Hydraulic system assembly, hydraulic oil recovery control method thereof and operation machine

Abstract

The invention belongs to the technical field of operation machinery, and provides a hydraulic system assembly, a hydraulic oil recovery control method thereof and operation machinery, the hydraulic system assembly comprises a main hydraulic working system and an auxiliary hydraulic system, and the main hydraulic working system forms a plurality of closed oil way modules under the working condition that an oil way is not communicated; the auxiliary hydraulic system comprises an auxiliary pump, a first reversing valve and a first selection module, a pump oil port of the auxiliary pump is connected with the first reversing valve, a first recovery oil way is arranged between the pump oil port of the auxiliary pump and the oil tank, the first selection module comprises a module outlet and a plurality of module inlets, and the module outlet is connected to an oil suction port of the auxiliary pump; the multiple module inlets are connected to the multiple closed oil way modules in a one-to-one correspondence mode, and the first selection module is used for selectively controlling one module inlet to be communicated with the module outlet. According to the system, oil is discharged by means of the auxiliary pump of the operation machine, the oil discharging speed is high, operation is easy, and pollution caused by the fact that oil is exposed in air can be avoided.

Description

Technical Field

[0001] This invention belongs to the field of construction machinery technology, specifically relating to a hydraulic system assembly and its hydraulic oil recovery control method, and construction machinery. Background Technology

[0002] In addition to the main hydraulic system used for core actions (such as digging and lifting), the hydraulic systems of existing construction machinery also include auxiliary hydraulic systems. The main hydraulic system generally requires regular inspection and maintenance, and some construction machinery involves the disassembly and assembly of external attachments during long-distance transportation or function replacement (such as replacing the bucket and breaker hammer of an excavator). Therefore, before performing hydraulic maintenance or transporting the entire machine, it is necessary to completely drain the oil from the relevant pipelines.

[0003] To facilitate oil drainage, the common practice in the industry is to first shut down the entire machine, then have operators disassemble the corresponding joints according to the pipeline layout, allowing the oil to flow out naturally under its own weight and be collected. After collection, operators determine whether to refill the oil tank or replace it with new oil based on the cleanliness of the oil to make up for the system's oil shortage.

[0004] However, after the entire machine is shut down, since the various control valves (such as directional valves, hydraulic check valves, etc.) are usually in the neutral or closed position, and the oil pump stops working, multiple independent "closed oil circuit modules" are often formed in the complex pipeline network. Both ends or one end of these closed modules are blocked. When the staff tries to drain the oil in this section, the internal pressure will drop rapidly, resulting in slow oil flow and seriously affecting the draining efficiency. In addition, since these modules are scattered in different locations in the hydraulic system assembly, the operators often need to frequently change work points, which not only increases the labor intensity but also makes it easy to miss some parts. Furthermore, the oil comes into direct contact with the air, which can cause contamination. Summary of the Invention

[0005] To address the aforementioned deficiencies or shortcomings, this invention provides a hydraulic system assembly and its hydraulic oil recovery control method, as well as a working machine, aiming to solve the technical problems of slow oil discharge rate, cumbersome operation, and easy oil contamination in the main hydraulic working system of existing working machines when the oil circuit is not connected.

[0006] To achieve the above objectives, the present invention provides a hydraulic system assembly, which includes a main hydraulic working system and an auxiliary hydraulic system. The main hydraulic working system forms multiple closed oil circuit modules when the oil circuit is not connected. The auxiliary hydraulic system includes an auxiliary pump, a first directional valve, and a first selection module. The pump port of the auxiliary pump is connected to the first directional valve. A first recovery oil circuit is also provided between the pump port of the auxiliary pump and the oil tank. A first switching valve is provided on the first recovery oil circuit. The first selection module includes a module outlet and multiple module inlets. The module outlet is connected to the suction port of the auxiliary pump. The multiple module inlets are connected one-to-one to multiple closed oil circuit modules. The first selection module is used to selectively control one of the module inlets to be connected to the module outlet.

