A high-pressure water jet and mechanical cutting combined underwater ditching device

Abstract

The utility model discloses a high pressure water flow injection and mechanical cutting combined type underwater ditching device belongs to the bottom of the sea cable -laying equipment technical field, solves the technical problem of the effect of poor in solid soil of traditional injection sword in prior art. Its whole is the injection sword with cutting function, and the injection sword includes injection sword pipeline main part and reciprocating mechanism, and the injection sword pipeline main part is mechanical reciprocating saw type cutting structure, and the front side wall of injection sword pipeline main part is equipped with the downward inclined lower nozzle, reciprocating mechanism includes hydraulic motor, cam mechanism and the reciprocating base of being located on the upper end of injection sword pipeline main part, and the cam mechanism is driven to rotate by hydraulic motor, drives injection sword pipeline main part to reciprocate up and down, thereby controls the retraction and extension of injection sword pipeline main part upper portion in reciprocating base, be located in the reciprocating base and be equipped with high pressure water inlet, and high pressure water inlet is connected with lower nozzle through the water of injection sword pipeline main part inside and goes.

Description

Technical Field

[0001] This utility model relates to the technical field of submarine cable laying equipment, specifically a composite underwater trenching device combining high-pressure water jetting and mechanical cutting. Background Technology

[0002] The existing jetting swords used in submarine cable laying equipment simply use high-pressure water jets to wash away the soil. For firm and dense underwater soil, their trenching ability is very limited and cannot meet the actual needs of underwater submarine cable laying operations, resulting in a significant reduction in the efficiency of underwater cable laying operations. Summary of the Invention

[0003] This invention addresses the shortcomings and deficiencies of existing technologies by providing a composite underwater trenching device that combines high-pressure water jetting with mechanical cutting, based on the original high-pressure water jetting trenching mode, by adding a mechanical mechanism to enable the jetting sword to reciprocate.

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution: The high-pressure water jetting and mechanical cutting composite underwater trenching device provided by this utility model is an overall jetting sword with cutting function. The jetting sword includes a jetting sword pipeline body and a reciprocating mechanism. The jetting sword pipeline body is a mechanical reciprocating saw-type cutting structure. A downwardly inclined lower nozzle is provided on the front side wall of the jetting sword pipeline body.

[0005] The reciprocating mechanism includes a hydraulic motor, a cam mechanism, and a reciprocating base located at the upper end of the jet sword pipe body. The upper end of the jet sword pipe body is inserted into the reciprocating base. The cam mechanism is installed inside the reciprocating base. One end of the cam mechanism is connected to the output shaft of the hydraulic motor, and the other end is connected to the upper end of the jet sword pipe body. The hydraulic motor drives the cam mechanism to rotate, thereby driving the jet sword pipe body to reciprocate up and down, thus controlling the upper part of the jet sword pipe body to retract and extend in the reciprocating base.

[0006] A high-pressure water inlet is located on the reciprocating base, and the high-pressure water inlet is connected to the lower nozzle through the water flow inside the jet sword pipeline body.

[0007] Preferably, the bottom edge of the reciprocating base is provided with a limiting snap-fit ​​part that matches the upper end of the jet sword pipeline body, and the upper part of the jet sword pipeline body can slide back and forth inside the reciprocating base.

[0008] Preferably, the cam mechanism includes two parallel cams and a cam follower connected by a sliding shaft. The two ends of the sliding shaft are respectively connected to the top edges of the two parallel cams. The cam follower is connected to the upper part of the jet sword pipe body, and the cam is connected to the upper end of the jet sword pipe body through the cam follower.

[0009] The cam follower has a transverse through hole, and the sliding shaft between the two parallel cams passes through the transverse through hole longitudinally and can slide laterally within the transverse through hole. The outer diameter of the sliding shaft matches the width of the transverse through hole.

[0010] The hydraulic motor drives the cam to rotate. When the cam rotates, it drives the cam follower to move up and down through the sliding shaft, which in turn drives the main body of the jet sword pipeline to move up and down.

[0011] Preferably, the inner wall of the reciprocating base is provided with a sliding plug with a sealing element that matches the two side walls of the cam follower. The two sides of the cam follower move up and down along the inner wall of the reciprocating base through the sliding plug.

