Hydraulic system of movable hydraulic shear

Abstract

The invention provides a hydraulic system of a movable hydraulic shear, and relates to the technical field of data processing.The method comprises the steps that pressure data, flow velocity data and temperature data of hydraulic oil in the shearing process are collected, redundant data are removed, unit dimensions are unified, whether abnormal pressure fluctuation occurs in current shearing or not is analyzed according to the pressure data, and the abnormal pressure fluctuation is determined; calculating a target pressure value of the hydraulic oil in the shearing process, adjusting an output pressure value of a hydraulic pump to the target pressure value, analyzing whether oil return flow fluctuation is caused by opening value change of an oil return channel or not according to the flow velocity data, calculating a target opening value of the oil return channel, adjusting the opening value of the oil return channel to the target opening value, and adjusting the output pressure value of the hydraulic pump to the target pressure value according to the temperature data. And judging whether the hydraulic oil has an abnormal temperature rise phenomenon or not, calculating a target opening time length of the cooling loop, and maintaining the opening time length of the cooling loop to the target opening time length. The stability of the hydraulic shear is improved by adjusting the pressure, the flow speed and the temperature of the hydraulic system.

Description

Technical Field

[0001] The invention relates to the technical field of data processing, in particular to a hydraulic system of a mobile hydraulic shear. Background Art

[0002] Mobile hydraulic shears are widely used to shear metal components, scrap steel and other materials. Existing mobile hydraulic shears usually use a hydraulic system to drive the shearing mechanism to provide sufficient shearing force. The hydraulic system is generally composed of components such as a hydraulic pump, a hydraulic valve and a hydraulic cylinder. When working, the hydraulic pump provides high-pressure oil to push the hydraulic cylinder to drive the shear blade to perform shearing operations. Some equipment uses manual or electronically controlled reversing valves to control the shearing action, which can meet general metal shearing needs. However, in actual applications, the shearing process is often affected by factors such as load changes and oil temperature fluctuations, which may cause the hydraulic system to respond laggingly or the pressure to be unstable, reducing the shearing quality and the service life of the equipment.

[0003] For example, when processing thick-walled steel pipes or high-strength steel, the hydraulic system may experience a sudden pressure rise or poor oil return, causing the hydraulic oil to generate local high temperature during high-load shearing. High temperature may cause the viscosity of the hydraulic oil to decrease, causing slight unevenness in the movement of the hydraulic cylinder, which in turn affects the synchronization of the shear blades, resulting in uneven shearing sections or unbalanced blade loading, aggravating the wear of the blades and hydraulic cylinders, and reducing the stability and service life of the equipment. Summary of the invention

[0004] The object of the present invention is to provide a hydraulic system of a mobile hydraulic shear, aiming to solve the problems mentioned in the background technology.

[0005] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0006] A hydraulic system for a mobile hydraulic shear, the system comprising:

[0007] A data acquisition module is used to collect pressure data, flow rate data and temperature data of the hydraulic oil during the shearing process to obtain an initial data set;

[0008] A data preprocessing module is used to preprocess the initial data set, remove redundant data and unify the unit dimension to obtain a hydraulic oil data set;

[0009] The pressure analysis module is used to draw a pressure change curve of the hydraulic oil pressure changing with time during the shearing process according to the pressure data in the hydraulic oil data set, and calculate the pressure change gradient based on it to analyze whether abnormal pressure fluctuation occurs in the current shearing, and obtain the load adjustment instruction;

[0010] A load adjustment module, used to calculate the target pressure value of the hydraulic oil during the shearing process according to the load adjustment instruction, and adjust the output pressure value of the hydraulic pump to the target pressure value according to the load adjustment instruction;

[0011] The flow rate analysis module is used to calculate the change rate of the return oil flow in adjacent time periods according to the flow rate data in the hydraulic oil data set, obtain the instantaneous return oil change rate, and extract the return oil opening value of the return oil channel based on it, analyze whether the return oil flow fluctuation is caused by the change of the opening value of the return oil channel, and obtain the return oil adjustment instruction;

[0012] The opening adjustment module is used to calculate the target opening value of the oil return channel according to the oil return adjustment instruction, and adjust the opening value of the oil return channel to the target opening value according to the target opening value;

[0013] The temperature analysis module is used to calculate the temperature change rate of the hydraulic oil per unit time according to the temperature data in the hydraulic oil data set, and to determine whether there is an abnormal temperature rise phenomenon of the hydraulic oil based on the temperature data, and obtain a cooling adjustment instruction;

[0014] The cooling regulation module is used to calculate the target opening time of the cooling circuit according to the cooling regulation instruction, and maintain the opening time of the cooling circuit to the target opening time according to the cooling regulation instruction.

[0015] Furthermore, the pressure analysis module includes:

[0016] A pressure curve generating unit is used to determine the instantaneous pressure value of the hydraulic oil according to the pressure data at a preset time point, and to construct a pressure change curve of the pressure changing with time based on the pressure data;

[0017] A pressure gradient calculation unit is used to perform differential processing on the pressure change curve and calculate the pressure change gradient at each time point;

[0018] An abnormal pressure identification unit is used to detect whether the pressure change at each time point exceeds a preset pressure threshold according to the pressure change gradient, and generate an abnormal pressure fluctuation signal;

[0019] The load adjustment instruction generating unit is used to calculate the pressure correction amount in the shearing process according to the abnormal pressure fluctuation signal and generate the load adjustment instruction.

[0020] Furthermore, the load adjustment module includes:

[0021] A target pressure calculation unit, used for calculating a target pressure value of the hydraulic pump during the shearing process according to a pressure correction amount;

[0022] A pressure adjustment step length determination unit, used to calculate a pressure deviation according to a target pressure value and an actual output pressure value, and calculate a pressure adjustment step length therefrom to generate a pressure adjustment instruction;

[0023] The pressure feedback control unit is used to gradually adjust the output pressure value of the hydraulic pump according to the pressure adjustment instruction so that it approaches the target pressure value, and ensure the pressure stability during shearing by real-time monitoring the pressure changes after adjustment.

[0024] Furthermore, the calculation formula of the pressure adjustment step is: ;

[0025] in, is the pressure adjustment step size, is the target pressure value, is the actual output pressure value, is the pressure deviation, To cut the length of the item, To cut the thickness of the item, is the maximum adjustment step allowed for the hydraulic pump, , is the theoretical adjustment step size, is the minimum function, when When ,when ,but , are coefficients respectively.

