A hydraulic system for a cutter suction dredger featuring potential energy recovery, intelligent monitoring, and leakage protection.

Abstract

The application provides a kind of hydraulic system of cutter suction dredger with potential energy recovery, intelligent monitoring and leakage protection, including hydraulic oil tank, reamer system, horizontal moving system, bridge and steel pile trolley system, emergency pump system, bridge winch motor and potential energy recovery system, hydraulic oil tank is connected with reamer system, horizontal moving system, bridge and steel pile trolley system, emergency pump system, potential energy recovery system respectively;Potential energy recovery system includes accumulator pressure storage system, accumulator overhaul protection system and accumulator working system.The potential energy recovery system provided by the application recovers potential energy when the bridge of cutter suction dredger is lowered, converts gravitational potential energy into pressure energy of accumulator and stores it up, further improves the storage pressure through pressure increasing device, stores it in high-pressure accumulator, and finally high-pressure accumulator replaces motor pump set to provide energy for bridge lifting action, reducing energy consumption.

Description

Technical Field

[0001] This invention belongs to the field of potential energy recovery and monitoring and protection technology, and in particular relates to a hydraulic system for a cutter suction dredger with potential energy recovery, intelligent monitoring and leakage protection. Background Technology

[0002] A cutter suction dredger uses a rotating cutter head to loosen the soil on the riverbed or seabed, mixing the soil with water to form a slurry. This slurry is then sucked into the pump body through the suction pipe and transported to the discharge area through the discharge pipe. During operation, dredging, conveying, and unloading are all completed in one integrated process, resulting in high production efficiency. Because hydraulic systems offer advantages such as high gear ratios, easy control of linear motion, self-lubrication, and good heat dissipation, many components of a cutter suction dredger are hydraulically driven.

[0003] The hydraulic systems of cutter suction dredgers, both domestically and internationally, have become increasingly mature after years of development and improvement. However, some shortcomings still exist in energy conservation, environmental protection, online monitoring, and safety protection. For example... Figure 1 As shown, the current hydraulic systems of cutter suction dredgers lack several key issues: 1. They lack an energy recovery system. The potential energy released from the bridge is dissipated as heat by the system's balance valves, causing the oil to heat up. This energy loss negatively impacts system performance. 2. Current cutter suction dredger hydraulic systems lack online monitoring of critical hydraulic components such as pumps and motors. Damage to these components is only detected when they become unusable. This not only contaminates the hydraulic system and damages other components, but also leads to downtime and project delays, resulting in greater economic losses. 3. Current cutter suction dredger hydraulic systems lack leak protection. Due to the large size of the system, leaks in concealed compartments or underwater can lead to significant oil spills if not detected promptly, polluting the environment and increasing cleanup workload. Fourth, the current hydraulic system of cutter suction dredgers does not have an emergency function in case of oil leakage. Since the return oil lines and drain oil lines of each actuator are connected separately, when an actuator system leaks oil, if other actuators need to be activated urgently, hydraulic oil will flow back to the leak point from the return oil main, causing a large amount of oil leakage. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention aims to propose a hydraulic system for cutter suction dredgers with potential energy recovery, intelligent monitoring, and leakage protection. This hydraulic system solves the problems of existing cutter suction dredger hydraulic systems lacking energy recovery systems, oil leakage protection, and online monitoring of important hydraulic components such as hydraulic pumps and hydraulic motors.

[0005] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0006] A hydraulic system for a cutter suction dredger with potential energy recovery, intelligent monitoring, and leakage protection includes a hydraulic oil tank, a cutter system, a lateral movement system, a bridge lifting and steel pile trolley system, an emergency pump system, and a bridge lifting winch motor. The hydraulic oil tank is connected to the cutter system, the lateral movement system, the bridge lifting and steel pile trolley system, the emergency pump system, and the potential energy recovery system. The system also includes a potential energy recovery system connected to both the bridge lifting and steel pile trolley system and the hydraulic oil tank. The potential energy recovery system comprises an accumulator storage system, an accumulator maintenance and protection system, and an accumulator operating system.

[0007] The accumulator storage system includes a potential energy recovery oil tank. The potential energy recovery oil tank, shut-off valve five, two-position solenoid valve ten, oil inlet E port when the bridge hoisting winch motor releases the cable, oil outlet F port when the bridge hoisting winch motor releases the cable, two-position solenoid valve four, and one-way valve six are connected in sequence to form the oil outlet pipeline of the potential energy recovery oil tank.

[0008] The outlet of the one-way valve six is ​​sequentially connected to the one-way throttle valve group one, the shut-off valve six, and the low-pressure accumulator to form a low-pressure accumulator oil circuit; the low-pressure accumulator, the shut-off valve six, the one-way throttle valve group one, the two-position solenoid valve five, the one-way valve twelve, and the brake cylinder of the bridge hoisting winch motor are sequentially connected to form a low-pressure working oil circuit.

[0009] The other outlet of the one-way valve six is ​​sequentially connected to the sequence valve, the two-position solenoid valve six, the booster cylinder, the one-way throttle valve group two, the shut-off valve eight, and the high-pressure accumulator to form a high-pressure accumulator oil circuit; the high-pressure accumulator, the shut-off valve eight, the one-way throttle valve group two, the two-position solenoid valve seven, and the one-way valve seven are sequentially connected to the oil inlet F port of the bridge hoisting winch motor to form a high-pressure working oil circuit;

[0010] The low-pressure accumulator and the high-pressure accumulator are respectively connected to the potential energy recovery tank through the accumulator maintenance and protection system, and the return oil pipeline of the booster cylinder is connected to the potential energy recovery tank.

[0011] Furthermore, the accumulator maintenance and protection system includes shut-off valve seven, shut-off valve nine, overflow valve five, and overflow valve six. Shut-off valve seven and overflow valve five are connected in parallel on the pipeline between shut-off valve six and the low-pressure accumulator. The outlets of shut-off valve seven and overflow valve five are both connected to the potential energy recovery tank through return oil pipeline eight. Shut-off valve nine and overflow valve six are connected in parallel on the pipeline between shut-off valve eight and the high-pressure accumulator. The outlets of shut-off valve nine and overflow valve six are both connected to the potential energy recovery tank through return oil pipeline nine.

[0012] Furthermore, the accumulator operating system includes pressure sensor 10, pressure sensor 11, pressure sensor 12, and pressure sensor 13. Pressure sensor 10 and pressure sensor 11 are connected in parallel on the pipeline between shut-off valve 6 and the low-pressure accumulator; pressure sensor 12 and pressure sensor 13 are connected in parallel on the pipeline between shut-off valve 8 and the high-pressure accumulator.

