A control system and method for online automatic oil replacement and replenishment of a closed hydraulic device

Abstract

This invention relates to a control system and method for online automatic oil replenishment and replacement of closed-loop hydraulic equipment, belonging to the field of hydraulic control. It includes a monitoring module, a scheduling module, an oil replacement module, an oil replenishment module, and a refueling device. The monitoring module is electrically connected to the scheduling module, which in turn is electrically connected to both the oil replacement module and the oil replenishment module. The monitoring module detects and determines whether the online hydraulic equipment needs oil replenishment or replacement, and the number of units requiring such replenishment or replacement. The scheduling module schedules operations based on the oil replenishment and replacement needs. The oil replacement module performs an oil replacement operation when the oil replacement conditions are met; the oil replenishment module performs an oil replenishment operation when the oil replenishment conditions are met. This solution achieves automatic oil replenishment and replacement control for multiple closed-loop hydraulic devices, enabling timely fulfillment of the oil replacement or replenishment needs of each device, improving maintenance efficiency, reducing equipment failure rates, extending equipment lifespan, and reducing costs.

Description

Technical Field

[0001] This invention belongs to the field of hydraulic control and relates to a control system and method for online automatic oil changing and replenishment of closed-loop hydraulic equipment. Background Technology

[0002] With the rapid development and technological advancements in hydraulic technology, closed-loop hydraulic equipment is becoming increasingly widely used in industries such as metallurgy, light industry, power, chemical, mining, and coal. However, closed-loop hydraulic equipment differs from traditional open-loop hydraulic systems in that it has a smaller oil capacity and relies on internal hydraulic oil for operation. To ensure sufficient pump suction, a certain pressure is typically maintained inside the closed-loop hydraulic equipment. However, since leakage is unavoidable, timely oil replenishment is necessary to maintain the internal pressure. Furthermore, after prolonged operation, due to wear and aging of components, regular oil changes are required to ensure normal operation, improve system stability, reduce equipment failure rates, and increase production efficiency.

[0003] Therefore, during the use of closed-loop hydraulic equipment, equipment inspection and maintenance are crucial, requiring timely oil replenishment and regular oil changes. Currently, oil changes and replenishment for closed-loop hydraulic equipment are mainly performed manually, especially for distributed, single-unit closed-loop equipment. The dispersed and numerous nature of these devices leads to untimely maintenance, high costs, low efficiency, high equipment failure rates, short lifespans, and low production efficiency. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide an online automatic oil replenishment and replacement control system and method. Through the linkage control between the closed hydraulic equipment and the oiling device, the system can quickly replace or replenish the oil in the closed hydraulic equipment. In particular, when multiple closed hydraulic equipment exist at the same time, it can meet the oil replacement or replenishment needs of each closed hydraulic equipment in a timely manner, improve maintenance efficiency, reduce equipment failure rate, extend equipment service life, and reduce costs.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] An online automatic oil replenishment and replacement control system includes a monitoring module, a scheduling module, an oil replacement module, an oil replenishment module, and a refueling device; the monitoring module is electrically connected to the scheduling module, and the scheduling module is electrically connected to both the oil replacement module and the oil replenishment module.

[0007] The monitoring module monitors the inlet pressure of multiple online hydraulic devices and determines whether the inlet pressure is less than a preset inlet pressure threshold. If so, there is a need for oil replenishment, and it determines whether the oil replenishment conditions are met. The monitoring module also monitors the time interval between the last oil change and the last oil change for each online hydraulic device and determines whether the time interval is greater than a preset time interval threshold. If so, there is a need for oil change, and it determines whether the currently monitored online hydraulic device is in a non-working state. If it is in a non-working state, the oil change conditions are met. The monitoring module also records the order in which each online hydraulic device meets the oil change conditions. The monitoring module also determines the intensity of the oil replenishment need based on the system pressure of each online hydraulic device.

[0008] The scheduling module performs scheduling based on the oil replenishment demand and the oil change demand, and sends oil change instructions to the oil change module in the order in which the oil change conditions are met, and sends oil replenishment instructions to the oil replenishment module in descending order of the intensity of the oil replenishment demand.

