Hydraulic system and electric excavator provided with same

Abstract

The application relates to the technical field of engineering vehicles, and provides a hydraulic system and an electric excavator provided with the same. The hydraulic system of the application is applied to an electric excavator and comprises a first hydraulic circuit, a second hydraulic circuit, a third hydraulic circuit and an energy storage circuit. The first hydraulic circuit, the second hydraulic circuit and the third hydraulic circuit are connected with corresponding executing mechanisms in the electric excavator respectively, and each hydraulic circuit is provided with a corresponding control assembly. The energy storage circuit comprises a first energy storage branch, a second energy storage branch and a third energy storage branch. The first energy storage branch is provided with an energy accumulator and a logic valve and is connected with each hydraulic circuit in parallel. The second energy storage branch is connected between the energy accumulator and an executing mechanism connected with the second hydraulic circuit. The third energy storage branch is connected between the energy accumulator and an executing mechanism connected with the third hydraulic circuit. The hydraulic system of the application can improve energy utilization efficiency and help improve the use quality of the electric excavator.

Description

Technical Field

[0001] This application relates to the field of engineering vehicle technology, and in particular to a hydraulic system and an electric excavator equipped with it. Background Technology

[0002] With the continuous development of new energy technologies, the application of electric excavators in the field of engineering vehicles is gradually becoming more widespread. The working performance of electric excavators is directly related to their hydraulic systems. The hydraulic system drives the excavator's actuators to complete various working actions by transmitting pressure.

[0003] However, the current hydraulic systems of electric excavators have a low utilization rate of the regenerative energy generated during the operation of the actuators, which is not conducive to improving the energy utilization rate of electric excavators and thus not conducive to improving the quality of use of electric excavators. Utility Model Content

[0004] In view of this, this application aims to provide a hydraulic system to improve the usability of electric excavators.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows: A hydraulic system for use in an electric excavator includes a first hydraulic circuit, a second hydraulic circuit, a third hydraulic circuit, and an energy storage circuit. The first hydraulic circuit, the second hydraulic circuit, and the third hydraulic circuit are respectively connected to the corresponding actuators in the electric excavator, and each of the first hydraulic circuit, the second hydraulic circuit, and the third hydraulic circuit is equipped with a corresponding control component; The energy storage circuit includes a first energy storage branch, a second energy storage branch, and a third energy storage branch. The first energy storage branch is equipped with an accumulator and a logic valve. The first energy storage branch is connected in parallel with the first hydraulic circuit, the second hydraulic circuit, and the third hydraulic circuit. The second energy storage branch is connected between the accumulator and the actuator connected to the second hydraulic circuit. The third energy storage branch is connected between the accumulator and the actuator connected to the third hydraulic circuit.

[0006] Furthermore, the control component includes a first hydraulic control valve disposed on the first hydraulic circuit, a second hydraulic control valve disposed on the second hydraulic circuit, and a third hydraulic control valve disposed on the third hydraulic circuit.

[0007] Furthermore, the first hydraulic circuit, the second hydraulic circuit, and the third hydraulic circuit are each equipped with a corresponding oil supply pump.

[0008] Furthermore, it also includes a pilot circuit; the control components of the first hydraulic circuit, the second hydraulic circuit, and the third hydraulic circuit are all connected to the pilot circuit.

[0009] Furthermore, it also includes a pilot circuit; the control components of the first hydraulic circuit, the second hydraulic circuit, and the third hydraulic circuit are all connected to the fourth hydraulic control valve.

[0010] Furthermore, it also includes a control unit; the control unit is configured to control the corresponding control components in the first hydraulic circuit, the second hydraulic circuit and the third hydraulic circuit, as well as the on / off state and flow rate of the logic valves.

[0011] Furthermore, the actuator connected to the first hydraulic circuit is used to control the walking motion of the electric excavator; the actuator connected to the second hydraulic circuit is used to control the slewing motion of the electric excavator; and the actuator connected to the third hydraulic circuit is used to control the digging arm motion of the electric excavator.

