Synchronous output hydraulic system

Abstract

The utility model provides a synchronous output hydraulic system which comprises a priority valve, a lifting control valve, an output multi-way valve, a lifting oil cylinder and an oil tank, an inlet of the priority valve is connected with a hydraulic oil source, and a first outlet of the priority valve is connected with a valve front connector of the lifting control valve; a valve rear connector of the lifting control valve is connected with the lifting oil cylinder, and an oil return opening of the lifting control valve is connected with the oil tank; and a second outlet of the priority valve is connected with the output multi-way valve. According to the utility model, the priority valve is respectively connected with the lifting control valve and the output multi-way valve, so that when hydraulic oil is sufficient, the lifting control valve and the output multi-way valve can work at the same time, the action of the force position lifter is supported, and the output multi-way valve can output continuous and stable hydraulic oil at the same time; when the pressure and flow of hydraulic oil are small, the hydraulic oil is preferentially provided for the lifting control valve, and it is guaranteed that agricultural machinery can work normally.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic systems for agricultural machinery, in particular to a hydraulic system with synchronous output. Background Art

[0002] At present, in the hydraulic system of agricultural machinery, the lifting control valve and the hydraulic output multi-way valve of the force level lifter are in a series relationship. The hydraulic oil from the hydraulic pump first passes through the hydraulic output multi-way valve. Only when all the joint valves in the hydraulic output multi-way valve are in the middle position and not working, the hydraulic oil can enter the lifting control valve through the hydraulic output multi-way valve to support the action of the force level lifter. When any one of the joint valves in the hydraulic output multi-way valve is in the working position output, the hydraulic oil is cut off and cannot support the action of the force level lifter.

[0003] The limitation of this system is that the lifting control valve and the hydraulic output multi-way valve cannot work at the same time. When it is necessary to lift the implement, each joint valve of the hydraulic output multi-way valve must be in the middle position; when hydraulic output is required, the implement cannot be lifted. Therefore, it is impossible to ensure that the two actuators work at the same time. For example, the air suction seeder is a typical application. The seeder needs a hydraulic output of continuous and stable hydraulic oil. The interruption of the oil source will cause the seeds to leak from the seeder, causing waste; when the seeder sows at the end of the field, the force position lifter needs to be activated to lift the seeder for turning and U-turning. If the lifting control valve and the hydraulic output multi-way valve cannot work at the same time in this process, the seeder will leak seeds at the end of the field. At the same time, if the lifting control valve and the hydraulic output multi-way valve are connected in parallel, since the hydraulic oil will preferentially flow to the branch with smaller load, the lifting control valve will not be able to control the force position lifter normally, resulting in the seeder model being unable to turn and U-turn, and thus unable to operate normally. Utility Model Content

[0004] The technical problem to be solved by the utility model is: how to realize the simultaneous operation of a lifting control valve and a hydraulic output multi-way valve.

[0005] The technical solution of the utility model to solve the above technical problems is as follows:

[0006] The utility model provides a hydraulic system with synchronous output, comprising a priority valve, a lifting control valve, an output multi-way valve, a lifting cylinder, and an oil tank, wherein the inlet of the priority valve is connected to a hydraulic oil source, the first outlet of the priority valve is connected to a front-valve interface of the lifting control valve; the rear-valve interface of the lifting control valve is connected to the lifting cylinder, the oil return port of the lifting control valve is connected to the oil tank; and the second outlet of the priority valve is connected to the output multi-way valve.

[0007] The beneficial effects of the utility model are:

[0008] When the hydraulic oil is sufficient, the lifting control valve and the output multi-way valve can work simultaneously, ensuring that the supporting force lifter can be actuated while the output multi-way valve can output continuous and stable hydraulic oil; when the hydraulic oil pressure and flow rate are small, hydraulic oil is preferentially supplied to the lifting control valve, ensuring that the agricultural machinery can operate normally.

[0009] On the basis of the above technical solution, the present invention can also be improved as follows.

[0010] Furthermore, a priority valve core is provided in the priority valve, the first end of the priority valve core is connected to the front valve interface of the lifting control valve through the first branch oil circuit, and the second end of the priority valve core is connected to the rear valve interface of the lifting control valve through the second branch oil circuit; the second end of the priority valve core is provided with a spring that can push the priority valve core to move.

[0011] It is convenient to stabilize the pressure difference before and after the lift control valve, thereby providing a stable flow to the lift control valve and ensuring the stable operation of the lift cylinder.

