Hydraulic system of a trial bed for dredging equipment

Abstract

The application discloses a kind of hydraulic systems of dredging equipment test bench, including power source hydraulic system, test machine position adjustment hydraulic system, cutting and conveying device hydraulic system, oil filtering and monitoring hydraulic system, power source hydraulic system is connected with test machine position adjustment hydraulic system, cutting and conveying device hydraulic system, oil filtering and monitoring hydraulic system respectively;Test machine position adjustment hydraulic system is used to drive corresponding hydraulic cylinder action adjustment test machine lift, left and right movement, test machine position locking and the angle of rake head cover and the angle of auger bit;Cutting and conveying device hydraulic system is used to drive corresponding hydraulic motor to drive test bench, auger bit and mud pump, realize excavating silt and conveying silt;Oil filtering and monitoring hydraulic system is used to filter oil, reciprocating cycle, reach the purpose of clean oil, and is equipped with oil cleanliness on-line detector, real-time monitoring to oil cleanliness, and alarm prompt when cleanliness reduces to set value.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of dredging equipment, more particularly, to a kind of hydraulic system of dredging equipment test bench. BACKGROUND

[0002] There are various kinds of dredging equipment, mainly including cutter suction dredger, drag suction dredger, chain bucket dredger, shovel dredger and grab dredger, and various dredgers are equipped with multiple types of dredging tools to adapt to different soil conditions.For example, different types of cutter heads and cutter teeth are needed for cutter suction dredgers to deal with different soil conditions such as silt, clay and hard rock, which requires excavation tests of cutter teeth for different conditions.Dredging equipment test bench is an important tool for adaptability tests of various dredging tools for different soil conditions, and the reliability and stability of the test bench are the basic guarantee for the authenticity of test results.

[0003] Currently, there are several dredging equipment test benches in domestic dredging companies, but the existing test bench hydraulic systems have the following problems: first, the functions are single, no spare interface is left, other dredging equipment cannot be directly connected, and the hydraulic components cannot be functionally tested, pressure tested and leakage tested;Second, the control points and monitoring points of the system are few, there is no oil temperature and liquid level monitoring, the modernization degree is low, the pressure and flow of each system cannot be remotely controlled and real-time monitored, which is not conducive to test data setting and collection;Third, there is no oil filtration and monitoring system, the cleanliness of the test bench oil cannot be monitored in real time, which is not conducive to equipment safety;Fourth, the hydraulic system is air-cooled, and the cooling effect is not good in high temperature environment, which cannot effectively reduce the oil temperature. SUMMARY

[0004] In order to solve the problems existing in the prior art, the present application provides a dredging equipment test bench hydraulic system with complete functions, reliability and stability, which includes a power source hydraulic system, a test machine position adjustment hydraulic system, a cutting and conveying device hydraulic system and an oil filtration and monitoring hydraulic system.The test machine position adjustment hydraulic system is used to drive the corresponding hydraulic cylinder to act to adjust the lifting, left and right movement of the test machine, the locking of the test machine position and the angle of the rake head cover and the angle of the cutter.The cutting and conveying device hydraulic system is used to drive the corresponding hydraulic motor to drive the test bench, the cutter and the mud pump, to realize the functions of excavating and conveying mud.The oil filtration and monitoring hydraulic system is used to filter the oil through the filter back to the oil tank, then draw it out from the oil tank for filtration again, and circulate back and forth to achieve the purpose of cleaning the oil, and is equipped with an online oil cleanliness detector to monitor the oil cleanliness in real time, and alarm when the cleanliness decreases to the set value.

[0005] The application is achieved by a hydraulic system of a dredging equipment test bed, which comprises a power source hydraulic system, a test machine position adjustment hydraulic system, a cutting and conveying device hydraulic system and an oil filtering and monitoring hydraulic system, wherein the power source hydraulic system is connected with the test machine position adjustment hydraulic system, the cutting and conveying device hydraulic system and the oil filtering and monitoring hydraulic system respectively;

[0006] The power source hydraulic system comprises hydraulic pump one, hydraulic pump two, hydraulic pump three, hydraulic pump four, an oil tank and an oil return main pipe T, the suction ports of the hydraulic pump one, the hydraulic pump two, the hydraulic pump three and the hydraulic pump four are connected with the outlet of the oil tank, the outlets of the hydraulic pump one, the hydraulic pump two, the hydraulic pump three and the hydraulic pump four are connected with the test machine position adjustment hydraulic system and the cutting and conveying device hydraulic system respectively, the outlet pipelines of the hydraulic pump one, the hydraulic pump two, the hydraulic pump three and the hydraulic pump four are respectively provided with a power source pressure sensor and a flow meter, the outlet pipelines of the hydraulic pump one, the hydraulic pump two, the hydraulic pump three and the hydraulic pump four are respectively provided with a power source overflow branch, each power source overflow branch is connected with the oil return main pipe T, and the oil return main pipe T is connected with the oil return port of the oil tank.

[0007] The outlet of the hydraulic pump one drives the position adjustment device to act through the test machine position adjustment hydraulic system, so as to adjust the lifting, left and right movement of the test machine, the locking of the test machine position and the angles of the rake head cover and the reamer.

[0008] The outlets of the hydraulic pump two, the hydraulic pump three and the hydraulic pump four drive the cutting and conveying device to act through the cutting and conveying device hydraulic system, so as to realize the excavation and conveying of the silt.

[0009] The cutting and conveying device hydraulic system is provided with a plurality of equipment standby interfaces, and a stop valve is arranged on the oil return pipeline of each equipment standby interface.

[0010] The outlet pipeline of the hydraulic pump one and the outlet pipeline of the hydraulic pump four are connected through a parallel pump valve group.

[0011] The oil filtering and monitoring hydraulic system comprises an oil filtering pipeline, the inlet of the oil filtering pipeline is connected with the outlet of the oil tank, the outlet of the oil filtering pipeline is connected with the oil return port of the oil tank, and the oil filtering pipeline is sequentially provided with a hydraulic pump five, a filtering pipeline pressure sensor, a filtering pipeline high-pressure oil filter, a cleanliness online detector and a filtering pipeline check valve.

[0012] Preferably, the outlet pipelines of the hydraulic pump one, the hydraulic pump two, the hydraulic pump three and the hydraulic pump four are sequentially provided with a power source high-pressure oil filter, a power source check valve, a proportional speed regulating valve, a power source pressure sensor and a flow meter respectively, and each power source overflow branch is provided with a proportional overflow valve.