[0013] Furthermore, the bridge lifting and steel pile trolley system also includes a bridge lifting and steel pile trolley pump unit. The inlet of the bridge lifting and steel pile trolley pump unit is connected to the hydraulic oil tank, and the outlet of the bridge lifting and steel pile trolley pump unit is connected to the oil inlet P of the overflow valve three, the oil inlet P of the three-position solenoid directional valve three, the oil inlet P of the steel pile lifting cylinder, and the oil inlet P of the three-position solenoid directional valve five, respectively. The overflow valve three is connected to the hydraulic oil tank through the return oil pipeline six.

[0014] Furthermore, the oil outlet A port of the three-position electromagnetic directional valve three is sequentially connected to the balance valve group, the two-position electromagnetic valve four, the pressure sensor five, and the oil inlet F port of the bridge hoisting winch motor during hoisting; the oil outlet B port of the three-position electromagnetic directional valve three is sequentially connected to the pressure sensor six and the oil return port E port of the bridge hoisting winch motor during hoisting; the oil return port T port of the three-position electromagnetic directional valve three is connected to the hydraulic oil tank through the oil return pipeline three.

[0015] Furthermore, the leakage port of the bridge lifting and steel pile trolley pump unit is sequentially connected to temperature sensor three, flow meter three, and filter with metal detection three, and the filter with metal detection three is connected to the hydraulic oil tank.

[0016] Furthermore, the leakage port of the bridge hoisting winch motor, temperature sensor 6, flow meter 6, and metal detector filter 6 are connected in sequence, and the metal detector filter 6 is connected to the hydraulic oil tank through the drain pipe 3.

[0017] Furthermore, the accumulator pressure storage system also includes a two-position solenoid valve eight, which is connected in parallel with a three-position solenoid directional valve three. The hydraulic oil tank, the shut-off valve three, the bridge lifting and steel pile trolley pump group, the check valve three, the pressure sensor sixteen, the two-position solenoid valve eight, the check valve five, and the potential energy recovery oil tank are sequentially connected to form the potential energy recovery oil tank replenishment pipeline.

[0018] Furthermore, the potential energy recovery tank is equipped with a low-level liquid level switch and a high-level liquid level switch.

[0019] Furthermore, the emergency pump system includes an emergency hydraulic pump. The inlet of the emergency hydraulic pump is connected to the hydraulic oil tank via a shut-off valve four. The outlet of the emergency hydraulic pump is connected to an overflow valve four, a two-position solenoid valve one, a two-position solenoid valve two, and a three-position solenoid valve three via a check valve four. The overflow valve four is connected to the hydraulic oil tank via a return oil line seven. The outlets of two-position solenoid valve one, two-position solenoid valve two, and three-position solenoid valve three are respectively connected to the cutterhead system, the lateral movement system, the bridge lifting system, and the steel pile trolley system.

[0020] Compared with existing technologies, the hydraulic system for cutter suction dredgers with potential energy recovery, intelligent monitoring, and leakage protection described in this invention has the following advantages:

[0021] (1) The potential energy recovery system provided by the present invention utilizes the bridge frame of the cutter suction dredger to recover potential energy during the lowering action, converting the gravitational potential energy into the pressure energy of the accumulator and storing it. The storage pressure is further increased by the pressurization device and stored in the high-pressure accumulator. Finally, the high-pressure accumulator replaces the motor pump set to provide energy to perform the bridge lifting action, reducing energy consumption.

[0022] (2) The hydraulic system provided by the present invention collects and monitors data such as flow rate, temperature and metal detection for important components such as hydraulic pumps and motors, thereby determining the wear degree and remaining service life of hydraulic pumps and motors, and making a spare parts plan accordingly, so as to avoid component damage affecting system safety and project progress.

[0023] (3) The hydraulic system provided by the present invention has an oil leakage protection function. Even if a leak occurs in a concealed compartment or underwater, the system will automatically stop the mechanism and shut down the current hydraulic pump source to reduce oil leakage because the pressure sensors at both ends of the actuator suddenly drop below the set pressure value.

[0024] (4) The hydraulic system provided by the present invention has an emergency function in case of oil leakage. Since the cutter system, the transverse system, the bridge lifting and steel pile trolley system have their own return oil pipelines and drain oil pipelines, when an actuator system leaks oil, other actuators need to be activated urgently, so that the hydraulic oil will not flow back to the leaking point from the return oil main pipe, which protects the environment and improves the safety of the ship. Attached Figure Description

[0025] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0026] Figure 1 This is a hydraulic schematic diagram of an existing cutter suction dredger.

[0027] Figure 2This is a hydraulic schematic diagram of the cutter suction dredger provided in an embodiment of the present invention;

