Oil supply system of hydraulic servo system

Abstract

The oil supply system for a hydraulic servo system belongs to the field of hydraulic transmission technology, and particularly relates to the oil supply for a hydraulic servo system. This system addresses the problems of existing oil supply systems, such as lack of versatility, non-reusability, difficulty in subsequent expansion, and the resulting significant waste of manpower and material resources. The system comprises an oil supply device, a data acquisition device, and a control device. The oil supply device comprises multiple sub-oil source modules and a connecting vessel. The control device comprises a main controller and multiple sub-controllers, each of which corresponds to each sub-oil source module. The oil supply system for a hydraulic servo system is suitable for supplying hydraulic oil to a hydraulic servo system.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic transmission, in particular to the oil source supply of a hydraulic servo system. Background Art

[0002] The large hydraulic servo system is a high-precision, high-response hydraulic transmission and control system that can be used as the power and control component of many existing test equipment, providing effective servo control and power supply for the test.

[0003] Large hydraulic servo systems are mainly composed of oil supply systems, actuators, control components, etc., among which:

[0004] Oil supply system: including pumps, oil tanks, etc., used to provide hydraulic oil to the hydraulic servo system, converting mechanical energy into hydraulic energy to provide a stable power source;

[0005] Actuator: such as a hydraulic cylinder or hydraulic motor, used to convert hydraulic energy into mechanical energy to drive the load to work;

[0006] Control elements: including servo valves, proportional valves, etc., which are used to adjust and control the flow, pressure and direction of hydraulic oil to meet the system's different control requirements for actuators.

[0007] The oil supply system is the power guarantee for large hydraulic servo systems, and a reasonable and standardized oil supply system is an important guarantee for the normal operation of large hydraulic servo systems.

[0008] Different test equipment has different usage scenarios and test requirements, and the hydraulic servo systems they use have different requirements for hydraulic oil supply flow. Existing large-scale hydraulic servo systems for test equipment all use non-standard products. In particular, the oil supply system needs to be designed differently for each different test equipment, depending on the usage scenario and test requirements. The resulting oil supply system lacks versatility, cannot be reused, and is difficult to expand later, resulting in a huge waste of manpower and material resources.

[0009] There is an urgent need for a universal, reusable, easily expandable, and standardized oil supply system. Summary of the Invention

[0010] The present invention proposes an oil source supply system for a hydraulic servo system, which solves the problems of the existing oil source supply system in lacking versatility, being non-reusable, being difficult to expand later, and causing huge waste of manpower and material resources.

[0011] The oil source supply system of the hydraulic servo system of the present invention comprises: an oil source supply device, a data acquisition device and a control device;

[0012] The oil source supply device includes a plurality of sub-oil source modules and a connecting vessel;

[0013] Each sub-oil source module includes a motor pump assembly, an oil tank and a butterfly valve; the motor pump assembly adopts a redundant design;

[0014] The motor pump assembly is used to draw hydraulic oil from the oil tank and supply it to the actuators of the hydraulic servo system;

[0015] The butterfly valve is used as a pipeline switch for supplying hydraulic oil to the actuator of the hydraulic servo system;

[0016] The oil tank is used to receive the hydraulic oil returned from the actuator of the hydraulic servo system;

[0017] The oil tanks of the multiple sub-oil source modules are connected via a communicating vessel; the communicating vessel has a given caliber and is used to make the oil properties of the hydraulic oil in the oil tanks of the multiple sub-oil source modules consistent;

[0018] The data acquisition device is used to collect the operating information of each sub-oil source module; the data acquisition device includes a liquid level meter, a temperature sensor and a butterfly valve switch signal detection device;

[0019] The liquid level meter is used to collect the liquid level information of the hydraulic oil in the oil tank of each sub-oil source module;

[0020] The temperature sensor is used to collect temperature information in the oil tank of each sub-oil source module;

[0021] The butterfly valve switch signal detection device is used to detect the switch signal at the butterfly valve to obtain the working status information of the butterfly valve;

[0022] The control device includes a main controller and multiple sub-controllers; the sub-controllers are set in a one-to-one correspondence with each sub-oil source module;

[0023] The sub-controller is used to collect the operating information of the corresponding sub-oil source module collected by the data collection device; it is also used to send the collected operating information of the corresponding sub-oil source module to the main controller; it is also used to control the operation of the corresponding sub-oil source module according to the operating instructions sent by the main controller;

[0024] The main controller is used to send operating instructions to the sub-controllers according to the received operating information of each sub-oil source module.

