Through-flow valve group and hydraulic system

Abstract

The utility model relates to the technical field of hydraulic systems, in particular to a through-flow valve group and a hydraulic system. A through-flow valve group comprises a parallel oil way, a first oil way and a second oil way, and the parallel oil way comprises the first oil way and the second oil way which are arranged in parallel; the first valve is located on the first oil way, and the first valve controls the through-flow area of the first oil way to change discontinuously; the second valve is located on the second oil way, and the second valve controls the through-flow area of the second oil way to change continuously. The utility model further provides a hydraulic system, which comprises a first valve body, a second valve body, a first piston and a second piston, the through-flow valve group is assembled on the first valve body; and pressure oil in the pressure oil duct is supplied to the actuator through the through-flow valve group. The technical problem that in the prior art, a logic valve only has two working states, and continuous change of the opening area in the middle range cannot be achieved is solved.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic system technology, and in particular to a flow valve assembly and a hydraulic system. Background Technology

[0002] Currently, medium and large excavators and other models widely use open-center hydraulic systems. When the machine performs compound actions (two or more actuators operating simultaneously), the flow is preferentially allocated to the actuators with lower loads, while the actuators with higher loads receive very little or no flow, resulting in slow or even no movement from the actuators with higher loads. To ensure the coordination of compound actions, a logic valve is usually installed on the main valve to achieve this function.

[0003] Existing logic valves are typically cone valves, controlled by pilot pressure signals, functioning similarly to a switch: when the machine operates alone, the logic valve opening area is large, ensuring sufficient flow capacity; when the machine operates in combination, the logic valve opening area is small, limiting oil intake for actuators with lower loads, thus allowing actuators with higher loads to receive a certain flow, ensuring the coordination of combination actions.

[0004] However, logic valves with a cone valve structure only have two operating states: large opening area and small opening area. They cannot achieve continuous variation of the opening area within the intermediate range. When the load conditions change or different compound actions are performed, logic valves with a cone valve structure may not be able to guarantee the coordination of compound actions under different conditions. Utility Model Content

[0005] To address the technical problem that existing logic valves only have two operating states and cannot achieve continuous variation of the opening area within a certain range, this invention provides a flow valve assembly and hydraulic system that solves the aforementioned technical problem.

[0006] To solve the above-mentioned technical problems, this utility model provides a flow valve assembly, comprising:

[0007] Parallel oil circuit, wherein the parallel oil circuit includes a first oil circuit and a second oil circuit arranged in parallel;

[0008] The first valve is located in the first oil line, and the first valve controls the discontinuous change of the flow area of ​​the first oil line;

[0009] The second valve, located in the second oil circuit, controls the continuous change of the flow area of ​​the second oil circuit.

[0010] According to one embodiment of the present invention, the first valve controls the first oil circuit to have two states: a large opening for flow and a cut-off state; or, the first valve controls the first oil circuit to have two states: a large opening for flow and a small opening for flow.

[0011] According to one embodiment of the present invention, the first valve includes an outer cone valve core and an inner cone valve core. The outer cone valve core is slidably assembled in the body of the first valve body. In the initial state, the outer cone valve core abuts against the inner wall of the valve body under the action of a first elastic member, blocking the communication between the first oil inlet and the first oil outlet. The inner cone valve core is slidably assembled in the body of the outer cone valve core and abuts against the inner wall of the outer cone valve core under the action of a second elastic member.

[0012] According to one embodiment of the present invention, the cavity where the first elastic element is located is a control cavity. A pilot valve controls the oil to enter the control cavity. When the pilot valve is in the first position, the first oil outlet is connected to the control cavity through the pilot valve. When the pilot valve is in the second position, the pressure oil at the first oil inlet pushes open the inner cone valve core and enters the control cavity.

[0013] According to one embodiment of the present invention, the outer cone valve core is provided with a first flow hole, the first flow hole is connected to the first oil outlet, and the pressure oil in the first oil inlet opens the inner cone valve core and enters the first oil outlet through the first flow hole.

[0014] According to one embodiment of the present invention, the second valve is a slide valve structure. The second valve includes a valve core and a second valve body. The valve core is slidably assembled in the second valve body. The second valve body is provided with a second oil inlet and a second oil outlet. The valve core compresses a fourth elastic element to slide under the action of pilot oil to control the opening degree between the second oil inlet and the second oil outlet.

