A cooling and energy-saving hydraulic system of multifunctional dredging equipment

Abstract

The application discloses a kind of cooling energy-saving hydraulic systems of multifunctional dredging equipment, including power source hydraulic system, power source emergency and replacement system, cooling energy-saving control system, conveying device hydraulic system, positioning device hydraulic system and dredging device hydraulic system, power source hydraulic system is connected conveying device hydraulic system, positioning device hydraulic system, dredging device hydraulic system respectively by power source emergency and replacement system.The power source emergency and replacement system designed by the application automatically judges working condition by PLC logic controller and issues command to execute action, and the pump source of non-working system can be integrated into working system;Cooling pump source does not need to be separately established, and the speed of cooling fan can be automatically adjusted by cooling energy-saving control system according to hydraulic oil temperature, which effectively reduces energy consumption and saves energy.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of cooling energy-saving technology, in particular to a cooling energy-saving hydraulic system of multifunctional dredging equipment. BACKGROUND

[0002] The amphibious multifunctional environmental dredging dredger is mainly produced and used in European Finland, Belgium and other countries. In recent years, domestic manufacturers also produce such dredgers for dredging and desilting. The amphibious multifunctional environmental dredging dredger is mainly used for water conservancy and environmental desilting engineering in inland rivers and lake water areas. The dredger has the functions of cutter suction dredging operation, backhoe dredging operation, rake operation, grab dredging operation and piling operation. The several operation modes are realized by replacing various working devices at the front end of the dredging arm. The dredger is an environmental dredger equipped with a dredging arm, a stabilizing device, a tiltable steel pile and a propeller, and can freely navigate and move on land by using the combined action of the dredging arm and the backward tilting steel pile.

[0003] Whether it is foreign or domestic amphibious multifunctional environmental dredging dredger, its cooling system is driven by a special motor to drive a hydraulic pump to supply oil to drive a cooling motor, and the motor drives the fan to cool at a fixed speed. The energy conversion is multiple, and the energy loss is large. Moreover, the motor and hydraulic pump and other equipment not only increase the cost of the ship, but also occupy space on the ship, affecting the arrangement of the equipment. In addition, the hydraulic pump source has no emergency function. When one hydraulic pump fails, the system it drives will be paralyzed and cannot move, affecting the safety of the ship. SUMMARY

[0004] In order to solve the problems existing in the prior art, the present application provides a cooling energy-saving, safe and efficient cooling energy-saving hydraulic system of multifunctional dredging equipment. The hydraulic system not only does not need to set up a separate cooling pump source, but also can automatically adjust the speed of the cooling fan according to the temperature of the hydraulic oil, and is efficient and energy-saving.

[0005] The present application is realized in the following way. A cooling energy-saving hydraulic system of multifunctional dredging equipment, comprising a power source hydraulic system, a power source emergency and replacement system, a cooling energy-saving control system, a conveying device hydraulic system, a positioning device hydraulic system and a dredging device hydraulic system, the power source hydraulic system is connected with the conveying device hydraulic system, the positioning device hydraulic system and the dredging device hydraulic system through the power source emergency and replacement system respectively;

[0006] The power source hydraulic system comprises hydraulic pump one, hydraulic pump two, hydraulic pump three, oil tank, oil return main pipe T and temperature sensor, the suction of the hydraulic pump one, the hydraulic pump two and the hydraulic pump three is connected with the outlet of the oil tank, the outlet of the hydraulic pump one, the hydraulic pump two and the hydraulic pump three is connected with the hydraulic system of each actuator respectively, the oil return main pipe T is connected with the oil return port of the oil tank, and the temperature sensor is installed at the lower part of the oil tank;

[0007] The power source emergency and replacement system comprises one-way plug-in valve one, one-way plug-in valve two, one-way plug-in valve three, plug-in valve four, plug-in valve five, control shuttle valve one, control shuttle valve two, electromagnetic valve one and electromagnetic valve two; the outlet oil way of the hydraulic pump one is provided with the one-way plug-in valve three, the outlet oil way of the hydraulic pump two is provided with the one-way plug-in valve two, and the outlet oil way of the hydraulic pump three is provided with the one-way plug-in valve one; the B port of the one-way plug-in valve one is connected with the A port of the control shuttle valve one and the A port of the plug-in valve four respectively, the B port of the control shuttle valve one is connected with the outlet oil way of the hydraulic pump two, the C port of the control shuttle valve one is connected with the P port of the electromagnetic valve one through a damping hole, the A port of the electromagnetic valve one is connected with the X cavity of the plug-in valve four through a damping hole, the T port of the electromagnetic valve one is connected with the oil return pipe T5, and the B port of the plug-in valve four is connected with the outlet oil way of the hydraulic pump two; the B port of the one-way plug-in valve three is connected with the B port of the control shuttle valve two and the A port of the plug-in valve five respectively, the A port of the control shuttle valve two is connected with the outlet oil way of the hydraulic pump two, the C port of the control shuttle valve two is connected with the P port of the electromagnetic valve two through a damping hole, the A port of the electromagnetic valve two is connected with the X cavity of the plug-in valve five through a damping hole, the T port of the electromagnetic valve two is connected with the oil return pipe T5, and the B port of the plug-in valve five is connected with the outlet oil way of the hydraulic pump two; the oil return pipe T5 is connected with the inlet of the cooler of the oil return main pipe T;

[0008] The cooling energy-saving control system comprises one-way valve three, one-way valve four, one-way valve five, pressure reducing valve, high-pressure oil filter, proportional speed regulating valve, fan hydraulic motor, cooling fan, cooler, stop valve one, energy accumulator and safety valve five; the outlet of the hydraulic pump three is connected with the inlet of the pressure reducing valve through the one-way valve three, the outlet of the hydraulic pump two is connected with the inlet of the pressure reducing valve through the one-way valve four, the outlet of the hydraulic pump one is connected with the inlet of the pressure reducing valve through the one-way valve five, the outlet of the pressure reducing valve is connected with the inlet of the high-pressure oil filter, the outlet of the high-pressure oil filter is connected with the inlet of the proportional speed regulating valve, the outlet of the proportional speed regulating valve is connected with the inlet of the fan hydraulic motor, the outlet of the fan hydraulic motor is connected with the oil return pipe T4, the fan hydraulic motor drives the cooling fan to rotate, and the cooling fan provides cooling air for the cooler; the outlet of the high-pressure oil filter is connected with the energy accumulator through the stop valve one, and the energy accumulator is connected with the oil return pipe T4 through the safety valve five; the oil return pipe T5 of the power source emergency and replacement system, the oil return pipe T1 of the conveying device hydraulic system, the oil return pipe T2 of the positioning device hydraulic system and the oil return pipe T3 of the dredging device hydraulic system are all connected with the inlet of the cooler, and the outlet of the cooler is connected with the oil return pipe T4.

[0009] The outlet of the hydraulic pump one drives the action of the conveying device through the conveying device hydraulic system;

[0010] The outlet of the hydraulic pump two drives the action of the positioning device through the positioning device hydraulic system, so that the ship is stably positioned and the dredging construction is facilitated;

[0011] The outlet of the hydraulic pump three drives the action of the dredging device through the dredging device hydraulic system, so that the dredging is completed.

[0012] Preferably, the hydraulic pump one, the hydraulic pump two and the hydraulic pump three are driven by a diesel engine, the suction port of the hydraulic pump one, the hydraulic pump two and the hydraulic pump three is connected with the outlet of the oil tank through a suction butterfly valve, and the cooler and the total oil return filter are arranged along the oil return direction in the total oil return pipe T, so that the oil return passes through the cooler and the total oil return filter to return to the oil tank.

[0013] Preferably, the oil tank is provided with a low-pressure oil filter, an air filter, an oil temperature alarm, a high liquid level alarm, a low liquid level alarm and a liquid level gauge, the low-pressure oil filter is installed at the outlet of the oil tank, the air filter and the oil temperature alarm are installed at the top of the oil tank, the oil temperature alarm extends below the oil surface, the high liquid level alarm and the low liquid level alarm are respectively installed at the high liquid level and the low liquid level of the side wall of the oil tank, and the liquid level gauge is installed on one side of the side wall of the oil tank.

[0014] Preferably, the conveying device hydraulic system comprises a conveying device control valve group, an underwater pump hydraulic motor for driving the underwater pump to suck and discharge mud at high pressure, and a propeller hydraulic motor for driving the propeller to enable the multifunctional environmental protection dredger to sail on the water surface; the outlet of the hydraulic pump one is connected with the A1 and B1 ports of the underwater pump hydraulic motor and the A1 and B1 ports of the propeller hydraulic motor through the conveying device control valve group, and the oil return pipe T1 of the conveying device control valve group is connected with the inlet of the cooler on the total oil return pipe T.