[0025] Furthermore, a preferred embodiment is provided, in which a partition is provided inside the oil tank of each sub-oil source module; the partition is provided between the cold oil zone and the hot oil zone, and is used to slow down the interaction speed of the hydraulic oil between the cold oil zone and the hot oil zone.

[0026] Furthermore, a preferred embodiment is provided, wherein the sub-oil source module further includes a relief valve;

[0027] The overflow valve is used to return excess hydraulic oil to the oil tank through the overflow valve when the hydraulic oil pressure of the system exceeds the rated pressure, so as to ensure that the hydraulic oil pressure of the system does not exceed the rated pressure.

[0028] Furthermore, a preferred embodiment is provided, wherein the sub-oil source module further includes a high-pressure oil filter and a high-pressure oil supply pipeline:

[0029] The high-pressure oil filter is used to filter out impurities in the hydraulic oil supplied to the actuator of the hydraulic servo system;

[0030] The high-pressure oil supply pipeline is used to supply the hydraulic oil after impurities are filtered out by the high-pressure oil filter to the actuator of the hydraulic servo system.

[0031] Furthermore, a preferred embodiment is provided, wherein the sub-oil source module further includes a low-pressure oil filter and a low-pressure oil supply pipeline:

[0032] The low-pressure oil filter is used to filter out impurities in the hydraulic oil returned to the oil tank from the actuator of the hydraulic servo system;

[0033] The low-pressure oil supply pipeline is used to deliver the hydraulic oil returned from the actuator of the hydraulic servo system and after impurities are filtered out by the low-pressure oil filter to the oil tank.

[0034] Furthermore, a preferred embodiment is provided, wherein the data acquisition device further includes an oil filter clogging sensor;

[0035] The oil filter clogging sensor is used to collect clogging information of the high-pressure oil filter and the low-pressure oil filter of each sub-oil source module.

[0036] Furthermore, a preferred embodiment is provided, wherein the sub-oil source module further includes a cooler;

[0037] The device is arranged between the low-pressure oil supply pipeline and the oil tank of the sub-oil source module, and is used to cool the hydraulic oil returned to the oil tank from the actuator of the hydraulic servo system.

[0038] Furthermore, a preferred embodiment is provided, wherein the sub-oil source module further includes an air filter:

[0039] The air filter is used to filter the air sucked into the oil tank of the sub-oil source module, and is also used to maintain the pressure in the oil tank balanced with the atmospheric pressure.

[0040] Furthermore, a preferred embodiment is provided, wherein the control device further includes a host computer:

[0041] The main controller is used to send the collected operating information of the corresponding sub-oil source module to the main controller;

[0042] The main controller includes an operation mode selection module;

[0043] The operation mode selection module is used to select between two operation modes: local mode and remote mode.

[0044] If the local file operation mode is selected, the main controller sends the operation instruction to the sub-controller;

[0045] If the remote operation mode is selected, the host computer sends operation instructions to the sub-controller via the main controller.

[0046] Furthermore, a preferred embodiment is provided, wherein the main controller further includes an alarm module:

[0047] The alarm module includes an oil temperature monitoring alarm submodule, a liquid level detection alarm submodule and a communication monitoring alarm submodule;

[0048] The oil temperature monitoring and alarm submodule is used to alarm when the temperature information collected by the temperature sensor reaches a given temperature threshold;

[0049] The liquid level detection alarm submodule is used to alarm when the liquid level information collected by the liquid level meter reaches a given liquid level threshold;

[0050] The communication monitoring alarm submodule is used to alarm when a communication failure occurs in the control device.

[0051] The present invention has the following beneficial effects:

[0052] 1. The oil source supply system of the hydraulic servo system described in the present invention is more practical and versatile than the existing oil source supply system by providing sub-oil source modules, and the functions of each sub-oil source module meet the actual project requirements. It can be widely used in various situations and can achieve modularization.