[0007] In this embodiment, the auxiliary hydraulic system further includes a second selection module. The module outlet is connected to the suction port of the auxiliary pump through the second selection module. The second selection module is also connected to the oil tank. The second selection module is used to selectively control one of the module outlet and the oil tank to be connected to the suction port of the auxiliary pump.

[0008] In this embodiment, the second selection module is a three-way ball valve or a two-position three-way directional valve.

[0009] In this embodiment, the auxiliary hydraulic system further includes an auxiliary action execution unit, which is connected to the working port side of the first directional valve.

[0010] In this embodiment, the main hydraulic working system includes a main pump. A main pump suction oil circuit is provided between the oil inlet of the main pump and the oil tank. When the main pump stops, the main pump suction oil circuit is one of the closed oil circuit modules of the main hydraulic working system. A second switching valve is provided at one end of the main pump suction oil circuit near the oil tank. One of the module inlets of the first selection module is connected to the main pump suction oil circuit between the second switching valve and the main pump.

[0011] In this embodiment, the main hydraulic working system includes a main valve, which has a return port. A return oil passage is provided between the return port and the oil tank. When the main valve is switched to the shut-off valve position, the return oil passage is one of the closed oil passage modules of the main hydraulic working system. A third switching valve is provided at the end of the return oil passage near the oil tank. One of the module inlets of the first selection module is connected to the return oil passage between the third switching valve and the return port.

[0012] In this embodiment, the first selection module is an electrically controlled directional valve block or a manually controlled directional valve block.

[0013] To achieve the above objectives, the present invention also provides a hydraulic oil recovery control method applied to the above-described hydraulic system assembly, wherein the hydraulic oil recovery control method for the hydraulic system assembly includes: S100: Confirm that the main hydraulic working system is in the oil circuit disconnection condition and the first directional valve is in the shut-off position; S200: Controls the opening of the first switching valve, controls the operation of the auxiliary pump, and controls the module outlet to connect to the module inlet one by one in a preset sequence.

[0014] In this embodiment, during the process of sequentially connecting the module inlets to the module outlets according to a preset sequence, the hydraulic oil recovery control method further includes: S210: The conduction time between the monitoring module output and the current module input; S220: When the conduction duration reaches the set extraction duration corresponding to the current closed oil circuit module, the control module outlet is connected to the inlet of the next module in the preset sequence; Alternatively, during the process of sequentially connecting the module inlets to the module outlets according to a preset sequence, the hydraulic oil recovery control method also includes: S230: Monitors the oil pressure of the closed oil circuit module connected to the currently activated module inlet; S240: When the oil pressure is lower than the set oil pressure, the control module outlet is connected to the inlet of the next module in the preset sequence.

[0015] To achieve the above objectives, the present invention also provides a working machine, wherein the working machine includes the hydraulic system assembly according to the above.

[0016] Through the above technical solutions, the hydraulic system assembly provided by the embodiments of the present invention has the following beneficial effects: This system assembly actively draws oil from the closed-loop oil circuit modules using an auxiliary pump, accelerating the oil discharge rate and significantly saving operation time. Simultaneously, by connecting the first selection module to each closed-loop oil circuit module in the main hydraulic system, oil discharge from each module can be achieved simply by controlling the on / off state of the module's inlet and outlet, eliminating the need for frequent work point relocation and making operation more convenient. Furthermore, this system assembly utilizes the auxiliary pump within the machine's own auxiliary hydraulic system for oil discharge, eliminating the need for an external power source or pipelines. The oil flows only within the machine's internal pipes, preventing oil leakage and contamination, and ensuring the purity of the oil in the tank. Additionally, during oil discharge, the hydraulic oil flows directly back to the tank, maintaining the total hydraulic fluid volume and preventing oil depletion.