[0009] When the oil change conditions are met, the oil change module controls the solenoid valve corresponding to the refueling circuit in the refueling device to perform an oil change operation according to the oil change command; when the oil replenishment conditions are met, the oil replenishment module controls the solenoid valve in the refueling circuit in the refueling device to perform an oil replenishment operation according to the oil replenishment command.

[0010] Glossary:

[0011] Oil replenishment operation: As the hydraulic oil in the online hydraulic equipment is used, leakage occurs, resulting in low inlet pressure that does not meet production needs. Therefore, oil replenishment refers to adding hydraulic oil to the online hydraulic equipment.

[0012] Oil change operation: As hydraulic equipment is used, the hydraulic oil becomes contaminated, which reduces the cleanliness level of the hydraulic oil and affects the service life of the equipment. Therefore, the hydraulic oil needs to be replaced. When changing the oil, the original contaminated hydraulic oil needs to be drained while clean hydraulic oil is injected. This includes the oil replenishment process. Therefore, oil change refers to the entire process from replacement to oil replenishment.

[0013] Furthermore, it also includes an alarm module, which is used to issue alarms for high oil temperature, low liquid level, and low system pressure of the refueling device. When the corresponding alarm conditions are met, an alarm signal is issued and the alarm signal is sent to the monitoring module.

[0014] Furthermore, the monitoring module determines whether the refueling conditions are met based on whether it receives an alarm signal from the refueling device system. This solution uses the receipt of an alarm signal as a criterion for the monitoring module's judgment. Through cross-use of information and interlocking control, compared to collecting a separate signal as a judgment parameter, it improves information utilization and reduces system energy consumption.

[0015] Furthermore, it also includes an interlocking module, which controls the refueling pump of the refueling device according to the alarm signal; the interlocking control includes starting the backup pump when the refueling pump is damaged, and starting and stopping the heater according to the oil temperature.

[0016] This solution improves refueling reliability by interlocking the backup pump, preventing online pump malfunctions from affecting online equipment maintenance. At the same time, by starting and stopping the heater, it avoids the oil temperature being too low and the oil being too thick when the ambient temperature is low, which would affect the efficiency of oil change and replenishment, and also avoids the oil temperature being too high.

[0017] Furthermore, it also includes a parameter module, which stores preset parameters that serve as alarm conditions in the alarm module. The preset parameters include the refueling device system pressure parameters, liquid level alarm threshold, and oil temperature heating threshold.

[0018] Furthermore, the oil change module also includes controlling the switching sequence and time interval of the inlet solenoid valve and outlet solenoid valve of the online hydraulic equipment.

[0019] A control method for online automatic oil replenishment and replacement of closed-loop hydraulic equipment, based on an online automatic oil replenishment and replacement control system for closed-loop hydraulic equipment, includes the following steps:

[0020] S1. Monitor multiple online hydraulic devices to determine if they require oil replenishment or oil change.

[0021] Specifically:

[0022] Monitor the inlet pressure of multiple online hydraulic devices and determine whether the inlet pressure is less than a preset inlet pressure threshold. If so, there is a need for oil replenishment.

[0023] Monitor the time interval between the last oil change and the last time for multiple online hydraulic devices, and determine whether the time interval is greater than a preset time interval threshold. If so, there is a need for an oil change.

[0024] S2. Count the online hydraulic equipment that needs oil change and determine whether the oil change conditions are met. When the online hydraulic equipment is not working, the result is yes, and mark the oil change priority according to the time sequence of each online hydraulic equipment meeting the oil change conditions. At the same time, count the online hydraulic equipment that needs oil replenishment and mark the oil replenishment priority according to the inlet pressure of each online hydraulic equipment. The lower the inlet pressure, the higher the oil replenishment priority.

[0025] S3. Determine whether the refueling device is operating normally. If so, the refueling conditions are met, and refueling operations are performed on the online hydraulic equipment in sequence according to the intensity of the refueling demand.

[0026] Specifically, it includes:

[0027] The refueling device opens the refueling circuit solenoid valve. After a preset waiting time, it opens the inlet solenoid valve of the online hydraulic equipment and monitors the inlet pressure of the online hydraulic equipment that is being refueled. When the inlet pressure rises to the inlet pressure threshold, it closes the inlet solenoid valve and then closes the refueling circuit solenoid valve, completing the refueling operation of the online hydraulic equipment that is being refueled. It then switches to the next online hydraulic equipment to perform the refueling operation. When the number of online hydraulic equipment with refueling needs is 0, it executes S4.

