Adaptive deployment remote trigger shear and deployment shear method thereof

Abstract

The present invention relates to an adaptive deployment remote trigger shear and a deployment shearing method thereof, which is used underwater in conjunction with a towing ROV. The shear comprises a shearing device, a deployment device connecting the shearing device and the towing ROV, the shearing device being connected to an underwater acoustic controller, the deployment device comprising a base assembly, a hydraulic cylinder, and a push rod, wherein a diameter difference exists between the two end faces of the push rod, and a limit pin group is circumferentially arranged on the outer surface of the push rod; in an initial state, the limit pin group abuts against the outer surface of the end of the push rod with a larger diameter; the shear comprises a pressure-resistant tank and a cylinder body, a piston rod is arranged in the cylinder body, and the space in the cylinder body is divided into a rod chamber and a rodless chamber; wherein an electric explosion valve is arranged in the pressure-resistant tank, and the rodless chamber is connected to the external seawater environment; the rod chamber is initially full of oil, the piston rod end is connected to a blade, and the rod chamber end is provided with a knife holder matching the blade. The adaptive deployment remote trigger shear of the present invention can be remotely triggered to achieve underwater cable destruction.

Description

Technical Field

[0001] The present invention relates to the technical field of underwater cable cutting equipment, and in particular to an adaptively deployed remotely triggered shear and a deployment and cutting method thereof. Background Art

[0002] The ocean covers approximately 70.8% of the Earth's surface and contains a wealth of biological, mineral, chemical, and energy resources. Deep-sea resource development is gaining increasing attention, and human activities are becoming more frequent. A growing variety of exploration equipment, including AUVs, ROVs, and UUVs, is also being used. However, complex climate change at sea poses challenges to the operation of these devices.

[0003] Underwater operations often involve several situations: At the start of underwater operations, equipment must be secured with steel cables to prevent underwater currents from affecting operations; and after the underwater operation is completed, the equipment must be recovered, requiring the steel cables to be broken. These situations require the ROV to perform two underwater operations. In adverse sea conditions, ROV operations have a low success rate and are time-consuming. This is especially true when adverse sea conditions pose a safety threat to surface platforms, forcing the underwater equipment to be abandoned, resulting in significant financial losses.

[0004] Complex sea conditions, in particular, place extremely high demands on ROVs, resulting in long operations and low success rates. In particular, some equipment undergoes prolonged underwater testing, becoming susceptible to corrosion and marine microbial growth, making it difficult to detect cables and significantly extending equipment recovery time. Summary of the Invention

[0005] In response to the shortcomings of the above-mentioned existing production technologies, the applicant provides a rationally structured adaptive deployment remote trigger shear and its deployment and cutting method. In low-visibility underwater environments, the shear can be carried by equipment such as ROV to achieve blind hanging of underwater cables, and it also has a remote control trigger function, thereby ensuring the work of cutting cables and recovering equipment.

[0006] The technical solutions adopted in the present invention are as follows:

[0007] An adaptive deployment remote trigger shearer is used underwater with a towing ROV, comprising a shearing device, a deployment device connecting the shearing device and the towing ROV, and a hydroacoustic controller connected to the shearing device.

[0008] The deployment device comprises:

[0009] The base assembly is connected to the external traction ROV.

[0010] Hydraulic cylinder, mounted on the base assembly,

[0011] The push rod is fixed to the end of the piston rod of the hydraulic cylinder. There is a diameter difference between the two end faces of the push rod.

[0012] The limit pin group is circumferentially arranged on the outer surface of the push rod; in the initial state, the limit pin group contacts the outer surface of the end with the larger diameter of the push rod.

[0013] The shearing device includes a pressure-resistant tank and a cylinder body. The pressure-resistant tank is initially locked and connected to the laying device.

[0014] The cylinder body is located on the side of the pressure tank away from the deployment device. A piston rod is arranged in the cylinder body, dividing the space in the cylinder body into a rod chamber and a rodless chamber. An electric explosion valve is arranged in the pressure tank, and the rodless chamber is connected to the external seawater environment. The rod chamber is initially full of oil.