[0013] Preferably, the hydraulic pump one, hydraulic pump two, hydraulic pump three and hydraulic pump four are driven by an electric motor, the suction port of the hydraulic pump one, hydraulic pump two, hydraulic pump three and hydraulic pump four are connected to the outlet of the oil tank in turn through a power source low pressure oil filter and a power source suction port butterfly valve, and the oil return main pipe T is provided with a water-cooled cooler and a total oil return filter in turn along the oil return direction, so that the oil returns to the oil tank after passing through the water-cooled cooler and the total oil return filter.

[0014] Preferably, the oil tank is provided with a liquid level gauge, an air cleaner, a high liquid level alarm, a low liquid level alarm, an oil temperature alarm and a temperature sensor, the liquid level gauge is installed on one side of the side wall of the oil tank, the air cleaner and the oil temperature alarm are installed on 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 the low liquid level of the side wall of the oil tank respectively, and the temperature sensor is installed at the lower part of the oil tank.

[0015] Preferably, the test machine position adjustment hydraulic system comprises a position adjustment control valve group, a test machine lifting hydraulic oil cylinder for driving the test machine to lift, a test machine lifting locking hydraulic oil cylinder for locking the lifting position of the test machine, a test machine left-right moving hydraulic oil cylinder for driving the test machine to move left and right, a test machine left-right moving locking hydraulic oil cylinder for locking the left-right moving position of the test machine, a rake head cover angle adjustment hydraulic oil cylinder for adjusting the angle of the rake head cover, and a reamer angle adjustment hydraulic oil cylinder for adjusting the angle of the reamer, the outlet of the hydraulic pump one is connected to the rod cavity and the rodless cavity of each hydraulic oil cylinder through the position adjustment control valve group, and the oil return pipe of the position adjustment control valve group is connected to the inlet of the water-cooled cooler of the oil return main pipe T.

[0016] Preferably, the cutting and conveying device hydraulic system comprises a cutting and conveying device control valve group, a test machine walking hydraulic motor for driving the test machine to walk, a mud pump hydraulic motor for driving the mud pump to operate, and a reamer hydraulic motor for driving the reamer to operate, the outlet of the hydraulic pump two is connected to the A and B ports of the test machine walking hydraulic motor through the cutting and conveying device control valve group, the outlet of the hydraulic pump three is connected to the A and B ports of the mud pump hydraulic motor through the cutting and conveying device control valve group, the outlet of the hydraulic pump four is connected to the A and B ports of the reamer hydraulic motor and a plurality of equipment standby interfaces through the cutting and conveying device control valve group, and the oil return pipe of the cutting and conveying device control valve group is connected to the inlet of the water-cooled cooler of the oil return main pipe T.

[0017] Further preferably, the cutting and conveying device control valve group comprises a walking electro-hydraulic reversing valve, a mud pump electro-hydraulic reversing valve, a reamer electro-hydraulic reversing valve and a plurality of standby equipment electro-hydraulic reversing valves, the outlet of the hydraulic pump two is connected to the P port of the walking electro-hydraulic reversing valve, the A port of the walking electro-hydraulic reversing valve is connected to the A port of the walking hydraulic motor of the testing machine, and the B port of the walking electro-hydraulic reversing valve is connected to the B port of the walking hydraulic motor of the testing machine; the outlet of the hydraulic pump three is connected to the P port of the mud pump electro-hydraulic reversing valve, the A port of the mud pump electro-hydraulic reversing valve is connected to the A port of the mud pump hydraulic motor, and the B port of the mud pump electro-hydraulic reversing valve is connected to the B port of the mud pump hydraulic motor; the outlet of the hydraulic pump four is connected to the P port of the reamer electro-hydraulic reversing valve and the P ports of the plurality of standby equipment electro-hydraulic reversing valves, the A port of the reamer electro-hydraulic reversing valve is connected to the A port of the reamer hydraulic motor, the B port of the reamer electro-hydraulic reversing valve is connected to the B port of the reamer hydraulic motor, the A ports of the plurality of standby equipment electro-hydraulic reversing valves are respectively connected to the A ports of the plurality of equipment standby interfaces, and the B ports of the plurality of standby equipment electro-hydraulic reversing valves are respectively connected to the B ports of the plurality of equipment standby interfaces; the T ports of the walking electro-hydraulic reversing valve, the T ports of the mud pump electro-hydraulic reversing valve, the T ports of the reamer electro-hydraulic reversing valve and the T ports of the plurality of standby equipment electro-hydraulic reversing valves are all connected to the oil return pipe of the cutting and conveying device control valve group.

[0018] Still further preferably, the stop valves are respectively arranged on the oil return pipes of the T ports of the plurality of standby equipment electro-hydraulic reversing valves.

[0019] Preferably, the parallel pump valve group comprises a control shuttle valve, a one-way cartridge valve and an electromagnetic cartridge valve, the outlet pipe of the hydraulic pump one is connected to the A port of the control shuttle valve and the A port of the one-way cartridge valve, the B port of the control shuttle valve is connected to the outlet pipe of the hydraulic pump four, the C port of the control shuttle valve is connected to the P port of the electromagnetic cartridge valve through a damping hole, the A port of the electromagnetic cartridge valve is connected to the X cavity of the one-way cartridge valve through a damping hole, and the B port of the one-way cartridge valve is connected to the outlet pipe of the hydraulic pump four.

[0020] Preferably, a filter pipe suction butterfly valve and a filter pipe low-pressure oil filter are arranged in sequence on the oil liquid filtering pipe between the outlet of the oil tank and the hydraulic pump five, an oil liquid filtering pipe is arranged between the hydraulic pump five and the filter pipe pressure sensor, an electromagnetic overflow valve group is arranged on the filter pipe overflow branch, and the filter pipe overflow branch is connected to the oil return port of the oil tank.

[0021] The present application has the following advantages and beneficial effects:

[0022] (1) The hydraulic system of the dredging equipment test bed of the present application leaves a plurality of spare interfaces for equipment, and the return oil pipeline of the spare interface is provided with a stop valve, so that other dredging equipment can be directly connected for test, and various tests can be performed on various hydraulic elements including hydraulic pumps, hydraulic motors, hydraulic cylinders and hydraulic valve groups, such as pressure test, leakage test and function test.

[0023] (2) The hydraulic system of the dredging equipment test bed of the present application has a plurality of control points and monitoring points, the pressure and flow of each pump source can be remotely adjusted, and the pressure and flow values can be monitored and recorded in real time, which is beneficial to the setting and collection of test data, so that the hydraulic system can more reliably and conveniently complete the test of dredging equipment; the system monitors the oil temperature in real time and alarms when the temperature is high, and monitors the oil level and alarms when the oil level is low, and automatically stops when the oil level is too low to protect the equipment.

