Underwater explosion efficient shaped charge cutting device based on combined charging

Abstract

The utility model provides an underwater explosion efficient shaped charge cutting device based on combined charge, which comprises an underwater annular shaped charge structure and a positioning device, the positioning device is connected with a semi-annular shaped charge structure through a connecting device, and the outer side of the semi-annular shaped charge structure is connected with a detonator; the two positioning devices are arranged on the outer side of the cutting position of the target tubular structure, and the two positioning devices are fixed to each other; the two semi-annular shaped charge structures are arranged on the outer side of the cutting position of the target tubular structure, the two semi-annular shaped charge structures are fixed to each other, and each semi-annular shaped charge structure comprises a plurality of equally-divided cutting units. The cutting end face formed by the underwater explosion cutting device has high fairness, the refinement level of underwater explosion cutting is improved, the underwater explosion cutting device is suitable for cutting tubular structures in any direction and with any structural parameters on the seabed, deep water cutting operation can be achieved, and the underwater explosion cutting device can also be used for cutting structures with rigid body displacement after underwater explosion of flexible bodies such as steel cables, optical cables and electric cables.

Description

Technical Field

[0001] The utility model relates to the technical field of underwater blasting, and particularly relates to an underwater explosion high-efficiency shaped charge cutting device based on a combined charge. Background Art

[0002] The linear shaped charge structure has the advantages of concentrated energy, high cutting precision, controllable cutting direction, etc., and is widely used in engineering to cut metal and concrete structures. The existing linear shaped charges are generally of a uniform stretching structure, and the formed penetrator is in the shape of a blade, which can cause efficient damage to structures with a flat surface. However, for structures with curvature such as pipelines, optical cables, and cables in ocean engineering or special-shaped structures, the cutting effect of the existing stretching type linear shaped charge structure is not ideal. On the one hand, there is a time difference in the cutting action of the penetrator on different positions of the target structure, resulting in irregular cutting breaks, and the cutting effect is worse at positions farther away from the charge structure. On the other hand, the water medium will significantly reduce the forming effect and penetration ability of the charge structure. When exploding underwater, problems such as head bluntness and deflection of the penetrator will occur, which is not conducive to achieving precise cutting of tubular structures. When traditional cutting devices cut flexible underwater structures such as optical cables and cables, the structure will have rigid body displacement, affecting the cutting effect and making it difficult to achieve cutting.

[0003] In view of the above problems, the following solutions have been proposed.

[0004] Regarding the problem of uneven cutting effect of the penetrator on the tubular structure, one is to connect several uniformly stretched linear shaped charge structures in series to form a cutting ring, and the other is to make two semi-circular charge structures that are fastened to the surface of the tubular target. The first method cannot guarantee the continuity and uniformity of the penetrator at the connection, and there is redundant space between the cutting device and the target surface. When exploding underwater, the water medium in the space reduces the forming effect and damage ability of the penetrator. The second method can form a uniform and continuous radial penetrator, but the aspect ratio of the charge structure is too large, the uniformity inside the explosive is poor during pressing, and it is not conducive to initiation.

[0005] Aiming at the problem that the water medium reduces the forming effect and penetration ability of the penetrator during underwater explosion, one method is to arrange an inflatable structure between the target structure and the cutting device, and the other is to place a shaped charge structure in a sealed cavity, with the remaining part of the cavity being air. In the first method, the surface of the inflatable structure is tangent to the surface of the liner, but there are still redundant parts at irregular structural positions such as the liner cone angle. Moreover, the initial medium condition of the penetrator has a significant impact on the overall forming effect. This method of separating the air medium from the charge structure still has an adverse effect on the forming of the penetrator. In addition, the outer shell of the inflatable structure is generally made of elastic material, which reduces the overall stability of the cutting device and is not conducive to deep-water operations. In the second method, the initial medium condition of the penetrator is better, but the cavity size is greatly restricted by the outer shell, making it difficult to meet the needs of the penetrator forming. The position where the liner is connected to the outer shell belongs to the stress concentration area. There is a contradiction between the structural strength of this cutting device at greater depths and the remaining damage ability of the penetrator after cutting the outer shell of the charge structure. Moreover, it is not easy to press the charge and process the structure when cutting a tubular structure. Summary of the Utility Model

[0006] In view of the above-mentioned technical problem that the cutting effect of the existing penetrator cutting device is not good, a high-efficiency shaped charge cutting device for underwater explosion based on a combined charge is provided. The separate design of the positioning device and the shaped charge structure of the present utility model can ensure uniform distribution of the initial load of the cutting device and improve the structural stability, making the cutting device applicable to the cutting of tubular structures with arbitrary directions and structural parameters.

