Hydraulic system with priority function and working machine

Abstract

The utility model belongs to the technical field of mechanical equipment and provides a hydraulic system with priority function and operating machinery, the system comprises a working unit, a priority execution unit and a priority valve, the priority execution unit comprises a first hydraulic driving piece and a first reversing valve, the oil outlet side of the priority valve is provided with a first oil way and a second oil way, the first oil way and the second oil way are connected to the first reversing valve and the working unit respectively, the priority valve is provided with a first valve position and a second valve position, the first valve position is configured to enable the oil inlet side to be communicated with the first oil way, the priority valve is further provided with a first reversing end and a second reversing end, the first reversing end is provided with a reset spring, the first oil way is further provided with a first throttling element, and the second reversing end is provided with a second throttling element. The first reversing end and the second reversing end are connected to the first oil way correspondingly and located on the outlet side and the inlet side of the first throttling element correspondingly. The system not only realizes the priority function, but also can avoid the use of a shuttle valve, thereby reducing the cost of the system.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical equipment, and in particular relates to a hydraulic system with a priority function and an operating machine. Background Art

[0002] Some existing mechanical equipment requires a priority function. For example, rice harvesters typically incorporate a steering priority function into their hydraulic systems to ensure safe and flexible harvesting. This function is typically implemented by using a shuttle valve to draw pressure from the steering cylinder's working oil circuit. This pressure is then directed to the reversing end of a priority valve, which controls the valve's priority oil supply to the steering cylinder. However, shuttle valves are generally expensive on the market, and implementing a priority steering function increases the cost of the harvester's hydraulic control system. Utility Model Content

[0003] In view of the above-mentioned defects or shortcomings, the present invention provides a hydraulic system and operating machinery with a priority function, aiming to solve the technical problem that the priority function of the existing hydraulic system requires the use of a shuttle valve to be realized, resulting in high costs.

[0004] To achieve the above-mentioned objectives, the utility model provides a hydraulic system with a priority function, which includes a working unit, a priority execution unit and a priority valve. The priority execution unit includes a first hydraulic drive and a first reversing valve for controlling the reversing of the first hydraulic drive. The oil inlet side of the priority valve is connected to the system pressure oil circuit, and the oil outlet side is provided with a first oil circuit and a second oil circuit. The first oil circuit and the second oil circuit are respectively connected to the first reversing valve and the working unit. The priority valve is provided with a first valve position and a second valve position. The first valve position is configured so that the oil inlet side is connected to the first oil circuit, and the second valve position is configured so that the oil inlet side is simultaneously connected to the first oil circuit and the second oil circuit. The priority valve is also provided with a first reversing end arranged near the first valve position and a second reversing end arranged near the second valve position. A return spring is also provided on the first reversing end, wherein a first throttling element is also provided in the first oil circuit. The first reversing end and the second reversing end are respectively connected to the first oil circuit and are respectively located at the outlet side and the inlet side of the first throttling element.

[0005] In an embodiment of the present utility model, a first pilot oil circuit is provided between the first reversing end and the first oil circuit, a second throttling element is provided on the first pilot oil circuit, a second pilot oil circuit is provided between the second reversing end and the first oil circuit, and a third throttling element is provided on the second pilot oil circuit.

[0006] In an embodiment of the present utility model, the first hydraulic drive component includes a left-turn cylinder and a right-turn cylinder, the first reversing valve is provided with a first working oil port and a second working oil port, the first working oil port and the second working oil port are respectively connected to the cylinder oil inlet pipelines of the left-turn cylinder and the right-turn cylinder, the first reversing valve is also provided with a mid-position return oil valve position, a left-turn valve position, and a right-turn valve position, the left-turn valve position is configured so that the first working oil port is connected to the first oil circuit and the second working oil port is connected to the return oil circuit, the right-turn valve position is configured so that the second working oil port is connected to the first oil circuit and the first working oil port is connected to the return oil circuit, the mid-position return oil valve position is configured so that the first working oil port and the second working oil port are connected to the return oil circuit.