[0012] Furthermore, the priority valve core is provided with a first working position and a second working position in sequence from the first end to the second end, and the priority valve core can move the first working position or the second working position to the inlet position of the priority valve when it moves along the elastic force direction of the spring; when the first working position moves to the inlet position of the priority valve, the inlet of the priority valve is connected to the first outlet and the second outlet respectively, and a resistance component is provided between the inlet and the second outlet of the priority valve; when the second working position moves to the inlet position of the priority valve, the inlet of the priority valve is only connected to the first outlet.

[0013] When the priority valve core is working in the first working position, the resistance component makes it easier for the hydraulic oil to flow out from the first outlet of the priority valve, thereby ensuring the reliable operation of the lifting control valve; at the same time, when the inlet pressure of the priority valve is relatively small, the oil pressure at the first outlet cannot overcome the elastic force of the spring, thereby making it easier for the priority valve to supply oil only from the first outlet, thereby avoiding the second outlet affecting the oil supply pressure of the priority valve, thereby ensuring the reliable operation of the lifting control valve.

[0014] Furthermore, a first throttle port is provided between the first branch oil circuit and the first end of the priority valve core, and a second throttle port is provided between the second branch oil circuit and the second end of the priority valve core.

[0015] It is convenient to reduce the oil pressure at both ends of the priority valve core, so that the movement of the priority valve core is stable; at the same time, the elastic force requirement of the spring is reduced, and the manufacturing cost is reduced.

[0016] Furthermore, the second branch oil circuit is also connected to a pressure relief oil circuit, the pressure relief oil circuit is connected to the oil tank, and a pressure relief valve is provided on the pressure relief oil circuit.

[0017] When the oil pressure at the rear port of the lift control valve is too high, the oil pressure can be released through the second branch oil circuit and the pressure relief oil circuit to avoid overpressure damage to the lift cylinder and improve safety.

[0018] Furthermore, a one-way valve is provided on the oil circuit between the rear valve interface of the lifting control valve and the lifting cylinder, and an oil return branch is provided on the oil circuit between the one-way valve and the lifting cylinder, and an oil return valve is provided on the oil return branch.

[0019] When the lifting control valve is in the non-working position, the one-way valve can prevent the oil in the lifting cylinder from leaking back to the oil tank, ensuring that the lifting height is maintained at the same position when the lifting is not in action for a long time; at the same time, when encountering a pressure shock caused by a sudden load change during the lifting process, the one-way valve can prevent the pressure shock from being transmitted to the lifting control valve, hydraulic pump and other components, thereby playing a protective role; in addition, opening the return oil valve can allow the lifting cylinder to return oil to the oil tank, making it easier for the lifting cylinder to return quickly, avoiding the mutual influence between the return oil of the lifting cylinder and the pressure at the second end of the priority valve core, and improving the efficiency of the action execution.

[0020] Furthermore, a regulating valve is also provided on the oil return branch line.

[0021] It is convenient to adjust the oil return speed of the lifting cylinder.

[0022] Furthermore, a lifting valve core is provided in the lifting control valve, and a working position and an oil return position are provided on the lifting valve core. The lifting valve core can move along its own axial direction to move the working position or the oil return position to the position of the front valve interface; when the working position moves to the position of the front valve interface, the front valve interface is connected with the rear valve interface; when the oil return position moves to the position of the front valve interface, the oil return port is connected with the rear valve interface.

[0023] It is easy to control the oil supply or return to the lifting cylinder and is easy to operate.

[0024] Furthermore, the oil return station includes a first oil return station and a second oil return station, the first oil return station is located in the middle of the lifting valve core, and the second oil return station is located at one end of the lifting valve core; one end of the lifting valve core is connected to the oil return valve; when the second oil return station moves to the position of the front valve interface, one end of the lifting valve core pushes the oil return valve to open.

[0025] It is convenient to link the oil return valve with the lifting valve core of the lifting control valve, and the operation is convenient.

[0026] Furthermore, a safety branch is provided on the oil circuit between the one-way valve and the lifting cylinder, the safety branch is connected to the oil tank, and a safety valve is provided on the safety branch.

[0027] When a sudden load occurs on the lifting cylinder, the overpressure oil pressure is released to the oil tank through the safety valve to avoid damage to the lifting cylinder and improve system safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the utility model.