[0007] The technical means adopted by the present utility model are as follows:

[0008] A high-efficiency shaped charge cutting device for underwater explosion based on a combined charge, comprising two semi-circular shaped charge structures arranged underwater and two positioning devices. The positioning devices are connected to the semi-circular shaped charge structures through connecting devices, and detonators are connected to the outer sides of the semi-circular shaped charge structures;

[0009] The target tubular structure is arranged underwater; the structural centers of gravity of the two semi-circular shaped charge structures are in the cutting plane of the target tubular structure;

[0010] Taking the direction close to the target tubular structure as the inner side and the direction far from the target tubular structure as the outer side, the two positioning devices are arranged on the outer sides of the cutting positions of the target tubular structure, and the two positioning devices are fixed to each other;

[0011] The two semi-circular shaped charge structures are arranged on the outer sides of the cutting positions of the target tubular structure, and the two semi-circular shaped charge structures are fixed to each other. Each semi-circular shaped charge structure includes a number of equally divided cutting units.

[0012] Furthermore, the positioning device includes a semi-circular pipe clamp. A number of first lifting rings are arranged on the outer wall of the pipe clamp. One end of the first lifting ring is connected to the connecting device. One fixing plate is connected to each end of the pipe clamp. A positioning through hole is formed in the fixing plate. The fixing stud passes through the positioning through holes on the same side of the two positioning devices to fix the two positioning devices.

[0013] Furthermore, a rubber pad is arranged on the inner side of the pipe clamp.

[0014] Furthermore, one end of the two semi-circular shaped charge structures is connected through a hinge structure, and the other end of the two semi-circular shaped charge structures is connected through a fixing block and a magnetic rubber plate.

[0015] Furthermore, the cutting unit includes a housing. The outer side inside the housing is a charge structure, and the inner side inside the housing is a cavity. A second lifting ring is arranged on the housing near the positioning device side. One end of the second lifting ring is connected to the connecting device;

[0016] The charge structure includes an inner housing and a liner. The inner side of the inner housing is connected to the liner. The space formed by the inner housing and the liner is filled with explosive. Detonator holes are respectively formed in the inner housing and the outer housing at opposite positions. The detonator holes are connected to detonators.

[0017] Furthermore, a T-shaped structure is arranged on the outer surface of the inner housing, and a T-shaped groove is arranged on the inner surface of the outer housing. The inner housing and the outer housing are connected through the T-shaped structure and the T-shaped groove.

[0018] Furthermore, the liner is a spherical segment-shaped liner.

[0019] Furthermore, an axial strengthening member and a circumferential strengthening member are arranged on the inner side of the cavity.

[0020] Furthermore, in the cutting unit, the wall thickness satisfies t0≤t, where t is the thickness of the liner; the wall thicknesses of each structure in the axial direction satisfy t1 = t2 + t3, where t1 is the thickness of the outer housing on the cavity side, t2 is the thickness of the inner housing on the charge structure side, and t3 is the thickness of the outer housing on the charge structure side, and at the same time, t3≤t2.

[0021] Furthermore, in the cutting unit, S≤2L, where S is the length of the cavity and L is the height of the charge.

[0022] Compared with the prior art, the present utility model has the following advantages:

[0023] The utility model provides an underwater explosion high-efficiency shaped charge cutting device based on combined charge. The segmented assembly method of the cutting unit improves the uniformity of the pressed charge mass distribution and the processing efficiency; the cooperation between the inner shell and the outer shell ensures the stable position of the cutting unit; the hinged structure and the fixed block ensure that the two semi-circular shaped charge structures can be completely fitted, thereby ensuring the fixation of the cutting position and the cutting direction of the penetrator; the circular-shaped charge liner can form a radially uniform and continuous linear explosively formed penetrator to achieve uniform cutting of the tubular structure; the cavity inside the outer shell provides the standoff distance and medium conditions for the shaped charge structure, improving the forming effect and penetration ability of the penetrator in underwater explosion; the axial and circumferential strengthening members inside the outer shell improve the overall strength and stability of the cutting device, enabling the cutting device to be applicable to operations in deep water environments; due to the existence of the strengthening members, the thickness of the outer shell on the side close to the surface of the target structure can be reduced, improving the remaining penetration ability of the penetrator after piercing the housing of the device; each cutting unit is provided with a detonator hole, which can achieve multi-point detonation and precise control of the detonation method;