[0015] The end of the piston rod is connected with a blade, and the end of the rod cavity is provided with a blade seat matching the blade.

[0016] As a further improvement of the above technical solution:

[0017] The outer circular surface of the push rod is grooved, and the elastic pin falls into the groove.

[0018] The depth of the groove on the surface of the push rod gradually deepens from the end away from the hydraulic cylinder to the end close to the hydraulic cylinder.

[0019] The base assembly comprises a base body for mounting the hydraulic cylinder and a cylinder seat connected to the base body. When the piston rod of the hydraulic cylinder is extended, it passes through the cylinder seat.

[0020] The limiting pin group includes two or more elastic pins arranged in a circular array. When the elastic pins are in an initial state, both ends are embedded in the pressure tank and the cylinder seat at the same time.

[0021] The pressure-resistant tank is provided with a chamber for accommodating the movement of the push rod at one end close to the oil cylinder seat, and a spring plunger is provided on the inner wall of the chamber.

[0022] The ends of the oil cylinder seat and the pressure tank connected thereto are matched with each other on an inclined surface, and the elastic pin is passed through the matched portion of the inclined surface along the diameter direction.

[0023] The piston rod passes through one end of the rod cavity close to the knife seat, and one end of the piston rod extending out of the pressure-resistant tank is connected with the knife blade.

[0024] When the blade is in the initial position, an accommodation space is reserved between the blade and the blade holder, and the open position of the blade holder extends outward to form a guide rod.

[0025] A method for deploying and cutting using an adaptively deployed remotely triggered shearing device comprises the following steps:

[0026] Detection and deployment phase:

[0027] The ROV is used to carry the adaptive remote trigger shear into the water, and the shear is hooked at a certain angle underwater.

[0028] When the blade holder at the end of the shear is hooked onto the underwater cable, the ROV is pulled by resistance. At this time, the ROV supplies oil to the hydraulic cylinder, and the piston rod of the hydraulic cylinder pushes the push rod out.

[0029] During the extension of the push rod, the elastic pin gradually moves from the original resistance to the large end of the push rod to the small end of the push rod. There is ample space in the cylinder seat, and the elastic pin escapes from the inner wall of the pressure tank. The cylinder seat and the pressure tank are separated.

[0030] The ROV is pulled to continue moving, so that the cylinder base and the pressure tank are completely separated.

[0031] At the same time, the limiting guide sleeve gradually slides along the outer surface of the pressure tank and the cylinder body toward the knife seat. After sliding to close the open position of the knife seat, the spring plunger at the corresponding position resets to limit the relative position of the limiting guide sleeve.

[0032] Shearing stage:

[0033] After the remote shearing signal is sent, the hydroacoustic controller receives the signal, outputs voltage and current, controls the electric explosion valve to explode, and the oil in the rod chamber flows into the pressure tank. The pressure in the rod chamber becomes normal pressure, and the high pressure of seawater in the rodless chamber pushes the piston rod into the rod chamber until the blade of the piston rod extends, presses the cable against the knife seat and cuts it off.

[0034] The beneficial effects of the present invention are as follows:

[0035] In addition to its underwater cutting capabilities, this device also features underwater detection and retrieval, making it particularly suitable for tracing and recovering equipment in turbid water or after extended periods of operation. By utilizing a towing ROV to drive the shears, the shears can adaptively detect and retrieve cables in low-visibility environments. This makes deployment simple and reliable, and has promising application prospects.

[0036] In the present invention, the deployment device driven by the towing ROV needs to have the function of being able to reliably connect with the shearing device and automatically disconnect. At the same time, it is necessary to consider the impact of high pressure in the underwater environment on the connection position. Therefore, in the present invention, the power design for disconnecting the deployment device and the shearing device is placed on the external towing ROV. If the towing ROV does not supply oil, the hydraulic cylinder of the deployment device will have no power and cannot push out the piston rod, ensuring that the push rod presses the elastic pin tightly against the matching inclined surface of the cylinder seat and the pressure tank, thereby ensuring that they will not fall off from each other during the exploration and hanging process.

