CN218118161U

CN218118161U - Real-time monitoring and protecting system for hydraulic system of shield machine

Info

Publication number: CN218118161U
Application number: CN202222135262.1U
Authority: CN
Inventors: 周树清; 王毅然; 金若雄; 刘振东; 吴志杰; 刘占波; 李蒙; 彭烈兵; 龚俊; 张文桂; 张伟
Original assignee: China Railway 11th Bureau Wuhan Heavy Equipment Co ltd; China Railway 11th Bureau Group Urban Rail Engineering Co Ltd
Current assignee: China Railway 11th Bureau Wuhan Heavy Equipment Co ltd; China Railway 11th Bureau Group Urban Rail Engineering Co Ltd
Priority date: 2022-08-15
Filing date: 2022-08-15
Publication date: 2022-12-23
Anticipated expiration: 2032-08-15

Abstract

The utility model provides a shield constructs quick-witted hydraulic system monitoring protection system. The monitoring and protecting system comprises a control module, a hydraulic oil online monitoring and filtering device and a protecting and cutting device for arranging an oil inlet of each set of shield machine hydraulic subsystem; the hydraulic oil on-line monitoring and filtering device comprises a sampling monitoring device and an oil tank circulating and filtering device, hydraulic oil in the whole oil tank is monitored through the sampling monitoring device, a signal is transmitted to the control module, and the oil tank circulating and filtering device is controlled by the control module to be opened to filter the hydraulic oil in the whole oil tank. The protection cutoff device comprises a hydraulic pump, an oil return pipeline and a hydraulic oil temperature sensor, the hydraulic oil temperature entering the hydraulic subsystem of the shield tunneling machine is detected through the hydraulic oil temperature sensor, and the hydraulic oil pump is controlled to be opened or closed. The utility model discloses reduced the hydraulic oil impurity volume that gets into shield structure machine hydraulic system, and protected subsystem, improved shield structure machine hydraulic system's life and stability.

Description

Real-time monitoring and protecting system for hydraulic system of shield machine

Technical Field

The utility model relates to a protection and monitoring devices, in particular to can be to shield structure quick-witted hydraulic system fluid on-line monitoring of shield structure and can automatic cutout protection shield structure quick-witted hydraulic system real-time supervision protection system.

Background

With the increasing shortage of energy and the increasing requirements of people on environmental protection, the energy-saving and environmental-protection performance index of the machine in the use process is more and more emphasized by users. For users, the economical and energy-saving product can save cost in the using process. Meanwhile, the failure rate and the maintenance share of the machine are reduced, and the investment return rate of a user can also be improved. The application of the hydraulic technology greatly improves the energy-saving and reliable effect of the engineering machinery, and the effect of the hydraulic technology on the shield machine is particularly obvious.

The hydraulic system of the shield tunneling machine uses hydraulic oil as a working medium, and the hydraulic oil is used as the working medium to transmit hydraulic energy in the hydraulic system of the shield tunneling machine and also has the functions of lubricating and preventing oxidation of surfaces of parts which move relatively; the aging, peeling and falling of the sealing element are caused along with the accumulation of the working time, and the wear of metal abrasive particles on the surface of the part is caused by the overlarge impact generated by frequent working condition change and violent load change of a hydraulic system. The particles enter the hydraulic oil, and are conveyed to each hydraulic subsystem of the shield machine along with the flowing of the oil in the pipeline, so that the normal and stable operation of the shield machine is influenced. In severe cases, the whole machine is paralyzed and can not run, and huge loss is caused to construction. In order to reduce the failure rate of the hydraulic system of the shield tunneling machine caused by oil pollution, the oil in the hydraulic system of the shield tunneling machine needs to be detected frequently.

Conventional oil detection comprises sampling detection and open-loop detection, the sampling detection can result in a long detection period, the actual quality of oil cannot be accurately displayed, and serious hysteresis exists. Because the shield constructs comparatively badly, pollutes more in the quick-witted actual service environment, the open loop detects inevitable and can cause secondary pollution, and has higher requirement to the individual technical merit of testing personnel. In addition, the conventional oil detection is centralized, a shield tunneling machine hydraulic system is formed by combining a plurality of subsystems, each subsystem shares an integrated hydraulic oil tank, and the problem that other systems are connected in series due to single system faults also exists, so that the hydraulic oil in the oil tank is only detected in a centralized manner and cannot be effectively judged at the initial stage of the faults; in addition, the existing detection mode can only detect the condition of the hydraulic oil, and the pollution problem cannot be solved immediately after detection.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the purpose is to the problem that exists among the prior art, provides a shield constructs quick-witted hydraulic system real-time supervision protection system, and this system can carry out real-time supervision to the hydraulic oil that constructs quick-witted system to the condition through the monitoring cuts off the protection to single hydraulic subsystem, and filters hydraulic oil, thereby reduces complete machine hydraulic system and is polluted the shut down.