[0015] Further preferably, the delivery device control valve group comprises an electromagnetic overflow valve group, a one-way valve one, a one-way valve two, a delivery proportional directional valve one, a delivery proportional directional valve two, and four safety valves; the outlet of the hydraulic pump one is connected to the P port of the delivery proportional directional valve one through the one-way valve one, the A port of the delivery proportional directional valve one is connected to the A1 port of the underwater pump hydraulic motor, and the B port of the delivery proportional directional valve one is connected to the B1 port of the underwater pump hydraulic motor; the outlet of the hydraulic pump one is connected to the P port of the delivery proportional directional valve two through the one-way valve two, the A port of the delivery proportional directional valve two is connected to the A1 port of the propeller hydraulic motor, and the B port of the delivery proportional directional valve two is connected to the B1 port of the propeller hydraulic motor; the inlet of the electromagnetic overflow valve group is connected to the inlets of the one-way valve one and the one-way valve two, respectively, and the outlet of the electromagnetic overflow valve group, the T port of the delivery proportional directional valve one, and the T port of the delivery proportional directional valve two are all connected to the oil return pipe T1; the A1 and B1 ports of the underwater pump hydraulic motor and the A1 and B1 ports of the propeller hydraulic motor are respectively connected to one end of a safety valve, and the other end of the four safety valves is connected to the oil return pipe T1.

[0016] Preferably, the dredging device hydraulic system comprises a dredging device control valve group, a cutter hydraulic motor for driving a cutter to cut underwater soil so as to be sucked away by an underwater pump, and a plurality of dredging hydraulic cylinders for driving a dredger arm to complete a dredging action, the outlet of the hydraulic pump three is connected to the A1 and B1 ports of the cutter hydraulic motor and the rod cavity and the rodless cavity of each dredging hydraulic cylinder through the dredging device control valve group, and the oil return pipe T3 of the dredging device control valve group is connected to the inlet of the cooler on the oil return main pipe T.

[0017] Preferably, the positioning device hydraulic system comprises a positioning device control valve group, a positioning hydraulic cylinder one for driving a left front balancer to act, a positioning hydraulic cylinder two for driving a right front balancer to act, a positioning hydraulic cylinder three for driving a left rear steel pile lifting device to act, a positioning hydraulic cylinder four for driving a right rear steel pile lifting device to act, a positioning hydraulic cylinder five for driving a left rear steel pile tilting device to act, a positioning hydraulic cylinder six for driving a right rear steel pile tilting device to act, and a positioning hydraulic cylinder seven for driving a propeller extending device to act; the outlet of the hydraulic pump two is connected to the rod cavity and the rodless cavity of each positioning hydraulic cylinder through the positioning device control valve group, and the oil return pipe T2 of the positioning device control valve group is connected to the inlet of the cooler on the oil return main pipe T.

[0018] Preferably, a stop valve two is further arranged on the oil return path of the accumulator, and the stop valve two is connected in parallel with the safety valve five.

[0019] The present application has the following advantages and beneficial effects:

[0020] (1) The cooling energy-saving control system of the present application changes the original transmission mode of the motor-driven hydraulic pump, the hydraulic pump driving the hydraulic motor, and then the hydraulic motor driving the cooling fan into a transmission mode without the need for a motor and a hydraulic pump, and directly bypasses and stores the high-pressure oil in the three main hydraulic pumps in the system to the accumulator. When any hydraulic system is in operation, part of the high-pressure oil output by the hydraulic pump is stored in the accumulator, and then the high-pressure oil is released from the accumulator to drive the fan hydraulic motor, which drives the cooling fan to cool. This transmission mode reduces the energy conversion process from electrical energy to hydraulic energy, directly converts hydraulic energy into mechanical energy, reduces energy loss, saves energy, and reduces the use of electrical components and hydraulic pump components required for motor start control, saving the cost of the ship and the space originally occupied by these devices on the ship, which is beneficial to the arrangement of ship equipment.

[0021] (2) The cooling energy-saving control system of the present application changes the original cooling mode of the fan hydraulic motor driving the cooling fan at a constant speed into a mode in which the opening of the proportional speed regulating valve is automatically adjusted according to the oil temperature of the hydraulic system by the PLC logic controller and the hydraulic control valve group based on the system monitoring oil temperature, and then the fan hydraulic motor speed is adjusted to drive the cooling fan. This cooling energy-saving control system can effectively reduce energy consumption and save energy.

[0022] Automatic adjustment logic one: in winter or when the system just starts to work, that is, when the oil temperature is low, the system monitors that the oil temperature is below the normal set value (for example, below 35℃), the proportional speed regulating valve is closed, the fan hydraulic motor does not rotate, and the cooling fan is not driven.

[0023] Automatic adjustment logic two: when the system runs for a period of time in summer or the oil temperature rises, the system monitors that the oil temperature rises to the medium-high temperature set value (for example, 35℃ to 50℃), the PLC logic controller automatically increases the opening of the proportional speed regulating valve to half the state, the fan hydraulic motor runs at low speed, and the cooling fan is driven to cool.

[0024] Automatic adjustment logic three: when the system runs for a long time and the environmental temperature is high, the system monitors that the oil temperature rises to the high temperature set value (for example, above 50℃), the PLC logic controller automatically increases the opening of the proportional speed regulating valve to the full open state, the fan hydraulic motor runs at high speed, and the cooling fan is driven to cool.

[0025] When the oil temperature decreases to the normal set value, the opening of the proportional speed regulating valve is automatically reduced, and the speed of the fan hydraulic motor is reduced.

[0026] (3) The power source emergency and replacement system designed in the present application is automatically judged by the PLC logic controller according to the working condition and issues a command to execute the action, and the pump source of the non-working system can be integrated into the working system.

[0027] Working condition one: when the ship is in backhoe dredging operation, grab dredging operation, or piling operation, because the conveying device and the positioning device do not need to work most of the time during construction, the power source emergency and replacement system detects that only the dredging device is working, at this time, the system automatically combines the pump source P1 supplying the conveying device and the pump source P2 supplying the positioning device into the dredging device P3 such as excavator arm through the PLC logic controller and the hydraulic control valve group, so as to improve the dredging speed of the dredging device and improve the construction efficiency;

[0028] Working condition two: when the ship freely sails after entering the water, the dredging device and the positioning device do not work, and no flow input is needed, the power source emergency and replacement system detects that only the propeller hydraulic motor in the conveying device sends a command to work, at this time, the system automatically combines the pump source P3 supplying the dredging device and the pump source P2 supplying the positioning device into P1 through the PLC logic controller and the hydraulic control valve group, so as to increase the flow input into the propeller hydraulic motor, improve the rotation speed of the propeller hydraulic motor, increase the ship propulsion speed, so that the size of the hydraulic pump of the conveying device hydraulic system can be selected to be small, which reduces the ship construction cost, reduces the volume of the hydraulic pump, saves the engine room space, is beneficial to the arrangement of other equipment in the engine room, and also reduces the flow overflow loss of other pumps and system heating;

[0029] When one of the three pumps fails, the valves of the two combined pumps are powered on to open, so that the three pumps are connected in parallel, at this time, the pump sources of the other two pumps will supply the system of the pump with fault, so as to complete the emergency action of the execution element of the fault system and protect the safety of the ship and the person. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is the structural block diagram of the cooling energy-saving hydraulic system provided by the embodiment of the present application;

[0031] Figure 2 is the hydraulic principle diagram of the power source hydraulic system provided by the embodiment of the present application;

[0032] Figure 3 is the hydraulic principle diagram of the conveying device hydraulic system provided by the embodiment of the present application;

[0033] Figure 4 is the hydraulic principle diagram of the dredging device hydraulic system provided by the embodiment of the present application;

[0034] Figure 5 is the hydraulic principle diagram of the positioning device hydraulic system provided by the embodiment of the present application;

[0035] Figure 6 is the hydraulic principle diagram of the power source emergency and replacement system provided by the embodiment of the present application;

[0036] Figure 7A hydraulic schematic diagram of a cooling energy-saving control system provided by an embodiment of the present application;

[0037] Figure 8 A front view of a main part of a hydraulic motor and a hydraulic cylinder installed on an environmental dredging ship according to an embodiment of the present application;

[0038] Figure 9 A top view of a main part of a hydraulic motor and a hydraulic cylinder installed on an environmental dredging ship according to an embodiment of the present application.