[0026] Further, the flow rate analysis module includes:

[0027] The oil return flow rate change calculation unit is used to calculate the change rate of the oil return flow rate in adjacent time periods according to the flow rate data, obtain the instantaneous oil return change rate, and record the distribution of the instantaneous oil return change rate in each time period to form a flow fluctuation sequence;

[0028] The oil return opening extraction unit is used to extract the oil return opening value of the oil return channel in the corresponding time period according to the flow fluctuation sequence, and establish the correlation relationship between the oil return opening value and the instantaneous oil return change rate based on it to obtain the oil return opening flow relationship data set;

[0029] The opening matching analysis unit is used to calculate the actual return oil opening deviation value of the return oil channel in the current time period according to the return oil opening flow relationship data set, and to determine whether the return oil flow fluctuation is caused by the change in the opening value. When the result is yes, an oil return adjustment instruction is generated.

[0030] Furthermore, the oil return opening extraction unit comprises:

[0031] The opening data acquisition unit is used to synchronously acquire the opening value of the oil return channel in the corresponding time period according to the flow fluctuation sequence to obtain the opening value sequence;

[0032] A data pairing unit is used to pair the change in the opening value of the oil return channel with the change in the instantaneous oil return change rate in adjacent time periods according to the opening value sequence and the flow fluctuation sequence, so as to obtain a data set of oil return opening flow change;

[0033] A relationship fitting unit is used to calculate the correlation between the oil return opening value and the instantaneous oil return change rate according to the oil return opening flow change data set, and select a linear regression model based on it, calculate the parameters of the linear regression model, and obtain a fitting model;

[0034] The association relationship storage unit is used to store the fitting model in the oil return opening flow relationship data set, and dynamically update it during the shearing process to ensure that the oil return opening and the instantaneous oil return change rate match each other.

[0035] Furthermore, the opening adjustment module includes:

[0036] The target opening calculation unit is used to calculate the target opening value of the oil return channel according to the oil return adjustment instruction, and calculate the influence of the target opening value after adjustment on the flow rate change rate, so as to obtain the predicted instantaneous oil return change rate;

[0037] The opening dynamic adjustment unit is used to adjust the opening value of the oil return channel in steps according to the actual opening value of the oil return channel, so that it gradually approaches the target opening value;

[0038] The opening feedback correction unit is used to calculate the actual instantaneous oil return change rate after adjustment and compare it with the predicted instantaneous oil return change rate. When there is a deviation, the target opening value is corrected and a secondary adjustment is performed to ensure that the opening value of the oil return channel matches the hydraulic oil flow.

[0039] Furthermore, the temperature analysis module includes:

[0040] A temperature change calculation unit is used to calculate the temperature change rate of the hydraulic oil in adjacent time periods according to the temperature data, and to construct a temperature change curve based on the temperature change rate;

[0041] The temperature rise abnormality detection unit is used to determine whether the temperature change rate exceeds a preset temperature rise threshold value according to the temperature change curve, and generate a temperature abnormality signal when the result is yes;

[0042] The cooling correlation analysis unit is used to calculate the temperature influence coefficient of the opening time of the cooling circuit on the hydraulic oil temperature according to the temperature abnormality signal, and obtain the cooling adjustment instruction.

[0043] Furthermore, the calculation formula of the temperature influence coefficient is: ;

[0044] in, is the temperature influence coefficient, is the initial temperature of the hydraulic oil, is the real-time temperature of the hydraulic oil, is the ambient temperature, is the opening time of the cooling circuit, is the total operating time of the hydraulic pump, is the real-time flow rate of hydraulic oil, is the maximum flow rate allowed by the hydraulic system, is the comprehensive efficiency coefficient of the cooling circuit, is the preset temperature threshold of the hydraulic oil, are coefficients respectively.

[0045] Furthermore, the cooling adjustment module includes:

[0046] A cooling target calculation unit, used to calculate the target opening time of the cooling circuit according to the cooling adjustment instruction, and determine the opening frequency of the cooling circuit according to the target opening time of the cooling circuit in combination with the hydraulic oil temperature change rate;

[0047] The cooling dynamic adjustment unit is used to dynamically adjust the start and stop of the cooling circuit according to the target opening time, opening frequency and temperature influence coefficient to ensure that the hydraulic oil temperature is maintained within the set range;

[0048] The cooling feedback control unit is used to adjust the opening duration and opening frequency of the cooling circuit according to the real-time temperature data of the hydraulic oil. When the actual temperature change rate of the hydraulic oil is still higher than the preset temperature rise threshold, a secondary cooling adjustment instruction is generated to optimize the cooling process.

[0049] The above solution of the present invention includes at least the following beneficial effects:

[0050] The present invention can improve the accuracy and real-time performance of pressure monitoring. Compared with traditional single-point pressure monitoring, by constructing a pressure change curve, it can capture the dynamic changes of hydraulic oil in the shearing process, so that the system can more accurately judge the load conditions in the shearing process. By calculating the pressure change gradient, the system can identify drastic changes in pressure in a short period of time, and judge the sudden change of the shear load accordingly. Compared with the traditional fixed pressure setting mode, this dynamic adjustment method based on real-time data can better adapt to the changes of the shearing object and improve the shearing quality. At the same time, it can avoid the problem of excessive temperature rise of the hydraulic oil caused by excessive pressure, and further extend the service life of the hydraulic system and the shear blade.

[0051] The present invention can realize dynamic adjustment of pressure, so that the hydraulic shears can adapt to the shearing needs of materials of different thicknesses and different hardnesses. In the actual shearing process, due to the different hardness and thickness of the materials, the optimal shearing pressure should also be different. This function can calculate the optimal pressure required in the shearing process in real time and adjust the output of the hydraulic pump to ensure that the blade works within a reasonable pressure range to avoid shearing overload or insufficient shearing. It can also reduce the hydraulic shock caused by sudden pressure changes and improve the stability of the hydraulic system. When the hydraulic shears shear high-strength materials, the pressure of the hydraulic system may rise suddenly, which may cause the internal pressure of the hydraulic cylinder to exceed its bearing range, thereby affecting the service life of the hydraulic cylinder. By gradually adjusting the pressure of the hydraulic pump, it can be smoothly approached to the target pressure value, reducing pressure shock and improving the stability and safety of the shearing process.

[0052] The present invention can accurately monitor the changes in return oil flow, identify abnormal oil return conditions in the hydraulic system, detect whether there is abnormal oil return by calculating the instantaneous change rate of the return oil flow, and timely generate adjustment instructions to optimize the oil return process, thereby avoiding failures of the hydraulic system due to pressure accumulation. It can also effectively reduce the problem of local high temperature of the hydraulic oil, reduce the overall temperature of the hydraulic system, improve the stability of the hydraulic oil, and reduce the influence of temperature on the movement accuracy of the shear blade by optimizing the return oil flow. By optimizing the return oil flow, the movement of the hydraulic cylinder is smoother, the return time is reduced, and the continuity and efficiency of the shearing process are improved. This method can not only improve the productivity of the equipment, but also reduce the loss of the hydraulic system and extend the service life of the equipment.