[0012] Compared with related technologies, this application has the following advantages: (1) The hydraulic system described in this application connects different actuators by setting up a first hydraulic circuit, a second hydraulic circuit and a third hydraulic circuit respectively. By setting up an accumulator and a logic valve on the energy storage circuit, it can recover the regenerative energy generated during the operation of the actuator, reduce energy waste, improve the energy utilization rate of the excavator, and achieve unified energy storage and distribution by connecting the first energy storage circuit in parallel with each circuit and combining the setting of the logic valve. This optimizes the energy recovery efficiency and helps to ensure the coordinated working state of the energy storage circuit and each hydraulic circuit, ensuring the safety and controllability of the hydraulic system operation, and thus helping to improve the quality of use of the electric excavator.

[0013] (2) By setting up corresponding hydraulic control valves on the corresponding hydraulic circuits, independent control of each circuit can be achieved, and it is helpful to make corresponding hydraulic adjustments according to the hydraulic requirements of different actuators. At the same time, it can avoid mutual interference when different actuators are in motion, which helps to improve the accuracy of actuator motion control and facilitates design and implementation.

[0014] (3) By setting up corresponding oil supply pumps on each hydraulic circuit, the hydraulic oil of each circuit can have its own power source, avoiding fluctuations caused by load changes when a single oil pump supplies oil, reducing mutual interference between circuits, and ensuring that each circuit has stable hydraulic power when supplying oil, which helps to improve the accuracy of the actuator's motion control and facilitates the design and implementation.

[0015] (4) By setting up the pilot circuit, it is easier to control each hydraulic circuit, improves the ease of operation, and facilitates design and implementation.

[0016] (5) By setting the fourth hydraulic control valve, it is convenient to control the on / off state and flow of the pilot oil circuit, which helps to indirectly control the oil supply status of each hydraulic circuit and facilitates design and implementation.

[0017] (6) By setting the control unit, it is convenient to set the action parameters of each actuator and execute the corresponding actions of the electric excavator through the preset configuration, thereby improving work efficiency and facilitating design and implementation.

[0018] (7) By connecting the corresponding actuators connected to each circuit, the excavator’s walking, slewing and digging arm movements can be controlled respectively, which helps to achieve targeted design and facilitates matching the actions controlled by different actuators, thereby optimizing energy recovery and power output, and thus helping to implement the design.

[0019] This application also proposes an electric excavator, which is equipped with the hydraulic system described above.

[0020] The electric excavator described in this application is equipped with the hydraulic system as described above, which has the same beneficial effects as the existing hydraulic system as described above, so it will not be described again here. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the hydraulic system described in the embodiments of this application; Explanation of reference numerals in the attached figures: 1. First hydraulic circuit; 2. Second hydraulic circuit; 3. Third hydraulic circuit; 4. Energy storage circuit; 401. First energy storage branch; 402. Second energy storage branch; 403. Third energy storage branch; 5. Accumulator; 6. Logic valve; 7. Actuator; 8. Hydraulic oil tank; 9. First hydraulic control valve; 10. Second hydraulic control valve; 11. Third hydraulic control valve; 12. Oil supply pump; 13. Pilot circuit; 14. Fourth hydraulic control valve; 15. Control unit. Detailed Implementation

[0022] To make the technical solution and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0024] Furthermore, it should be noted that in the description of this application, if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, these are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation on this application. In addition, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] Furthermore, in the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application in light of the specific circumstances.

[0026] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0027] The present application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0028] An embodiment of the first aspect of this application provides a hydraulic system applied in an electric excavator, mainly used to drive the actuator of the electric excavator. The hydraulic system in this embodiment, through its innovative structural design, can recover and utilize renewable energy during the operation of the electric excavator, thereby improving the energy recovery and utilization rate of the electric excavator and helping to improve the quality of use of the electric excavator.

[0029] In related technologies, electric excavators use hydraulic systems to complete their walking, slewing, and boom movements. Traditional hydraulic systems have a low rate of recovery and utilization of regenerative energy generated during the operation of actuators. For example, the slewing mechanism generates a large amount of braking energy when braking and decelerating, and the boom releases gravitational potential energy when descending under gravity. This energy is usually consumed through methods such as throttling by relief valves or cooling by the oil tank.