[0039] Fig. 1, oil tank; 2, low-pressure oil filter; 3, liquid level gauge; 4, air cleaner; 5.1, high liquid level alarm; 5.2, low liquid level alarm; 6, oil temperature alarm; 7.1, hydraulic pump one; 7.2, hydraulic pump two; 7.3, hydraulic pump three; 8.1, suction butterfly valve; 8.2, stop valve one; 8.3, stop valve two; 8.4, stop valve three; 9.1, speed regulating valve one; 9.2, speed regulating valve two; 10.1, electromagnetic overflow valve group; 10.2, safety valve one; 10.3, safety valve two; 10.4, safety valve three; 10.5, safety valve four; 10.6, overflow valve one; 10.7, overflow valve two; 10.8, safety valve five; 11.1, check valve one; 11.2, check valve two; 11.3, check valve three; 11.4, check valve four; 11.5, check valve five; 12.1, delivery proportional directional valve one; 12.2, delivery proportional directional valve two; 13.1, underwater pump hydraulic motor; 13.2, propeller hydraulic motor; 13.3, reamer hydraulic motor; 13.4, fan hydraulic motor; 14, pressure gauge; 15, cooler; 16.1, total oil return filter; 16.2, high-pressure oil filter; 17.1, multi-way valve control valve group two; 17.2, multi-way valve control valve group one; 18.1, dredging proportional directional valve one; 18.2, dredging proportional directional valve two; 18.3, dredging proportional directional valve three; 18.4, dredging proportional directional valve four; 18.5, dredging proportional directional valve five; 18.6, dredging proportional directional valve six; 18.7, dredging proportional directional valve seven; 18.8, positioning proportional directional valve one; 18.9, positioning proportional directional valve two; 18.10, positioning proportional directional valve three; 18.11, positioning proportional directional valve four; 18.12, positioning proportional directional valve five; 18.13, positioning proportional directional valve six; 18.14, positioning proportional directional valve seven; 19.1, dredging hydraulic oil cylinder one; 19.2, dredging hydraulic oil cylinder two; 19.3, dredging hydraulic oil cylinder three; 19.4, dredging hydraulic oil cylinder four; 19.5, dredging hydraulic oil cylinder five; 19.6, dredging hydraulic oil cylinder six; 19.7, dredging hydraulic oil cylinder seven; 19.8, dredging hydraulic oil cylinder eight; 19.9, positioning hydraulic oil cylinder one; 19.10, positioning hydraulic oil cylinder two; 19.11, positioning hydraulic oil cylinder three; 19.12, positioning hydraulic oil cylinder four; 19.13, positioning hydraulic oil cylinder five; 19.14, positioning hydraulic oil cylinder six; 19.15, positioning hydraulic oil cylinder seven; 20, pressure reducing valve; 21, proportional speed regulating valve; 22, accumulator; 23, cooling fan; 24.1, balance valve one; 24.2, balance valve two; 24.3, balance valve three; 24.4, balance valve four; 24.5, balance valve five; 24.6, balance valve six; 24.7, balance valve seven; 24.8, balance valve eight; 24.9, balance valve nine; 24.10, balance valve ten; 24.11, balance valve eleven; 24.12, balance valve twelve; 24.13, balance valve thirteen; 25.1, one-way throttle valve one; 25.2, one-way throttle valve two; 25.3, one-way throttle valve three; 25.4, one-way throttle valve four; 25.5, one-way throttle valve five; 25.6, one-way throttle valve six; 25.7, one-way throttle valve seven; 25.8, one-way throttle valve eight; 25.9, one-way throttle valve nine; 25.10, one-way throttle valve ten; 25.11, one-way throttle valve eleven; 25.12, one-way throttle valve twelve; 25.13, one-way throttle valve thirteen; 26, synchronization valve; 27, two-way hydraulic control one-way valve; 28.1, one-way cartridge valve one; 28.2, one-way cartridge valve two; 28.3, one-way cartridge valve three; 28.4, cartridge valve four; 28.5, cartridge valve five; 29.1, control shuttle valve one; 29.2, control shuttle valve two; 29.3, shuttle valve; 30.1, solenoid valve one; 30.2, solenoid valve two; 31, hydraulic control one-way valve; 32, temperature sensor. DETAILED DESCRIPTION

[0040] In order to make the objects, technical solutions and advantages of the present application clearer, the following further describes the present application with reference to the embodiments and drawings. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0041] In the description of the present application, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore should not be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be understood as limiting the present application.

[0042] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] Embodiment

[0044] Please refer to Figures 1-7 The embodiment provides a cooling and energy-saving hydraulic system of multifunctional dredging equipment, which comprises a power source hydraulic system, a power source emergency and replacement system, a cooling and energy-saving control system, a conveying device hydraulic system, a positioning device hydraulic system and a dredging device hydraulic system, wherein the power source hydraulic system is connected with the conveying device hydraulic system, the positioning device hydraulic system and the dredging device hydraulic system through the power source emergency and replacement system.

[0045] The power source hydraulic system comprises hydraulic pump one 7.1, hydraulic pump two 7.2, hydraulic pump three 7.3, oil tank 1, oil return main pipe T and temperature sensor 32, the suction ports of the hydraulic pump one 7.1, hydraulic pump two 7.2 and hydraulic pump three 7.3 are connected with the outlet of the oil tank 1, the outlet of the hydraulic pump one 7.1, hydraulic pump two 7.2 and hydraulic pump three 7.3 are respectively connected with the hydraulic system of each actuator corresponding to P1, P2 and P3, the oil return main pipe T is connected with the oil return port of the oil tank 1, and the temperature sensor 32 is installed at the lower part of the oil tank 1.

[0046] The hydraulic pump one 7.1, hydraulic pump two 7.2 and hydraulic pump three 7.3 are driven by the diesel engine, the suction ports of the hydraulic pump one 7.1, hydraulic pump two 7.2 and hydraulic pump three 7.3 are connected with the outlet of the oil tank 1 through the suction port butterfly valve 8.1, the oil return main pipe T is sequentially provided with the cooler 15 and the total oil return filter 16.1 in the oil return direction, so that the oil return passes through the cooler 15 and the total oil return filter 16.1 and returns to the oil tank 1.

[0047] The oil tank 1 is provided with a low-pressure oil filter 2, an air filter 4, an oil temperature alarm 6, a high liquid level alarm 5.1, a low liquid level alarm 5.2 and a liquid level gauge 3, the low-pressure oil filter 2 is installed at the outlet of the oil tank 1, the air filter 4 and the oil temperature alarm 6 are installed at the top of the oil tank 1, the oil temperature alarm 6 extends below the oil surface, the high liquid level alarm 5.1 and the low liquid level alarm 5.2 are respectively installed at the high liquid level and the low liquid level of the side wall of the oil tank 1, and the liquid level gauge 3 is installed at one side of the side wall of the oil tank 1.

[0048] The outlet of the hydraulic pump one 7.1 drives the underwater pump and the propeller of the conveying device through the conveying device hydraulic system.

[0049] The conveying device hydraulic system comprises a conveying device control valve group, an underwater pump hydraulic motor 13.1 for driving the underwater pump to suck and discharge mud at high pressure, and a propeller hydraulic motor 13.2 for driving the propeller to enable the multifunctional environmental-friendly dredger to sail on the water surface, the outlet of the hydraulic pump one 7.1 is connected with the A1 and B1 ports of the underwater pump hydraulic motor 13.1 and the A1 and B1 ports of the propeller hydraulic motor 13.2 through the conveying device control valve group, and the oil return pipe T1 of the conveying device control valve group is connected with the inlet of the cooler 15 on the oil return main pipe T.

[0050] The delivery device control valve group comprises an electromagnetic overflow valve group 10.1, a one-way valve 11.1, a one-way valve 11.2, a delivery proportional directional valve 12.1, a delivery proportional directional valve 12.2, a safety valve 10.2, a safety valve 10.3, a safety valve 10.4, and a safety valve 10.5. The outlet of the hydraulic pump 7.1 is connected to the P port of the delivery proportional directional valve 12.1 through the one-way valve 11.1, the A port of the delivery proportional directional valve 12.1 is connected to the A1 port of the underwater pump hydraulic motor 13.1, and the B port of the delivery proportional directional valve 12.1 is connected to the B1 port of the underwater pump hydraulic motor 13.1. The outlet of the hydraulic pump 7.1 is connected to the P port of the delivery proportional directional valve 12.2 through the one-way valve 11.2, the A port of the delivery proportional directional valve 12.2 is connected to the A1 port of the propeller hydraulic motor 13.2, and the B port of the delivery proportional directional valve 12.2 is connected to the B1 port of the propeller hydraulic motor 13.2. The inlet of the electromagnetic overflow valve group 10.1 is connected to the inlets of the one-way valve 11.1 and the one-way valve 11.2, respectively, the outlet of the electromagnetic overflow valve group 10.1, the T port of the delivery proportional directional valve 12.1, and the T port of the delivery proportional directional valve 12.2 are all connected to the oil return pipe T1. The A1 and B1 ports of the underwater pump hydraulic motor 13.1 and the A1 and B1 ports of the propeller hydraulic motor 13.2 are respectively connected to one end of a safety valve, and the other end of the four safety valves is connected to the oil return pipe T1. Specifically, one end of the safety valve 10.2 is connected to the A1 port of the underwater pump hydraulic motor 13.1, one end of the safety valve 10.3 is connected to the B1 port of the underwater pump hydraulic motor 13.1, one end of the safety valve 10.4 is connected to the A1 port of the propeller hydraulic motor 13.2, one end of the safety valve 10.5 is connected to the B1 port of the propeller hydraulic motor 13.2, and the other end of the safety valve 10.2, the other end of the safety valve 10.3, the other end of the safety valve 10.4, and the other end of the safety valve 10.5 are all connected to the oil return pipe T1.