[0007] In an embodiment of the present utility model, the first reversing valve is also provided with a third working oil port, which is connected to the cylinder oil outlet pipelines of the left-turn cylinder and the right-turn cylinder, and the middle oil return valve position is configured so that the first working oil port, the second working oil port, and the third working oil port are all connected to the return oil circuit.

[0008] In an embodiment of the present utility model, the first reversing valve is also connected to the system pressure oil circuit, the first reversing valve is also provided with a fourth working oil port, the fourth working oil port pipeline is connected to the working unit, and the middle return oil valve position is also configured so that the fourth working oil port is connected to the system pressure oil circuit.

[0009] In an embodiment of the present utility model, the first reversing valve is provided with a reversing control handle for controlling the reversing.

[0010] In an embodiment of the present utility model, the left-turn oil cylinder and the right-turn oil cylinder are provided with a reset elastic member.

[0011] In an embodiment of the present utility model, a safety overflow pipe is provided between the system pressure oil circuit and the return oil circuit, and an overflow valve is provided on the safety overflow pipe.

[0012] In an embodiment of the present invention, the working unit includes an action execution element for executing an action and a reversing working link for performing reversing control.

[0013] To achieve the above-mentioned object, the present invention further provides a working machine, wherein the working machine includes the hydraulic system with priority function as described above.

[0014] Through the above technical solution, the hydraulic system with priority function provided by the embodiment of the utility model has the following beneficial effects:

[0015] Taking the priority steering function as an example, the first hydraulic drive component is a steering cylinder. When the system needs to perform a steering operation, the first oil circuit can be connected to the first hydraulic drive component by operating the first reversing valve. After the first oil circuit is connected to the first hydraulic drive component, oil is supplied to the first hydraulic drive component, and the oil pressure of the first oil circuit will drop instantly. Before this, the priority valve will switch or remain in the first valve position under the action of the reset spring regardless of whether it is in the first valve position or the second valve position. The priority valve in the first valve position will control the system pressure oil circuit to give priority to supplying oil to the first hydraulic drive component, thereby realizing the priority steering function of the system. In summary, the hydraulic system with priority function in the utility model connects the two reversing ends of the priority valve to the first oil circuit and is located on the outlet side and the inlet side of the first throttling element respectively, which not only realizes the priority function of the system, but also avoids the use of shuttle valves, thereby reducing the cost of the system.

[0016] Other features and advantages of the present invention will be described in detail in the subsequent detailed description of the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide an understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 It is a schematic diagram of the principle of a hydraulic system with a priority function according to an embodiment of the present utility model.

[0019] Description of Reference Numerals

[0020] 1. Working unit; 11. Reversing working link; 21. First hydraulic drive component; 211. Left-turn cylinder; 212. Right-turn cylinder; 213. Reset elastic component; 22. First reversing valve; A. First working oil port; B. Second working oil port; C. Third working oil port; D. Fourth working oil port; 221. Reversing control handle; 3. Priority valve; 31. First oil circuit; 311. First throttling element; 32. Second oil circuit; 33. First pilot oil circuit; 331. Second throttling element; 34. Second pilot oil circuit; 341. Third throttling element; 35. Reset spring; 4. System pressure oil circuit; T. Return oil circuit. DETAILED DESCRIPTION

[0021] The following is a detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0022] The hydraulic system with priority function of the present invention will be described below with reference to the accompanying drawings.

[0023] like Figure 1As shown, the utility model provides a hydraulic system with a priority function, including a working unit 1, a priority execution unit and a priority valve 3.

[0024] The working unit 1 is used to drive the machine to perform corresponding actions.

[0025] The priority execution unit is used to drive the machine to execute an action with a higher priority than the working unit 1 . The priority execution unit includes a first hydraulic drive 21 and a first reversing valve 22 for controlling the reversing of the first hydraulic drive 21 .

[0026] Priority valve 3 is located between system pressure oil circuit 4 and the priority actuator unit. System pressure oil circuit 4 is used to supply pressurized oil to working unit 1 and the priority actuator unit. The oil inlet of priority valve 3 is connected to system pressure oil circuit 4, and the oil outlet is provided with a first oil circuit 31 and a second oil circuit 32. First oil circuit 31 and second oil circuit 32 are connected to first reversing valve 22 and working unit 1, respectively.