[0053] 2. The oil source supply system of the hydraulic servo system described in the present invention is achieved by physically connecting each sub-oil source module through a communicating vessel; the control device includes a sub-controller and a main controller on each sub-oil source module; each sub-oil source module is independent and fully functional, and can be used alone, or several sub-oil source modules can be modularly connected for expanded use; for different projects, it is only necessary to calculate the required hydraulic oil flow rate, and select the required sub-oil source modules and corresponding sub-controllers according to the flow rate, without having to redesign the oil source supply system as a whole, and the sub-oil source modules are reusable; it solves the problems of the existing oil source supply system lacking versatility, non-reusability, and difficulty in subsequent expansion, which causes a huge waste of manpower and material resources, and can meet the testing needs of large hydraulic equipment.

[0054] The oil source supply system of the hydraulic servo system of the present invention is suitable for supplying hydraulic oil to the hydraulic servo system. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0056] Figure 1 This is a schematic structural diagram of an oil source supply device in one embodiment of the present invention;

[0057] Figure 2 This is a schematic structural diagram of a sub-oil source module in one embodiment of the present invention;

[0058] Figure 3 A signal connection diagram of a control device in one embodiment of the present invention;

[0059] Figure 4 This is a schematic diagram of the structure of the cold oil area, hot oil area and partition in the oil tank in one embodiment of the present invention;

[0060] Reference numerals:

[0061] 1. Motor; 2. Pump; 3. Butterfly valve; 4. Sub-controller; 5. External liquid level gauge; 6. Overflow valve; 7. High-pressure oil filter; 8. Fuel tank; 9. Liquid level gauge; 10. Temperature sensor; 11. Air filter; 12. Low-pressure oil filter; 13. Cooler; 14. Low-pressure oil return line; 15. High-pressure oil supply line; 20. Main controller; 201. Control cabinet; 202. PLC in control cabinet; 203. PLC in control box; 21. Host computer; 30. Sub-oil source module; 31. Connecting vessel; 40. Partition; 41. Hot oil area; 42. Cold oil area. DETAILED DESCRIPTION

[0062] In order to make the technical solutions and advantages of the present invention more clearly described, the specific embodiments of the present invention will be further described in detail and completely in conjunction with the accompanying drawings. The various embodiments described below are only part of the preferred embodiments of the present invention, rather than all implementation plans; the various embodiments described below are intended to explain the present invention and cannot be understood as limiting the present invention; the reasonable combination of the technical features defined in the various embodiments of the present invention, as well as all other implementation plans obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work, all fall within the scope of protection of the present invention.

[0063] In one embodiment, an oil source supply system for a hydraulic servo system is provided, the system comprising: an oil source supply device, a data acquisition device, and a control device;

[0064] The oil source supply device includes a plurality of sub-oil source modules and a connecting vessel;

[0065] Each sub-oil source module includes a motor pump assembly, an oil tank and a butterfly valve; the motor pump assembly adopts a redundant design;

[0066] The motor pump assembly is used to draw hydraulic oil from the oil tank and supply it to the actuators of the hydraulic servo system;

[0067] The butterfly valve is used as a pipeline switch for supplying hydraulic oil to the actuator of the hydraulic servo system;

[0068] The oil tank is used to receive the hydraulic oil returned from the actuator of the hydraulic servo system;

[0069] The oil tanks of the multiple sub-oil source modules are connected via a communicating vessel; the communicating vessel has a given caliber and is used to make the oil properties of the hydraulic oil in the oil tanks of the multiple sub-oil source modules consistent;

[0070] The data acquisition device is used to collect the operating information of each sub-oil source module; the data acquisition device includes a liquid level meter, a temperature sensor and a butterfly valve switch signal detection device;

[0071] The liquid level meter is used to collect the liquid level information of the hydraulic oil in the oil tank of each sub-oil source module;

[0072] The temperature sensor is used to collect temperature information in the oil tank of each sub-oil source module;

[0073] The butterfly valve switch signal detection device is used to detect the switch signal at the butterfly valve to obtain the working status information of the butterfly valve;

[0074] The control device includes a main controller and multiple sub-controllers; the sub-controllers are set in a one-to-one correspondence with each sub-oil source module;

[0075] The sub-controller is used to collect the operating information of the corresponding sub-oil source module collected by the data collection device; it is also used to send the collected operating information of the corresponding sub-oil source module to the main controller; it is also used to control the operation of the corresponding sub-oil source module according to the operating instructions sent by the main controller;

[0076] The main controller is used to send operating instructions to the sub-controllers according to the received operating information of each sub-oil source module.