[0028] S4. Perform oil change operations on the online hydraulic equipment in sequence according to the oil change priority;

[0029] Specifically, it includes:

[0030] Open the refueling circuit solenoid valve of the refueling device. After a preset waiting time, open the inlet and outlet solenoid valves of the online hydraulic equipment. After the set oil change time is completed, close the outlet solenoid valve of the online hydraulic equipment currently undergoing oil change. Monitor the inlet pressure of the online hydraulic equipment undergoing oil change. When the inlet pressure rises to the inlet pressure threshold, close the inlet solenoid valve, and then close the refueling circuit solenoid valve to complete the oil change operation of the online hydraulic equipment currently undergoing oil change. Switch to the next online hydraulic equipment to perform the oil change operation.

[0031] Furthermore, in S3, the preset waiting time is determined based on the length of the oil circuit between the refueling device and the online hydraulic equipment, as well as the system pressure of the refueling device.

[0032] Furthermore, in S4, determining whether the refueling device is operating normally includes determining that the refueling device is operating normally when the system pressure of the refueling device is greater than the preset system pressure parameter, the liquid level of the refueling device is greater than the low liquid level alarm threshold, and the oil temperature of the refueling device is less than the high oil temperature alarm threshold and greater than the low oil temperature alarm threshold.

[0033] Furthermore, in S4, if a new oil replenishment requirement is detected during the oil change operation, S2 to S3 are re-executed after the oil change operation is completed.

[0034] The beneficial effects of this invention are as follows:

[0035] This solution ensures the reliability of the refueling system by monitoring the system status of the refueling device online. It realizes online automatic oil change / replenishment demand detection for multiple distributed closed hydraulic devices and performs oil change / replenishment operations after the oil change / replenishment conditions are met. This greatly improves the oil change and replenishment efficiency of closed hydraulic devices, increases the operating rate of hydraulic devices, improves the cleanliness of hydraulic fluid, and thus extends the service life of hydraulic devices.

[0036] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0037] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0038] Figure 1 This is a block diagram of the control system of the present invention;

[0039] Figure 2 This is a flowchart illustrating the oil replenishment and oil change method for an online hydraulic device in this invention. Detailed Implementation

[0040] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0041] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0042] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0043] Please see Figures 1-2This describes an online automatic oil replenishment and replacement control system and method. The control system includes software components for controlling the transmission logic of hydraulic equipment and hardware components for controlling the specific actions of the refueling device. For example... Figure 1 As shown, the hydraulic equipment control system consists of a monitoring module, a scheduling module, an oil changing module, and an oil replenishment module connected in sequence by electrical connection. The refueling device control system consists of a parameter module, an alarm module, an interlocking module, and a control module connected in sequence by electrical connection.

[0044] In this embodiment, the hydraulic equipment control system and the closed hydraulic equipment are connected by an electrical circuit, which includes TCP / IP communication, 485 serial communication, and hard-wired connection; the refueling device control system and the closed hydraulic equipment are connected by an oil circuit, which includes hard pipe and flexible hose connection.

[0045] The monitoring module detects and determines whether online hydraulic equipment needs oil replenishment and the number of units, whether it needs oil change and the number of units, and whether conditions for oil change are met. It also monitors and determines whether the refueling device is ready. Specifically:

[0046] The monitoring module detects the inlet pressure of the online hydraulic equipment and determines whether the inlet pressure is lower than the system's set inlet pressure threshold. If the inlet pressure is low, it indicates that oil replenishment is needed (i.e., there is an oil replenishment requirement). Based on this, the number of online hydraulic equipment that needs oil replenishment is determined, counted, and marked with a level according to the system pressure of the online hydraulic equipment. The marked level indicates the intensity of the oil replenishment requirement. When an online hydraulic equipment has an oil replenishment requirement, the monitoring module determines whether the monitored online hydraulic equipment is currently in operation. If it is not in operation, the oil change condition is met.

