A non-powered cutting device for deep sea environments

Abstract

The present invention relates to a non-powered cutting device for deep-sea environments, comprising a cylindrical hollow cylinder, a piston rod fitted inside the cylinder, a cutting blade symmetrically fitted at the end of the piston rod skirt, an outer circumferential surface of the piston rod skirt fitted with the inner side wall of the cylinder via a sealing assembly, a cover fitted at the top end of the cylinder exterior via a sealing ring, a mounting through hole for mounting a switch shaft provided inside the cover, a switch hole also provided inside the cover, a plug mounting hole provided on the side wall of the cylinder, and when the piston rod is in an initial position, the plug mounting hole connects the outside with the inside of the cylinder, a plug is fitted in the plug mounting hole, and the plug isolates the inside of the cylinder from the outside. By providing the cylinder, piston, cover, and switch shaft, the cutting device can complete the cutting task without the need for a drive device, reducing the mass and load of the auxiliary equipment, thereby alleviating the burden on the submersible.

Description

Technical Field

[0001] The present invention relates to the technical field of submersible auxiliary equipment, in particular to a non-powered cutting device for use in deep-sea environments. Background Art

[0002] Cutting devices are common tools for submersibles. When a submersible is performing underwater operations, in case of emergency, it is necessary to use the cutting device to cut off the cables of its own equipment and abandon the equipment to obtain more positive buoyancy and ensure the safety of underwater operations. When a submersible is rescuing other underwater equipment, it is usually also used to cut off cables and other items that hinder the mission.

[0003] Underwater cutting methods primarily fall into three categories: explosive cutting, thermal cutting, and cold cutting. Existing cutting devices require power from electrical or hydraulic drives. Consequently, these cutting devices often require extensive equipment, burdening the submersible and reducing its efficiency and flexibility. Furthermore, these cutting devices consume energy from the submersible's batteries or the mother ship, reducing the submersible's underwater operating time. Summary of the Invention

[0004] In response to the shortcomings of the above-mentioned existing production technologies, the applicant provides a rationally structured unpowered cutting device for deep-sea environments. By rationally configuring the mechanical structure, the static pressure of seawater is used as the cutting driving force, so that the cutting device does not need to be equipped with an additional driving device in the deep-sea environment and does not need to consume the energy of the submersible, thereby reducing the burden on the submersible, ensuring that the submersible's own energy is maximized to perform underwater tasks, and improving the working efficiency and flexibility of the submersible.

[0005] The technical solutions adopted in the present invention are as follows:

[0006] A non-powered cutting device for deep-sea environments, comprising a cylindrical hollow cylinder, a piston rod fitted inside the cylinder, a piston ring fitted between the head of the piston rod and the inner side wall of the cylinder, a step provided inside the cylinder to hinder movement of the piston rod head, the end of the piston rod skirt extending out of the cylinder, a cutting knife symmetrically mounted on the end of the piston rod skirt, the cutting knife guided by a guide frame to cut a workpiece, the guide frame fitted to the bottom end of the cylinder exterior via a threaded connector, the outer circumferential surface of the piston rod skirt fitted to the inner side wall of the cylinder via a sealing assembly, the piston rod skirt having a diameter smaller than the piston rod head diameter;

[0007] The top end of the outer portion of the cylinder is fitted with a cover body through a sealing ring. The interior of the cover body is provided with a mounting through-hole for mounting a switch shaft. The switch shaft is cylindrical. The interior of the cover body is further provided with a switch hole. The switch hole communicates with the interior of the cylinder and the mounting through-hole. The switch hole is vertically arranged in the middle of the mounting through-hole. An array of high-pressure sealing components is provided between the switch shaft and the inner side wall of the mounting through-hole. The high-pressure sealing components and the switch shaft isolate the switch hole from the outside world.

[0008] A plug mounting hole is provided on the side wall of the cylinder. When the piston rod is in the initial position, the plug mounting hole connects the outside with the inside of the cylinder. A plug is installed in the plug mounting hole to isolate the inside of the cylinder from the outside.

[0009] A further technical solution of the present invention is:

[0010] The end of the piston rod skirt is provided with a symmetrical wedge-shaped groove, and the piston rod is mounted in cooperation with the corresponding cutting knife through the wedge-shaped groove.