[0053] The present invention can realize intelligent adjustment of the oil return channel. During the actual shearing process, due to the different thickness and hardness of the sheared material, the optimal value of the oil return flow rate should also change accordingly. The opening of the oil return channel can also be dynamically adjusted according to the real-time data of the oil return flow rate to ensure a smooth oil return process, improve the overall stability of the hydraulic system, effectively reduce the problem of hydraulic oil reflux obstruction, and improve the stability of the shearing process. By automatically adjusting the opening of the oil return channel, the movement of the hydraulic cylinder is optimized, the synchronization of the shearing blades is ensured, the shearing accuracy is improved, the temperature rise of the hydraulic system is reduced, the durability of the equipment and the circulation efficiency of the pressurized oil are improved, the temperature accumulation problem is reduced, and the reliability of the hydraulic system is improved.

[0054] The present invention can accurately monitor the temperature change of hydraulic oil and discover abnormal temperature rise in time. When the hydraulic shears are shearing at high intensity, the temperature of the hydraulic oil may rise rapidly. The temperature change rate can be calculated to predict the trend of the hydraulic oil temperature, thereby reducing the problem of hydraulic oil performance degradation caused by high temperature. It can also reduce the problem of hydraulic oil viscosity reduction caused by excessive temperature and improve the stability of the shearing system. It can also dynamically determine whether cooling adjustment is needed based on the temperature data of the hydraulic oil, so as to keep the hydraulic oil within an appropriate temperature range and ensure the stable operation of the hydraulic system. It can also control the working state of the cooling system and trigger the cooling adjustment instruction only when necessary, so that the cooling system can be started at the most appropriate time to avoid energy waste caused by excessive cooling. This can not only reduce the operating cost of the equipment, but also improve the overall energy efficiency of the hydraulic shears, making the equipment operation more intelligent and energy-saving.

[0055] The present invention can realize intelligent regulation of the cooling system, avoid equipment damage caused by excessively high hydraulic oil temperature, calculate the optimal opening time of the cooling circuit, and automatically adjust the start and stop of the cooling system to ensure that the hydraulic oil temperature is always maintained within an appropriate range. By accurately adjusting the operating time and frequency of the cooling system, the temperature change of the hydraulic oil is kept within a controllable range, thereby ensuring the stability of the hydraulic cylinder movement, improving the shearing quality, and reducing the problem of blade overload that may occur during the shearing process. It can also avoid overheating of the hydraulic oil and improve the durability of the hydraulic system through a reasonable cooling strategy, thereby reducing the long-term operating cost of the equipment and improving the economic benefits of the equipment. It can also calculate the optimal opening time of the cooling circuit according to the real-time temperature and temperature change rate of the hydraulic oil, and reduce unnecessary energy consumption. It can not only reduce the operating cost of the equipment, but also reduce energy waste, and achieve a more environmentally friendly and energy-saving production method. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 It is a flow chart of a hydraulic system of a mobile hydraulic shear provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0057] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0058] like Figure 1 As shown, an embodiment of the present invention provides a hydraulic system of a mobile hydraulic shear, the system comprising:

[0059] A data acquisition module is used to collect pressure data, flow rate data and temperature data of the hydraulic oil during the shearing process to obtain an initial data set;

[0060] A data preprocessing module is used to preprocess the initial data set, remove redundant data and unify the unit dimension to obtain a hydraulic oil data set;

[0061] The pressure analysis module is used to draw a pressure change curve of the hydraulic oil pressure changing with time during the shearing process according to the pressure data in the hydraulic oil data set, and calculate the pressure change gradient based on it to analyze whether abnormal pressure fluctuation occurs in the current shearing, and obtain the load adjustment instruction;

[0062] A load adjustment module, used to calculate the target pressure value of the hydraulic oil during the shearing process according to the load adjustment instruction, and adjust the output pressure value of the hydraulic pump to the target pressure value according to the load adjustment instruction;

[0063] The flow rate analysis module is used to calculate the change rate of the return oil flow in adjacent time periods according to the flow rate data in the hydraulic oil data set, obtain the instantaneous return oil change rate, and extract the return oil opening value of the return oil channel based on it, analyze whether the return oil flow fluctuation is caused by the change of the opening value of the return oil channel, and obtain the return oil adjustment instruction;

[0064] The opening adjustment module is used to calculate the target opening value of the oil return channel according to the oil return adjustment instruction, and adjust the opening value of the oil return channel to the target opening value according to the target opening value;

[0065] The temperature analysis module is used to calculate the temperature change rate of the hydraulic oil per unit time according to the temperature data in the hydraulic oil data set, and to determine whether there is an abnormal temperature rise phenomenon of the hydraulic oil based on the temperature data, and obtain a cooling adjustment instruction;

[0066] The cooling regulation module is used to calculate the target opening time of the cooling circuit according to the cooling regulation instruction, and maintain the opening time of the cooling circuit to the target opening time according to the cooling regulation instruction.

[0067] In an embodiment of the present invention, a data acquisition module is used to collect pressure data, flow rate data and temperature data of the hydraulic oil during the shearing process to obtain an initial data set, and provide data support for subsequent analysis through real-time data collection; a data preprocessing module is used to preprocess the initial data set, remove redundant data and unify unit dimensions to obtain a hydraulic oil data set, and improve data quality and the accuracy of subsequent analysis by removing noise and redundant data; a pressure analysis module is used to draw a pressure change curve of the hydraulic oil pressure changing with time during the shearing process based on the pressure data in the hydraulic oil data set, and calculate the pressure change gradient based on it, analyze whether abnormal pressure fluctuation occurs in the current shearing, and obtain a load adjustment instruction, which can quickly detect abnormal pressure fluctuations and avoid hydraulic shocks caused by sudden load changes; a load adjustment module is used to calculate the target pressure value of the hydraulic oil during the shearing process according to the load adjustment instruction, and adjust the output pressure value of the hydraulic pump to the target pressure value based on it, so as to avoid hydraulic shocks caused by sudden pressure changes and improve the stability and service life of the hydraulic system.