In order to achieve the technical purpose, the utility model provides a real-time monitoring and protecting system for a hydraulic system of a shield machine, which comprises a control module, a hydraulic oil online monitoring and filtering device and a protecting and cutting device, wherein the protecting and cutting device is provided with an oil inlet of each set of hydraulic subsystem of the shield machine;

the hydraulic oil on-line monitoring and filtering device comprises a sampling monitoring device and an oil tank circulating and filtering device; the sampling monitoring device comprises a sampling port arranged on a whole oil tank of a hydraulic system of the shield tunneling machine and a first oil particle size detector arranged at the sampling port, wherein the signal output end of the first oil particle size detector is connected with the signal input end of the control module; the oil tank circulating filter device comprises a filtering oil tank and a first hydraulic pump, the filtering oil tank is internally divided into an upper filtering oil cavity and a lower crude oil cavity by a filtering screen plate, the bottom of the whole oil tank is communicated with the lower crude oil cavity of the filtering oil tank through an oil outlet pipe, a first one-way oil outlet electromagnetic valve is arranged on the oil outlet pipe, and the upper filtering oil cavity is communicated with the whole oil tank through a first oil return pipe; the signal output end of the control module is respectively connected with the first one-way oil outlet electromagnetic valve and the control end of the first hydraulic pump;

the protection cutting device comprises a second hydraulic pump arranged on a hydraulic pipeline connecting an oil outlet of the whole oil tank with an oil inlet of each set of hydraulic subsystem of the shield tunneling machine, a one-way oil inlet electromagnetic valve arranged at an inlet end of the second hydraulic pump, a second one-way oil outlet electromagnetic valve arranged at an oil drainage port of the second hydraulic pump, a second oil return pipe connecting the second one-way oil outlet electromagnetic valve with the whole oil tank, and a hydraulic oil temperature sensor arranged on an oil pipe loop; the signal output end of a hydraulic oil temperature sensor of each set of shield tunneling machine hydraulic subsystem protection and cutting device can be connected with the signal input end of the control module, and the signal output end of the control module is connected with the motor control end of a second hydraulic pump of each set of shield tunneling machine hydraulic subsystem protection and cutting device.

The utility model discloses better technical scheme: the oil tank circulating filter device also comprises a second oil particle size detector, an oil moisture detection sensor and a secondary filter system which are arranged on the first oil return pipe, wherein the first oil return pipe sequentially passes through the first hydraulic pump, the second oil particle size detector and the oil moisture detection sensor to form two branch pipelines, the first branch pipeline is provided with a first oil return electromagnetic valve, the second branch pipeline is provided with a second oil return electromagnetic valve and a one-way oil return valve, and the secondary filter system is arranged between the second oil return electromagnetic valve and the one-way oil return valve of the second branch pipeline and sequentially comprises an impurity removal filter and a vacuum filter; the signal output ends of the second oil particle size detector and the oil moisture detection sensor are respectively connected with the signal input end of the control module, and the signal output end of the control module is respectively connected with the control ends of the first oil return electromagnetic valve and the second oil return electromagnetic valve.

The utility model discloses better technical scheme: the liquid level observation hose is arranged on the filtering oil tank and extends from top to bottom, and liquid level scales are arranged on the liquid level observation hose from top to bottom; and a slag discharge valve is arranged at the bottom of the filtering oil tank.

The utility model discloses better technical scheme: the first hydraulic pump is a vane pump and is driven to operate by a motor; the oil outlet end of the first hydraulic pump is provided with a pressure relief protection pipeline, a safety overflow valve and a loading valve of the first hydraulic pump are arranged on the pressure relief protection pipeline, one end of the first hydraulic pump is communicated with the whole oil tank, and the other end of the first hydraulic pump is communicated with the safety overflow valve.

The utility model discloses better technical scheme: the control module adopts a PLC controller, is in signal connection with a control system of the shield machine operation room, transmits signals to the control system of the shield machine operation room, and displays and controls the signals through a control panel of the shield machine operation room.