[0024] In the traditional cutting device, the positioning device is not separated from the shaped charge structure, resulting in the center of gravity of the structure not being in the cutting plane, causing the detonator and the charge to be not perpendicular at the initial position and also making the cutting plane not perpendicular to the structure, thus reducing the cutting effect. The separated design of the positioning device and the shaped charge structure in the utility model can ensure the uniform distribution of the initial load of the cutting device and improve the structural stability, enabling the cutting device to be applicable to the cutting of tubular structures with arbitrary directions and structural parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 It is the front view of the cutting device of the present utility model.

[0027] Figure 2 It is the schematic diagram of the positioning device of the present utility model.

[0028] Figure 3 It is the schematic diagram of the hinge of the two semi-circular shaped charge structures.

[0029] Figure 4 It is the schematic diagram of the structure of a single semi-circular shaped charge structure.

[0030] Figure 5 It is the schematic diagram of the inner shell.

[0031] Figure 6 It is a schematic cross-sectional view of a single shaped charge structure.

[0032] Figure 7 It is a schematic view of the connection part of two semi-circular shaped charge structures.

[0033] In the figure: 1. Fixed stud; 2. Positioning device; 21. First lifting ring; 22. Pipe clamp; 23. Positioning through hole; 24. Rubber pad; 3. Connecting device; 4. Semi-circular shaped charge structure; 41. Cutting unit; 411. Explosive; 412. Detonator hole; 413. Outer shell; 414. Cavity; 415. Axial strengthening member; 416. Circumferential strengthening member; 417. Liner; 418. Inner shell; 419. T-shaped structure; 42. Fixed block; 43. Magnetic rubber plate; 44. Second lifting ring; 45. Hinge structure; 5. Detonator. Specific implementation manners

[0034] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments may be combined with each other. The present utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0035] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part rather than all of the embodiments of the present utility model. The description of at least one exemplary embodiment below is actually only illustrative and in no way restricts the present utility model and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0036] It should be noted that the terms used herein are only for describing specific implementation manners and are not intended to limit the exemplary embodiments according to the present utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations.

[0037] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present utility model. At the same time, it should be clear that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific values should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0038] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom", etc. are generally based on the orientation or positional relationships shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description. Without contrary statements, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as limiting the protection scope of the present utility model: the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0039] For ease of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above-mentioned", etc. can be used here to describe the spatial positional relationships of one device or feature to other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the drawings for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned as "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0040] In addition, it should be noted that the use of words such as "first", "second", etc. to define components is only for the convenience of differentiating the corresponding components. Without additional statements, the above words have no special meanings. Therefore, it should not be construed as limiting the protection scope of the present utility model.

[0041] Such asFigures 1-7 As shown in the figure, the utility model provides an underwater explosion high-efficiency energy-gathering cutting device based on combined charge, which includes two semi-circular energy-gathering charge structures 4 arranged underwater and two positioning devices 2. The positioning device 2 is connected to the semi-circular energy-gathering charge structure 4 through a connecting device 3, and a detonator 5 is connected to the outer side of the semi-circular energy-gathering charge structure 4;

[0042] If the gravity of the overall structure is greater than the buoyancy, and the connecting device 3 between the positioning device 2 and the semi-circular energy-gathering charge structure 4 is connected by a chain structure, the positioning device 2 is placed above the semi-circular energy-gathering charge structure 4; if the connecting device 3 is a strut structure, the positional relationship between the positioning device 2 and the semi-circular energy-gathering charge structure 4 can be either up or down;

