Hydraulic system of excavator

Abstract

The invention discloses an excavator hydraulic system, a pipeline system comprises a double-path node module, a double-pipeline module and a shunting and merging module, a monitoring system comprises an oil pressure monitoring module, a pipeline switching module and a terminal display module, and an alarm system comprises a fault judgment module and an alarm prompt module. By designing a double-path pipeline system and control, operation of single and double pipelines can be switched, flow division and pressure division are achieved, meanwhile, the oil pressure state is monitored in real time in cooperation with an oil pressure sensor and a flow meter, when a single-side pipeline is damaged, the single-side pipeline is blocked in time, a normal pipeline on the other side continues to operate, shutdown for overhauling is not needed, and the working efficiency is improved. Maintenance can be selected after construction on the same day is finished, the situation that the project progress is affected by maintenance during construction is avoided, loss is avoided, the corresponding position of the damaged pipeline can be visually observed in combination with the terminal display module, manual searching is not needed, maintenance is convenient and fast, and time and labor are saved.

Description

Technical Field

[0001] The present invention relates to the technical field of excavators, and in particular to an excavator hydraulic system. Background Art

[0002] An excavator is an earth-moving machine that uses a bucket to dig materials above or below the surface of the machine and load them into a transport vehicle or unload them to a stockpile. The excavated materials are mainly soil, coal, silt, and pre-loosened soil and rock. From the development of construction machinery in recent years, the development of excavators is relatively fast. Excavators are one of the most important construction machinery in engineering construction.

[0003] The current hydraulic system of an excavator can only perform overall fault diagnosis. The location of the ruptured pipeline and oil leakage needs to be manually found during maintenance, and accurate positioning cannot be achieved. At the same time, the current hydraulic pipelines of excavators are mostly single-tube hydraulic oil conveying. When a pipeline is damaged, the machine needs to be shut down, which affects the construction progress and causes certain losses. For example, an excavator hydraulic system disclosed in application No. 201120219896.4 reduces the engine output power while avoiding overflow losses through the cooperation of a pilot oil circuit and a main oil circuit. However, the main oil circuit of this pipeline is still a single-tube design. When it is damaged, the machine still needs to be shut down for maintenance, which seriously affects the construction progress. Therefore, the present invention proposes an excavator hydraulic system to solve the problems existing in the prior art. Summary of the invention

[0004] In view of the above problems, an object of the present invention is to provide an excavator hydraulic system.

[0005] To achieve the purpose of the present invention, the present invention is implemented through the following technical solutions: an excavator hydraulic system, including a pipeline system, a monitoring system and an alarm system, the pipeline system including a dual-path node module, a dual-pipeline module and a shunt merging module, the dual-path node module is connected to the dual-pipeline module through a double-row fixed metal pipe, the double-row fixed metal pipe is fixedly installed on the mechanical arm of the excavator and both ends of the two groups of metal pipes are installed with electric control valves, oil pressure sensors and flow sensors, the dual-pipeline module is used for the shunt transportation of hydraulic oil, and is connected between two groups of dual-path node modules, the shunt merging module is used for the hydraulic oil to be shunt from the oil tank output to the oil cylinder end and input in parallel, under normal circumstances, the dual-path pipeline can greatly share the pressure of the oil pressure when the excavator is working, and when the pipeline is damaged and leaks oil, the corresponding damaged pipeline is cut off in time to enter the single-pipeline working state, effectively avoiding the shutdown caused by the damage of the oil pipeline during the traditional single-pipeline oil transportation;

[0006] The monitoring system includes an oil pressure monitoring module, a pipeline switching module and a terminal display module. The oil pressure monitoring module monitors the oil pressure status of each section of the pipeline in real time through the oil pressure sensors at both ends of each section of the dual-pipeline module, and monitors the hydraulic oil flow rate in the pipeline in real time through the flow sensor, so as to detect the blockage of the hydraulic oil filter caused by excessive impurities in the pipeline; the pipeline switching module controls the unilateral switching or dual-path operation of the hydraulic oil delivery pipeline by controlling the electric control valve at the rear end of the oil pressure sensor at both ends of each section of the dual-pipeline module; the terminal display module is used to simulate and display the pipeline system status and the real-time data of the oil pressure sensor and the state control of the electric control valve through the computer end;