[0051] The high-pressure hydraulic oil P1 from the outlet of the hydraulic pump 7.1 enters the A and B ports of the two delivery proportional directional valves through two one-way valves and then enters the corresponding hydraulic motors. The outlet of the electromagnetic overflow valve group 10.1, the T ports of the delivery proportional directional valves, and the outlets of the four safety valves are all connected to the oil return pipe T1, and then pass through the cooler 15 and the total oil return filter 16.1 to return to the oil tank 1.

[0052] The outlet of the hydraulic pump 7.3 drives the cutter and the excavator arm of the dredging device through the hydraulic system of the dredging device to complete dredging.

[0053] The hydraulic system of the dredging device comprises a dredging device control valve group, a cutter hydraulic motor 13.3 for driving the cutter to cut the underwater soil so as to be sucked away by the underwater pump, and a plurality of dredging hydraulic cylinders for driving the large arm, small arm, bucket and other structural members of the excavator to complete the dredging action. The outlet of the hydraulic pump three 7.3 is connected with the A1 and B1 ports of the cutter hydraulic motor 13.3 and the rod cavity and the rodless cavity of each dredging hydraulic cylinder through the dredging device control valve group, and the return oil pipe T3 of the dredging device control valve group is connected with the inlet of the cooler 15 of the return oil main pipe T.

[0054] The dredging device control valve group comprises a multi-way valve control valve group one 17.2, a synchronization valve 26, a balance valve one 24.1, a balance valve two 24.2, a balance valve three 24.3, a one-way throttling valve one 25.1, a one-way throttling valve two 25.2, a one-way throttling valve three 25.3, a double-way hydraulic control one-way valve 27, a shuttle valve 29.3, and a stop valve three 8.4. The multi-way valve control valve group one 17.2 comprises a dredging proportional directional valve one 18.1, a dredging proportional directional valve two 18.2, a dredging proportional directional valve three 18.3, a dredging proportional directional valve four 18.4, a dredging proportional directional valve five 18.5, a dredging proportional directional valve six 18.6, a dredging proportional directional valve seven 18.7, an overflow valve two 10.7, and a speed regulating valve two 9.2. The dredging hydraulic cylinders comprise a dredging hydraulic cylinder one 19.1 and a dredging hydraulic cylinder two 19.2 for driving the rotation of the excavator arm, a dredging hydraulic cylinder three 19.3 and a dredging hydraulic cylinder four 19.4 for driving the action of the grab bucket, a dredging hydraulic cylinder five 19.5 for driving the action of the large arm of the excavator arm, a dredging hydraulic cylinder six 19.6 for driving the action of the small arm of the excavator arm, a dredging hydraulic cylinder seven 19.7 for driving the action of the bucket, and a dredging hydraulic cylinder eight 19.8 for driving the action of the pile grab.

[0055] The outlet of the hydraulic pump three 7.3 is connected with the P port of the dredging proportional directional valve one 18.1, the A port of the dredging proportional directional valve one 18.1 is connected with the rod cavity of the dredging hydraulic cylinder one 19.1 and the rodless cavity of the dredging hydraulic cylinder two 19.2, and the B port of the dredging proportional directional valve one 18.1 is connected with the rodless cavity of the dredging hydraulic cylinder one 19.1 and the rod cavity of the dredging hydraulic cylinder two 19.2.

[0056] The outlet of the hydraulic pump three 7.3 is connected with the P port of the dredging proportional directional valve two 18.2, the A port of the dredging proportional directional valve two 18.2 is connected with the rod cavity of the dredging hydraulic cylinder five 19.5, the B port of the dredging proportional directional valve two 18.2 is connected with the rodless cavity of the dredging hydraulic cylinder five 19.5 through the balance valve one 24.1 and the one-way throttling valve one 25.1 in sequence, and the control oil path of the balance valve one 24.1 is connected with the rod cavity side of the dredging hydraulic cylinder five 19.5 through a damping hole.

[0057] The outlet of the hydraulic pump three 7.3 is connected with the P port of the dredging proportional directional valve three 18.3, the A port of the dredging proportional directional valve three 18.3 is connected with the rod cavity of the dredging hydraulic cylinder six 19.6, the B port of the dredging proportional directional valve three 18.3 is connected with the rodless cavity of the dredging hydraulic cylinder six 19.6 through the balance valve two 24.2 and the one-way throttle valve two 25.2 in sequence, and the control oil way of the balance valve two 24.2 is connected with the rod cavity side of the dredging hydraulic cylinder six 19.6 through a damping hole;

[0058] The outlet of the hydraulic pump three 7.3 is connected with the P port of the dredging proportional directional valve four 18.4, the A port of the dredging proportional directional valve four 18.4 is connected with the rod cavity of the dredging hydraulic cylinder seven 19.7, the B port of the dredging proportional directional valve four 18.4 is connected with the rodless cavity of the dredging hydraulic cylinder seven 19.7 through the balance valve three 24.3 and the one-way throttle valve three 25.3 in sequence, and the control oil way of the balance valve three 24.3 is connected with the rod cavity side of the dredging hydraulic cylinder seven 19.7 through a damping hole;

[0059] The outlet of the hydraulic pump three 7.3 is connected with the P port of the dredging proportional directional valve five 18.5, the A port of the dredging proportional directional valve five 18.5 is connected with the rod cavity of the dredging hydraulic cylinder three 19.3 and the rod cavity of the dredging hydraulic cylinder four 19.4, and the B port of the dredging proportional directional valve five 18.5 is connected with the rodless cavity of the dredging hydraulic cylinder three 19.3 and the rodless cavity of the dredging hydraulic cylinder four 19.4 through the synchronous valve group 26;

[0060] The outlet of the hydraulic pump three 7.3 is connected with the P port of the dredging proportional directional valve six 18.6, the A port of the dredging proportional directional valve six 18.6 is connected with the rod cavity of the dredging hydraulic cylinder eight 19.8 through one inlet and outlet of the bidirectional hydraulic control one-way valve 27, and the B port of the dredging proportional directional valve six 18.6 is connected with the rodless cavity of the dredging hydraulic cylinder eight 19.8 through the other inlet and outlet of the bidirectional hydraulic control one-way valve 27;

[0061] The outlet of the hydraulic pump three 7.3 is connected with the P port of the dredging proportional directional valve seven 18.7, the A port of the dredging proportional directional valve seven 18.7 is connected with the A1 port of the cutter hydraulic motor 13.3, the B port of the dredging proportional directional valve seven 18.7 is connected with the B1 port of the cutter hydraulic motor 13.3, two inlets of the shuttle valve 29.3 are connected with the B port of the dredging proportional directional valve seven 18.7 and the B1 port of the cutter hydraulic motor 13.3 respectively, the outlet of the shuttle valve 29.3 is connected with the stop valve three 8.4, and the outlet of the stop valve three 8.4 is connected with the pressure gauge 14;

[0062] The T port of the dredging proportional directional valve 18.1, the T port of the dredging proportional directional valve 18.2, the T port of the dredging proportional directional valve 18.3, the T port of the dredging proportional directional valve 18.4, the T port of the dredging proportional directional valve 18.5, the T port of the dredging proportional directional valve 18.6, and the T port of the dredging proportional directional valve 18.7 are connected with the oil return pipe T3; the inlet of the overflow valve 10.7 is connected with the outlet of the hydraulic pump 3, and the outlet of the overflow valve 10.7 is connected with the oil return pipe T3; the speed regulating valve 9.2 is arranged on the oil return pipe T3.

