Energy-saving assembling and debugging method for hydraulic element

Abstract

The application discloses a kind of hydraulic element energy-saving assembly debugging methods, belong to hydraulic element technical field, comprising the following steps: S1, construct by energy recovery type loading unit, auxiliary power unit, digital controller and the closed-loop debugging system of component interface to be debugged consisting of;S2, system initialization and energy self-check are executed, and the digital controller controls the oil makeup pump in the auxiliary power unit to charge energy buffer device to preset standby pressure;S3, to be debugged component is connected to the interface, and the auxiliary power unit drives the no-load running-in of to-be-debugged component;The application is with energy recovery and buffering technology, a set of debugging system can cover from several hundred watts to several hundred kilowatts different power grade component debugging, without separately configuring high-power oil source for each specification, greatly reduce equipment investment and maintenance cost, realize the flexibility of debugging equipment;At the same time, realize one-key automatic debugging of whole process by digital controller.

Description

Technical Field

[0001] This invention relates to the field of hydraulic component technology, and more specifically, to an energy-saving assembly and debugging method for hydraulic components. Background Technology

[0002] In the assembly and production process of hydraulic components (such as hydraulic pumps, hydraulic valves, and hydraulic cylinders), performance testing before leaving the factory is a crucial step in verifying whether the component's pressure, flow rate, response characteristics, and leakage meet the standards. Current technologies generally employ "open" or "throttling" hydraulic testing circuits: a high-power motor drives a constant-pressure or constant-flow oil source (such as a fixed-displacement pump or a variable-displacement pump) to supply oil to the component under testing. The required load pressure is simulated for the component by adjusting the relief valve or throttling valve. After flowing through the component under testing, the oil returns directly to the oil tank via the relief valve or throttling valve, with almost all of its pressure energy converted into heat energy. This traditional method has a series of inherent defects: First, energy waste is extremely serious. During testing, the oil source pump often operates at full power or high pressure, while the actual power required by the component under testing is often far less than the output power of the oil source. The excess power is lost as heat. Statistics show that in traditional testing benches, only... 20%-40% of the input energy is used for actual loading; secondly, the oil temperature rises rapidly and significantly, leading to a decrease in hydraulic oil viscosity, affecting the accuracy of tests for leakage, pressure loss, and response time. To maintain stable oil temperature, a high-power cooling system must be equipped, further increasing energy consumption; thirdly, loading methods based on relief valves or throttle valves have limited control precision and lag in dynamic response, making it difficult to accurately simulate complex working conditions such as variable pressure, variable flow, and impact loads, and failing to meet the high-precision debugging requirements of high-end proportional servo valves or variable pumps; in addition, for components to be debugged with different power levels, companies often need to configure multiple sets of oil source equipment with different power, resulting in redundant equipment in the debugging workshop and high investment and maintenance costs; finally, the entire debugging process relies heavily on manual experience to adjust the relief valve, which is cumbersome, inefficient, and makes it difficult to achieve digital traceability of debugging data and process optimization.

[0003] Therefore, we have made improvements and proposed an energy-saving assembly and debugging method for hydraulic components. Summary of the Invention

[0004] In view of the above-mentioned problems in the existing technology, the purpose of this invention is to provide an energy-saving assembly and debugging method for hydraulic components.

[0005] To solve the above problems, the technical solution adopted by the present invention is as follows: including the following steps: S1. Construct a closed-loop debugging system consisting of an energy recovery loading unit, an auxiliary power unit, a digital controller, and interfaces for the components to be debugged; S2. Perform system initialization and energy self-check, and the digital controller controls the oil replenishment pump in the auxiliary power unit to charge the energy buffer device to the preset standby pressure; S3. Connect the component to be debugged to the interface, and drive the component to be debugged by the auxiliary power unit to perform no-load break-in; S4. Entering the stepped load debugging stage, the digital controller sends the target load command to the energy recovery loading unit according to the preset debugging curve. The servo driver in the energy recovery loading unit controls its hydraulic pump to run in motor mode, converting the high-pressure hydraulic energy output by the component to be debugged into mechanical energy and driving the servo motor to generate electricity. The generated electrical energy is rectified and filtered and then fed back to the drive motor of the auxiliary power unit through the DC bus or stored in the energy buffer device. At the same time, the closed-loop precise control of the outlet load pressure of the component to be debugged is achieved by adjusting the back electromotive force torque of the generator; dynamic performance debugging is performed to simulate impact load, alternating load and pulse load. S5. After debugging, perform the unloading and residual energy recovery steps to convert the residual pressure energy in the system back into electrical energy storage through the energy recovery loading unit, and disassemble the debugged components.