[0024] (3) The hydraulic system of the dredging equipment test bed of the present application has an oil filtering and monitoring system, which circulates and filters the oil by a separate hydraulic pump, and monitors the oil cleanliness in real time through an online detector; if the cleanliness decreases to a set value, the system will alarm and display, so that maintenance personnel can timely troubleshoot, avoid the wear of hydraulic elements caused by unclean oil, and ensure the safety of the equipment.

[0025] (4) The test machine position adjustment hydraulic system and the cutting and conveying device hydraulic system of the present application are provided with a pump valve group, when the system monitored that only one system is working, the pump valve group is automatically opened to supply the pump source of the other system, so as to improve the speed of the current working system; when the system monitored that both systems have commands, the pump valve group is disconnected, and the two systems work independently without interference, which can reduce the size and type of the hydraulic pumps of the two systems, save costs, and reduce energy consumption.

[0026] (5) The hydraulic system of the dredging equipment test bed of the present application uses a water-cooled cooler for cooling, and a water cooling system is formed by setting a water tank and a water pump on the test bed to cool the hydraulic system, effectively reducing the oil temperature and ensuring long-term reliable operation of the system. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is the hydraulic principle diagram of the overall hydraulic system of the present application;

[0028] Figure 2 is the hydraulic principle diagram of the power source system and the oil filtering and monitoring hydraulic system of the present application;

[0029] Figure 3 is the hydraulic principle diagram of the test machine position adjustment hydraulic system of the present application;

[0030] Figure 4is the hydraulic schematic diagram of the cutting and conveying device hydraulic system of the application;

[0031] Figure 5 is the front view of the test bench of the application.

[0032] In the figure: 1, oil tank; 2.1, power source low pressure oil filter one; 2.2, power source low pressure oil filter two; 2.3, power source low pressure oil filter three; 2.4, power source low pressure oil filter four; 2.5, filter pipeline low pressure oil filter; 2.6, power source high pressure oil filter one; 2.7, power source high pressure oil filter two; 2.8, power source high pressure oil filter three; 2.9, power source high pressure oil filter four; 2.10, filter pipeline high pressure oil filter; 2.11, total oil return 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; 7.4, hydraulic pump four; 7.5, hydraulic pump five; 8.1, power source suction butterfly valve one; 8.2, power source suction butterfly valve two; 8.3, power source suction butterfly valve three; 8.4, filter pipeline suction butterfly valve; 8.5, stop valve one; 8.6, stop valve two; 9, temperature sensor; 10.1, power source pressure sensor one; 10.2, power source pressure sensor two; 10.3, power source pressure sensor three; 10.4, power source pressure sensor four; 10.5, filter pipeline pressure sensor; 11, cleanliness on-line detector; 12.1, power source check valve one; 12.2, power source check valve two; 12.3, power source check valve three; 12.4, power source check valve four; 12.5, filter pipeline check valve; 13.1, proportional overflow valve one; 13.2, proportional overflow valve two; 13.3, proportional overflow valve three; 13.4, proportional overflow valve four; 14.1, proportional speed regulating valve one; 14.2, proportional speed regulating valve two; 14.3, proportional speed regulating valve three; 14.4, proportional speed regulating valve four; 15, water-cooled cooler; 16, pump combining valve group; 17.1, flowmeter one; 17.2, flowmeter two; 17.3, flowmeter three; 17.4, flowmeter four; 18.1, position adjusting electro-hydraulic reversing valve one; 18.2, position adjusting electro-hydraulic reversing valve two; 18.3, position adjusting electro-hydraulic reversing valve three; 18.4, position adjusting electro-hydraulic reversing valve four; 18.5, position adjusting electro-hydraulic reversing valve five; 18.6, position adjusting electro-hydraulic reversing valve six; 18.7, traveling electro-hydraulic reversing valve; 18.8, mud pump electro-hydraulic reversing valve; 18.9, reamer electro-hydraulic reversing valve; 18.10, standby equipment electro-hydraulic reversing valve one; 18.11, standby equipment electro-hydraulic reversing valve two; 19.1, balance valve one; 19.2, balance valve two; 20.1, hydraulic control check valve one; 20.2, hydraulic control check valve two; 20.3, hydraulic control check valve three; 20.4, hydraulic control check valve four; 20.5, hydraulic control check valve five; 20.6, hydraulic control check valve six; 20.7, hydraulic control check valve seven; 20.8, hydraulic control check valve eight; 20.9, hydraulic control check valve nine; 20.10, hydraulic control check valve ten; 21.1, check throttle valve one; 21.2, check throttle valve two; 21.3, check throttle valve three; 21.4, check throttle valve four.5, one-way throttle valve five; 21.6, one-way throttle valve six; 21.7, one-way throttle valve seven; 21.8, one-way throttle valve eight; 21.9, one-way throttle valve nine; 21.10, one-way throttle valve ten; 21.11, one-way throttle valve eleven; 21.12, one-way throttle valve twelve; 22.1, test machine lifting hydraulic cylinder; 22.2, test machine lifting locking hydraulic cylinder; 22.3, test machine left and right moving hydraulic cylinder; 22.4, test machine left and right moving locking hydraulic cylinder; 22.5, harrow head cover angle adjusting hydraulic cylinder; 22.6, reamer angle adjusting hydraulic cylinder; 23.1, test machine walking hydraulic motor; 23.2, mud pump hydraulic motor; 23.3, reamer hydraulic motor; 24, electromagnetic overflow valve group. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below with examples and in conjunction with the drawings. It should be understood that the specific examples described herein are only used to explain the present application and not to limit the present application.

[0034] 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 cannot 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 cannot be understood as limiting the present application.

[0035] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" 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 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.

[0036] EMBODIMENT

[0037] Please refer to Figures 1-5 The embodiment provides a hydraulic system of a dredging equipment test bench, which comprises a power source hydraulic system, a test machine position adjusting hydraulic system, a cutting and conveying device hydraulic system and an oil filtering and monitoring hydraulic system, wherein the power source hydraulic system is connected with the test machine position adjusting hydraulic system, the cutting and conveying device hydraulic system and the oil filtering and monitoring hydraulic system respectively.

[0038] The power source hydraulic system comprises hydraulic pump one 7.1, hydraulic pump two 7.2, hydraulic pump three 7.3, hydraulic pump four 7.4, oil tank 1, and oil return main pipe T. The suction ports of the hydraulic pump one 7.1, hydraulic pump two 7.2, hydraulic pump three 7.3, and hydraulic pump four 7.4 are connected to the outlet of the oil tank 1. The outlets of the hydraulic pump one 7.1, hydraulic pump two 7.2, hydraulic pump three 7.3, and hydraulic pump four 7.4 are respectively connected to P1, P2, P3, and P4, and are respectively connected to the test machine position adjustment hydraulic system and the cutting and conveying device hydraulic system.

