A full-depth anti-stall underwater cutting device

Abstract

This application provides a full-ocean-depth anti-stagnation underwater cutting device, belonging to the field of underwater device engineering application technology. It includes a drive unit, an inner magnetic coupler, an outer magnetic coupler, and a saw blade. The inner magnetic coupler is rigidly connected to the drive shaft. The inner and outer magnetic couplers transmit torque non-contactly through a magnetic field generated by a magnet, causing the saw blade and outer magnetic coupler to rotate synchronously for cutting. When the saw blade suddenly stops (stagnates) during underwater operation due to unexpected situations such as cutting foreign objects or getting stuck in gaps, the outer magnetic coupler stops rotating along with the saw blade. Since there is no rigid mechanical connection between the inner and outer magnetic couplers, only the shearing force of the magnetic field exists. At this time, the inner magnetic coupler and the drive shaft can continue to idle or rotate at low speed even when the outer magnetic coupler is stopped. This avoids stall damage to the drive unit caused by a sudden increase in load, such as overcurrent, overheating, or burnout, thus improving the reliability, durability, and safety of the cutting device in unpredictable and complex underwater environments.

Description

Technical Field

[0001] This application belongs to the field of underwater device engineering application technology, specifically relating to a full-ocean-depth anti-blocking underwater cutting device. Background Technology

[0002] With the development of marine technology, the extensive excavation of the seabed has resulted in a large amount of cable and other debris. The entanglement of numerous cables hinders salvage progress, necessitating underwater cutting. However, existing underwater cutting equipment has reliability issues; the saw blade is prone to jamming underwater, easily causing motor stalling, leading to overload and burnout of the cutting device, and compromising equipment lifespan and operational safety. Summary of the Invention

[0003] In view of this, an underwater cutting device for preventing stalling at full ocean depth is proposed according to an embodiment of this application, comprising: The drive unit includes a drive shaft; The internal magnetic coupler is connected to the drive shaft to drive the internal magnetic coupler to rotate. An external magnetic coupler is fitted outside the inner magnetic coupler, and the external magnetic coupler is coupled to the inner magnetic coupler so that the inner magnetic coupler can drive the external magnetic coupler to rotate. The saw blade is mounted on an external magnetic coupler, and the saw blade rotates synchronously with the external magnetic coupler.

[0004] In one feasible implementation, the full-ocean-depth anti-blocking underwater cutting device further includes: Tighten the nut; the tightening nut is threadedly connected to the external magnetic coupler, and the tightening nut fixes the saw blade onto the external magnetic coupler.

[0005] In one feasible implementation, the external magnetic coupler includes a limiting part, and the saw blade is fitted on the outside of the limiting part; The side wall of the limiting part is provided with external threads. The clamping nut is fitted on the outside of the limiting part and is threadedly connected to the limiting part to press the saw blade onto the external magnetic coupler.

[0006] In one feasible implementation, the drive device further includes: Electric motor; The outer casing is placed over the motor. The tail cover is located at the end of the housing away from the drive shaft, and the tail cover is sealed to the housing.

[0007] In one feasible implementation, the external magnetic coupling further includes: A sealing cover is placed on the outside of the inner magnetic coupler, and the sealing cover is sealed to the outer shell. The main body is fitted onto the outside of the sealing cover, and the main body and the sealing cover are rotatably connected.

[0008] In one feasible implementation, the full-ocean-depth anti-blocking underwater cutting device further includes: The first bearing is located at one end of the body near the drive device. The first bearing is embedded in the inner wall of the body and fits against the sealing cover. The second bearing is located at one end of the main body away from the drive device. The second bearing is embedded in the inner wall of the main body and fits against the sealing cover.

[0009] In one feasible implementation, the outer casing, tail cover, and sealing cover form an oil cavity around the motor, which is filled with transformer oil, and the motor's oil circuit is connected to the oil cavity.

[0010] In one feasible implementation, the full-ocean-depth anti-blocking underwater cutting device further includes: The compensating oil bladder is filled with transformer oil and is located on the tail cover. The compensating oil bladder is connected to the oil cavity.

[0011] In one feasible implementation, the full-ocean-depth anti-blocking underwater cutting device further includes: The oil filler port is located on the tail cap. A watertight connector is embedded in the oil inlet, and the watertight connector is sealed to the oil inlet.

