A multi-way valve system, hydraulic system and agricultural machine

Abstract

The present application relates to a kind of multi-way valve system, hydraulic system and agricultural machinery, it relates to hydraulic field, the priority valve of multi-way valve system has priority inlet, priority first outlet and priority second outlet, priority valve can adjust the opening and closing and opening degree of priority inlet to priority first outlet and / or priority second outlet, main oil inlet line is communicated with priority inlet, priority first outlet is communicated with second working oil inlet line, priority second outlet is communicated with one end of first working oil inlet line;The oil inlet of first working electromagnetic valve is communicated with second working oil inlet line, the oil inlet of second working electromagnetic valve is communicated with first working oil inlet line, the oil outlet of second working electromagnetic valve and the oil outlet of first working electromagnetic valve are all communicated with working oil return line.The beneficial effects of the present application are: on the basis of meeting the function of two groups of oil cylinder separate action function, composite simultaneous action can be realized, and two groups of oil cylinder action speed can be adjusted distribution.

Description

Technical Field

[0001] This invention relates to the field of hydraulics, specifically to a multi-way valve system, a hydraulic system, and agricultural machinery. Background Technology

[0002] Currently, most wheeled corn harvesters and other agricultural machinery use electromagnetic multi-way valves to control the movement of various cylinders in their hydraulic systems. This electromagnetic multi-way valve generally consists of three parts: an inlet valve, a working valve, and a tail valve. The inlet valve is equipped with a two-position, two-way solenoid valve and a relief valve. The two-position, two-way solenoid valve provides low-pressure unloading when not in operation, while the relief valve provides high-pressure unloading when the system is overloaded. The working valve controls the movement of each cylinder. When both valves are energized simultaneously, controlling both sets of cylinders to move simultaneously, based on the basic principles of hydraulic systems, the cylinder with the lighter load will move first. If this cylinder's entire stroke does not change significantly, it will continue to move to its limit position before the other cylinder moves. If the load on this cylinder exceeds that of the other cylinder during its stroke, this cylinder will stop moving, and the other cylinder will move. Simply put, when controlling two sets of cylinders simultaneously, the cylinder with the lighter load moves, while the cylinder with the heavier load remains stationary; simultaneous movement of both sets of cylinders is not possible.

[0003] As users demand higher functionality from corn harvesters, the need for complex actuation is also growing stronger. Existing solenoid valves and multi-way valves cannot achieve simultaneous operation of different functional cylinders under varying load conditions. Summary of the Invention

[0004] The technical problem to be solved by the present invention is how to achieve the simultaneous operation of different hydraulic cylinders.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a multi-way valve system, including a first working solenoid valve, a main oil inlet pipeline, a priority valve, a second working solenoid valve, a first working oil inlet pipeline, a second working oil inlet pipeline, and a working oil return pipeline;

[0006] The priority valve has a priority inlet, a priority first outlet, and a priority second outlet. The priority valve can adjust the opening and closing of the priority inlet to the priority first outlet and / or the priority second outlet, as well as the opening degree. The main oil inlet pipeline is connected to the priority inlet, the priority first outlet is connected to the second working oil inlet pipeline, and the priority second outlet is connected to one end of the first working oil inlet pipeline.

[0007] The oil inlet of the first working solenoid valve is connected to the second working oil inlet pipeline, the oil inlet of the second working solenoid valve is connected to the first working oil inlet pipeline, and the oil outlets of the second working solenoid valve and the first working solenoid valve are both connected to the working return oil pipeline.

[0008] The beneficial effects of this invention are: by adjusting the opening and closing of the priority inlet to the priority first outlet and / or priority second outlet, the amount of hydraulic oil entering the second working inlet pipeline and / or the first working inlet pipeline is controlled, making the hydraulic oil flow into the first and second working solenoid valves controllable and unaffected by the load. The first and second working solenoid valves are connected to corresponding cylinders to control their actions. This solution, while satisfying the separate action function of two sets of cylinders with different functions, can achieve compound simultaneous action, and the action speed of the two sets of cylinders can be adjusted and distributed. Existing electromagnetic multi-way valves, if they want to achieve compound control action, require modification by adding other multi-way valve groups, resulting in a complex structure and numerous pipeline connections. This solution achieves compound control function through integration, resulting in a compact structure and lower cost.