[0029] In the accompanying drawings, the technical features represented by the reference numerals are as follows:

[0030] 1-priority valve; 11-first outlet; 12-second outlet; 13-priority valve core; 14-spring; 15-resistance component; 16-first throttle port; 17-second throttle port; 2-lift control valve; 21-front valve interface; 22-rear valve interface; 23-return oil port; 24-lift valve core; 3-output multi-way valve; 4-lift cylinder; 5-oil tank; 51-safety valve; 6-pressure relief valve; 7-check valve; 8-return oil valve; 9-regulating valve. DETAILED DESCRIPTION

[0031] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0032] This utility model refers to Figure 1 .

[0033] The utility model provides a hydraulic system with synchronous output, comprising a priority valve 1, a lifting control valve 2, an output multi-way valve 3, a lifting cylinder 4, and an oil tank 5, wherein the inlet of the priority valve 1 is connected to a hydraulic oil source, the first outlet 11 of the priority valve 1 is connected to a front valve interface 21 of the lifting control valve 2; the rear valve interface 22 of the lifting control valve 2 is connected to the lifting cylinder 4, the oil return port 23 of the lifting control valve 2 is connected to the oil tank 5; the second outlet 12 of the priority valve 1 is connected to the output multi-way valve 3.

[0034] principle:

[0035] The inlet of the priority valve 1 is connected to a hydraulic oil source such as a hydraulic pump, and the hydraulic oil flows out from the first outlet 11 of the priority valve 1 first, and the excess flow flows out from the second outlet 12 of the priority valve 1. When working, the priority valve 1 supplies oil to the lifting control valve 2 through the first outlet 11 first; when the lifting control valve 2 is in the working position, it supplies oil to the lifting cylinder 4, so that the lifting cylinder 4 extends; when the lifting control valve 2 is in the oil return position, the hydraulic oil in the lifting cylinder 4 flows back to the oil tank 5 (it can flow back through the oil return port 23 of the lifting control valve 2, or it can be set up with an oil return branch, and flow back through the oil return valve 8 and the regulating valve 9 on the oil return branch), the lifting cylinder 4 shortens and returns to the position, and at the same time, the passage between the valve front interface 21 and the valve rear interface 22 of the lifting control valve 2 is cut off, so that the priority valve 1 supplies oil to the output multi-way valve 3 through the second outlet 12. When the hydraulic oil is sufficient, the excess flow of the priority valve 1 is provided to the output multi-way valve 3 through the second outlet 12; thereby ensuring that the output multi-way valve 3 can output continuous and stable hydraulic oil.

[0036] Note: The output multi-way valve 3 is a prior art. Meanwhile, the technical problem solved by the utility model has nothing to do with the structure of the output multi-way valve 3.

[0037] By adopting the utility model, the lifting control valve 2 and the output multi-way valve 3 are respectively connected through the priority valve 1, so that the lifting control valve 2 and the output multi-way valve 3 form an approximately parallel relationship. When the hydraulic oil is sufficient, the lifting control valve 2 and the output multi-way valve 3 can work simultaneously, ensuring that the supporting force position lifter is actuated while the output multi-way valve 3 can output continuous and stable hydraulic oil; when the hydraulic oil pressure and flow rate are small, hydraulic oil is preferentially supplied to the lifting control valve 2, ensuring that the agricultural machinery can operate normally.

[0038] Furthermore, a priority valve core 13 is provided in the priority valve 1, and the first end of the priority valve core 13 is connected to the front valve interface 21 of the lift control valve 2 through a first branch oil circuit, and the second end of the priority valve core 13 is connected to the rear valve interface 22 of the lift control valve 2 through a second branch oil circuit; the second end of the priority valve core 13 is provided with a spring 14 that can push the priority valve core 13 to move.

[0039] Note: Both ends of the priority valve core 13 are provided with hydraulic chambers, and the first branch oil circuit and the second branch oil circuit are connected to the corresponding hydraulic chambers. When the first outlet 11 of the priority valve 1 passes through the hydraulic oil, the hydraulic oil enters the first end of the priority valve core 13 through the first branch oil circuit, thereby pushing the priority valve core 13 to overcome the force of the spring 14 and move to the first working position. When the valve rear interface 22 of the lifting control valve 2 passes through the hydraulic oil, the valve rear oil pressure of the lifting control valve 2 is guided to the second end of the priority valve core 13 through the second branch oil circuit. At this time, the pressure at the first end of the priority valve core 13 minus the pressure at the second end is equal to the elastic force of the spring 14, and is also equal to the pressure at the valve front interface 21 of the lifting control valve 2 minus the pressure at the valve rear interface 22, that is, the pressure difference between the valve front and valve rear of the lifting control valve 2 is equal to the elastic force of the spring 14, which is equal to a constant. The flow of the lifting control valve 2 is only related to the pressure difference between the valve front and valve rear and the valve opening, so that a stable flow can be provided to the lifting control valve 2; the excess flow is provided to the output multi-way valve 3 through the second outlet 12 of the priority valve 1. When the lift control valve 2 is in the oil return position, the hydraulic oil at the second end of the priority valve core 13 returns to the oil tank 5 through the second branch oil circuit and the lift control valve 2 .

