Water flow jetting mechanism and underwater ditching and cable laying robot

Abstract

The utility model belongs to the technical field of underwater cable laying robot equipment, and particularly relates to a water jet mechanism and an underwater ditching cable laying robot, the water jet mechanism at least comprises a first jet water pump, a second jet water pump and a third jet water pump; a water outlet of the first jet water pump is connected with a first control valve, a water outlet of the second jet water pump is connected with a second control valve, and a water outlet of the third jet water pump is connected with a third control valve; the water flow spraying mechanism further comprises a water tank or a three-way connector, and the water tank or the three-way connector is used for enabling the multiple spraying water pumps to be communicated with the first spraying cutter or the second spraying cutter. By arranging the third jet water pump, high-pressure water flow is supplied to the corresponding jet cutter when the first jet water pump or the second jet water pump breaks down, so that the underwater ditching and cable laying robot can continue to work, and the robot returns to the land to process the broken-down water pump after the work is finished.

Description

TECHNICAL FIELD

[0001] The utility model belongs to underwater cable laying robot equipment technical field, concretely relates to water flow injection mechanism and underwater ditching cable laying robot. BACKGROUND

[0002] The burying plough is a common underwater ditching cable laying robot, which is usually equipped with two jet water pumps, the jet water pumps are installed on the robot body, the jet water pumps output water to the jetting knife, and the jetting knife outputs to the water bed to wash away the silt at the water bottom, so that a ditch is formed for cable laying, and the burying plough has no power and is pulled forward by the mother ship. When the jet water pump fails during operation, the operation efficiency of the burying plough is greatly reduced, and even the burying plough cannot operate. Therefore, the mother ship usually carries a jet water pump as a spare, and the common practice when the jet water pump fails is to hoist the burying plough out of the water to the mother ship to replace the spare jet water pump, which undoubtedly consumes time and effort. Once the offshore construction is interrupted, from hoisting the equipment to repairing and starting the construction again, not only more manpower and time costs are consumed, but also the completion cycle of the construction operation is prolonged. SUMMARY

[0003] In order to overcome the defects of the prior art, the utility model provides a water flow injection mechanism to solve the problem that the prior art needs to hoist the burying plough out of the water to the mother ship to replace the spare jet water pump when the jet water pump fails, which consumes more manpower and time costs, and also prolongs the completion cycle of the construction operation.

[0004] One scheme of the utility model provides a water flow injection mechanism, which at least comprises a first jet water pump, a second jet water pump, a third jet water pump and a water tank.

[0005] The water outlet of the first jet water pump is connected with a first control valve, and the first control valve is communicated with the water tank through a first water outlet pipeline.

[0006] The water outlet of the second jet water pump is connected with a second control valve, and the second control valve is connected with the water tank through a second water outlet pipeline.

[0007] The water outlet of the third jet water pump is connected with a third control valve, and the third control valve is connected with the water tank through a third water outlet pipeline.

[0008] The water outlet of the water tank is communicated with a first jetting knife and a second jetting knife.

[0009] In one scheme of the utility model, the first control valve, the second control valve and the third control valve are one-way valves.

[0010] In one scheme of the utility model, the third jet water pump is set to a closed state.

[0011] The third jet water pump is configured to start when at least one of the first jet water pump and the second jet water pump fails, for conveying water flow to the water tank through the third water outlet pipeline; and the first control valve and the second control valve are used to prevent the reverse flow of water flow in the water tank.

[0012] In one of the schemes of the utility model, the first control valve, the second control valve and the third control valve are electronic butterfly valves.

[0013] In one of the schemes of the utility model, the first control valve and the second control valve are set to be in the normally open state, and the third control valve is set to be in the normally closed state.

[0014] In one of the schemes of the utility model, the third jet water pump is set to be in the closed state; and the third jet water pump, the first control valve, the second control valve and the third control valve are configured to:

[0015] When the first jet water pump fails, the first control valve is switched to the closed state, the third control valve is switched to the open state, and the third jet water pump is started to supply water to the water tank through the third water outlet pipeline;

[0016] or, when the second jet water pump fails, the second control valve is switched to the closed state, the third control valve is switched to the open state, and the third jet water pump is started to supply water to the water tank through the third water outlet pipeline;

[0017] or, when the first jet water pump and the second jet water pump fail, the first control valve and the second control valve are switched to the closed state, the third control valve is switched to the open state, and the third jet water pump is started to supply water to the water tank through the third water outlet pipeline.