[0009] Based on the above technical solution, the present invention can be further improved as follows.

[0010] Furthermore, the multi-way valve system also includes an adjustable flow valve. The priority valve includes a valve body, a valve core, and a spring. The valve body has a valve cavity, and the valve core is slidably disposed within the valve cavity. The two ends of the spring abut against one end of the valve cavity and one end of the valve core, respectively. One end of the valve cavity has a first control port, and the other end has a second control port. The first control port is connected to one of the working oil ports of the first working solenoid valve, and the second control port is connected to the priority first outlet. The priority first outlet is connected to the second working oil inlet pipeline through the adjustable flow valve.

[0011] The beneficial effect of adopting the above-mentioned further solution is that the movement of the priority valve core is affected by the combined influence of the oil pressure at the first control port, the oil pressure at the second control port, and the spring force. By adjusting the opening size of the adjustable flow valve, the cylinder action speed corresponding to the first and second working solenoid valves can be adjusted.

[0012] Furthermore, the multi-way valve system also includes a shuttle valve, which has a first inlet, a second inlet, and an outlet. The shuttle valve can be switched to be connected to the first inlet or the second inlet and the outlet. The first inlet and the second inlet are respectively connected to the two working ports of the first working solenoid valve, and the outlet is connected to the first control port.

[0013] The beneficial effect of adopting the above-mentioned further scheme is that the one with higher oil pressure among the two working oil ports of the first working solenoid valve is connected to the first control port through a shuttle valve.

[0014] Furthermore, the multi-way valve system also includes a first relief valve, the inlet of which is connected to the outlet of the shuttle valve, and the outlet of which is connected to the working return oil pipeline.

[0015] The beneficial effect of adopting the above-mentioned further solution is that the first relief valve overflows the excess hydraulic oil from the shuttle valve outlet to the working return oil line.

[0016] Furthermore, the multi-way valve system also includes a second two-position two-way solenoid valve. The second two-position two-way solenoid valve has a first oil port and a second oil port. The second two-position two-way solenoid valve can be switched to connect or disconnect the first oil port and the second oil port. The other end of the first working oil inlet pipeline is connected to the first oil port, and the second oil port is connected to the working oil return pipeline.

[0017] The beneficial effects of adopting the above-mentioned further scheme are: the second two-position two-way solenoid valve is set downstream of the priority valve to perform unloading control, reduce power loss, and save energy.

[0018] Furthermore, the multi-way valve system also includes a main return oil line, and the working return oil line is connected to the main return oil line.

[0019] The beneficial effect of adopting the above-mentioned further solution is that the hydraulic oil in the working return oil line returns to the oil tank through the main return oil line.

[0020] Furthermore, the multi-way valve system also includes a first two-position two-way solenoid valve, which has a third port and a fourth port. The first two-position two-way solenoid valve can be switched to connect or disconnect the third port and the fourth port. The third port is connected to the main oil inlet pipeline, and the fourth port is connected to the main oil return pipeline.

[0021] The beneficial effects of adopting the above-mentioned further scheme are: the first two-position two-way solenoid valve is set upstream of the priority valve to perform unloading control, reduce power loss, and save energy.

[0022] Furthermore, the multi-way valve system also includes a second relief valve, the inlet of which is connected to the main oil inlet line, and the outlet of which is connected to the working return line.

[0023] The beneficial effect of adopting the above-mentioned further solution is that when the oil pressure in the main oil inlet line is too high, the hydraulic oil can overflow to the working return oil line through the second relief valve.

[0024] The present invention also provides a hydraulic system, including the aforementioned multi-way valve system.

[0025] The present invention also provides an agricultural machine, including the aforementioned hydraulic system. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of an existing electromagnetic multi-way valve;

[0027] Figure 2This is a schematic diagram of the multi-way valve system of the present invention;

[0028] Figure 3 This is a schematic diagram of the priority valve of the present invention.