[0043] If the buoyancy of the overall structure is greater than the gravity, and the connecting device 3 between the positioning device 2 and the semi-circular energy-gathering charge structure 4 is connected by a chain structure, the positioning device 2 is placed below the semi-circular energy-gathering charge structure 4; if the connecting device 3 is a strut structure, the positional relationship between the positioning device 2 and the semi-circular energy-gathering charge structure 4 can be either up or down;

[0044] The target tubular structure is arranged underwater;

[0045] Taking the direction close to the target tubular structure as the inner side and the direction away from the target tubular structure as the outer side, two positioning devices 2 are arranged on the outer side of the cutting position of the target tubular structure, and the two positioning devices 2 are fixed to each other; the positioning device 2 includes a semi-circular pipe clamp 22, and several first lifting rings 21 are arranged on the outer wall of the pipe clamp 22. The first lifting ring 21 is connected to one end of the connecting device 3. Both ends of the pipe clamp 22 are respectively connected with a fixing plate, and a positioning through hole 23 is opened on the fixing plate. The fixing stud 1 passes through the positioning through holes 23 on the same side of the two positioning devices 2 to fix the two positioning devices 2. A rubber pad 24 is arranged on the inner side of the pipe clamp 22.

[0046] Two semi-circular energy-gathering charge structures 4 are arranged on the outer side of the cutting position of the target tubular structure, and the two semi-circular energy-gathering charge structures 4 are fixed to each other. Each semi-circular energy-gathering charge structure 4 includes several equally divided cutting units 41. One end of the two semi-circular energy-gathering charge structures 4 is connected through a hinge structure 45, and the other end of the two semi-circular energy-gathering charge structures 4 is connected through a fixing block 42 and a magnetic rubber plate 43.

[0047] The cutting unit 41 includes a housing 413. The outer side inside the housing 413 is a charge structure. The inner side inside the housing 413 is a cavity 414. A second lifting ring 44 is provided on the housing of the housing 413 close to the positioning device 2, and the second lifting ring 44 is connected to one end of the connecting device 3; the charge structure includes an inner housing 418 and a liner 417. The inner side of the inner housing 418 is connected to the liner. The space formed by the inner housing 418 and the liner is filled with explosive 411. Detonator holes 412 are respectively provided at opposite positions of the inner housing 418 and the housing 413, and the detonator holes 412 are connected to the detonator 5. A T-shaped structure 419 is provided on the outer surface of the inner housing 418, and a T-shaped groove is provided on the inner surface of the housing 413. The inner housing 418 and the housing 413 are connected through the T-shaped structure 419 and the T-shaped groove.

[0048] Axial strengthening members 415 and circumferential strengthening members 416 are provided inside the cavity. The axial strengthening members 415 are a plurality of rib plates arranged axially, and the circumferential strengthening members 416 are reinforcing ribs. The circumferential strengthening members 416 pass through the axial strengthening members 415. Through such an arrangement, the compressive capacity will be significantly improved, and the cavity 414 will not be flattened under the action of water pressure, which not only improves the explosive detonation effect but also improves the forming effect of the jet, and overall improves the underwater operation ability.

[0049] The first lifting ring 21 and the obliquely arranged second lifting ring 44 are connected through the obliquely arranged connecting device 3. Compared with the cable structure arranged vertically up and down, the obliquely arranged cable can provide a radially inward force and can improve the overall stability of the structure.

[0050] As Figure 1 shown, when the utility model is in use, first, the position of the positioning device 2 is determined according to the target cutting position, and the connecting device 3 is selected according to the working conditions. Then, the two semi-circular shaped charge structures 4 are closely attached to the surface of the target structure. One end of the two semi-circular shaped charge structures 4 is connected and fitted through the hinge structure 45, and the other end is fixed through the fixing block 42 and the magnetic rubber plate 43. Then, through the connecting device 2 ( Figure 1 a roller chain is selected), the second lifting rings 44 on the two semi-circular shaped charge structures 4 are respectively connected to the first lifting rings 21 at the symmetric positions of the positioning device 2. Finally, detonators 5 are inserted into the respective detonator holes 412 for multi-point detonation to achieve efficient cutting.