[0063] The high-pressure hydraulic oil P3 of the outlet of the hydraulic pump 3 enters the multi-way valve control valve group 1 7.2, enters each dredging proportional directional valve, respectively, enters the valve group of the balance valve, the synchronization valve 26 or the bidirectional hydraulic control one-way valve 27, and finally outputs into each dredging hydraulic oil cylinder or the drag bit hydraulic motor 13.3, respectively. The oil return of the drag bit hydraulic motor 13.3 and each dredging hydraulic oil cylinder enters the multi-way valve control valve group 1 7.2 again, returns to the oil tank 1 through the cooler 15 and the total oil return filter 16.1 through the oil return pipe T3.

[0064] The outlet of the hydraulic pump 2 7.2 drives the positioning device to act through the positioning device hydraulic system, pushes out and presses into the mud surface, lifts the ship to a certain height, and stably positions the ship, facilitating dredging construction.

[0065] The positioning device hydraulic system comprises a positioning device control valve group, a positioning hydraulic oil cylinder 1 9.9 for driving the left front balancer to act, a positioning hydraulic oil cylinder 2 19.10 for driving the right front balancer to act, a positioning hydraulic oil cylinder 3 19.11 for driving the left rear steel pile lifting device to act, a positioning hydraulic oil cylinder 4 19.12 for driving the right rear steel pile lifting device to act, a positioning hydraulic oil cylinder 5 19.13 for driving the left rear steel pile dumping device to act, a positioning hydraulic oil cylinder 6 19.14 for driving the right rear steel pile dumping device to act, and a positioning hydraulic oil cylinder 7 19.15 for driving the propeller extension device to act. The outlet of the hydraulic pump 2 7.2 is connected with the rod cavity and the rodless cavity of each positioning hydraulic oil cylinder through the positioning device control valve group, and the oil return pipe T2 of the positioning device control valve group is connected with the inlet of the cooler 15 on the oil return main pipe T.

[0066] The positioning device control valve group includes multi-way valve control valve group two 17.1, balance valve four 24.4, balance valve five 24.5, balance valve six 24.6, balance valve seven 24.7, balance valve eight 24.8, balance valve nine 24.9, balance valve ten 24.10, balance valve eleven 24.11, balance valve twelve 24.12, balance valve thirteen 24.13, one-way throttle valve four 25.4, one-way throttle valve five 25.5, one-way throttle valve six 25.6, one-way throttle valve seven 25.7, one-way throttle valve eight 25.8, one-way throttle valve nine 25.9, one-way throttle valve ten 25.10, one-way throttle valve eleven 25.11, one-way throttle valve twelve 25.12, one-way throttle valve thirteen 25.13, hydraulic control one-way valve 31, the multi-way valve control valve group two 17.1 includes positioning proportional directional valve one 18.8, positioning proportional directional valve two 18.9, positioning proportional directional valve three 18.10, positioning proportional directional valve four 18.11, positioning proportional directional valve five 18.12, positioning proportional directional valve six 18.13, positioning proportional directional valve seven 18.14, overflow valve one 10.6, speed regulating valve one 9.1.

[0067] The outlet of the hydraulic pump two 7.2 is connected to the P port of the positioning proportional directional valve one 18.8, the A port of the positioning proportional directional valve one 18.8 is connected to the rod cavity of the positioning hydraulic cylinder one 19.9 through the balance valve four 24.4 and the one-way throttle valve four 25.4 in turn, the B port of the positioning proportional directional valve one 18.8 is connected to the rodless cavity of the positioning hydraulic cylinder one 19.9 through the balance valve five 24.5 and the one-way throttle valve five 25.5 in turn, the control oil way of the balance valve four 24.4 is connected to the rod cavity side of the positioning hydraulic cylinder one 19.9 through the damping hole, and the control oil way of the balance valve five 24.5 is connected to the rod cavity side of the positioning hydraulic cylinder one 19.9 through the damping hole.

[0068] The outlet of the hydraulic pump two 7.2 is connected to the P port of the positioning proportional directional valve two 18.9, the A port of the positioning proportional directional valve two 18.9 is connected to the rod cavity of the positioning hydraulic cylinder two 19.10 through the balance valve six 24.6 and the one-way throttle valve six 25.6 in turn, the B port of the positioning proportional directional valve two 18.9 is connected to the rodless cavity of the positioning hydraulic cylinder two 19.10 through the balance valve seven 24.7 and the one-way throttle valve seven 25.7 in turn, the control oil way of the balance valve six 24.6 is connected to the rod cavity side of the positioning hydraulic cylinder two 19.10 through the damping hole, and the control oil way of the balance valve seven 24.7 is connected to the rod cavity side of the positioning hydraulic cylinder two 19.10 through the damping hole.

[0069] The outlet of the hydraulic pump two 7.2 is connected to the P port of the positioning proportional directional valve three 18.10, the A port of the positioning proportional directional valve three 18.10 is connected to the rod cavity of the positioning hydraulic oil cylinder three 19.11 through the balance valve eight 24.8 and the one-way throttle valve eight 25.8 in sequence, the B port of the positioning proportional directional valve three 18.10 is connected to the rodless cavity of the positioning hydraulic oil cylinder three 19.11 through the balance valve nine 24.9 and the one-way throttle valve nine 25.9 in sequence, the control oil way of the balance valve eight 24.8 is connected to the rod cavity side of the positioning hydraulic oil cylinder three 19.11 through a damping hole, and the control oil way of the balance valve nine 24.9 is connected to the rod cavity side of the positioning hydraulic oil cylinder three 19.11 through a damping hole;

[0070] The outlet of the hydraulic pump two 7.2 is connected to the P port of the positioning proportional directional valve four 18.11, the A port of the positioning proportional directional valve four 18.11 is connected to the rod cavity of the positioning hydraulic oil cylinder four 19.12 through the balance valve ten 24.10 and the one-way throttle valve ten 25.10 in sequence, the B port of the positioning proportional directional valve four 18.11 is connected to the rodless cavity of the positioning hydraulic oil cylinder four 19.12 through the balance valve eleven 24.11 and the one-way throttle valve eleven 25.11 in sequence, the control oil way of the balance valve ten 24.10 is connected to the rod cavity side of the positioning hydraulic oil cylinder four 19.12 through a damping hole, and the control oil way of the balance valve eleven 24.11 is connected to the rod cavity side of the positioning hydraulic oil cylinder four 19.12 through a damping hole;

[0071] The outlet of the hydraulic pump two 7.2 is connected to the P port of the positioning proportional directional valve five 18.12, the A port of the positioning proportional directional valve five 18.12 is connected to the rod cavity of the positioning hydraulic oil cylinder five 19.13, the B port of the positioning proportional directional valve five 18.12 is connected to the rodless cavity of the positioning hydraulic oil cylinder five 19.13 through the balance valve twelve 24.12 and the one-way throttle valve twelve 25.12 in sequence, and the control oil way of the balance valve twelve 24.12 is connected to the rod cavity side of the positioning hydraulic oil cylinder five 19.13 through a damping hole;

[0072] The outlet of the hydraulic pump two 7.2 is connected to the P port of the positioning proportional directional valve six 18.13, the A port of the positioning proportional directional valve six 18.13 is connected to the rod cavity of the positioning hydraulic oil cylinder six 19.14, the B port of the positioning proportional directional valve six 18.13 is connected to the rodless cavity of the positioning hydraulic oil cylinder six 19.14 through the balance valve thirteen 24.13 and the one-way throttle valve thirteen 25.13 in sequence, and the control oil way of the balance valve thirteen 24.13 is connected to the rod cavity side of the positioning hydraulic oil cylinder six 19.14 through a damping hole;

[0073] The outlet of the hydraulic pump 7.2 is connected to the P port of the positioning proportional directional valve 7 18.14, the A port of the positioning proportional directional valve 7 18.14 is connected to the rod cavity of the positioning hydraulic cylinder 7 19.15 through the hydraulic control check valve 31, the B port of the positioning proportional directional valve 7 18.14 is connected to the rodless cavity of the positioning hydraulic cylinder 7 19.15, and the control oil way of the hydraulic control check valve 31 is connected to the rodless cavity of the positioning hydraulic cylinder 7 19.15;

[0074] The T ports of the positioning proportional directional valve 1 18.8, the positioning proportional directional valve 2 18.9, the positioning proportional directional valve 3 18.10, the positioning proportional directional valve 4 18.11, the positioning proportional directional valve 5 18.12, the positioning proportional directional valve 6 18.13 and the positioning proportional directional valve 7 18.14 are connected to the oil return pipe T2; the inlet of the overflow valve 1 10.6 is connected to the outlet of the hydraulic pump 2 7.2, and the outlet of the overflow valve 1 10.6 is connected to the oil return pipe T2; the speed regulating valve 1 9.1 is arranged on the oil return pipe T2.