[0029] The attached diagram lists the components represented by each number as follows:

[0030] 1. First working solenoid valve; 2. Shuttle valve; 3. First relief valve; 4. Priority valve; 401. Priority inlet; 402. First priority outlet; 403. Second priority outlet; 404. First control port; 405. Second control port; 5. Second working solenoid valve; 6. Adjustable flow valve; 7. Second relief valve; 8. First two-position two-way solenoid valve; 801. Third port; 802. Fourth port; 9. Second two-position two-way solenoid valve; 901. First port; 902. Second port; 10. First working inlet pipeline; 11. Second working inlet pipeline; 12. Working return pipeline. Detailed Implementation

[0031] The principles and features of the present invention are described below. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0032] like Figure 1 The diagram shows a schematic of a prior art electromagnetic multi-way valve, which includes an inlet valve and a working valve. The working valve controls the action of each cylinder. When both valves are energized at the same time and control the two sets of cylinders to act simultaneously, based on the basic principle of hydraulic system operation, the cylinder with a lighter load will act first, and the two cylinders cannot work synchronously.

[0033] like Figure 2 and Figure 3 As shown, this embodiment provides a multi-way valve system, including a first working solenoid valve 1, a main oil inlet line, a priority valve 4, a second working solenoid valve 5, a first working oil inlet line 10, a second working oil inlet line 11, and a working return line 12.

[0034] The priority valve 4 has a priority inlet 401, a priority first outlet 402 and a priority second outlet 403. The priority valve 4 can adjust the opening and closing of the priority inlet 401 to the priority first outlet 402 and / or the priority second outlet 403 and the degree of opening. The main oil inlet pipeline is connected to the priority inlet 401, the priority first outlet 402 is connected to the second working oil inlet pipeline 11, and the priority second outlet 403 is connected to one end of the first working oil inlet pipeline 10.

[0035] The oil inlet of the first working solenoid valve 1 is connected to the second working oil inlet pipeline 11, the oil inlet of the second working solenoid valve 5 is connected to the first working oil inlet pipeline 10, and the oil outlets of the second working solenoid valve 5 and the first working solenoid valve 1 are both connected to the working return oil pipeline 12.

[0036] In this solution, by adjusting the opening and closing of the priority inlet 401 to the priority first outlet 402 and / or the priority second outlet 403, the amount of hydraulic oil entering the second working inlet pipeline 11 and / or the first working inlet pipeline 10 is controlled, making the hydraulic oil flow into the first working solenoid valve 1 and the second working solenoid valve 5 controllable and unaffected by the load. The first working solenoid valve 1 and the second working solenoid valve 5 are connected to corresponding cylinders to control their actions. This solution, while satisfying the separate action function of two sets of cylinders with different functions, can achieve compound simultaneous action, and the action speed of the two sets of cylinders can be adjusted and distributed. Existing electromagnetic multi-way valves, if they were to achieve compound control action, would require modification by adding other multi-way valve groups, resulting in a complex structure and numerous pipeline connections. This solution achieves compound control function through integration, resulting in a compact structure and lower cost.

[0037] The first working solenoid valve 1 has an oil inlet, an oil outlet, and two working oil ports, which are respectively referred to as the first working oil port and the second working oil port. The first working solenoid valve 1 can be switched to have both working oil ports connected to the oil outlet, or switched to have the oil inlet connected to the first working oil port and the second working oil port connected to the oil outlet, or switched to have the oil inlet connected to the second working oil port and the first working oil port connected to the oil outlet.

[0038] The second working solenoid valve 5 has an oil inlet, an oil outlet, and two working oil ports, which are referred to as the third working oil port and the fourth working oil port, respectively. The second working solenoid valve 5 can be switched to have both working oil ports connected to the oil outlet, or to have the oil inlet connected to the third working oil port and the fourth working oil port connected to the oil outlet, or to have the oil inlet connected to the fourth working oil port and the third working oil port connected to the oil outlet.

[0039] Specifically, when the cylinder controlled by the first working solenoid valve 1 needs to work, the opening of the priority oil inlet 401 and the priority first outlet 402 is switched to the maximum, that is, as follows: Figure 2 and Figure 3 As shown, priority valve 4 switches to the left position. All or most of the hydraulic oil in priority inlet 401 passes through the first working solenoid valve 1 and enters the corresponding cylinder to control the extension and retraction of the corresponding cylinder.