[0006] Preferably, the energy recovery loading unit includes: a reversible hydraulic pump, the inlet of which is connected to the outlet of the component to be debugged via a first high-pressure pipeline; a servo motor, the output shaft of which is rigidly connected to the rotating shaft of the hydraulic pump via a coupling; a servo driver, the power end of which is connected to the stator winding of the servo motor via a three-phase cable, and the control end of which is connected to the digital controller via a fieldbus; a rectification and feedback unit connected between the DC bus of the servo driver and the power grid; and a DC bus capacitor bank connected in parallel to the DC bus. As a momentary energy buffer; a hydraulic switching valve assembly is located between the oil outlet of the hydraulic pump and the oil tank; the auxiliary power unit includes: a main drive motor with a power of 30%-50% of the rated power of the component to be tested; a fixed or variable hydraulic pump driven by the main drive motor; a replenishing pump, driven independently by a small-power auxiliary motor or connected to the main drive motor via a clutch; a low-pressure suction filter; a high-pressure fine filter; and an overflow safety valve with a set pressure of 1.1-1.2 times the maximum working pressure of the system.

[0007] Preferably, the system initialization and energy self-test steps specifically include: the digital controller performs a self-test on all sensors after power-on; the oil pump operates at 20%-30% of its rated speed, while simultaneously opening the electromagnetic shut-off valve to charge the energy buffer device; when the pressure reaches the preset standby pressure... And the voltage reaches It enters standby mode when the time is up; if the time is not reached, an alarm is triggered; the no-load break-in step specifically includes: the energy recovery loading unit is set to "zero torque" mode; the component to be tested operates at 20%-30% of its rated speed for 30-60 seconds.

[0008] Preferably, the dynamic performance debugging includes: impact load simulation, outputting a step command with a rise time of <20 ms at 120% of the rated pressure, rising to the target within 50 ms, maintaining it for 100 ms, and then recovering, repeating 3-5 times; sinusoidal alternating load simulation, outputting a sine command with an amplitude of ±30% and a frequency sweep of 0.1 Hz-20 Hz; and square wave load simulation, outputting a square wave command with a period of 22 seconds and a duty cycle of 50%.

[0009] Preferably, it also includes accurate measurement of leakage: an oval gear flow meter or mass flow meter with an accuracy within ±0.5% connected in series at the oil drain port of the component to be tested; the average flow rate is read for 5 consecutive seconds at each steady-state pressure point, and if it exceeds the preset threshold, it is judged as unqualified.

[0010] Preferably, it also includes multi-level safety protection: the first safety threshold, automatic pressure relief when the accumulator pressure is >1.15 times the maximum working pressure; the second safety threshold, blocking PWM and energy consumption braking when the DC bus voltage is >1.2 times the rated voltage; the third safety threshold, emergency shutdown, power supply cut-off, and unloading within 1 second when the outlet pressure of the component to be tested is >1.3 times the rated pressure or the oil temperature is >65℃; all safety events trigger audible and visual alarms and store 10 seconds of data before and after the fault.

[0011] Preferably, the unloading and residual energy recovery steps specifically include: gradually reducing the load to zero in 10% increments of the rated pressure; during the load reduction process, the energy recovery unit continuously generates electricity in motor mode until the system pressure is lower than the outlet pressure of the replenishing pump; switching the valve group to short-circuit the pump / motor inlet and outlet ports and pumping oil at low speed to clean the pipeline; and consuming the remaining electrical energy to a safe voltage or reserving it for later use through bidirectional DC / DC converter.