[0037] After the cable is hung, the ROV supplies oil, the hydraulic cylinder piston rod extends, and the push rod and the pressure tank move relative to each other, and the push rod enters the pressure tank. At this time, the spring plunger in the pressure tank presses on the surface of the push rod, and the space left for the elastic pin between the push rod and the cylinder seat gradually increases. The elastic pin loosens, and the tightening force on the pressure tank wall is removed, realizing the disengagement between the components.

[0038] The present invention also discloses a limiting guide sleeve, which is used to seal the open position of the knife seat after hooking the cable, so that the hooked cable is not easy to loosen. In order to limit the cable and facilitate the transition from the open state to the closed state, the present invention provides a guide sleeve structure. The entire sleeve is set outside the shear. When it is still in the detection and hanging stage, the limiting guide sleeve is positioned by the spring plunger and is not easy to slide to the side of the knife seat; when the push rod is gradually pushed out, the spring plunger is deformed, and the limiting guide sleeve loses the limiting force from the spring plunger, and can slide along the shear to the knife seat, closing the opening of the knife seat. At the same time, it is limited by another set of spring plungers to keep the closed state unchanged, ensuring that the subsequent shearing process proceeds smoothly.

[0039] After the laying device and the shearing device are stably separated from the present invention, the hydroacoustic controller connected to the shearing device sends a signal to control the explosion, and the shearing device can independently complete the shearing action.

[0040] The adaptively deployed remotely triggered shears of the present invention can achieve underwater cable destruction with high reliability.

[0041] The self-adaptive placement remote trigger shearing device of the present invention has a simple and compact structure, low cost and good application prospects.

[0042] The self-adaptively placed remote-trigger shears of the present invention can be triggered remotely and has good concealment. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0044] Figure 2 It is a structural schematic diagram of the disengagement of the laying device and the shearing device of the present invention.

[0045] Figure 3 Schematic diagram of the push rod structure in the present invention.

[0046] Figure 4 This is a schematic diagram of the shearing device after disengagement in the present invention, showing the shearing completion state.

[0047] Figure 5 This is a schematic diagram of the assembly of the limiting guide sleeve in the present invention, in which a cylinder is used to replace the shear.

[0048] Figure 6-1 This is a schematic diagram of the initial state of the limiting guide sleeve in the present invention.

[0049] Figure 6-2 This is a schematic diagram of the limiting guide sleeve in the present invention having closed the knife seat but not cutting the cable.

[0050] Figure 6-3 This is a schematic diagram of the final state of the shear in the present invention after the cable has been cut.

[0051] Among them: 1. Shearing device; 2. Laying device; 3. Hydroacoustic controller; 4. Guide rod; 5. Limit guide sleeve;

[0052] 101. Pressure tank; 102. Piston rod; 103. Rod chamber; 104. Rodless chamber; 105. Electric explosion valve; 106. Blade; 107. Blade holder;

[0053] 201, hydraulic cylinder; 202, push rod; 203, base body; 204, cylinder seat; 205, elastic pin; 206, spring plunger;

[0054] 202-1, limit step; 202-2, transition section;. DETAILED DESCRIPTION

[0055] The specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0056] like Figure 1 As shown in Figure 6, the adaptive deployment remote trigger shearer of this embodiment is used underwater with a towing ROV, and includes a shearing device 1, a deployment device 2 connecting the shearing device 1 and the towing ROV, a hydroacoustic controller 3 connected to the shearing device 1, and a limiting guide sleeve 5 provided on the sliding sleeve of the shearing device 1.

[0057] The deployment device 2 includes:

[0058] The base assembly is connected to the external traction ROV.

[0059] The hydraulic cylinder 201 is mounted on the base assembly.