[0028] Figure 3 This is a hydraulic schematic diagram of the potential energy recovery system provided in an embodiment of the present invention.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1.1 Hydraulic oil tank; 1.2 Potential energy recovery oil tank; 2.1 Cutter pump set; 2.2 Lateral movement pump set; 2.3 Bridge lifting and steel pile trolley pump set; 2.4 Emergency hydraulic pump; 3.1 Check valve one; 3.2 Check valve two; 3.3 Check valve three; 3.4 Check valve four; 3.5 Check valve five; 3.6 Check valve six; 3.7 Check valve seven; 3.8 Check valve eight; 3.9 Check valve nine; 3.10 Check valve ten; 3.11 Check valve eleven; 3.12 Check valve twelve; 4.1 Relief valve one; 4.2 Relief valve two; 4.3 Relief valve three; 4.4 Relief valve four; 4.5 Relief valve five; 4.6 Relief valve six; 4.7 Sequence valve; 4.8 Pressure reducing valve; 4.9 Balance valve assembly; 5.1 Flowmeter 1; 5.2 Flowmeter 2; 5.3 Flowmeter 3; 5.4 Flowmeter 4; 5.5 Flowmeter 5; 5.6 Flowmeter 6; 6.1 Three-position solenoid directional valve 1; 6.2 Three-position solenoid directional valve 2; 6.3 Three-position solenoid directional valve 3; 6.4 Three-position solenoid directional valve 4; 6.5 Three-position solenoid directional valve 5; 7.1 Shut-off valve 1; 7.2 Shut-off valve 2; 7.3 Shut-off valve 3; 7.4 Shut-off valve 4; 7.5 Shut-off valve 5; 7.6 Shut-off valve 6; 7.7 Shut-off valve 7; 7.8 Shut-off valve 8; 7.9 Shut-off valve 9; 8.1 Pressure sensor 1; 8.2 Pressure sensor 2; 8.3 Pressure sensor 3; 8.4 Pressure sensor 4; 8.5 Pressure sensor five; 8.6 Pressure sensor six; 8.7 Pressure sensor seven; 8.8 Pressure sensor eight; 8.9 Pressure sensor nine; 8.10 Pressure sensor ten; 8.11 Pressure sensor eleven; 8.12 Pressure sensor twelve; 8.13 Pressure sensor thirteen; 8.14 Pressure sensor fourteen; 8.15 Pressure sensor fifteen; 8.16 Pressure sensor sixteen; 9.1 Cutter motor; 9.2 Transverse winch motor; 9.3 Bridge lifting winch motor; 9.4 Trolley cylinder; 9.5 Steel pile lifting cylinder; 10.1 Two-position solenoid valve one; 10.2 Two-position solenoid valve two; 10.3 Two-position solenoid valve three; 10.4 Two-position solenoid valve four; 10.5 Two-position solenoid valve four; 10.6 Two-position solenoid valve; 10.7 Two-position solenoid valve; 10.8 Two-position solenoid valve; 10.9 Two-position solenoid valve; 10.10 Two-position solenoid valve; 11.1 Return oil check valve; 11.2 Return oil check valve; 11.3 Return oil check valve; 12.1 Filter with metal detection; 12.2 Filter with metal detection; 12.3 Filter with metal detection; 12.4 Filter with metal detection; 12.5 Filter with metal detection; 12.6 Filter with metal detection; 13.1 Temperature sensor; 13.2 Temperature sensor; 13.3 Temperature sensor; 13.4 Temperature sensor; 13.5 Temperature sensor; 13.6. Temperature sensor six; 14.1 Low-pressure accumulator; 14.2 High-pressure accumulator; 15.1 One-way throttle valve assembly one; 15.2 One-way throttle valve assembly two; 16. Booster cylinder; 17.1 Limit switch one; 17.2 Limit switch two; 18.1 Low-level liquid switch; 18.2 High-level liquid switch. Detailed Implementation

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0032] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0033] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] like Figure 2 and Figure 3As shown, a hydraulic system for a cutter suction dredger with potential energy recovery, intelligent monitoring, and leakage protection includes a hydraulic oil tank 1.1, a cutter head system, a lateral movement system, a bridge lifting and steel pile trolley system, an emergency pump system, and a potential energy recovery system. The hydraulic oil tank 1.1 is connected to the cutter head system, the lateral movement system, the bridge lifting and steel pile trolley system, the emergency pump system, and the potential energy recovery system. The bridge lifting and steel pile trolley system includes a bridge lifting winch motor 9.3. The potential energy recovery system includes an accumulator storage system, an accumulator maintenance and protection system, and an accumulator working system.

[0036] The accumulator storage system includes a potential energy recovery tank 1.2. The potential energy recovery tank 1.2, shut-off valve 7.5, two-position solenoid valve 10.10, oil inlet E port of the bridge hoisting winch motor 9.3 when the cable is being released, oil outlet F port of the bridge hoisting winch motor 9.3 when the cable is being released, two-position solenoid valve 10.4, and one-way valve 3.6 are connected in sequence to form the oil outlet pipeline of the potential energy recovery tank.

[0037] The outlet of the one-way valve 6 3.6 is sequentially connected to the one-way throttle valve group 1 15.1, the shut-off valve 6 7.6, and the low-pressure accumulator 14.1 to form a low-pressure accumulator oil circuit; the low-pressure accumulator 14.1, the shut-off valve 6 7.6, the one-way throttle valve group 1 15.1, the two-position solenoid valve 5 10.5, the one-way valve 12 3.12, and the brake cylinder of the bridge hoisting winch motor 9.3 are sequentially connected to form a low-pressure working oil circuit;

[0038] The outlet on the other side of the one-way valve 3.6 is sequentially connected to the sequence valve 4.7, the two-position solenoid valve 10.6, the booster cylinder 16, the one-way throttle valve group 15.2, the shut-off valve 7.8, and the high-pressure accumulator 14.2 to form a high-pressure accumulator oil circuit; the high-pressure accumulator 14.2, the shut-off valve 7.8, the one-way throttle valve group 15.2, the two-position solenoid valve 10.7, and the one-way valve 3.7 are sequentially connected to the oil inlet F port of the bridge hoisting winch motor 9.3 during hoisting to form a high-pressure working oil circuit;

[0039] The low-pressure accumulator 14.1 and the high-pressure accumulator 14.2 are respectively connected to the potential energy recovery tank 1.2 through the accumulator maintenance and protection system, and the return oil pipeline T10 of the booster cylinder 16 is connected to the potential energy recovery tank 1.2.

[0040] In a preferred embodiment of the present invention, the accumulator maintenance and protection system includes a shut-off valve 7.7, a shut-off valve 7.9, an overflow valve 4.5, and an overflow valve 4.6. The shut-off valve 7.7 and the overflow valve 4.5 are connected in parallel on the pipeline between the shut-off valve 7.6 and the low-pressure accumulator 14.1. The outlets of the shut-off valve 7.7 and the overflow valve 4.5 are both connected to the potential energy recovery tank 1.2 through the return oil pipeline 8T8. The shut-off valve 7.9 and the overflow valve 4.6 are connected in parallel on the pipeline between the shut-off valve 87.8 and the high-pressure accumulator 14.2. The outlets of the shut-off valve 7.9 and the overflow valve 4.6 are both connected to the potential energy recovery tank 1.2 through the return oil pipeline 9T9.

[0041] In a preferred embodiment of the present invention, the accumulator operating system includes pressure sensor 8.10, pressure sensor 8.11, pressure sensor 8.12, and pressure sensor 8.13. Pressure sensor 8.10 and pressure sensor 8.11 are connected in parallel on the pipeline between shut-off valve 7.6 and low-pressure accumulator 14.1; pressure sensor 8.12 and pressure sensor 8.13 are connected in parallel on the pipeline between shut-off valve 7.8 and high-pressure accumulator 14.2.