The utility model discloses better technical scheme: the impurity removal filters are two, the two impurity removal filters are connected to the second branch pipeline through parallel pipelines, a third oil return electromagnetic valve is arranged on each parallel pipeline, and the signal output end of the control module is connected with the control ends of the two third oil return electromagnetic valves.

The utility model discloses following beneficial effect has:

1. the utility model discloses not reforming transform the original subsystem of shield structure machine, carry out real-time supervision to hydraulic oil through increasing bypass monitoring system, do not influence the job stabilization nature and the accurate nature of its former system, need not to restrict a certain system and shut down when starting to examine, can realize real-time detection.

2. The utility model discloses a system still includes complete machine oil tank fluid circulating filter device to not reforming transform shield structure machine complete machine hydraulic system, only a bypass detecting system does not influence stability and accurate nature under its normal use condition, can realize real-time detection.

3. The utility model discloses a PLC main control unit controls whole system to be connected PLC controller and shield structure machine control chamber, have more direct more convenient human-computer interaction interface display effect, make things convenient for shield structure machine operation hand can know the fluid quality change condition in normal construction use, in time sprout the initial stage at the trouble and take corresponding action.

The utility model solves the problems that the traditional open-loop shutdown detection method can not accurately reflect the system oil quality condition in real time and the detection result has lower timeliness; meanwhile, the early and timely cutting protection is carried out aiming at the fault of a single hydraulic subsystem of the shield tunneling machine, and the hydraulic oil in the oil tank is filtered, so that the pollution degree of the hydraulic oil entering the hydraulic system of the shield tunneling machine is reduced, the cleanliness of the hydraulic oil is improved, and the problem that the hydraulic system of the whole machine is polluted and stopped is solved.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a control schematic diagram of the present invention.

In the figure: 1-a control module, 2-a complete machine oil tank, 200-an oil outlet pipe, 201-a first oil return pipe, 3-a sampling port, 4-a first oil particle size detector, 5-an oil filter tank, 500-an upper filtering oil cavity, 501-a lower crude oil cavity, 502-a liquid level observation hose, 503-a slag discharge valve, 6-a first hydraulic pump, 8-a first one-way oil outlet electromagnetic valve, 9-a second hydraulic pump, 10-a one-way oil inlet electromagnetic valve, 11-a shield machine hydraulic subsystem, 12-a second one-way oil outlet electromagnetic valve, 13-a second oil return pipe, 14-a hydraulic oil temperature sensor, 15-a second oil particle size detector, 16 oil moisture detection sensors, 17-a first oil return electromagnetic valve, 18-a second oil return electromagnetic valve, 19-a one-way oil return valve, 20-an impurity removal filter, 21-a vacuum filter, 22-a safety overflow valve, 23-a loading valve and 24-a third oil return electromagnetic valve.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and examples. Fig. 1 to 2 are drawings of the embodiment, which are drawn in a simplified manner and are only used for clearly and concisely illustrating the purpose of the embodiment of the present invention. The following detailed description of the embodiments of the present invention is presented in the drawings and is not intended to limit the scope of the invention as claimed. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be understood that the terms "upper", "lower", "inner", "outer", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or orientations or positional relationships that a product of the present invention is usually placed when used, or orientations or positional relationships that a person skilled in the art usually understands, only for convenience of describing the present invention and simplifying the description, but not for indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used solely to distinguish one from another, and are not to be construed as indicating or implying relative importance.

The embodiment provides a real-time monitoring and protecting system of a hydraulic system of a shield machine, which comprises a control module 1, a hydraulic oil on-line monitoring and filtering device and a protecting and cutting device for arranging an oil inlet of each set of hydraulic subsystem of the shield machine; the control module 1 adopts a PLC controller, the control module 1 is in signal connection with a control system of the shield machine operation room, transmits signals to the control system of the shield machine operation room, and displays and controls the signals through a control panel of the shield machine operation room. The hydraulic oil on-line monitoring and filtering device comprises a sampling monitoring device and an oil tank circulating and filtering device.