[0012] In one feasible implementation, the full-ocean-depth anti-blocking underwater cutting device further includes: The first connecting shaft is coaxially arranged with the drive shaft; The coupling has a first end connected to the drive shaft and a second end connected to the first connecting shaft. The first gear is fitted onto the outside of the first connecting shaft, and the first gear rotates synchronously with the first connecting shaft; A bracket is mounted on a first connecting shaft and is rotatably connected to the first connecting shaft. The second connecting shaft is set perpendicular to the first connecting shaft. The first end of the second connecting shaft is rotatably connected to the bracket, and the second end of the second connecting shaft is connected to the internal magnetic coupler. The second gear is fitted on the outside of the second connecting shaft. The second gear meshes with the first gear, and the first gear drives the second connecting shaft to rotate through the second gear.

[0013] The underwater cutting device for preventing stalling at full ocean depth disclosed in this application has the following advantages compared with the prior art: The underwater cutting device for full ocean depth anti-stalling provided in this application includes a drive unit, an inner magnetic coupler, an outer magnetic coupler, and a saw blade. The inner magnetic coupler is rigidly connected to the drive shaft. The inner and outer magnetic couplers transmit torque non-contactly through the magnetic field generated by the magnet, thereby enabling the saw blade and the outer magnetic coupler to rotate synchronously for cutting. When the saw blade suddenly stops (stalling) during underwater operation due to unexpected situations such as cutting foreign objects or getting stuck in gaps, the outer magnetic coupler stops rotating along with the saw blade. Since there is no rigid mechanical connection between the inner and outer magnetic couplers, only the shearing force of the magnetic field exists. At this time, the inner magnetic coupler and the drive shaft can still continue to idle or rotate at low speed while the outer magnetic coupler is stopped. This avoids stall damage such as overcurrent, overheating, and burnout caused by a sudden increase in load on the drive unit, and improves the reliability, durability, and safety of the cutting device in unpredictable complex underwater environments. Attached Figure Description

[0014] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A schematic structural diagram of the first angle of a full-ocean-depth anti-blocking underwater cutting device according to an embodiment of this application; Figure 2 A schematic structural diagram of a full-ocean-depth anti-blocking underwater cutting device according to an embodiment of this application, taken from a second angle; Figure 3 A schematic structural diagram of the third angle of a full-ocean-depth anti-blocking underwater cutting device according to an embodiment of this application; in, Figures 1 to 3 The correspondence between the reference numerals and component names in the attached drawings is as follows: 12. Drive unit; 14. Internal magnetic coupler; 16. External magnetic coupler; 18. Saw blade; 20. Compression nut; 22. Oil chamber; 24. Compensating oil bladder; 26. Watertight connector; 28. First connecting shaft; 30. Coupling; 32. First gear; 34. Bracket; 36. Second connecting shaft; 38. Second gear; 40. First bearing; 42. Second bearing; 161. Limiting part; 162. Sealing cover; 163. Body; 121. Drive shaft; 122. Motor; 123. Housing; 124. Tail cover. Detailed Implementation

[0015] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0016] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0017] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0018] The preferred embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0019] like Figures 1 to 3 As shown in the embodiment of this application, a full-ocean-depth anti-blocking underwater cutting device is proposed, comprising: a drive device 12, an inner magnetic coupler 14, an outer magnetic coupler 16, and a saw blade 18; the drive device 12 includes a drive shaft 121; the inner magnetic coupler 14 is connected to the drive shaft 121 for transmission, so as to drive the inner magnetic coupler 14 to rotate through the drive shaft 121; the outer magnetic coupler 16 is fitted outside the inner magnetic coupler 14, and the outer magnetic coupler 16 is coupled to the inner magnetic coupler 14, so as to drive the outer magnetic coupler 16 to rotate through the inner magnetic coupler 14; the saw blade 18 is disposed on the outer magnetic coupler 16, and the saw blade 18 rotates synchronously with the outer magnetic coupler 16.