[0017] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0018] The accompanying drawings are provided to illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a hydraulic schematic diagram of the hydraulic system assembly according to an embodiment of the present invention; Figure 2 This is a hydraulic schematic diagram of another embodiment of the first selection module in the present invention. Figure 3 This is a hydraulic schematic diagram of another embodiment of the first selection module according to the present invention. Figure 4 This is a control flowchart of one oil discharge scenario of the hydraulic system assembly according to an embodiment of the present invention; Figure 5 This is a flowchart illustrating the method steps of the hydraulic oil recovery control method for the hydraulic system assembly according to an embodiment of the present invention; Figure 6 This is a specific step diagram of step S200 in an embodiment of the present invention; Figure 7 This is another specific step diagram of step S200 in an embodiment of the present invention.

[0019] Explanation of reference numerals in the attached figures 11. Main pump; 12. Main valve; 13. Main actuator; 14. Pump suction main oil circuit; 15. Return oil circuit; 16. Second switching valve; 17. Third switching valve; 21. Auxiliary pump; 22. First directional valve; 23. First selection module; 231. Three-way ball valve; In1, first ball valve inlet; In2, second ball valve inlet; OT, ball valve outlet; 232. Two-position three-way solenoid valve; P1, first oil inlet; P2, second oil inlet; A, solenoid valve working port; 233. Multi-way directional valve assembly; 25. First switching valve; 24. First recovery oil circuit; 3. Second selection module; 4. Oil tank; T, return oil port; 5. Liquid level sensor; 6. Motor. Detailed Implementation

[0020] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0021] The hydraulic system assembly of the present invention will now be described with reference to the accompanying drawings.

[0022] This invention provides a hydraulic system assembly, such as Figure 1 As shown, the hydraulic system assembly includes not only the main hydraulic working system for performing core operational actions (such as controlling boom extension and retraction, controlling bucket digging, and controlling turntable rotation), but also an auxiliary hydraulic system. The auxiliary hydraulic system can take many forms, such as a pilot control system that provides low-pressure control oil for the entire system assembly, a braking and steering system that ensures driving safety, a heat dissipation circulation system that cools down key components, and a ladder deployment and folding drive system for large-scale machinery.

[0023] The main hydraulic system includes a main pump 11, a main valve 12, and a main actuator unit for performing core operating actions. The main pump 11 supplies oil to the main actuator unit, and the main valve 12 is located between the main pump 11 and the main actuator unit and is used to control the direction of movement of the main actuator unit 13. When the main hydraulic system is in a non-connected oil circuit condition, closed oil circuit modules will form at multiple locations. A non-connected oil circuit condition refers to one or more local circuits in the system being disconnected from the pressure source or oil tank 4 due to the state switching of hydraulic components. For example, when the main valve 12 or other types of valves (such as a hydraulically controlled check valve) switch to the shut-off position, or when the pump stops, the system will generate closed oil circuit modules. A closed oil circuit module refers to an oil circuit segment where at least one end is blocked.

[0024] The auxiliary hydraulic system includes an auxiliary pump 21, a first directional valve 22, and a first selection module 23. The pump port of the auxiliary pump 21 is connected to the first directional valve 22, which controls the flow direction of the oil output by the auxiliary pump 21. A first recovery oil passage 24 is also provided between the pump port of the auxiliary pump 21 and the oil tank 4, and a first switching valve 25 is provided on the first recovery oil passage 24.

[0025] When the auxiliary action execution unit in the auxiliary hydraulic system needs to work normally, the oil output by the auxiliary pump 21 can flow to the first directional valve 22 by closing the first switching valve 25. When it is necessary to drain the oil from the closed oil circuit module in the main hydraulic system, the oil output by the auxiliary pump 21 can flow to the oil tank 4 by controlling the opening of the first switching valve 25.

[0026] The first selection module 23 includes a module outlet and multiple module inlets. The module outlet is connected to the oil suction port of the auxiliary pump 21, and the multiple module inlets are connected one-to-one to multiple closed oil circuit modules. The first selection module 23 is used to selectively control one of the module inlets to be connected to the module outlet.

[0027] When the main hydraulic system is in a non-connected oil circuit condition, the auxiliary pump 21 is controlled to work by opening the first switch valve 25. At the same time, the corresponding module inlet and module outlet are connected according to the location of the closed oil circuit module to be drained. The oil in the closed oil circuit module can be forcibly pumped to the oil tank 4 by the auxiliary pump 21.