[0068] The flow rate analysis module is used to calculate the change rate of the return oil flow in adjacent time periods based on the flow rate data in the hydraulic oil data set, obtain the instantaneous return oil change rate, and extract the return oil opening value of the return oil channel based on it, analyze whether the return oil flow fluctuation is caused by the change in the opening value of the return oil channel, and obtain the return oil adjustment instruction. By monitoring the change in the return oil flow rate, the stability of the return oil process of the hydraulic system is ensured to avoid pressure accumulation caused by poor oil return; the opening adjustment module is used to calculate the target opening value of the return oil channel according to the return oil adjustment instruction, and adjust the opening value of the return oil channel to the target opening value based on it, so as to avoid the instability of the shearing process caused by improper opening of the return oil channel and improve the shearing accuracy. and equipment life; a temperature analysis module, which is used to calculate the temperature change rate of the hydraulic oil per unit time according to the temperature data in the hydraulic oil data set, and judge whether there is abnormal temperature rise in the hydraulic oil based on it, and obtain a cooling adjustment instruction. Through the temperature change rate analysis, the high temperature problem of the hydraulic system can be discovered in advance to prevent the viscosity from being reduced due to overheating of the hydraulic oil, which affects the smoothness of the hydraulic cylinder movement; a cooling adjustment module, which is used to calculate the target opening time of the cooling circuit according to the cooling adjustment instruction, and maintain the opening time of the cooling circuit to the target opening time based on it. By intelligently adjusting the cooling system, the problem of uneven shearing caused by excessive hydraulic oil temperature can be avoided, thereby improving the shearing quality.

[0069] The data acquisition module is used to collect the pressure data, flow rate data and temperature data of the hydraulic oil during the shearing process to obtain the initial data set, which specifically includes:

[0070] In order to ensure that the key data of the hydraulic system can be fully collected, the data acquisition module adopts a multi-sensor layout, including:

[0071] Pressure sensor: arranged at the hydraulic pump outlet, hydraulic cylinder oil inlet, and the cylinder area near the shear blade to detect the dynamic changes of pressure during the shearing process;

[0072] Flow sensor: installed on the oil return line and hydraulic pump outlet to monitor the flow rate and oil return of hydraulic oil in real time;

[0073] Temperature sensor: installed at the hydraulic pump outlet, cooling system inlet, oil return pipe, etc. to ensure the data integrity of the hydraulic oil temperature during the entire circulation process.

[0074] The acquisition frequency can be adjusted according to the working mode of the hydraulic shear. For example, in high-load shear mode, the sampling frequency is increased to 500Hz per second, while in low-load conditions, it is reduced to 200Hz per second to reduce data redundancy and system burden.

[0075] Use industrial Ethernet for data transmission to increase data transmission rate and ensure real-time performance;

[0076] Set up a data buffer. When the data collected by the sensor reaches a certain amount, it will be transferred to the data processing unit in batches to improve the system data processing efficiency.

[0077] The first-in-first-out queue mechanism is used to store data, ensuring that the latest data is given priority in calculation;

[0078] Timestamp the data to ensure that the data can be correctly matched between different modules;

[0079] Wireless transmission or wired network transmission is adopted to support remote monitoring and diagnosis, and improve the intelligence level of hydraulic shears.

[0080] The data preprocessing module is used to preprocess the initial data set, remove redundant data and unify the unit dimension to obtain the hydraulic oil data set, which specifically includes:

[0081] Noise data, outliers, or incomplete data may appear during data collection, so data cleaning is required:

[0082] Abnormal data detection: Use the three sigma principle or box plot method to detect abnormal points in the data. If the collected pressure value is far beyond the normal range, it is judged as abnormal;

[0083] Data interpolation: For short-term data missing, linear interpolation or sliding window mean is used to fill in the gaps to ensure data continuity;

[0084] Remove sudden noise: Use the median filter algorithm to eliminate noise data caused by sensor jitter or electromagnetic interference.

[0085] Since the data formats and units of different sensors may be different, format conversion is required:

[0086] Unit conversion: All pressure values ​​are converted to MPa, flow rates are converted to L / min, and temperatures are converted to °C;

[0087] Data structure standardization: Convert all data to floating point format and store them with a fixed number of decimal places to ensure that the calculation is not affected by the format.

[0088] In order to reduce data fluctuations and improve the stability of system regulation, the data is smoothed:

[0089] Sliding mean filtering: Use the sliding window mean method to smooth the data, reduce short-term drastic fluctuations, and improve data stability;

[0090] Exponentially weighted moving average: For pressure data and flow rate data, an exponentially weighted method is used to give more recent data a higher weight, ensuring that the system can respond quickly to sudden changes while reducing the impact of small disturbances on the control system.

[0091] The preprocessed data needs to be transferred to the subsequent analysis module in a standardized structure:

[0092] Time series storage: Store data in chronological order and ensure that each data point has an accurate timestamp;

[0093] Data compression: For remote monitoring data transmitted to the cloud, wavelet compression is used to reduce the amount of transmitted data and improve system efficiency.

[0094] In a preferred embodiment of the present invention, the pressure analysis module includes:

[0095] A pressure curve generating unit is used to determine the instantaneous pressure value of the hydraulic oil according to the pressure data at a preset time point, and to construct a pressure change curve of the pressure changing with time based on the pressure data;

[0096] A pressure gradient calculation unit is used to perform differential processing on the pressure change curve and calculate the pressure change gradient at each time point;

[0097] An abnormal pressure identification unit is used to detect whether the pressure change at each time point exceeds a preset pressure threshold according to the pressure change gradient, and generate an abnormal pressure fluctuation signal;

[0098] The load adjustment instruction generating unit is used to calculate the pressure correction amount in the shearing process according to the abnormal pressure fluctuation signal and generate the load adjustment instruction.

[0099] In an embodiment of the present invention, a pressure curve generating unit is used to determine the instantaneous pressure value of the hydraulic oil according to a preset time point based on the pressure data, and to construct a pressure change curve of the pressure change over time based on the pressure data. By generating a complete pressure curve, accurate data support can be provided for subsequent pressure gradient calculation and abnormality detection; a pressure gradient calculating unit is used to perform differential processing on the pressure change curve, calculate the pressure change gradient at each time point, and by calculating the pressure gradient, the pressure change trend can be more accurately reflected; an abnormal pressure identification unit is used to detect whether the pressure change at each time point exceeds a preset pressure threshold according to the pressure change gradient, and generate an abnormal pressure fluctuation signal. By setting the threshold and comparing the gradient, abnormal pressure fluctuations can be accurately identified; a load adjustment instruction generating unit is used to calculate the pressure correction amount in the shearing process according to the abnormal pressure fluctuation signal, and generate a load adjustment instruction. By calculating the pressure correction amount, the system can dynamically adjust the pressure.

[0100] The load adjustment instruction generating unit is used to calculate the pressure correction amount in the shearing process according to the abnormal pressure fluctuation signal and generate the load adjustment instruction, which specifically includes:

[0101] The unit receives abnormal pressure fluctuation signals and analyzes whether the current pressure state deviates from the normal shear range;

[0102] If an abnormal pressure fluctuation is detected, a pressure correction amount is further calculated, and the calculation of the pressure correction amount is based on the amplitude and trend of the abnormal pressure fluctuation;

[0103] Pressure correction Calculation method: ;

[0104] in, is the pressure change gradient at the current time point, It is the adjustment coefficient, which is set according to experimental data and is used to control the amplitude of correction.