[0042] In a preferred embodiment of the present invention, the bridge lifting and steel pile trolley system further includes a bridge lifting and steel pile trolley pump unit 2.3. The inlet of the bridge lifting and steel pile trolley pump unit 2.3 is connected to the hydraulic oil tank 1.1 through a shut-off valve 7.3. The outlet P3 of the bridge lifting and steel pile trolley pump unit 2.3 is sequentially connected to a check valve 3.3, a pressure sensor 8.16, and then connected to an overflow valve 4.3, a three-position solenoid directional valve 6.3 inlet P, a steel pile lifting cylinder 9.5 inlet P, and a three-position solenoid directional valve 6.5 inlet P. The overflow valve 4.3 is connected to the hydraulic oil tank 1.1 through a return oil pipeline T6.

[0043] In a preferred embodiment of the present invention, the oil outlet A port of the three-position electromagnetic directional valve 6.3 is sequentially connected to the balance valve group 4.9, the two-position electromagnetic valve 10.4, the pressure sensor 8.5, and the oil inlet F port of the bridge hoisting winch motor 9.3 during hoisting; the oil outlet B port of the three-position electromagnetic directional valve 6.3 is sequentially connected to the pressure sensor 8.6 and the oil return E port of the bridge hoisting winch motor 9.3 during hoisting; the outlet A and B ports of the three-position electromagnetic directional valve 6.4 are connected to the trolley cylinder 9.4 through the pressure sensor 8.7 and the pressure sensor 8.8, respectively; the outlet A port of the three-position electromagnetic directional valve 6.5 is connected to the steel pile hoisting cylinder 9.5 through the pressure sensor 8.9; the oil return T ports of the three-position electromagnetic directional valves 6.3, 6.5, and 6.4 are all connected to the hydraulic oil tank 1.1 through the oil return pipeline 3T3.

[0044] In a preferred embodiment of the present invention, the leakage port of the bridge hoisting winch motor 9.3, the temperature sensor 13.6, the flow meter 5.6, and the metal detector filter 12.6 are connected in sequence, and the metal detector filter 12.6 is connected to the hydraulic oil tank 1.1 through the drain pipe 3L3.

[0045] In a preferred embodiment of the present invention, the accumulator pressure storage system further includes a two-position solenoid valve 10.8, which is connected in parallel with a three-position solenoid directional valve 6.3. The two-position solenoid valve 10.8 is connected to the potential energy recovery tank 1.2 through a one-way valve 3.5. The hydraulic oil tank 1.1, the shut-off valve 7.3, the bridge lifting and steel pile trolley pump group 2.3, the one-way valve 3.3, the pressure sensor 8.16, the two-position solenoid valve 10.8, the one-way valve 3.5, and the potential energy recovery tank 1.2 are sequentially connected to form the oil replenishment pipeline of the potential energy recovery tank 1.2.

[0046] In a preferred embodiment of the present invention, a low-level liquid level switch 18.1 and a high-level liquid level switch 18.2 are installed on the potential energy recovery tank 1.2.

[0047] In a preferred embodiment of the present invention, the auger system includes an auger hydraulic pump 2.1. The inlet of the auger hydraulic pump 2.1 is connected to the hydraulic oil tank 1.1 via a shut-off valve 7.1. The outlet P1 of the auger hydraulic pump 2.1 is sequentially connected to a check valve 3.1 and a pressure sensor 8.14, and then connected to the inlet P port of an overflow valve 4.1 and a three-position solenoid directional valve 6.1, respectively. The overflow valve 4.1 is connected to the hydraulic oil tank 1.1 via a return oil line T4. The outlets A and B of the three-position solenoid directional valve 6.1 are connected to the auger motor 9.1 via a pressure sensor 8.1 and a pressure sensor 8.2, respectively. The return port T of the three-position solenoid directional valve 6.1 is connected to the hydraulic oil tank 1.1 via a return oil line T1.

[0048] The oil leakage port of the cutter motor 9.1, the temperature sensor 13.4, the flow meter 5.4, and the filter with metal detector 12.4 are connected in sequence. The filter with metal detector 12.4 is connected to the hydraulic oil tank 1.1 through the drain pipe L1.

[0049] In a preferred embodiment of the present invention, the traverse system includes a traverse pump assembly 2.2. The inlet of the traverse pump assembly 2.2 is connected to the hydraulic oil tank 1.1 via a shut-off valve 7.2. The outlet P2 of the traverse pump assembly 2.2 is sequentially connected to a check valve 3.2 and a pressure sensor 8.15, and then connected to the inlet P port of an overflow valve 4.2 and a three-position solenoid directional valve 6.2, respectively. The overflow valve 4.2 is connected to the hydraulic oil tank 1.1 via a return oil pipeline T5. The outlets A and B of the three-position solenoid directional valve 6.2 are connected to the traverse winch motor 9.2 via pressure sensors 8.3 and 8.4, respectively. The return oil port of the three-position solenoid directional valve 6.2 is connected to the hydraulic oil tank 1.1 via a return oil pipeline T2, and a return oil check valve 11.2 is provided on the return oil pipeline T2.

[0050] The leakage port of the transverse winch motor 9.2, temperature sensor 13.5, flow meter 5.5, and metal detector filter 12.5 are connected in sequence. The metal detector filter 12.5 is connected to the hydraulic oil tank 1.1 through the drain pipe L2.

[0051] In a preferred embodiment of the present invention, the emergency pump system includes an emergency hydraulic pump 2.4. The inlet of the emergency hydraulic pump 2.4 is connected to the hydraulic oil tank 1.1 via a shut-off valve 7.4. The outlet P4 of the emergency hydraulic pump 2.4 is connected to an overflow valve 4.4, a two-position solenoid valve 10.1, a two-position solenoid valve 20.2, and a two-position solenoid valve 30.3 via a check valve 3.4. The overflow valve 4.4 is connected to the hydraulic oil tank 1.1 via a return oil pipeline T7. The outlet Y1 of the two-position solenoid valve 10.1, the outlet Y2 of the two-position solenoid valve 20.2, and the outlet Y3 of the two-position solenoid valve 30.3 are respectively connected to the cutterhead system, the lateral movement system, the bridge lifting system, and the steel pile trolley system.

[0052] In a preferred embodiment of the present invention, the leakage port of the cutter hydraulic pump 2.1 is sequentially connected to a temperature sensor 13.1, a flow meter 5.1, and a filter with a metal detector 12.1, and the filter with a metal detector 12.1 is connected to the hydraulic oil tank 1.1.