[0040] When the cylinder controlled by the second working solenoid valve 5 needs to work, the opening of the priority oil inlet 401 and the priority second outlet 403 is switched to the maximum, that is, as Figure 2 and Figure 3 As shown, priority valve 4 switches to the right position. All hydraulic oil in priority inlet 401 passes through the second working solenoid valve 5 and enters the corresponding cylinder to control the extension and retraction of the corresponding cylinder.

[0041] When both the first working solenoid valve 1 and the second working solenoid valve 5 control the oil cylinders that need to work, the priority oil inlet 401 is simultaneously connected to the priority first outlet 402 and the priority second outlet 403. A portion of the hydraulic oil enters the first working solenoid valve 1, and the other portion of the hydraulic oil enters the second working solenoid valve 5.

[0042] Optionally, the priority valve 4, the first working solenoid valve 1, and the second working solenoid valve 5 are all connected to the controller. The controller controls the switching of the first working solenoid valve 1 and the second working solenoid valve 5, and controls the opening degree of the priority valve 4 from the priority inlet 401 to the priority first outlet 402 and / or the priority second outlet 403 according to the working conditions of the first working solenoid valve 1 and the second working solenoid valve 5.

[0043] Optionally, for the switching method of priority valve 4, the multi-way valve system also includes an adjustable flow valve 6. The priority valve 4 includes a valve body, a valve core, and a spring. The valve body has a valve cavity, and the valve core is slidably disposed in the valve cavity. The two ends of the spring abut against one end of the valve cavity and one end of the valve core, respectively. One end of the valve cavity has a first control port 404, and the other end has a second control port 405. The first control port 404 is connected to one of the working oil ports of the first working solenoid valve 1, and the second control port 405 is connected to the priority first outlet 402. The priority first outlet 402 is connected to the second working oil inlet pipeline 11 through the adjustable flow valve 6.

[0044] The movement of the valve core of the priority valve 4 is influenced by the combined effects of the oil pressure at the first control port 404, the oil pressure at the second control port 405, and the spring force. By adjusting the opening size of the adjustable flow valve 6, the operating speed of the cylinders corresponding to the first working solenoid valve 1 and the second working solenoid valve 5 can be adjusted.

[0045] Based on the above technical solution, the multi-way valve system also includes a shuttle valve 2, which has a first inlet, a second inlet, and an outlet. The shuttle valve 2 can be switched to be connected to the first inlet or the second inlet and the outlet. The first inlet and the second inlet are respectively connected to the two working ports of the first working solenoid valve 1, and the outlet is connected to the first control port 404.

[0046] The one with the higher oil pressure among the two working ports of the first working solenoid valve 1 is connected to the first control port 404 through the shuttle valve 2.

[0047] The principles of priority valve 4, adjustable flow valve 6, and shuttle valve 2 will be explained below in conjunction with the fluid flow formula.

[0048] The formula for the fluid flow rate through a hydraulic pipeline is:

[0049]

[0050] Wherein, Q represents the flow rate through the hydraulic pipeline;

[0051] C d —Flow coefficient;

[0052] A0 — Area of ​​hydraulic pipeline;

[0053] Δp — Pressure difference between the two ends of the hydraulic pipeline;

[0054] ρ — the density of the fluid.

[0055] According to the above formula, the flow rate through the hydraulic pipeline is only related to two parameters: the orifice area A0 and the pressure difference Δp.

[0056] When both the first working solenoid valve 1 and the second working solenoid valve 5 control the hydraulic cylinders, a fixed amount of oil enters the priority valve 4 through the priority inlet 401. Under the action of the spring on the left side, the valve core remains in the left position, and the oil flows out of the priority valve 4 from the priority first outlet 402. At this time, a small amount of oil from the priority first outlet 402 flows to the second control port 405 on the right side of the valve core, and simultaneously, the oil enters the adjustable flow orifice of the adjustable flow valve 6. The outlet of the adjustable flow valve 6 is connected to the second working oil inlet pipeline 11 and also to the first working solenoid valve 1. Then, when the hydraulic cylinder controlled by the first working solenoid valve 1 actuates, high-pressure oil is selected through the shuttle valve 2 and connected to the first control port 404 on the left side of the priority valve 4 through the shuttle valve outlet.