[0018] One of the schemes of the utility model provides a water flow jetting mechanism, which at least comprises a first jet water pump, a second jet water pump, a third jet water pump and a tee joint;

[0019] The water outlet of the first jet water pump is connected with a first control valve, and the first control valve is connected with a first jet cutter through a first water outlet pipeline;

[0020] The water outlet of the second jet water pump is connected with a second control valve, and the second control valve is connected with a second jet cutter through a second water outlet pipeline;

[0021] The water outlet of the third jet water pump is connected with a fourth control valve and a fifth control valve through the tee joint, the fourth control valve is communicated with the first water outlet pipeline, and the fifth control valve is communicated with the second water outlet pipeline.

[0022] In one of the schemes of the utility model, the first control valve and the second control valve are one-way valves.

[0023] The fourth control valve and the fifth control valve are electronic butterfly valves.

[0024] In one of the schemes of the utility model, the third jet water pump is set to a closed state, and the fourth control valve and the fifth control valve are set to a normally closed state.

[0025] The third jet water pump and the fourth control valve are configured to switch the fourth control valve to a communication state when the first jet water pump fails, and the third jet water pump is started to deliver water flow to the first jet knife through the first water outlet pipeline.

[0026] Alternatively, the third jet water pump and the fifth control valve are configured to switch the fifth control valve to a communication state when the second jet water pump fails, and the third jet water pump is started to deliver water flow to the second jet knife through the second water outlet pipeline.

[0027] Alternatively, the third jet water pump, the fourth control valve and the fifth control valve are configured to switch the fourth control valve and the fifth control valve to a communication state when the first jet water pump and the second jet water pump fail, and the third jet water pump is started to deliver water flow to the first jet knife through the first water outlet pipeline and to the second jet knife through the second water outlet pipeline.

[0028] One of the schemes of the utility model provides an underwater ditching and cable laying robot, which comprises a burying plough main body and the above-mentioned water flow jetting mechanism.

[0029] The water flow jetting mechanism and the underwater ditching and cable laying robot provided by the utility model can achieve the following technical effects:

[0030] 1. When the jet water pump fails, the third jet water pump replaces the failed water pump to supply high-pressure water flow to the jet knife, so that the underwater ditching and cable laying robot using the water flow jetting mechanism of the utility model can continue to work, and temporary maintenance is not required, and the work is completed and returned to land for processing.

[0031] 2. By arranging the control valve at the water outlet of the jet water pump, when the third jet water pump replaces the failed water pump to supply water, the backflow of water flow from the water outlet of the failed water pump can be effectively reduced or avoided, and the working efficiency of the underwater ditching and cable laying robot is ensured.

[0032] 3. By adopting the electronic butterfly valve as the control valve, different water supply pipelines can be formed, so that the water flow output by the third jet water pump is effectively transmitted to the jetting knife corresponding to the fault water pump, and the flow reduction caused by the water flow being branched is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained according to the structures shown in the drawings without creative labor for those skilled in the art.

[0034] Figure 1 A structure diagram showing that the water flow jetting mechanism of the present application comprises a water tank;

[0035] Figure 2 A structure diagram showing that the water flow jetting mechanism of the present application adopts a one-way valve;

[0036] Figure 3 A structure diagram showing that the water flow jetting mechanism of the present application adopts an electronic butterfly valve;

[0037] Figure 4 A structure diagram showing that the water flow jetting mechanism of the present application comprises a three-way joint;

[0038] Figure 5 A structure diagram showing that the water flow jetting mechanism of the present application simultaneously adopts a one-way valve and an electronic butterfly valve;

[0039] Figure 6 A structure diagram showing the underwater ditching and cable laying robot of the present application.

[0040] The following is the explanation of the reference signs:

[0041] 1-first jet water pump; 11-first control valve; 12-first water outlet pipeline; 2-second jet water pump; 21-second control valve; 22-second water outlet pipeline; 3-third jet water pump; 31-third control valve; 32-third water outlet pipeline; 33-fourth control valve; 34-fifth control valve; 4-water tank; 5-first jetting knife; 6-second jetting knife; 7-three-way joint;

[0042] 100-underwater ditching and cable laying robot; 110-buried plow body. DETAILED DESCRIPTION

[0043] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0044] Embodiment application background

[0045] It can be understood that when the water flow spraying mechanism of the present application is applied to the underwater ditching and cable laying robot, the control system and power supply on the underwater ditching and cable laying robot are used for control and power supply, the first spraying water pump 1, the second spraying water pump 2 and the third spraying water pump 3 can be respectively turned on or turned off through the control system; and whether the first spraying water pump 1 and the second spraying water pump 2 are faulty is identified by the control system; the fault refers to a fault state of the spraying water pump, and the fault state at least includes that the spraying water pump cannot run and the flow rate of the water flow delivered is insufficient.