[0047] The monitoring module determines whether an oil change is needed by timing the time interval since the last oil change of the online hydraulic equipment. When the time interval exceeds a preset threshold, an oil change is required (i.e., an oil change is needed). Then, based on the determination result, the online hydraulic equipment requiring oil changes is counted and numbered according to the order in which the time interval threshold is reached. The module also detects and determines whether the online hydraulic equipment meets the conditions for an oil change, i.e., whether the refueling device is operating normally. This can be determined by the alarm module of the refueling device control system to determine if a fault has occurred. If no fault has occurred, the oil change conditions are considered met. The determination of whether a fault has occurred is achieved by whether an alarm signal is received; receiving an alarm signal indicates a fault has occurred, and vice versa.

[0048] The scheduling module dispatches equipment based on replenishment and oil change requirements. When multiple online closed-loop hydraulic devices are detected as needing replenishment or oil change, the scheduling module rationally schedules the replenishment and oil change order to ensure that any online closed-loop device can complete replenishment or oil change in an orderly manner. The scheduling module issues oil change commands to the oil change module in the order in which oil change conditions are met, and issues replenishment commands to the replenishment module in descending order of the intensity of the replenishment demand (i.e., from low to high hydraulic system pressure).

[0049] When the oil change conditions are met, the oil change module controls the corresponding solenoid valve in the oil change circuit of the refueling device to perform an oil change operation according to the oil change command. When the oil replenishment conditions are met, the oil replenishment module controls the solenoid valve in the oil replenishment circuit of the refueling device to perform an oil replenishment operation according to the oil replenishment command. In specific implementation, to make the control process smoother, this solution also includes a control module in the refueling device control system, which converts the operation commands of the oil replenishment module and the oil change module into action signals that the solenoid valves can directly recognize, and controls the specific actions of the solenoid valves in each circuit.

[0050] In the refueling device control system, the alarm module detects the operating status of the refueling device and determines whether to issue alarms for high oil temperature, low liquid level, or low system pressure based on alarm conditions. The parameter module stores preset parameters for the alarm conditions, including system pressure, liquid level alarm threshold, and oil temperature heating threshold. When an alarm is triggered, the alarm signal is transmitted to the monitoring module of the hydraulic equipment control system to determine if the refueling device meets the required conditions (i.e., whether a malfunction has occurred). Signal transmission includes TCP / IP communication, 485 serial communication, and hardwiring. Simultaneously, an interlocking module associates the alarm signals from the alarm module with devices such as the refueling pump, standby pump, and heater. For example, when the online pump fails, the standby pump is interlocked and activated; when the oil temperature is low, the heater is activated; when the oil temperature is high, the heater is deactivated.

[0051] This solution also provides a control method for online automatic oil replenishment and oil change, which can be implemented through a module with corresponding functions in the online automatic oil replenishment and oil change control system provided in this solution, including the following steps:

[0052] S1. Monitor whether multiple online hydraulic devices require oil changes or replenishment;

[0053] Specifically:

[0054] Monitor the inlet pressure of multiple online hydraulic devices and determine whether the inlet pressure is less than a preset inlet pressure threshold. If so, there is a need for oil replenishment.

[0055] Monitor the time interval between the last oil change and the last time for multiple online hydraulic devices, and determine whether the time interval is greater than a preset time interval threshold. If so, there is a need for an oil change.

[0056] S2. Record the number and serial number of online hydraulic equipment that has an oil change or replenishment requirement, and mark the serial number in the order of when each online hydraulic equipment meets the oil change conditions. At the same time, determine the intensity of the replenishment requirement based on the system pressure of each online hydraulic equipment. The lower the system pressure, the greater the intensity of the replenishment requirement.

[0057] S3. Determine whether the refueling device is operating normally. If so, the refueling conditions are met, and refueling operations are performed on the online hydraulic equipment in sequence according to the intensity of the refueling demand.

[0058] Specifically, it includes:

[0059] The refueling device opens the refueling circuit solenoid valve. After a preset waiting time, it opens the inlet solenoid valve of the online hydraulic equipment and monitors the inlet pressure of the online hydraulic equipment that is being refueled. When the inlet pressure rises to the inlet pressure threshold, it closes the inlet solenoid valve and then closes the refueling circuit solenoid valve, completing the refueling operation of the online hydraulic equipment that is being refueled. It then switches to the next online hydraulic equipment to perform the refueling operation. When the number of online hydraulic equipment with refueling needs is 0, it executes S4.