[0027] In addition, in order to ensure the normal operation of the working unit 1, an action execution working oil circuit independent of the priority valve 3 can be set between the system pressure oil circuit 4 and the working unit 1. The action execution working oil circuit needs to be cut off when the first reversing valve is reversed to ensure priority oil supply to the priority execution unit.

[0028] The priority valve 3 is also provided with a first valve position and a second valve position. The first valve position is configured so that the oil inlet side is connected to the first oil circuit 31 , and the second valve position is configured so that the oil inlet side is connected to the first oil circuit 31 and the second oil circuit 32 at the same time, and throttling conduction is preferably performed between the oil inlet side and the first oil circuit 31 .

[0029] Priority valve 3 also has a first reversing end positioned near the first valve position and a second reversing end positioned near the second valve position. A return spring 35 is mounted on the first reversing end. When the oil pressure difference between the second valve position and the first reversing end is less than a preset value, priority valve 3 switches to the first valve position; otherwise, priority valve 3 switches to the second valve position.

[0030] A first throttling element 311 is also provided on the first oil circuit 31. The first reversing end and the second reversing end are respectively connected to the first oil circuit 31 and are respectively located at the outlet side and the inlet side of the first throttling element 311, so that when the first oil circuit is filled with pressure, the pressure at the first reversing end is always lower than that at the second reversing end.

[0031] Taking the priority steering function as an example, the first hydraulic drive component is the steering cylinder, and the first reversing valve 22 is normally in the neutral cut-off state. When the system needs to perform a steering operation, the first reversing valve 22 is operated to switch the first oil circuit 31 to connect with the first hydraulic drive component 21. After the first oil circuit 31 is connected with the first hydraulic drive component 21, oil flows into the first hydraulic drive component 21, and the oil pressure of the first oil circuit 31 will drop instantly. Previously, regardless of whether the priority valve 3 is in the first valve position or the second valve position, it will switch or remain in the first valve position under the action of the return spring 35 ( Figure 1 (left valve position in the left valve position), the priority valve 3 in the first valve position controls the system pressure oil circuit 4 to preferentially supply oil to the first hydraulic drive element 21, thereby realizing the system's priority steering function. In summary, the hydraulic system with a priority function in the present utility model not only realizes the system's priority function by connecting the two reversing ends of the priority valve 3 to the first oil circuit 31 and positioning them on the outlet and inlet sides of the first throttling element 311, respectively, but also avoids the use of a shuttle valve, thereby reducing system costs.

[0032] It is understandable that the priority function may be other, such as in some vehicles, the priority function may be priority power braking, or in some engineering machinery, the first hydraulic drive component may be a travel motor, and the priority function may be priority traveling.

[0033] like Figure 1 As shown, in the embodiment of the present invention, a first pilot oil circuit 33 is provided between the first reversing end and the first oil circuit 31, and a second throttling element 331 is provided on the first pilot oil circuit 33. A second pilot oil circuit 34 is provided between the second reversing end and the first oil circuit 31, and a third throttling element 341 is provided on the second pilot oil circuit 34. The provision of the second throttling element and the third throttling element 341 reduces the oil pressure at the reversing end of the priority valve 3, preventing the oil pressure of the system pressure oil circuit 4 from directly acting on the reversing end of the priority valve 3, resulting in excessive reversing pressure and damage to the valve core.

[0034] Continuing with the example of priority turning, since turning involves left and right turns, Figure 1 As shown, in an embodiment of the present utility model, the first hydraulic drive component 21 may include a left-turn cylinder 211 and a right-turn cylinder 212, and the first reversing valve 22 is provided with a first working oil port A and a second working oil port B, and the first working oil port A and the second working oil port B are respectively connected to the cylinder oil inlet pipelines of the left-turn cylinder 211 and the right-turn cylinder 212, and the first reversing valve 22 is also provided with a neutral return oil valve position, a left-turn valve position, and a right-turn valve position. The left-turn valve position is configured so that the first working oil port A is connected to the first oil circuit 31 and the second working oil port B is connected to the return oil circuit T, and the right-turn valve position is configured so that the second working oil port B is connected to the first oil circuit 31 and the first working oil port A is connected to the return oil circuit T.