[0060] The push rod 202 is fixed to the piston rod end of the hydraulic cylinder 201. There is a diameter difference between the two end surfaces of the push rod 202.

[0061] The limit pin group is circumferentially arranged on the outer surface of the push rod 202; in the initial state, the limit pin group contacts the outer surface of the end with the larger diameter of the push rod 202.

[0062] The shearing device 1 includes a pressure-resistant tank 101 and a cylinder body. The pressure-resistant tank 101 is initially locked and connected to the laying device 2.

[0063] The cylinder body is located on the side of the pressure tank 101 away from the deployment device 2. A piston rod 102 is provided in the cylinder body, dividing the space in the cylinder body into a rod chamber 103 and a rodless chamber 104. An electric explosion valve 105 is provided in the pressure tank 101, and the rodless chamber 104 is connected to the external seawater environment. The rod chamber 103 is initially full of oil.

[0064] The end of the piston rod 102 is connected to a blade 106, and the end of the rod cavity 103 is provided with a knife seat 107 matching the blade 106. One of the end points of the movement path of the limiting guide sleeve 5 is shielded at the open part of the knife seat 107.

[0065] The outer surface of the push rod 202 is grooved, and the elastic pin falls into the groove. The depth of the groove on the surface of the push rod 202 gradually deepens from the end away from the hydraulic cylinder 201 to the end close to the hydraulic cylinder 201. Figure 3 As shown, in this embodiment, the positions where the step surfaces are formed at both ends are named 202-1, and the middle section is named 202-2. The diameter of the transition section 202-2 near the hydraulic cylinder 201 is smaller than the diameter near the deployment device 2.

[0066] The transition section 202 - 2 is provided with two conical surfaces with the same inclination near the limiting steps 202 - 1 at both ends, and a column is formed between the two conical surfaces.

[0067] The base assembly includes a base body 203 for mounting the hydraulic cylinder 201 and a cylinder seat 204 connected to the base body 203 . When the piston rod of the hydraulic cylinder 201 is extended, it passes through the cylinder seat 204 .

[0068] The limiting pin group includes two or more elastic pins 205 arranged in a circular array. When the elastic pins 205 are in an initial state, both ends of the elastic pins 205 are embedded in the pressure tank 101 and the cylinder seat 204 at the same time.

[0069] The pressure tank 101 is provided with a chamber near one end of the oil cylinder seat 204 for accommodating the movement of the push rod 202 , and a spring plunger 206 is provided on the inner wall of the chamber.

[0070] The ends of the oil cylinder seat 204 and the pressure tank 101 are connected with each other in an inclined plane, and the elastic pin 205 is passed through the inclined plane along the diameter direction.

[0071] The piston rod 102 passes through the rod cavity 103 and is close to the blade seat 107 . The end of the piston rod 102 extending out of the pressure-resistant tank 101 is connected to the blade 106 .

[0072] When the blade 106 is in the initial position, an accommodation space is reserved between the blade 106 and the blade holder 107 , and the open position of the blade holder 107 extends outward to form a guide rod 4 .

[0073] The method for deploying and cutting using an adaptively deployed remotely triggered shear in this embodiment includes the following steps:

[0074] Detection and deployment phase:

[0075] The ROV is used to carry the adaptive remote trigger shear into the water, and the shear is hooked at a certain angle underwater.

[0076] When the blade holder 107 at the end of the shear is hooked onto the underwater cable, the traction ROV encounters resistance. At this time, the traction ROV supplies oil to the hydraulic cylinder 201, and the piston rod of the hydraulic cylinder 201 pushes the push rod 202 to extend.

[0077] During the extension of the push rod 202, the elastic pin 205 gradually moves from the original resistance to the large end of the push rod 202 to the small end of the push rod 202. There is ample space in the cylinder seat 204, and the elastic pin 205 is released from the inner wall of the pressure tank 101. The cylinder seat 204 and the pressure tank 101 are separated.

