Multi-output hydraulic system

Abstract

The utility model provides a multi-output hydraulic system, including main pump, oil tank, priority valve, primary execution valve, three-way flow valve, secondary execution valve, the inlet of main pump is connected with oil tank, the outlet of main pump is connected with the inlet of priority valve, the first outlet of priority valve is connected with primary execution valve, the second outlet of priority valve is connected with three-way flow valve, the first-level execution valve is connected with the three-way flow valve, and the second-level execution valve is connected with the three-way flow valve. A first outlet of the three-way flow valve is connected with a second-stage execution valve, and a second outlet of the three-way flow valve is connected with a third-stage execution valve set. According to the utility model, the priority valve and the three-way flow valve are integrated on the hydraulic oil path, so that the flow of the first-stage execution valve is guaranteed preferentially, the flow of the second-stage execution valve is guaranteed, and the residual flow is supplied to the third-stage execution valve group; when a plurality of actuators act at the same time, the hydraulic flow is distributed according to the priority, so that the working speed of the actuators is prevented from being influenced by load change, and the working stability of machines and tools is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of tractor hydraulic systems, in particular to a multi-channel output hydraulic system. Background Art

[0002] With the development of wheeled tractor technology, there are more requirements for the functions of tractor hydraulic systems. The hydraulic systems of tractors on the market now not only have the functions of lifting and floating the implements, but also have the function of hydraulic remote output, which requires constant hydraulic output. In addition, for uneven ground or slope operations, the leveling function of tractor implements is becoming more and more important.

[0003] During tractor farmland operations, one operation may require multiple hydraulic actions such as hydraulic constant output function and implement leveling function to work simultaneously, and each action does not affect each other. When the hydraulic system cannot provide sufficient flow, in order to ensure the efficiency and quality of the operation as much as possible, the priority of each action is different. At present, small and medium horsepower tractors usually use a fixed-displacement pump open-center hydraulic system. When multiple actuators are in operation at the same time, the oil flows first to the actuator with lower load. If the load of the actuator is variable, it will cause the implement working speed to be unstable, seriously affecting the quality and efficiency of the operation. Utility Model Content

[0004] The technical problem to be solved by the utility model is: how to supply oil to the actuator according to priority to ensure the stable working speed of the machine.

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

[0006] The utility model provides a multi-way output hydraulic system, comprising a main pump, an oil tank, a priority valve, a primary execution valve, a three-way flow valve, and a secondary execution valve, wherein the inlet of the main pump is connected to the oil tank, the outlet of the main pump is connected to the inlet of the priority valve, the first outlet of the priority valve is connected to the primary execution valve, the second outlet of the priority valve is connected to the three-way flow valve, the first outlet of the three-way flow valve is connected to the secondary execution valve, and the second outlet of the three-way flow valve is connected to a three-stage execution valve group.

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

[0008] By adopting the utility model, the priority valve and the three-way flow valve are integrated in the hydraulic oil circuit, so that the flow of the first-level actuator valve is guaranteed first, and the flow of the second-level actuator valve is guaranteed secondly, and the remaining flow is supplied to the third-level actuator valve group, so that the flow of the hydraulic system is reasonably distributed to each actuator valve, thereby controlling the hydraulic action of each actuator; when multiple actuators are actuated at the same time, the hydraulic flow is distributed according to the priority, thereby avoiding the working speed of the actuator from being affected by the load change, and ensuring the stable operation of the machine.

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

[0010] Furthermore, the three-stage actuator valve group includes a first actuator valve and a second actuator valve, and the second outlet of the three-way flow valve is connected to the first actuator valve and the second actuator valve through branches respectively.

[0011] The first actuator valve can be used to expand the hydraulic remote output, and the second actuator valve can be used to connect the lifting control valve to supply oil to the lifting cylinder to control the rise or fall of the machine; the first actuator valve and the second actuator valve can work independently to facilitate the expansion of tractor functions.

[0012] Furthermore, the first actuating valve and the second actuating valve are both reversing valves, and the oil return port of the first actuating valve and the oil return port of the second actuating valve are both connected to the oil tank.

[0013] When the first actuating valve and the second actuating valve are not working, it is convenient to unload the hydraulic oil in the hydraulic oil circuit to the oil tank through the oil return port.

[0014] Furthermore, a first one-way valve is provided on the branch from the second outlet of the three-way flow valve to the first actuator valve, and the first one-way valve can allow the hydraulic oil to flow from the second outlet of the three-way flow valve to the first actuator valve in one direction.