[0035] When the first reversing valve 22 is in the left turn valve position, the first oil circuit 31 is connected to the first working oil port A, and the hydraulic oil of the system pressure oil circuit 4 will enter the cylinder oil inlet of the left turn cylinder 211 through the first oil circuit 31 and the first working oil port A, thereby pushing the piston rod of the left turn cylinder 211 to extend, pushing the axle to turn left.

[0036] When the first reversing valve 22 is in the right turn valve position, the first oil circuit 31 is connected to the second working oil port B, and the hydraulic oil of the system pressure oil circuit 4 will enter the cylinder oil inlet of the right turn cylinder 212 through the first oil circuit 31 and the second working oil port B, thereby pushing the piston rod of the right turn cylinder 212 to extend and push the axle to turn right.

[0037] When the first reversing valve 22 is in the middle oil return valve position, the hydraulic oil entering the left-turn oil cylinder 211 and the right-turn oil cylinder 212 can be returned.

[0038] like Figure 1 As shown, in the embodiment of the present utility model, the first reversing valve 22 is further provided with a third working oil port C, which is connected to the cylinder oil outlet pipelines of the left-turn cylinder 211 and the right-turn cylinder 212. The neutral return valve position is configured so that the first working oil port A, the second working oil port B, and the third working oil port C are all connected to the return oil line T. By providing the third working oil port C, the hydraulic oil entering the left-turn cylinder 211 or the right-turn cylinder 212, as well as the hydraulic oil flowing out of the cylinder oil outlets, can be returned.

[0039] In an embodiment of the present invention, the first hydraulic driving member 21 may also be a double-headed oil cylinder, and the first working oil port A and the second working oil port B are respectively connected to two rod chambers of the double-headed oil cylinder.

[0040] In an embodiment of the present invention, a reset elastic member 213 may be provided in the left-turn oil cylinder 211 and the right-turn oil cylinder 212. The reset elastic member 213 can push the piston rods of the left-turn oil cylinder 211 and the right-turn oil cylinder 212 to reset when the left-turn oil cylinder 211 and the right-turn oil cylinder 212 are depressurized (when the first reversing valve is in the neutral oil return valve position).

[0041] like Figure 1As shown, in an embodiment of the present invention, the first reversing valve 22 is also connected to the system pressure oil circuit 4. The first reversing valve 22 is also provided with a fourth working oil port D. The fourth working oil port D is connected to the working unit 1 through the action execution working oil circuit. The neutral return valve position is also configured to connect the fourth working oil port D with the system pressure oil circuit 4. When the priority execution unit is not operating, the first reversing valve 22 is in the neutral return valve position. At this time, the hydraulic oil in the system pressure oil circuit 4 will be preferentially supplied to the working unit 1 through the fourth working oil port D, ensuring efficient supply of hydraulic oil to the working unit 1. When the priority execution unit needs to operate, the first reversing valve 22 will switch the valve position. At this time, the fourth working oil port D is cut off. Under the action of the first pilot oil circuit 33 and the second pilot oil circuit 34, the priority valve 3 will preferentially supply oil to the first hydraulic drive component 21, realizing the priority function.

[0042] like Figure 1 As shown, in an embodiment of the present invention, the first reversing valve 22 is provided with a reversing control handle 221 for controlling reversing. When the first hydraulic drive component is a reversing cylinder, the reversing control handle 221 can be linked to the steering control element in the cab. The driver can control the steering direction of the priority execution unit by simply operating the corresponding element in the cab.

[0043] like Figure 1 As shown, in the embodiment of the present invention, a safety overflow pipe is provided between the system pressure oil circuit 4 and the return oil circuit T, and a relief valve is provided on the safety overflow pipe. By providing the safety overflow pipe, the system oil pressure safety can be ensured.