[0075] The high-pressure hydraulic oil P2 of the outlet of the hydraulic pump 2 7.2 enters the multi-way valve control valve group 2 17.1, enters each positioning proportional directional valve, enters each balance valve, hydraulic control check valve 31 and other valve groups, and is output into each positioning hydraulic cylinder, and the oil return of each positioning hydraulic cylinder enters the multi-way valve control valve group 2 17.1 through the oil return pipe T2, the cooler 15 and the total oil return filter 16.1, and returns to the oil tank 1.

[0076] The power source emergency and alternative system includes the check valve 1 28.1, the check valve 2 28.2, the check valve 3 28.3, the check valve 4 28.4, the check valve 5 28.5, the control shuttle valve 1 29.1, the control shuttle valve 2 29.2, the electromagnetic valve 1 30.1 and the electromagnetic valve 2 30.2; the check valve 3 28.3 is arranged on the outlet oil way of the hydraulic pump 1 7.1, the check valve 2 28.2 is arranged on the outlet oil way of the hydraulic pump 2 7.2, and the check valve 1 28.1 is arranged on the outlet oil way of the hydraulic pump 3 7.3.

[0077] The B port of the check valve 1 28.1 is connected to the A port of the control shuttle valve 1 29.1 and the A port of the check valve 4 28.4, the B port of the control shuttle valve 1 29.1 is connected to the outlet oil way of the hydraulic pump 2 7.2, the C port of the control shuttle valve 1 29.1 is connected to the P port of the electromagnetic valve 1 30.1 through a damping hole, the A port of the electromagnetic valve 1 30.1 is connected to the X cavity of the check valve 4 28.4 through a damping hole, the T port of the electromagnetic valve 1 30.1 is connected to the oil return pipe T5, and the B port of the check valve 4 28.4 is connected to the outlet oil way of the hydraulic pump 2 7.2.

[0078] The B port of the one-way plug-in valve three 28.3 is connected to the B port of the control shuttle valve two 29.2 and the A port of the plug-in valve five 28.5 respectively, the A port of the control shuttle valve two 29.2 is connected to the outlet oil way of the hydraulic pump two 7.2, the C port of the control shuttle valve two 29.2 is connected to the P port of the electromagnetic valve two 30.2 through a damping hole, the A port of the electromagnetic valve two 30.2 is connected to the X cavity of the plug-in valve five 28.5 through a damping hole, the T port of the electromagnetic valve two 30.2 is connected to the return oil pipe T5, the B port of the plug-in valve five 28.5 is connected to the outlet oil way of the hydraulic pump two 7.2; the return oil pipe T5 is connected to the inlet of the cooler 15 of the return oil main pipe T.

[0079] The high-pressure hydraulic oil P1, P2, P3 output by the hydraulic pump one 7.1, the hydraulic pump two 7.2 and the hydraulic pump three 7.3 enters the one-way plug-in valve, and the conversion between P1, P2 and P3 is realized through the control shuttle valve and the electromagnetic plug-in valve (electromagnetic valve and plug-in valve), and the return oil T5 of the electromagnetic plug-in valve returns to the oil tank 1 through the cooler 15 and the total return oil filter 16.1.

[0080] The cooling energy-saving control system comprises a one-way valve three 11.3, a one-way valve four 11.4, a one-way valve five 11.5, a pressure reducing valve 20, a high-pressure oil filter 16.2, a proportional speed regulating valve 21, a fan hydraulic motor 13.4, a cooling fan 23, a cooler 15, a stop valve one 8.2, an energy accumulator 22 and a safety valve five 10.8, the outlet of the hydraulic pump three 7.3 is connected to the inlet of the pressure reducing valve 20 through the one-way valve three 11.3, the outlet of the hydraulic pump two 7.2 is connected to the inlet of the pressure reducing valve 20 through the one-way valve four 11.4, the outlet of the hydraulic pump one 7.1 is connected to the inlet of the pressure reducing valve 20 through the one-way valve five 11.5, the outlet of the pressure reducing valve 20 is connected to the inlet of the high-pressure oil filter 16.2, the outlet of the high-pressure oil filter 16.2 is connected to the inlet of the proportional speed regulating valve 21, the outlet of the proportional speed regulating valve 21 is connected to the inlet of the fan hydraulic motor 13.4, the outlet of the fan hydraulic motor 13.4 is connected to the return oil pipe T4, the fan hydraulic motor 13.4 drives the cooling fan 23 to rotate, and the cooling fan 23 provides cooling air for the cooler 15; the outlet of the high-pressure oil filter 16.2 is connected to the energy accumulator 22 through the stop valve one 8.2, and the energy accumulator 22 is connected to the return oil pipe T4 through the safety valve five 10.8; the return oil pipes T5, T1, T2 and T3 of the power source emergency and alternative system, the conveying device hydraulic system, the positioning device hydraulic system and the dredging device hydraulic system are all connected to the inlet of the cooler 15, and the outlet of the cooler 15 is connected to the return oil pipe T4. A stop valve two 8.3 is further arranged on the return oil way of the energy accumulator 22, and the stop valve two 8.3 is connected in parallel with the safety valve five 10.8.

[0081] The high-pressure hydraulic oil P1, P2, and P3 output by the hydraulic pump enters the check valve, passes through the pressure reducing valve 20 and the high-pressure oil filter 16.2, and then enters the accumulator 22. The high-pressure oil in the accumulator 22 then enters the fan hydraulic motor 13.4 through the proportional speed control valve 21 to drive the cooling fan 23 for cooling. The return oil from the fan hydraulic motor 13.4 returns to the oil tank 1 through the main return oil filter 16.1.

[0082] like Figure 8 , Figure 9 As shown, the underwater pump is driven by the underwater pump hydraulic motor 13.1, the thruster is driven by the thruster hydraulic motor 13.2, the cutter head is driven by the cutter head hydraulic motor 13.3, and the cooling fan 23 is driven by the fan hydraulic motor 13.4; the excavator boom is driven by dredging hydraulic cylinders 19.1 and 19.2, the grab bucket is driven by dredging hydraulic cylinders 19.3 and 19.4, the boom of the excavator boom is driven by dredging hydraulic cylinder 19.5, and the arm of the excavator boom is driven by dredging hydraulic cylinder 19.5. The device is driven by hydraulic cylinder 6 (19.6), the bucket by hydraulic cylinder 7 (19.7), the pile gripper by hydraulic cylinder 8 (19.8), the front balancer by hydraulic cylinders 1 (19.9) and 2 (19.10), the rear pile lifting device by hydraulic cylinders 3 (19.11) and 4 (19.12), the rear pile tilting device by hydraulic cylinders 5 (19.13) and 6 (19.14), and the thruster extension device by hydraulic cylinder 7 (19.15).

[0083] The following is combined with Figures 1-7 The specific actions of each system are explained below:

[0084] Power source hydraulic system:

[0085] Hydraulic pump 1 (7.1), hydraulic pump 2 (7.2), and hydraulic pump 3 (7.3) are driven by a diesel engine to draw hydraulic oil from oil tank 1. The hydraulic oil passes through low-pressure oil filter 2 and suction butterfly valve 8.1, and is then discharged as high-pressure hydraulic oil P1, P2, and P3 by hydraulic pump 1 (7.1), hydraulic pump 2 (7.2), and hydraulic pump 3 (7.3) respectively. The system return oil T1+T2+T3+T5 merges and passes through cooler 15 to become T4, and then passes through main return oil filter 16.1 back to oil tank 1.

[0086] Hydraulic system of conveying device:

[0087] The high pressure hydraulic oil P1 of the hydraulic pump 7.1 enters the A, B ports of the delivery proportional directional valve 12.1 through the check valve 11.1 and is outputted to the underwater pump hydraulic motor 13.1 to drive the underwater pump. When S1 and RS1 are electrified, the high pressure oil P1 is discharged from the A port through the check valve 11.1 and the delivery proportional directional valve 12.1 and enters the underwater pump hydraulic motor 13.1 to drive the underwater pump to rotate in the positive direction to perform the suction work. When S1 and RS2 are electrified, the high pressure oil P1 is discharged from the B port and enters the underwater pump hydraulic motor 13.1 to drive the underwater pump to rotate in the reverse direction to perform the maintenance work. The outlet of the safety valve 10.2, the outlet of the safety valve 10.3 and the outlet of the electromagnetic overflow valve group 10.1 pass through the cooler 15 and the total oil return filter 16.1 to return to the oil tank 1.