[0015] The first one-way valve prevents the pressure oil from flowing back and impacting the main pump when the load of the actuator controlled by the first actuator valve is too large during operation, thereby preventing the main pump from being damaged.

[0016] Furthermore, a second one-way valve is provided on the branch line from the second outlet of the three-way flow valve to the second actuator valve, and the second one-way valve can allow the hydraulic oil to flow from the second outlet of the three-way flow valve to the second actuator valve in one direction.

[0017] The second one-way valve prevents the pressure oil from flowing back and impacting the main pump when the load of the actuator controlled by the second actuator valve is too large during operation, thereby preventing the main pump from being damaged.

[0018] Furthermore, a third one-way valve is provided on the hydraulic oil circuit from the first outlet of the three-way flow valve to the secondary actuator valve, and the third one-way valve can allow the hydraulic oil to flow from the first outlet of the three-way flow valve to the secondary actuator valve in one direction.

[0019] The third one-way valve prevents the pressure oil from flowing back and impacting the main pump when the load is too large during the operation of the actuator controlled by the secondary actuator valve, thereby preventing the main pump from being damaged.

[0020] Furthermore, the secondary actuator valve is a reversing valve, and the oil return port of the secondary actuator valve is connected to the oil tank.

[0021] When the secondary actuator valve is not working, it is convenient to unload the hydraulic oil in the hydraulic oil circuit to the oil tank through the oil return port.

[0022] Furthermore, a first pressure relief branch is provided on the hydraulic oil circuit from the second outlet of the priority valve to the three-way flow valve. The first pressure relief branch is connected to the oil tank and a first safety valve is provided on the first pressure relief branch.

[0023] The first safety valve can control the maximum working pressure of the secondary actuator valve and the tertiary actuator valve group. When the hydraulic oil is over-pressured, the first safety valve opens and part of the oil is unloaded to the oil tank through the first pressure relief branch, thereby improving the safety of the hydraulic system.

[0024] Furthermore, a second pressure relief branch is provided on the hydraulic oil circuit from the outlet of the main pump to the inlet of the priority valve, the second pressure relief branch is connected to the oil tank, and a second safety valve is provided on the second pressure relief branch.

[0025] The second safety valve can control the maximum working pressure of the total hydraulic oil circuit. When the hydraulic oil at the main pump outlet is over-pressured, the second safety valve opens and part of the oil is unloaded to the oil tank through the second pressure relief branch, thereby improving the safety of the hydraulic system.

[0026] Furthermore, the first-stage actuator valve is a reversing valve, and the oil return port of the first-stage actuator valve is connected to the oil tank.

[0027] When the first-stage actuator valve is not working, it is convenient to unload the hydraulic oil in the hydraulic oil circuit to the oil tank through the oil return port. 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; 2-first stage actuator valve; 3-three-way flow valve; 4-second stage actuator valve; 5-main pump; 6-oil tank; 7-first actuator valve; 8-second actuator valve; 9-first safety valve; 10-second safety valve; 11-first one-way valve; 12-second one-way valve; 13-third one-way 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 multi-way output hydraulic system, comprising a main pump 5, an oil tank 6, a priority valve 1, a primary executing valve 2, a three-way flow valve 3, and a secondary executing valve 4, wherein the inlet of the main pump 5 is connected to the oil tank 6, the outlet of the main pump 5 is connected to the inlet of the priority valve 1, the first outlet of the priority valve 1 is connected to the primary executing valve 2, the second outlet of the priority valve 1 is connected to the three-way flow valve 3, the first outlet of the three-way flow valve 3 is connected to the secondary executing valve 4, and the second outlet of the three-way flow valve 3 is connected to a three-stage executing valve group.

[0034] principle:

[0035] When in use, the first-level actuator valve 2 can be used to connect the implement leveling cylinder, which is used to control the horizontal angle of the implement; the second-level actuator valve 4 can be used for constant hydraulic remote output; the third-level actuator valve group can be used to expand the hydraulic remote output and connect the lifting control valve, where the lifting control valve is used to supply oil to the lifter to control the lifting or lowering of the implement. The implement leveling cylinder, lifting control valve, etc. are existing technologies on tractors.