[0105] In a preferred embodiment of the present invention, the load regulation module includes:

[0106] A target pressure calculation unit, used for calculating a target pressure value of the hydraulic pump during the shearing process according to a pressure correction amount;

[0107] A pressure adjustment step length determination unit, used to calculate a pressure deviation according to a target pressure value and an actual output pressure value, and calculate a pressure adjustment step length therefrom to generate a pressure adjustment instruction;

[0108] The pressure feedback control unit is used to gradually adjust the output pressure value of the hydraulic pump according to the pressure adjustment instruction so that it approaches the target pressure value, and ensure the pressure stability during shearing by real-time monitoring the pressure changes after adjustment.

[0109] In an embodiment of the present invention, a target pressure calculation unit is used to calculate the target pressure value of the hydraulic pump during the shearing process according to the pressure correction amount, and calculate the most appropriate pressure value to avoid shearing failure caused by insufficient pressure or equipment damage caused by excessive pressure; a pressure adjustment step determination unit is used to calculate the pressure deviation according to the target pressure value and the actual output pressure value, and calculate the pressure adjustment step according to it, and generate a pressure adjustment instruction to ensure that the pressure adjustment process is gradual rather than sudden, so as to avoid hydraulic system shock or shear blade damage caused by a sudden pressure rise; a pressure feedback control unit is used to gradually adjust the output pressure value of the hydraulic pump according to the pressure adjustment instruction so that it approaches the target pressure value, and ensure pressure stability during shearing by real-time monitoring of the adjusted pressure changes, and through real-time pressure feedback control, the output pressure of the hydraulic pump can be accurately controlled within the target range, thereby improving the stability of the shearing process.

[0110] In a preferred embodiment of the present invention, the calculation formula of the pressure adjustment step is: ;

[0111] in, is the pressure adjustment step size, is the target pressure value, is the actual output pressure value, is the pressure deviation, To cut the length of the item, To cut the thickness of the item, is the maximum adjustment step allowed for the hydraulic pump, , is the theoretical adjustment step size, is the minimum function, when When ,when ,but , are coefficients respectively.

[0112] In an embodiment of the present invention, by calculating the theoretical pressure adjustment step, the pressure regulation process is made smoother, and system oscillation caused by excessive one-time adjustment range is avoided, ensuring that the pressure adjustment during the shearing process is more precise, thereby improving the shearing quality of the hydraulic shears; by constraining the maximum adjustment step, the pressure fluctuation problem caused by too fast adjustment of the hydraulic system is avoided, thereby improving the stability of the system; the calculation formula of the pressure adjustment step is combined with the physical properties of the sheared object, making the pressure adjustment process more targeted, ensuring the shearing quality and equipment safety; by adjusting the pressure in steps, the pressure adjustment process is prevented from being too fast and too violent, and the hydraulic system is prevented from being mechanically damaged by pressure shock, so that when the hydraulic shears shear high-strength steel or thick-walled materials, the shear blade can operate within the most suitable pressure range, thereby improving the shearing quality and efficiency.

[0113] In a preferred embodiment of the present invention, the flow rate analysis module comprises:

[0114] The oil return flow rate change calculation unit is used to calculate the change rate of the oil return flow rate in adjacent time periods according to the flow rate data, obtain the instantaneous oil return change rate, and record the distribution of the instantaneous oil return change rate in each time period to form a flow fluctuation sequence;

[0115] The oil return opening extraction unit is used to extract the oil return opening value of the oil return channel in the corresponding time period according to the flow fluctuation sequence, and establish the correlation relationship between the oil return opening value and the instantaneous oil return change rate based on it to obtain the oil return opening flow relationship data set;

[0116] The opening matching analysis unit is used to calculate the actual return oil opening deviation value of the return oil channel in the current time period according to the return oil opening flow relationship data set, and to determine whether the return oil flow fluctuation is caused by the change in the opening value. When the result is yes, an oil return adjustment instruction is generated.

[0117] In the embodiment of the present invention, the return oil flow rate change calculation unit is used to calculate the change rate of the return oil flow rate in adjacent time periods according to the flow rate data, obtain the instantaneous return oil change rate, and record the distribution of the instantaneous return oil change rate in each time period to form a flow fluctuation sequence. By calculating the instantaneous return oil change rate, the fluctuation of the hydraulic oil return flow can be accurately identified to avoid the instability of the system pressure due to the sudden change of the flow rate; the return oil opening extraction unit is used to extract the return oil opening value of the return oil channel in the corresponding time period according to the flow fluctuation sequence, and establish the correlation relationship between the return oil opening value and the instantaneous return oil change rate according to the return oil opening value to obtain the return oil opening flow. The opening value and the flow rate change rate are established by using a data set of quantity relationship, so that the system can predict the fluctuation of the return oil flow through the change of the opening of the return oil channel, thereby improving the controllability of the hydraulic system; the opening matching analysis unit is used to calculate the actual return oil opening deviation value of the return oil channel in the current time period according to the return oil opening flow relationship data set, and to determine whether the return oil flow fluctuation is caused by the change of the opening value. When the result is yes, a return oil adjustment instruction is generated. By calculating the actual return oil opening deviation value, the system can accurately analyze the cause of the change in the return oil flow, thereby avoiding the flow instability problem caused by improper setting of the return oil channel opening.

[0118] In a preferred embodiment of the present invention, the oil return opening extraction unit comprises:

[0119] The opening data acquisition unit is used to synchronously acquire the opening value of the oil return channel in the corresponding time period according to the flow fluctuation sequence to obtain the opening value sequence;

[0120] A data pairing unit is used to pair the change in the opening value of the oil return channel with the change in the instantaneous oil return change rate in adjacent time periods according to the opening value sequence and the flow fluctuation sequence, so as to obtain a data set of oil return opening flow change;

[0121] A relationship fitting unit is used to calculate the correlation between the oil return opening value and the instantaneous oil return change rate according to the oil return opening flow change data set, and select a linear regression model based on it, calculate the parameters of the linear regression model, and obtain a fitting model;

[0122] The association relationship storage unit is used to store the fitting model in the oil return opening flow relationship data set, and dynamically update it during the shearing process to ensure that the oil return opening and the instantaneous oil return change rate match each other.