[0044] like Figure 1 As shown, in an embodiment of the present invention, the working unit 1 includes an action execution element for executing an action and a reversing working link 11 for reversing control. For example, when the system is applied to a rice harvester, the action execution element may include a rice pulling drive element, a header drive element, a discharge beam drive element, etc.

[0045] In an embodiment of the present invention, the priority valve may be a proportional valve, that is, when the priority valve switches from the second valve position to the first valve position, the opening gradually increases, and the opening of the channel between the oil inlet side and the first oil circuit gradually increases.

[0046] To achieve the above object, the present invention further provides an operating machine, wherein the operating machine includes the hydraulic system with priority function described above. The operating machine may be a rice harvester, a corn harvester, a sugarcane harvester, a tractor, etc.

[0047] The hydraulic system with a priority function of the present invention is described below in conjunction with a specific operation process of a working machine, taking the priority execution unit as an example, and the priority steering unit.

[0048] When both the working unit 1 and the priority steering unit are inoperative, the first reversing valve 22 is in the neutral return position, and the reversing working link 11 is also in the neutral drain state. At this point, the system pressure oil circuit 4 directly releases pressure and returns oil through the fourth working oil port D and the reversing working link 11. The system pressure oil circuit 4 is at low pressure, and the first oil circuit 31 and the first and second reversing ends of the priority valve 3 are also at low pressure. Under the action of the return spring 35, the priority valve 3 is in the first valve position. In the first valve position, the priority valve 3 allows the system pressure oil circuit 4 to preferentially supply oil to the priority steering unit when the machine requires steering.

[0049] When the machine is operating in a straight line, working unit 1 is operative and the priority steering unit is inoperative. The pressure in system pressure oil circuit 4 fluctuates with the load on working unit 1. When working unit 1 is under a uniform load, the oil flow in and out of working unit 1 remains relatively constant, and the oil pressure in system pressure oil circuit 4 fluctuates relatively steadily. The driving force generated by the oil pressure difference between the first reversing end and the second reversing end is insufficient to overcome the return spring 35, causing priority valve 3 to remain in the first position. System pressure oil circuit 4 supplies oil to working unit 1 solely through the actuating working oil circuit. When the load on working unit 1 suddenly increases, the oil pressure in system pressure oil circuit 4 increases suddenly. A large pressure difference between the first reversing end and the second reversing end is generated briefly by the first throttle element 311. This large pressure difference generates sufficient driving force to overcome the return spring 35, causing priority valve 3 to switch to the second position. At this point, system pressure oil circuit 4 supplies oil to working unit 1 through both the actuating working oil circuit and priority valve 3, ensuring sufficient oil flow to working unit 1.

[0050] When the machine needs to turn during operation, the first reversing valve 22 is operated to switch the direction, connecting the first oil circuit 31 with the first hydraulic actuator 21 and shutting off the working oil circuit. Once the first oil circuit 31 is connected to the first hydraulic actuator 21, oil flows into the first hydraulic actuator 21, instantly reducing the oil pressure in the first oil circuit 31. At this point, the priority valve 3, regardless of whether it was previously in the first or second position, will switch to or remain in the first position under the action of the return spring 35. In the first position, the priority valve 3 controls the system pressure oil circuit 4 to prioritize oil supply to the first hydraulic actuator 21, thereby implementing the system's priority steering function.

[0051] In summary, the hydraulic system with priority function in the utility model connects the two reversing ends of the priority valve 3 to the first oil circuit 31 respectively and locates them on the outlet side and the inlet side of the first throttling element 311 respectively, which not only realizes the priority function of the system, but also avoids the use of shuttle valves, reduces the cost of the system, and makes the entire system structure simpler and the steering more sensitive.