[0007] The alarm system includes a fault judgment module and an alarm prompt module. The fault judgment module is used to judge the status of the pipeline system based on the real-time monitoring data of the oil pressure sensor, which is divided into faults such as pipeline damage and oil leakage and excessive impurities in the pipeline causing filter clogging resulting in reduced oil pressure; the alarm prompt module is used to issue fault alarms and prompts based on the judgment results.

[0008] A further improvement is that the diversion and merging module includes a hydraulic oil master control node, which is arranged at the output end of the hydraulic oil tank pump. The hydraulic oil master control node is used to control the flow of hydraulic oil pipelines to different cylinders to make the excavator perform different actions. When multiple groups of cylinders of the excavator work at the same time, the system automatically increases the engine power so that the oil pump power is increased and the hydraulic oil is evenly pressured and delivered to the corresponding cylinders.

[0009] A further improvement is that the oil pressure monitoring module includes a signal acquisition submodule and a data conversion and display submodule. The signal acquisition submodule acquires real-time oil pressure data and real-time pipeline flow data based on the oil pressure sensor and the flow sensor and outputs electrical signals. The data conversion and display submodule is used to convert the electrical signals output by the oil pressure sensor and the flow sensor into digital signals and intuitively display the data.

[0010] Further improvements are: the pipeline switching module includes a manual control submodule and an automatic control submodule, the manual control submodule is used to select the start and stop of the control electric control valve from the terminal display module, so as to realize manual switching of the single-pipe or double-pipe operation mode, and the automatic control submodule is used to control the start and stop of the electric control valve on the corresponding pipeline according to the data monitored by the oil pressure monitoring module. When the pipeline is damaged, the electric control valves at the connection between the two ends of the corresponding pipeline and the dual-path node module are automatically closed to seal the two ends of the damaged oil pipe, and immediately switch to the single-pipe working mode.

[0011] Further improvements are: the terminal display module is implemented based on a touch display screen, and manual touch setting and viewing are convenient and fast. The terminal display module includes a pipeline modeling submodule and a mode setting submodule. The pipeline modeling submodule establishes a 3D simulation diagram of the excavator hydraulic pipeline based on 3D modeling software and monitors the various data of the corresponding monitoring nodes in real time. When the pipeline is damaged, the pipeline at the corresponding position on the 3D simulation diagram of the pipeline will become a flashing red wire and the fault status will be displayed on the display screen. The mode setting submodule is used to manually adjust the single-pipeline oil transportation mode or the dual-pipe parallel oil transportation mode of the pipeline according to usage requirements.

[0012] A further improvement is that the fault judgment module includes a model building submodule and a data processing submodule. The model building submodule is used to establish a fault diagnosis model for determining the cause of hydraulic faults based on oil pressure data fluctuations. The data processing submodule is used to organize and calculate the acquired data to obtain a model input data set. This data set is used as the input of the fault judgment model to obtain the real-time status of the hydraulic system.

[0013] A further improvement is that the fault judgment module also includes a data storage submodule and a model update submodule. The data storage submodule is used to store a historical data set of hydraulic oil delivery faults. The model update submodule trains and verifies the model based on the historical fault data, and uses new fault data that occurs during operation to self-learn and update the model.

[0014] Further improvements are: the alarm prompt module includes an information display submodule and an sound and light alarm submodule, the information display submodule is used to divide the judged fault information and display the judgment result information and the corresponding fault section dual-pipeline module position on the terminal display module, the sound and light alarm submodule is used to immediately give an alarm prompt through a sound and light alarm when a pipeline damage fault is detected, and when it is judged that the hydraulic oil filter is clogged and the oil pressure is reduced, the sound and light alarm is not triggered, but an alarm pop-up window pops up and flashes on the terminal display module.