[0039] The hydraulic pump one 7.1, hydraulic pump two 7.2, hydraulic pump three 7.3, and hydraulic pump four 7.4 are driven by electric motors. The suction port of the hydraulic pump one 7.1 is connected to the outlet of the oil tank 1 through power source low-pressure oil filter one 2.1 and power source suction butterfly valve one 8.1 in sequence. The suction port of the hydraulic pump two 7.2 is connected to the outlet of the oil tank 1 through power source low-pressure oil filter two 2.2 and power source suction butterfly valve two 8.2 in sequence. The suction port of the hydraulic pump three 7.3 is connected to the outlet of the oil tank 1 through power source low-pressure oil filter three 2.3 and power source suction butterfly valve two 8.2 in sequence. The suction port of the hydraulic pump four 7.4 is connected to the outlet of the oil tank 1 through power source low-pressure oil filter four 2.4 and power source suction butterfly valve three 8.3 in sequence. The water-cooled cooler 15 and the total oil return filter 2.11 are arranged in the oil return direction along the oil return main pipe T in sequence, so that the oil returns to the oil tank 1 after passing through the water-cooled cooler 15 and the total oil return filter 2.11.

[0040] The outlet pipeline of the hydraulic pump one 7.1 is sequentially provided with a power source high-pressure oil filter one 2.6, a power source check valve one 12.1, a proportional speed regulating valve one 14.1, a power source pressure sensor one 10.1 and a flowmeter one 17.1, respectively, an outlet pipeline between the power source high-pressure oil filter one 2.6 and the power source check valve one 12.1 is provided with a power source overflow branch one, and the power source overflow branch one is provided with a proportional overflow valve one 13.1; the outlet pipeline of the hydraulic pump two 7.2 is sequentially provided with a power source high-pressure oil filter two 2.7, a power source check valve two 12.2, a proportional speed regulating valve two 14.2, a power source pressure sensor two 10.2 and a flowmeter two 17.2, respectively, an outlet pipeline between the power source high-pressure oil filter two 2.7 and the power source check valve two 12.2 is provided with a power source overflow branch two, and the power source overflow branch two is provided with a proportional overflow valve two 13.2; the outlet pipeline of the hydraulic pump three 7.3 is sequentially provided with a power source high-pressure oil filter three 2.8, a power source check valve three 12.3, a proportional speed regulating valve three 14.3, a power source pressure sensor three 10.3 and a flowmeter three 17.3, respectively, an outlet pipeline between the power source high-pressure oil filter three 2.8 and the power source check valve three 12.3 is provided with a power source overflow branch three, and the power source overflow branch three is provided with a proportional overflow valve three 13.3; the outlet pipeline of the hydraulic pump four 7.4 is sequentially provided with a power source high-pressure oil filter four 2.9, a power source check valve four 12.4, a proportional speed regulating valve four 14.4, a power source pressure sensor four 10.4 and a flowmeter four 17.4, respectively, an outlet pipeline between the power source high-pressure oil filter four 2.9 and the power source check valve four 12.4 is provided with a power source overflow branch four, and the power source overflow branch four is provided with a proportional overflow valve four 13.4; the power source overflow branch one, the power source overflow branch two, the power source overflow branch three and the power source overflow branch four are connected with an oil return main pipe T, and the oil return main pipe T is connected with an oil return port of the oil tank 1.

[0041] The oil tank 1 is provided with a liquid level gauge 3, an air filter 4, a high liquid level alarm 5.1, a low liquid level alarm 5.2, an oil temperature alarm 6, and a temperature sensor 9, the liquid level gauge 3 is installed on one side of the side wall of the oil tank 1, the air filter 4 and the oil temperature alarm 6 are installed on 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 installed at the high liquid level and the low liquid level of the side wall of the oil tank 1 respectively, and the temperature sensor 9 is installed at the lower part of the oil tank 1.

[0042] The outlet of the hydraulic pump one 7.1 drives the position adjustment device of the testing machine position adjustment hydraulic system to act, for adjusting the lifting, left and right movement of the testing machine, the locking of the testing machine position, and the angle of the harrow head cover and the angle of the reamer.

[0043] The test machine position adjusting hydraulic system comprises a position adjusting control valve group, a test machine lifting hydraulic oil cylinder 22.1 for driving the test machine to lift, a test machine lifting locking hydraulic oil cylinder 22.2 for locking the lifting position of the test machine, a test machine left-right moving hydraulic oil cylinder 22.3 for driving the test machine to move left and right, a test machine left-right moving locking hydraulic oil cylinder 22.4 for locking the left-right moving position of the test machine, a rake head cover angle adjusting hydraulic oil cylinder 22.5 for adjusting the angle of the rake head cover, and a reamer angle adjusting hydraulic oil cylinder 22.6 for adjusting the angle of the reamer. The outlet of the hydraulic pump one 7.1 is connected to the rod cavity and the rodless cavity of each hydraulic oil cylinder through the position adjusting control valve group, and the oil return pipe of the position adjusting control valve group is connected to the inlet of the water-cooled cooler 15 of the oil return main pipe T.

[0044] The position adjusting control valve group comprises a position adjusting electro-hydraulic reversing valve one 18.1, a position adjusting electro-hydraulic reversing valve two 18.2, a position adjusting electro-hydraulic reversing valve three 18.3, a position adjusting electro-hydraulic reversing valve four 18.4, a position adjusting electro-hydraulic reversing valve five 18.5, a position adjusting electro-hydraulic reversing valve six 18.6, a balance valve one 19.1, a balance valve two 19.2, a hydraulic control check valve one 20.1, a hydraulic control check valve two 20.2, a hydraulic control check valve three 20.3, a hydraulic control check valve four 20.4, a hydraulic control check valve five 20.5, a hydraulic control check valve six 20.6, a hydraulic control check valve seven 20.7, a hydraulic control check valve eight 20.8, a hydraulic control check valve nine 20.9, a hydraulic control check valve ten 20.10, a one-way throttling valve one 21.1, a one-way throttling valve two 21.2, a one-way throttling valve three 21.3, a one-way throttling valve four 21.4, a one-way throttling valve five 21.5, a one-way throttling valve six 21.6, a one-way throttling valve seven 21.7, a one-way throttling valve eight 21.8, a one-way throttling valve nine 21.9, a one-way throttling valve ten 21.10, a one-way throttling valve eleven 21.11, and a one-way throttling valve twelve 21.12. The outlet of the hydraulic pump one 7.1 is connected to the P port of the position adjusting electro-hydraulic reversing valve one 18.1, the position adjusting electro-hydraulic reversing valve two 18.2, the position adjusting electro-hydraulic reversing valve three 18.3, the position adjusting electro-hydraulic reversing valve four 18.4, the position adjusting electro-hydraulic reversing valve five 18.5, and the position adjusting electro-hydraulic reversing valve six 18.6. The T port of the position adjusting electro-hydraulic reversing valve one 18.1, the position adjusting electro-hydraulic reversing valve two 18.2, the position adjusting electro-hydraulic reversing valve three 18.3, the position adjusting electro-hydraulic reversing valve four 18.4, the position adjusting electro-hydraulic reversing valve five 18.5, and the position adjusting electro-hydraulic reversing valve six 18.6 is connected to the oil return pipe of the position adjusting control valve group.