[0060] S4. Perform oil change operations on the online hydraulic equipment in sequence according to the oil change priority;

[0061] Specifically, it includes:

[0062] Open the refueling circuit solenoid valve of the refueling device. After a preset waiting time (the preset waiting time can be determined based on the length of the oil circuit between the refueling device and the online hydraulic equipment, as well as the system pressure of the refueling device), open the inlet and outlet solenoid valves of the online hydraulic equipment. After the set oil change time is completed, close the outlet solenoid valve of the online hydraulic equipment currently undergoing oil change. Monitor the inlet pressure of the online hydraulic equipment undergoing oil change. When the inlet pressure rises to the inlet pressure threshold, close the inlet solenoid valve, and then close the refueling circuit solenoid valve to complete the oil change operation of the online hydraulic equipment currently undergoing oil change. Switch to the next online hydraulic equipment to perform the oil change operation.

[0063] In the above method, determining whether the refueling device is operating normally includes the following: when the refueling device system pressure is greater than the preset refueling device system pressure parameter, the refueling device liquid level is greater than the low liquid level alarm threshold, and the refueling device oil temperature is less than the high oil temperature alarm threshold, or greater than the low oil temperature alarm threshold, all four conditions are met simultaneously, and the refueling device is judged to be operating normally; conversely, when any one of the conditions is not met, it indicates that there is a fault in the refueling device that needs to be eliminated. At this time, an alarm is triggered by the alarm device to prompt maintenance personnel to eliminate the fault.

[0064] like Figure 2 The diagram shows the flow chart for replenishing and changing oil in an online hydraulic system. When multiple online hydraulic systems simultaneously require replenishment and oil changes, the replenishment and oil change requirements of all systems are monitored in real time. According to this scheme, replenishment is prioritized to meet the replenishment needs, thus satisfying normal production requirements. After all replenishment needs are met, oil changes are performed to meet the oil change requirements, preventing the hydraulic oil cleanliness level from affecting the equipment's lifespan. If a new replenishment need is detected while all replenishment needs are met and an oil change is being performed, the newly detected replenishment need is met first after the current online hydraulic system's oil change operation is completed, and then the oil change is restarted according to the oil change priority.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A control system for online automatic oil replenishment and oil change, characterized in that: It includes a monitoring module, a scheduling module, an oil change module, an oil replenishment module, and a refueling device; the monitoring module is electrically connected to the scheduling module, and the scheduling module is electrically connected to both the oil change module and the oil replenishment module. The monitoring module monitors the inlet pressure of multiple online hydraulic devices and determines whether the inlet pressure is less than a preset inlet pressure threshold. If so, there is a need for oil replenishment, and it determines whether the oil replenishment conditions are met. The monitoring module also monitors the time interval between the last oil change and the last oil change for each online hydraulic device and determines whether the time interval is greater than a preset time interval threshold. If so, there is a need for oil change, and it determines whether the currently monitored online hydraulic device is in a non-working state. If it is in a non-working state, the oil change conditions are met. The monitoring module also records the order in which each online hydraulic device meets the oil change conditions. The monitoring module also determines the intensity of the oil replenishment need based on the inlet pressure of each online hydraulic device. The scheduling module performs scheduling based on the oil replenishment demand and the oil change demand, and sends oil change instructions to the oil change module in the order in which the oil change conditions are met, and sends oil replenishment instructions to the oil replenishment module in descending order of the intensity of the oil replenishment demand. The oil change module also includes the switching sequence and time interval of the inlet solenoid valve and the outlet solenoid valve of the online hydraulic equipment; When the oil change conditions are met, the oil change module controls the solenoid valves corresponding to the refueling circuit in the refueling device, as well as the inlet and outlet solenoid valves of the online hydraulic equipment, to perform an oil change operation according to the oil change command; when the oil replenishment conditions are met, the oil replenishment module controls the solenoid valves of the refueling circuit in the refueling device, as well as the inlet solenoid valve of the online hydraulic equipment, to perform an oil replenishment operation according to the oil replenishment command.

2. The online automatic oil replenishment and replacement control system according to claim 1, characterized in that: It also includes an alarm module, which is used to issue alarms for high oil temperature, low liquid level, and low system pressure of the refueling device. When the corresponding alarm conditions are met, an alarm signal is issued and the alarm signal is sent to the monitoring module.