[0078] The ROV is pulled to continue moving, so that the cylinder base 204 and the pressure tank 101 are completely separated.

[0079] At the same time, the limiting guide sleeve (5) gradually slides along the outer surface of the pressure-resistant tank (101) and the cylinder body toward the knife seat (107). After sliding to close the open position of the knife seat (107), the spring plunger (206) at the corresponding position is reset to limit the relative position of the limiting guide sleeve (5).

[0080] Shearing stage:

[0081] After the remote shearing signal is sent, the underwater acoustic controller 3 receives the signal, outputs voltage and current, controls the electric explosion valve 105 to explode, and the oil in the rod chamber 103 flows into the pressure tank 101. The pressure in the rod chamber 103 becomes normal pressure, and the high pressure of seawater in the rodless chamber 104 pushes the piston rod 102 into the rod chamber 103 until the blade 106 of the piston rod 102 extends, presses the cable against the knife seat 107 and cuts it off.

[0082] The specific structure and working process of the present invention are as follows:

[0083] like Figure 1 and Figure 2 As shown in the figure, the adaptive deployment remote trigger shear provided by the present invention consists of a deployment device 2 and a shearing device 1. The shearing device 1 is the part that receives remote signals, and controls the implementation of the shearing action by receiving external signals through the hydroacoustic controller 3 connected to the shearing device 1.

[0084] The laying device 2 is used for the detection and hanging process before shearing.

[0085] The deployment device 2 is used with a power device, such as a towing ROV. The towing ROV drives the deployment device 2 and the shearing device 1, which is also connected to the deployment device 2, to navigate underwater, searching for cables and probing for hooks at a certain angle. For example, during a dive, the device can search for hooks underwater near the expected location in a downward direction, achieving a blind hooking of the underwater cable.

[0086] The base body 203 and the cylinder seat 204 of the deployment device 2 are fixedly connected by screws, the hydraulic cylinder 201 is fixed to the cylinder seat 204 by screws, and the push rod 202 is fixed to the piston rod 102 of the hydraulic cylinder 201 by screws. The hydraulic cylinder 201 drives the push rod 202 to reciprocate.

[0087] When the shears' blade holder 107 is hooked onto the cable, the traction ROV feels forward resistance and supplies oil to the hydraulic cylinder 201, extending the piston rod 102 of the hydraulic cylinder 201 so as to disengage the cylinder holder 204 and the pressure tank 101.

[0088] The end of the oil cylinder seat 204 facing away from the base body 203 is connected to the pressure tank 101 of the shearing device 1. The pressure tank 101 is provided with an area for accommodating the extended piston rod 102. In this area, a plurality of spring plungers 206 are provided on the wall. When the push rod 202 is extended, the spring plungers 206 are pressed against the push rod 202. An elastic pin 205 is provided at the matching inclined surface between the pressure tank 101 and the oil cylinder seat 204. The initial state of the elastic pin 205 is that one end is embedded in the oil cylinder seat 204 and pressed against the push rod 202, and the other end is embedded and pressed against the wall of the pressure tank 101. When the push rod 202 begins to extend, the relative position of the elastic pin 205 is shown as follows: Figure 3 The outer wall of the push rod 202 shown gradually moves to the small end of the push rod 202, so that the area between the push rod 202 and the cylinder seat 204 becomes larger, the elastic pin 205 retracts, and the tightening force on the wall of the pressure tank 101 is removed, and the pressure tank 101 can be disengaged from the cylinder seat 204.