[0028] In summary, this system assembly actively draws oil from the closed-loop oil circuit modules via the auxiliary pump 21, which accelerates the oil discharge rate of the closed-loop oil circuit modules and greatly saves operating time. Simultaneously, by connecting the first selection module 23 to each closed-loop oil circuit module in the main hydraulic system, oil discharge from each closed-loop oil circuit module can be achieved simply by controlling the on / off state of the module inlet and outlet of the first selection module 23, eliminating the need for frequent work point relocation and making operation more convenient. Furthermore, this system assembly utilizes the auxiliary pump 21 in the auxiliary hydraulic system of the operating machinery for oil discharge, eliminating the need for an external power source and pipelines. The oil flows only within the internal pipelines of the operating machinery, preventing oil leakage into the air that could lead to pollution and fire hazards, and ensuring the purity of the oil in the oil tank 4. Additionally, during oil discharge, the hydraulic oil flows directly back to the oil tank 4, ensuring the total amount of oil in the hydraulic system and preventing oil depletion.

[0029] In this embodiment, the non-connected oil circuit condition includes the main hydraulic system shutdown condition. When the main hydraulic system shuts down, the main pump 11 stops, and the main valve 12 switches to the neutral shut-off position. Wherein, as... Figure 1 As shown, when the main pump 11 stops, one end of the main pump suction oil passage 14 between the main pump 11's suction port and the oil tank 4 is blocked, and the main pump suction oil passage 14 becomes one of the closed oil passage modules of the main hydraulic working system. When the main valve 12 switches to the neutral stop valve position, one end of the return oil passage 15 between the main valve 12's return oil port T and the oil tank 4 is blocked, and the return oil passage 15 becomes another closed oil passage module of the main hydraulic working system.

[0030] The following explanation and illustration of the working principle of the system assembly will be based on the working process of the auxiliary pump 21 draining oil from these two closed oil circuit modules. The oil draining process can be divided into manual control and electric control, depending on the control method of the first selection module 23.

[0031] like Figure 1 As shown, taking the three-way ball valve 231, which is manually controlled by the first selection module 23, as an example, the three-way ball valve 231 has a first ball valve inlet In1, a second ball valve inlet In2, and a ball valve outlet OT. The first ball valve inlet In1 and the second ball valve inlet In2 correspond to multiple module inlets of the first selection module 23, and the ball valve outlet OT corresponds to the module outlet of the first selection module 23. The oil circuit of the first ball valve inlet In1 is connected to the main pump suction oil circuit 14, the oil circuit of the second ball valve inlet In2 is connected to the return oil circuit 15, and the ball valve outlet OT is connected to the pump suction port of the auxiliary pump 21.

[0032] like Figure 4As shown, when it is necessary to drain oil from the main pump suction circuit 14, the three-way ball valve 231 is manually adjusted to the position where the inlet In1 and outlet OT of the first ball valve are connected, and the first switching valve 25 is opened to control the auxiliary pump 21 to run. At this time, the hydraulic oil in the main pump suction circuit 14 will flow back to the oil tank 4 through the inlet In1 of the first ball valve, the outlet OT of the ball valve, the suction port of the auxiliary pump 21, the discharge port of the auxiliary pump 21, and the first switching valve 25 in sequence. Through the active suction of the auxiliary pump 21, the oil in the main pump suction circuit 14 can be quickly discharged.

[0033] When the pump finishes pumping oil from the main oil circuit 14, adjust the three-way ball valve 231 to the position where the inlet In2 of the second ball valve is connected to the outlet OT of the ball valve, so that the auxiliary pump 21 can continue to pump hydraulic oil from the return oil circuit 15.

[0034] After both closed oil circuit modules have completed draining, the auxiliary pump 21 can be stopped and the first switch valve 25 can be closed.