[0077] It should be noted that the oil supply system of hydraulic equipment plays a vital role in the entire hydraulic system. It is responsible for providing the system with stable and sufficient hydraulic oil. The butterfly valve, as a key component in the hydraulic system, also plays an important role.

[0078] A butterfly valve, also known as a flap valve or butterfly valve, is a simple regulating valve. Its opening and closing mechanism is a disc-shaped butterfly plate that rotates around its own axis inside the valve. The valve is opened and closed by rotating the butterfly plate. In the oil supply system of hydraulic equipment:

[0079] When the butterfly valve is open, each sub-oil source module supplies hydraulic oil to the actuator of the hydraulic servo system through the pipeline;

[0080] When the butterfly valve is closed, the pipeline for each sub-oil source module to supply hydraulic oil to the actuator of the hydraulic servo system is cut off.

[0081] During the maintenance or overhaul of the hydraulic system, the butterfly valve can be used as a shut-off or isolation device to cut off the flow path of the hydraulic oil, thereby ensuring that maintenance personnel can work safely.

[0082] In this embodiment, the motor pump assembly adopts a redundant design as follows:

[0083] Each sub-oil source module includes at least two motor pump assemblies, and the at least two motor pump assemblies are arranged in parallel.

[0084] When one motor pump assembly fails, it does not affect the normal operation of other motor pump assemblies.

[0085] In this embodiment, the motor pump assembly includes a motor 1 and a pump 2;

[0086] The pump 2 is used to extract hydraulic oil from the oil tank under the drive of the motor 1.

[0087] In this embodiment, the communicating vessel is a communicating pipe having a predetermined diameter and configured to ensure that the hydraulic oil in the oil tank has uniform oil properties, including the oil level and oil temperature.

[0088] By setting a given caliber, the hydraulic oil's oil characteristics are made consistent to meet the need for oil flow balance between tanks.

[0089] In addition, in one embodiment, the given diameter of the communicating vessel is 4 to 5 times the diameter of the oil return line (ie, the line for returning hydraulic oil from the actuator of the hydraulic servo system).

[0090] In addition, in one embodiment, a manifold is connected to the bottom of the oil tank of each sub-oil source module. That is, a hole is drilled in the bottom of the oil tank, and then a manifold is connected to the drilled position to ensure that the hydraulic oil can still flow when the oil becomes low.

[0091] In this embodiment, in order to monitor the normal operation of the system, each sub-oil source module is configured with a corresponding data acquisition device.

[0092] In addition, in one embodiment, the liquid level meter divides the collected liquid level information into three levels: low liquid level, normal liquid level and high liquid level.

[0093] In this embodiment, the oil tank of each sub-oil source module is divided into a cold oil area and a hot oil area.

[0094] The hot oil zone refers to the area where the hydraulic oil returned by the actuator flows into, also known as the return oil zone; the cold oil zone refers to the area used to extract hydraulic oil to supply the actuator of the hydraulic servo system; the hydraulic oil temperature in the hot oil zone is higher than that in the cold oil zone, and the volume of the hot oil zone is smaller than that of the cold oil zone.

[0095] In order to observe the temperature in the oil tank in real time, the temperature sensor is arranged in the cold oil area of ​​the oil tank.

[0096] In this embodiment, when the oil source (supply) system is not used for a long time or is undergoing regular maintenance, the butterfly valve (located at the pump, high-pressure oil supply pipeline, etc.) will be closed; when the system is started again, the butterfly valve switch signal detection device will detect the switch signal at the butterfly valve and obtain an opening signal to remind the operator to open the butterfly valve that was forgotten to be opened.

[0097] In addition, in one embodiment, an external liquid level gauge is provided on the side wall of the oil tank of each sub-oil source module for visually observing the liquid level height of the hydraulic oil in the oil tank (i.e., the oil height), especially for conveniently observing the amount of oil added when adding new oil to the oil tank.

[0098] In this embodiment, the main controller includes a control cabinet and a PLC in the control cabinet.

[0099] In this embodiment, the sub-controller includes a control box and a PLC in the control box; the control box is arranged on the side wall of the oil tank corresponding to the sub-oil source module.