[0036] During operation, the main pump 5 supplies oil to the priority valve 1, and the priority valve 1 works at the first outlet by default, giving priority to ensuring the flow required by the first-level actuator valve 2; when the flow is sufficient or the first-level actuator valve 2 is closed, the second outlet of the priority valve 1 is opened, and the excess oil enters the three-way flow valve 3 through the second outlet of the priority valve 1; the three-way flow valve 3 works at the first outlet by default, giving priority to ensuring the flow required by the second-level actuator valve 4; when the flow is sufficient or the second-level actuator valve 4 is closed, the second outlet of the three-way flow valve 3 is opened, and the excess oil is supplied to the three-level actuator valve group.

[0037] By adopting the utility model, the priority valve 1 and the three-way flow valve 3 are integrated in the hydraulic oil circuit, so that the flow of the first-level actuator valve 2 is prioritized, and the flow of the second-level actuator valve 4 is secondly guaranteed, and the remaining flow is supplied to the third-level actuator valve group, so that the flow of the hydraulic system is reasonably distributed to each actuator valve, thereby controlling the hydraulic action of each actuator; when multiple actuators are actuated at the same time, the hydraulic flow is distributed according to priority, thereby avoiding the working speed of the actuator from being affected by load changes and ensuring stable operation of the machine.

[0038] Furthermore, the three-stage actuating valve group includes a first actuating valve 7 and a second actuating valve 8, and the second outlet of the three-way flow valve 3 is connected to the first actuating valve 7 and the second actuating valve 8 through branches.

[0039] The first actuator valve 7 can be used to expand the hydraulic remote output, and the second actuator valve 8 can be used to connect the lifting control valve to supply oil to the lifting cylinder to control the rise or fall of the machine; the first actuator valve 7 and the second actuator valve 8 can work independently, which is convenient for expanding the tractor function.

[0040] Furthermore, the first actuating valve 7 and the second actuating valve 8 are both reversing valves, and the oil return port of the first actuating valve 7 and the oil return port of the second actuating valve 8 are both connected to the oil tank 6 .

[0041] When the first actuating valve 7 and the second actuating valve 8 are not working, it is convenient to unload the hydraulic oil in the hydraulic oil circuit to the oil tank 6 through the oil return port.

[0042] Furthermore, a first one-way valve 11 is provided on the branch from the second outlet of the three-way flow valve 3 to the first actuator valve 7 . The first one-way valve 11 enables the hydraulic oil to flow from the second outlet of the three-way flow valve 3 to the first actuator valve 7 in one direction.

[0043] The first one-way valve 11 prevents the pressure oil from flowing back and impacting the main pump when the load is too large during the operation of the actuator controlled by the first actuator valve 7, thereby preventing the main pump from being damaged.

[0044] Furthermore, a second one-way valve 12 is provided on the branch line from the second outlet of the three-way flow valve 3 to the second actuator valve 8 , and the second one-way valve 12 can allow the hydraulic oil to flow from the second outlet of the three-way flow valve 3 to the second actuator valve 8 in one direction.

[0045] The second one-way valve 12 prevents the pressure oil from flowing back and impacting the main pump when the load is too large during the operation of the actuator controlled by the second actuator valve 8, thereby preventing the main pump from being damaged.

[0046] Furthermore, a third one-way valve 13 is provided on the hydraulic oil circuit from the first outlet of the three-way flow valve 3 to the secondary actuator valve 4 , and the third one-way valve 13 enables the hydraulic oil to flow from the first outlet of the three-way flow valve 3 to the secondary actuator valve 4 in one direction.

[0047] The third one-way valve 13 prevents the pressure oil from flowing back and impacting the main pump when the load is too large during the operation of the actuator controlled by the secondary actuator valve 4, thereby preventing the main pump from being damaged.

[0048] Furthermore, the secondary actuating valve 4 is a reversing valve, and the oil return port of the secondary actuating valve 4 is connected to the oil tank 6 .

[0049] When the secondary actuator valve 4 is not working, it is convenient to unload the hydraulic oil in the hydraulic oil circuit to the oil tank 6 through the oil return port.

[0050] Furthermore, a first pressure relief branch is provided on the hydraulic oil circuit from the second outlet of the priority valve 1 to the three-way flow valve 3 . The first pressure relief branch is connected to the oil tank 6 , and a first safety valve 9 is provided on the first pressure relief branch.