[0035] like Figure 1 As shown, in this embodiment, since one end of the pump suction main oil passage 14 is connected to the oil tank 4, when the auxiliary pump 21 discharges oil from the pump suction main oil passage 14, in order to prevent the oil in the oil tank 4 from flowing back into the pump suction main oil passage 14, a second switching valve 16 can be set at one end of the pump suction main oil passage 14 near the oil tank 4. In other words, the inlet In1 of the first ball valve is connected to the pump suction main oil passage 14 between the second switching valve 16 and the main pump 11.

[0036] Similarly, when the auxiliary pump 21 discharges oil from the return oil passage 15, in order to prevent the oil in the oil tank 4 from flowing back into the return oil passage 15, a third switch valve 17 can be installed at one end of the return oil passage 15 near the oil tank 4. That is, the inlet In2 of the second ball valve is connected to the return oil passage 15 between the third switch valve 17 and the return oil port T.

[0037] like Figure 1 and Figure 2 As shown, taking the first selection module 23 as an example of an electrically controlled two-position three-way solenoid valve 232, the two-position three-way solenoid valve 232 includes a first oil inlet P1, a second oil inlet P2, and a solenoid valve working port A. The oil circuit of the first oil inlet P1 is connected to the main pump suction oil circuit 14, the oil circuit of the second oil inlet P2 is connected to the return oil circuit 15, and the solenoid valve working port A is connected to the pump suction port of the auxiliary pump 21. By sequentially controlling the first oil inlet P1 to be connected to the solenoid valve working port A, and the second oil inlet P2 to be connected to the solenoid valve working port A, the auxiliary pump 21 can sequentially discharge oil to the main pump suction oil circuit 14 and the return oil circuit 15.

[0038] Understandably, when the main hydraulic system stops, more closed oil circuit modules may be formed. Therefore, the first selection module 23 can be either a manual single valve or an electrically controlled single valve with multi-channel switching function, or... Figure 3 As shown, it can also be a multi-way directional valve group 233 formed by multiple small-channel valves connected in parallel. For example, two two-position two-way solenoid valves can be used to replace two-position three-way solenoid valves 232.

[0039] In this embodiment, when the first selection module 23 is an electrically controlled valve block or valve group, in order to realize automatic oil discharge of each closed oil circuit module, the system assembly may further include a controller, which is used to control each module or each valve block.

[0040] like Figure 1 and Figure 4 As shown in this embodiment, a liquid level sensor 5 can also be installed at the oil tank 4. When the auxiliary pump 21 is performing oil suction and discharge operation on the closed oil circuit module, if the liquid level sensor 5 senses that the oil level in the oil tank 4 has reached the critical value, the auxiliary pump 21 can be controlled to stop to stop the oil suction operation.

[0041] In this embodiment, the liquid level sensor 5 can be a float type, capacitive type, photoelectric type, etc.

[0042] like Figure 1 and Figure 4 As shown, in this embodiment, the auxiliary hydraulic system also includes a second selection module 3. The module outlet is connected to the oil suction port of the auxiliary pump 21 through the second selection module 3. The second selection module 3 is also connected to the oil tank 4. The second selection module 3 is used to selectively control one of the module outlet and the oil tank 4 to be connected to the oil suction port of the auxiliary pump 21.

[0043] When the auxiliary pump 21 draws oil from the closed oil circuit module, the second selection module 3 can be switched to a state where the auxiliary pump 21 and the first selection module 23 are connected. When the auxiliary action execution unit in the auxiliary hydraulic system needs to work, the second selection module 3 can be switched to a state where the oil suction port of the auxiliary pump 21 is connected to the oil tank 4. At this time, the auxiliary pump 21 draws oil from the oil tank 4 and pressurizes it to the first directional valve 22. When the auxiliary action execution unit in the auxiliary hydraulic system needs to work, the first switching valve 25 needs to be in the closed state.

[0044] In this embodiment, the second selection module 3 can be a three-way ball valve 231 or a two-position three-way directional valve. Of course, the second selection module 3 can also be the same as the first selection module 23, a manual multi-way single valve or an electrically controlled multi-way single valve with multi-channel switching function, or a multi-way directional valve group 233 formed by multiple single valves with few channels connected in parallel. The single valve here can refer to a ball valve, plug valve, slide valve, multi-way valve, etc.