As shown in fig. 1, a sampling monitoring device of a real-time monitoring protection system of a hydraulic system of a shield tunneling machine in an embodiment comprises a sampling port 3 arranged on a complete machine oil tank 2 of the hydraulic system of the shield tunneling machine and a first oil particle size detector 4 arranged at the sampling port 3; the oil tank circulating filter device comprises an oil filtering tank 5 and a first hydraulic pump 6, the oil filtering tank 5 is provided with a liquid level observation hose 502 extending from top to bottom, the liquid level observation hose 502 is provided with liquid level scales from top to bottom, and therefore the impurity accumulation degree can be judged by conveniently observing the oil depth of the oil filtering tank 5. The interior of the filtering oil tank 5 is divided into an upper filtering oil cavity 500 and a lower crude oil cavity 501 through a filtering screen plate 7, the filtering screen plate 7 can be detached, cleaned or replaced, the bottom of the whole oil tank 2 is communicated with the lower crude oil cavity 501 of the filtering oil tank 5 through an oil outlet pipe 200, the lower crude oil cavity 501 is lower than the height of an oil outlet of the whole oil tank 2, a first one-way oil outlet electromagnetic valve 8 is arranged on the oil outlet pipe 200, and the upper filtering oil cavity 500 is communicated with the whole oil tank 2 through a first oil return pipe 201; the second oil particle size detector 15, the oil moisture detection sensor 16 and the secondary filtering system are arranged on the first oil return pipe 201, the first oil return pipe 201 sequentially passes through the first hydraulic pump 6, the second oil particle size detector 15 and the oil moisture detection sensor 16 to form two branch pipelines, the first branch pipeline is provided with a first oil return electromagnetic valve 17, the second branch pipeline is provided with a second oil return electromagnetic valve 18 and a one-way oil return valve 19, the one-way oil return valve 19 is a hydraulic switch valve, and when hydraulic oil passes through the second branch pipeline, the one-way oil return valve 19 is automatically opened and prevents oil from flowing back; the secondary filtering system is arranged between a second oil return electromagnetic valve 18 and a one-way oil return valve 19 of a second branch pipeline, and sequentially comprises two impurity removing filters 20 and a vacuum filter 21, the two impurity removing filters 20 are connected to the second branch pipeline through parallel pipelines, a third oil return electromagnetic valve 24 is arranged on each parallel pipeline, under the condition that one of the impurity removing filters is blocked or damaged, the impurity removing filters can be automatically switched to the other filter through controlling the third oil return electromagnetic valve 24 on each parallel pipeline to filter, the two impurity removing filters 20 can adopt a common filter capable of filtering out 10-100 mu m solid particles or a fine filter capable of filtering out 3-10 mu m solid particles, and the vacuum filter 21 can separate water in oil liquid in a heating mode. As shown in fig. 2, the signal output ends of the first oil particle size detector 4, the second oil particle size detector 15 and the oil moisture detection sensor 16 are respectively connected to the signal input end of the control module 1, and the signal output end of the control module 1 is respectively connected to the control ends of the first one-way oil outlet electromagnetic valve 8, the first hydraulic pump 6, the first oil return electromagnetic valve 17, the second oil return electromagnetic valve 18 and the two third oil return electromagnetic valves 24.

The first hydraulic pump 6 in the embodiment is a vane pump, and the vane pump is driven to operate by a motor; as shown in fig. 1, a pressure relief protection pipeline is arranged at the oil outlet end of the first hydraulic pump 6, a safety overflow valve 22 and a loading valve 23 of the first hydraulic pump 6 are arranged on the pressure relief protection pipeline, one end of the first hydraulic pump 6 is communicated with the whole oil tank 2, and the other end of the first hydraulic pump is communicated with the safety overflow valve 22. In the embodiment, a plurality of second hydraulic pumps 9 adopt hydraulic variable pumps, and an impurity removal filter 20 adopts a filter of 350LEN0630 model of West Defu corporation; the first oil liquid granularity detector 4 and the second oil liquid granularity detector 15 are particle detectors of JCQM-6600 model number, beijing Jenji, inc.

As shown in fig. 1, the protection cutting device of the shield machine hydraulic system real-time monitoring protection system in the embodiment includes a second hydraulic pump 9 arranged on a hydraulic pipeline connecting an oil outlet of a whole oil tank 2 and an oil inlet of each set of shield machine hydraulic subsystem 11, a one-way oil inlet electromagnetic valve 10 arranged at an inlet end of the second hydraulic pump 9, a second one-way oil outlet electromagnetic valve 12 arranged at an oil drain port of the second hydraulic pump 9, a second oil return pipe 13 connecting the second one-way oil outlet electromagnetic valve 12 and the whole oil tank 2, and a hydraulic oil temperature sensor 14 arranged on an oil pipe loop; the signal output end of a hydraulic oil temperature sensor 14 of each set of shield tunneling machine hydraulic subsystem protection and cutting device can be connected with the signal input end of the control module 1, and the signal output end of the control module 1 is connected with the motor control end of a second hydraulic pump 9 of each set of shield tunneling machine hydraulic subsystem protection and cutting device. The utility model discloses the protection device that cuts off that adopts is easy and simple to handle and excellent in use effect, when the installation with change by the examination hydraulic pump, can self-sealing hydraulic line, makes things convenient for the installation and the change of hydraulic pump.