[0057] The left and right sides of the priority valve 4 have equal areas. The pressure before the fluid flows through the adjustable flow valve 6 acts on the second control port 405. The pressure after the adjustable flow valve 6 enters the first control port 404 through the shuttle valve 2. The pressure on both sides of the priority valve 4 is equal. The pressure calculated by dividing the force generated by the spring compression by the end face area of ​​the priority valve 4 is the pressure difference Δp generated by the oil flowing through the adjustable flow valve 6. At this time, the adjustable orifice area of ​​the adjustable flow valve 6 does not change after adjustment, so the flow rate through the adjustable flow valve 6 is constant.

[0058] Adjusting the opening of the adjustable flow valve 6 allows the required flow rate of hydraulic oil to flow into the first working solenoid valve 1, while the remaining hydraulic oil flows into the second working solenoid valve 5. For example, if the calculated flow rate based on the pressure difference Δp calculated using the current spring force and the area of ​​the adjustable flow orifice is 5 L / min, when the flow rate entering through the priority inlet 401 is less than or equal to 5 L / min, all the flow passes through the adjustable flow valve 6 and enters the first working solenoid valve 1. At this time, there is no flow at the priority second outlet 403. When the flow rate through the priority inlet 401 is greater than 5 L / min, for example, 7 L / min, then 5 L / min flows out from the adjustable flow valve 6, and 2 L / min flows out from the priority second outlet 403. This allows for the combined action of the cylinders controlled by the first working solenoid valve 1 and the second working solenoid valve 5. If the opening of the adjustable flow orifice is reduced, for example, if the calculated flow rate is 4 L / min, then 4 L / min flows out from the adjustable flow valve 6, and 3 L / min flows out from the priority second outlet 403. The opposite occurs if the adjustable orifice opening is increased.

[0059] Based on the above technical solution, the multi-way valve system also includes a first relief valve 3, the inlet of which is connected to the outlet of the shuttle valve, and the outlet of which is connected to the working return oil pipeline 12.

[0060] The first relief valve 3 overflows excess hydraulic oil from the shuttle valve outlet to the working return oil line 12.

[0061] Based on the above technical solution, the multi-way valve system also includes a second two-position two-way solenoid valve 9. The second two-position two-way solenoid valve 9 has a first oil port 901 and a second oil port 902. The second two-position two-way solenoid valve 9 can be switched to connect or disconnect the first oil port 901 and the second oil port 902. The other end of the first working oil inlet pipeline 10 is connected to the first oil port 901, and the second oil port 902 is connected to the working oil return pipeline 12.

[0062] The second two-position two-way solenoid valve 9 is located downstream of the priority valve 4 to perform unloading control, reduce power loss, and save energy.

[0063] Based on the above technical solution, the multi-way valve system also includes a main return oil pipeline, and the working return oil pipeline 12 is connected to the main return oil pipeline.

[0064] The hydraulic oil in the working return oil line 12 returns to the oil tank through the main return oil line.

[0065] Based on the above technical solution, the multi-way valve system also includes a first two-position two-way solenoid valve 8. The first two-position two-way solenoid valve 8 has a third oil port 801 and a fourth oil port 802. The first two-position two-way solenoid valve 8 can be switched to connect or disconnect the third oil port 801 and the fourth oil port 802. The third oil port 801 is connected to the main oil inlet pipeline, and the fourth oil port 802 is connected to the main oil return pipeline.

[0066] The first two-way solenoid valve 8 is located upstream of the priority valve 4 to perform unloading control, reduce power loss, and save energy.

[0067] Specifically, the main oil inlet line has a P port, which is connected to the pump. The main oil return line has a T port, which is connected to the oil tank.

[0068] Based on the above technical solution, the multi-way valve system also includes a second relief valve 7, the inlet of which is connected to the main oil inlet pipeline, and the outlet of which is connected to the working return oil pipeline 12.

[0069] When the oil pressure in the main inlet line is too high, the hydraulic oil can overflow to the working return line 12 through the second relief valve 7.

