CN-122014719-A - Hydraulic control method of hydraulic power station

Abstract

The invention relates to the technical field of hydraulic control, in particular to a hydraulic control method of a hydraulic power station, which comprises the steps of judging whether the hydraulic power station is in a long-time low-load running state according to a production task instruction stream; the method comprises the steps of switching an operation mode of a hydraulic power station into a pulse oil supply and pressure inertia maintaining mode if the hydraulic power station is in a long-time low-load operation state, continuously monitoring actual working pressure requirements of a key hydraulic actuating mechanism sensitive to pressure in the pulse oil supply and pressure inertia maintaining mode, adjusting a main pipeline pressure fluctuation range, driving a variable pump to operate with high-efficiency displacement when the main pipeline pressure is reduced to the lower limit of the fluctuation range, enabling the main pipeline pressure to rise to the upper limit of the pressure fluctuation range, stopping oil supply of the variable pump or enabling the variable pump to enter a zero-displacement standby state, and switching and optimizing an oil supply strategy through an intelligent mode, so that energy consumption and heat generation of the hydraulic power station are reduced, and service lives of hydraulic oil and elements are prolonged.

Inventors

• ZHANG BO

Assignees

• 德坤液压科技(南通)有限公司

Dates

Publication Date

20260512

Application Date

20251010

Claims (4)

1. 1. A hydraulic control method of a hydraulic power station, the method comprising the steps of: judging whether the hydraulic power station is in a long-time low-load running state according to the production task instruction stream; if the hydraulic power station is in a long-time low-load operation state, switching the operation mode of the hydraulic power station into a pulse oil supply and pressure inertia maintaining mode; Continuously monitoring actual working pressure requirements of a key hydraulic actuator sensitive to pressure in the pulse oil supply and pressure inertia maintaining mode, and adjusting the pressure fluctuation range of a main pipeline according to the actual working pressure requirements; When the main pipeline pressure is reduced to the lower limit of the fluctuation range, driving the variable pump to operate at high-efficiency displacement, so that the main pipeline pressure is increased to the upper limit of the pressure fluctuation range, and stopping oil supply of the variable pump or enabling the variable pump to enter a zero-displacement standby state; Continuously monitoring action instructions of a high-priority hydraulic executing mechanism in a pulse oil supply and pressure inertia maintaining mode, immediately interrupting the pulse oil supply and pressure inertia maintaining mode when the high-priority action instructions are detected, and driving the variable pump to operate at maximum displacement; The step of continuously monitoring actual working pressure requirements of the key hydraulic actuator sensitive to pressure in the pulse oil supply and pressure inertia maintaining mode and adjusting the pressure fluctuation range of the main pipeline according to the actual working pressure requirements comprises the following steps: Continuously monitoring actual working pressure requirements of a pressure-sensitive key hydraulic actuator in the pulse oil supply and pressure inertia maintaining mode; Monitoring the time required for the main pipeline pressure to drop from the initial pressure to the final pressure after the variable pump stops oil supply; comparing the required time with a preset reference time, and determining the change of the pressure decay rate of the main pipeline; Evaluating an internal leakage trend of the key hydraulic actuator based on the change in the pressure decay rate; According to the actual working pressure requirement and the internal leakage trend, adjusting the lower limit of the pressure fluctuation range of the main pipeline to compensate the effective output force loss of the key hydraulic actuating mechanism; before the step of monitoring the time required for the main line pressure to drop from the starting pressure to the ending pressure, the method comprises the steps of: Identifying currently active key hydraulic actuators and isolating hydraulic circuits of non-key hydraulic actuators during time monitoring; the step of evaluating the internal leakage trend of the key hydraulic actuator based on the change in the pressure decay rate comprises: According to the comparison result of the monitored time and the preset reference time and the pressure decay rate change generated by the currently active key hydraulic actuator in the isolation state, evaluating and identifying the internal leakage trend of the currently active key hydraulic actuator; the step of isolating the hydraulic circuit of the other non-critical hydraulic actuators during the time monitoring includes: During the time monitoring, identifying that there is a non-critical hydraulic actuator sharing an oil supply or return path with a currently active critical hydraulic actuator; cooperatively controlling an oil supply branch valve of the non-critical hydraulic actuating mechanism and/or an isolation valve on a public oil return path to block the connection between the non-critical hydraulic actuating mechanism and a main pipeline so as to isolate a hydraulic circuit of the non-critical hydraulic actuating mechanism; Monitoring the residual pressure or flow of the non-critical hydraulic actuator circuit after the blocking operation is completed; When the residual pressure or flow exceeds a preset threshold, performing auxiliary pressure relief or secondary isolation operation to eliminate the interference of the residual pressure or flow on the pressure decay rate of the main pipeline; the step of identifying the currently active key hydraulic actuators includes: acquiring production task instruction information and state feedback information of each key hydraulic actuating mechanism; According to the production task instruction information and the state feedback information of each key hydraulic executing mechanism, identifying the hydraulic executing mechanism in the current working state as an active hydraulic executing mechanism; the step of performing the auxiliary pressure relief or secondary isolation operation includes: continuously monitoring the residual pressure or flow of the non-critical hydraulic actuator circuit; Adjusting the intensity or duration of the auxiliary pressure relief or secondary isolation operation according to the monitored residual pressure or flow; And continuously executing the regulated auxiliary pressure relief or secondary isolation operation until the residual pressure or flow of the non-critical hydraulic actuator loop is reduced below a preset threshold.
2. 2. The hydraulic control method of a hydraulic power station according to claim 1, wherein the setting process of the preset threshold value includes: acquiring current operation parameters of a hydraulic power station; According to the current operation parameters, preliminarily determining the preset threshold value; Under a preset calibration working condition, monitoring the residual pressure or flow attenuation process of the non-critical hydraulic actuator loop; Updating the reference attenuation characteristic of the non-critical hydraulic actuator loop according to the monitoring result of the residual pressure or flow attenuation process; And compensating and adjusting the preliminarily determined preset threshold according to the reference attenuation characteristic.
3. 3. The hydraulic control method of a hydraulic power station according to claim 2, wherein the step of updating the reference damping characteristic of the non-critical hydraulic actuator circuit includes: Acquiring a monitoring result of the residual pressure or flow attenuation process; based on a preset attenuation model, carrying out data processing on the monitoring result; determining parameters of the attenuation model according to the data processing result; and taking the determined model parameters as reference attenuation characteristics of the non-critical hydraulic actuator loop.
4. 4. A hydraulic control method of a hydraulic power station according to claim 3, wherein the construction process of the preset damping model includes: Determining a compression characteristic of the damping model based on hydraulic oil; Determining a damping characteristic of the damping model based on the hydraulic circuit; and determining the attenuation model to be in an exponential attenuation form so as to construct the attenuation model by combining the compression characteristic and the damping characteristic.