[0012] Preferably, a guide rail and a slide block are also provided on the rear side wall of the main body of the jet sword pipeline;

[0013] A fixing block matching the guide rail and slide is connected to the rear side wall of the reciprocating base. A guide rod is connected between the fixing block and the slide. One end of the guide rod is fixedly connected to the fixing block, and the other end passes through the slide. The slide is fixedly connected to the main body of the jet sword pipeline. The slide can slide back and forth along the guide rod and guide rail simultaneously with the main body of the jet sword pipeline.

[0014] Preferably, when the sliding shaft of the cam driven by the hydraulic motor rotates to the highest position, the sliding shaft slides to the middle position of the transverse through hole of the cam follower, and the main body of the jet sword pipeline retracts into the reciprocating base to the maximum extent, at which time the overall length of the device is the shortest.

[0015] When the sliding shaft of the cam driven by the hydraulic motor continues to rotate to the rightmost position, the sliding shaft slides to the right end of the transverse through hole of the cam follower, causing the main body of the jet sword pipeline to gradually extend downwards, and the main body of the jet sword pipeline gradually extends out of the reciprocating base.

[0016] When the sliding shaft of the cam driven by the hydraulic motor continues to rotate to the lowest position, the sliding shaft slides to the middle position of the transverse through hole of the cam follower, causing the main body of the jet sword pipeline to extend further downward to the lowest position. The moving part of the main body of the jet sword pipeline extends completely out of the reciprocating base, at which point the overall length of the device is at its longest.

[0017] When the sliding shaft of the cam driven by the hydraulic motor continues to rotate to the leftmost position, the sliding shaft slides to the leftmost position of the transverse through hole of the cam follower, causing the main body of the jet sword pipeline to gradually retract upwards, and the main body of the jet sword pipeline retracts into the reciprocating base.

[0018] As the sliding shaft of the cam driven by the hydraulic motor continues to rotate to the highest position, the sliding shaft slides to the middle position of the transverse through hole of the cam follower, and the main body of the jet sword pipeline continues to retract upward until the main body of the jet sword pipeline is retracted into the reciprocating base at its maximum position. At this time, the overall length of the device returns to its shortest position.

[0019] Preferably, side nozzles matching the lower nozzle are also provided on the bottom sidewalls of the jet sword pipeline body located on both sides of the lower nozzle;

[0020] The high-pressure water inlet is connected to the side nozzles through the water flow inside the jet sword pipeline.

[0021] Preferably, the side wall of the jet sword pipeline body is provided with a row of downward vertical nozzles with staggered inclination angles, and the side wall of the jet sword pipeline body is provided with a row of side nozzles with the same vertical inclination angle.

[0022] Preferably, the water jet from the lower nozzle is a high-pressure water jet, and the water jet from the side nozzle is also a high-pressure water jet.

[0023] This utility model provides a combined underwater trenching device integrating high-pressure water jetting and mechanical cutting. It has the following beneficial effects:

[0024] This utility model discloses a composite underwater trenching device combining high-pressure water jetting and mechanical cutting. The device has a simple and ingenious structure and is stable. It adds a reciprocating mechanical cutting function to the traditional method of trenching by simply spraying high-pressure water jets to wash the soil. Through the continuous rotation of the cam driven by the hydraulic motor, the jetting sword composed of the jetting sword pipeline body and the nozzle can continuously and effectively cut the underwater soil. It saves time and labor, significantly improves the efficiency of underwater deep trenching operations, and meets the actual use needs.

[0025] Especially for firm and dense soils, the trenching capacity and efficiency are greatly improved. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of this utility model;

[0027] Figure 2 for Figure 1 A structural schematic diagram of the left view;

[0028] Figure 3 for Figure 2 A structural schematic diagram of the enlarged view of section I;

[0029] Figure 4 for Figure 1 A structural schematic diagram of the enlarged view of section II;

[0030] Figure 5 for Figure 2 A schematic diagram of the structure in the AA sectional view;

[0031] Figure 6 for Figure 1 A schematic diagram of the structure of a three-dimensional image;

[0032] Figure 7 This is a structural diagram of the combined high-pressure water jet and mechanical cutting underwater trenching device of this utility model in use (the main body of the jetting sword pipe is retracted to its shortest position).