The utility model discloses a sampling monitoring device can carry out two kinds of sampling modes on the hydraulic pump casing returns oil pipe way; one is manual sampling, and is completely closed after sampling, so that the monitoring and cutting-off device is ensured to work safely and reliably; the other is automatic monitoring, is electrically connected with a PLC main controller, and can accurately detect the content of particulate matters in return oil and feed back the content in real time; in an embodiment, the monitoring is automatic.

The utility model discloses a working process: when a hydraulic system of the shield machine normally operates, whether the temperature of hydraulic oil at the inlet of each hydraulic subsystem of the shield machine is normal is detected through the hydraulic oil temperature sensor 14, detection data can be uploaded to the control module 1 (PLC main controller) in real time, and if the temperature of the hydraulic oil is too high, the PLC main controller immediately controls the second hydraulic pump 9 of the subsystem to stop working so as to protect the hydraulic system of the subsystem. Meanwhile, in the normal operation process of the hydraulic system of the shield tunneling machine, the quality and the impurity content of the oil are detected by the first oil particle size detector 4, and detection data are uploaded to the control module 1 (a PLC main controller) in real time; when the impurity concentration in the oil is detected to be over standard, the PLC main controller can control the first one-way oil outlet electromagnetic valve 8 to be opened, the PLC main controller is arranged, after the first one-way oil outlet electromagnetic valve 8 is opened for one minute, the first hydraulic pump 6 is controlled to be opened, the oil in the whole oil tank 2 firstly enters the oil filtering tank 5, the original cavity at the lower part of the oil filtering tank 5 is filled with the hydraulic oil, at the moment, the first hydraulic pump 6 is opened to filter the hydraulic oil in the whole oil tank 2, the hydraulic oil containing impurities in the whole oil tank 2 directly enters the lower crude oil cavity 501 of the oil filtering tank 5 through the oil outlet pipe 200, and the oil filtering tank 5 can be arranged below the whole oil tank 2 in order to facilitate the hydraulic oil in the whole oil tank 2 to automatically enter the oil filtering tank 5; the filtered hydraulic oil of the oil filtering tank 5 is sent to the second oil granularity detector 15 and the oil moisture detection sensor 16 on the first oil return pipe 201 of the first oil return pipe 201 through the first hydraulic pump 5 to detect the filtered hydraulic oil, after the detection is qualified, the PLC master controller controls the first oil return electromagnetic valve 17 to be opened, at the moment, the second oil return electromagnetic valve 18 is closed, and the filtered oil directly returns to the whole oil tank 2; if the detection is unqualified, the PLC master controller controls the first oil return electromagnetic valve 17 to be closed, controls the second oil return electromagnetic valve 18 to be opened, then the filtered oil is subjected to secondary filtration sequentially through an impurity removal filter 20 and a vacuum filter 21, and then returns to the whole oil tank 2 through a one-way oil return valve 19, and the filtered impurities can be discharged through a residue discharge valve 503 at the bottom of the oil filtering tank 5. The utility model discloses can filter the hydraulic oil of whole machine oil tank 2 through hydraulic oil on-line monitoring filter equipment, guarantee that shield constructs quick-witted hydraulic system's hydraulic oil meet the requirements all the time.

The above description is only one embodiment of the present invention, and the description is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. The utility model provides a shield constructs quick-witted hydraulic system real-time supervision protection system which characterized in that: the monitoring and protecting system comprises a control module (1), a hydraulic oil online monitoring and filtering device and a protecting and cutting device for arranging an oil inlet of each set of shield machine hydraulic subsystem;