[0011] The structure of a single cutting knife is as follows: it includes a cutting knife body, the top of the cutting knife body is provided with a wedge block corresponding to the wedge groove, the bottom of the cutting knife body is provided with two mutually perpendicular cutting surfaces, and the connection between the two cutting surfaces forms a blade.

[0012] The structure of the guide frame is as follows: it includes a connecting plate installed in cooperation with the cylinder, a first working through hole for passing the piston rod and the cutting knife is opened in the middle of the connecting plate, and a U-shaped guide plate is installed in cooperation with the bottom end of the connecting plate, and the end face of the guide plate is opened with a square working through groove, and the inner side wall of the working through groove is symmetrically provided with several guide grooves. When cutting the workpiece, the cutting knife moves forward in a straight line along the corresponding guide groove, and a pad groove is also provided on the inner side wall of the working through groove, and an opening is provided on the side wall of the guide plate.

[0013] A backing plate is installed in the backing plate groove. The material of the backing plate is soft metal. When the cutting knife cuts the workpiece, the blade of the cutting knife is squeezed into the backing plate to a certain depth.

[0014] A guide block is mounted in cooperation with the opening.

[0015] The guide block is provided with a groove corresponding to the guide slot.

[0016] A buffer pad is provided on the step.

[0017] A limiting cover for limiting the high-pressure sealing component is mounted on the cover body.

[0018] The end of the switch shaft is provided with a pull ring.

[0019] The beneficial effects of the present invention are as follows:

[0020] The present invention has a compact and reasonable structure and is easy to operate. By arranging a cylinder, a piston, a cover body and a switch shaft, the cutting device can complete the cutting task without being driven by a driving device, reducing the mass and load of the auxiliary equipment, thereby reducing the burden on the submersible; and the cutting device does not need to consume additional energy of the submersible, which can ensure that the submersible's own electricity is maximized to perform underwater tasks, thereby improving the working efficiency and flexibility of the submersible.

[0021] The present invention also has the following advantages:

[0022] (1) The present invention adopts a double-knife cutting method to produce a certain fixing effect on the workpiece to be cut, so that the workpiece does not slide significantly during the cutting process, and the cutting surface is closer to the minimum cross-section of the workpiece, thereby ensuring the success rate of cutting.

[0023] (2) When the cutting knife in the present invention cuts the workpiece, the blade is squeezed against the metal pad, so that the cutting device can cut the workpiece with high strength and ultra-fine fiber filaments, avoiding the lingering of the workpiece after cutting, making the cutting more thorough, and the cutting knife 3 adopts a 90° blade, which can ensure that the forces on both sides of the blade are symmetrical when the blade is squeezed against the pad.

[0024] (3) The present invention is provided with a working groove. When cutting a workpiece, the workpiece is placed in the working groove for cutting, so that the cutting device can cut multiple workpieces and multiple cables at one time to meet different cutting requirements.

[0025] (4) The present invention provides an opening on the guide frame and is provided with a guide block. The opening facilitates the placement or removal of the workpiece from the working slot. The guide block can be pre-installed at the opening when the cutting device cuts a determined and accessible workpiece, which can make the cutting knife move more smoothly. When the cutting device temporarily performs a cutting task, the guide block is not installed, which facilitates the placement of the workpiece from the opening into the working slot, thereby improving the flexibility of the cutting device.

[0026] (5) The present invention provides multi-stage sealing and adopts threaded fasteners to ensure reliable and tight connection of structural parts, so as to be suitable for deep-sea environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present invention.

[0028] Figure 2 It is an exploded view of the present invention.

[0029] Figure 3 for Figure 1 main view.

[0030] Figure 4 for Figure 1 Top view of .

[0031] Figure 5 for Figure 4 Cross-sectional view of section AA.

[0032] Figure 6 for Figure 1 Middle side view.

[0033] Figure 7 It is a structural schematic diagram of the cylinder in the present invention.

[0034] Figure 8 for Figure 7 Top view of .

[0035] Figure 9 for Figure 8 Cross-sectional view of section BB.

[0036] Figure 10 Schematic diagram of the structure of the piston rod in the present invention.

[0037] Figure 11 It is a structural schematic diagram of the cutting knife in the present invention.

[0038] Figure 12 for Figure 11 main view.

[0039] Figure 13 Schematic diagram of the structure of the guide frame of the present invention.