[0033] Figure 8 This is a structural diagram of the combined high-pressure water jet and mechanical cutting underwater trenching device of this utility model in use (the main body of the jetting sword pipe is extended downwards).

[0034] Figure 9 This is a structural diagram of the combined high-pressure water jet and mechanical cutting underwater trenching device of this utility model in use (the jetting pipe body extends downwards at its longest position).

[0035] Figure 10 This is a structural diagram of the combined high-pressure water jet and mechanical cutting underwater trenching device of this utility model in use (the main body of the jetting sword pipeline is retracted upwards).

[0036] Figure 11 for Figure 5 A schematic diagram of the cam mechanism.

[0037] In the diagram: 1. Main body of the jet sword pipeline, 2. Lower nozzle, 3. Hydraulic motor, 4. Cam, 5. Reciprocating base, 6. High-pressure water inlet, 7. Cam follower, 8. Transverse through hole, 9. Sliding shaft, 10. Slide seat, 11. Fixing block, 12. Guide rod, 13. Side nozzle, 14. Sliding plug. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0039] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0040] Please see Figures 1-11 This utility model provides a technical solution:

[0041] This utility model provides a high-pressure water jetting and mechanical cutting composite underwater trenching device, which is essentially a jetting sword with a cutting function. The jetting sword includes a jetting sword pipeline body 1 and a reciprocating mechanism. The jetting sword pipeline body 1 has a mechanical reciprocating sawing structure. A downwardly inclined lower nozzle 2 is provided on the front side wall of the jetting sword pipeline body 1. Side nozzles 13, matching the lower nozzles 2, are also provided on the bottom side wall of the jetting sword pipeline body 1 on both sides of the lower nozzles 2. A high-pressure water inlet 6 is connected to the side nozzles 13 through water flow inside the jetting sword pipeline body 1. The water jetting from the lower nozzles 2 and the side nozzles 13 are both high-pressure water jets. The side wall of the jetting sword pipeline body 1 has a vertical row of downwardly arranged lower nozzles 2 with staggered inclination angles, and a vertical row of side nozzles 13 with the same inclination angle. This nozzle structure design allows the jetting sword to be inserted into the soil and perform a mechanical reciprocating sawing action.

[0042] The reciprocating mechanism includes a hydraulic motor 3, a cam mechanism, and a reciprocating base 5 located at the upper end of the jet sword pipe body 1. The upper end of the jet sword pipe body 1 is inserted into the reciprocating base 5. The cam mechanism is installed inside the reciprocating base 5, with one end connected to the output shaft of the hydraulic motor 3 and the other end connected to the upper end of the jet sword pipe body 1. The hydraulic motor 3 drives the cam mechanism to rotate, causing the jet sword pipe body 1 to reciprocate up and down, thereby controlling the upper part of the jet sword pipe body 1 to retract and extend in the reciprocating base 5. A high-pressure water inlet 6 is provided on the reciprocating base 5. The high-pressure water inlet 6 is connected to the lower nozzle 2 through a flexible connecting pipe via water flowing inside the jet sword pipe body 1. The above-described structure is a composite underwater trenching device combining high-pressure water jetting and mechanical cutting. The jetting sword with cutting function is mounted on an underwater trenching machine. During operation, it can be inserted into the soil and move forward. During this forward movement, a hydraulic motor 3 drives a cam mechanism, causing the jetting sword pipeline body 1 to reciprocate, cutting and excavating the soil. Simultaneously, the trenching machine provides high-pressure water jetting, which is ejected from the nozzle through a flexible connecting pipe inside the jetting sword pipeline body 1, flushing the soil to form deep trenches. The mechanical cutting structure and high-pressure water jetting work synergistically, saving time and labor, significantly improving the efficiency of cable laying and trenching in special underwater environments with hard soil, and meeting practical application needs.

[0043] The bottom edge of the reciprocating base 5 is provided with a limiting snap-fit ​​part that matches the upper end of the jet sword pipeline body 1. The upper part of the jet sword pipeline body 1 can slide up and down in the reciprocating base 5. This structure can limit the relative sliding distance between the reciprocating base 5 and the jet sword pipeline body 1, ensuring that the reciprocating motion of the entire jet sword pipeline body 1 nozzle is continuous and effective.