[0088] The high pressure hydraulic oil P1 of the hydraulic pump 7.1 enters the A, B ports of the delivery proportional directional valve 12.1 through the check valve 11.1 and is outputted to the underwater pump hydraulic motor 13.1 to drive the underwater pump. When S1 and RS1 are electrified, the high pressure oil P1 is discharged from the A port through the check valve 11.1 and the delivery proportional directional valve 12.1 and enters the underwater pump hydraulic motor 13.1 to drive the underwater pump to rotate in the positive direction to perform the suction work. When S1 and RS2 are electrified, the high pressure oil P1 is discharged from the B port and enters the underwater pump hydraulic motor 13.1 to drive the underwater pump to rotate in the reverse direction to perform the maintenance work. The outlet of the safety valve 10.2, the outlet of the safety valve 10.3 and the outlet of the electromagnetic overflow valve group 10.1 pass through the cooler 15 and the total oil return filter 16.1 to return to the oil tank 1.

[0089] Hydraulic system of the dredging device:

[0090] The high pressure hydraulic oil P3 of the hydraulic pump 7.3 enters the multi-way valve control valve group 17.2 and enters each dredging proportional directional valve. When RS5 is electrified, the high pressure oil is outputted from the A port, enters the rod cavity of the dredging hydraulic cylinder 19.1 and the rodless cavity of the dredging hydraulic cylinder 19.2, and the excavator arm rotates to the left. When RS6 is electrified, the high pressure oil is outputted from the B port, enters the rodless cavity of the dredging hydraulic cylinder 19.1 and the rod cavity of the dredging hydraulic cylinder 19.2, and the excavator arm rotates to the right. The action principles of other execution elements are similar, including the dredging hydraulic cylinder 5 19.5 for the large arm lifting, the dredging hydraulic cylinder 6 19.6 for the small arm lifting, the dredging hydraulic cylinder 7 19.7 for the bucket lifting, the dredging hydraulic cylinder 8 19.8 for the pile gripper action, the dredging hydraulic cylinder 3 19.3 and the dredging hydraulic cylinder 4 19.4 for the grab action, and the reamer hydraulic motor 13.3 for the reamer action.

[0091] Hydraulic system of the positioning device:

[0092] The high-pressure hydraulic oil P2 of the hydraulic pump two 7.2 enters the multi-way valve control valve group two 17.1, and enters each positioning proportional directional valve respectively. When RS19 is powered, the high-pressure oil is output from the A port, enters the rod cavity of the positioning hydraulic cylinder one 19.9 of the left front balancer, and the back oil of the rodless cavity passes through the one-way throttle valve five 25.5 and the balance valve five 24.5, and then returns to the multi-way valve control valve group two 17.1 through the B port, so that the left front balancer is retracted. When RS20 is powered, the high-pressure oil is output from the B port, enters the rodless cavity of the positioning hydraulic cylinder one 19.9 of the left front balancer, and the back oil of the rod cavity passes through the one-way throttle valve four 25.4 and the balance valve four 24.4, and then returns to the multi-way valve control valve group two 17.1 through the A port, so that the left front balancer is extended. The action principles of other execution elements are similar, including the positioning hydraulic cylinder two 19.10 of the right front balancer, the positioning hydraulic cylinder three 19.11 of the left rear steel pile lifting device, the positioning hydraulic cylinder four 19.12 of the right rear steel pile lifting device, the positioning hydraulic cylinder five 19.13 of the left rear steel pile tilting device, the positioning hydraulic cylinder six 19.14 of the right rear steel pile tilting device, and the positioning hydraulic cylinder seven 19.15 of the pusher extending device.

[0093] Power source emergency and replacement system:

[0094] The high-pressure hydraulic oils P1, P2 and P3 output by the hydraulic pump one 7.1, the hydraulic pump two 7.2 and the hydraulic pump three 7.3 enter the one-way cartridge valve three 28.3, the one-way cartridge valve two 28.2 and the one-way cartridge valve one 28.1 respectively, and the conversion between P1, P2 and P3 is realized through the cartridge valve four 28.4, the cartridge valve five 28.5, the control spool valve one 29.1, the control spool valve two 29.2, the electromagnetic valve one 30.1 and the electromagnetic cartridge valve two 30.2. The back oil T5 of the electromagnetic cartridge valve returns to the oil tank 1 through the cooler 15 and the total back oil filter 16.1.

[0095] Working condition one: the PLC logic controller judges that the ship is only in the backhoe dredging operation, the grab dredging operation or the piling operation, the high-pressure hydraulic oil P1 of the hydraulic pump one 7.1 enters the one-way cartridge valve three 28.3, and then P1 is combined with P2 through the electromagnetic cartridge valve two S46. The high-pressure hydraulic oil P2 of the hydraulic pump two 7.2 enters the one-way cartridge valve two 28.2, and then P2+P1 is combined with P3 through the electromagnetic cartridge valve one S45. After P2+P1 and P3 are combined, the combined oil is supplied to the hydraulic system of the excavator arm and other dredging devices to speed up the dredging speed and improve the construction efficiency.

[0096] Working condition two: the PLC logic controller judges that only the pusher is working, and the pump source P3 supplied to the dredging device and the pump source P2 supplied to the positioning device are combined with P1 to push the propeller and improve the ship propulsion speed.

[0097] When other systems have action command, PLC logic controller disconnects the valve of the pump, and makes each system restore the independent running state.

[0098] Cooling energy-saving control system:

[0099] The high-pressure hydraulic oil P1, P2, P3 output by the hydraulic pump 7.1, hydraulic pump 7.2, hydraulic pump 7.3 enters the check valve 11.3, check valve 11.4, check valve 11.5, then passes through the pressure reducing valve 20 and the high-pressure oil filter 16.2, and then enters the accumulator 22 through the stop valve 8.2 for storage. When the high-pressure oil of the accumulator 22 is working, it passes through the stop valve 8.2 and then passes through the proportional speed regulating valve 21 to enter the fan hydraulic motor 13.4 to drive the cooling fan 23 to cool. The oil return T4 of the fan hydraulic motor 13.4 returns to the oil tank 1 through the total oil return filter 16.1. The safety valve 10.8 is a safety protection device of the accumulator. When the pressure of the accumulator is greater than the set value of the safety valve 10.8, the safety valve 10.8 overflows the hydraulic oil to keep the pressure from rising and ensure the safety of the accumulator 22. The stop valve 8.3 is normally closed. Only when the accumulator needs to be repaired or replaced, the stop valve 8.2 is closed and the stop valve 8.3 is opened to drain the high-pressure oil of the accumulator 22 to the oil tank 1, so that the accumulator can be disassembled and inspected.

[0100] The following three kinds of adjustment logic are programmed into the PLC logic controller. The PLC logic controller makes corresponding command execution according to the oil temperature value monitored by the temperature sensor 32.

[0101] Automatic adjustment logic one: when the system monitors the oil temperature below 35℃ through the temperature sensor 32, the RS33 of the proportional speed regulating valve 21 is adjusted to close the proportional speed regulating valve 21, so that the fan hydraulic motor 13.4 does not rotate and does not drive the cooling fan 23, thereby saving energy.

[0102] Automatic adjustment logic two: when the system monitors the oil temperature between 35℃ and 50℃ through the temperature sensor 32, the RS33 of the proportional speed regulating valve 21 is adjusted to increase the opening of the proportional speed regulating valve 21 to half, so that the fan hydraulic motor 13.4 rotates at low speed to drive the cooling fan 23, thereby saving energy.

[0103] Automatic adjustment logic three: when the system monitors the oil temperature above 50℃ through the temperature sensor 32, the RS33 of the proportional speed regulating valve 21 is adjusted to increase the opening of the proportional speed regulating valve 21 to full, so that the fan hydraulic motor 13.4 rotates at high speed to drive the cooling fan 23 to cool.

[0104] After the system monitors that the oil temperature decreases to the normal set value through the temperature sensor 32, the opening of the proportional speed regulating valve 21 is automatically adjusted to reduce the rotating speed of the fan hydraulic motor 13.4.