[0030] This results in a low energy recovery rate for electric excavators, increases motor power consumption and battery endurance pressure, and generates excess heat due to energy dissipation, accelerating hydraulic oil aging and hydraulic component wear, reducing the reliability and service life of the hydraulic system, further reducing the energy recovery rate of the hydraulic system, and hindering the improvement of the performance of electric excavators.

[0031] In view of this, in order to overcome the shortcomings of related technologies, the hydraulic system of this embodiment combines... Figure 1 As shown, the overall design includes a first hydraulic circuit 1, a second hydraulic circuit 2, a third hydraulic circuit 3, and an energy storage circuit 4.

[0032] The first hydraulic circuit 1, the second hydraulic circuit 2, and the third hydraulic circuit 3 are respectively connected to the corresponding actuators 7 in the electric excavator, and each of the first hydraulic circuit 1, the second hydraulic circuit 2, and the third hydraulic circuit 3 is equipped with a corresponding control component.

[0033] The energy storage circuit 4 includes a first energy storage branch 401, a second energy storage branch 402, and a third energy storage branch 403. The first energy storage branch 401 is equipped with an accumulator 5 and a logic valve 6. The first energy storage branch 401 is connected to the first hydraulic circuit 1, the second hydraulic circuit 2, and the third hydraulic circuit 3. The second energy storage branch 402 is connected between the accumulator 5 and the actuator 7 connected to the second hydraulic circuit 2. The third energy storage branch 403 is connected between the accumulator 5 and the actuator 7 connected to the third hydraulic circuit 3.

[0034] Therefore, by setting up a first hydraulic circuit 1, a second hydraulic circuit 2, and a third hydraulic circuit 3 to connect different actuators 7 respectively, and by setting up an accumulator 5 and a logic valve 6 on the energy storage circuit 4, the regenerative energy generated during the operation of the actuators 7 can be recovered, reducing energy waste and improving the energy utilization rate of the excavator. Furthermore, by connecting the first energy storage circuit 4 in parallel with each circuit and combining it with the logic valve 6, unified energy storage and distribution can be achieved, optimizing energy recovery efficiency. This also helps to ensure the coordinated working state of the energy storage circuit 4 and each hydraulic circuit, ensuring the safety and controllability of the hydraulic system operation, and thus improving the quality of use of the electric excavator.

[0035] Based on the above general introduction, specifically, for the hydraulic system in this embodiment, as an exemplary implementation, it typically also includes a hydraulic oil tank 8.

[0036] The hydraulic oil tank 8 described above, as an oil storage component in the overall hydraulic system, generally has an internal cavity in which hydraulic oil is stored. The hydraulic oil tank 8 is equipped with corresponding inlet and outlet ports for each circuit's inlet and outlet. The inlet port corresponds to the return port of each circuit, and the outlet port corresponds to the inlet port of each circuit. The specific structural form of the hydraulic oil tank 8 can be referenced from the specific structural form of the hydraulic oil tank 8 in existing hydraulic systems, and will not be elaborated further here.

[0037] The accumulator 5 installed on the energy storage circuit 4 in the above hydraulic system is usually composed of components such as a housing, bladder, or piston. The specific structural configuration of the accumulator 5 can also be referenced from the specific structural configuration of the accumulator 5 in existing hydraulic systems, and will not be described in detail here. Similarly, the logic valve 6 in the above hydraulic system can also be referenced from the logic valve 6 in existing hydraulic systems, and will not be described in detail here either.

[0038] The specific piping configuration and location of the first hydraulic circuit 1, the second hydraulic circuit 2, and the third hydraulic circuit 3 in the above hydraulic system when connected to the corresponding actuators 7 in the electric excavator can be referenced from the piping configuration and location of the hydraulic circuits of the actuators 7 in existing electric excavators, and will not be elaborated here.

[0039] Continue to combine Figure 1 As shown, in some exemplary embodiments, this embodiment may, for example, include a control component comprising a first hydraulic control valve 9 disposed on a first hydraulic circuit 1, a second hydraulic control valve 10 disposed on a second hydraulic circuit 2, and a third hydraulic control valve 11 disposed on a third hydraulic circuit 3.