[0015] According to one embodiment of the present invention, a one-way valve is also provided in the second oil circuit.

[0016] According to one embodiment of the present invention, the one-way valve includes a cone valve core, which is slidably mounted on a first valve body. In the initial state, the cone valve core abuts against the inner wall of the first valve body under the action of a third elastic element, blocking the communication between the third oil inlet and the third oil outlet. A second flow hole is formed on the cone valve core, and the cavity where the third elastic element is located is connected to the third oil outlet through the second flow hole.

[0017] This utility model also provides a hydraulic system, including:

[0018] A first valve body, wherein a pressure oil passage is provided within the first valve body;

[0019] A flow-through valve assembly, which is mounted on the first valve body;

[0020] The actuator is supplied with pressurized oil from the pressure oil passage via the flow valve assembly.

[0021] According to one embodiment of the present invention, a control valve is also included, wherein the pressure oil in the pressure oil passage is supplied to the control valve via the flow valve group, and the control valve controls the oil inlet and outlet of the actuator.

[0022] Based on the above technical solution, the technical effects that this utility model can achieve are as follows:

[0023] This utility model's flow-through valve assembly, by setting two parallel oil circuits, with a first valve and a second valve respectively installed on each circuit, allows the first and second valves to work in coordination. The first valve ensures sufficient flow capacity, while the second valve is used for fine adjustment of the overall machine's combined actions. Compared to existing technologies that only use logic valves with two operating states, this flow-through valve assembly can ensure sufficient flow capacity through the first valve when the machine operates independently, and adjust the opening area of ​​the second valve during combined machine actions to achieve coordination of combined actions under different conditions.

[0024] The flow valve assembly of this utility model has a check valve installed in the second oil circuit, and the check valve is specifically designed as a cone valve structure, which can realize the unidirectional flow function and the load holding function, that is, when the load pressure is higher than the pump pressure, the oil will not flow back.

[0025] The flow control valve assembly of this utility model specifically features a first valve structure. The first valve employs an outer cone valve core and an inner cone valve core, and a pilot valve controls the oil flow into the control chamber. Therefore, the first valve can achieve unidirectional flow and has two states. Without a first flow orifice on the outer cone valve core, the first valve can achieve both large-opening flow and cut-off states; with a first flow orifice on the outer cone valve core, the first valve can achieve both large-opening flow and small-opening flow states.

[0026] The flow valve assembly of this utility model specifically sets the second valve to be a slide valve, which slides under the action of pilot oil, and the opening area can be continuously changed to ensure the coordination of compound actions.

[0027] In the hydraulic system of this invention, the pressure oil passage supplies oil to the actuator through a flow-through valve assembly. When the entire machine operates independently, neither the first nor the second valve needs to be subjected to pilot pressure. Both the first and second valves have large opening areas to ensure sufficient flow capacity, with the first valve having a larger opening area, and its flow capacity is mainly guaranteed by the first valve. When the entire machine is in compound motion, a fixed pilot pressure is applied to the first valve to switch it to an off state or a small-opening flow state. A variable pilot pressure is applied to the second valve, allowing its opening area to be adjusted to any value within a certain range, thereby achieving coordination of compound motion under different conditions and enabling fine adjustment of the compound motion of the entire machine. Attached Figure Description

[0028] Figure 1This is a hydraulic schematic diagram of the flow valve assembly according to Embodiment 1 of this utility model;

[0029] Figure 2 This is a hydraulic schematic diagram of the hydraulic system in Example 1;

[0030] Figure 3 for Figure 2 A magnified view of a portion of the image;

[0031] Figure 4 A schematic diagram of a structure for integrating and mounting multiple valves on the first valve body of a hydraulic system;

[0032] Figure 5 for Figure 4 Left view of the structure shown;

[0033] Figure 6 for Figure 4 AA section diagram;

[0034] Figure 7 for Figure 6 Enlarged view of part E;

[0035] Figure 8 for Figure 4 BB cross-section diagram;

[0036] Figure 9 for Figure 8 Enlarged view of part F;

[0037] Figure 10 for Figure 4 CC section view;

[0038] Figure 11 for Figure 10 Enlarged view of part G;

[0039] Figure 12 for Figure 5 DD cross-sectional view;

[0040] Figure 13 This is a hydraulic schematic diagram of the flow valve assembly according to Embodiment 2 of this utility model;