[0053] The leakage port of the transverse pump unit 2.2 is sequentially connected to a temperature sensor 13.2, a flow meter 5.2, and a filter with metal detection 12.2. The filter with metal detection 12.2 is connected to the hydraulic oil tank 1.1.

[0054] The leakage port of the bridge lifting and steel pile trolley pump unit 2.3 is sequentially connected to temperature sensor 3.3, flow meter 3.5.3, and filter with metal detection 3.3. The filter with metal detection 3.12.3 is connected to hydraulic oil tank 1.1.

[0055] The working principles of the various systems provided by this invention are as follows:

[0056] I. Potential Energy Recovery System

[0057] 1. Existing technology: instructions for the operation of lowering the cable tray

[0058] like Figure 1 As shown in the schematic diagram of the hydraulic system of an existing cutter suction dredger without a potential energy recovery system, when the dredger's bridge frame is lowered, hydraulic oil is discharged from the hydraulic oil tank 1.1, passes through the shut-off valve 7.3, enters the bridge lifting and steel pile trolley pump group 2.3, and then enters the inlet P port of the three-position solenoid directional valve 6.3 after passing through the one-way valve 3.3. At this time, the left position of the three-position solenoid directional valve 6.3 is energized, and the P port of the three-position solenoid directional valve 6.3 is connected to the B port, discharging oil into the E port of the bridge lifting winch motor 9.3. After passing through the bridge lifting winch motor 9.3, the oil enters the F port as the bridge frame descends, and then enters the A port of the three-position solenoid directional valve 6.3 through the balance valve 4.9. The A port is connected to the T port, discharging oil into the return oil pipe T3. The return oil returns to the hydraulic oil tank 1.1 after passing through the return oil one-way valve 11.1 on the return oil pipe T.

[0059] 2. Working principle of the accumulator storage system in the potential energy recovery system

[0060] like Figure 2 and Figure 3 The diagram shown is a hydraulic schematic diagram of the cutter suction dredger and a hydraulic schematic diagram of the potential energy recovery system provided in the embodiment of the present invention. When the system is in use, a "pressure storage" button is provided on the control panel. When this button is pressed, and the dredger bridge is lowered, the bridge lifting winch motor 9.3 is driven by the weight of the bridge. At this time, the bridge lifting winch motor 9.3 is equivalent to the hydraulic pump operation.

[0061] Hydraulic oil flows out from potential energy recovery tank 1.2 (to ensure oil suction effect, the installation position of potential energy recovery tank 1.2 should be higher than the bridge hoisting winch motor 9.3). The oil passes through shut-off valve 7.5 and two-position solenoid valve 10.10 in sequence. Under the control of PLC (programmable logic controller), the left position of two-position solenoid valve 10.10 is energized. The P port of two-position solenoid valve 10.10 is connected to the A port, and the oil enters the E port next to the bridge hoisting winch motor 9.3.

[0062] As the bridge descends, the hydraulic fluid is discharged from port F next to the winch motor 9.3. At this time, the PLC (Programmable Logic Controller) energizes the left position of the two-position solenoid valve 10.4, connecting port P and port B. The hydraulic fluid is discharged from port B and then enters check valve 3.6. After being discharged from check valve 3.6, part of the hydraulic fluid passes sequentially through one-way throttle valve group 15.1 and shut-off valve 7.6, then enters low-pressure accumulator 14.1 for low-pressure accumulation. The other part of the hydraulic fluid passes through sequence valve 4.7 (set to a pressure of 11 MPa; it opens when the hydraulic pressure reaches 11 MPa) and enters two-position solenoid valve 10.6. At this time, two-position solenoid valve 10.6 is not energized and remains in the left position under the action of spring force. Port P of two-position solenoid valve 10.6 is connected to port A. The hydraulic fluid is discharged from port A, and part of it enters... One part enters chamber a of the booster cylinder 16, and the other part enters chamber c of the booster cylinder 16 through check valve 3.10, and simultaneously reaches the inlet of check valve 3.8. Due to the high discharge pressure of the symmetrically arranged check valve 3.9, check valve 3.8 is closed. At this time, the piston of the booster cylinder 16 moves to the right under the pressure of the oil in chambers a and c. The oil in chamber b is pushed out by the piston of the booster cylinder 16 to port B of the two-position solenoid valve 10.6. Port B is connected to port T. The oil is discharged from port T and flows through T10 to the potential energy recovery tank 1.2. The oil in chamber d is pushed out by the piston of the booster cylinder 16 to check valve 3.9, and then discharged from check valve 3.9 in sequence through the single-phase throttle valve group 15.2, the shut-off valve 7.8, and the high-pressure accumulator 14.2, until the piston of the booster cylinder 16 moves to the rightmost end and contacts the limit switch 17.1.

[0063] Limit switch 17.1 sends a signal to the PLC (Programmable Logic Controller) to energize two-position solenoid valve 10.6. At this time, under the action of electromagnetic force, two-position solenoid valve 10.6 moves to the right position, and its P port connects with its B port. Oil is discharged from port B; part enters chamber b of booster cylinder 16, and the other part enters chamber d of booster cylinder 16 through check valve 3.11, simultaneously reaching the inlet of check valve 3.9. At this time, the piston of booster cylinder 16 is pushed by the pressure oil in chambers b and d... Moving to the left, the oil in chamber a is pushed out by the piston of the booster cylinder 16 to port A of the two-position solenoid valve 10.6. Port A is connected to port T. The oil flows out from port T and through T10 to the potential energy recovery tank 1.2. The oil in chamber c is pushed out by the piston of the booster cylinder 16 to the one-way valve 3.8. Then, it is discharged from the one-way valve 3.8 and passes through the one-way throttle valve group 15.2, the shut-off valve 7.8, and the high-voltage accumulator 14.2 in sequence until the piston of the booster cylinder 16 moves to the leftmost end and contacts the limit switch 17.2.

[0064] Limit switch 2 17.2 sends a signal to the PLC (Programmable Logic Controller) to de-energize two-position solenoid valve 6 10.6, causing the piston of booster cylinder 16 to move to the right again. This process repeats continuously, continuously boosting the pressure of high-pressure accumulator 14.2. When the pressure reaches the set pressure value of 33MPa of pressure sensor 13 8.13, high-pressure accumulator 14.2 completes pressure accumulation. Pressure sensor 13 8.13 sends a signal to the PLC (Programmable Logic Controller) to de-energize two-position solenoid valve 4 10.4. The P port of two-position solenoid valve 4 10.4 is connected to the A port, and the oil is discharged from the A port. Then, through the balance valve 4.9, it enters the A port of three-position solenoid directional valve 3 6.3. The A port is connected to the T port, and the discharged oil enters the return oil pipe T3 for normal descent. At the same time, the operation panel automatically prompts "Pressure accumulation complete".

