by lifting the unlocking rope, the tensioner body can slide upward along the active anchor chain out of the water surface, and then the tensioner is disassembled from the passive anchor chain and can be used for tensioning other anchor chains.

[0036] As Figure 6-7 shown, during self-locking, the corresponding link of the active anchor chain 2 will closely adhere to the bottom inclined surface 103 and the first side inclined surface 102 of the tensioner body 1. The tensioner body 1 will be jointly affected by the jacking force F2 of the bottom link, the pulling force F1 of the top link, the resistance F3 of the passive anchor chain 3, etc., and thus maintain a stable balance. Structurally speaking, counterclockwise rotation of the tensioner body 1 is beneficial for self-locking, and clockwise rotation to a certain angle can unlock it. Relative to the center of gravity, the pulling force F1 of the active anchor chain 2 generates a counterclockwise moment (assisting self-locking), while the resistance F3 of the passive anchor chain 3 will cause a clockwise moment (assisting unlocking). However, the jacking force F2 of the bottom link will generate moments with different effects as the anchor chain angle γ changes. When the anchor chain angle γ is small, the jacking force F2 generates a counterclockwise moment to assist the tensioner body 1 in self-locking. As the anchor chain angle γ increases, the moment generated by the jacking force F2 will change direction, causing the tensioner body 1 to gradually unlock from the active anchor chain 2. Or rather, when the tensioner body 1 is lifted to a certain height, as the anchor chain angle γ increases, the link pressing against the bottom inclined surface 103 has a tendency to separate from the tensioner body 1. At this time, as Figure 8As shown in the figure, under the drag of the passive anchor chain 3, the tensioner body 1 will rotate, thus unlocking it from the active anchor chain 2. Due to its own weight, the tensioner body 1 will slide downward along the active anchor chain 2 for a certain distance. The active anchor chain 2 and the passive anchor chain 3 present a catenary state in water. The closer the anchor chain is to the seabed, the smaller the anchor chain angle γ. After sliding for a certain distance, as the anchor chain angle γ decreases, the tensioner body 1 will stop on the active anchor chain 2. At this time, the distance from the tensioner body 1 to the anchor will be shortened.

[0037] The tensioner designed in the present invention can assist in the installation of two anchors by dragging at the same time. Not only does the one-time installation of two anchors improve work efficiency, but also the action mode of the tensioner is similar to that of a movable pulley. The horizontal force required for dragging the anchor for installation is converted into a vertical force through the tensioner. When the anchors are installed by pulling against each other, the anchor chain forms a certain angle with the horizontal plane. According to the static equilibrium analysis method, the required vertical pulling force is less than the horizontal force required for dragging the anchor chain during the dragging process. Therefore, the structure of the present invention reduces the anchor chain dragging force.

[0038] The technological process of the underwater anchor chain tensioner system provided by the present invention can be divided into four steps: The first step: Assembly Assemble each component of the underwater tensioner. Pass the active anchor chain 2 through the tensioner body 1; connect the passive anchor chain 3 to the pin 4 through the first connecting shackle 6; assemble the unlocking rope 7 to the unlocking hole 107 of the tensioner body 1 through the second connecting shackle 8.

[0039] The second step: Lowering Lower the underwater tensioner to the seabed. Fix the active anchor chain 2 to the winch / crane hook; loosen the unlocking rope 7 and lower the tensioner body 1 to the seabed. Note that the tensioner body 1 passes through the active anchor chain 2 and slides down along the active anchor chain 2 to the seabed.

[0040] The third step: Tensioning The tensioning operation is achieved by pulling the active anchor chain 2. When the winch hoists the active anchor chain 2, the tensioner body 1 and the active anchor chain 2 are structurally self-locked, driving the passive anchor chain 3 to be lifted upward together. In this way, the active anchor chain 2 and the passive anchor chain 3 are stretched and tensioned, and at the same time, the anchors fixed at the ends of the active anchor chain 2 and the passive anchor chain 3 are loaded and embedded into the seabed. When the active anchor chain 2 is hoisted to a certain height, as the anchor chain angle γ increases, the tensioner body 1 will actively slide downward along the active anchor chain 2 for a certain distance. In this way, the distance between the tensioner body 1 and the anchor will be shortened, that is, the tensioned length of the anchor chain will be reduced. When the active anchor chain 2 is hoisted again, after the tensioner body 1 is lifted and then slides down for a certain distance, the active anchor chain 2 and the passive anchor chain 3 are further tensioned. This process is called the yo-yo motion (the tensioner body 1 rises and slides down). By repeating the yo-yo motion, the tension force will gradually increase. In this application, the required pre-tightening load can be obtained after repeating the yo-yo motion about five to seven times. It should be noted that the number of repetitions is not specifically limited in this application and can be selected according to actual requirements.