[0044] like Figure 11As shown, the cam mechanism includes two parallel cams 4 and a cam follower 7 connected by a sliding shaft 9. The two ends of the sliding shaft 9 are respectively connected to the top edges of the two parallel cams 4. The cam follower 7 is connected to the upper part of the jet sword pipe body 1. The cams 4 are connected to the upper end of the jet sword pipe body 1 through the cam follower 7.

[0045] The cam follower 7 has a transverse through hole 8. A sliding shaft 9 between two parallel cams 4 passes longitudinally through the transverse through hole 8 and can slide laterally within the transverse through hole 8. The outer diameter of the sliding shaft 9 matches the width of the transverse through hole 8, and the side walls of the cam follower 7 and the cam 4 are arranged relatively parallel to each other to ensure the effectiveness of the entire sliding shaft 9 in driving the reciprocating motion of the jet sword pipeline body 1. The hydraulic motor 3 drives the cam 4 to rotate. When the cam 4 rotates, it drives the cam follower 7 to move up and down through the sliding shaft 9, ultimately driving the jet sword pipeline body 1 to move up and down.

[0046] The inner wall of the reciprocating base 5 is provided with a sliding plug 14 with a sealing element that matches the two side walls of the cam follower 7. The two sides of the cam follower 7 move up and down along the inner wall of the reciprocating base 5 through the sliding plug 14, which further ensures that the cam follower 7 drives the jet sword pipeline body 1 to move up and down in the reciprocating base 5 in a stable path, and further enhances the effectiveness of the jet sword in cutting hard soil.

[0047] A guide rail and a slide block 10 are also provided on the rear side wall of the jet sword pipeline body 1; a fixing block 11 matching the guide rail and slide block 10 is connected on the rear side wall of the reciprocating base 5. A guide rod 12 is connected between the fixing block 11 and the slide block 10. One end of the guide rod 12 is fixedly connected to the fixing block 11, and the other end passes through the slide block 10. The slide block 10 is fixedly connected to the jet sword pipeline body 1. The slide block 10 can slide back and forth along the guide rod 12 and the guide rail simultaneously with the jet sword pipeline body 1, further enhancing the robustness and effectiveness of the jet sword's reciprocating cutting function on hard soil, ensuring the continuous underwater trenching operation, and meeting the needs of actual underwater special operating environments.

[0048] The specific steps are as follows:

[0049] like Figure 7 As shown, when the hydraulic motor 3 drives the sliding shaft 9 of the cam 4 to rotate to the highest position, the sliding shaft 9 slides to the middle position of the transverse through hole 8 of the cam follower 7, and the main body 1 of the jet sword pipeline retracts into the reciprocating base 5 to the maximum extent. At this time, the overall length of the device is the shortest.

[0050] like Figure 8As shown, when the hydraulic motor 3 drives the sliding shaft 9 of the cam 4 to continue rotating to the rightmost position, the sliding shaft 9 slides to the right end of the transverse through hole 8 of the cam follower 7, causing the main body of the jet sword pipeline 1 to gradually extend downwards, and the main body of the jet sword pipeline 1 gradually extends out of the reciprocating base 5.

[0051] like Figure 9 As shown, when the hydraulic motor 3 drives the sliding shaft 9 of the cam 4 to continue rotating to the lowest position, the sliding shaft 9 slides to the middle position of the transverse through hole 8 of the cam follower 7, which drives the main body of the jet sword pipeline 1 to extend further downward to the lowest position. The movable part of the main body of the jet sword pipeline 1 extends completely out of the reciprocating base 5, and at this time the overall length of the device is the longest.

[0052] like Figure 10 As shown, when the hydraulic motor 3 drives the sliding shaft 9 of the cam 4 to continue rotating to the leftmost position, the sliding shaft 9 slides to the leftmost position of the transverse through hole 8 of the cam follower 7, causing the main body of the jet sword pipeline 1 to gradually retract upwards, and the main body of the jet sword pipeline 1 retracts back into the reciprocating base 5.