[0040] It is understandable that by setting corresponding hydraulic control valves on the corresponding hydraulic circuits, independent control of each circuit can be achieved, and it is helpful to make corresponding hydraulic adjustments according to the hydraulic requirements of different actuators 7. At the same time, it can avoid mutual interference when different actuators 7 are in operation, which helps to improve the accuracy of the control of the actuator 7, and thus helps in design and implementation.

[0041] In specific implementation, the first hydraulic control valve 9 is located upstream of the actuator 7 corresponding to the first hydraulic circuit 1, the second hydraulic control valve 10 is located upstream of the actuator 7 corresponding to the second hydraulic circuit 2, and the third hydraulic control valve 11 is located upstream of the actuator 7 corresponding to the third hydraulic circuit 3.

[0042] It is worth noting that the first hydraulic control valve 9, the second hydraulic control valve 10, and the third hydraulic control valve 11 can all be referenced from the control valves in the hydraulic systems of existing electric excavators. When selecting them, they can be matched according to the hydraulic requirements of the corresponding actuator 7. They only need to meet the flow control requirements of the corresponding hydraulic circuit. In this way, the energy utilization rate of the hydraulic system can be further optimized. By reducing the energy requirements of each hydraulic control valve, the energy requirements of the overall hydraulic system can be reduced.

[0043] Continue to combine Figure 1 As shown, in some exemplary embodiments, this embodiment may, for example, provide a corresponding oil supply pump 12 on the first hydraulic circuit 1, the second hydraulic circuit 2, and the third hydraulic circuit 3.

[0044] It is understandable that by setting up corresponding oil supply pumps 12 on each hydraulic circuit, the hydraulic oil of each circuit can have its own power source, avoiding fluctuations caused by load changes when a single oil pump supplies oil, reducing mutual interference between circuits, and ensuring that each circuit has stable hydraulic power when supplying oil, which helps to improve the accuracy of the action control of the actuator 7, and thus helps in the design and implementation.

[0045] In practical implementation, each oil supply pump 12 can be installed at the oil inlet end of each hydraulic circuit, and each oil supply pump 12 can independently pump oil to each hydraulic circuit based on the hydraulic demand of each circuit. Of course, in addition to the above-mentioned form of installing oil supply pumps 12 on each hydraulic circuit, the same oil pump can also supply oil to each hydraulic circuit at the same time, and the on / off state and flow rate of each hydraulic circuit can be controlled separately by the corresponding control components installed on each hydraulic circuit.

[0046] It should be noted that corresponding oil supply pumps 12 are respectively set on the first hydraulic circuit 1, the second hydraulic circuit 2 and the third hydraulic circuit 3. The power of the oil supply pump 12 can be selected according to the hydraulic requirements of different actuators 7. Compared with using the same oil pump for oil supply, when the individual power of each oil supply pump 12 is small and each oil supply pump 12 is only used when each actuator 7 performs the corresponding action, the method of setting up an oil supply pump 12 separately can save energy than the method of supplying oil through the same oil pump, and thus help to better reduce the energy consumption of the hydraulic system.

[0047] Continue to combine Figure 1 As shown, in some exemplary embodiments, this embodiment may, for example, include a pilot circuit 13 in the hydraulic circuit.

[0048] The control components of the first hydraulic circuit 1, the second hydraulic circuit 2, and the third hydraulic circuit 3 are all connected to the pilot circuit 13.

[0049] Understandably, the pilot circuit 13 facilitates the control of each hydraulic circuit, improves operational convenience, and is conducive to design and implementation.

[0050] In specific implementation, the specific setting of the above pilot circuit 13 can be referenced from the setting of the pilot circuit 13 in the hydraulic system of existing electric excavators. The pilot circuit 13 connects the control components of each hydraulic circuit, which facilitates the adjustment of the on / off state and flow of each control component. It also helps to control the hydraulic action of each circuit at low pressure through the pilot circuit 13, reducing the difficulty of directly controlling the high-pressure oil of each circuit and improving the ease of operation.