[0052] In the description of this utility model, 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 technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0053] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0054] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0055] Although the embodiments of the present invention have been described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A hydraulic system with priority function, characterized in that: The hydraulic system with priority function includes: Work unit (1); A priority execution unit comprises a first hydraulic drive component (21) and a first reversing valve (22) for controlling the reversing of the first hydraulic drive component (21); A priority valve (3), the oil inlet side of which is connected to the system pressure oil circuit (4), and the oil outlet side of which is provided with a first oil circuit (31) and a second oil circuit (32), wherein the first oil circuit (31) and the second oil circuit (32) are respectively connected to the first reversing valve (22) and the working unit (1), and the priority valve (3) is provided with a first valve position and a second valve position, wherein the first valve position is configured such that the oil inlet side is connected to the first oil circuit (31), and the second valve position is configured such that the oil inlet side is simultaneously connected to the first oil circuit (31) and the second oil circuit (32), and the priority valve (3) is further provided with a first reversing end arranged near the first valve position and a second reversing end arranged near the second valve position, and a return spring (35) is further provided on the first reversing end; A first throttling element (311) is further provided on the first oil circuit (31), and the first reversing end and the second reversing end are respectively connected to the first oil circuit (31) through pipelines and are respectively located at the outlet side and the inlet side of the first throttling element (311).

2. The hydraulic system with priority function according to claim 1, characterized in that: A first pilot oil circuit (33) is provided between the first reversing end and the first oil circuit (31), and a second throttling element (331) is provided on the first pilot oil circuit (33); a second pilot oil circuit (34) is provided between the second reversing end and the first oil circuit (31), and a third throttling element (341) is provided on the second pilot oil circuit (34).

3. The hydraulic system with priority function according to claim 1, characterized in that: The first hydraulic drive component (21) includes a left-turn oil cylinder (211) and a right-turn oil cylinder (212); the first reversing valve (22) is provided with a first working oil port (A) and a second working oil port (B); the first working oil port (A) and the second working oil port (B) are respectively connected to the oil cylinder oil inlet pipelines of the left-turn oil cylinder (211) and the right-turn oil cylinder (212); the first reversing valve (22) is further provided with a middle oil return valve position, a left-turn valve position, and a right-turn valve position; the left-turn valve position is configured such that the first working oil port (A) is in communication with the first oil circuit (31) and the second working oil port (B) is in communication with the return oil circuit (T); the right-turn valve position is configured such that the second working oil port (B) is in communication with the first oil circuit (31) and the first working oil port (A) is in communication with the return oil circuit (T); the middle oil return valve position is configured such that the first working oil port (A) and the second working oil port (B) are in communication with the return oil circuit (T).

4. The hydraulic system with priority function according to claim 3, characterized in that: The first reversing valve (22) is further provided with a third working oil port (C), the third working oil port (C) being connected to the oil cylinder oil outlet pipelines of the left-turn oil cylinder (211) and the right-turn oil cylinder (212), and the middle oil return valve position is configured so that the first working oil port (A), the second working oil port (B), and the third working oil port (C) are all in communication with the oil return circuit (T).

5. The hydraulic system with priority function according to claim 4, characterized in that: The first reversing valve (22) is also connected to the system pressure oil circuit (4), and the first reversing valve (22) is also provided with a fourth working oil port (D), the fourth working oil port (D) pipeline is connected to the working unit (1), and the middle oil return valve position is also configured so that the fourth working oil port (D) is in communication with the system pressure oil circuit (4).

6. The hydraulic system with priority function according to claim 3, characterized in that: The first reversing valve (22) is provided with a reversing control handle (221) for controlling the reversing.

7. The hydraulic system with priority function according to claim 3, characterized in that: A resetting elastic member (213) is provided in the left-turn oil cylinder (211) and the right-turn oil cylinder (212).

8. The hydraulic system with priority function according to any one of claims 1 to 7, characterized in that: A safety overflow pipeline is provided between the system pressure oil circuit (4) and the return oil circuit (T), and an overflow valve is provided on the safety overflow pipeline.

9. The hydraulic system with priority function according to any one of claims 1 to 7, characterized in that: The working unit (1) comprises an action execution element for executing an action and a reversing working link (11) for performing reversing control.

10. A working machine, characterized in that: The hydraulic system comprises a hydraulic system with a priority function according to any one of claims 1 to 9.

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