[0040] Figure 14 It is a structural schematic diagram of the cover body in the present invention.

[0041] Figure 15 for Figure 14 side view.

[0042] Figure 16 for Figure 15 Cross-sectional view of section CC.

[0043] Figure 17 This is a schematic diagram of the principle of cutting a workpiece according to the present invention.

[0044] Wherein: 1. Cylinder; 2. Piston rod; 3. Cutting blade; 4. Guide frame; 5. Guide block; 6. Backing plate; 7. Cover; 8. Switch shaft; 9. Limit cover; 10. Plug; 11. Sealing ring; 12. Sealing assembly; 13. Piston ring; 14. Pull ring; 15. Buffer pad; 16. High-pressure sealing assembly; 17. Switch hole; 18. Step; 19. Mounting through hole; 20. Plug mounting hole; 21. Workpiece

[0045] 201, wedge-shaped groove;

[0046] 301, cutting blade body; 302, wedge block; 303, cutting surface;

[0047] 401. Connecting plate; 402. Working through hole; 403. Guide plate; 404. Working through groove; 405. Opening; 406. Guide groove; 407. Pad groove. DETAILED DESCRIPTION

[0048] The specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0049] The structure and function of the present invention are as follows:

[0050] like Figures 1-16 As shown, a non-powered cutting device for deep-sea environment includes a cylindrical and hollow cylinder 1, a piston rod 2 is installed inside the cylinder 1, the head of the piston rod 2 and the inner wall of the cylinder 1 are installed through a piston ring 13, a step 18 is provided inside the cylinder 1 to hinder the movement of the head of the piston rod 2, the end of the skirt of the piston rod 2 extends out of the cylinder 1, and a cutting knife 3 is symmetrically installed on the end of the skirt of the piston rod 2. The cutting knife 3 is guided by a guide frame 4 to cut a workpiece 21, and the guide frame 4 is installed at the bottom end of the outside of the cylinder 1 through a threaded connection. The outer circumferential surface of the skirt of the piston rod 2 is installed with the inner wall of the cylinder 1 through a sealing assembly 12, and the diameter of the skirt of the piston rod 2 is smaller than the diameter of the head of the piston rod 2. A flange is provided at the bottom end of the outside of the cylinder 1, which is installed in conjunction with the connecting plate 401 of the guide frame 4, and the connection is stable and reliable; when the piston rod 2 moves, the cutting knife 3 drives the cutting knife 3 to move in the guide frame 4. Under the thrust generated by the hydrostatic pressure in the deep sea environment, the cutting knife 3 cuts the workpiece 21 placed in the guide frame 4. The workpiece 21 is often a cable.

[0051] The top end of the outer shell 1 is fitted with a cover 7 via a sealing ring 11. A mounting hole 19 for mounting the switch shaft 8 is provided inside the cover 7. The switch shaft 8 is cylindrical. A switch hole 17 is also provided inside the cover 7. The switch hole 17 connects the interior of the shell 1 with the mounting hole 19. The switch hole 17 is arranged vertically in the middle of the mounting hole 19. An array of high-pressure sealing assemblies 16 are provided between the switch shaft 8 and the inner sidewall of the mounting hole 19. The high-pressure sealing assemblies 16 and the switch shaft 8 isolate the switch hole 17 from the outside world. The cover 7 includes a switch hole 17 and a mounting hole 19. The mounting hole 19 is directly connected to the outside world, while the switch hole 17 is connected to the outside world via the mounting hole 19. The mounting hole 19 is used to mount the switch shaft 8. The high-pressure sealing assembly 16 can be sealed using sealing rings, guide rings, etc., and controls the gap between the switch shaft 8 and the mounting hole 19 to ensure a good sealing effect.

[0052] A plug mounting hole 20 is provided on the side wall of the cylinder 1. When the piston rod 2 is in the initial position, the plug mounting hole 20 connects the outside world with the inside of the cylinder 1. The plug mounting hole 20 is fitted with a plug 10, which isolates the inside of the cylinder 1 from the outside world. The cylinder 1 and the cover 7 are fitted together with threaded fasteners, and a sealing ring 11 is provided to ensure the watertightness of the inside of the cylinder 1 and prevent external seawater from entering the cylinder 1 from the connection between the cylinder 1 and the cover 7 when the cutting device is working. Two seals are provided between the cylinder 1 and the piston rod 2, namely a sealing assembly 12 and a piston ring 13. The piston ring 13 divides the cylinder 1 into two mutually unconnected cavities. The sealing assembly 12 prevents external seawater from entering the cylinder from the opening at the bottom of the cylinder 1. The plug 10 is mounted on the cylinder 1 through the plug mounting hole 20.