[0051] Continue to combine Figure 1 As shown, in some exemplary embodiments, still taking the hydraulic system including pilot circuit 13 as an example, this embodiment may, for example, provide a fourth hydraulic control valve 14 on pilot circuit 13.

[0052] Understandably, the fourth hydraulic control valve 14 facilitates the control of the on / off state and flow rate of the pilot oil circuit, which in turn helps to indirectly control the oil supply status of each hydraulic circuit, thus facilitating design and implementation.

[0053] In practical implementation, the fourth hydraulic control valve 14 can, for example, be based on the pilot valve in the hydraulic system of an existing electric excavator, which will not be elaborated further here. Furthermore, a pilot oil supply pump 12 is also provided upstream of the fourth hydraulic control valve 14. Since the hydraulic pressure in the pilot circuit 13 is typically low during operation, the inclusion of the pilot oil supply pump 12 facilitates the selection of a low-power oil supply pump 12 to meet the hydraulic demands of the pilot circuit 13, thereby reducing the energy consumption of the pilot circuit 13 and consequently reducing the energy consumption of the hydraulic system.

[0054] In addition, the fourth hydraulic control valve 14 mentioned above can usually be located in the cab to facilitate the driver's control of each hydraulic circuit, reduce the difficulty of controlling each circuit, improve the ease of operation, and help improve the quality of use of the electric excavator.

[0055] Continue to combine Figure 1 As shown, in some exemplary embodiments, this embodiment may, for example, include a hydraulic system further comprising a control unit 15.

[0056] The control unit 15 is configured to control the corresponding control components in the first hydraulic circuit 1, the second hydraulic circuit 2 and the third hydraulic circuit 3, as well as the on / off state and flow rate of the logic valve 6.

[0057] It is understandable that by setting the control unit 15, it is convenient to set the action parameters of each actuator 7, and to execute the corresponding actions of the electric excavator through the preset configuration, thereby improving work efficiency and facilitating design and implementation.

[0058] In practical implementation, the control unit 15 can control the logic valve 6 and the corresponding control components in each hydraulic circuit based on the pre-configured settings. For example, in complex operating conditions, if the corresponding hydraulic circuit is not powerful enough during the restart process after being closed, the control unit 15 can control the logic valve 6 to open and connect the accumulator 5 to the corresponding circuit to replenish energy. After the pressure stabilizes, the logic valve 6 is closed.

[0059] Furthermore, in order to better control the hydraulic system, the control unit 15 can be connected not only to the control components corresponding to each circuit, but also to the oil supply pump 12 in the hydraulic system, so as to directly control the start and stop of the oil supply pump 12, which helps to further optimize the use effect of the hydraulic system.

[0060] Continue to combine Figure 1 As shown, in some exemplary embodiments, this embodiment may, for example, enable the actuator 7 connected to the first hydraulic circuit 1 to control the walking motion of the electric excavator, the actuator 7 connected to the second hydraulic circuit 2 to control the slewing motion of the electric excavator, and the actuator 7 connected to the third hydraulic circuit 3 to control the digging arm motion of the electric excavator.

[0061] Understandably, by using the corresponding actuators 7 connected to each circuit to control the excavator's travel, slewing, and boom movements respectively, it is helpful to achieve targeted design, facilitate matching the actions controlled by different actuators 7, thereby optimizing energy recovery and power output, and thus aiding in design implementation.

[0062] In practical implementation, by controlling the slewing motion of the electric excavator through the actuator 7 connected to the second hydraulic circuit 2, the impact and potential energy during the slewing motion can be absorbed through the second energy storage branch 402. By controlling the digging arm motion of the electric excavator through the actuator 7 connected to the third hydraulic circuit 3, the impact and potential energy during the digging arm motion can be absorbed through the third energy storage branch 403. This improves the effectiveness of the energy storage circuit 4 and facilitates the design and implementation.