[0100] In this embodiment, the PLC in the control box includes a CPU, a distributed I / O interface module and an AD interface module;

[0101] The distributed I / O interface module exchanges data with the switch quantity acquisition sensor in the data acquisition device through the backplane bus; the switch quantity acquisition sensor includes a liquid level meter and a butterfly valve switch signal detection device;

[0102] The AD interface module exchanges data with the analog quantity acquisition sensor in the data acquisition device; the analog quantity acquisition sensor includes a temperature sensor;

[0103] The CPU is used to control the operation of the corresponding sub-oil source module according to the operation instructions sent by the main controller; the CPU controls the operation of the corresponding sub-oil source module by sending motor control signals (such as motor start signals), unloading control signals, etc.

[0104] The butterfly valve can be controlled manually. Before oil supply, the butterfly valve is opened manually; after oil supply is completed, the butterfly valve is closed manually.

[0105] In addition, in one embodiment, the butterfly valve can also be controlled by an automatic control system to replace manual operation to automatically open and close the butterfly valve; the automatic control system can be an automatic control system composed of a PLC, a single-chip microcomputer, embedded software or a computer device.

[0106] In this embodiment, the data communication and process control between the main controller and the sub-controller can be configured through configuration software.

[0107] In this embodiment, the PLC in the control box of the sub-controller and the PLC in the control cabinet of the main controller can exchange data through the TCP-IP protocol.

[0108] In this embodiment, the operation instructions sent by the main controller to the sub-controller include start, stop, pressurize and unload operation instructions.

[0109] In this embodiment, the control cabinet of the main controller also includes an operation panel; the operation panel is provided with operation buttons; the operation buttons on the operation panel are used to manually input start, stop, pressurization and unloading operation instructions to perform start, stop, pressurization and unloading operations.

[0110] In addition, in one embodiment, a partition is provided inside the oil tank of each sub-oil source module; the partition is provided between the cold oil zone and the hot oil zone to slow down the interaction speed of the hydraulic oil between the cold oil zone and the hot oil zone.

[0111] In this embodiment, the partition can be added during the welding process of the oil tank.

[0112] In this embodiment, before adding the partition, the oil interaction area between the cold oil zone and the hot oil zone is large, and the oil interaction speed between the cold oil zone and the hot oil zone is too fast. Under the action of the oil in the hot oil zone, the oil temperature in the oil tank will be too high overall for a short time.

[0113] In order to prevent the oil temperature in the oil tank from being too high in a short period of time, a partition is added during the welding process of the oil tank. The partition is welded between the cold oil area and the hot oil area to reduce the oil interaction area between the cold oil area and the hot oil area, thereby slowing down the interaction speed of the oil in the cold and hot areas.

[0114] Additionally, in one embodiment, the sub-oil source module further includes a relief valve;

[0115] The overflow valve is used to return excess hydraulic oil to the oil tank through the overflow valve when the hydraulic oil pressure of the system exceeds the rated pressure, so as to ensure that the hydraulic oil pressure of the system does not exceed the rated pressure.

[0116] In this embodiment, the relief valve is a safety valve of the system, which protects the pressure of the hydraulic oil in the system from exceeding the upper limit of the allowable pressure.

[0117] In this embodiment, before each pump is started, a minimum signal is given to the corresponding relief valve to achieve no-load starting of the pump; after the pump is operating normally, a rated pressure signal is proportionally input to the relief valve.

[0118] In addition, in one embodiment, the sub-oil source module further includes a high-pressure oil filter and a high-pressure oil supply pipeline:

[0119] The high-pressure oil filter is used to filter out impurities in the hydraulic oil supplied to the actuator of the hydraulic servo system;

[0120] The high-pressure oil supply pipeline is used to supply the hydraulic oil after impurities are filtered out by the high-pressure oil filter to the actuator of the hydraulic servo system.

[0121] In this embodiment, the high-pressure oil filter removes impurities from the hydraulic oil extracted by the motor pump assembly to obtain hydraulic oil with a cleanliness level not lower than NAS1638 grade 5, which meets the requirements of the hydraulic servo system;

[0122] The hydraulic oil flowing out of the high-pressure oil filter flows through the high-pressure oil supply line to the actuator of the hydraulic servo system (such as a hydraulic cylinder) to perform servo motion.

[0123] In addition, in one embodiment, the data acquisition device further includes a pressure acquisition sensor for acquiring the pressure of the high-pressure oil supply pipeline.