[0053] There are two sealed cavities in the cutting device, namely the left cavity formed by the cylinder 1, the piston rod 2 and the cover body 7, and the right cavity formed by the cylinder 1, the piston rod 2 and the plug 10; when the piston rod 2 is in the initial position, the top of the piston rod 2 is in contact with the cover body 7, and the pressure in the right cavity is normal pressure; at the same time, the wall where the cover body 7 contacts the piston rod 2 is provided with a groove to ensure that the piston rod 2 can move smoothly under the push of the static pressure of seawater.

[0054] In a deep-sea working environment, the cutting device uses the hydrostatic pressure of the deep sea as a power source. There is a large pressure difference between the cavity inside the cylinder 1 and the external seawater. When the pressure in the left cavity increases as the switch shaft 8 is pulled out, a pressure difference is generated between the cavity on the right side, and the piston rod 2 moves under the action of the hydrostatic pressure, and drives the cutting knife 3 to move to realize the cutting function.

[0055] The switch shaft 8 controls the connection and disconnection of the switch hole 17 inside the cover body 7 with the outside world; the cavity of the cover body 7 and the cylinder body 1 is filled with normal pressure air. In a deep-sea working environment, when the switch shaft 8 is pulled out and the switch hole 17 is connected to the outside world, the high hydrostatic pressure of the outside world will push the piston rod 2 to move, and it can move to the position of the step 18 to complete the maximum stroke; in a deep-sea environment, both ends of the switch shaft 8 are subjected to the deep-sea hydrostatic pressure. By setting two sets of high-pressure sealing assemblies 16 and making the two sets of high-pressure sealing assemblies 16 symmetrical about the center line of the switch hole 17, the pressure areas of the switch shaft 8 at two locations in the mounting through hole 19 are the same, so that the pressure equivalent areas at both ends of the switch shaft 8 are the same, thereby ensuring that the switch shaft 8 will not move under the action of hydrostatic pressure, and the force pulling the switch shaft 8 will not increase due to the increase of hydrostatic pressure.

[0056] When the cutting device is working, the plug 10 isolates the air in the cylinder 1 from the external seawater; when the cutting device is assembled, the plug 10 needs to be removed to facilitate the adjustment of the position of the piston rod 2 in the cylinder 1; when the cutting device is started, the air in the right cavity of the cylinder 1 will be squeezed into the plug mounting hole 20, that is, after the plug 10 is installed, there is still a part of the space in the plug mounting hole 20 so that the air in the cylinder 1 can be compressed to this point, so that the piston rod 2 can move to the position of the step 18.

[0057] The end of the piston rod 2's skirt is provided with symmetrical wedge-shaped grooves 201, through which the piston rod 2 is mounted with the corresponding cutter 3. The piston rod 2 and cutter 3 are mounted together via a pin. The wedge-shaped grooves 201 are used to cooperate with wedge blocks 302 to limit the freedom of the cutter 3 in all directions except the axial direction of the piston rod 2. The wedge-shaped grooves 201 and wedge blocks 302 form an interference fit, ensuring that the movement direction of the cutter 3 is not deviated.

[0058] The structure of a single cutting blade 3 is as follows: it includes a cutting blade body 301, the top of which is provided with a wedge-shaped block 302 corresponding to the wedge-shaped groove 201, and the bottom of the cutting blade body 301 is provided with two mutually perpendicular cutting surfaces 303, the connection between the two cutting surfaces 303 forming a cutting edge. The provision of two cutting blades 3 reduces the possibility of incomplete severing of the workpiece 21; at the same time, the two side-by-side cutting blades 3 have a certain fixing effect on the workpiece 21, preventing the workpiece 21 from sliding significantly during the cutting process, and the cut cross-section is closer to the minimum cross-section of the workpiece 21. The cutting blade 3 uses a 90-degree blade, which ensures that the forces on both sides of the blade are symmetrical when the blade is pressed against the backing plate 6.