[0065] The annular cross-sectional area of ​​chamber a and chamber b of the booster cylinder 16 is X2 (i.e., the area of ​​the space where the oil finally fills chamber a or chamber b), and the circular cross-sectional area of ​​chamber c and chamber d is X1. The structural design of the booster cylinder 16 is X2 = 2X1. When it moves to the right (the same applies to the left), the pressure of chamber a and chamber c is set to P1, the pressure of chamber d is set to P2, and the pressure oil in chamber b is directly connected to the oil tank, so the pressure is zero. Then the force formula is P1X1 + P1X2 = P2X1, that is, P2 = 3P1, which can be tripled. When P1 = 11MPa, P2 = 33MPa.

[0066] 3. Working principle of the accumulator maintenance and protection system in the potential energy recovery system

[0067] The protection function refers to the safety overflow function of relief valve 5.4.5 and relief valve 6.4.6, which are set with pressure values ​​of 12MPa and 34MPa respectively. When the pressure at the bottom of the accumulator reaches this set value due to hydraulic shock or other reasons, the oil will push open the valve cores of relief valve 5.4.5 and relief valve 6.4.6, and the oil will flow to the potential energy recovery tank 1.2 through T8 and T9 respectively, to prevent the accumulator and pipeline from being damaged by excessive pressure.

[0068] The maintenance function refers to the process of first closing shut-off valve 7.6 or shut-off valve 7.8 to disconnect the low-pressure accumulator 14.1 or high-pressure accumulator 14.2 from the system when maintenance is required for the low-pressure accumulator 14.1 or high-pressure accumulator 14.2, and then opening shut-off valve 7.7 or shut-off valve 9.9 to release the pressure of the low-pressure accumulator 14.1 or high-pressure accumulator 14.2 so that the accumulator can be disassembled and inspected.

[0069] 4. Working principle of the energy storage system in the potential energy recovery system

[0070] The energy stored in low-pressure accumulator 14.1 is used to open the brake of the bridge hoisting winch motor 9.3, while the energy stored in high-pressure accumulator 14.2 is used to provide power during bridge hoisting. When the "Bridge Hoisting" button is pressed on the control panel, the system PLC (Programmable Logic Controller) first determines the pressure value based on pressure sensor +8.10 and pressure sensor +8.12. If the pressure value of pressure sensor +8.10 is greater than 3MPa and the pressure value of pressure sensor +8.12 is greater than 11MPa, the energy recovered from low-pressure accumulator 14.1 and high-pressure accumulator 14.2 is used for the bridge hoisting operation.

[0071] At this time, the bridge lifting and steel pile trolley pump group 2.3 is not working. The low-pressure accumulator 14.1 releases oil through the shut-off valve 6 7.6, the one-way throttle valve group 1 15.1, and the two-position solenoid valve 5 10.5 in sequence. At this time, the PLC (programmable logic controller) controls the two-position solenoid valve 5 10.5 to be energized. Under the action of electromagnetic force, the two-position solenoid valve 5 10.5 maintains the left position. The P port of the two-position solenoid valve 5 10.5 is connected to the A port. The oil is discharged from the A port and then enters the brake cylinder of the bridge lifting winch motor 9.3 through the one-way valve 12 3.12, opening the brake.

[0072] Simultaneously, the high-pressure accumulator 14.2 releases oil sequentially through the shut-off valve 7.8, the one-way throttle valve group 15.2, and the two-position solenoid valve 10.7. At this time, the PLC (programmable logic controller) controls the two-position solenoid valve 10.7 to be energized. Under the action of electromagnetic force, the two-position solenoid valve 10.7 remains in the left position, and the P port of the two-position solenoid valve 10.7 is connected to the A port. The oil is discharged from the A port and then enters the inlet port F of the bridge lifting winch motor 9.3 through the one-way valve 3.7 to drive the bridge to lift. The return oil from the bridge lifting winch motor 9.3 enters the three-position solenoid directional valve 6.3 through the E port. The right position of the three-position solenoid directional valve 6.3 is energized, and its B port is connected to the T port to discharge oil into the return oil pipe T3, and then returns to the hydraulic oil tank 1.1 through the return oil one-way valve 11.3.

[0073] The above-mentioned automatic operation function of the accumulator is controlled by the PLC. As the number of times the accumulator operates increases, when the system PLC (programmable logic controller) detects that the pressure value of pressure sensor +8.10 is less than 3MPa or the pressure value of pressure sensor +8.12 is less than 11MPa, the PLC will automatically start the bridge-raising and steel pile trolley pump group 2.3 and overflow valve 3.4.3 according to the conventional bridge-raising method. After the oil pressure is built up, it enters the three-position solenoid directional valve 3.6 through check valve 3.3. At port P of .3, the right position of the three-position solenoid directional valve 6.3 is energized. Port P is connected to port A, and the discharged oil flows through the balance valve 4.9 and port F into the bridge hoisting winch motor 9.3 to drive the bridge to lift. The return oil from the bridge hoisting winch motor 9.3 flows through port E into the three-position solenoid directional valve 6.3. The right position of the three-position solenoid directional valve 6.3 is energized, and its port B is connected to port T, discharging the oil into the return oil pipe T3, and then returning to the hydraulic oil tank 1.1 through the return oil check valve 11.3.

[0074] 5. Working principle of automatic oil transfer in potential energy recovery tank

[0075] The oil from the potential energy recovery tank 1.2 is discharged by the oil passing through the shut-off valve 7.5 and the two-position solenoid valve 10.10 in sequence. At this time, the two-position solenoid valve 10.10 is energized, and the P port is connected to the A port to discharge the oil to the E port on the oil inlet side when the bridge hoisting winch motor 9.3 is releasing the cable.

[0076] The oil inlet of the potential energy recovery tank 1.2 consists of the return oil when the booster cylinder 16 is working, the return oil when the low-pressure accumulator 14.1 overflows through the overflow valve 4.5, and the return oil when the high-pressure accumulator 14.2 overflows through the overflow valve 4.6.