3. The online automatic oil replenishment and change control system according to claim 2, characterized in that: The monitoring module determines whether the refueling conditions are met based on whether it receives an alarm signal from the refueling device system.

4. The online automatic oil replenishment and change control system according to claim 3, characterized in that: It also includes an interlocking module, which controls the refueling pump of the refueling device according to the alarm signal; the interlocking control includes starting the backup pump when the refueling pump is damaged, and starting and stopping the heater according to the oil temperature.

5. The online automatic oil replenishment and change control system according to claim 2, characterized in that: It also includes a parameter module, which stores preset parameters that serve as alarm conditions in the alarm module. The preset parameters include the refueling device system pressure parameters, liquid level alarm threshold, and oil temperature heating threshold.

6. A control method for online automatic oil replenishment and oil change, based on the online automatic oil replenishment and oil change control system as described in any one of claims 1 to 5, characterized in that: Includes the following steps: S1. Monitor multiple online hydraulic devices to determine if they require oil replenishment or oil change. Specifically: Monitor the inlet pressure of multiple online hydraulic devices and determine whether the inlet pressure is less than a preset inlet pressure threshold. If so, there is a need for oil replenishment. Monitor the time interval between the last oil change and the last time for multiple online hydraulic devices, and determine whether the time interval is greater than a preset time interval threshold. If so, there is a need for an oil change. S2. Count the online hydraulic equipment that needs oil change and determine whether the oil change conditions are met. If the online hydraulic equipment is not working, the result is yes. Then mark the oil change priority according to the time sequence of the online hydraulic equipment meeting the oil change conditions. At the same time, count the online hydraulic equipment that needs oil replenishment and mark the oil replenishment priority according to the inlet pressure of each online hydraulic equipment. The lower the inlet pressure, the higher the oil replenishment priority. S3. Determine whether the refueling device is operating normally. If so, the refueling conditions are met, and refueling operations are performed on the online hydraulic equipment in sequence according to the intensity of the refueling demand. Specifically, it includes: The refueling device opens the refueling circuit solenoid valve. After a preset waiting time, it opens the inlet solenoid valve of the online hydraulic equipment and monitors the inlet pressure of the online hydraulic equipment that is being refueled. When the inlet pressure rises to the inlet pressure threshold, it closes the inlet solenoid valve and then closes the refueling circuit solenoid valve, completing the refueling operation of the online hydraulic equipment that is being refueled. It then switches to the next online hydraulic equipment to perform the refueling operation. When the number of online hydraulic equipment with refueling needs is 0, it executes S4. S4. Perform oil change operations on the online hydraulic equipment in sequence according to the oil change priority; Specifically, it includes: Open the refueling circuit solenoid valve of the refueling device. After a preset waiting time, open the inlet and outlet solenoid valves of the online hydraulic equipment. After the set oil change time is completed, close the outlet solenoid valve of the online hydraulic equipment currently undergoing oil change. Monitor the inlet pressure of the online hydraulic equipment undergoing oil change. When the inlet pressure rises to the inlet pressure threshold, close the inlet solenoid valve and the refueling circuit solenoid valve to complete the oil change operation of the online hydraulic equipment currently undergoing oil change. Switch to the next online hydraulic equipment to perform the oil change operation.

7. The online automatic oil replenishment and oil change control method according to claim 6, characterized in that: In S3 and S4, the preset waiting time is determined based on the length of the oil circuit between the refueling device and the online hydraulic equipment, as well as the system pressure of the refueling device.

8. The online automatic oil replenishment and oil change control method according to claim 6, characterized in that: Determining whether a refueling device is operating normally includes: when the system pressure of the refueling device is greater than the preset system pressure parameter, the liquid level of the refueling device is greater than the low liquid level alarm threshold, and the oil temperature of the refueling device is less than the high oil temperature alarm threshold or greater than the low oil temperature alarm threshold, the refueling device is considered to be operating normally.

9. The online automatic oil replenishment and oil change control method according to claim 6, characterized in that: In S4, if a new oil replenishment requirement is detected during the oil change operation, S2 to S3 are re-executed after the oil change operation is completed.

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