[0012] Preferably, it also includes automatic identification of the component to be debugged: an RFID or QR code scanner is installed at the interface to automatically read the model and parameters, and the digital controller retrieves the corresponding debugging template; if no template is available, it enters the manual configuration wizard; it also includes an energy management module: calculating the energy efficiency ratio in real time. ; in, For system energy efficiency ratio, To recover power, To release power to the buffer device, The buffer device absorbs power. Input power to the grid and display it when... When the value is less than 0.5, a check is prompted; it also includes cloud synchronization and remote diagnostics: a built-in IoT communication module generates an OPC UA or MQTT message after each debugging and uploads it to a remote server; in case of a fault, a fault code is sent to the maintenance terminal and remote VPN diagnostics are supported; it also includes vibration and noise diagnostics: a triaxial accelerometer and a sound pressure level sensor are installed on the housing, a 5-second signal is collected at each steady-state point and the characteristic frequency is extracted by FFT and compared with a healthy sample, and abnormalities are indicated by bearing wear, distribution plate abnormality or cavitation.

[0013] Preferably, the digital controller further includes a self-learning optimization module: recording the pressure response, current curve and recycling efficiency of each debugging session; after the same type of component has been debugged more than 10 times, the least squares method or neural network algorithm is used to automatically tune the PID parameters, load step hold time and charge / discharge threshold, so that the subsequent debugging time is shortened by more than 15% on average and the recycling efficiency is improved by more than 5%.

[0014] Preferably, the interface of the component to be debugged adopts a quick-change zero-leakage hydraulic joint with an integrated self-sealing check valve; before connection, the controller ensures that the interface pipeline is depressurized to zero, and after connection, a proximity switch confirms that it is locked in place, otherwise starting is prohibited; the main drive motor of the auxiliary power unit is a permanent magnet synchronous servo motor with a rated speed of 2000-4000 rpm, equipped with an incremental encoder and a temperature sensor, and the controller adjusts its speed through a vector algorithm; the hydraulic pump in the energy recovery loading unit is a variable axial piston, and the displacement is steplessly adjusted by a proportional electromagnet or stepper motor; at low flow rates, the displacement is automatically reduced to improve power generation efficiency, and at high flow rates, the displacement is increased to avoid overspeed.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The energy recovery loading unit converts the high-pressure hydraulic energy at the outlet of the component to be debugged into electrical energy and feeds it back directly to the auxiliary power unit or stores it in the energy buffer device. It adopts a combination of servo motor and hydraulic pump with digital PID closed-loop control algorithm to achieve precise digital adjustment of load pressure. Its control accuracy can reach 0.5%FS and the dynamic response time is less than 50ms, thereby meeting the debugging requirements of high-performance components such as proportional servo valves and variable pumps for complex variable pressure, impact load and frequency sweep conditions.

[0016] 2. Utilizing energy recovery and buffering technologies, a single commissioning system can cover component commissioning at power levels ranging from several hundred watts to several hundred kilowatts, eliminating the need for separate high-power oil sources for each specification. This significantly reduces equipment investment and maintenance costs, achieving greater flexibility in commissioning equipment. Simultaneously, through a digital controller, the entire process can be automated with a single click, automatically identifying component models, monitoring energy efficiency in real time, and performing self-learning optimization. This transforms the commissioning process from relying on manual experience to digital and intelligent operation, improving commissioning efficiency and forming a traceable quality management closed loop. The system incorporates a three-level safety protection and residual energy discharge mechanism to ensure the safety of personnel and equipment under abnormal operating conditions. Attached Figure Description