[0063] It is worth noting that, regarding the hydraulic system of this embodiment, based on the above exemplary implementations, in specific implementation, as a preferred embodiment, it is still composed of... Figure 1 As shown, it generally includes a first hydraulic circuit 1, a second hydraulic circuit 2, a third hydraulic circuit 3, an energy storage circuit 4, a pilot circuit 13, and a hydraulic oil tank 8.

[0064] The first hydraulic circuit 1 is equipped with a first hydraulic control valve 9, the second hydraulic circuit 2 is equipped with a second hydraulic control valve 10, and the third hydraulic circuit 3 is equipped with a third hydraulic control valve 11. Each of the first hydraulic circuit 1, the second hydraulic circuit 2, and the third hydraulic circuit 3 is equipped with a corresponding oil supply pump 12. The first hydraulic circuit 1, the second hydraulic circuit 2, and the third hydraulic circuit 3 are all connected in parallel to the hydraulic oil tank 8, and their respective oil supply pumps 12 are located at the inlet end of the corresponding hydraulic circuit.

[0065] The first hydraulic circuit 1 is connected to the actuator 7 in the electric excavator for controlling the walking motion, the second hydraulic circuit 2 is connected to the actuator 7 in the electric excavator for controlling the slewing motion, and the third hydraulic circuit 3 is connected to the actuator 7 in the electric excavator for controlling the digging arm motion.

[0066] The energy storage circuit 4 includes a first energy storage branch 401, a second energy storage branch 402, and a third energy storage branch 403. The first energy storage branch 401 is equipped with an accumulator 5 and a logic valve 6, and the first energy storage branch 401 is connected in parallel with the first hydraulic circuit 1, the second hydraulic circuit 2, and the third hydraulic circuit 3. The second energy storage branch 402 is connected between the accumulator 5 and the actuator 7 connected to the second hydraulic circuit 2. The third energy storage branch 403 is connected between the accumulator 5 and the actuator 7 connected to the third hydraulic circuit 3.

[0067] The pilot circuit 13 is equipped with a fourth hydraulic control valve 14 and a pilot oil supply pump 12. The pilot oil supply pump 12 is located at the inlet end of the pilot circuit 13. The fourth hydraulic control valve 14 is connected to the first hydraulic control valve 9, the second hydraulic control valve 10, and the third hydraulic control valve 11. The hydraulic system also includes a control unit 15, which is connected to the oil supply pumps 12 installed in the first hydraulic circuit 1, the second hydraulic circuit 2, and the third hydraulic circuit 3, as well as the logic valve 6.

[0068] In the above preferred embodiments, the specific configuration and arrangement of the first hydraulic circuit 1, the second hydraulic circuit 2, the hydraulic oil tank 8, and the pilot circuit 13 can still be referred to the descriptions in the above exemplary embodiments. Furthermore, in this preferred embodiment, the beneficial effects brought about by the design of the first hydraulic circuit 1, the second hydraulic circuit 2, the hydraulic oil tank 8, and the pilot circuit 13 can also be referred to the descriptions in the above exemplary embodiments.

[0069] Furthermore, in this embodiment, when the hydraulic system is in use, if a single-condition operation is performed, only the oil supply pump 12 of the corresponding hydraulic circuit needs to be turned on, and the corresponding control component needs to be turned on. If a multi-condition operation is performed, after the corresponding actuator 7 completes its operation, the hydraulic circuit may lack power during the process of shutting down and restarting. The control unit 15 can control the logic valve 6 to open and connect the accumulator 5 to the corresponding circuit to replenish energy. After the pressure stabilizes, the logic valve 6 is closed.

[0070] The hydraulic system of this embodiment adopts the above design. By setting up multiple hydraulic circuits to connect different actuators 7, and by setting up the accumulator 5 and the logic valve 6 on the energy storage circuit 4, the regenerative energy generated during the operation of the actuators 7 can be recovered, reducing energy waste and improving the energy utilization rate of the excavator. By connecting the first energy storage circuit 4 in parallel with each circuit and combining it with the setting of the logic valve 6, unified energy storage and distribution can be achieved, optimizing energy recovery efficiency. This also helps to ensure the coordinated working state of the energy storage circuit 4 and each hydraulic circuit, ensuring the safety and controllability of the hydraulic system operation, and thus helping to improve the quality of use of the electric excavator.