[0053] like Figure 7 As shown, when the sliding shaft 9 of the cam 4 driven by the hydraulic motor 3 continues to rotate to the top position, the sliding shaft 9 slides to the middle position of the transverse through hole 8 of the cam follower 7, and the main body 1 of the jet sword pipeline continues to retract upward until the main body 1 of the jet sword pipeline is retracted into the reciprocating base 5 at its maximum position. At this time, the overall length of the device returns to its shortest position.

[0054] Ultimately, the main body 1 of the jet sword pipeline is reciprocated by extending and retracting within the reciprocating base 5.

[0055] The composite underwater trenching device of this utility model is carried by an underwater trenching machine. During the forward movement, the main body 1 of the spray sword pipe with nozzles moves forward and is inserted into the soil during operation. The hydraulic motor 3 drives the cam mechanism to drive the spray sword pipe main body 1 to reciprocate and cut and excavate the soil. At the same time, the trenching machine provides high-pressure water flow, which is sprayed out from the nozzle inside the spray sword pipe main body 1 to wash the soil and form a deep trench.

[0056] In summary, this utility model's high-pressure water jetting and mechanical cutting composite underwater trenching device has a simple and ingenious structure and a stable structure. It adds a reciprocating mechanical cutting function to the traditional method of trenching using a jetting sword that simply sprays high-pressure water to wash away the soil. Through the continuous rotation of the cam 4 driven by the hydraulic motor 3, the jetting sword, consisting of the main body 1 of the jetting sword pipeline and the nozzle, continuously and effectively cuts the underwater soil. This saves time and labor, significantly improves the efficiency of deep underwater trenching operations, and meets practical application needs. It is particularly effective for trenching in firm and dense soils, greatly enhancing both trenching capacity and efficiency.

[0057] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A combined high-pressure water jetting and mechanical cutting underwater trenching device, characterized in that, The whole is a jet sword with cutting function. The jet sword includes a jet sword pipeline body (1) and a reciprocating mechanism. The jet sword pipeline body (1) is a mechanical reciprocating saw-type cutting structure. The front side wall of the jet sword pipeline body (1) is provided with a downwardly inclined lower nozzle (2). The reciprocating mechanism includes a hydraulic motor (3), a cam mechanism, and a reciprocating base (5) located at the upper end of the jet sword pipeline body (1). The upper end of the jet sword pipeline body (1) is inserted into the reciprocating base (5). The cam mechanism is installed inside the reciprocating base (5). One end of the cam mechanism is connected to the output shaft of the hydraulic motor (3), and the other end is connected to the upper end of the jet sword pipeline body (1). The hydraulic motor (3) drives the cam mechanism to rotate, thereby causing the jet sword pipeline body (1) to move up and down reciprocally, thereby controlling the upper part of the jet sword pipeline body (1) to retract and extend in the reciprocating base (5). A high-pressure water inlet (6) is provided on the reciprocating base (5), and the high-pressure water inlet (6) is connected to the lower nozzle (2) through the water flow inside the jet sword pipeline body (1).

2. The underwater trenching device combining high-pressure water jetting and mechanical cutting according to claim 1, characterized in that, The bottom edge of the reciprocating base (5) is provided with a limiting snap-fit ​​part that matches the upper end of the jet sword pipeline body (1), and the upper part of the jet sword pipeline body (1) can slide back and forth inside the reciprocating base (5).

3. The underwater trenching device combining high-pressure water jetting and mechanical cutting according to claim 2, characterized in that, The cam mechanism includes two parallel cams (4) and a cam follower (7) connected by a sliding shaft (9). The two ends of the sliding shaft (9) are respectively connected to the top edges of the two parallel cams (4). The cam follower (7) is connected to the upper part of the jet sword pipeline body (1). The cam (4) is connected to the upper end of the jet sword pipeline body (1) through the cam follower (7). The cam follower (7) is provided with a transverse through hole (8), and the sliding shaft (9) between the two parallel cams (4) passes through the transverse through hole (8) longitudinally and can slide laterally in the transverse through hole (8). The outer diameter of the sliding shaft (9) matches the width of the transverse through hole (8). The hydraulic motor (3) drives the cam (4) to rotate. When the cam (4) rotates, it drives the cam follower (7) to move up and down through the sliding shaft (9), which in turn drives the main body (1) of the jet sword pipeline to move up and down.