[0089] At the same time as the release, the limiting guide sleeve 5 also has a sliding action. Figure 5 As shown, the initial state of the limiting guide sleeve 5 is limited by the spring plunger 206 on the wall of the pressure tank 101; there are two groups of spring plungers 206, which are arranged along the axis of the shear, one group is close to the laying device, and the other group is close to the knife seat. Each group of spring plungers 206 is provided with at least one, and according to the actual working conditions, two or more spring plungers 206 can be provided in each group. The spring plunger 206 close to the laying device 2 is used to position the limiting guide sleeve 5 in the middle section of the shear, at this time, the end rod of the limiting guide sleeve 5 does not close the open part of the knife seat 107; as shown Figure 6-1 to Figure 6-3As shown, when the push rod 202 moves and gradually drives the spring plunger 206 to deform, the spring plunger 206 that originally blocked the limiting guide sleeve 5 loses its limiting force, and the limiting guide sleeve 5 slides until its end rod blocks the open position of the knife seat 107, fixing the cable; the spring plunger 206 close to the side of the knife seat 107 is reset and blocks the limiting guide sleeve 5 again. At this time, the limiting guide sleeve 5 is fixed in the state of closing the knife seat 107.

[0090] The shearing device 1 uses the high pressure of external seawater to push the piston rod 102 and the blade 106 to cut the cable. The specific principle is:

[0091] The pressure tank 101 is divided into two main working areas, one is Figure 1 and Figure 4 The chamber shown is used to accommodate the electric explosion valve 105, and the other chamber is divided into a rod chamber 103 and a rodless chamber 104 by the piston rod 102. Figure 1 In the middle state, the piston rod 102 is attached to the left side of the center in the figure, and the rodless cavity 104 is pressed tightly; Figure 4 The middle piston rod 102 has moved to the right side in the figure, and the rod cavity 103 is almost completely occupied.

[0092] by Figure 2 For example, at this time, the shear has been hung on the cable, and the laying device 2 is also ready to be disengaged. When the laying device 2 is completely disengaged, a command is issued, the hydroacoustic receiver receives the signal, outputs voltage and current, and the electric explosion valve 105 starts to work. After the electric explosion valve 105 explodes, the original barrier between the oil in the rod chamber 103 and the pressure tank 101 is exploded, and the oil in the rod chamber 103 flows into the pressure tank 101. At this time, the pressure in the rod chamber 103 gradually decreases to normal pressure; and the rodless chamber 104 is connected to the outside seawater through the sea port, and has seawater pressure. The seawater pressure pushes the piston rod 102 to Figure 4 During this process, the blade 106 gradually presses against the cable until the cable is abutted against the blade holder 107 and cut off, completing the work of the broken cable recovery device.

[0093] The adaptively deployed remote-triggered shear provided by the present invention can achieve underwater cable destruction with high reliability, and is particularly suitable for underwater cable cutting conditions in turbid water or underwater cable cutting conditions that are covered and difficult to identify after long-term operation.

[0094] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any modifications may be made within the scope of protection of the present invention.

Claims

1. An adaptive deployment remote trigger shear, characterized by: The device is used underwater in conjunction with a towing ROV and comprises a shearing device (1), a deployment device (2) connecting the shearing device (1) and the towing ROV, the shearing device (1) being connected to an underwater acoustic controller (3), and a sliding sleeve on the shearing device (1) being provided with a limiting guide sleeve (5). The placing device (2) comprises: The base assembly is connected to the external traction ROV. The hydraulic cylinder (201) is provided on the base assembly. The push rod (202) is fixed to the end of the piston rod of the hydraulic cylinder (201), and there is a diameter difference between the two end surfaces of the push rod (202). The limit pin group is circumferentially arranged on the outer surface of the push rod (202); in the initial state, the limit pin group contacts the outer surface of the end of the push rod (202) with a larger diameter. The shearing device (1) comprises a pressure-resistant tank (101) and a cylinder body. The pressure-resistant tank (101) is locked and connected to the laying device (2) in an initial state. The cylinder body is located on the side of the pressure-resistant tank (101) away from the deployment device (2), and a piston rod (102) is provided in the cylinder body, dividing the space in the cylinder body into a rod chamber (103) and a rodless chamber (104); an electric explosion valve (105) is provided in the pressure-resistant tank (101), and the rodless chamber (104) is communicated with the external seawater environment; the rod chamber (103) is initially in a full oil state, The end of the piston rod (102) is connected to a blade (106), and the end of the rod cavity (103) is provided with a blade holder (107) matching the blade (106); one of the end points of the movement path of the limiting guide sleeve (5) is shielded at the opening of the blade holder (107).