[0051] The positioning device 2 as Figure 2As shown, an independent design method from the shaped charge structure is adopted. On the one hand, it improves the smoothness of the overall shell of the shaped charge structure, making the tensile and compressive load distributions uniform. On the other hand, this positioning method is applicable to target structures with variable diameters, and the inner diameter of the positioning device 2 can be adjusted to adapt to different working conditions; a rubber pad 24 is arranged inside the pipe clamp 22 to increase the friction force with the surface of the target structure; the positioning devices 2 are connected by high-strength fixing studs 1 passing through the positioning through holes 23, and then the fastening nuts are screwed in. This positioning device 2 can effectively limit the circumferential and axial movements of the shaped charge structure, enabling the cutting device to be applied to cut tubular structures in any direction.

[0052] The semi-circular shaped charge structure 4 is as Figures 3 to 7 shown. One end of the two semi-circular shaped charge structures 4 is connected by a hinged structure 45, which can be carried out underwater or before launching. The other end is fixed by a fixing block 42 and bolts after the shaped charge structure is arranged on the target structure ( Figure 7 shown); the semi-circular shaped charge structure 4 is mainly composed of several cutting units 41 and a grooved outer shell 413. The assembly of the cutting unit 41 is realized through the cooperation of the inner shell T-shaped structure 419 and the groove of the outer shell.

[0053] The cutting unit 41 is as Figure 5 shown. A spherical segment-shaped liner is adopted, which can generate a uniform and continuous circular ring-shaped linear shaped charge penetrator. The materials of the explosive 411 and the liner 417 are determined according to the actual needs of the working conditions. The explosive 411 can be selected as B explosive or HMX with good thermal stability and detonation effect, etc. The material of the liner 417 can be selected as copper, tungsten or lead alloy, etc. The shells are all made of steel materials; the combined charging method does not limit the number of cutting units, Figure 4 which shows the situation of assembling 3 60° cutting units 41 in the semi-circular linear shaped charge structure 4. It can be adjusted according to the actual processing conditions. This combined charging method can improve production efficiency and can reduce the single pressing volume of the explosive, making the internal mass distribution of the explosive uniform; in addition, a detonator hole 412 is reserved at the top of each cutting unit 41. For the explosive, a protruding structure can be arranged inside the pressing die, so that the detonator hole is directly prefabricated when the explosive 411 is pressed; while the inner shell 418 and the outer shell 413 can directly cut round holes at the corresponding positions. Therefore, this combined charging method can achieve precise control of the initiation method.

[0054] The grooved outer shell 413 is as Figure 4 shown. On the side of the inner part of the outer shell 413 close to the target structure ( Figure 6On the right side), cavities are formed, providing the stand-off distance condition and medium condition for the formation and penetration of the penetrator; axial and circumferential strengthening members are arranged, enhancing the structural strength of the shaped charge and making it applicable to operations in deeper waters. At the same time, the size, position, and quantity of the strengthening members can be adjusted to adjust the overall center of gravity position of the cutting device. And since the width of the penetrator formed by the shaped charge structure is smaller than the width of the charge, these strengthening members will not interfere with the formation and damage of the penetrator; the thickness of the outer shell 413 is slightly larger on the upper and lower sides of the cavity section than that of the assembly section, ensuring that the thickness of the whole cutting device is consistent on the upper and lower sides after assembling the cutting unit 41. The thickness of the outer shell 413 near the wall of the structure is smaller to prevent the cutting device itself from reducing the damage effect of the shaped charge structure on the target. The existence of the metal shell can enhance the shaped charge effect and improve the cutting ability of the cutting device.

[0055] In addition, the cutting device of the present utility model can cut a tubular structure with a diameter smaller than that of the cutting device. The fixing device in the present utility model can fix the cutting device on the outer side of the tubular structure. However, in order to ensure that the cutting device and the pipe diameter are in a concentric geometric relationship as much as possible to ensure the cutting effect, straps can be used on the outer side of the cutting device, or a spring rod with an adjustable length can be used on the inner side of the cutting device, thereby adjusting the radial relative position relationship between the cutting device and the tubular structure.

[0056] In summary, the present utility model proposes an underwater explosion high-efficiency shaped charge cutting device based on a combined charge, which is applicable to the high-efficiency damage and precise cutting of tubular structures with arbitrary directions and structural parameters on the seabed and can achieve deep-water operations.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and are not intended to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present utility model.