[0020] The underwater cutting device for full ocean depth anti-stagnation provided in this application includes a drive device 12, an inner magnetic coupler 14, an outer magnetic coupler 16, and a saw blade 18. The inner magnetic coupler 14 is rigidly connected to the drive shaft 121. The inner magnetic coupler 14 and the outer magnetic coupler 16 transmit torque non-contactly through the magnetic field generated by the magnet, thereby causing the saw blade 18 and the outer magnetic coupler 16 to rotate synchronously to perform cutting action. When the saw blade 18 suddenly stops (stagnates) during underwater operation due to unexpected situations such as cutting foreign objects or getting stuck in gaps, the outer magnetic coupler 16 stops rotating along with the saw blade 18. Since there is no mechanical rigid connection between the inner magnetic coupler 14 and the outer magnetic coupler 16, only the shearing force of the magnetic field exists. At this time, the inner magnetic coupler 14 and the drive shaft 121 can still continue to idle or rotate at low speed when the outer magnetic coupler 16 stops, thereby avoiding overcurrent, overheating, burnout and other stall damage to the drive device 12 caused by a sudden increase in load, and improving the reliability, durability and safety of the cutting device in unpredictable complex underwater environments.

[0021] like Figures 1 to 3 As shown, in one feasible embodiment, the full-ocean-depth anti-blocking underwater cutting device further includes: a clamping nut 20; the clamping nut 20 is threadedly connected to the external magnetic coupler 16, and the clamping nut 20 fixes the saw blade 18 on the external magnetic coupler 16.

[0022] In this technical solution, the axial preload generated by tightening the clamping nut 20 firmly presses the saw blade 18 onto the external magnetic coupler 16, ensuring that the saw blade 18 will not loosen under high speed and impact load. At the same time, the threaded connection allows for quick disassembly and replacement of the saw blade 18, enabling the cutting device to adapt to the cutting needs of different materials. Only the saw blade 18 of the corresponding specification needs to be replaced, which enhances the versatility and ease of maintenance of the cutting device.

[0023] like Figure 2 As shown, in one feasible embodiment, the external magnetic coupler 16 includes a limiting part 161, and the saw blade 18 is fitted on the outside of the limiting part 161; the side wall of the limiting part 161 is provided with an external thread, and the clamping nut 20 is fitted on the outside of the limiting part 161. The clamping nut 20 is threadedly connected to the limiting part 161 to press the saw blade 18 onto the external magnetic coupler 16.

[0024] In this technical solution, the limiting part 161 at the end of the external magnetic coupler 16 serves to radially position the saw blade 18. The limiting part 161 provides an axial mounting reference for the saw blade 18, preventing it from being excessively pressed in. Simultaneously, the saw blade 18 is fitted onto the limiting part 161, and the limiting part 161 radially positions the saw blade 18, improving the stability of the connection between the saw blade 18 and the external magnetic coupler 16, ensuring smooth cutting, and reducing vibration of the saw blade 18 during cutting. By using the external thread machined on the side wall of the limiting part 161 to engage with the internal thread of the clamping nut 20, the tightening force can be directly applied to the saw blade 18, simplifying the structural complexity of the interface between the external magnetic coupler 16 and the saw blade 18, and improving the assembly efficiency of the saw blade 18.

[0025] like Figure 1 As shown, in one feasible embodiment, the drive device 12 further includes: a motor 122, a housing 123 and a tail cover 124; the housing 123 covers the outside of the motor 122; the tail cover 124 is disposed at one end of the housing 123 away from the drive shaft 121, and the tail cover 124 is sealed to the housing 123.

[0026] In this technical solution, the outer casing 123 is wrapped around the outside of the motor 122, and the tail cover 124 is located at the end of the outer casing 123 away from the drive shaft 121, so as to seal the non-drive end of the motor 122 through the tail cover 124; the tail cover 124 and the outer casing 123 are separate structures, and the internal components of the motor 122 can be installed, debugged and maintained by disassembling the tail cover 124.

[0027] like Figures 1 to 3 As shown, in one feasible embodiment, the outer magnetic coupler 16 further includes: a sealing cover 162 and a body 163; the sealing cover 162 is disposed on the outside of the inner magnetic coupler 14, and the sealing cover 162 is sealed to the outer shell 123; the body 163 is fitted on the outside of the sealing cover 162, and the body 163 is rotatably connected to the sealing cover 162.