[0045] The A port of the position adjusting electro-hydraulic reversing valve 18.1 is connected to the rod cavity of the testing machine lifting hydraulic cylinder 22.1 through the balance valve 19.1 and the one-way throttle valve 21.1 in sequence, and the B port of the position adjusting electro-hydraulic reversing valve 18.1 is connected to the rodless cavity of the testing machine lifting hydraulic cylinder 22.1 through the balance valve 19.2 and the one-way throttle valve 21.2 in sequence; the control oil path of the balance valve 19.1 is connected to the rodless cavity side of the testing machine lifting hydraulic cylinder through a damping hole, and the control oil path of the balance valve 19.2 is connected to the rod cavity side of the testing machine lifting hydraulic cylinder through a damping hole.

[0046] The A port of the position adjusting electro-hydraulic reversing valve 18.1 is connected to the rod cavity of the testing machine lifting hydraulic cylinder 22.1 through the balance valve 19.1 and the one-way throttle valve 21.1 in sequence, and the B port of the position adjusting electro-hydraulic reversing valve 18.1 is connected to the rodless cavity of the testing machine lifting hydraulic cylinder 22.1 through the balance valve 19.2 and the one-way throttle valve 21.2 in sequence; the control oil path of the balance valve 19.1 is connected to the rodless cavity side of the testing machine lifting hydraulic cylinder through a damping hole, and the control oil path of the balance valve 19.2 is connected to the rod cavity side of the testing machine lifting hydraulic cylinder through a damping hole.

[0047] The A port of the position adjusting electro-hydraulic reversing valve 18.1 is connected to the rod cavity of the testing machine lifting hydraulic cylinder 22.1 through the balance valve 19.1 and the one-way throttle valve 21.1 in sequence, and the B port of the position adjusting electro-hydraulic reversing valve 18.1 is connected to the rodless cavity of the testing machine lifting hydraulic cylinder 22.1 through the balance valve 19.2 and the one-way throttle valve 21.2 in sequence; the control oil path of the balance valve 19.1 is connected to the rodless cavity side of the testing machine lifting hydraulic cylinder through a damping hole, and the control oil path of the balance valve 19.2 is connected to the rod cavity side of the testing machine lifting hydraulic cylinder through a damping hole.

[0048] The A port of the position adjusting electro-hydraulic reversing valve 18.1 is connected to the rod cavity of the testing machine lifting hydraulic cylinder 22.1 through the balance valve 19.1 and the one-way throttle valve 21.1 in sequence, and the B port of the position adjusting electro-hydraulic reversing valve 18.1 is connected to the rodless cavity of the testing machine lifting hydraulic cylinder 22.1 through the balance valve 19.2 and the one-way throttle valve 21.2 in sequence; the control oil path of the balance valve 19.1 is connected to the rodless cavity side of the testing machine lifting hydraulic cylinder through a damping hole, and the control oil path of the balance valve 19.2 is connected to the rod cavity side of the testing machine lifting hydraulic cylinder through a damping hole.

[0049] The A port of the position adjustment electro-hydraulic reversing valve five 18.5 is connected to the rod cavity of the angle adjustment hydraulic cylinder 22.5 of the rake head cover through the hydraulic control check valve seven 20.7 and the one-way throttle valve nine 21.9 in sequence, the B port of the position adjustment electro-hydraulic reversing valve five 18.5 is connected to the rodless cavity of the angle adjustment hydraulic cylinder 22.5 of the rake head cover through the hydraulic control check valve eight 20.8 and the one-way throttle valve ten 21.10 in sequence; the hydraulic control port of the hydraulic control check valve seven 20.7 is connected to the oil inlet port of the hydraulic control check valve eight 20.8, and the hydraulic control port of the hydraulic control check valve eight 20.8 is connected to the oil inlet port of the hydraulic control check valve seven 20.7.

[0050] The A port of the position adjustment electro-hydraulic reversing valve six 18.6 is connected to the rod cavity of the angle adjustment hydraulic cylinder 22.6 of the reamer through the hydraulic control check valve nine 20.9 and the one-way throttle valve eleven 21.11 in sequence, the B port of the position adjustment electro-hydraulic reversing valve six 18.6 is connected to the rodless cavity of the angle adjustment hydraulic cylinder 22.6 of the reamer through the hydraulic control check valve ten 20.10 and the one-way throttle valve twelve 21.12 in sequence; the hydraulic control port of the hydraulic control check valve nine 20.9 is connected to the oil inlet port of the hydraulic control check valve ten 20.10, and the hydraulic control port of the hydraulic control check valve ten 20.10 is connected to the oil inlet port of the hydraulic control check valve nine 20.9.

[0051] The high-pressure hydraulic oil P1 at the outlet of the hydraulic pump one 7.1 passes through each position adjustment electro-hydraulic reversing valve, then passes through the bidirectional balance valve or the bidirectional hydraulic control check valve, and then enters the corresponding hydraulic cylinder through the one-way throttle valve. The oil return of each hydraulic cylinder returns to the oil tank 1 through the water-cooled cooler 15 and the total oil return filter 2.11.

[0052] The outlets of the hydraulic pump two 7.2, the hydraulic pump three 7.3 and the hydraulic pump four 7.4 drive the cutting and conveying device to act through the cutting and conveying device hydraulic system, so as to realize the excavation and conveying of silt.

[0053] The cutting and conveying device hydraulic system comprises a cutting and conveying device control valve group, a test machine walking hydraulic motor 23.1 for driving the test machine to walk, a mud pump hydraulic motor 23.2 for driving the mud pump to operate, and a reamer hydraulic motor 23.3 for driving the reamer to operate. The outlet of the hydraulic pump two 7.2 is connected to the A and B ports of the test machine walking hydraulic motor 23.1 through the cutting and conveying device control valve group, the outlet of the hydraulic pump three 7.3 is connected to the A and B ports of the mud pump hydraulic motor 23.2 through the cutting and conveying device control valve group, the outlet of the hydraulic pump four 7.4 is connected to the A and B ports of the reamer hydraulic motor 23.3 and a plurality of equipment standby interfaces through the cutting and conveying device control valve group, and the oil return pipe of the cutting and conveying device control valve group is connected to the inlet of the water-cooled cooler 15 on the total oil return pipe T.