[0015] A further improvement is that the information display submodule further includes a fault level classification submodule, and the fault level classification submodule classifies the fault type and fault information judged by the model according to the fault classification threshold value imported in advance.

[0016] A further improvement is that the sound and light alarm submodule also includes a sound and light control submodule, which is used to control the mode of the sound and light alarm according to the division result of the information display submodule, and the modes include light flashing mode, sound prompt mode, sound and light low-frequency synchronous flashing mode and sound and light high-frequency flashing mode.

[0017] The beneficial effects of the present invention are as follows: the present invention can switch between single and double pipeline operation by designing a dual-path pipeline system and control, realizes flow diversion and pressure division, and cooperates with the oil pressure sensor and the flow meter to monitor the oil pressure status in real time. When the pipeline on one side is damaged, the pipeline on the one side is promptly blocked and the normal pipeline on the other side is used to continue operation. There is no need to stop for maintenance, and maintenance can be carried out after the construction is completed on the same day, avoiding the maintenance during construction affecting the progress of the project, thereby avoiding losses. In combination with the terminal display module, the corresponding position of the damaged pipeline can be intuitively observed without manual search, and maintenance is convenient and fast, saving time and effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a system architecture diagram of the present invention.

[0019] Figure 2 This is a double-pipeline structure diagram of the present invention. DETAILED DESCRIPTION

[0020] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with examples. The examples are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0021] according to Figure 1 and Figure 2 As shown, this embodiment provides an excavator hydraulic system, including a pipeline system, a monitoring system and an alarm system. The pipeline system includes a dual-path node module, a dual-pipeline module and a diversion and merging module. The dual-path node module is connected to the dual-pipeline module through a double-row fixed metal pipe. The double-row fixed metal pipe is fixedly installed on the mechanical arm of the excavator and both ends of the two groups of metal pipes are installed with electric control valves, oil pressure sensors and flow sensors, which are all electrically connected to the terminal display module. The dual-pipeline module is used for diversion and transportation of hydraulic oil, and is connected between two groups of dual-path node modules. The diversion and merging module is used for the hydraulic oil to be diverted from the oil tank output to the cylinder end and input in parallel. Under normal circumstances, the dual-path pipeline can greatly share the pressure of the oil pressure when the excavator is working, and when the pipeline is damaged and leaks oil, the corresponding damaged pipeline is cut off in time to enter the single-pipeline working state, which effectively avoids the shutdown caused by the damage of the oil pipeline during traditional single-pipeline oil transportation.

[0022] The diversion and merging module includes a hydraulic oil master control node, which is set at the output end of the hydraulic oil tank pump. The hydraulic oil master control node is used to control the flow of hydraulic oil pipelines to different cylinders to make the excavator perform different actions. When multiple groups of cylinders of the excavator work at the same time, the system automatically increases the engine power so that the oil pump power is increased to evenly transport the hydraulic oil to the corresponding cylinders.

[0023] The monitoring system includes an oil pressure monitoring module, a pipeline switching module and a terminal display module. The oil pressure monitoring module monitors the oil pressure status of each section of the pipeline in real time through the oil pressure sensors at both ends of each dual-pipeline module, and monitors the hydraulic oil flow rate in the pipeline in real time through the flow sensor, so as to detect the blockage of the hydraulic oil filter caused by excessive impurities in the pipeline. The oil pressure monitoring module includes a signal acquisition submodule and a data conversion and display submodule. The signal acquisition submodule acquires real-time oil pressure data and real-time pipeline flow data based on the oil pressure sensor and the flow sensor and outputs electrical signals. The data conversion and display submodule is used to convert the electrical signals output by the oil pressure sensor and the flow sensor into digital signals and intuitively display the data.