[0105] It should be noted that the above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some or all of the technical features can be replaced by equivalents, and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A cooling and energy-saving hydraulic system for multifunctional dredging equipment, characterized in that: It includes a power source hydraulic system, a power source emergency and alternative system, a cooling and energy-saving control system, a conveying device hydraulic system, a positioning device hydraulic system, and a dredging device hydraulic system. The power source hydraulic system is connected to the conveying device hydraulic system, the positioning device hydraulic system, and the dredging device hydraulic system respectively through the power source emergency and alternative system. The power source hydraulic system includes hydraulic pump one, hydraulic pump two, hydraulic pump three, oil tank, return oil main pipe T, and temperature sensor. The suction ports of hydraulic pump one, hydraulic pump two, and hydraulic pump three are connected to the outlet of the oil tank. The outlets of hydraulic pump one, hydraulic pump two, and hydraulic pump three are respectively connected to the hydraulic system of each actuator. The return oil main pipe T is connected to the return oil port of the oil tank. The temperature sensor is installed at the bottom of the oil tank. The power source emergency and replacement system includes one-way cartridge valve 1, one-way cartridge valve 2, one-way cartridge valve 3, cartridge valve 4, cartridge valve 5, control shuttle valve 1, control shuttle valve 2, solenoid valve 1, and solenoid valve 2. One-way cartridge valve 3 is installed on the outlet oil line of hydraulic pump 1, one-way cartridge valve 2 is installed on the outlet oil line of hydraulic pump 2, and one-way cartridge valve 1 is installed on the outlet oil line of hydraulic pump 3. Port B of one-way cartridge valve 1 is connected to port A of control shuttle valve 1 and port A of cartridge valve 4, respectively. Port B of control shuttle valve 1 is connected to the outlet oil line of hydraulic pump 2. Port C of control shuttle valve 1 is connected to port P of solenoid valve 1 through a damping orifice. Port A of the solenoid valve is connected to the X chamber of cartridge valve four via a damping orifice; port T of solenoid valve one is connected to the return oil pipe T5; port B of cartridge valve four is connected to the outlet oil circuit of hydraulic pump two; port B of the one-way cartridge valve three is connected to port B of control shuttle valve two and port A of cartridge valve five respectively; port A of control shuttle valve two is connected to the outlet oil circuit of hydraulic pump two; port C of control shuttle valve two is connected to port P of solenoid valve two via a damping orifice; port A of solenoid valve two is connected to the X chamber of cartridge valve five via a damping orifice; port T of solenoid valve two is connected to the return oil pipe T5; port B of cartridge valve five is connected to the outlet oil circuit of hydraulic pump two; return oil pipe T5 is connected to the inlet of the cooler on the return oil main pipe T. The cooling and energy-saving control system includes check valve three, check valve four, check valve five, pressure reducing valve, high-pressure oil filter, proportional speed control valve, fan hydraulic motor, cooling fan, cooler, shut-off valve one, accumulator, and safety valve five. The outlet of hydraulic pump three is connected to the inlet of pressure reducing valve through check valve three. The outlet of hydraulic pump two is connected to the inlet of pressure reducing valve through check valve four. The outlet of hydraulic pump one is connected to the inlet of pressure reducing valve through check valve five. The outlet of pressure reducing valve is connected to the inlet of high-pressure oil filter. The outlet of high-pressure oil filter is connected to the inlet of proportional speed control valve. The outlet of proportional speed control valve is connected to... The fan hydraulic motor inlet is connected to the fan hydraulic motor outlet, which is connected to the return oil pipe T4. The fan hydraulic motor drives the cooling fan to rotate, and the cooling fan provides cooling air to the cooler. The high-pressure oil filter outlet is connected to the accumulator through a shut-off valve, and the accumulator is connected to the return oil pipe T4 through a safety valve. The return oil pipes T5 of the power source emergency and replacement system, T1 of the conveying device hydraulic system, T2 of the positioning device hydraulic system, and T3 of the dredging device hydraulic system are all connected to the cooler inlet, and the cooler outlet is connected to the return oil pipe T4. The outlet of the hydraulic pump one drives the conveying device to operate through the hydraulic system of the conveying device; The outlet of the second hydraulic pump drives the positioning device through the hydraulic system of the positioning device, so that the ship is positioned stably, which facilitates dredging operations. The outlet of the hydraulic pump three drives the dredging device to operate through the hydraulic system of the dredging device, thereby completing the dredging. The cooler and the main return oil filter are sequentially installed along the return oil direction in the main return oil pipe T, so that the return oil passes through the cooler and the main return oil filter and returns to the oil tank; The hydraulic system of the conveying device includes a conveying device control valve group, an underwater pump hydraulic motor for driving the underwater pump to suck up mud and discharge it under high pressure, and a propeller hydraulic motor for driving the propeller so that the multi-functional environmentally friendly dredger can propel itself on the water surface; the outlet of the first hydraulic pump is connected to the A1 and B1 ports of the underwater pump hydraulic motor and the A1 and B1 ports of the propeller hydraulic motor respectively through the conveying device control valve group, and the return oil pipe T1 of the conveying device control valve group is connected to the inlet of the cooler on the return oil main pipe T.

2. The cooling and energy-saving hydraulic system of the multifunctional dredging equipment according to claim 1, characterized in that, Hydraulic pump one, hydraulic pump two, and hydraulic pump three are driven by a diesel engine. The suction ports of hydraulic pump one, hydraulic pump two, and hydraulic pump three are connected to the outlet of the oil tank through suction port butterfly valves.

3. The cooling and energy-saving hydraulic system of the multifunctional dredging equipment according to claim 1, characterized in that, The oil tank is equipped with a low-pressure oil filter, an air filter, an oil temperature alarm, a high liquid level alarm, a low liquid level alarm, and a liquid level gauge. The low-pressure oil filter is installed at the outlet of the oil tank. The air filter and the oil temperature alarm are installed at the top of the oil tank. The oil temperature alarm extends below the oil surface. The high liquid level alarm and the low liquid level alarm are installed at the high liquid level and low liquid level positions on the side wall of the oil tank, respectively. The liquid level gauge is installed on one side of the side wall of the oil tank.

4. The cooling and energy-saving hydraulic system of the multifunctional dredging equipment according to claim 1, characterized in that, The control valve group of the conveying device includes an electromagnetic overflow valve group, a first check valve, a second check valve, a first conveying proportional directional valve, a second conveying proportional directional valve, and four safety valves. The outlet of the first hydraulic pump is connected to the P port of the first conveying proportional directional valve via the first check valve. The A port of the first conveying proportional directional valve is connected to the A1 port of the underwater pump hydraulic motor, and the B port of the first conveying proportional directional valve is connected to the B1 port of the underwater pump hydraulic motor. The outlet of the first hydraulic pump is connected to the P port of the second conveying proportional directional valve via the second check valve, and the A port of the second conveying proportional directional valve is connected to… The A1 port of the thruster hydraulic motor is connected to the B port of the delivery proportional directional valve two; the inlet of the electromagnetic relief valve group is connected to the inlet of check valve one and the inlet of check valve two respectively; the outlet of the electromagnetic relief valve group, the T port of delivery proportional directional valve one, and the T port of delivery proportional directional valve two are all connected to the return oil pipe T1; the A1 and B1 ports of the underwater pump hydraulic motor and the A1 and B1 ports of the thruster hydraulic motor are each connected to one end of a safety valve, and the other ends of the four safety valves are all connected to the return oil pipe T1.

5. The cooling and energy-saving hydraulic system of the multifunctional dredging equipment according to claim 1, characterized in that, The hydraulic system of the dredging device includes a dredging device control valve group, a cutter hydraulic motor for driving the cutter to cut underwater mud so that it can be sucked away by the underwater pump, and multiple dredging hydraulic cylinders for driving the excavator arm to complete the dredging action. The outlet of the hydraulic pump three is connected to the A1 and B1 ports of the cutter hydraulic motor and the rod chamber and rodless chamber of each dredging hydraulic cylinder through the dredging device control valve group. The return oil pipe T3 of the dredging device control valve group is connected to the inlet of the cooler on the return oil main pipe T.

6. The cooling and energy-saving hydraulic system of the multifunctional dredging equipment according to claim 1, characterized in that, The hydraulic system of the positioning device includes a positioning device control valve group, a positioning hydraulic cylinder one for driving the left front balancer, a positioning hydraulic cylinder two for driving the right front balancer, a positioning hydraulic cylinder three for driving the left rear steel pile lifting device, a positioning hydraulic cylinder four for driving the right rear steel pile lifting device, a positioning hydraulic cylinder five for driving the left rear steel pile tilting device, a positioning hydraulic cylinder six for driving the right rear steel pile tilting device, and a positioning hydraulic cylinder seven for driving the thruster extension device. The outlet of the hydraulic pump two is connected to the rod chamber and rodless chamber of each positioning hydraulic cylinder through the positioning device control valve group. The return oil pipe T2 of the positioning device control valve group is connected to the inlet of the cooler on the return oil main pipe T.

7. The cooling and energy-saving hydraulic system of the multifunctional dredging equipment according to claim 1, characterized in that, The accumulator is also equipped with a shut-off valve two on the return oil line, and the shut-off valve two is connected in parallel with the safety valve five.

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