[0054] The cutting and conveying device control valve group includes a walking electro-hydraulic reversing valve 18.7, a mud pump electro-hydraulic reversing valve 18.8, a reamer electro-hydraulic reversing valve 18.9 and a plurality of standby equipment electro-hydraulic reversing valves. The outlet of the hydraulic pump two 7.2 is connected to the P port of the walking electro-hydraulic reversing valve 18.7, the A port of the walking electro-hydraulic reversing valve 18.7 is connected to the A port of the walking hydraulic motor 23.1 of the testing machine, and the B port of the walking electro-hydraulic reversing valve 18.7 is connected to the B port of the walking hydraulic motor 23.1 of the testing machine. The outlet of the hydraulic pump three 7.3 is connected to the P port of the mud pump electro-hydraulic reversing valve 18.8, the A port of the mud pump electro-hydraulic reversing valve 18.8 is connected to the A port of the mud pump hydraulic motor 23.2, and the B port of the mud pump electro-hydraulic reversing valve 18.8 is connected to the B port of the mud pump hydraulic motor 23.2. The outlet of the hydraulic pump four 7.4 is connected to the P port of the reamer electro-hydraulic reversing valve 18.9 and the P ports of each standby equipment electro-hydraulic reversing valve. The A port of the reamer electro-hydraulic reversing valve 18.9 is connected to the A port of the reamer hydraulic motor 23.3, the B port of the reamer electro-hydraulic reversing valve 18.9 is connected to the B port of the reamer hydraulic motor 23.3, the A port of each standby equipment electro-hydraulic reversing valve is respectively connected to the A port of each equipment standby interface, and the B port of each standby equipment electro-hydraulic reversing valve is respectively connected to the B port of each equipment standby interface. The T ports of the walking electro-hydraulic reversing valve 18.7, the mud pump electro-hydraulic reversing valve 18.8, the reamer electro-hydraulic reversing valve 18.9 and each standby equipment electro-hydraulic reversing valve are connected to the oil return pipe of the cutting and conveying device control valve group.

[0055] The cutting and conveying device hydraulic system has a plurality of equipment standby interfaces. A cut-off valve one 8.5 is arranged on the oil return pipe of the T port of a corresponding standby equipment electro-hydraulic reversing valve one 18.10 of the equipment standby interface one, and a cut-off valve two 8.6 is arranged on the oil return pipe of the T port of a corresponding standby equipment electro-hydraulic reversing valve two 18.11 of the equipment standby interface two.

[0056] High-pressure hydraulic oil P2 from the outlet of the hydraulic pump two 7.2 enters the walking electro-hydraulic reversing valve 18.7, and then enters the walking hydraulic motor 23.1 of the testing machine. High-pressure hydraulic oil P3 from the outlet of the hydraulic pump three 7.3 enters the mud pump electro-hydraulic reversing valve 18.8, and then enters the mud pump hydraulic motor 23.2. High-pressure hydraulic oil P4 from the outlet of the hydraulic pump four 7.4 enters the reamer electro-hydraulic reversing valve 18.9, and then enters the reamer hydraulic motor 23.3. High-pressure hydraulic oil P4 can also enter the standby equipment electro-hydraulic reversing valve, and then enter the hydraulic motor of the connected standby equipment. The oil return of each hydraulic motor returns to the oil tank 1 through the water-cooled cooler 15 and the total oil return filter 2.11.

[0057] The outlet pipeline of the hydraulic pump one 7.1 and the outlet pipeline of the hydraulic pump four 7.4 are connected through the parallel pump valve group 16. The parallel pump valve group 16 comprises a control shuttle valve, a one-way cartridge valve and an electromagnetic cartridge valve. The outlet pipeline of the hydraulic pump one 7.1 is connected to the A port of the control shuttle valve and the A port of the one-way cartridge valve respectively. The B port of the control shuttle valve is connected to the outlet pipeline of the hydraulic pump four 7.4. The C port of the control shuttle valve is connected to the P port of the electromagnetic cartridge valve through a damping hole. The A port of the electromagnetic cartridge valve is connected to the X cavity of the one-way cartridge valve through a damping hole. The B port of the one-way cartridge valve is connected to the outlet pipeline of the hydraulic pump four 7.4.

[0058] The oil filtering and monitoring hydraulic system comprises an oil filtering pipeline. The inlet of the oil filtering pipeline is connected to the outlet of the oil tank 1. The outlet of the oil filtering pipeline is connected to the oil return port of the oil tank 1. The oil filtering pipeline is sequentially provided with a filtering pipeline suction butterfly valve 8.4, a filtering pipeline low-pressure oil filter 2.5, a hydraulic pump five 7.5, a filtering pipeline pressure sensor 10.5, a filtering pipeline high-pressure oil filter 2.10, an online cleanliness detector 11 and a filtering pipeline one-way valve 12.5 from the inlet to the outlet. The oil filtering pipeline between the hydraulic pump five 7.5 and the filtering pipeline pressure sensor 10.5 is provided with a filtering pipeline overflow branch. The filtering pipeline overflow branch is provided with an electromagnetic overflow valve group 24. The filtering pipeline overflow branch is connected to the oil return port of the oil tank 1.

[0059] The hydraulic pump five 7.5 driven by the electric motor sucks the oil in the oil tank 1, and then the oil enters the hydraulic pump five 7.5 through the filtering pipeline suction butterfly valve 8.4 and the filtering pipeline low-pressure oil filter 2.5 in sequence. The high-pressure hydraulic oil P5 at the outlet of the hydraulic pump five 7.5 enters the filtering pipeline pressure sensor 10.5, the filtering pipeline high-pressure oil filter 2.10, the online cleanliness detector 11 and the filtering pipeline one-way valve 12.5, and then enters the oil tank 1.