[0077] To prevent the oil level in the potential energy recovery tank 1.2 from being too high or too low due to an imbalance in the oil inflow and outflow, a low-level switch 18.1 and a high-level switch 18.2 are installed on the potential energy recovery tank 1.2. When the oil level triggers the low-level switch 18.1, it sends a signal to the PLC, automatically starting the bridge-raising and steel pile trolley pump unit 2.3 and energizing the overflow valve 4.3. The oil then enters the potential energy recovery tank 1.2 through the check valve 3.3, the two-position solenoid valve 10.8 (the two-position solenoid valve 10.8 is energized, and its P port is connected to its A port), and the check valve 3.5 for replenishment. When the oil level triggers the high-level switch 18.2, it sends a signal to the PLC to stop the bridge-raising and steel pile trolley pump unit 2.3, de-energize the overflow valve 4.3, and de-energize the two-position solenoid valve 10.8, thus stopping the replenishment.

[0078] II. Hydraulic Pump and Motor Condition Monitoring System

[0079] like Figure 1 As shown in the hydraulic schematic diagram of an existing cutter suction dredger without hydraulic pump and motor status monitoring, wear and tear on the hydraulic pump or motor is not easily detected. During operation, the hydraulic pump is easily affected by impurities, moisture, dust, and other factors, which exacerbates the corrosion and wear of the internal components. Furthermore, due to the cumulative working time, the natural wear of the hydraulic pump increases. It is only when the hydraulic pump or motor is damaged to the point of affecting normal use that it is discovered. At this point, not only will the hydraulic system be contaminated and the contaminants damage other components in the system, but the maintenance will also cause downtime, affecting the progress of the project and resulting in greater economic losses.

[0080] like Figure 2As shown in the hydraulic schematic diagram of the cutter suction dredger provided in the embodiment of the present invention, taking the cutter pump group 2.1 in the cutter system as an example, when the cutter pump group 2.1 is working, the leaking oil from its pump casing flows back to the hydraulic oil tank 1.1 through the temperature sensor-13.1, the flow meter-5.1, and the metal detection filter-12.1 in sequence. The PLC, through temperature sensor 13.1, flow meter 5.1, and metal detector filter 12.1, first extracts the temperature and flow rate of the leaking oil from the cutter pump unit 2.1 during normal operation, as well as the metal shavings content from the filter. While the cutter pump unit 2.1 is operating, it continuously collects the temperature and flow rate of the leaking oil and the metal shavings content from the filter. As usage time increases and wear intensifies, the temperature of the leaking oil from the pump or motor will rise, the leakage flow rate will increase, and the metal shavings will accumulate. The PLC compares the data values ​​in Table 1 with the initial values. When the changes reach the corresponding values ​​in the first, second, and third rows of the table (the change values ​​for different models of hydraulic pumps and motors can be set according to the manufacturer's recommendations), it outputs an indication, automatically reminding the operator to take corresponding measures. The status monitoring principle of the transverse pump unit 2.2, the bridge lifting and steel pile trolley pump unit 2.3, the cutter motor 9.1, the transverse winch motor 9.2, and the bridge lifting winch motor 9.3 in the system is the same as that of the cutter pump unit 2.1.

[0081] The hydraulic system provided by this invention collects and monitors data such as flow rate, temperature, and metal detection for important components such as hydraulic pumps and motors. This allows for the determination of the wear level and remaining service life of the hydraulic pumps and motors, and the creation of spare parts plans to prevent component damage from affecting system safety and project progress.

[0082] Table 1. Variations and Corresponding Output Indicators of the Cutter Pump Unit 2.1

[0083]

[0084] III. Working Principle of Oil Leakage Protection Function

[0085] like Figure 1 As shown in the hydraulic schematic diagram of an existing cutter suction dredger without oil leakage protection, taking the cutter motor 9.1 in the cutter system as an example, oil leakage is prone to occur in the pipeline between the three-position solenoid directional valve 6.1 and the cutter motor 9.1. Moreover, this section of pipeline is long, and part of the pipeline and the cutter motor are in the water, so the leakage is not easy to detect, which can easily lead to increased leakage and environmental pollution.

[0086] like Figure 2As shown in the hydraulic schematic diagram of the cutter suction dredger provided in this embodiment of the invention, pressure sensors 8.1 and 8.2 are installed between the three-position electromagnetic directional valve 6.1 and the cutter motor 9.1. Since the minimum inlet and outlet pressure of the cutter motor 9.1 during operation is greater than the pressure of the return check valve 11.1 (1 MPa) and the pipeline resistance (approximately 0.2 MPa), the PLC is set to monitor pressure sensors 8.1 and 8.2 during operation. When the pressure drops below 0.8 MPa, it is determined that an oil leak has occurred. The PLC automatically stops the mechanism and shuts off the current hydraulic pump source to reduce oil leakage. Simultaneously, an alarm is output to the operator for on-site inspection. The oil leakage protection working principle of the transverse winch motor 9.2, the bridge lifting winch motor 9.3, the trolley cylinder 9.4, and the steel pile lifting cylinder 9.5 in the system is the same as that of the cutter motor 9.1.

[0087] IV. Oil Leakage Emergency Function Description

[0088] like Figure 1 As shown in the hydraulic schematic diagram of an existing cutter suction dredger without an emergency oil leak function, since the return oil lines of each actuator share a T-pipe and the drain oil lines share an L-pipe, when an actuator system leaks oil, if other actuators need to be activated urgently, hydraulic oil will flow back to the leaking point from the return oil manifold or drain oil manifold, causing a large amount of oil leakage. Taking the cutter motor 9.1 in the cutter system as an example, if there is an oil leak in the pipeline between the three-position solenoid directional valve 6.1 and the cutter motor 9.1, or if the cutter motor 9.1 malfunctions, the bridge needs to be raised to the water surface for maintenance. If the bridge winch motor 9.3 operates at this time, its return oil will flow from the main pipe T and the leaking oil will flow from the drain oil manifold L together to the leaking point between the three-position solenoid directional valve 6.1 and the cutter motor 9.1, causing increased leakage and environmental pollution.