[0070] Based on the above technical solution, the second working solenoid valve 5 is provided with at least two.

[0071] This solution can achieve simultaneous combined operation of any second working solenoid valve 5 and the first working solenoid valve 1.

[0072] like Figure 2 and Figure 3 As shown, the working process of the multi-way valve system in this embodiment is as follows:

[0073] 1. When there is no control signal from any of the solenoid valves, the first two-position two-way solenoid valve 8 is in the initial position. The pump output flow enters the multi-way valve system through port P, then flows through port 801 to port 802, enters the main return oil pipeline, and flows out of the multi-way valve system through port T back to the oil tank, realizing the unloading function and saving energy.

[0074] 2. When the cylinder controlled by the second working solenoid valve 5 needs to move, the coil of the first two-position two-way solenoid valve 8 receives a control signal (the third port 801 to the fourth port 802 are cut off), one end of the solenoid coil of the second working solenoid valve 5 receives a control signal, and the coil of the second two-position two-way solenoid valve 9 receives a control signal (the first port 901 to the second port 902 are cut off). At this time, the pump output flow enters the priority valve 4 through port P. Because there is no signal at both ends of the solenoid coil of the first working solenoid valve 1, the first working solenoid valve 1 is in the neutral position. The force on the left side of the spring chamber of the priority valve 4 is lower than the thrust generated by the right pilot oil (hydraulic oil at the second control port 405), causing the priority valve 4 to work in the right position. All the flow output by the pump enters the second working solenoid valve 5, and then enters the cylinder controlled by the second working solenoid valve 5, pushing the cylinder to move accordingly.

[0075] 3. When the cylinder controlled by the first working solenoid valve 1 needs to operate, the coil of the first two-position two-way solenoid valve 8 receives a control signal (the third oil port 801 to the fourth oil port 802 are cut off), and one end of the solenoid coil of the first working solenoid valve 1 receives a control signal, while the coil of the second two-position two-way solenoid valve 9 receives no control signal (the first oil port 901 to the second oil port 902 are connected). At this time, the pump output flow enters the priority valve 4 through port P. Because the solenoid coils at both ends of the second working solenoid valve 5 receive no signal, and the coil of the second two-position two-way solenoid valve 9 receives no control signal, the sum of the force generated by the spring compression in the left spring chamber of the priority valve 4 and the working pressure generated by the cylinder controlled by the first working solenoid valve 1 is greater than the thrust generated by the pilot oil on the right side of the priority valve 4. At this time, the force difference on both sides of the priority valve 4 is equal to the constant value of the spring force. Therefore, the flow rate entering the adjustable flow valve 6 through the priority valve 4 is only related to the opening size of the adjustable flow orifice of the adjustable flow valve 6. When the adjustable orifice opening is increased, a larger flow of hydraulic oil enters the first working solenoid valve 1 through the adjustable orifice valve 6, while the remaining smaller flow of hydraulic oil enters the second two-position two-way solenoid valve 9 through the priority second outlet 403 and returns to the oil tank through port T. When the adjustable orifice opening is decreased, a smaller flow of hydraulic oil enters the adjustable orifice valve 6 through the priority valve 4, while the remaining larger flow enters the second two-position two-way solenoid valve 9 through the priority second outlet 403 and returns to the oil tank through port T.

[0076] 4. When the cylinder controlled by the first working solenoid valve 1 and the cylinder controlled by the second working solenoid valve 5 operate simultaneously, one of the solenoid coils of the first working solenoid valve 1, one of the solenoid coils of the second working solenoid valve 5, and the first two-position two-way solenoid valve 8 and the second two-position two-way solenoid valve 9 simultaneously receive control electrical signals. At this time, the pump outputs oil, which enters the priority valve 4 through port P for oil diversion. Part of the oil enters the first working solenoid valve 1 through the adjustable flow valve 6 to control the corresponding cylinder, while the remaining oil enters the second working solenoid valve 5 through the priority valve 4 to control the corresponding cylinder. The pump output flow can be distributed by adjusting the diameter (opening degree) of the adjustable flow valve 6, thereby adjusting the extension and retraction speed of the cylinders of the first working solenoid valve 1 and the second working solenoid valve 5.