[0059] The structure of the guide frame 4 is as follows: it includes a connecting plate 401 installed in cooperation with the cylinder 1, a first working through hole 402 for passing the piston rod 2 and the cutting knife 3 is opened in the middle of the connecting plate 401, and a U-shaped guide plate 403 is installed in cooperation with the bottom end of the connecting plate 401, and the end face of the guide plate 403 is opened with a square working groove 404, and the inner side wall of the working groove 404 is symmetrically provided with several guide grooves 406. When cutting the workpiece 21, the cutting knife 3 moves forward in a straight line along the corresponding guide groove 406, and a pad groove 407 is also provided on the inner side wall of the working groove 404, and an opening 405 is provided on the side wall of the guide plate 403; the guide groove 406 is used to guide the cutting knife 3 to move in a predetermined direction and space; one side of the guide frame 4 is open and is provided with an opening 405 for placing and removing the cut workpiece 21.

[0060] A backing plate 6 is mounted within the backing plate slot 407. This backing plate 6 is made of a soft metal. When the cutter 3 cuts the workpiece 21, the blade of the cutter 3 presses into the backing plate 6 to a certain depth. The backing plate 6 is a relatively soft metal material, installed within the backing plate slot 407 with an interference fit. It serves as the final stop for the cutter 3 at the end of the cutting process; to ensure that the workpiece 21 is completely severed, the blade of the cutter 3 presses into the backing plate 6 to a certain depth.

[0061] The opening 405 is fitted with a guide block 5 ; the guide block 5 is provided with a groove corresponding to the guide slot 406 . The guide block 5 seals the opening 405 to prevent the workpiece 21 from slipping out of the cutting range due to external forces during cutting. For a workpiece 21 that is already positioned and within reach, the workpiece 21 can be pre-placed within the working slot 404 of the guide frame 4 and the guide block 5 installed at the opening 405 of the guide frame 4 . For temporary workpieces 21 to be cut, the guide block 5 is not pre-installed at the opening 405 .

[0062] A buffer pad 15 is provided on the step 18. Under high hydrostatic pressure, the movement speed of the piston rod 2 is faster, and the buffer pad 15 is provided to withstand the impact of the piston rod 2 to avoid damage after the piston rod 2 collides with the cylinder 1.

[0063] A limiting cover 9 for limiting the high pressure sealing assembly 16 is installed on the cover body 7. The limiting cover 9 is installed on the cover body 7 by a threaded fastener to limit and protect the high pressure sealing assembly 16.

[0064] The end of the switch shaft 8 is provided with a pull ring 14. The pull ring 14 is used to pull out the switch shaft 8. The switch shaft 8 is also provided with two mounting holes for installing limit pins. The limit pins are used to limit the displacement of the switch shaft 8 to prevent the switch shaft 8 from being pulled out by mistake or deviating from its position due to external force.

[0065] The working process of the present invention is as follows:

[0066] like Figure 17 As shown, the workpiece 21 to be cut is a cable. Before entering the water for cutting, the piston rod 2 is adjusted to the initial position and the plug 10 is installed in the plug installation hole 20;

[0067] Place the cable into the working slot 404 of the guide frame 4 through the opening 405, and then install the guide block 5 at the opening 405 of the guide plate 403 using threaded fasteners;

[0068] The cutting device is placed in a deep-sea environment, and the switch shaft 8 is pulled out by the pull ring 14. The seawater in the deep sea flows into the interior of the cover body 7 through the mounting hole 19 and the switch hole 17, and squeezes the top of the piston rod 2, causing the piston rod 2 to move along its axial direction and drive the two cutting knives 3 to move along the two guide grooves 406 respectively, so that the blades of the cutting knives 3 cut the cable.

[0069] The present invention rationally arranges the cylinder 1, piston rod 2 and cover 7 and the openings and seals therein, so that the cutting device only needs an external triggering action to cut the workpiece 21 such as the cable with the help of the hydrostatic pressure in the deep sea, without the need for the submersible to provide additional energy; in the ocean, for every hundred meters increase in seawater depth, the corresponding hydrostatic pressure will increase by no less than one megapascal. The present invention rationally utilizes the hydrostatic pressure of the ocean according to usage requirements, adapts to local conditions, and is cleverly designed, saving space and energy for the submersible.