[0124] The high-pressure oil supply pipeline pressure collected by the pressure collection sensor is an analog quantity. The pressure collection sensor is an analog quantity collection sensor that exchanges data with the AD interface module.

[0125] In addition, in one embodiment, the sub-oil source module further includes a low-pressure oil filter and a low-pressure oil supply pipeline:

[0126] The low-pressure oil filter is used to filter out impurities in the hydraulic oil returned to the oil tank from the actuator of the hydraulic servo system;

[0127] The low-pressure oil supply pipeline is used to deliver the hydraulic oil returned from the actuator of the hydraulic servo system and after impurities are filtered out by the low-pressure oil filter to the oil tank.

[0128] Additionally, in one embodiment, the data acquisition device further comprises an oil filter clogging sensor;

[0129] The oil filter clogging sensor is used to collect clogging information of the high-pressure oil filter and the low-pressure oil filter of each sub-oil source module.

[0130] It should be noted that the oil filter (including high-pressure oil filter and low-pressure oil filter) will be clogged with impurities after long-term use. The oil filter clogging sensor collects clogging information and can further remind the staff to replace the oil filter element in time.

[0131] In this embodiment, the blockage information collected by the oil filter blockage sensor is a switch quantity. The oil filter blockage sensor is a switch quantity acquisition sensor that exchanges data with the distributed I / O interface module via the backplane bus.

[0132] Additionally, in one embodiment, the sub-oil source module further comprises a cooler;

[0133] The device is arranged between the low-pressure oil supply pipeline and the oil tank of the sub-oil source module, and is used to cool the hydraulic oil returned to the oil tank from the actuator of the hydraulic servo system.

[0134] It should be noted that due to the large flow rate and long-term operation of the hydraulic oil, a large amount of heat will be generated in the moving parts such as the motor pump assembly and the hydraulic cylinder piston, causing the hydraulic oil temperature to rise.

[0135] A temperature increase of the hydraulic oil within a certain range can reduce the viscosity of the oil, making it more suitable for the movement needs of the hydraulic servo system; however, a continuous excessive temperature increase of the hydraulic oil will cause the seals in the pipeline to fail, which will lead to a series of problems; therefore, the hydraulic oil needs to be cooled before returning to the tank.

[0136] By arranging a cooler at the end of the low-pressure oil supply line connected to the oil tank, the hydraulic oil is prevented from continuously and excessively increasing in temperature.

[0137] In addition, in one embodiment, the sub-oil source module further includes an air filter:

[0138] The air filter is used to filter the air sucked into the oil tank of the sub-oil source module, and is also used to maintain the pressure in the oil tank balanced with the atmospheric pressure.

[0139] It should be noted that when the hydraulic system is working, the oil level in the tank rises and falls from time to time. When it rises, air is discharged from the inside to the outside, and when it falls, air is sucked in from the outside to the inside. In order to purify the oil in the tank, maintain the pressure inside the tank and the atmospheric pressure balance, and avoid cavitation in the pump, an air filter is installed vertically on the tank cover to filter the inhaled air.

[0140] In addition, in one embodiment, the air filter also serves as an oil filling port for the oil tank of the sub-oil source module.

[0141] When new hydraulic oil is injected into the oil tank, the oil must be filtered before entering the oil tank to filter out the dirt particles in the oil.

[0142] In addition, in one embodiment, the control device further includes a host computer:

[0143] The main controller is used to send the collected operating information of the corresponding sub-oil source module to the main controller;

[0144] The main controller includes an operation mode selection module;

[0145] The operation mode selection module is used to select between two operation modes: local mode and remote mode.

[0146] If the local file operation mode is selected, the main controller sends the operation instruction to the sub-controller;

[0147] If the remote operation mode is selected, the host computer sends operation instructions to the sub-controller via the main controller.

[0148] In this embodiment, the PLC in the control cabinet of the main controller exchanges command data with the host computer through OPC communication.

[0149] In this embodiment, the operation buttons on the operation panel of the control cabinet of the main controller include an operation mode selection button:

[0150] When the operation mode selection button is in the local position, the start, stop, pressurization and unloading operation instructions are manually input through other operation buttons on the operation panel on the control cabinet;

[0151] When the operation mode selection button is placed in the remote position, the start, stop, pressurization and unloading operation instructions are sent through the host computer, more specifically through the host computer software.