[0045] In this embodiment, the switching valve can be a butterfly valve, ball valve, directional shut-off valve, etc.

[0046] In this embodiment, the auxiliary pump 21 can be driven by the motor 6 or by the power of the engine.

[0047] To achieve the above objectives, such as Figure 4 and Figure 5 As shown, the present invention also provides a hydraulic oil recovery control method applied to the above-mentioned hydraulic system assembly, wherein the hydraulic oil recovery control method for the hydraulic system assembly includes: S100: Confirm that the main hydraulic working system is in the oil circuit disconnection condition and the first directional valve 22 is in the shut-off position; S200: Controls the first switching valve 25 to open, controls the auxiliary pump 21 to work, and controls the module outlet to connect to the module inlet one by one in a preset sequence.

[0048] Before draining the oil, it is necessary to ensure that the main hydraulic system is in a non-connected oil circuit condition and that the auxiliary action execution unit in the auxiliary hydraulic system is not in operation. After confirmation, by controlling the module outlets to open the module inlets one by one in a preset sequence, the auxiliary pump 21 can drain oil from each closed oil circuit module in an orderly manner.

[0049] like Figure 4 and Figure 6 As shown, in this embodiment, during the process of sequentially connecting the module inlets to the module outlets according to a preset sequence, the hydraulic oil recovery control method further includes: S210: The conduction time between the monitoring module output and the current module input; S220: When the conduction duration reaches the set extraction duration corresponding to the current closed oil circuit module, the control module outlet is connected to the inlet of the next module in the preset sequence.

[0050] When the set time has elapsed for the suction of the current closed oil circuit module, it can be assumed that all the oil in the module has been suctioned out, or even if a small amount of oil remains, it will not affect the disassembly and inspection of the system assembly. At this point, the module outlet can be disconnected from the current module inlet and connected to the inlet of the next module in the preset sequence, thus enabling the suction operation for the next closed oil circuit module. Through the above control, one-button suction control of each closed oil circuit module of the main hydraulic working system can be achieved, which not only simplifies the suction operation but also automates the process, eliminating the need for operator supervision.

[0051] It is understandable that in the actual oil recovery process, the volume of each closed oil circuit module may be different, so the set extraction time for each closed oil circuit module will also be different.

[0052] like Figure 4 and Figure 7 As shown, in this embodiment, in addition to judging the oil suction status in the current closed oil circuit module based on the suction duration, the oil suction status can also be judged based on the oil pressure of the current closed oil circuit module. If the system assembly may also include a detection element for monitoring the oil pressure of each closed oil circuit module, the hydraulic oil recovery control method further includes: S230: Monitors the oil pressure of the closed oil circuit module connected to the currently activated module inlet; S240: When the oil pressure is lower than the set oil pressure, the control module outlet is connected to the inlet of the next module in the preset sequence.

[0053] When the auxiliary pump 21 pumps oil from the current closed oil circuit module, the pressure in the closed oil circuit module will drop significantly. If the pressure of the current closed oil circuit module drops to less than the set pressure, it means that the oil in the previous closed oil circuit module has been pumped out, or even if a small amount of oil remains, it will not affect the disassembly and inspection of the system assembly. At this time, the controller can control the module outlet to connect with the inlet of the next module in the preset sequence, so that the auxiliary pump 21 can automatically perform oil suction operation on the next closed oil circuit module.

[0054] To achieve the above objectives, the present invention also provides a working machine, wherein the working machine includes the hydraulic system assembly described above. Since the working machine adopts all the technical solutions of the above embodiments, it at least possesses the beneficial effects brought by the above embodiments, and will not be repeated here.