[0041] Figure 14 This is a hydraulic schematic diagram of the hydraulic system in Example 2;

[0042] Figure 15 for Figure 14 A magnified view of a portion of the image;

[0043] In the diagram: 1-Parallel oil circuit; 11-First oil circuit; 12-Second oil circuit; 2-First valve; 21-Outer cone valve core; 211-First flow passage; 22-Inner cone valve core; 23-First elastic element; 24-Second elastic element; 25-First plug; 26-Control chamber; 3-Second valve; 31-Second valve body; 311-Second oil inlet; 312-Second oil outlet; 32-Valve core; 33-Fourth elastic element; 34-Drain chamber ; 35-Pilot chamber; 4-Check valve; 41-Cone valve core; 411-Second flow passage; 42-Third elastic element; 43-Second plug; 5-First valve body; 51-Pressure oil passage; 52-First oil inlet; 53-First oil outlet; 54-Third oil inlet; 55-Third oil outlet; 6-Pilot valve; 61-Pilot valve body; 62-Pilot valve core; 63-Fifth elastic element; 64-Pilot oil chamber; 7-Control valve. Detailed Implementation

[0044] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0045] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0046] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0047] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0048] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0049] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0050] Example 1

[0051] like Figure 1-12 As shown, this embodiment proposes a flow valve group, including a first valve 2 and a second valve 3 arranged in parallel. The first valve 2 ensures sufficient flow capacity, and the second valve 3 is used for fine adjustment of the overall compound action of the machine.

[0052] like Figure 1 As shown, the flow control valve assembly includes a parallel oil circuit 1, with a first valve 2 and a second valve 3 disposed on the parallel oil circuit 1. Specifically, the parallel oil circuit 1 includes a first oil circuit 11 and a second oil circuit 12 disposed in parallel. The first valve 2 is located on the first oil circuit 11 and controls the flow through the first oil circuit 11; the second valve 3 is located on the second oil circuit 12 and controls the flow through the second oil circuit 12. The first valve 2 controls the flow area of ​​the first oil circuit 11 to change discontinuously, while the second valve 3 controls the flow area of ​​the second oil circuit 12 to change continuously.

[0053] Parallel oil circuit 1 is set inside the first valve body 5, the first valve 2 is inserted into the first valve body 5, and the second valve 3 is also assembled on the first valve body 5.

[0054] The first valve 2 controls the flow area of ​​the first oil passage 11 to have two states: a large opening flow state and a small opening flow state. For example... Figure 6-7 As shown in Figures 10-11, the first valve 2 includes an outer cone valve core 21 and an inner cone valve core 22. The outer cone valve core 21 is slidably mounted inside the first valve body 5, and its end extends into the first oil passage 11. A first oil inlet 52 is formed on one side of the end face of the outer cone valve core 21, and a first oil outlet 53 is formed circumferentially around the outer cone valve core 21. In the initial state, under the action of the first elastic member 23, the outer cone valve core 21 abuts against the inner wall of the first valve body 5, blocking the communication between the first oil inlet 52 and the first oil outlet 53. The inner cone valve core 22 is slidably mounted inside the outer cone valve core 21, and under the action of the second elastic member 24, the inner cone valve core 22 abuts against the inner wall of the outer cone valve core 21.

[0055] As a preferred technical solution of this embodiment, a central through hole is formed on the central axis of the outer cone valve core 21, and the first elastic member 23 is placed at the end of the outer cone valve core 21 away from the first oil inlet 52. One end of the first elastic member 23 is fixedly abutted against, and the other end of the first elastic member 23 acts on the outer cone valve core 21. The cavity where the first elastic member 23 is located is the control cavity 26.

[0056] As a preferred technical solution of this embodiment, the inner cone valve core 22 is slidably assembled in the central through hole of the outer cone valve core 21, and the end of the outer cone valve core 21 near the first elastic member 23 is equipped with a first plug 25, and the second elastic member 24 is located between the inner cone valve core 22 and the first plug 25.