[0017] Figure 1 A flowchart of an energy-saving assembly and debugging method for hydraulic components provided in this application. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0019] An energy-saving assembly and debugging method for hydraulic components includes the following steps: S1. Construct a closed-loop debugging system consisting of an energy recovery loading unit, an auxiliary power unit, a digital controller, and interfaces for the components to be debugged; S2. Perform system initialization and energy self-check. The digital controller controls the oil replenishment pump in the auxiliary power unit to charge the energy buffer device to the preset standby pressure. S3. Connect the component to be tested to the interface, and drive the component to be tested by the auxiliary power unit to perform no-load break-in; S4. Entering the stepped load commissioning stage, the digital controller sends the target load command to the energy recovery loading unit according to the preset commissioning curve. The servo driver in the energy recovery loading unit controls its hydraulic pump to run in motor mode, converting the high-pressure hydraulic energy output by the component to be commissioned into mechanical energy and driving the servo motor to generate electricity. The generated electrical energy is rectified and filtered and then fed back to the drive motor of the auxiliary power unit through the DC bus or stored in the energy buffer device. At the same time, the closed-loop precise control of the outlet load pressure of the component to be commissioned is achieved by adjusting the back electromotive force torque of the generator; dynamic performance commissioning is carried out to simulate impact load, alternating load and pulse load. S5. After commissioning, perform the unloading and residual energy recovery steps to convert the residual pressure energy in the system back into electrical energy storage through the energy recovery loading unit, and disassemble the commissioned components.

[0020] Furthermore, the energy recovery loading unit includes: a reversible hydraulic pump, whose inlet is connected to the outlet of the component under test via a first high-pressure pipeline; a servo motor, whose output shaft is rigidly connected to the rotating shaft of the hydraulic pump via a coupling; a servo drive, whose power end is connected to the stator winding of the servo motor via a three-phase cable, and whose control end is connected to the digital controller via a fieldbus; a rectification and feedback unit, connected between the DC bus of the servo drive and the power grid; a DC bus capacitor bank, connected in parallel to the DC bus as an instantaneous energy buffer; a hydraulic switching valve group, located between the outlet of the hydraulic pump and the oil tank; and an auxiliary power unit including: a main drive motor with a power of 30%-50% of the rated power of the component under test; a fixed or variable displacement motor; and a servo motor. The system includes: a hydraulic pump driven by the main drive motor; a replenishing pump driven independently by a small auxiliary motor or connected to the main drive motor via a clutch; a low-pressure suction filter; a high-pressure fine filter; an overflow safety valve with a set pressure of 1.1-1.2 times the maximum working pressure of the system; and an energy buffer device including: a hydraulic accumulator connected in parallel to the oil supply line via a hydraulic line with a pilot-operated solenoid shut-off valve; a supercapacitor module connected to the DC bus via a bidirectional DC / DC converter; a power lithium battery pack also connected to the DC bus via a bidirectional DC / DC converter; and a digital controller that automatically controls the operating mode of the bidirectional DC / DC converter based on the DC bus voltage, charging when the bus voltage is higher than a first threshold and discharging when it is lower than a second threshold.

[0021] Furthermore, the system initialization and energy self-test steps specifically include: after the digital controller is powered on, it self-tests all sensors; the oil pump operates at 20%-30% of its rated speed, while simultaneously opening the solenoid shut-off valve to charge the energy buffer device; when the pressure reaches the preset standby pressure... And the voltage reaches It enters standby mode upon arrival; if the timeout is not reached, an alarm is triggered; the no-load break-in process specifically includes: setting the energy recovery loading unit to "zero torque" mode; the component to be tested operates at 20%-30% of its rated speed for 30-60 seconds; monitoring by vibration and temperature sensors, if the vibration exceeds the threshold or the temperature rise rate is >5℃ / min, it will automatically stop; the preset curve for stepped load debugging is: starting from 10% of the rated pressure, increasing by 10% each time and holding for 10-30 seconds, until 110% overload, then decreasing in the same step; pressure, flow rate, speed / torque, and bus electrical parameters are collected at each steady-state point; closed-loop precise control uses a PID algorithm: input pressure deviation ,in For time, For the target load pressure, Output torque and current command based on actual load pressure. And it automatically switches according to the pressure level, among which For proportional gain, For integral gain, For differential gain, For the proportion term, To accumulate and integrate historical deviations, To generate predictive corrections based on the rate (slope) of change of the deviation; when the bus voltage It automatically reduces power and activates feedback.