Description

Hydraulic control method of hydraulic power station The application relates to a hydraulic control method and a hydraulic control system of a hydraulic power station, which are filed 10 months 10 days 2025 and have the application number 202511443174X. Technical Field The invention relates to the technical field of hydraulic control, in particular to a hydraulic control method of a hydraulic power station. Background In industrial production, a hydraulic power station is used as a core driving unit, a motor drives a hydraulic pump to pressurize hydraulic oil, hydraulic energy is provided for actuators such as press-fitting equipment, clamping and positioning devices, mechanical arms and the like, and different actuators have different demands on system pressure and flow. The variable plunger pump driven by the variable frequency motor is mainly used as a core component, and the control system adjusts the oil discharge amount of the pump through an oil supply-on-demand strategy so as to maintain the pressure stability of a main pipeline, so that the energy utilization efficiency can be improved theoretically. However, in actual production, the hydraulic power station is always in a long-time low-load running state along with the change of production tasks, so that the variable displacement plunger pump works with extremely low oil discharge. At this time, the proportion of the leakage quantity inside the pump occupying the effective output flow is increased sharply, and the fluid friction, throttling effect and mechanical friction loss exacerbate the heat generation, so that the overall efficiency of the pump is greatly reduced, and a large amount of input electric energy is converted into useless heat energy. Such long-term low-efficiency operation causes a gradual cumulative rise in the hydraulic oil temperature, and the oil cooler of the hydraulic power station is generally designed based on the heat generation amount under an average or higher load, failing to sufficiently consider the special heat pattern generated by the pump in a long-term low-discharge, high-internal-leakage state. The cooling system is not able to effectively dissipate this additional, continuously generated heat, resulting in a continuous rise in hydraulic oil temperature beyond the recommended operating temperature range. The temperature of hydraulic oil is raised to trigger a series of chain reactions, such as further increase of the internal leakage quantity of the element due to the decrease of the viscosity of the oil, so as to form vicious circle, meanwhile, the lubrication performance is poor, the abrasion of the element is accelerated, the aging of the sealing element is accelerated at high temperature to trigger leakage, the precision of the precision control element is reduced, the rigidity and the response speed of the system are reduced, the oxidation and deterioration of the oil are accelerated, and the fault risk is increased. The existing hydraulic control method can adjust the oil discharge amount of the pump according to pressure feedback, but mainly focuses on instantaneous pressure stabilization and energy conservation, and fails to fully consider the problem of heat accumulation caused by the nonlinear characteristic of the self-efficiency curve of the pump under long-time low-load operation. The control system lacks real-time sensing and predicting capabilities of the system thermal state, and also lacks a mechanism to actively adjust pump operating strategies or take other thermal management actions when the oil temperature abnormally increases. It only passively maintains pressure without actively managing the thermal balance of the system, resulting in the above-described series of performance degradation and failure risk. In view of the above, there is a need in the art for improvements. Disclosure of Invention The invention aims to solve the defects in the prior art and provides a hydraulic control method of a hydraulic power station. In a first aspect, the present invention provides a hydraulic control method of a hydraulic power station, the method comprising the steps of: judging whether the hydraulic power station is in a long-time low-load running state according to the production task instruction stream; if the hydraulic power station is in a long-time low-load operation state, switching the operation mode of the hydraulic power station into a pulse oil supply and pressure inertia maintaining mode; Continuously monitoring actual working pressure requirements of a key hydraulic actuator sensitive to pressure in the pulse oil supply and pressure inertia maintaining mode, and adjusting the pressure fluctuation range of a main pipeline according to the actual working pressure requirements; When the main pipeline pressure is reduced to the lower limit of the fluctuation range, driving the variable pump to operate at high-efficiency displacement, so that the main pipeline pressure is increased to the upper