[0057] As a preferred embodiment, the outer cone valve core 21 is provided with a first flow passage 211. The first flow passage 211 extends radially, with one end connected to the central through hole of the outer cone valve core 21 and the other end connected to the first oil outlet 53. When the outer cone valve core 21 is pushed open by the high-pressure oil from the first oil inlet 52, a large opening for flow is achieved between the first oil inlet 52 and the first oil outlet 53. When the inner cone valve core 22 is pushed open by the high-pressure oil from the first oil inlet 52, the oil from the first oil inlet 52 enters the central through hole of the outer cone valve core 21 and then flows through the first flow passage 211 to the first oil outlet 53, achieving a small opening for flow between the first oil inlet 52 and the first oil outlet 53.

[0058] As a preferred technical solution of this embodiment, a central blind hole and a radial hole are formed at the center of the inner cone valve core 22. The radial hole is connected to the central blind hole and the first flow hole 211. After the high-pressure oil entering through the first oil inlet 52 pushes open the inner cone valve core 22, it can enter the cavity where the second elastic element 24 is located through the radial hole and the central blind hole, and then flow through the radial flow hole at the rear end of the outer cone valve core 21 to the cavity between the outer cone valve core 21 and the first valve body 5, and enter the control cavity 26.

[0059] The first valve 2 operates in two states under the control of the pilot valve 6. The pilot valve 6 includes a pilot valve body 61 and a pilot valve core 62. The pilot valve body 61 is mounted on the first valve body 5 and serves to seal the control chamber 26. That is, the pilot valve body 61 is sealed and mounted on the first valve body 5, blocking the chamber where the outer cone valve core 21 is located. The end of the first elastic element 23 can abut against the pilot valve body 61. The pilot valve core 62 is slidably mounted inside the pilot valve body 61. One end of the pilot valve core 62 is provided with a fifth elastic element 63, and the other end of the pilot valve core 62 forms a pilot oil chamber 64, which can introduce pilot oil. The chamber where the fifth elastic element 63 is located can communicate with the return oil tank.

[0060] As a preferred embodiment, both the first oil outlet 53 and the control chamber 26 are connected to the cavity where the pilot valve core 62 is located via oil passages. The pilot valve core 62 controls the opening and closing of the connection between the first oil outlet 53 and the control chamber 26. In the initial state, under the action of the fifth elastic element 63, the pilot valve core 62 is in the initial position, the first oil outlet 53 and the control chamber 26 are connected via the pilot valve 6, the control chamber 26 is in a low-pressure state, and the pressure oil in the first oil inlet 52 can push the outer cone valve core 21 to open, connecting the first oil inlet 52 and the first oil outlet 53, achieving a large-opening flow state. When pilot oil is introduced into pilot valve 6, pilot valve core 62 reverses under the action of pilot oil, cutting off the connection between first oil outlet 53 and control chamber 26; under the action of pressure oil in first oil inlet 52, inner cone valve core 22 opens, part of the pressure oil in first oil inlet 52 flows to first oil outlet 53 through first flow hole 211, realizing the small opening flow state of first valve 2; another part of the pressure oil enters the cavity where second elastic element 24 is located through radial hole and central blind hole of inner cone valve core 22, and then reaches control chamber 26 through radial flow hole at the rear end of outer cone valve core 21 and cavity between outer cone valve core 21 and first valve body 5. At this time, control chamber 26 is in high pressure state, causing outer cone valve core 21 to close.

[0061] The second valve 3 is a slide valve structure with a continuously variable opening area, such as... Figure 12 As shown, the second valve 3 includes a second valve body 31 and a valve core 32. The second valve body 31 is fixedly mounted on the first valve body 5. The second valve body 31 is provided with a second oil inlet 311 and a second oil outlet 312. The second oil inlet 311 is connected to the pressure oil passage 51 in the first valve body 5. The valve core 32 can slide within the second valve body 31 to control the opening area between the second oil inlet 311 and the second oil outlet 312.

[0062] As a preferred embodiment, the first end of the valve core 32 is provided with a fourth elastic element 33. Specifically, the first end of the valve core 32 is connected to a connecting screw, the fourth elastic element 33 is sleeved on the connecting screw, and spring seats are respectively provided at both ends of the fourth elastic element 33. An end cap is fixed to the end of the second valve body 31, and the connecting screw, the fourth elastic element 33, and the spring seats are all located inside the end cap. The spring seats at both ends of the fourth elastic element 33 can be limited by the inner walls of the second valve body 31 and the end cap, respectively. A pilot cavity 35 is formed at the end of the connecting screw away from the valve core 32, and an oil drain cavity 34 is formed at the second end of the valve core 32. The oil drain cavity 34 is connected to the oil drain port, and pilot oil can be introduced into the pilot cavity 35. The pilot oil pushes the connecting screw to overcome the force of the fourth elastic element 33 to drive the valve core 32 to slide, thereby controlling the opening area between the second oil inlet 311 and the second oil outlet 312.