[0028] In this technical solution, the sealing cover 162 is used as a static component to cover the outside of the inner magnetic coupler 14. The sealing cover 162 is used to seal the drive end of the outer shell 123. By cooperating with the tail cover 124, the sealing cover 162 seals the motor 122, the inner magnetic coupler 14 and the transmission mechanism, so that the inner magnetic coupler 14 and the motor 122 are isolated from the external high-pressure seawater, forming a physical barrier to protect the inner magnetic coupler 14 and the motor 122, ensuring that the inner magnetic coupler 14 can rotate normally underwater without interference. As a dynamic rotating component, the main body 163 rotates relative to the sealing cover 162. By setting the sealing cover 162 between the main body 163 and the inner magnetic coupler 14, the rotational dynamic seal is transformed into a relatively simple static end cover seal. The seal between the sealing cover 162 and the outer shell 123 is a static seal, which has higher reliability. The rotation of the outer magnetic coupler 16 does not involve sealing issues, avoiding the leakage, wear and failure risks of traditional rotary shaft seals under deep-sea high pressure, ensuring that the magnetic coupling drive can be reliably applied in the deep sea, and ensuring the sealing performance of the cutting device under deep-sea pressure.

[0029] It should be noted that by sealing the outer shell 123 with the sealing cap 162 and the tail cap 124, the drive part of the cutting device is completely enclosed by the sealing structure, which makes it possible to implement pressure compensation technology inside the outer shell 123, thereby laying an effective mechanical layout foundation for the cutting device to achieve full ocean depth operation capability from shallow sea to 10,000-meter deep abyss.

[0030] like Figure 2 As shown, in one feasible embodiment, the full-ocean-depth anti-blocking underwater cutting device further includes: a first bearing 40 and a second bearing 42; the first bearing 40 is disposed at one end of the body 163 near the drive device 12, the first bearing 40 is embedded in the inner wall of the body 163, and the first bearing 40 is in contact with the sealing cover 162; the second bearing 42 is disposed at one end of the body 163 away from the drive device 12, the second bearing 42 is embedded in the inner wall of the body 163, and the second bearing 42 is in contact with the sealing cover 162.

[0031] In this technical solution, the body 163 adopts a double bearing structure to ensure that the body 163 can perform high rigidity and high precision rotational movement; the first bearing 40 and the second bearing 42 are respectively set at both ends of the body 163 to form a double support structure, which ensures the flexibility of the body 163 in rotation relative to the sealing cover 162, while resisting the radial and axial combined loads generated by the saw blade 18 during cutting, preventing the body 163 from swaying or vibrating, and ensuring that the saw blade 18 can cut smoothly.

[0032] It should be noted that the sealing cover 162 extends away from the drive shaft 121 so that the body 163 can be fitted onto the sealing cover 162, thereby improving the stability of the installation of the body 163 and the sealing cover 162; the second bearing 42 is fitted with the outwardly extending end of the sealing cover 162, and then the first bearing 40 and the second bearing 42 cooperate to provide effective rotational support for the body 163.

[0033] like Figure 1 As shown, in one feasible embodiment, the outer casing 123, the tail cover 124 and the sealing cover 162 surround the motor 122 to form an oil cavity 22, which is filled with transformer oil, and the oil passage of the motor 122 is connected to the oil cavity 22.

[0034] In this technical solution, the motor 122 is immersed in transformer oil within the oil chamber 22. When the cutting device operates underwater, the deep-sea water pressure acts on the entire outer surface of the cutting device. By filling the oil chamber 22 with transformer oil, air gaps within the oil chamber 22 are avoided, thus preventing the water pressure from deforming the outer casing 123 and squeezing its internal components. This maintains a static balance between the internal and external pressures of the motor 122, reducing the pressure difference and preventing deformation or seal failure of the outer casing 123 due to a large pressure difference, thereby protecting the structure of the motor 122. Simultaneously, the motor 122 generates a large amount of heat during operation. By immersing the motor 122 in the transformer oil, the transformer oil rapidly carries away the heat from the motor 122, transferring it to the outer casing 123, where it is then cooled by the external seawater, forming an effective heat dissipation channel and preventing the cutting device from overheating. In addition, in the high-pressure and high-humidity environment of the deep sea, any tiny air gap may cause discharge or breakdown. Transformer oil is an insulating medium. The motor 122 is immersed in the transformer oil and the oil circuit of the motor 122 is connected to the oil chamber 22. The transformer oil can provide reliable insulation protection for the winding of the motor 122, while isolating oxygen and moisture, preventing corrosion of internal metal parts, ensuring the safety of the cutting device when used underwater, and extending the service life of the cutting device.

[0035] like Figure 1 and Figure 3 As shown, in one feasible embodiment, the full-ocean-depth anti-blocking underwater cutting device further includes: a compensation oil bladder 24; the compensation oil bladder 24 is filled with transformer oil, the compensation oil bladder 24 is disposed on the tail cap 124, and the compensation oil bladder 24 is connected to the oil cavity 22.