[0024] The pipeline switching module controls the unilateral switching or dual-path operation of the hydraulic oil delivery pipeline by controlling the electric control valve at the rear end of the oil pressure sensor at both ends of each dual-pipeline module. The pipeline switching module includes a manual control submodule and an automatic control submodule. The manual control submodule is used to select the start and stop of the electric control valve from the terminal display module to realize manual switching of the single-pipe or dual-pipe operation mode. The automatic control submodule is used to control the start and stop of the electric control valve on the corresponding pipeline according to the data monitored by the oil pressure monitoring module. When the pipeline is damaged, the electric control valve at the connection between the two ends of the corresponding pipeline and the dual-path node module is automatically closed to seal the two ends of the damaged oil pipe, and immediately switch to the single-pipe working mode.

[0025] The terminal display module is used to simulate and display the pipeline system status, real-time data of the oil pressure sensor and the status control of the electronic control valve through the computer. The terminal display module is implemented based on a touch screen, and is convenient and quick to set and view manually by touch. The terminal display module includes a pipeline modeling submodule and a mode setting submodule. The pipeline modeling submodule establishes a 3D simulation diagram of the excavator hydraulic pipeline based on 3D modeling software and monitors the various data of the corresponding monitoring nodes in real time. When the pipeline is damaged, the pipeline at the corresponding position on the 3D simulation diagram of the pipeline will become a flashing red wire, and the fault status will be displayed on the display screen. The mode setting submodule is used to manually adjust the single-pipe oil transportation mode or the dual-pipe parallel oil transportation mode of the pipeline according to usage requirements.

[0026] The alarm system includes a fault judgment module and an alarm prompt module. The fault judgment module is used to judge the status of the pipeline system according to the real-time monitoring data of the oil pressure sensor, which is divided into faults such as pipeline damage and oil leakage, excessive impurities in the pipeline and filter clogging resulting in reduced oil pressure. The fault judgment module includes a model building submodule and a data processing submodule. The model building submodule is used to establish a fault diagnosis model for judging the cause of hydraulic faults based on the fluctuation of oil pressure data. The data processing submodule is used to organize and calculate the acquired data to obtain a model input data set. This data set is used as the input of the fault judgment model to obtain the real-time status of the hydraulic system.

[0027] The fault judgment module also includes a data storage submodule and a model update submodule. The data storage submodule is used to store the historical data set of hydraulic oil delivery faults. The model update submodule trains and verifies the model based on the historical fault data, and uses the new fault data that appears during the operation process to self-learn and update the model. Self-learning and updating can automatically optimize and improve the fault judgment model without manual import of data updates, which is convenient and fast.

[0028] The alarm prompt module is used to issue fault alarms and prompts based on the judgment results. The alarm prompt module includes an information display submodule and an sound and light alarm submodule. The information display submodule is used to display the judgment result information and the corresponding fault section dual-pipeline module position on the terminal display module. The sound and light alarm submodule is used to immediately issue an alarm prompt through a sound and light alarm when a pipeline damage fault is detected. When it is judged that the hydraulic oil filter is clogged and the oil pressure is reduced, the sound and light alarm is not triggered, but an alarm pop-up window pops up and flashes on the terminal display module.

[0029] The information display submodule also includes a fault level classification submodule. The fault level classification submodule classifies the fault type and fault information judged by the model based on the fault classification threshold imported in advance. When the system is imported, the corresponding data threshold is synchronously imported into the system according to the hydraulic system fault judgment standard to facilitate automatic judgment and classification in the later stage.

[0030] The sound and light alarm submodule also includes a sound and light control submodule, which is used to control the mode of the sound and light alarm according to the division results of the information display submodule. The modes include light flashing mode, sound prompt mode, sound and light low-frequency synchronous flashing mode and sound and light high-frequency flashing mode.