[0055] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0056] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0057] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0058] Although embodiments of the present invention have been described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A hydraulic system assembly, characterized in that, The hydraulic system assembly includes: The main hydraulic working system has multiple closed oil circuit modules when the oil circuit is not connected. The auxiliary hydraulic system includes an auxiliary pump (21), a first directional valve (22), and a first selection module (23). The pump port of the auxiliary pump (21) is connected to the first directional valve (22). A first recovery oil circuit (24) is also provided between the pump port of the auxiliary pump (21) and the oil tank (4). A first switching valve (25) is provided on the first recovery oil circuit (24). The first selection module (23) includes a module outlet and multiple module inlets. The module outlet is connected to the suction port of the auxiliary pump (21). The multiple module inlets are connected one-to-one to multiple closed oil circuit modules. The first selection module (23) is used to selectively control one of the module inlets to be connected to the module outlet.

2. The hydraulic system assembly according to claim 1, characterized in that, The auxiliary hydraulic system also includes a second selection module (3), the module outlet of which is connected to the oil inlet of the auxiliary pump (21) through the second selection module (3). The second selection module (3) is also connected to the oil tank (4). The second selection module (3) is used to selectively control one of the module outlet and the oil tank (4) to be connected to the oil inlet of the auxiliary pump (21).

3. The hydraulic system assembly according to claim 2, characterized in that, The second selection module (3) is a three-way ball valve (231) or a two-position three-way directional valve.

4. The hydraulic system assembly according to claim 1, characterized in that, The auxiliary hydraulic system also includes an auxiliary action execution unit, which is connected to the working port side of the first directional valve (22).

5. The hydraulic system assembly according to claim 1, characterized in that, The main hydraulic working system includes a main pump (11), and a pump suction main oil passage (14) is provided between the oil suction port of the main pump (11) and the oil tank (4). When the main pump (11) stops, the pump suction main oil passage (14) is one of the closed oil passage modules of the main hydraulic working system. The pump suction main oil passage (14) is provided with a second switching valve (16) at one end near the oil tank (4), and one of the module inlets of the first selection module (23) is connected to the pump suction main oil passage (14) between the second switching valve (16) and the main pump (11).

6. The hydraulic system assembly according to claim 1, characterized in that, The main hydraulic working system includes a main valve (12), the main valve (12) is provided with a return port (T), and a return oil passage (15) is provided between the return port (T) and the oil tank (4). When the main valve (12) is switched to the shut-off valve position, the return oil passage (15) is one of the closed oil passage modules of the main hydraulic working system. The return oil passage (15) is provided with a third switch valve (17) at one end near the oil tank (4), and one of the module inlets of the first selection module (23) is connected to the return oil passage (15) between the third switch valve (17) and the return oil port (T).

7. The hydraulic system assembly according to any one of claims 1 to 6, characterized in that, The first selection module (23) is an electrically controlled directional valve block or a manually controlled directional valve block.

8. A hydraulic oil recovery control method for a hydraulic system assembly, applied to the hydraulic system assembly according to any one of claims 1 to 7, characterized in that, The hydraulic oil recovery control method includes: Confirm that the main hydraulic working system is in a non-connected oil circuit condition and that the first directional valve (22) is in the shut-off position; The first switching valve (25) is controlled to open, the auxiliary pump (21) is controlled to work, and the module outlet is controlled to connect to the module inlet one by one in a preset sequence.

9. The hydraulic oil recovery control method for a hydraulic system assembly according to claim 8, characterized in that, In the process of controlling the module outlets to sequentially connect the module inlets according to a preset sequence, the hydraulic oil recovery control method further includes: Monitor the conduction duration between the module's output and the current module's input; When the conduction duration reaches the set extraction duration corresponding to the current closed oil circuit module, the module outlet is controlled to be connected to the next module inlet in the preset sequence; Alternatively, during the process of controlling the module outlet to sequentially connect the module inlet according to a preset sequence, the hydraulic oil recovery control method further includes: Monitor the oil pressure of the closed oil circuit module connected to the currently activated module inlet; When the oil pressure is lower than the set oil pressure, the module outlet is connected to the next module inlet in the preset sequence.

10. A type of operating machinery, characterized in that, Includes the hydraulic system assembly according to any one of claims 1 to 7.

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