[0077] This embodiment also provides a hydraulic system, including the aforementioned multi-way valve system.

[0078] This embodiment also provides an agricultural machine, including the aforementioned hydraulic system.

[0079] Agricultural machinery can be corn harvesters or other crop harvesters, or it can be seeders and other agricultural machinery.

[0080] In the description of this invention, 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.

[0081] 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.

[0082] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0083] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-way valve system, characterized in that, It includes a first working solenoid valve (1), a shuttle valve (2), a main oil inlet line, a priority valve (4), a second working solenoid valve (5), an adjustable flow valve (6), a first working oil inlet line (10), a second working oil inlet line (11), and a working return line (12). The priority valve (4) has a priority inlet (401), a priority first outlet (402) and a priority second outlet (403). The priority valve (4) can adjust the opening and closing of the priority inlet (401) to the priority first outlet (402) and / or the priority second outlet (403) and the degree of opening. The main oil inlet pipeline is connected to the priority inlet (401), the priority first outlet (402) is connected to the second working oil inlet pipeline (11), and the priority second outlet (403) is connected to one end of the first working oil inlet pipeline (10). The oil inlet of the first working solenoid valve (1) is connected to the second working oil inlet pipeline (11), the oil inlet of the second working solenoid valve (5) is connected to the first working oil inlet pipeline (10), and the oil outlet of the second working solenoid valve (5) and the oil outlet of the first working solenoid valve (1) are both connected to the working return oil pipeline (12). The priority valve (4) includes a valve body, a valve core and a spring. The valve body has a valve cavity. The valve core is slidably disposed in the valve cavity. The two ends of the spring abut against one end of the valve cavity and one end of the valve core, respectively. One end of the valve cavity has a first control port (404) and the other end has a second control port (405). The first control port (404) is connected to one of the working oil ports of the first working solenoid valve (1). The second control port (405) is connected to the priority first outlet (402). The priority first outlet (402) is connected to the second working oil inlet pipeline (11) through the adjustable flow valve (6). The shuttle valve (2) has a first inlet, a second inlet and an outlet. The shuttle valve (2) can be switched to the first inlet or the second inlet and the outlet are connected. The first inlet and the second inlet are connected to the two working ports of the first working solenoid valve (1) respectively. The outlet is connected to the first control port (404). The pressure before the adjustable flow valve (6) acts on the second control port (405), and the pressure after the adjustable flow valve (6) enters the first control port (404) through the shuttle valve (2).

2. The multi-way valve system according to claim 1, characterized in that, It also includes a first overflow valve (3), the inlet of which is connected to the outlet of the shuttle valve, and the outlet of which is connected to the working return oil pipeline (12).

3. The multi-way valve system according to claim 1, characterized in that, It also includes a second two-position two-way solenoid valve (9), which has a first oil port (901) and a second oil port (902). The second two-position two-way solenoid valve (9) can be switched to connect or disconnect the first oil port (901) and the second oil port (902). The other end of the first working oil inlet pipeline (10) is connected to the first oil port (901), and the second oil port (902) is connected to the working oil return pipeline (12).

4. A multi-way valve system according to claim 1, characterized in that, It also includes a main return oil pipeline, and the working return oil pipeline (12) is connected to the main return oil pipeline.

5. A multi-way valve system according to claim 4, characterized in that, It also includes a first two-position two-way solenoid valve (8), which has a third oil port (801) and a fourth oil port (802). The first two-position two-way solenoid valve (8) can be switched to connect or disconnect the third oil port (801) and the fourth oil port (802). The third oil port (801) is connected to the main oil inlet pipeline, and the fourth oil port (802) is connected to the main oil return pipeline.

6. A multi-way valve system according to any one of claims 1-5, characterized in that, It also includes a second relief valve (7), the inlet of which is connected to the main oil inlet pipeline, and the outlet of which is connected to the working return oil pipeline (12).

7. A hydraulic system, characterized in that, Includes the multi-way valve system as described in any one of claims 1-6.

8. An agricultural machine, characterized in that, Includes the hydraulic system as described in claim 7.

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