[0071] An embodiment of the second aspect of this application provides an electric excavator equipped with the hydraulic system described above.

[0072] In the electric excavator of this embodiment, the hydraulic system described above serves as the drive source for the actuator 7. It is generally connected to the electric excavator's battery system, which drives the hydraulic system's operation. The connection methods between the hydraulic system and the actuator 7, as well as between the hydraulic system and the battery system, can all be referenced from the connection methods of existing electric excavators, and will not be elaborated upon here.

[0073] The electric excavator of this embodiment, through the hydraulic system configuration described above, can control the actions of each actuator 7 separately, reduce the energy consumption of the hydraulic system, improve the energy utilization rate of excavation, ensure the safety and reliability of the hydraulic system operation, and thus help improve the quality of use of the electric excavator.

[0074] The above descriptions are merely some embodiments of this application and are not intended to limit this application. The technical features or structures in the foregoing different embodiments can be arbitrarily combined to form other specific technical solutions as needed. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of the claims of this application.

Claims

1. A hydraulic system applied to an electric excavator, characterized in that: It includes a first hydraulic circuit (1), a second hydraulic circuit (2), a third hydraulic circuit (3), and an energy storage circuit (4); The first hydraulic circuit (1), the second hydraulic circuit (2) and the third hydraulic circuit (3) are respectively connected to the corresponding actuators (7) in the electric excavator, and each of the first hydraulic circuit (1), the second hydraulic circuit (2) and the third hydraulic circuit (3) is provided with a corresponding control component; The energy storage circuit (4) includes a first energy storage branch (401), a second energy storage branch (402), and a third energy storage branch (403). The first energy storage branch (401) is equipped with an accumulator (5) and a logic valve (6). The first energy storage branch (401) is connected in parallel with the first hydraulic circuit (1), the second hydraulic circuit (2), and the third hydraulic circuit (3). The second energy storage branch (402) is connected between the accumulator (5) and the actuator (7) connected to the second hydraulic circuit (2). The third energy storage branch (403) is connected between the accumulator (5) and the actuator (7) connected to the third hydraulic circuit (3).

2. The hydraulic system according to claim 1, characterized in that: The control assembly includes a first hydraulic control valve (9) disposed on the first hydraulic circuit (1), a second hydraulic control valve (10) disposed on the second hydraulic circuit (2), and a third hydraulic control valve (11) disposed on the third hydraulic circuit (3).

3. The hydraulic system according to claim 1, characterized in that: The first hydraulic circuit (1), the second hydraulic circuit (2) and the third hydraulic circuit (3) are respectively equipped with corresponding oil supply pumps (12).

4. The hydraulic system according to claim 1, characterized in that: It also includes the pilot circuit (13); The control components of the first hydraulic circuit (1), the second hydraulic circuit (2) and the third hydraulic circuit (3) are all connected to the pilot circuit (13).

5. The hydraulic system according to claim 4, characterized in that: The pilot circuit (13) is equipped with a fourth hydraulic control valve (14). The control components of the first hydraulic circuit (1), the second hydraulic circuit (2) and the third hydraulic circuit (3) are all connected to the fourth hydraulic control valve (14).

6. The hydraulic system according to any one of claims 1-5, characterized in that: It also includes a control unit (15); The control unit (15) is configured to control the corresponding control components in the first hydraulic circuit (1), the second hydraulic circuit (2) and the third hydraulic circuit (3), as well as the on / off state and flow rate of the logic valve (6).

7. The hydraulic system according to claim 6, characterized in that: The actuator (7), which is connected to the first hydraulic circuit (1), is used to control the walking action of the electric excavator; The actuator (7), which is connected to the second hydraulic circuit (2), is used to control the slewing action of the electric excavator; The actuator (7), which is connected to the third hydraulic circuit (3), is used to control the movement of the digging arm of the electric excavator.

8. An electric excavator, characterized in that: The electric excavator is equipped with a hydraulic system as described in any one of claims 1-7.

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