[0089] like Figure 2As shown in the hydraulic schematic diagram of the cutter suction dredger provided in this embodiment of the invention, it has an emergency function in case of oil leakage. Since the cutter system, the lateral movement system, the bridge lifting system and the steel pile trolley system have their own independent return oil pipelines and drain oil pipelines, when an actuator system leaks oil, if other actuators need to be activated urgently, the hydraulic oil will not flow back to the leaking point from the return oil main pipe or the drain oil main pipe. Taking the cutter system within the cutter system as an example, when an oil leak occurs in the pipeline between the three-position solenoid directional valve 6.1 and the cutter motor 9.1, the bridge needs to be raised to the water surface for repair. At this time, the bridge winch motor 9.3 is working, and its return oil will enter the return oil pipe T3 through the T port of the three-position solenoid directional valve 6.3, and then flow back to the hydraulic oil tank 1.1 through the return oil check valve 11.3. The leaking oil from the bridge winch motor 9.3 passes sequentially through the temperature sensor 13.6, the flow meter 5.6, and the metal detector filter 12.6, and enters the drain pipe L3, and then flows back to the hydraulic oil tank 1.1. In this way, no oil will flow into the return oil pipe T1 and the drain pipe L1 of the cutter motor 9.1, thus preventing oil leakage at the leak point, protecting the environment and improving ship safety.

[0090] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hydraulic system of a cutter suction dredger with potential energy recovery, intelligent monitoring and leakage protection, comprising a hydraulic oil tank, a cutter system, a traversing system, a bridge and pile jack system, an emergency pump system and a bridge winch motor; the hydraulic oil tank is connected with the cutter system, the traversing system, the bridge and pile jack system and the emergency pump system respectively; characterized in that: The potential energy recovery system is connected with the bridge lifting and steel pile trolley system and the hydraulic oil tank respectively. The potential energy recovery oil tank, the stop valve five, the two-position electromagnetic valve ten, the oil inlet E port of the bridge hoist winch motor when releasing the cable, the oil outlet F port of the bridge hoist winch motor when releasing the cable, the two-position electromagnetic valve four and the one-way valve six are sequentially connected to form a potential energy recovery oil tank oil outlet pipeline. The one-way valve six side outlet, the single throttle valve group one, the stop valve six and the low-pressure accumulator are sequentially connected to form a low-pressure accumulator oil pipeline. The low-pressure accumulator, the stop valve six, the single throttle valve group one, the two-position electromagnetic valve five, the one-way valve twelve and the brake cylinder of the bridge hoist winch motor are sequentially connected to form a low-pressure working oil pipeline. The one-way valve six other side outlet, the sequence valve, the two-position electromagnetic valve six, the pressure cylinder, the single throttle valve group two, the stop valve eight and the high-pressure accumulator are sequentially connected to form a high-pressure accumulator oil pipeline.

2. The cutter suction dredger hydraulic system with potential energy recovery, intelligent monitoring and leakage protection according to claim 1, characterized in that: The high-pressure accumulator, the stop valve eight, the single throttle valve group two, the two-position electromagnetic valve seven, the one-way valve seven and the oil inlet F port of the bridge hoist winch motor when lifting are sequentially connected to form a high-pressure working oil pipeline.

3. The cutter suction dredger hydraulic system with potential energy recovery, intelligent monitoring and leakage protection according to claim 1, characterized in that: The low-pressure accumulator and the high-pressure accumulator are connected with the potential energy recovery oil tank through the accumulator maintenance protection system.

4. The cutter suction dredger hydraulic system with potential energy recovery, intelligent monitoring and leakage protection according to claim 1, characterized in that: The accumulator maintenance protection system includes the stop valve seven, the stop valve nine, the overflow valve five and the overflow valve six.

5. The cutter suction dredger hydraulic system with potential energy recovery, intelligent monitoring and leakage protection according to claim 4, characterized in that: The stop valve seven and the overflow valve five are connected with the potential energy recovery oil tank through the oil return pipeline eight. The accumulator working system includes the pressure sensor ten, the pressure sensor eleven, the pressure sensor twelve and the pressure sensor thirteen. The bridge lifting and steel pile trolley system includes a bridge lifting and steel pile trolley pump group. The three-position electromagnetic reversing valve three outlet A port, the balance valve group, the two-position electromagnetic valve four, the pressure sensor five and the oil inlet F port of the bridge hoist winch motor when lifting are sequentially connected. The three-position electromagnetic reversing valve three outlet B port, the pressure sensor six and the oil return port E port of the bridge hoist winch motor when lifting are sequentially connected. The three-position electromagnetic reversing valve three return port T port is connected with the hydraulic oil tank through the oil return pipeline three.

6. The cutter suction dredger hydraulic system with potential energy recovery, intelligent monitoring and leakage protection according to claim 4, characterized in that: The leakage oil outlet of the bridge and steel pile trolley pump group is sequentially connected with a temperature sensor three, a flow meter three and a metal detection filter three, the metal detection filter three is connected with the hydraulic oil tank.

7. The cutter suction dredger hydraulic system with potential energy recovery, intelligent monitoring and leakage protection according to claim 1, characterized in that: The leakage oil outlet of the bridge winch motor is sequentially communicated with a temperature sensor six, a flow meter six and a metal detection filter six, the metal detection filter six is connected with the hydraulic oil tank through an oil drain pipeline three.

8. The cutter suction dredger hydraulic system with potential energy recovery, intelligent monitoring and leakage protection according to claim 1, characterized in that: The accumulator pressure storage system further comprises a two-position electromagnetic valve eight, the two-position electromagnetic valve eight is arranged in parallel with the three-position electromagnetic reversing valve three, the hydraulic oil tank, a stop valve three, the bridge and steel pile trolley pump group, a one-way valve three, a pressure sensor sixteen, the two-position electromagnetic valve eight, a one-way valve five and a potential energy recovery oil tank are sequentially communicated to form a potential energy recovery oil tank oil supplement pipeline.

9. The cutter suction dredger hydraulic system with potential energy recovery, intelligent monitoring and leakage protection according to claim 1, characterized in that: Low and high liquid level switches are installed on the potential energy recovery oil tank.

10. The cutter suction dredger hydraulic system with potential energy recovery, intelligent monitoring and leakage protection according to claim 1, characterized in that: The emergency pump system comprises an emergency hydraulic pump, the inlet of the emergency hydraulic pump is connected with the hydraulic oil tank through a stop valve four, the outlet of the emergency hydraulic pump is respectively connected with an overflow valve four, a two-position electromagnetic valve one, a two-position electromagnetic valve two and a two-position electromagnetic valve three through a one-way valve four, the overflow valve four is communicated with the hydraulic oil tank through an oil return pipeline seven; the outlets of the two-position electromagnetic valve one, the two-position electromagnetic valve two and the two-position electromagnetic valve three are respectively connected with a reamer system, a horizontal movement system and a bridge and steel pile trolley system.

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