[0152] In this embodiment, the host computer further has a display module for displaying the collected temperature information, liquid level information, high-pressure oil supply pipeline pressure, etc. in real time.

[0153] In addition, in one embodiment, the main controller further includes an alarm module:

[0154] The alarm module includes an oil temperature monitoring alarm submodule, a liquid level detection alarm submodule and a communication monitoring alarm submodule;

[0155] The oil temperature monitoring and alarm submodule is used to alarm when the temperature information collected by the temperature sensor reaches a given temperature threshold;

[0156] The liquid level detection alarm submodule is used to alarm when the liquid level information collected by the liquid level meter reaches a given liquid level threshold;

[0157] The communication monitoring alarm submodule is used to alarm when a communication failure occurs in the control device.

[0158] In this embodiment, the temperature sensor is used to monitor the oil temperature in real time. If the oil temperature is lower than 15°C, the motor cannot be started.

[0159] Given temperature thresholds of 55°C and 60°C:

[0160] When the oil temperature collected by the temperature sensor reaches 55℃, an alarm will be triggered without shutting down the machine;

[0161] When the oil temperature collected by the temperature sensor reaches 60℃, an alarm will be issued and the machine will be shut down.

[0162] In this embodiment, the liquid level meter divides the collected liquid level information into three levels: low liquid level, normal liquid level and high liquid level.

[0163] The given liquid level thresholds are low and high:

[0164] When the liquid level measured by the level gauge is lower than the low level position, an alarm will be triggered and the machine will be shut down.

[0165] When the liquid level measured by the level gauge is higher than the high level, an alarm will be triggered and the machine will be shut down.

[0166] In this embodiment, the communication monitoring alarm submodule is used to monitor whether there is a communication failure between the host computer and the PLC of the main controller, and between the PLC of the main controller and the PLC of the sub-controller, and to promptly alarm if a communication failure occurs.

[0167] Additionally, in one embodiment, the alarm module further includes an oil filter blockage alarm submodule;

[0168] The oil filter blockage alarm submodule is used to issue a filter element blockage alarm based on the blockage information collected by the oil filter blockage sensor, prompting the replacement of the oil filter (including the high-pressure oil filter and the low-pressure oil filter) filter element.

[0169] The oil filter clogging information collected by the oil filter clogging sensor is collected based on the pressure difference on both sides of the oil filter element.

[0170] When the pressure difference on both sides of the filter element of the oil filter (including the high-pressure oil filter and the low-pressure oil filter) reaches 0.35MPa, the oil filter blockage alarm submodule determines that the filter element is blocked, issues an alarm, and prompts to replace the filter element.

[0171] In addition, in one embodiment, the alarm module further includes a system pressure overload protection alarm submodule;

[0172] The system pressure overload protection alarm submodule is used to alarm and shut down when the system pressure is higher than the upper limit or lower than the lower limit.

[0173] In this embodiment, the system pressure is the high-pressure oil supply pipeline pressure, which may also be called the oil source pressure, and is acquired by a pressure acquisition sensor.

[0174] The above further describes the technical solution provided by the present invention in detail through several specific embodiments in order to highlight the advantages and benefits of the technical solution provided by the present invention. However, the several specific embodiments described above are not intended to limit the present invention. Any reasonable changes and improvements to the present invention, reasonable combinations of implementation methods and equivalent replacements based on the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. The oil supply system of the hydraulic servo system is characterized by: The system includes: an oil source supply device, a data acquisition device and a control device; The oil source supply device includes a plurality of sub-oil source modules and a connecting vessel; Each sub-oil source module includes a motor pump assembly, an oil tank and a butterfly valve; the motor pump assembly adopts a redundant design; The motor pump assembly is used to draw hydraulic oil from the oil tank and supply it to the actuators of the hydraulic servo system; The butterfly valve is used as a pipeline switch for supplying hydraulic oil to the actuator of the hydraulic servo system; The oil tank is used to receive the hydraulic oil returned from the actuator of the hydraulic servo system; the oil tanks of the multiple sub-oil source modules are connected through a connecting tube; the connecting tube has a given diameter and is used to make the oil properties of the hydraulic oil in the oil tanks of the multiple sub-oil source modules consistent; The data acquisition device is used to collect the operating information of each sub-oil source module; the data acquisition device includes a liquid level meter, a temperature sensor and a butterfly valve switch signal detection device; The liquid level meter is used to collect the liquid level information of the hydraulic oil in the oil tank of each sub-oil source module; The temperature sensor is used to collect temperature information in the oil tank of each sub-oil source module; The butterfly valve switch signal detection device is used to detect the switch signal at the butterfly valve to obtain the working status information of the butterfly valve; The control device includes a main controller and multiple sub-controllers; the sub-controllers are set in a one-to-one correspondence with each sub-oil source module; The sub-controller is used to collect the operating information of the corresponding sub-oil source module collected by the data collection device; it is also used to send the collected operating information of the corresponding sub-oil source module to the main controller; it is also used to control the operation of the corresponding sub-oil source module according to the operating instructions sent by the main controller; The main controller is used to send operating instructions to the sub-controllers according to the received operating information of each sub-oil source module.