[0051] The first safety valve 9 can control the maximum working pressure of the secondary actuator valve 4 and the tertiary actuator valve group. When the hydraulic oil is over-pressured, the first safety valve 9 opens, and part of the oil is unloaded to the oil tank 6 through the first pressure relief branch, thereby improving the safety of the hydraulic system.

[0052] Furthermore, a second pressure relief branch is provided on the hydraulic oil circuit from the outlet of the main pump 5 to the inlet of the priority valve 1 , the second pressure relief branch is connected to the oil tank 6 , and a second safety valve 10 is provided on the second pressure relief branch.

[0053] The second safety valve 10 can control the maximum working pressure of the total hydraulic oil circuit. When the hydraulic oil at the outlet of the main pump 5 is over-pressured, the second safety valve 10 opens, and part of the oil is unloaded to the oil tank 6 through the second pressure relief branch, thereby improving the safety of the hydraulic system.

[0054] Furthermore, the primary actuator valve 2 is a reversing valve, and the oil return port of the primary actuator valve 2 is connected to the oil tank 6 .

[0055] When the first-stage actuator valve 2 is not working, it is convenient to unload the hydraulic oil in the hydraulic oil circuit to the oil tank 6 through the oil return port.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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 multi-output hydraulic system, characterized in that: The invention comprises a main pump (5), an oil tank (6), a priority valve (1), a primary actuator valve (2), a three-way flow valve (3), and a secondary actuator valve (4); the inlet of the main pump (5) is connected to the oil tank (6); the outlet of the main pump (5) is connected to the inlet of the priority valve (1); the first outlet of the priority valve (1) is connected to the primary actuator valve (2); the second outlet of the priority valve (1) is connected to the three-way flow valve (3); the first outlet of the three-way flow valve (3) is connected to the secondary actuator valve (4); and the second outlet of the three-way flow valve (3) is connected to a three-stage actuator valve group.

2. The multi-output hydraulic system according to claim 1, characterized in that: The three-stage actuator valve group comprises a first actuator valve (7) and a second actuator valve (8), and the second outlet of the three-way flow valve (3) is connected to the first actuator valve (7) and the second actuator valve (8) via branches.

3. The multi-output hydraulic system according to claim 2, characterized in that: The first actuating valve (7) and the second actuating valve (8) are both reversing valves, and the oil return port of the first actuating valve (7) and the oil return port of the second actuating valve (8) are both connected to the oil tank (6).

4. The multi-output hydraulic system according to claim 2, characterized in that: A first one-way valve (11) is also provided on the branch line from the second outlet of the three-way flow valve (3) to the first actuator valve (7). The first one-way valve (11) can allow the hydraulic oil to flow from the second outlet of the three-way flow valve (3) to the first actuator valve (7) in a one-way manner.

5. The multi-output hydraulic system according to claim 2, characterized in that: A second one-way valve (12) is also provided on the branch line from the second outlet of the three-way flow valve (3) to the second actuator valve (8). The second one-way valve (12) can allow the hydraulic oil to flow from the second outlet of the three-way flow valve (3) to the second actuator valve (8) in a one-way manner.

6. The multi-output hydraulic system according to claim 1, characterized in that: A third one-way valve (13) is also provided on the hydraulic oil circuit from the first outlet of the three-way flow valve (3) to the secondary actuating valve (4). The third one-way valve (13) can allow the hydraulic oil to flow from the first outlet of the three-way flow valve (3) to the secondary actuating valve (4) in a one-way manner.

7. The multi-output hydraulic system according to claim 6, characterized in that: The secondary actuating valve (4) is a reversing valve, and the oil return port of the secondary actuating valve (4) is connected to the oil tank (6).

8. The multi-output hydraulic system according to claim 1, characterized in that: A first pressure relief branch is also provided on the hydraulic oil circuit from the second outlet of the priority valve (1) to the three-way flow valve (3); the first pressure relief branch is connected to the oil tank (6); and a first safety valve (9) is provided on the first pressure relief branch.

9. The multi-output hydraulic system according to claim 1, characterized in that: A second pressure relief branch is also provided on the hydraulic oil circuit from the outlet of the main pump (5) to the inlet of the priority valve (1), the second pressure relief branch is connected to the oil tank (6), and a second safety valve (10) is provided on the second pressure relief branch.

10. The multi-output hydraulic system according to claim 1, characterized in that: The first-stage actuator valve (2) is a reversing valve, and the oil return port of the first-stage actuator valve (2) is connected to the oil tank (6).

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