4. The underwater trenching device combining high-pressure water jetting and mechanical cutting according to claim 3, characterized in that, The inner wall of the reciprocating base (5) is provided with a sliding plug (14) with a sealing element that matches the two side walls of the cam follower (7). The two sides of the cam follower (7) move up and down along the inner wall of the reciprocating base (5) through the sliding plug (14).

5. The underwater trenching device combining high-pressure water jetting and mechanical cutting according to claim 3, characterized in that, A guide rail and a slide block (10) are also provided on the rear side wall of the main body (1) of the jet sword pipeline. A fixing block (11) matching the guide rail and slide (10) is connected to the rear side wall of the reciprocating base (5). A guide rod (12) is connected between the fixing block (11) and the slide (10). One end of the guide rod (12) is fixedly connected to the fixing block (11), and the other end passes through the slide (10). The slide (10) is fixedly connected to the main body of the jet sword pipeline (1). The slide (10) can slide back and forth along the guide rod (12) and the guide rail simultaneously with the main body of the jet sword pipeline (1).

6. The underwater trenching device combining high-pressure water jetting and mechanical cutting according to claim 3, characterized in that, The hydraulic motor (3) drives the sliding shaft (9) of the cam (4) to rotate to the top position. The sliding shaft (9) slides to the middle position of the transverse through hole (8) of the cam follower (7). The main body (1) of the jet sword pipeline is retracted into the reciprocating base (5) to the maximum extent. At this time, the overall length of the device is the shortest. The hydraulic motor (3) drives the sliding shaft (9) of the cam (4) to continue rotating to the rightmost position. The sliding shaft (9) slides to the right end of the transverse through hole (8) of the cam follower (7), causing the main body of the jet sword pipeline (1) to gradually extend downward. The main body of the jet sword pipeline (1) gradually extends out of the reciprocating base (5). The hydraulic motor (3) drives the sliding shaft (9) of the cam (4) to continue rotating to the lowest position. The sliding shaft (9) slides to the middle position of the transverse through hole (8) of the cam follower (7), which drives the main body of the jet sword pipeline (1) to extend further downward to the lowest position. The movable part of the main body of the jet sword pipeline (1) extends completely out of the reciprocating base (5). At this time, the overall length of the device is the longest. The hydraulic motor (3) drives the sliding shaft (9) of the cam (4) to continue rotating to the leftmost position. The sliding shaft (9) slides to the leftmost position of the transverse through hole (8) of the cam follower (7), causing the main body of the jet sword pipeline (1) to gradually retract upwards. The main body of the jet sword pipeline (1) retracts back into the reciprocating base (5). The sliding shaft (9) of the cam (4) driven by the hydraulic motor (3) continues to rotate to the top position. The sliding shaft (9) slides to the middle position of the transverse through hole (8) of the cam follower (7). The main body of the jet sword pipeline (1) continues to retract upward until the main body of the jet sword pipeline (1) is retracted into the reciprocating base (5) at its maximum position. At this time, the overall length of the device returns to its shortest position.

7. The underwater trenching device combining high-pressure water jetting and mechanical cutting according to claim 1, characterized in that, Side nozzles (13) matching the lower nozzle (2) are also provided on the bottom sidewall of the jet sword pipeline body (1) located on both sides of the lower nozzle (2). The high-pressure water inlet (6) is connected to the side nozzle (13) through the water flow inside the main body (1) of the jet sword pipeline.

8. The underwater trenching device combining high-pressure water jetting and mechanical cutting according to claim 7, characterized in that, The main body (1) of the jet sword pipeline has a vertically arranged downward nozzle (2) with staggered inclination angles, and the main body (1) of the jet sword pipeline has a vertically arranged side nozzle (13) with the same inclination angle.

9. The underwater trenching device combining high-pressure water jetting and mechanical cutting according to claim 8, characterized in that, The water jet from the lower nozzle (2) is a high-pressure water jet, and the water jet from the side nozzle (13) is also a high-pressure water jet.

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