[0040] It is convenient to stabilize the pressure difference before and after the lift control valve 2, thereby providing a stable flow to the lift control valve 2 and ensuring the stable operation of the lift cylinder 4.

[0041] Furthermore, the priority valve core 13 is provided with a first working position and a second working position in sequence from the first end to the second end, and the priority valve core 13 moves along the elastic force direction of the spring 14 to enable the first working position or the second working position to move to the inlet position of the priority valve 1; when the first working position moves to the inlet position of the priority valve 1, the inlet of the priority valve 1 is connected to the first outlet 11 and the second outlet 12 respectively, and a resistance component 15 is provided between the inlet of the priority valve 1 and the second outlet 12; when the second working position moves to the inlet position of the priority valve 1, the inlet of the priority valve 1 is only connected to the first outlet 11.

[0042] Note: the resistance component 15 can be a pressure reducing valve, a throttle, etc. The first working position and the second working position are respectively provided with different slot channels. When the first working position moves to the inlet position of the priority valve 1, the hydraulic oil at the inlet of the priority valve 1 flows through the slot channel on the first working position, so that the inlet of the priority valve 1 is connected to the first outlet 11 and the second outlet 12 respectively; when the second working position moves to the inlet position of the priority valve 1, the hydraulic oil at the inlet of the priority valve 1 flows through the slot channel on the second working position, so that the inlet of the priority valve 1 is only connected to the first outlet 11.

[0043] When the priority valve core 13 is working in the first working position, the resistance component 15 makes it easier for the hydraulic oil to flow out from the first outlet 11 of the priority valve 1 first, thereby ensuring the reliable operation of the lifting control valve 2; at the same time, when the inlet pressure of the priority valve 1 is relatively small, the oil pressure of the first outlet 11 cannot overcome the elastic force of the spring 14, thereby making it easier for the priority valve 1 to supply oil only from the first outlet 11, thereby preventing the second outlet 12 from affecting the oil supply pressure of the priority valve 1, thereby ensuring the reliable operation of the lifting control valve 2.

[0044] Furthermore, a first throttle port 16 is provided between the first branch oil circuit and the first end of the priority valve core 13 , and a second throttle port 17 is provided between the second branch oil circuit and the second end of the priority valve core 13 .

[0045] It is convenient to reduce the oil pressure at both ends of the priority valve core 13, so that the movement of the priority valve core 13 is stable; at the same time, the elastic force requirement of the spring 14 is reduced, and the manufacturing cost is reduced.

[0046] Furthermore, the second branch oil circuit is also connected to a pressure relief oil circuit, the pressure relief oil circuit is connected to the oil tank 5 , and a pressure relief valve 6 is provided on the pressure relief oil circuit.

[0047] When the oil pressure of the rear port 22 of the lift control valve 2 is too high, the oil pressure can be relieved through the second branch oil circuit and the pressure relief oil circuit to avoid overpressure damage to the lift cylinder 4 and improve safety.

[0048] Furthermore, a one-way valve 7 is provided on the oil circuit between the rear valve interface 22 of the lifting control valve 2 and the lifting cylinder 4, and an oil return branch is provided on the oil circuit between the one-way valve 7 and the lifting cylinder 4, and an oil return valve 8 is provided on the oil return branch.

[0049] When the lifting control valve 2 is in the non-working position, the one-way valve 7 can prevent the oil in the lifting cylinder 4 from leaking back to the oil tank, thereby ensuring that the lifting height is maintained at the same position when the lifting is not in action for a long time; at the same time, when a pressure shock caused by a sudden load change occurs during the lifting process, the one-way valve 7 can prevent the pressure shock from being transmitted to the lifting control valve 2, the hydraulic pump and other components, thereby playing a protective role; in addition, opening the return oil valve 8 can allow the lifting cylinder 4 to return oil to the oil tank 5, thereby facilitating the lifting cylinder 4 to quickly shorten its return position, thereby avoiding the mutual influence between the return oil of the lifting cylinder 4 and the pressure at the second end of the priority valve core 13, thereby improving the efficiency of the action execution.