[0063] To ensure unidirectional flow of oil in the second oil passage 12, a check valve 4 is also provided on the second oil passage 12. The check valve 4 can be located upstream of the second valve 3, that is, the pressure oil in the pressure oil passage 51 reaches the second valve 3 through the check valve 4.

[0064] One-way valve 4 can be configured as a cone valve, such as Figure 8-9 As shown, the one-way valve 4 includes a cone valve core 41, which is inserted into the first valve body 5 and sealed by a second plug 43. A third elastic element 42 is disposed between the cone valve core 41 and the second plug 43. Under the action of the third elastic element 42, the cone valve core 41 abuts against the inner wall of the first valve body 5. A third oil inlet 54 is formed on the end face of the cone valve core 41 away from the second plug 43, and a third oil outlet 55 is formed on the outer periphery of the cone valve core 41. The third oil inlet 54 is connected to the pressure oil passage 51, and the third oil outlet 55 is connected to the second oil inlet 311.

[0065] As a preferred technical solution in this embodiment, the cone valve core 41 is provided with a second flow hole 411, and the cavity where the third elastic element 42 is located is connected to the third oil outlet 55 through the second flow hole 411, so that the oil can only flow from the third oil inlet 54 to the third oil outlet 55, and cannot flow in the reverse direction.

[0066] The first elastic element 23, the second elastic element 24, the third elastic element 42, the fourth elastic element 33, and the fifth elastic element 63 are all optional, but not limited to springs.

[0067] like Figure 2-12 As shown, this embodiment also provides a hydraulic system, including the aforementioned flow-through valve assembly, a first valve body 5, and an actuator. A pressure oil passage 51 is provided within the first valve body 5 for introducing pressure oil. A parallel oil passage 1 is also provided within the first valve body 5. The inlet ends of both the first oil passage 11 and the second oil passage 12 are connected to the pressure oil passage 51. The pressure oil passage 51 supplies oil to the actuator through the flow-through valve assembly.

[0068] As a preferred embodiment, the system further includes a control valve 7, which is inserted into the first valve body 5. The pressure oil passage 51 supplies oil to the control valve 7 through a flow valve assembly, and the control valve 7 then controls the oil inlet and outlet of the actuator. Specifically, the first oil outlet 53 and the second oil outlet 312 are both connected to the oil inlet of the control valve 7.

[0069] As a preferred embodiment, multiple control valves 7 and actuators can be configured, with each control valve 7 corresponding to the actuator, and each control valve 7 controlling the oil flow to and from the corresponding actuator. Pressure oil passage 51 supplies oil to the control valves 7, and a flow-through valve group is provided between the pressure oil passage 51 and some of the control valves 7; alternatively, a flow-through valve group is provided between the pressure oil passage 51 and each control valve 7.

[0070] Based on the above structure, in the hydraulic system of this embodiment, when the whole machine operates independently, neither the first valve 2 nor the second valve 3 is subjected to pilot pressure, and both have a large opening area to ensure sufficient flow capacity. Among them, the first valve 2 has a larger opening area, and the flow capacity is mainly guaranteed by the first valve 2. When the whole machine operates in combination, a fixed pilot pressure is applied to the pilot valve 6 of the first valve 2, so that the opening area of ​​the first valve 2 is a fixed small area. A variable pilot pressure is applied to the second valve 3, so that its opening area can be adjusted to any value within a certain range, thereby achieving coordination of combination actions under different conditions and realizing fine adjustment of the combination actions of the whole machine.

[0071] Example 2

[0072] like Figure 13-15 As shown, the flow valve assembly and hydraulic system of this embodiment are basically the same as those of Embodiment 1, except that the first valve 2 controls the first oil circuit 11 to have two states: large-opening flow and cut-off. In the initial state, the first valve 2 is in the large-opening flow state under the action of the first elastic element 23. When the pilot valve 6 is switched, the first valve 2 cuts off the connection between the first oil inlet 52 and the first oil outlet 53. In terms of specific structure, the first flow hole 211 on the outer cone valve core 21 of this embodiment is eliminated.