[0046] In the prior art, when both of the spraying water pumps are faulty, the burying plow cannot work; or when one of the spraying water pumps is faulty, the other spraying water pump works normally, and the water discharged from the normally working spraying water pump not only flows to the spraying knife to continue working, but also flows into the water outlet of the faulty spraying water pump, and then flows out of the water inlet, which greatly reduces the working efficiency, and even the faulty spraying water pump cannot work due to too much loss.

[0047] Embodiment 1

[0048] To solve the problems in the prior art, with reference to Figure 1 , 2 and Figure 6 , the present application provides a water flow spraying mechanism, which at least comprises a first spraying water pump 1, a second spraying water pump 2, a third spraying water pump 3 and a water tank 4.

[0049] A first control valve 11 is connected to the water outlet of the first spraying water pump 1, and the first control valve 11 is communicated with the water tank 4 through a first water outlet pipeline 12.

[0050] A second control valve 21 is connected to the water outlet of the second spraying water pump 2, and the second control valve 21 is connected with the water tank 4 through a second water outlet pipeline 22.

[0051] A third control valve 31 is connected to the water outlet of the third spraying water pump 3, and the third control valve 31 is connected with the water tank 4 through a third water outlet pipeline 32.

[0052] The water outlet of the water tank 4 is communicated with a first spraying knife 5 and a second spraying knife 6 respectively.

[0053] Further, the first control valve 11, the second control valve 21 and the third control valve 31 are one-way valves; the third jetting water pump 3 is set to a closed state.

[0054] Understandably, when the first control valve 11, the second control valve 21 and the third control valve 31 are all one-way valves, under normal operation, the first jetting water pump 1 and the second jetting water pump 2 are opened, the first jetting water pump 1 opens the first control valve 11 by water from the water outlet, the water flow converges to the water tank 4 through the first water outlet pipeline 12, the second jetting water pump 2 opens the second control valve 21 by water from the water outlet, the water flow converges to the water tank 4 through the second water outlet pipeline 22; the third jetting water pump 3 is not opened, and at the same time, because of the third control valve 31, the water in the water tank 4 cannot flow back from the third jetting water pump 3; since the water outlet of the water tank 4 is communicated with the first jetting cutter 5 and the second jetting cutter 6, the converged water flow is jetted from the first jetting cutter 5 and the second jetting cutter 6 under the action of pressure to perform ditching operation.

[0055] Understandably, when the first jetting water pump 1 fails, because of the first control valve 11, the water in the water tank 4 cannot flow back from the first jetting water pump 1. At this time, the third jetting water pump 3 is opened, the third jetting water pump 3 opens the third control valve 31 by water, and converges to the water tank 4 through the third water outlet pipeline 32. Since the third jetting water pump 3 replaces the first jetting water pump 1 to supply water, the water flow and water pressure in the water tank 4 can meet the operation requirements, the water in the water tank 4 is jetted from the first jetting cutter 5 and the second jetting cutter 6 under the action of pressure to perform ditching operation, so that the operation of the underwater ditching and cable laying robot is not affected. Understandably, the processing mode when the second jetting water pump 2 fails is the same as when the first jetting water pump 1 fails.

[0056] Understandably, when the first jetting water pump 1 and the second jetting water pump 2 both fail, because of the first control valve 11 and the second control valve 21, the water in the water tank 4 cannot flow back from the first jetting water pump 1 and the second jetting water pump 2. At this time, the third jetting water pump 3 is opened, the third jetting water pump 3 opens the third control valve 31 by water, and converges to the water tank 4 through the third water outlet pipeline 32, so that the water flow and water pressure in the water tank 4 can meet the minimum operation requirements, the water in the water tank 4 is jetted from the first jetting cutter 5 and the second jetting cutter 6 under the action of pressure to perform ditching operation.

[0057] Therefore, the water flow jetting mechanism of the utility model can realize the following technical effects:

[0058] 1. When the jetting water pump fails, the third jetting water pump replaces the failed water pump to supply high-pressure water flow to the jetting cutter, so that the underwater ditching and cable laying robot using the water flow jetting mechanism of the utility model can continue to operate, temporarily without maintenance, and return to land for processing after the operation is completed.