[0022] Furthermore, dynamic performance tuning includes: impact load simulation, outputting 120% of rated pressure with a step command with a rise time of <20 ms, rising to the target within 50 ms, maintaining for 100 ms and then recovering, repeating 3-5 times; sinusoidal alternating load simulation, outputting a sinusoidal command with an amplitude of ±30% and a frequency sweep of 0.1 Hz-20 Hz; and square wave load simulation, outputting a square wave command with a period of 22 seconds and a duty cycle of 50%.

[0023] Furthermore, it also includes precise measurement of leakage: an oval gear flow meter or mass flow meter with an accuracy within ±0.5% is connected in series at the oil drain port of the component to be tested; the average flow rate is read for 5 consecutive seconds at each steady-state pressure point, and if it exceeds the preset threshold, it is deemed unqualified.

[0024] Furthermore, it includes multi-level safety protection: the first safety threshold is automatic pressure relief when the accumulator pressure is >1.15 times the maximum working pressure; the second safety threshold is blocking PWM and energy consumption braking when the DC bus voltage is >1.2 times the rated voltage; the third safety threshold is emergency shutdown, power supply cut-off, and unloading within 1 second when the outlet pressure of the component to be tested is >1.3 times the rated pressure or the oil temperature is >65℃; all safety events trigger audible and visual alarms and store 10 seconds of data before and after the fault.

[0025] Furthermore, the unloading and residual energy recovery steps specifically include: gradually reducing the load to zero in 10% increments of rated pressure; during the unloading process, the energy recovery unit continuously generates electricity in motor mode until the system pressure is lower than the outlet pressure of the make-up pump; switching the valve group to short-circuit the pump / motor inlet and outlet ports and pumping oil at low speed to clean the pipeline; and consuming the remaining electrical energy to a safe voltage or reserving it for later use via bidirectional DC / DC converter.

[0026] Furthermore, it includes automatic identification of components to be debugged: an RFID or QR code scanner is installed at the interface to automatically read the model and parameters, and the digital controller retrieves the corresponding debugging template; if no template is available, it enters the manual configuration wizard; it also includes an energy management module: calculating the energy efficiency ratio in real time. ; in, For system energy efficiency ratio, To recover power, To release power to the buffer device, The buffer device absorbs power. Input power to the grid and display it when... When the value is less than 0.5, a check is prompted; it also includes cloud synchronization and remote diagnostics: a built-in IoT communication module generates an OPC UA or MQTT message after each debugging and uploads it to a remote server; in case of a fault, a fault code is sent to the maintenance terminal and remote VPN diagnostics are supported; it also includes vibration and noise diagnostics: a triaxial accelerometer and a sound pressure level sensor are installed on the housing, a 5-second signal is collected at each steady-state point and the characteristic frequency is extracted by FFT and compared with a healthy sample, and abnormalities are indicated by bearing wear, distribution plate abnormality or cavitation.

[0027] Furthermore, the digital controller also includes a self-learning optimization module: it records the pressure response, current curve and recycling efficiency of each debugging session; after the same type of component has been debugged more than 10 times, it uses the least squares method or neural network algorithm to automatically tune the PID parameters, load step hold time and charge / discharge threshold, so that the subsequent debugging time is shortened by more than 15% on average and the recycling efficiency is improved by more than 5%.