the hydraulic oil on-line monitoring and filtering device comprises a sampling monitoring device and an oil tank circulating and filtering device; the sampling monitoring device comprises a sampling port (3) arranged on a whole oil tank (2) of a hydraulic system of the shield tunneling machine and a first oil granularity detector (4) arranged at the sampling port (3), wherein the signal output end of the first oil granularity detector (4) is connected with the signal input end of the control module (1); the oil tank circulating filter device comprises a filtering oil tank (5) and a first hydraulic pump (6), the filtering oil tank (5) is internally divided into an upper filtering oil cavity (500) and a lower crude oil cavity (501) through a filter screen plate (7), the bottom of the whole oil tank (2) is connected with the lower crude oil cavity (501) of the filtering oil tank (5) through an oil outlet pipe (200), the lower crude oil cavity (501) is lower than the height of an oil outlet of the whole oil tank (2), a first one-way oil outlet electromagnetic valve (8) is arranged on the oil outlet pipe (200), and the upper filtering oil cavity (500) is communicated with the whole oil tank (2) through a first oil return pipe (201); the signal output end of the control module (1) is respectively connected with the first one-way oil outlet electromagnetic valve (8) and the control end of the first hydraulic pump (6);

the protection cutting device comprises a second hydraulic pump (9) arranged on a hydraulic pipeline connecting an oil outlet of the whole oil tank (2) and an oil inlet of each set of shield machine hydraulic subsystem (11), a one-way oil inlet electromagnetic valve (10) arranged at the inlet end of the second hydraulic pump (9), a second one-way oil outlet electromagnetic valve (12) arranged at an oil drainage port of the second hydraulic pump (9), a second oil return pipe (13) connecting the second one-way oil outlet electromagnetic valve (12) and the whole oil tank (2), and a hydraulic oil temperature sensor (14) arranged on an oil pipe loop; the signal output end of a hydraulic oil temperature sensor (14) of each set of shield tunneling machine hydraulic subsystem protection and cutoff device can be connected with the signal input end of a control module (1), and the signal output end of the control module (1) is connected with the motor control end of a second hydraulic pump (9) of each set of shield tunneling machine hydraulic subsystem protection and cutoff device.

2. The real-time monitoring and protecting system of the hydraulic system of the shield tunneling machine according to claim 1, characterized in that: the oil tank circulating filter device further comprises a second oil particle size detector (15), an oil moisture detection sensor (16) and a secondary filter system, wherein the second oil particle size detector (15), the oil moisture detection sensor (16) and the secondary filter system are arranged on the first oil return pipe (201), the first oil return pipe (201) sequentially passes through the first hydraulic pump (6), the second oil particle size detector (15) and the oil moisture detection sensor (16) to form two branch pipelines, a first oil return electromagnetic valve (17) is arranged on the first branch pipeline, a second oil return electromagnetic valve (18) and a one-way oil return valve (19) are arranged on the second branch pipeline, and the secondary filter system is arranged between the second oil return electromagnetic valve (18) and the one-way oil return valve (19) of the second branch pipeline and sequentially comprises an impurity removal filter (20) and a vacuum filter (21); and the signal output ends of the second oil particle size detector (15) and the oil moisture detection sensor (16) are respectively connected with the signal input end of the control module (1), and the signal output end of the control module (1) is respectively connected with the first oil return electromagnetic valve (17) and the second oil return electromagnetic valve (18).

3. The real-time monitoring and protecting system for the hydraulic system of the shield tunneling machine according to claim 1 or 2, characterized in that: the oil filtering tank (5) is provided with a liquid level observation hose (502) extending from top to bottom, the liquid level observation hose (502) is provided with liquid level scales from top to bottom, and the bottom of the oil filtering tank (5) is provided with a slag discharging valve (503).

4. The real-time monitoring and protecting system of the hydraulic system of the shield tunneling machine according to claim 1 or 2, characterized in that: the first hydraulic pump (6) is a vane pump and is driven to operate by a motor; the oil outlet end of the first hydraulic pump (6) is provided with a pressure relief protection pipeline, the pressure relief protection pipeline is provided with a safety overflow valve (22) and a loading valve (23) of the first hydraulic pump (6), one end of the first hydraulic pump (6) is communicated with the whole oil tank (2), and the other end of the first hydraulic pump is communicated with the safety overflow valve (22).

5. The real-time monitoring and protecting system for the hydraulic system of the shield tunneling machine according to claim 1 or 2, characterized in that: the control module (1) adopts a PLC controller, the control module (1) is in signal connection with a control system of the shield machine operation room, transmits signals to the control system of the shield machine operation room, and displays and controls the signals through a control panel of the shield machine operation room.

6. The real-time monitoring and protecting system of the hydraulic system of the shield tunneling machine according to claim 2, characterized in that: impurity removal filter (20) are equipped with two, and two impurity removal filters (20) are connected on second branch pipeline through parallel pipeline, and are equipped with third oil return solenoid valve (24) on every parallel pipeline, the signal output part of control module (1) is connected with the control end of two third oil return solenoid valves (24).