[0059] 2. By setting the control valve at the water outlet of the jet water pump, when the third jet water pump replaces the faulty water pump for water supply, the backflow of water flow from the water outlet of the faulty water pump can be effectively reduced or avoided, and the working efficiency of the underwater ditching and cable laying robot is ensured.

[0060] Embodiment 2

[0061] Please refer to Figure 1 、 3 and Figure 6 The utility model provides a water flow jetting mechanism, at least including first jet water pump 1, second jet water pump 2, third jet water pump 3 and water tank 4;

[0062] The water outlet of first jet water pump 1 is connected with first control valve 11, and first control valve 11 is communicated with water tank 4 through first water outlet pipeline 12;

[0063] The water outlet of second jet water pump 2 is connected with second control valve 21, and second control valve 21 is connected with water tank 4 through second water outlet pipeline 22;

[0064] The water outlet of third jet water pump 3 is connected with third control valve 31, and third control valve 31 is connected with water tank 4 through third water outlet pipeline 32;

[0065] The water outlet of water tank 4 is communicated with first jetting cutter 5 and second jetting cutter 6 respectively.

[0066] Further, first control valve 11, second control valve 21 and third control valve 31 are electronic butterfly valves, first control valve 11 and second control valve 21 are set as normally open state, and third control valve 31 is set as normally closed state;Third jet water pump 3 is set as closed state.

[0067] It can be understood that when first control valve 11, second control valve 21 and third control valve 31 are all electronic butterfly valves, under normal working condition, first jet water pump 1 and second jet water pump 2 are opened, first control valve 11 and second control valve 21 are in open state, first jet water pump 1 discharges water from the water outlet and converges to water tank 4 through first water outlet pipeline 12, and second jet water pump 2 discharges water from the water outlet and converges to water tank 4 through second water outlet pipeline 22;Third jet water pump 3 is not opened, and third control valve 31 is in closed state, so that the water in water tank 4 cannot flow back from third jet water pump 3;Because the water outlet of water tank 4 is communicated with first jetting cutter 5 and second jetting cutter 6 respectively, the converged water flow is jetted from first jetting cutter 5 and second jetting cutter 6 under the action of pressure to carry out ditching operation.

[0068] Understandably, when the first jet water pump 1 fails, the first control valve 11 is switched to the closed state, and the water in the water tank 4 will not flow out from the first jet water pump 1. At this time, the third jet water pump 3 is turned on, and the third control valve 31 is switched to the open state, and the third jet water pump 3 discharges water and flows into the water tank 4 through the third water outlet pipeline 32. Since the third jet water pump 3 replaces the first jet water pump 1 to supply water, the water flow and water pressure in the water tank 4 meet the operation requirements, and the water in the water tank 4 is discharged from the first jet knife 5 and the second jet knife 6 under the action of pressure to perform trenching operation, so that the operation of the underwater trenching and cable laying robot is not affected. Understandably, the processing mode when the second jet water pump 2 fails is the same as when the first jet water pump 1 fails.

[0069] Understandably, when the first jet water pump 1 and the second jet water pump 2 both fail, the first control valve 11 and the second control valve 21 are switched to the closed state, and the water in the water tank 4 will not flow out from the first jet water pump 1 and the second jet water pump 2. At this time, the third jet water pump 3 is turned on, and the third control valve 31 is switched to the open state, and the third jet water pump 3 discharges water and flows into the water tank 4 through the third water outlet pipeline 32. The water flow and water pressure in the water tank 4 can meet the minimum operation requirements, and the water in the water tank 4 is discharged from the first jet knife 5 and the second jet knife 6 under the action of pressure to perform trenching operation.

[0070] Therefore, the water flow jetting mechanism of the utility model can realize the following technical effects:

[0071] 1、When the jet water pump fails, the third jet water pump 3 replaces the failed water pump to supply high-pressure water flow to the jet knife, so that the underwater trenching and cable laying robot using the water flow jetting mechanism of the utility model can continue to operate and temporarily does not need to be repaired, and can be returned to land for processing after the operation is completed.

[0072] 2、By arranging the control valve at the water outlet of the jet water pump, when the third jet water pump 3 replaces the failed water pump to supply water, the backflow of water flow from the water outlet of the failed water pump can be effectively reduced or avoided, and the operation efficiency of the underwater trenching and cable laying robot is ensured.