2. The adaptive deployment remote trigger shear according to claim 1, characterized in that: The outer surface of the push rod (202) is grooved, and the elastic pin falls into the groove.

3. The adaptive deployment remote trigger shear according to claim 2, characterized in that: The depth of the groove on the surface of the push rod (202) gradually increases from the end away from the hydraulic cylinder (201) to the end close to the hydraulic cylinder (201).

4. The adaptive deployment remote trigger shear according to claim 1, characterized in that: The base assembly comprises a base body (203) for mounting a hydraulic cylinder (201), and a cylinder seat (204) connected to the base body (203); when the piston rod of the hydraulic cylinder (201) extends, it penetrates the cylinder seat (204).

5. The adaptive deployment remote trigger shear according to claim 4, characterized in that: The limiting pin group comprises a plurality of elastic pins (205) arranged in a circular array. When the elastic pins (205) are in an initial state, both ends are embedded in the pressure tank (101) and the oil cylinder seat (204) at the same time.

6. The adaptive deployment remote trigger shear according to claim 4, characterized in that: The pressure-resistant tank (101) is provided with a chamber for accommodating the movement of the push rod (202) at one end close to the oil cylinder seat (204), and the inner wall of the chamber is provided with a spring plunger (206).

7. The adaptive deployment remote trigger shear according to claim 6, characterized in that: The ends of the oil cylinder seat (204) and the pressure tank (101) connected thereto are beveled and matched, and the elastic pin (205) is passed through the beveled matching position along the diameter direction.

8. The adaptive deployment remote trigger shear according to claim 1, characterized in that: The piston rod (102) passes through one end of the rod cavity (103) close to the blade seat (107), and one end of the piston rod (102) extends out of the pressure-resistant tank (101) and is connected to the blade (106).

9. The adaptive deployment remote trigger shear according to claim 8, characterized in that: When the blade (106) is in the initial position, an accommodation space is reserved between the blade (106) and the blade holder (107), and the open position of the blade holder (107) extends outward to form a guide rod (4).

10. A method for laying and cutting using the adaptively laid remotely triggered shearing device according to claim 1, characterized in that: The steps include: Detection and deployment phase: The ROV is used to carry the adaptive remote trigger shear into the water, and the shear is hooked at a certain angle underwater. When the blade holder (107) at the end of the shear is hooked on the underwater cable, the traction ROV encounters resistance. At this time, the traction ROV supplies oil to the hydraulic cylinder (201), and the piston rod of the hydraulic cylinder (201) pushes the push rod (202) to extend. During the extension of the push rod (202), the elastic pin (205) gradually moves from the original contact with the large end of the push rod (202) to the small end of the push rod (202). When there is sufficient space in the oil cylinder seat (204), the elastic pin (205) is released from the inner wall of the pressure tank (101), and the oil cylinder seat (204) and the pressure tank (101) are separated. The ROV is pulled to continue moving, so that the oil cylinder seat (204) and the pressure tank (101) are completely separated. At the same time, the limiting guide sleeve (5) gradually slides along the outer surface of the pressure-resistant tank (101) and the cylinder body toward the knife seat (107). After sliding to close the open position of the knife seat (107), the spring plunger (206) at the corresponding position is reset to limit the relative position of the limiting guide sleeve (5). Shearing stage: After the remote shearing signal is sent, the underwater acoustic controller (3) receives the signal, outputs voltage and current, controls the electric explosion valve (105) to explode, and the oil in the rod chamber (103) flows into the pressure-resistant tank (101). The pressure in the rod chamber (103) becomes normal pressure, and the high pressure of seawater in the rodless chamber (104) pushes the piston rod (102) to move into the rod chamber (103) until the blade (106) of the piston rod (102) extends, presses the cable against the knife seat (107), and cuts it.

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