[0050] Furthermore, a regulating valve 9 is provided on the oil return branch line.

[0051] It is convenient to adjust the oil return speed of the lifting cylinder 4.

[0052] Furthermore, a lifting valve core 24 is provided in the lifting control valve 2, and a working position and an oil return position are provided on the lifting valve core 24. The lifting valve core 24 can move along its own axial direction to move the working position or the oil return position to the position of the front valve interface 21; when the working position moves to the position of the front valve interface 21, the front valve interface 21 is connected with the rear valve interface 22; when the oil return position moves to the position of the front valve interface 21, the oil return port 23 is connected with the rear valve interface 22.

[0053] Note: The working station and the oil return station are provided with different groove channels. When the working station moves to the position of the valve front interface 21, the valve front interface 21 is connected with the valve rear interface 22 through the groove channel of the working station; when the oil return station moves to the position of the valve front interface 21, the oil return port 23 is connected with the valve rear interface 22 through the groove channel of the oil return station.

[0054] It is convenient to control the oil supply or oil return to the lifting cylinder 4, and the operation is convenient.

[0055] Furthermore, the oil return station includes a first oil return station and a second oil return station, the first oil return station is located in the middle of the lift valve core 24, and the second oil return station is located at one end of the lift valve core 24; one end of the lift valve core 24 is connected to the oil return valve 8; when the second oil return station moves to the position of the front-valve interface 21, one end of the lift valve core 24 pushes the oil return valve 8 to open.

[0056] Note: One end of the lifting valve core 24 can be connected to one end of the valve core of the oil return valve 8 through a connecting rod structure. When the lifting valve core 24 moves, it can push the connecting rod structure to move. The connecting rod structure can transmit the movement to the valve core of the oil return valve 8, driving the valve core of the oil return valve 8 to move in the same direction, thereby pushing the oil return valve 8 to open or close, realizing a longer distance linkage.

[0057] It is convenient to link the oil return valve 8 with the lifting valve core 24 of the lifting control valve 2, and the operation is convenient.

[0058] Furthermore, a safety branch is provided on the oil circuit between the one-way valve 7 and the lifting cylinder 4 , the safety branch is connected to the oil tank 5 , and a safety valve 51 is provided on the safety branch.

[0059] When the lifting cylinder 4 generates a sudden load, the overpressure oil pressure is released to the oil tank 5 through the safety valve 51, thereby avoiding damage to the lifting cylinder 4 and improving the safety of the system.

[0060] In the description of the present invention, it should be understood that if there are descriptive terms indicating orientation, direction or positional relationship, such as: "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated in this specification is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of understanding the present invention and simplifying the description, and does not indicate or imply that the referred part, element or whole must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0061] In addition, if there are order description terms, such as "first", "second", etc., their purpose in this specification is to facilitate understanding or simplify description. For example, in order to distinguish multiple technical features of the same type or function, but they have to be mentioned separately, this specification may use prefix or suffix order description terms to distinguish them. Therefore, it cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0062] In the present utility model, if the terms describing the relative functional relationship of the structures are used, such as "install", "connect", "connect", "fix", etc., they should be understood in a broad sense unless otherwise clearly specified and limited. For example, "install", "connect", "connect", etc. can be a fixed connection, a detachable connection, or an integrated one; can be a mechanical connection or an electrical connection; can be a direct connection or an indirect connection through an intermediate medium, can be the internal connection of two elements or the interaction relationship between two elements; "fix" can be an integrated fixation or a detachable fixation through fasteners; can be a direct fixation or a fixation through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above-mentioned descriptive terms in the present utility model can be understood according to the specific circumstances, the context, the coherence of the context, etc.

[0063] In the present invention, if there are descriptive terms with subsidiary or connecting meanings, for example, a first feature is "on" or "below" a second feature, unless otherwise clearly specified and limited, it should not be understood in a restrictive manner. For example, "on" or "below" may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above descriptive terms in the present invention can be understood according to the specific circumstances, the context, the coherence of the context, etc.