[0041] Note that the unlocking rope 7 needs to be relaxed throughout the tensioning process.

[0042] Step 4: Recovery Recover the underwater tensioner. After the tensioning is completed, maintain the tension force for a period of time (15 - 30 min), and then lower the tensioner body 1 to the seabed. Slack the active anchor chain 2, use the unlocking rope 7 to take the tensioner out above the sea surface, and then disassemble it from the active anchor chain and the passive anchor chain, and it can be reused on other anchor chains.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. An underwater anchor chain tensioner system, characterized in that, It includes a tensioner, and the tensioner includes a tensioner body. A guide groove for the active anchor chain to pass through is provided on the tensioner body. An articulated part extends outward from one side end of the tensioner body, and the articulated part is used to connect the passive anchor chain. An inclined first side inclined surface is provided in the guide groove, and a bottom inclined surface is provided at the bottom end of the tensioner body. During the process of the active anchor chain being lifted, the tensioner body can form a self-locking mode of common movement and an unlocking mode of separate independent movement with the active anchor chain through the action of the first side inclined surface and the bottom inclined surface with the corresponding chain links respectively and under the dragging action of the passive anchor chain, and the self-locking mode and the unlocking mode are automatically switched during the lifting process of the active anchor chain.

2. The underwater anchor chain tensioner system according to claim 1, wherein The underwater anchor chain tensioner system further includes an unlocking rope. An unlocking part extends outward from the other side end of the tensioner body, and the unlocking rope that can rotate relative to the tensioner body is connected to the unlocking part. When the active anchor chain passes through the guide groove, the tensioner body can move along the active anchor chain under the lifting of the unlocking rope.

3. The underwater anchor chain tensioner system according to claim 1, characterized in that, The guide groove is of a cross-shaped structure. The side wall surface opposite to the first side inclined surface in the guide groove is an inclined second side inclined surface, and the groove body of the guide groove forms a variable-diameter groove body structure that is narrow at the top and wide at the bottom under the distribution of the first side inclined surface and the second side inclined surface.

4. The underwater anchor chain tensioner system according to claim 1, wherein The bottom inclined surface is located on the side of the guide groove away from the articulated part. The bottom end surface of the articulated part is connected to the bottom end surface of the tensioner body outside the guide groove and is on the same inclined surface.

5. The underwater anchor chain tensioner system according to claim 1, characterized in that, When the tensioner body and the active anchor chain are in the self-locking mode, the bottom inclined surface abuts against one of the chain links in the active anchor chain and the first side inclined surface fits against the other chain link.

6. The underwater anchor chain tensioner system according to claim 2, wherein A guiding part extends outward from the other side end of the tensioner body. The guiding part is located below the unlocking part. The bottom end surface of the guiding part is a guiding inclined surface. A transition sliding groove communicating with the guide groove is provided on the guiding inclined surface, and the guiding inclined surface is connected to the bottom inclined surface through a transition surface.

7. The underwater anchor chain tensioner system according to claim 2, characterized in that, The articulated part is connected with a rotatable pin shackle. The pin shackle is connected to the passive anchor chain through a first connecting shackle. A second connecting shackle that can rotate relative to the tensioner body is connected to the unlocking part, and the unlocking rope is connected to the second connecting shackle.

8. The underwater anchor chain tensioner system according to claim 7, characterized in that, The articulated part includes two juxtaposed articulated blocks. The articulated blocks are fixedly connected to the tensioner body. The pin shackle is located between the two articulated blocks and is rotatably connected to them. The bottom end surface of the articulated block is connected to the bottom end surface of the tensioner body and is on the same inclined surface. Limiting blocks are respectively fixed to the bottom parts of the opposite side walls of the two articulated blocks to limit the rotation angle of the passive anchor chain during the lifting process of the active anchor chain.

9. The underwater anchor chain tensioner system according to claim 6, characterized in that, The included angle between the guiding inclined surface and the horizontal plane is 10° - 30°, the included angle between the bottom end surface of the articulated part and the horizontal plane is 0° - 30°, and the included angle between the first side inclined surface and the horizontal plane is 75° - 80°.

Images