[0070] 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. A non-powered cutting device for deep-sea environments, characterized by: The invention comprises a cylindrical and hollow cylinder (1), a piston rod (2) being mounted inside the cylinder (1), a piston ring (13) being mounted between the head of the piston rod (2) and the inner wall of the cylinder (1), a step (18) being provided inside the cylinder (1) to hinder the movement of the head of the piston rod (2), the end of the skirt of the piston rod (2) extending out of the cylinder (1), a cutting knife (3) being symmetrically mounted on the end of the skirt of the piston rod (2), the cutting knife (3) being guided by a guide frame (4) to cut a workpiece (21), the guide frame (4) being mounted on the bottom end of the outside of the cylinder (1) through a threaded connection, the outer circumferential surface of the skirt of the piston rod (2) being mounted on the inner wall of the cylinder (1) through a sealing assembly (12), the diameter of the skirt of the piston rod (2) being smaller than the diameter of the head of the piston rod (2); The top end of the outer portion of the cylinder (1) is fitted with a cover (7) through a sealing ring (11). The interior of the cover (7) is provided with a mounting through hole (19) for mounting a switch shaft (8). The switch shaft (8) is cylindrical. The interior of the cover (7) is further provided with a switch hole (17). The switch hole (17) communicates with the interior of the cylinder (1) and the mounting through hole (19). The switch hole (17) is arranged vertically in the middle of the mounting through hole (19). An array of high-pressure sealing components (16) is provided between the switch shaft (8) and the inner side wall of the mounting through hole (19). The high-pressure sealing components (16) and the switch shaft (8) isolate the switch hole (17) from the outside. A plug mounting hole (20) is provided on the side wall of the cylinder (1). When the piston rod (2) is in the initial position, the plug mounting hole (20) connects the outside with the inside of the cylinder (1). The plug mounting hole (20) is matched with a plug (10) and the plug (10) isolates the inside of the cylinder (1) from the outside. The end of the skirt of the piston rod (2) is provided with a symmetrical wedge-shaped groove (201). The piston rod (2) is matched with the corresponding cutting knife (3) through the wedge-shaped groove (201). The structure of a single cutting knife (3) is as follows: it includes a cutting knife body (301), the top end of the cutting knife body (301) is provided with a wedge block (302) corresponding to the wedge-shaped groove (201), and the bottom end of the cutting knife body (301) is provided with two mutually perpendicular cutting surfaces (303), and the connection between the two cutting surfaces (303) forms a blade.

2. The unpowered cutting device for deep-sea environments according to claim 1, characterized in that: The guide frame (4) has the following structure: it comprises a connecting plate (401) mounted in cooperation with the cylinder (1); a first working through hole (402) for passing the piston rod (2) and the cutting knife (3) is provided in the middle of the connecting plate (401); a U-shaped guide plate (403) is mounted in cooperation with the bottom end of the connecting plate (401); a square working through groove (404) is provided on the end face of the guide plate (403); a plurality of guide grooves (406) are symmetrically provided on the inner side wall of the working through groove (404); when cutting the workpiece (21), the cutting knife (3) moves forward in a straight line along the corresponding guide groove (406); a pad groove (407) is further provided on the inner side wall of the working through groove (404); and an opening (405) is provided on the side wall of the guide plate (403).

3. The unpowered cutting device for deep-sea environments according to claim 2, characterized in that: A backing plate (6) is installed in the backing plate groove (407). The backing plate (6) is made of soft metal. When the cutting knife (3) cuts the workpiece (21), the blade of the cutting knife (3) is squeezed into the backing plate (6) to a certain depth.

4. The unpowered cutting device for deep-sea environments according to claim 2, characterized in that: The opening (405) is fitted with a guide block (5).

5. The unpowered cutting device for deep-sea environment according to claim 4, characterized in that: The guide block (5) is provided with a groove corresponding to the guide groove (406).

6. The unpowered cutting device for deep-sea environment according to claim 1, characterized in that: A buffer pad (15) is provided on the step (18).

7. The unpowered cutting device for deep-sea environment according to claim 1, characterized in that: A limiting cover (9) for limiting the high-pressure sealing component (16) is mounted on the cover body (7).

8. The unpowered cutting device for deep-sea environment according to claim 1, characterized in that: The end of the switch shaft (8) is provided with a pull ring (14).

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