[0064] Furthermore, the first feature being “above”, “above”, and “above” the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being “below”, “below”, and “below” the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0065] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. 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 utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine the different embodiments, examples and features of the different embodiments and examples described in this specification without contradiction, and these combinations or combinations shall all fall within the scope summarized by the utility model.

[0066] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are illustrative and cannot be construed as limitations on the present invention. A person skilled in the art can change, modify, replace and modify the above embodiments within the scope of information available from public channels and in combination with the technical inspiration provided by the present application documents.

Claims

1. A hydraulic system with synchronous output, characterized in that: The invention comprises a priority valve (1), a lifting control valve (2), an output multi-way valve (3), a lifting cylinder (4), and an oil tank (5); the inlet of the priority valve (1) is connected to a hydraulic oil source; the first outlet (11) of the priority valve (1) is connected to a front valve interface (21) of the lifting control valve (2); the rear valve interface (22) of the lifting control valve (2) is connected to the lifting cylinder (4); the oil return port (23) of the lifting control valve (2) is connected to the oil tank (5); and the second outlet (12) of the priority valve (1) is connected to the output multi-way valve (3).

2. The synchronous output hydraulic system according to claim 1, characterized in that: The priority valve (1) is provided with a priority valve core (13), the first end of the priority valve core (13) is connected to a valve front interface (21) of a lift control valve (2) via a first branch oil circuit, and the second end of the priority valve core (13) is connected to a valve rear interface (22) of the lift control valve (2) via a second branch oil circuit; the second end of the priority valve core (13) is provided with a spring (14) capable of pushing the priority valve core (13) to move.

3. The synchronous output hydraulic system according to claim 2, characterized in that: The priority valve core (13) is provided with a first working position and a second working position in sequence from the first end to the second end. The priority valve core (13) moves in the direction of the elastic force of the spring (14) so ​​that the first working position or the second working position moves to the inlet position of the priority valve (1); when the first working position moves to the inlet position of the priority valve (1), the inlet of the priority valve (1) is connected to the first outlet (11) and the second outlet (12), respectively, and a resistance component (15) is provided between the inlet of the priority valve (1) and the second outlet (12); when the second working position moves to the inlet position of the priority valve (1), the inlet of the priority valve (1) is only connected to the first outlet (11).

4. The synchronous output hydraulic system according to claim 2, characterized in that: A first throttle opening (16) is provided between the first branch oil circuit and the first end of the priority valve core (13), and a second throttle opening (17) is provided between the second branch oil circuit and the second end of the priority valve core (13).

5. The synchronous output hydraulic system according to claim 4, characterized in that: The second branch oil circuit is also connected to a pressure relief oil circuit, the pressure relief oil circuit is connected to the oil tank (5), and a pressure relief valve (6) is provided on the pressure relief oil circuit.

6. The synchronous output hydraulic system according to claim 2, characterized in that: A one-way valve (7) is also provided on the oil circuit between the rear valve interface (22) of the lifting control valve (2) and the lifting cylinder (4), and an oil return branch is also provided on the oil circuit between the one-way valve (7) and the lifting cylinder (4), and an oil return valve (8) is provided on the oil return branch.

7. The synchronous output hydraulic system according to claim 6, characterized in that: The oil return branch line is also provided with a regulating valve (9).

8. The synchronous output hydraulic system according to claim 6, characterized in that: The lifting control valve (2) is provided with a lifting valve core (24), and a working position and an oil return position are provided on the lifting valve core (24). The lifting valve core (24) can move along its own axial direction to move the working position or the oil return position to the position of the valve front interface (21); when the working position moves to the position of the valve front interface (21), the valve front interface (21) is communicated with the valve rear interface (22); when the oil return position moves to the position of the valve front interface (21), the oil return port (23) is communicated with the valve rear interface (22).

9. The synchronous output hydraulic system according to claim 8, characterized in that: The oil return station comprises a first oil return station and a second oil return station, the first oil return station is located in the middle of the lifting valve core (24), and the second oil return station is located at one end of the lifting valve core (24); one end of the lifting valve core (24) is connected to the oil return valve (8); when the second oil return station moves to the position of the front valve interface (21), one end of the lifting valve core (24) pushes the oil return valve (8) to open.

10. The synchronous output hydraulic system according to claim 6, characterized in that: A safety branch is also provided on the oil circuit between the one-way valve (7) and the lifting oil cylinder (4), the safety branch is connected to the oil tank (5), and a safety valve (51) is provided on the safety branch.

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