[0123] In the embodiment of the present invention, the opening data acquisition unit is used to synchronously acquire the return oil channel opening value of the corresponding time period according to the flow fluctuation sequence to obtain the opening value sequence. The synchronous acquisition of the flow fluctuation sequence and the return oil channel opening value ensures the time consistency of the data and improves the data matching accuracy. The data matching unit is used to perform data matching on the change of the return oil channel opening value in the adjacent time period and the change of the instantaneous return oil change rate according to the opening value sequence and the flow fluctuation sequence to obtain the return oil opening flow change data set. The corresponding relationship between the return oil opening value and the instantaneous return oil change rate is established through data matching, so that the system can quantify the influence of the return oil opening on the return oil flow. The relationship fitting unit The element is used to calculate the correlation between the return oil opening value and the instantaneous return oil change rate according to the return oil opening flow change data set, and select the linear regression model based on it, calculate the parameters of the linear regression model, and obtain the fitting model. By establishing a mathematical model, the system can predict the impact of the return oil channel opening adjustment on the return oil flow rate and improve the accuracy of the adjustment; the association relationship storage unit is used to store the fitting model in the return oil opening flow relationship data set, and dynamically update it during the shearing process to ensure that the return oil opening and the instantaneous return oil change rate match each other. By storing and dynamically updating the relationship data set between the return oil opening and the flow, the system can continuously optimize the return oil adjustment strategy and improve the system's adaptability.

[0124] Among them, the relationship fitting unit is used to calculate the correlation between the return oil opening value and the instantaneous return oil change rate according to the return oil opening flow change data set, and select a linear regression model based on it, calculate the parameters of the linear regression model, and obtain a fitting model, which specifically includes:

[0125] By calculating the Pearson correlation coefficient between the oil return opening value and the instantaneous oil return change rate .

[0126] By Pearson correlation coefficient Determine the strength of correlation:

[0127] like >0.8 indicates strong correlation, and linear regression modeling can be used directly;

[0128] If 0.5< ≤0.8 indicates a moderate correlation and linear regression can be attempted, but the variables may need to be transformed;

[0129] like ≤0.5 indicates weak or no correlation, and nonlinear regression methods may need to be considered.

[0130] Select a preliminary model based on the strength of the correlation, perform a preliminary fit test, train the preliminary model using the least squares method, and solve for the model coefficients;

[0131] The model coefficients obtained by the final fitting are stored in the database and associated with the return oil opening flow relationship data set. During the shearing process, the model is updated in real time to ensure that the fitting model can adapt to different working conditions.

[0132] In a preferred embodiment of the present invention, the opening adjustment module includes:

[0133] The target opening calculation unit is used to calculate the target opening value of the oil return channel according to the oil return adjustment instruction, and calculate the influence of the target opening value after adjustment on the flow rate change rate, so as to obtain the predicted instantaneous oil return change rate;

[0134] The opening dynamic adjustment unit is used to adjust the opening value of the oil return channel in steps according to the actual opening value of the oil return channel, so that it gradually approaches the target opening value;

[0135] The opening feedback correction unit is used to calculate the actual instantaneous oil return change rate after adjustment and compare it with the predicted instantaneous oil return change rate. When there is a deviation, the target opening value is corrected and a secondary adjustment is performed to ensure that the opening value of the oil return channel matches the hydraulic oil flow.

[0136] In an embodiment of the present invention, a target opening calculation unit is used to calculate the target opening value of the oil return channel according to the oil return adjustment instruction, and calculate the influence of the adjusted target opening value on the flow rate change rate to obtain the predicted instantaneous oil return change rate. By calculating the target opening value based on the flow data and the oil return opening historical data, the adjustment of the oil return channel is more adaptable and can respond to the changes of different shear loads in real time; the opening dynamic adjustment unit is used to adjust the opening value of the oil return channel in steps according to the actual opening value of the oil return channel, so that it gradually approaches the target opening value, and adopts a progressive adjustment method to make the change of the oil return opening more stable to prevent sudden fluctuations in the hydraulic system; the opening feedback correction unit is used to calculate the adjusted actual instantaneous oil return change rate, and compare it with the predicted instantaneous oil return change rate. When there is a deviation, the target opening value is corrected and a secondary adjustment is performed to ensure that the opening value of the oil return channel matches the hydraulic oil flow. Through feedback adjustment, the control accuracy of the oil return channel is improved to ensure the stability of the hydraulic oil flow during the shearing process.

[0137] The target opening calculation unit is used to calculate the target opening value of the oil return channel according to the oil return adjustment instruction, and calculate the influence of the target opening value on the flow rate change rate after adjustment, so as to obtain the predicted instantaneous oil return change rate, which specifically includes:

[0138] During the shearing process, the system obtains the real-time data of the return oil flow from the flow rate analysis module, and calculates the return oil flow change rate in adjacent time periods to form a return oil flow change sequence;

[0139] According to the oil return flow rate change sequence, the historical oil return opening value under the current shear state is extracted from the oil return opening flow rate relationship data set, and the target oil return opening value of the current time period is calculated based on the linear regression model;

[0140] The calculation formula of the target oil return opening value can be expressed as: ;

[0141] in, is the target oil return opening value at the current time point, is the target oil return opening value at the previous time point, and are the oil return flow rates at the current time point and the previous time point, respectively. is the time interval between the current time point and the previous time point, is the coefficient.

[0142] After calculating the target oil return opening value, the system inputs this value into the flow oil return mathematical model to predict the instantaneous oil return change rate of the hydraulic oil after adjustment;

[0143] The calculation formula for predicting the instantaneous oil return change rate can be expressed as: ;

[0144] in, To predict the instantaneous oil return rate, is the target oil return opening value at the current time point, is the coefficient, is a constant.

[0145] In a preferred embodiment of the present invention, the temperature analysis module includes:

[0146] A temperature change calculation unit is used to calculate the temperature change rate of the hydraulic oil in adjacent time periods according to the temperature data, and to construct a temperature change curve based on the temperature change rate;

[0147] The temperature rise abnormality detection unit is used to determine whether the temperature change rate exceeds a preset temperature rise threshold value according to the temperature change curve, and generate a temperature abnormality signal when the result is yes;

[0148] The cooling correlation analysis unit is used to calculate the temperature influence coefficient of the opening time of the cooling circuit on the hydraulic oil temperature according to the temperature abnormality signal, and obtain the cooling adjustment instruction.

[0149] In the embodiment of the present invention, the temperature change calculation unit is used to calculate the temperature change rate of the hydraulic oil in adjacent time periods according to the temperature data, and to construct a temperature change curve according to the temperature change curve, so that the system can intuitively analyze the temperature change trend and avoid misjudgment due to short-term temperature fluctuations;

[0150] The temperature rise abnormality detection unit is used to determine whether the temperature change rate exceeds the preset temperature rise threshold according to the temperature change curve. If the result is yes, a temperature abnormality signal is generated. By setting the temperature change rate threshold, normal temperature rise and abnormal temperature rise can be distinguished more accurately to avoid invalid cooling operation;

[0151] The cooling correlation analysis unit is used to calculate the temperature influence coefficient of the opening time of the cooling circuit on the hydraulic oil temperature according to the temperature abnormality signal, obtain the cooling adjustment instruction, and improve the energy efficiency of the cooling system and reduce energy waste by dynamically optimizing the cooling strategy.