[0073] Embodiment 3

[0074] Please refer to Figure 4 、 5 The utility model provides a water flow jetting mechanism, at least including first jet water pump 1, second jet water pump 2, third jet water pump 3 and three-way joint 7;

[0075] The water outlet of the first jet water pump 1 is connected with the first control valve 11, and the first control valve 11 is connected with the first jet knife 5 through the first water outlet pipeline 12;

[0076] The outlet of the second jet water pump 2 is connected with a second control valve 21, and the second control valve 21 is connected with the second jetting cutter 6 through a second outlet pipeline 22.

[0077] The outlet of the third jet water pump 3 is connected with the fourth control valve 33 and the fifth control valve 34 through the tee joint 7, the fourth control valve 33 is communicated with the first outlet pipeline 12, and the fifth control valve 34 is communicated with the second outlet pipeline 22.

[0078] Further, the first control valve 11 and the second control valve 21 are one-way valves, the fourth control valve 33 and the fifth control valve 34 are electronic butterfly valves, the third jet water pump 3 is set to a closed state, and the fourth control valve 33 and the fifth control valve 34 are set to a normally closed state.

[0079] Understandably, when the first control valve 11 and the second control valve 21 are one-way valves, and the fourth control valve 33 and the fifth control valve 34 are electronic butterfly valves, under normal operation, the first jet water pump 1 and the second jet water pump 2 are opened, the first jet water pump 1 opens the first control valve 11 from the outlet, the water flow is transported to the first jetting cutter 5 through the first outlet pipeline 12, the second jet water pump 2 opens the second control valve 21 from the outlet, and the water flow is transported to the second jetting cutter 6 through the second outlet pipeline 22; the third jet water pump 3 is not opened, and at the same time, because the fourth control valve 33 and the fifth control valve 34 are in a closed state, the water flow cannot flow back from the third jet water pump 3.

[0080] The first jetting cutter 5 and the second jetting cutter 6 normally perform ditching operation.

[0081] Understandably, when the first jet water pump 1 fails, because of the first control valve 11, water cannot be lost from the first jet water pump 1; the third jet water pump 3 is opened, the fourth control valve 33 is switched to an open state, the third jet water pump 3 discharges water and flows to the first outlet pipeline 12 through the tee joint 7, so that the first jetting cutter 5 normally performs ditching operation, and the operation of the underwater ditching and cable laying robot is not affected. Understandably, the processing mode when the second jet water pump 2 fails is the same as when the first jet water pump 1 fails.

[0082] Understandably, when the first jet water pump 1 and the second jet water pump 2 fail, because of the first control valve 11 and the second control valve 21, water cannot be lost from the first jet water pump 1 or the second jet water pump 2; the third jet water pump 3 is opened, the fourth control valve 33 and the fifth control valve 34 are switched to an open state, the third jet water pump 3 discharges water and flows to the first outlet pipeline 12 and the second outlet pipeline 22 through the tee joint 7, so that the first jetting cutter 5 and the second jetting cutter 6 perform ditching operation under the condition of meeting the minimum working flow, and the underwater ditching and cable laying robot can continue to operate.

[0083] Therefore, the water flow injection mechanism can realize the following technical effects:

[0084] 1. When the injection water pump fails, the third injection water pump 3 replaces the failed water pump to supply high-pressure water flow to the injection knife, so that the underwater ditching and cable laying robot using the water flow injection mechanism can continue to work, and temporary maintenance is not required, and the work is completed and returned to land for processing.

[0085] 2. By using electronic butterfly valves as the fourth control valve 33 and the fifth control valve 34, by controlling the opening or closing of the fourth control valve 33 and the fifth control valve 34, different water supply pipelines can be formed, so that the water flow output by the third injection water pump is effectively transmitted to the first water outlet pipeline 12 or the second water outlet pipeline 22 corresponding to the failed water pump, avoiding the flow reduction caused by the water flow being divided.

[0086] Embodiment 4

[0087] Please refer to Figure 1 , 4 and Figure 6 , the utility model provides a kind of underwater ditching and cable laying robot 100, including burying plough main body 110 and any water flow injection mechanism as above, the water flow injection mechanism is installed on the burying plough main body 110.

[0088] When the first injection water pump 1 and the second injection water pump 2 are damaged, the third injection water pump 3 is opened, and the work efficiency is only half of normal. In one application scenario of the embodiment, the third injection water pump 3 can be provided with two simultaneously, so that the expected work efficiency can be realized when the first injection water pump 1 and the second injection water pump 2 are damaged.