[0060] The specific actions of each system will be described below in combination with Figures 1-5 The specific actions of each system will be described below in combination with

[0061] Power source hydraulic system: hydraulic pump one 7.1, hydraulic pump two 7.2, hydraulic pump three 7.3, hydraulic pump four 7.4 are driven by motor M1, motor M2, motor M3, motor M4 to suck hydraulic oil in the oil tank 11, the hydraulic oil corresponds to pass through power source suction butterfly valve one 8.1, power source suction butterfly valve two 8.2, power source suction butterfly valve three 8.3, power source low pressure oil filter one 2.1, power source low pressure oil filter two 2.2, power source low pressure oil filter three 2.3, power source low pressure oil filter four 2.4, and then be discharged by hydraulic pump one 7.1, hydraulic pump two 7.2, hydraulic pump three 7.3, hydraulic pump four 7.4 high pressure hydraulic oil P1, P2, P3, P4, the high pressure hydraulic oil corresponds to pass through power source high pressure oil filter one 2.6, power source high pressure oil filter two 2.7, power source high pressure oil filter three 2.8, power source high pressure oil filter four 2.9, proportional overflow valve one 13.1, proportional overflow valve two 13.2, proportional overflow valve three 13.3, proportional overflow valve four 13.4, power source check valve one 12.1, power source check valve two 12.2, power source check valve three 12.3, power source check valve four 12.4, proportional speed regulating valve one 14.1, proportional speed regulating valve two 14.2, proportional speed regulating valve three 14.3, proportional speed regulating valve four 14.4, power source pressure sensor one 10.1, power source pressure sensor two 10.2, power source pressure sensor three 10.3, power source pressure sensor four 10.4, flow meter one 17.1, flow meter two 17.2, flow meter, flow meter four 17.4, and discharged to each system; when RS01, RS02, RS03, RS04 is powered, each system pressure can be remotely adjusted; when RS05, RS06, RS07, RS08 is powered, each system flow can be remotely adjusted; high pressure hydraulic oil P1 and high pressure hydraulic oil P4 can be combined by the combined pump valve group 16, and when S123 is powered, high pressure hydraulic oil P1 and P4 are combined. System oil return passes through the water-cooled cooler 15 and the total oil return filter 2.11 to return to the oil tank 1.

[0062] The test machine position adjustment hydraulic system: the high pressure hydraulic oil P1 of hydraulic pump 7.1 passes through position adjustment electro-hydraulic reversing valve 18.1, then passes through balance valve 19.1, balance valve 19.2, one-way throttle valve 21.1, one-way throttle valve 21.2, and then enters the test machine lifting hydraulic cylinder 22.1 to drive the test machine lifting action. When RS01, RS05 and S101 are powered, the high pressure hydraulic oil P1 is discharged from A port, enters the rod cavity of the test machine lifting hydraulic cylinder 22.1, and the test machine lifting hydraulic cylinder 22.1 retracts to drive the test machine to rise; when RS01, RS05 and S102 are powered, the high pressure hydraulic oil P1 is discharged from B port, enters the rodless cavity of the test machine lifting hydraulic cylinder 22.1, and the test machine lifting hydraulic cylinder 22.1 extends to drive the test machine to descend. The action principle of other hydraulic cylinders is the same as that of the test machine lifting hydraulic cylinder 22.1.

[0063] The cutting and conveying device hydraulic system: the high pressure hydraulic oil P2 of hydraulic pump 7.2 passes through the walking electro-hydraulic reversing valve 18.7, enters the test machine walking hydraulic motor 23.1, and drives the test machine to walk. When RS02, RS06 and S113 are powered, the high pressure hydraulic oil P2 enters the test machine walking hydraulic motor 23.1 A port, and the test machine walks forward; when RS02, RS06 and S114 are powered, the high pressure hydraulic oil P2 enters the test machine walking hydraulic motor 23.1 B port, and the test machine walks backward. Similarly, the high pressure hydraulic oil P3 of hydraulic pump 7.3 passes through the mud pump electro-hydraulic reversing valve 18.8, enters the mud pump hydraulic motor 23.2, and drives the mud pump to operate; the high pressure hydraulic oil P4 of hydraulic pump 7.4 passes through the reamer electro-hydraulic reversing valve 18.9, enters the reamer hydraulic motor 23.3, and drives the reamer to operate.

[0064] The oil filtering and monitoring hydraulic system: the hydraulic pump 7.5 is driven by the motor M5, connected with the oil tank 1 through the filtering pipeline low pressure oil filter 2.5 and the filtering pipeline suction butterfly valve 8.4, and the high pressure hydraulic oil P5 at the outlet of the hydraulic pump 7.5 enters the electromagnetic overflow valve group 24, the pressure filtering pipeline pressure sensor 10.5, the filtering pipeline high pressure oil filter 2.10, the cleanliness online detector 11, the filtering pipeline one-way valve 12.5, and then enters the oil tank 1. When the S100 electromagnetic valve of the electromagnetic overflow valve group 24 is powered, the high pressure hydraulic oil P5 discharged from the outlet of the hydraulic pump 7.5 passes through the pressure filtering pipeline pressure sensor 10.5, the filtering pipeline high pressure oil filter 2.10, the cleanliness online detector 11, the filtering pipeline one-way valve 12.5, and then enters the oil tank 1, to complete the filtering and cleanliness detection of the system oil.

[0065] 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 hydraulic system for a dredging equipment test bench, characterized in that: The hydraulic system comprises a power source hydraulic system, a testing machine position adjustment hydraulic system, a cutting and conveying device hydraulic system and an oil filtering and monitoring hydraulic system, wherein the power source hydraulic system is connected with the testing machine position adjustment hydraulic system, the cutting and conveying device hydraulic system and the oil filtering and monitoring hydraulic system respectively. The power source hydraulic system comprises hydraulic pump one, hydraulic pump two, hydraulic pump three, hydraulic pump four, an oil tank and an oil return main pipe T, the suction ports of the hydraulic pump one, the hydraulic pump two, the hydraulic pump three and the hydraulic pump four are connected with the outlet of the oil tank, the outlets of the hydraulic pump one, the hydraulic pump two, the hydraulic pump three and the hydraulic pump four are connected with the testing machine position adjustment hydraulic system and the cutting and conveying device hydraulic system respectively, the outlet pipelines of the hydraulic pump one, the hydraulic pump two, the hydraulic pump three and the hydraulic pump four are respectively provided with a power source pressure sensor and a flow meter, the outlet pipelines of the hydraulic pump one, the hydraulic pump two, the hydraulic pump three and the hydraulic pump four are respectively provided with a power source overflow branch, each power source overflow branch is connected with the oil return main pipe T, and the oil return main pipe T is connected with the oil return port of the oil tank. The outlet of the hydraulic pump one drives the position adjustment device to act through the testing machine position adjustment hydraulic system, so as to adjust the lifting, left and right movement, locking of the testing machine position and the angle of the harrow head cover and the angle of the reamer. The outlets of the hydraulic pump two, the hydraulic pump three and the hydraulic pump four drive the cutting and conveying device to act through the cutting and conveying device hydraulic system, so as to realize the excavation and conveying of the silt. The cutting and conveying device hydraulic system is provided with a plurality of equipment standby interfaces, and a stop valve is arranged on the oil return pipeline of each equipment standby interface. The outlet pipeline of the hydraulic pump one and the outlet pipeline of the hydraulic pump four are connected through a parallel pump valve group. The oil filtering and monitoring hydraulic system comprises an oil filtering pipeline, the inlet of the oil filtering pipeline is connected with the outlet of the oil tank, the outlet of the oil filtering pipeline is connected with the oil return port of the oil tank, and the oil filtering pipeline is sequentially provided with a hydraulic pump five, a filtering pipeline pressure sensor, a filtering pipeline high-pressure oil filter, a cleanliness online detector and a filtering pipeline check valve.