Claims

1. An underwater explosion high-efficiency energy-gathering cutting device based on combined charge, characterized in that: The invention comprises two semi-annular shaped charge structures (4) and two positioning devices (2) arranged underwater, wherein the positioning devices (2) are connected to the semi-annular shaped charge structures (4) via connecting devices (3), and the outer sides of the semi-annular shaped charge structures (4) are connected to detonators (5); The target tubular structure is arranged underwater; the structural center of gravity of the two semi-annular shaped charge structures (4) is within the cutting plane of the target tubular structure; With the direction close to the target tubular structure as the inner side and the direction away from the target tubular structure as the outer side, the two positioning devices (2) are arranged outside the cutting position of the target tubular structure, and the two positioning devices (2) are fixed to each other; Two semi-annular shaped charge structures (4) are arranged outside the cutting position of the target tubular structure, the two semi-annular shaped charge structures (4) are fixed to each other, and each semi-annular shaped charge structure (4) includes a plurality of equally divided cutting units (41).

2. The underwater explosion high-efficiency energy-gathering cutting device based on combined charge according to claim 1 is characterized in that: The positioning device (2) comprises a semi-annular pipe clamp (22), a plurality of first lifting rings (21) are arranged on the outer wall of the pipe clamp (22), the first lifting ring (21) is connected to one end of the connecting device (3), and the two ends of the pipe clamp (22) are respectively connected to a fixing plate, and the fixing plate is provided with a positioning through hole (23), and the fixing stud (1) passes through the positioning through holes (23) on the same side of the two positioning devices (2) to fix the two positioning devices (2) to each other.

3. The underwater explosion high-efficiency energy-gathering cutting device based on combined charge according to claim 2 is characterized in that: A rubber pad (24) is provided on the inner side of the pipe clamp (22).

4. The underwater explosion high-efficiency energy-gathering cutting device based on combined charge according to claim 1 is characterized in that: One ends of the two semi-annular shaped charge structures (4) are connected via a hinge structure (45), and the other ends of the two semi-annular shaped charge structures (4) are connected via a fixing block (42) and a magnetic rubber plate (43).

5. The underwater explosion high-efficiency energy-gathering cutting device based on combined charge according to claim 1 is characterized in that: The cutting unit (41) comprises a shell (413), the outer side of the shell (413) is a charge structure, the inner side of the shell (413) is a cavity (414), and a second lifting ring (44) is provided on the shell of the shell (413) close to the positioning device (2), and the second lifting ring (44) is connected to one end of the connecting device (3); The charge structure comprises an inner shell (418) and a charge liner (417), the inner side of the inner shell (418) is connected to the charge liner, the space formed by the inner shell (418) and the charge liner is filled with explosive (411), and the inner shell (418) and the outer shell (413) are respectively provided with detonator holes (412) at relative positions, and the detonator holes (412) are connected to the detonator (5).

6. The underwater explosion high-efficiency energy-gathering cutting device based on combined charge according to claim 5 is characterized in that: The outer surface of the inner shell (418) is provided with a T-shaped structure (419), the inner surface of the outer shell (413) is provided with a T-shaped groove, and the inner shell (418) and the outer shell (413) are connected via the T-shaped structure (419) and the T-shaped groove.

7. The underwater explosion high-efficiency energy-gathering cutting device based on combined charge according to claim 5 is characterized in that: The medicine liner (417) is a spherical-segment medicine liner.

8. The underwater explosion high-efficiency energy-gathering cutting device based on combined charge according to claim 5 is characterized in that: An axial reinforcement member (415) and a circumferential reinforcement member (416) are arranged inside the cavity (414).

9. The underwater explosion high-efficiency energy-gathering cutting device based on combined charge according to claim 5 is characterized in that: In the cutting unit (41), the wall thickness satisfies t0≤t, where t is the thickness of the charge liner; the wall thickness of each structure in the axial direction satisfies t1=t2+t3, where t1 is the thickness of the outer shell (413) on the cavity side, t2 is the thickness of the inner shell (418) on the charge structure side, and t3 is the thickness of the outer shell (413) on the charge structure side, and t3≤t2 is satisfied at the same time.

10. The underwater explosion high-efficiency energy-gathering cutting device based on combined charge according to claim 5 is characterized in that: In the cutting unit (41), S≤2L, S is the hole length, and L is the charge height.

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