[0031] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An excavator hydraulic system, characterized in that: The utility model comprises a pipeline system, a monitoring system and an alarm system. The pipeline system comprises a dual-path node module, a dual-pipeline module and a flow splitting and merging module. The dual-path node module is connected to the dual-pipeline module through a double-row fixed metal pipe. The dual-pipeline module is used for the flow splitting and delivery of hydraulic oil. The flow splitting and merging module is used for the hydraulic oil to be output from the oil tank and then flow split to the cylinder end and input in parallel. The monitoring system comprises an oil pressure monitoring module, a pipeline switching module and a terminal display module. The oil pressure monitoring module monitors the oil pressure state of each section of the pipeline in real time through the oil pressure sensors at both ends of each section of the dual-pipeline module. The pipeline switching module controls the unilateral switching of the hydraulic oil delivery pipeline by controlling the electric control valve at the rear end of the oil pressure sensor at both ends of each section of the dual-pipeline module. The terminal display module is used to simulate and display the pipeline system state and the real-time data of the oil pressure sensor and the state control of the electric control valve through the computer end. The alarm system comprises a fault judgment module and an alarm prompt module. The fault judgment module judges the pipeline system state based on the fault diagnosis model combined with the real-time monitoring data of the oil pressure sensor. The alarm prompt module is used to issue a fault alarm and prompt according to the judgment result.

2. The hydraulic system for an excavator according to claim 1, characterized in that: The flow splitting and merging module includes a hydraulic oil master control node, which is arranged at the output end of the hydraulic oil tank pump. The hydraulic oil master control node is used to control the pipeline flow of the hydraulic oil to different cylinders to enable the excavator to perform different actions.

3. The hydraulic system for an excavator according to claim 1, characterized in that: The oil pressure monitoring module includes a signal acquisition submodule and a data conversion and display submodule. The signal acquisition submodule acquires real-time oil pressure data based on the oil pressure sensor and outputs an electrical signal. The data conversion and display submodule is used to convert the electrical signal output by the oil pressure sensor into a digital signal and intuitively display the data.

4. The hydraulic system for an excavator according to claim 1, characterized in that: The pipeline switching module includes a manual control submodule and an automatic control submodule. The manual control submodule is used to select the start and stop of the control electric control valve from the terminal display module, and the automatic control submodule is used to control the start and stop of the electric control valve on the corresponding pipeline according to the data monitored by the oil pressure monitoring module.

5. The hydraulic system for an excavator according to claim 1, characterized in that: The terminal display module is implemented based on a touch display screen. The terminal display module includes a pipeline modeling submodule and a mode setting submodule. The pipeline modeling submodule establishes a 3D simulation diagram of the excavator hydraulic pipeline based on 3D modeling software and monitors various data of the corresponding monitoring nodes in real time. The mode setting submodule is used to manually adjust the single-pipeline oil transportation mode or the dual-pipe parallel oil transportation mode of the pipeline according to usage requirements.

6. The hydraulic system for an excavator according to claim 1, characterized in that: The fault judgment module includes a model building submodule and a data processing submodule. The model building submodule is used to establish a fault diagnosis model for judging the cause of hydraulic fault according to the fluctuation of oil pressure data. The data processing submodule is used to organize and calculate the acquired data to obtain a model input data set.

7. The hydraulic system for an excavator according to claim 1, characterized in that: The fault judgment module also includes a data storage submodule and a model update submodule. The data storage submodule is used to store a historical data set of hydraulic oil delivery faults. The model update submodule trains and verifies the model based on the historical fault data, and uses new fault data that occurs during operation to self-learn and update the model.

8. The hydraulic system for an excavator according to claim 1, characterized in that: The alarm prompt module includes an information display submodule and an audio-visual alarm submodule. The information display submodule is used to divide the judged fault information and display the judgment result information and the corresponding fault section dual-pipeline module position on the terminal display module. The audio-visual alarm submodule is used to immediately issue an alarm prompt through an audio-visual alarm when a fault is detected.

9. The hydraulic system for an excavator according to claim 8, characterized in that: The information display submodule further includes a fault level classification submodule, and the fault level classification submodule classifies the fault types and fault information judged by the model according to the fault classification threshold value imported in advance.

10. The hydraulic system for an excavator according to claim 8, characterized in that: The sound and light alarm submodule also includes a sound and light control submodule, which is used to control the mode of the sound and light alarm according to the division result of the information display submodule, and the modes include light flashing mode, sound prompt mode, sound and light low-frequency synchronous flashing mode and sound and light high-frequency flashing mode.

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