[0036] In this technical solution, based on the static oil filling of the oil chamber 22, a dynamic pressure compensation mechanism of the compensation oil bladder 24 is introduced to further enhance the all-ocean-depth adaptability of the cutting device. The flexible compensation oil bladder 24, as a variable-volume oil storage container, automatically replenishes transformer oil to the oil chamber 22 or receives transformer oil squeezed out of the oil chamber 22 during the diving or surfacing process of the cutting device, i.e., when the external environmental pressure changes. This maintains a dynamic balance between the internal pressure of the cutting device and the external environmental pressure in real time. On the one hand, it compensates for the thermal expansion and contraction of the transformer oil volume caused by temperature changes; on the other hand, it ensures that the pressure balance inside the cutting device remains unrestricted when the sea depth changes rapidly, avoiding instantaneous negative or positive pressure impacts inside the outer shell 123. Through the cooperation of the compensation oil bladder 24 and the rigid oil chamber 22, a dual pressure guarantee system of main volume balance and flexible compensation is formed, eliminating the influence of changes in the working sea depth on the cutting device and enabling it to adapt to different sea depths and operate stably in operations with frequent changes in depth.

[0037] like Figure 1 and Figure 3 As shown, in one feasible embodiment, the full-ocean-depth anti-blocking underwater cutting device further includes: an oil inlet and a watertight connector 26; the oil inlet is disposed on the tail cap 124; the watertight connector 26 is embedded in the oil inlet and the watertight connector 26 is sealed to the oil inlet.

[0038] In this technical solution, by setting an oil inlet on the tail cap 124, it is possible to conveniently fill and vent the oil chamber 22 during the assembly or maintenance of the cutting device, ensuring that the oil chamber 22 is filled with transformer oil without air gaps, thereby ensuring uniform pressure transmission within the oil chamber 22; by using a watertight connector 26 to avoid the oil inlet, the oil chamber 22 is sealed after oil filling and venting are completed, ensuring that the cutting device can withstand extreme deep-sea pressure, preventing seawater from seeping into the oil chamber 22, and ensuring the safe and stable operation of the cutting device in the deep-sea environment.

[0039] like Figure 1 and Figure 2As shown, in one feasible embodiment, the full-ocean-depth anti-blocking underwater cutting device further includes: a first connecting shaft 28, a coupling 30, a first gear 32, a bracket 34, a second connecting shaft 36, and a second gear 38; the first connecting shaft 28 is coaxially arranged with the drive shaft 121; the first end of the coupling 30 is connected to the drive shaft 121, and the second end of the coupling 30 is connected to the first connecting shaft 28; the first gear 32 is fitted on the outside of the first connecting shaft 28, and the first gear 32 rotates synchronously with the first connecting shaft 28; the bracket 34 is arranged on the first connecting shaft 28, and the bracket 34 is rotatably connected to the first connecting shaft 28; the second connecting shaft 36 is arranged perpendicular to the first connecting shaft 28, the first end of the second connecting shaft 36 is rotatably connected to the bracket 34, and the second end of the second connecting shaft 36 is connected to the inner magnetic coupler 14; the second gear 38 is fitted on the outside of the second connecting shaft 36, and the second gear 38 meshes with the first gear 32, and the first gear 32 drives the second connecting shaft 36 to rotate through the second gear 38.

[0040] In this technical solution, the drive shaft 121 drives the coupling 30 to rotate, which in turn drives the first connecting shaft 28 and the first gear 32 to rotate. Through the meshing of the second gear 38 with the first gear 32, the first gear 32 drives the second gear 38 and the second connecting shaft 36 to rotate, thereby driving the inner magnetic coupler 14 on the second connecting shaft 36 to rotate. The bracket 34 provides rotational support for the second connecting shaft 36 to ensure the smooth rotation of the inner magnetic coupler 14. By arranging the second connecting shaft 36 perpendicular to the drive shaft 121, the axial direction of the motor 122 is offset from the main force direction of the cutting device, achieving a 90-degree reversal of the power flow direction of the cutting device. This makes the axial direction of the motor 122 perpendicular to the rotation axis of the saw blade 18, thereby reducing the radial load on the drive shaft 121 and reducing the tendency of the drive shaft 121 to deform. At the same time, it shortens the overall length of the cutting device, enhancing the operational flexibility and deployment convenience of the cutting device when clamped, stored, or passing through narrow spaces underwater.