[0152] In a preferred embodiment of the present invention, the calculation formula of the temperature influence coefficient is: ;

[0153] in, is the temperature influence coefficient, is the initial temperature of the hydraulic oil, is the real-time temperature of the hydraulic oil, is the ambient temperature, is the opening time of the cooling circuit, is the total operating time of the hydraulic pump, is the real-time flow rate of hydraulic oil, is the maximum flow rate allowed by the hydraulic system, is the comprehensive efficiency coefficient of the cooling circuit, is the preset temperature threshold of the hydraulic oil, are coefficients respectively.

[0154] In the embodiment of the present invention, a logarithmic function is used to calculate the temperature drop amplitude, which is used to measure the current temperature drop of the hydraulic oil and is related to the ambient temperature. The logarithmic form ensures that the initial temperature drop has a greater impact and the later impact decreases, which is more in line with the actual situation of the hydraulic cooling process. Combined with the influence of the opening time of the cooling circuit on the temperature, the ratio of the cooling opening time to the total system operation time is normalized to ensure the calculation stability under different working conditions. The nonlinear influence is adjusted so that the increase of cooling time brings about nonlinear effect to avoid overcooling or insufficient cooling; combined with the influence of hydraulic oil flow rate on cooling capacity, since the hydraulic oil flow rate has a nonlinear influence on the heat exchange capacity of the cooling system, an exponential function is used here to adjust it; the influence of the cooling circuit decays exponentially with time, indicating that the cooling effect gradually tends to saturation after being turned on for a long time, which is in line with the thermal conduction characteristics of the actual cooling system.

[0155] in, With units , With units , to ensure the number of items and No units.

[0156] In a preferred embodiment of the present invention, the cooling regulation module comprises:

[0157] A cooling target calculation unit, used to calculate the target opening time of the cooling circuit according to the cooling adjustment instruction, and determine the opening frequency of the cooling circuit according to the target opening time of the cooling circuit in combination with the hydraulic oil temperature change rate;

[0158] The cooling dynamic adjustment unit is used to dynamically adjust the start and stop of the cooling circuit according to the target opening time, opening frequency and temperature influence coefficient to ensure that the hydraulic oil temperature is maintained within the set range;

[0159] The cooling feedback control unit is used to adjust the opening duration and opening frequency of the cooling circuit according to the real-time temperature data of the hydraulic oil. When the actual temperature change rate of the hydraulic oil is still higher than the preset temperature rise threshold, a secondary cooling adjustment instruction is generated to optimize the cooling process.

[0160] In an embodiment of the present invention, a cooling target calculation unit is used to calculate the target opening time of the cooling circuit according to the cooling adjustment instruction, and determine the opening frequency of the cooling circuit according to the target opening time and opening frequency of the cooling circuit. By calculating the target opening time and opening frequency of the cooling circuit, the cooling process is made more accurate, the temperature control accuracy of the hydraulic oil is improved, and the problem of overcooling or insufficient cooling is avoided; a cooling dynamic adjustment unit is used to dynamically adjust the start and stop of the cooling circuit according to the target opening time, opening frequency and temperature influence coefficient to ensure that the hydraulic oil temperature is maintained within a set range. By dynamically adjusting the opening time and frequency of the cooling circuit, the cooling system can adapt to different working conditions and improve the cooling efficiency; a cooling feedback control unit is used to adjust the opening time and opening frequency of the cooling circuit according to the real-time temperature data of the hydraulic oil. When the actual temperature change rate of the hydraulic oil is still higher than the preset temperature rise threshold, a secondary cooling adjustment instruction is generated to optimize the cooling process. The cooling strategy is optimized through real-time data feedback, so that the cooling circuit can restore the hydraulic oil temperature to a reasonable range in the shortest time, thereby improving the equipment operation efficiency.

[0161] The cooling target calculation unit is used to calculate the target opening time of the cooling circuit according to the cooling adjustment instruction, and determine the opening frequency of the cooling circuit according to the target opening time of the cooling circuit in combination with the hydraulic oil temperature change rate, which specifically includes:

[0162] Based on the temperature change rate and the preset temperature threshold of the hydraulic system, the target opening time is calculated: ;

[0163] in, Open the target duration. is the actual temperature of the hydraulic oil, Preset normal temperature for hydraulic oil, is the temperature change rate, and are the coefficients respectively;

[0164] During the operation of the cooling system, the temperature drop rate of the hydraulic oil is continuously monitored. The calculation formula is: ;

[0165] in, is the actual temperature of the hydraulic oil, is the temperature of the hydraulic oil at a certain point in time after cooling. is the time difference;

[0166] Cooling system activation frequency The calculation formula is: ;

[0167] in, is the temperature drop rate, is the temperature change rate, that is, the temperature rise rate before cooling, is the coefficient.

[0168] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A hydraulic system for a mobile hydraulic shear, characterized in that: The system comprises: A data acquisition module is used to collect pressure data, flow rate data and temperature data of the hydraulic oil during the shearing process to obtain an initial data set; A data preprocessing module is used to preprocess the initial data set, remove redundant data and unify the unit dimension to obtain a hydraulic oil data set; The pressure analysis module is used to draw a pressure change curve of the hydraulic oil pressure changing with time during the shearing process according to the pressure data in the hydraulic oil data set, and calculate the pressure change gradient based on it to analyze whether abnormal pressure fluctuation occurs in the current shearing, and obtain the load adjustment instruction; A load adjustment module, used to calculate the target pressure value of the hydraulic oil during the shearing process according to the load adjustment instruction, and adjust the output pressure value of the hydraulic pump to the target pressure value according to the load adjustment instruction; The flow rate analysis module is used to calculate the change rate of the return oil flow in adjacent time periods according to the flow rate data in the hydraulic oil data set, obtain the instantaneous return oil change rate, and extract the return oil opening value of the return oil channel based on it, analyze whether the return oil flow fluctuation is caused by the change of the opening value of the return oil channel, and obtain the return oil adjustment instruction; The opening adjustment module is used to calculate the target opening value of the oil return channel according to the oil return adjustment instruction, and adjust the opening value of the oil return channel to the target opening value according to the target opening value; The temperature analysis module is used to calculate the temperature change rate of the hydraulic oil per unit time according to the temperature data in the hydraulic oil data set, and to determine whether there is an abnormal temperature rise phenomenon of the hydraulic oil based on the temperature data, and obtain a cooling adjustment instruction; A cooling adjustment module, used for calculating a target opening time of the cooling circuit according to the cooling adjustment instruction, and maintaining the opening time of the cooling circuit to the target opening time according to the cooling adjustment instruction; The load regulation module comprises: A target pressure calculation unit, used for calculating a target pressure value of the hydraulic pump during the shearing process according to a pressure correction amount; A pressure adjustment step length determination unit, used to calculate a pressure deviation according to a target pressure value and an actual output pressure value, and calculate a pressure adjustment step length therefrom to generate a pressure adjustment instruction; The pressure feedback control unit is used to gradually adjust the output pressure value of the hydraulic pump according to the pressure adjustment instruction so that it approaches the target pressure value, and ensure the pressure stability during shearing by real-time monitoring the pressure change after adjustment; The calculation formula of the pressure adjustment step is: ， in, is the pressure adjustment step size, is the target pressure value, is the actual output pressure value, is the pressure deviation, To cut the length of the item, To cut the thickness of the item, is the maximum adjustment step allowed for the hydraulic pump, , is the theoretical adjustment step size, is the minimum function, when When ,when ,but , are coefficients respectively.