[0089] The above is only preferred embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation made by using the utility model specification and drawing contents, or direct / indirect application in other related technical fields is included in the patent protection range of the utility model.

Claims

1. A water jet mechanism, characterized by, At least comprising a first jet water pump (1), a second jet water pump (2), a third jet water pump (3) and a water tank (4); The water outlet of the first jet water pump (1) is connected with a first control valve (11), and the first control valve (11) is communicated with the water tank (4) through a first water outlet pipeline (12); The water outlet of the second jet water pump (2) is connected with a second control valve (21), and the second control valve (21) is connected with the water tank (4) through a second water outlet pipeline (22); The water outlet of the third jet water pump (3) is connected with a third control valve (31), and the third control valve (31) is connected with the water tank (4) through a third water outlet pipeline (32); The water outlet of the water tank (4) is communicated with a first jet knife (5) and a second jet knife (6) respectively.

2. The water stream projection mechanism of claim 1, wherein The first control valve (11), the second control valve (21) and the third control valve (31) are one-way valves.

3. The water stream projection mechanism of claim 2, wherein The third jet water pump (3) is set to be in a closed state; The third jet water pump (3) is configured to start when at least one of the first jet water pump (1) and the second jet water pump (2) fails.

4. The water stream projection mechanism of claim 1, wherein The first control valve (11), the second control valve (21) and the third control valve (31) are electronic butterfly valves.

5. The water stream projection mechanism of claim 4, wherein The first control valve (11) and the second control valve (21) are set to be in an open state, and the third control valve (31) is set to be in a closed state.

6. The water stream projection mechanism of claim 5, wherein The third jet water pump (3) is set to be in a closed state; the third jet water pump (3), the first control valve (11), the second control valve (21) and the third control valve (31) are configured to: When the first jet water pump (1) fails, the first control valve (11) is switched to a closed state, the third control valve (31) is switched to an open state, and the third jet water pump (3) is started; Or, when the second jet water pump (2) fails, the second control valve (21) is switched to a closed state, the third control valve (31) is switched to an open state, and the third jet water pump (3) is started; Or, when the first jet water pump (1) and the second jet water pump (2) fail, the first control valve (11) and the second control valve (21) are switched to a closed state, the third control valve (31) is switched to an open state, and the third jet water pump (3) is started.

7. A water jet mechanism characterized by, At least comprising a first jet water pump (1), a second jet water pump (2), a third jet water pump (3) and a three-way joint (7); The water outlet of the first jet water pump (1) is connected with a first control valve (11), and the first control valve (11) is connected with a first jet knife (5) through a first water outlet pipeline (12); The water outlet of the second jet water pump (2) is connected with a second control valve (21), and the second control valve (21) is connected with a second jet knife (6) through a second water outlet pipeline (22); The water outlet of the third jet water pump (3) is connected with the fourth control valve (33) and the fifth control valve (34) through the three-way joint (7), the fourth control valve (33) is communicated with the first water outlet pipeline (12), and the fifth control valve (34) is communicated with the second water outlet pipeline (22).

8. The water stream projection mechanism of claim 7, wherein The first control valve (11) and the second control valve (21) are one-way valves. The fourth control valve (33) and the fifth control valve (34) are electronic butterfly valves.

9. The water stream projection mechanism of claim 8, wherein The third jet water pump (3) is set to a closed state, and the fourth control valve (33) and the fifth control valve (34) are set to a normally closed state. The third jet water pump (3) and the fourth control valve (33) are configured such that when the first jet water pump (1) fails, the fourth control valve (33) is switched to a communication state, and the third jet water pump (3) is started. Alternatively, the third jet water pump (3) and the fifth control valve (34) are configured such that when the second jet water pump (2) fails, the fifth control valve (34) is switched to a communication state, and the third jet water pump (3) is started. Alternatively, the third jet water pump (3), the fourth control valve (33) and the fifth control valve (34) are configured such that when the first jet water pump (1) and the second jet water pump (2) fail, the fourth control valve (33) and the fifth control valve (34) are switched to a communication state, and the third jet water pump (3) is started.

10. An underwater trenching and cabling robot (100) characterized in that, The buried plough body (110) and the water flow jetting mechanism as claimed in any one of claims 1-9 are included, and the water flow jetting mechanism is installed on the buried plough body (110).

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