[0028] Furthermore, the interface of the component to be debugged adopts a quick-change zero-leakage hydraulic joint with an integrated self-sealing check valve. Before connection, the controller ensures that the interface pipeline is depressurized to zero. After connection, a proximity switch is used to confirm that it is locked in place; otherwise, starting is prohibited. The main drive motor of the auxiliary power unit is a permanent magnet synchronous servo motor with a rated speed of 2000-4000 rpm, equipped with an incremental encoder and a temperature sensor. The controller adjusts its speed through a vector algorithm. The hydraulic pump in the energy recovery loading unit is a variable axial piston, and its displacement is steplessly adjusted by a proportional electromagnet or stepper motor. At low flow rates, the displacement is automatically reduced to improve power generation efficiency, and at high flow rates, the displacement is increased to avoid overspeed.

[0029] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of protection of this application is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of one or more embodiments of this application as described above, which are not provided in detail for the sake of brevity.

[0030] One or more embodiments in this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments in this application should be included within the protection scope of this application.

Claims

1. A method for energy-saving assembly and debugging of hydraulic components, characterized in that, Includes the following steps: S1. Construct a closed-loop debugging system consisting of an energy recovery loading unit, an auxiliary power unit, a digital controller, and interfaces for the components to be debugged; S2. Perform system initialization and energy self-check, and the digital controller controls the oil replenishment pump in the auxiliary power unit to charge the energy buffer device to the preset standby pressure; S3. Connect the component to be debugged to the interface, and drive the component to be debugged by the auxiliary power unit to perform no-load break-in; S4. Entering the stepped load debugging stage, the digital controller sends the target load command to the energy recovery loading unit according to the preset debugging curve to perform dynamic performance debugging and simulate impact load, alternating load and pulse load. S5. After debugging, perform the unloading and residual energy recovery steps to convert the residual pressure energy in the system back into electrical energy storage through the energy recovery loading unit, and disassemble the debugged components.

2. The energy-saving assembly and debugging method for hydraulic components according to claim 1, characterized in that, The energy recovery loading unit includes: a reversible hydraulic pump, whose inlet is connected to the outlet of the component under test via a first high-pressure pipeline; a servo motor, whose output shaft is rigidly connected to the rotating shaft of the hydraulic pump via a coupling; a servo driver, whose power end is connected to the stator winding of the servo motor via a three-phase cable, and whose control end is connected to the digital controller via a fieldbus; a rectification and feedback unit connected between the DC bus of the servo driver and the power grid; a DC bus capacitor bank connected in parallel to the DC bus as an instantaneous energy buffer; and a hydraulic switching valve group located between the outlet of the hydraulic pump and the oil tank. The auxiliary power unit includes: a main drive motor with a power of 30%-50% of the rated power of the component under test; a fixed-displacement or variable-displacement hydraulic pump driven by the main drive motor; a replenishing pump driven independently by a small-power auxiliary motor or connected to the main drive motor via a clutch; a low-pressure suction filter; a high-pressure fine filter; and an overflow safety valve with a set pressure of 1.1-1.2 times the maximum working pressure of the system.

3. The energy-saving assembly and debugging method for hydraulic components according to claim 1, characterized in that, The system initialization and energy self-test steps specifically include: the digital controller performs a self-test on all sensors after power-on; the oil pump operates at 20%-30% of its rated speed, while simultaneously opening the solenoid shut-off valve to charge the energy buffer device; when the pressure reaches the preset standby pressure... And the voltage reaches It enters standby mode when the time is up; if the time is not reached, an alarm is triggered; the no-load break-in step specifically includes: the energy recovery loading unit is set to "zero torque" mode; the component to be tested operates at 20%-30% of its rated speed for 30-60 seconds.

4. The energy-saving assembly and debugging method for hydraulic components according to claim 1, characterized in that, The dynamic performance debugging includes: impact load simulation, outputting 120% of the rated pressure, a step command with a rise time of <20 ms, rising to the target within 50 ms, maintaining it for 100 ms and then recovering, repeating 3-5 times; sinusoidal alternating load simulation, outputting a sine command with an amplitude of ±30% and a frequency sweep of 0.1 Hz-20 Hz; and square wave load simulation, outputting a square wave command with a period of 22 seconds and a duty cycle of 50%.