[0073] Based on the above structure, the hydraulic system of this embodiment, as follows: Figure 14-15 As shown, when the machine operates independently, neither the first valve 2 nor the second valve 3 is subjected to pilot pressure, and both have large opening areas to ensure sufficient flow capacity. The first valve 2 has a larger opening area, and its flow capacity is mainly guaranteed by the first valve 2. When the machine operates in combination, a fixed pilot pressure is applied to the pilot valve 6 of the first valve 2, making its opening area zero. A variable pilot pressure is applied to the second valve 3, allowing its opening area to be adjusted to any value within a certain range. This achieves coordination of the combined operation under different conditions and enables fine adjustment of the combined operation of the machine.

[0074] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A flow-through valve assembly, characterized in that, include: Parallel oil circuit (1), wherein the parallel oil circuit (1) includes a first oil circuit (11) and a second oil circuit (12) arranged in parallel. The first valve (2) is located on the first oil passage (11) and controls the discontinuous change of the flow area of ​​the first oil passage (11). The second valve (3) is located on the second oil passage (12) and controls the continuous change of the flow area of ​​the second oil passage (12).

2. The flow valve assembly according to claim 1, characterized in that, The first valve (2) controls the first oil circuit (11) to have two states: large opening flow and cut-off; or, the first valve (2) controls the first oil circuit (11) to have two states: large opening flow and small opening flow.

3. The flow valve assembly according to claim 1, characterized in that, The first valve (2) includes an outer cone valve core (21) and an inner cone valve core (22). The outer cone valve core (21) is slidably assembled in the first valve body (5). In the initial state, the outer cone valve core (21) abuts against the inner wall of the first valve body (5) under the action of the first elastic member (23) to block the communication between the first oil inlet (52) and the first oil outlet (53). The inner cone valve core (22) is slidably assembled in the outer cone valve core (21) and abuts against the inner wall of the outer cone valve core (21) under the action of the second elastic member (24).

4. A flow valve assembly according to claim 3, characterized in that, The cavity where the first elastic element (23) is located is the control cavity (26). The pilot valve (6) controls the oil to enter the control cavity (26). When the pilot valve (6) is in the first position, the first oil outlet (53) is connected to the control cavity (26) through the pilot valve (6). When the pilot valve (6) is in the second position, the pressure oil in the first oil inlet (52) pushes open the inner cone valve core (22) and enters the control cavity (26).

5. A flow valve assembly according to any one of claims 3-4, characterized in that, The outer cone valve core (21) is provided with a first flow passage (211), which is connected to the first oil outlet (53). After the pressure oil from the first oil inlet (52) opens the inner cone valve core (22), it enters the first oil outlet (53) through the first flow passage (211).

6. A flow valve assembly according to claim 1, characterized in that, The second valve (3) is a slide valve structure. The second valve (3) includes a valve core (32) and a second valve body (31). The valve core (32) is slidably assembled in the second valve body (31). The second valve body (31) is provided with a second oil inlet (311) and a second oil outlet (312). The valve core (32) compresses the fourth elastic element (33) under the action of the pilot oil to slide, so as to control the opening degree between the second oil inlet (311) and the second oil outlet (312).

7. A flow valve assembly according to claim 1, characterized in that, The second oil circuit (12) is also equipped with a check valve (4).

8. A flow valve assembly according to claim 7, characterized in that, The one-way valve (4) includes a cone valve core (41), which is slidably mounted on the first valve body (5). In the initial state, the cone valve core (41) abuts against the inner wall of the first valve body (5) under the action of the third elastic element (42), blocking the communication between the third oil inlet (54) and the third oil outlet (55). A second flow hole (411) is formed on the cone valve core (41), and the cavity where the third elastic element (42) is located is connected to the third oil outlet (55) through the second flow hole (411).

9. A hydraulic system, characterized in that, include: First valve body (5), and pressure oil passage (51) is provided inside the first valve body (5); The flow valve assembly according to any one of claims 1-8, wherein the flow valve assembly is mounted on the first valve body (5); The pressure oil in the pressure oil passage (51) of the actuator is supplied to the actuator through the flow valve group.

10. A hydraulic system according to claim 9, characterized in that, It also includes a control valve (7), and the pressure oil in the pressure oil passage (51) is supplied to the control valve (7) through the flow valve group. The control valve (7) controls the oil inlet and outlet of the actuator.

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