2. The hydraulic system of a mobile hydraulic shear according to claim 1, characterized in that: The pressure analysis module includes: A pressure curve generating unit is used to determine the instantaneous pressure value of the hydraulic oil according to the pressure data at a preset time point, and to construct a pressure change curve of the pressure changing with time based on the pressure data; A pressure gradient calculation unit is used to perform differential processing on the pressure change curve and calculate the pressure change gradient at each time point; An abnormal pressure identification unit is used to detect whether the pressure change at each time point exceeds a preset pressure threshold according to the pressure change gradient, and generate an abnormal pressure fluctuation signal; The load adjustment instruction generating unit is used to calculate the pressure correction amount in the shearing process according to the abnormal pressure fluctuation signal and generate the load adjustment instruction.

3. The hydraulic system of a mobile hydraulic shear according to claim 2, characterized in that: The flow rate analysis module comprises: The oil return flow rate change calculation unit is used to calculate the change rate of the oil return flow rate in adjacent time periods according to the flow rate data, obtain the instantaneous oil return change rate, and record the distribution of the instantaneous oil return change rate in each time period to form a flow fluctuation sequence; The oil return opening extraction unit is used to extract the oil return opening value of the oil return channel in the corresponding time period according to the flow fluctuation sequence, and establish the correlation relationship between the oil return opening value and the instantaneous oil return change rate based on it to obtain the oil return opening flow relationship data set; The opening matching analysis unit is used to calculate the actual return oil opening deviation value of the return oil channel in the current time period according to the return oil opening flow relationship data set, and to determine whether the return oil flow fluctuation is caused by the change in the opening value. When the result is yes, an oil return adjustment instruction is generated.

4. The hydraulic system of a mobile hydraulic shear according to claim 3, characterized in that: The oil return opening extraction unit comprises: The opening data acquisition unit is used to synchronously acquire the opening value of the oil return channel in the corresponding time period according to the flow fluctuation sequence to obtain the opening value sequence; A data pairing unit is used to pair the change in the opening value of the oil return channel with the change in the instantaneous oil return change rate in adjacent time periods according to the opening value sequence and the flow fluctuation sequence, so as to obtain a data set of oil return opening flow change; A relationship fitting unit is used to calculate the correlation between the oil return opening value and the instantaneous oil return change rate according to the oil return opening flow change data set, and select a linear regression model based on it, calculate the parameters of the linear regression model, and obtain a fitting model; The associative relationship storage unit is used to store the fitting model in the oil return opening flow relationship data set, and dynamically update it during the shearing process to ensure that the oil return opening and the instantaneous oil return change rate match each other.

5. The hydraulic system of a mobile hydraulic shear according to claim 4, characterized in that: The opening adjustment module comprises: The target opening calculation unit is used to calculate the target opening value of the oil return channel according to the oil return adjustment instruction, and calculate the influence of the target opening value after adjustment on the flow rate change rate, so as to obtain the predicted instantaneous oil return change rate; The opening dynamic adjustment unit is used to adjust the opening value of the oil return channel in steps according to the actual opening value of the oil return channel, so that it gradually approaches the target opening value; The opening feedback correction unit is used to calculate the actual instantaneous oil return change rate after adjustment and compare it with the predicted instantaneous oil return change rate. When there is a deviation, the target opening value is corrected and a secondary adjustment is performed to ensure that the opening value of the oil return channel matches the hydraulic oil flow.

6. The hydraulic system of a mobile hydraulic shear according to claim 5, characterized in that: The temperature analysis module comprises: A temperature change calculation unit is used to calculate the temperature change rate of the hydraulic oil in adjacent time periods according to the temperature data, and to construct a temperature change curve based on the temperature change rate; The temperature rise abnormality detection unit is used to determine whether the temperature change rate exceeds a preset temperature rise threshold value according to the temperature change curve, and generate a temperature abnormality signal when the result is yes; The cooling correlation analysis unit is used to calculate the temperature influence coefficient of the opening time of the cooling circuit on the hydraulic oil temperature according to the temperature abnormality signal, and obtain the cooling adjustment instruction.

7. The hydraulic system of a mobile hydraulic shear according to claim 6, characterized in that: The calculation formula of the temperature influence coefficient is: ， in, is the temperature influence coefficient, is the initial temperature of the hydraulic oil, is the real-time temperature of the hydraulic oil, is the ambient temperature, is the opening time of the cooling circuit, is the total operating time of the hydraulic pump, is the real-time flow rate of hydraulic oil, is the maximum flow rate allowed by the hydraulic system, is the comprehensive efficiency coefficient of the cooling circuit, is the preset temperature threshold of the hydraulic oil, are coefficients respectively.

8. The hydraulic system of a mobile hydraulic shear according to claim 7, characterized in that: The cooling and regulating module comprises: A cooling target calculation unit, used to calculate the target opening time of the cooling circuit according to the cooling adjustment instruction, and determine the opening frequency of the cooling circuit according to the target opening time of the cooling circuit in combination with the hydraulic oil temperature change rate; The cooling dynamic adjustment unit is used to dynamically adjust the start and stop of the cooling circuit according to the target opening time, opening frequency and temperature influence coefficient to ensure that the hydraulic oil temperature is maintained within the set range; The cooling feedback control unit is used to adjust the opening duration and opening frequency of the cooling circuit according to the real-time temperature data of the hydraulic oil. When the actual temperature change rate of the hydraulic oil is still higher than the preset temperature rise threshold, a secondary cooling adjustment instruction is generated to optimize the cooling process.

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