2. The oil source supply system of the hydraulic servo system according to claim 1, characterized in that: A partition is provided inside the oil tank of each sub-oil source module; the partition is provided between the cold oil area and the hot oil area, and is used to slow down the interaction speed of the hydraulic oil between the cold oil area and the hot oil area.

3. The oil source supply system of the hydraulic servo system according to claim 1, characterized in that: The sub-oil source module also includes a relief valve; The overflow valve is used to return excess hydraulic oil to the oil tank through the overflow valve when the hydraulic oil pressure of the system exceeds the rated pressure, so as to ensure that the hydraulic oil pressure of the system does not exceed the rated pressure.

4. The oil source supply system of the hydraulic servo system according to claim 1, characterized in that: The sub-oil source module also includes a high-pressure oil filter and a high-pressure oil supply pipeline: The high-pressure oil filter is used to filter out impurities in the hydraulic oil supplied to the actuator of the hydraulic servo system; The high-pressure oil supply pipeline is used to supply the hydraulic oil after impurities are filtered out by the high-pressure oil filter to the actuator of the hydraulic servo system.

5. The oil source supply system of the hydraulic servo system according to claim 4, characterized in that: The sub-oil source module also includes a low-pressure oil filter and a low-pressure oil supply pipeline: The low-pressure oil filter is used to filter out impurities in the hydraulic oil returned to the oil tank from the actuator of the hydraulic servo system; The low-pressure oil supply pipeline is used to deliver the hydraulic oil returned from the actuator of the hydraulic servo system and after impurities are filtered out by the low-pressure oil filter to the oil tank.

6. The oil source supply system of the hydraulic servo system according to claim 5, characterized in that: The data acquisition device also includes an oil filter clogging sensor; The oil filter clogging sensor is used to collect clogging information of the high-pressure oil filter and the low-pressure oil filter of each sub-oil source module.

7. The oil supply system of the hydraulic servo system according to claim 5, characterized in that: The sub-oil source module also includes a cooler; The device is arranged between the low-pressure oil supply pipeline and the oil tank of the sub-oil source module, and is used to cool the hydraulic oil returned to the oil tank from the actuator of the hydraulic servo system.

8. The oil source supply system of the hydraulic servo system according to claim 1, characterized in that: The sub-oil source module also includes an air filter: The air filter is used to filter the air sucked into the oil tank of the sub-oil source module, and is also used to maintain the pressure in the oil tank balanced with the atmospheric pressure.

9. The oil source supply system of the hydraulic servo system according to claim 1, characterized in that: The control device also includes a host computer: The main controller is used to send the collected operating information of the corresponding sub-oil source module to the main controller; The main controller includes an operation mode selection module; The operation mode selection module is used to select between two operation modes: local mode and remote mode. If the local file operation mode is selected, the main controller sends the operation instruction to the sub-controller; If the remote operation mode is selected, the host computer sends operation instructions to the sub-controller via the main controller.

10. The oil source supply system of the hydraulic servo system according to claim 1, characterized in that: The main controller also includes an alarm module: The alarm module includes an oil temperature monitoring alarm submodule, a liquid level detection alarm submodule and a communication monitoring alarm submodule; The oil temperature monitoring and alarm submodule is used to alarm when the temperature information collected by the temperature sensor reaches a given temperature threshold; The liquid level detection alarm submodule is used to alarm when the liquid level information collected by the liquid level meter reaches a given liquid level threshold; The communication monitoring alarm submodule is used to alarm when a communication failure occurs in the control device.

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