2. The hydraulic system of a trial bed of dredging equipment according to claim 1, characterized in that, The outlet pipelines of the hydraulic pump one, the hydraulic pump two, the hydraulic pump three and the hydraulic pump four are sequentially provided with a power source high-pressure oil filter, a power source check valve, a proportional speed regulating valve, a power source pressure sensor and a flow meter respectively, and each power source overflow branch is provided with a proportional overflow valve.

3. The hydraulic system of a trial bed of dredging equipment according to claim 1, characterized in that, The hydraulic pump one, the hydraulic pump two, the hydraulic pump three and the hydraulic pump four are driven by an electric motor, the suction ports of the hydraulic pump one, the hydraulic pump two, the hydraulic pump three and the hydraulic pump four are sequentially connected with the outlet of the oil tank through a power source low-pressure oil filter and a power source suction port butterfly valve, and a water-cooled cooler and a total oil return filter are sequentially arranged in the oil return direction of the oil return main pipe T, so that the oil return passes through the water-cooled cooler and the total oil return filter and then returns to the oil tank.

4. The hydraulic system of a trial bed of dredging equipment according to claim 1, characterized in that, The oil tank is provided with a liquid level gauge, an air filter, a high liquid level alarm, a low liquid level alarm, an oil temperature alarm and a temperature sensor.

5. The hydraulic system of a dredging equipment test bench according to claim 1, characterized in that, The test machine position adjusting hydraulic system comprises a position adjusting control valve group, a test machine lifting hydraulic oil cylinder for driving the test machine to lift, a test machine lifting locking hydraulic oil cylinder for locking the lifting position of the test machine, a test machine left-right moving hydraulic oil cylinder for driving the test machine to move left and right, a test machine left-right moving locking hydraulic oil cylinder for locking the left-right moving position of the test machine, a rake head cover angle adjusting hydraulic oil cylinder for adjusting the angle of the rake head cover, and a reamer angle adjusting hydraulic oil cylinder for adjusting the angle of the reamer. The outlet of the hydraulic pump one is connected with the rod cavity and the rodless cavity of each hydraulic oil cylinder through the position adjusting control valve group, and the oil return pipe of the position adjusting control valve group is connected with the inlet of the water-cooled cooler on the oil return main pipe T.

6. The hydraulic system of a dredging equipment test bench according to claim 1, characterized in that, The cutting and conveying device hydraulic system comprises a cutting and conveying device control valve group, a test machine walking hydraulic motor for driving the test machine to walk, a mud pump hydraulic motor for driving the mud pump to operate, and a reamer hydraulic motor for driving the reamer to operate. The outlet of the hydraulic pump two is connected with the A and B ports of the test machine walking hydraulic motor through the cutting and conveying device control valve group. The outlet of the hydraulic pump three is connected with the A and B ports of the mud pump hydraulic motor through the cutting and conveying device control valve group. The outlet of the hydraulic pump four is connected with the A and B ports of the reamer hydraulic motor and a plurality of equipment standby interfaces through the cutting and conveying device control valve group. The oil return pipe of the cutting and conveying device control valve group is connected with the inlet of the water-cooled cooler on the oil return main pipe T.

7. A hydraulic system for a trial bed of dredging equipment according to claim 6, characterized in that The cutting and conveying device control valve group comprises a walking electro-hydraulic reversing valve, a mud pump electro-hydraulic reversing valve, a reamer electro-hydraulic reversing valve and a plurality of standby equipment electro-hydraulic reversing valves, the outlet of the hydraulic pump two is connected with the P port of the walking electro-hydraulic reversing valve, the A port of the walking electro-hydraulic reversing valve is connected with the A port of the walking hydraulic motor of the testing machine, and the B port of the walking electro-hydraulic reversing valve is connected with the B port of the walking hydraulic motor of the testing machine; the outlet of the hydraulic pump three is connected with the P port of the mud pump electro-hydraulic reversing valve, the A port of the mud pump electro-hydraulic reversing valve is connected with the A port of the mud pump hydraulic motor, and the B port of the mud pump electro-hydraulic reversing valve is connected with the B port of the mud pump hydraulic motor; the outlet of the hydraulic pump four is connected with the P port of the reamer electro-hydraulic reversing valve and the P ports of the plurality of standby equipment electro-hydraulic reversing valves, the A port of the reamer electro-hydraulic reversing valve is connected with the A port of the reamer hydraulic motor, the B port of the reamer electro-hydraulic reversing valve is connected with the B port of the reamer hydraulic motor, the A ports of the plurality of standby equipment electro-hydraulic reversing valves are respectively connected with the A ports of the plurality of equipment standby interfaces, and the B ports of the plurality of standby equipment electro-hydraulic reversing valves are respectively connected with the B ports of the plurality of equipment standby interfaces; the T ports of the walking electro-hydraulic reversing valve, the T port of the mud pump electro-hydraulic reversing valve, the T port of the reamer electro-hydraulic reversing valve and the T ports of the plurality of standby equipment electro-hydraulic reversing valves are all connected with the oil return pipe of the cutting and conveying device control valve group.

8. A hydraulic system for a trial bed of dredging equipment according to claim 7, characterized in that The stop valve is arranged on the oil return pipeline of the T port of each standby equipment electro-hydraulic reversing valve.

9. The hydraulic system of a trial bed of dredging equipment according to claim 1, characterized in that, The parallel pump valve group comprises a control shuttle valve, a one-way cartridge valve and an electromagnetic cartridge valve, the outlet pipeline of the hydraulic pump one is connected with the A port of the control shuttle valve and the A port of the one-way cartridge valve, the B port of the control shuttle valve is connected with the outlet pipeline of the hydraulic pump four, the C port of the control shuttle valve is connected with the P port of the electromagnetic cartridge valve through a damping hole, the A port of the electromagnetic cartridge valve is connected with the X cavity of the one-way cartridge valve through a damping hole, and the B port of the one-way cartridge valve is connected with the outlet pipeline of the hydraulic pump four.

10. The hydraulic system of a dredging equipment test bench according to claim 1, characterized in that, The filtering pipeline between the outlet of the oil tank and the hydraulic pump five is sequentially provided with a filtering pipeline suction butterfly valve and a filtering pipeline low-pressure oil filter, the filtering pipeline between the hydraulic pump five and the filtering pipeline pressure sensor is provided with a filtering pipeline overflow branch, the filtering pipeline overflow branch is provided with an electromagnetic overflow valve group, and the filtering pipeline overflow branch is connected with the oil return port of the oil tank.

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