5. The energy-saving assembly and debugging method for hydraulic components according to claim 1, characterized in that, It also includes precise measurement of leakage: an oval gear flow meter or mass flow meter with an accuracy within ±0.5% connected in series at the oil drain port of the component to be tested; the average flow rate is read for 5 consecutive seconds at each steady-state pressure point, and if it exceeds the preset threshold, it is deemed unqualified.

6. The energy-saving assembly and debugging method for hydraulic components according to claim 1, characterized in that, It also includes multi-level safety protection: the first safety threshold is automatic pressure relief when the accumulator pressure is >1.15 times the maximum working pressure; the second safety threshold is blocking PWM and energy consumption braking when the DC bus voltage is >1.2 times the rated voltage; the third safety threshold is emergency shutdown, power supply cut-off, and unloading within 1 second when the outlet pressure of the component to be tested is >1.3 times the rated pressure or the oil temperature is >65℃; all safety events trigger audible and visual alarms and store 10 seconds of data before and after the fault.

7. The energy-saving assembly and debugging method for hydraulic components according to claim 1, characterized in that, The unloading and residual energy recovery steps specifically include: gradually reducing the load to zero in 10% increments of the rated pressure; during the load reduction process, the energy recovery unit continuously generates electricity in motor mode until the system pressure is lower than the outlet pressure of the replenishing pump; switching the valve group to short-circuit the pump inlet and outlet and pumping oil at low speed to clean the pipeline; and consuming the remaining electrical energy to a safe voltage or reserving it for later use through bidirectional DC / DC converter.

8. The energy-saving assembly and debugging method for hydraulic components according to claim 1, characterized in that, It also includes automatic identification of components to be debugged: an RFID or QR code scanner is installed at the interface to automatically read the model and parameters, and the digital controller retrieves the corresponding debugging template; if no template is available, it enters the manual configuration wizard; it also includes an energy management module: real-time calculation of energy efficiency ratio. ； in, For system energy efficiency ratio, To recover power, To release power to the buffer device, To absorb power for the buffer device, Input power to the grid and display it when... When the value is less than 0.5, a check is prompted; it also includes cloud synchronization and remote diagnostics: a built-in IoT communication module generates an OPC UA or MQTT message after each debugging and uploads it to a remote server; in case of a fault, a fault code is sent to the maintenance terminal and remote VPN diagnostics are supported; it also includes vibration and noise diagnostics: a triaxial accelerometer and a sound pressure level sensor are installed on the housing, a 5-second signal is collected at each steady-state point and the characteristic frequency is extracted by FFT and compared with a healthy sample, and abnormalities are indicated by bearing wear, distribution plate abnormality or cavitation.

9. The energy-saving assembly and debugging method for hydraulic components according to claim 1, characterized in that, The digital controller also includes a self-learning optimization module: it records the pressure response, current curve and recovery efficiency of each debugging session; after the same type of component has been debugged more than 10 times, it automatically tunes the PID parameters, load step hold time and charge / discharge threshold using the least squares method or neural network algorithm, so that the subsequent debugging time is shortened by an average of more than 15% and the recovery efficiency is improved by more than 5%.

10. The energy-saving assembly and debugging method for hydraulic components according to claim 1, characterized in that, The interface of the component to be debugged adopts a quick-change zero-leakage hydraulic joint with an integrated self-sealing check valve. Before connection, the controller ensures that the interface pipeline is depressurized to zero. After connection, a proximity switch is used to confirm that it is locked in place; otherwise, starting is prohibited. The main drive motor of the auxiliary power unit is a permanent magnet synchronous servo motor with a rated speed of 2000-4000 rpm, equipped with an incremental encoder and a temperature sensor. The controller adjusts its speed through a vector algorithm. The hydraulic pump in the energy recovery loading unit is a variable displacement axial piston, and its displacement is steplessly adjusted by a proportional electromagnet or stepper motor. At low flow rates, the displacement is automatically reduced to improve power generation efficiency, and at high flow rates, the displacement is increased to avoid overspeed.

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