[0041] It will be readily understood by those skilled in the art that the above embodiments can be freely combined and superimposed without conflict.

[0042] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A full-ocean-depth anti-blocking underwater cutting device, characterized in that, The full-ocean-depth anti-blockage underwater cutting device includes: The drive device includes a drive shaft; An internal magnetic coupler is connected to the drive shaft for driving the internal magnetic coupler to rotate via the drive shaft. An external magnetic coupler is fitted outside the inner magnetic coupler and coupled to the inner magnetic coupler so as to drive the rotation of the external magnetic coupler through the inner magnetic coupler; A saw blade is mounted on the external magnetic coupler, and the saw blade rotates synchronously with the external magnetic coupler.

2. The underwater cutting device for preventing jamming and turning at full ocean depth according to claim 1, characterized in that, The full-ocean-depth anti-blocking underwater cutting device also includes: A clamping nut is threadedly connected to the external magnetic coupler, and the clamping nut fixes the saw blade onto the external magnetic coupler.

3. The underwater cutting device for preventing jamming and turning at full ocean depth according to claim 2, characterized in that, The external magnetic coupler includes a limiting part, and the saw blade is fitted on the outside of the limiting part; The side wall of the limiting part is provided with an external thread, and the clamping nut is fitted on the outside of the limiting part. The clamping nut is threadedly connected to the limiting part to press the saw blade onto the external magnetic coupler.

4. The underwater cutting device for preventing jamming and turning at full ocean depth according to claim 1, characterized in that, The drive device further includes: Electric motor; A housing, which covers the exterior of the motor; A tail cover is disposed at one end of the housing opposite to the drive shaft, and the tail cover is sealed to the housing.

5. The underwater cutting device for preventing jamming and turning at full ocean depth according to claim 4, characterized in that, The external magnetic coupling also includes: A sealing cover is provided on the outside of the inner magnetic coupler, and the sealing cover is sealed to the outer shell; The main body is fitted onto the outside of the sealing cover, and the main body is rotatably connected to the sealing cover.

6. The underwater cutting device for preventing jamming and turning at full ocean depth according to claim 5, characterized in that, The full-ocean-depth anti-blocking underwater cutting device also includes: A first bearing is disposed at one end of the body near the drive device, the first bearing is embedded in the inner wall of the body, and the first bearing is in contact with the sealing cover; The second bearing is disposed at one end of the body away from the drive device, the second bearing is embedded in the inner wall of the body, and the second bearing is in contact with the sealing cover.

7. The underwater cutting device for preventing jamming and turning at full ocean depth according to claim 5, characterized in that, The outer casing, the tail cap, and the sealing cap form an oil cavity around the motor. The oil cavity is filled with transformer oil, and the motor's oil circuit is connected to the oil cavity.

8. The underwater cutting device for preventing jamming and turning at full ocean depth according to claim 7, characterized in that, The full-ocean-depth anti-blocking underwater cutting device also includes: A compensating oil bladder, which is filled with transformer oil, is mounted on the tail cover and is connected to the oil cavity.

9. The underwater cutting device for preventing jamming and turning at full ocean depth according to claim 7, characterized in that, The full-ocean-depth anti-blocking underwater cutting device also includes: The oil inlet is located on the tail cap; A watertight connector is embedded in the oil inlet and is sealed to the oil inlet.

10. A full-ocean-depth anti-blocking underwater cutting device according to any one of claims 1 to 9, characterized in that, The full-ocean-depth anti-blocking underwater cutting device also includes: A first connecting shaft is coaxially arranged with the drive shaft; A coupling, wherein a first end of the coupling is connected to the drive shaft, and a second end of the coupling is connected to the first connecting shaft; The first gear is mounted on the outside of the first connecting shaft, and the first gear rotates synchronously with the first connecting shaft; A bracket is mounted on the first connecting shaft and is rotatably connected to the first connecting shaft; A second connecting shaft is provided perpendicular to the first connecting shaft. The first end of the second connecting shaft is rotatably connected to the bracket, and the second end of the second connecting shaft is connected to the internal magnetic coupler. The second gear is mounted on the outside of the second connecting shaft and meshes with the first gear. The first gear drives the second connecting shaft to rotate through the second gear.

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