Hydraulic control system and working machine

Abstract

The application relates to the technical field of working machines, and discloses a hydraulic control system and a working machine. A control valve group comprises an implement main valve and a standby valve, an oil pump assembly comprises a first oil pump and a second oil pump, the oil outlet end of the first oil pump is communicated with the first side oil port of the standby valve, and the oil outlet end of the second oil pump is communicated with the first side oil port of the implement main valve. A working oil circuit comprises a first working oil circuit and a second working oil circuit, the first working oil circuit is communicated with the second side oil port of the standby valve, the second working oil circuit is communicated with the second side oil port of the implement main valve, and a confluence oil circuit is used for confluencing the first working oil circuit and the second working oil circuit and driving the implement to act. In the embodiment, when it is required to deliver hydraulic oil to the implement, the hydraulic oil in the first working oil circuit and the second working oil circuit can be merged and delivered to the implement through the confluence oil circuit, the implement power is sufficient, the implement can efficiently act, and the implement efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of construction machinery technology, specifically relating to a hydraulic control system and construction machinery. Background Technology

[0002] In the prior art, since the hydraulic oil tank is usually connected to multiple actuators to supply hydraulic oil, the hydraulic oil is divided into multiple channels and delivered to multiple actuators respectively. When multiple actuators operate at the same time, the critical actuator is prone to insufficient hydraulic oil supply. In this case, the critical actuator has low operating efficiency and there is a technical problem of insufficient power. Summary of the Invention

[0003] The purpose of this invention is to provide a hydraulic control system and working machinery to solve the technical problems of low efficiency and insufficient power of key actuators in the prior art.

[0004] To achieve the above objectives, the present invention provides a hydraulic control system, the hydraulic control system comprising:

[0005] Control valve assembly, including main valve and standby valve as actuators;

[0006] The oil pump assembly includes a first oil pump and a second oil pump. The oil outlet of the first oil pump is connected to the first side oil port of the standby valve, and the oil outlet of the second oil pump is connected to the first side oil port of the main valve of the actuator.

[0007] The working oil circuit includes a first working oil circuit and a second working oil circuit. The first working oil circuit is connected to the second side oil port of the standby valve, and the second working oil circuit is connected to the second side oil port of the main valve of the actuator.

[0008] The merging oil circuit is used to combine the first working oil circuit and the second working oil circuit to drive the actuator.

[0009] In an embodiment of this utility model, the hydraulic control system further includes a pilot oil circuit, and the control valve group further includes a first solenoid valve and a second solenoid valve disposed on the pilot oil circuit. The number of the first solenoid valve and the second solenoid valve is at least one. One oil port of the first solenoid valve is connected to a standby valve, and one oil port of the second solenoid valve is connected to the main valve of the actuator.

[0010] In an embodiment of this utility model, the hydraulic control system further includes a control unit. The control unit is electrically connected to both the first solenoid valve and the second solenoid valve. The control unit is used to control the first solenoid valve to be energized or de-energized so as to open or close the pilot oil circuit. The control unit is also used to control the second solenoid valve to be energized or de-energized so as to open or close the pilot oil circuit.

[0011] In an embodiment of this utility model, the hydraulic control system further includes a bypass oil circuit connected to the pilot oil circuit. A shut-off valve core and a shut-off solenoid valve are provided on the bypass oil circuit, and the control unit is used to control the on / off state of the shut-off solenoid valve.

[0012] In an embodiment of this utility model, the hydraulic control system further includes a safety oil circuit, and a safety valve is provided on the pilot oil circuit. The safety valve is used to control the connection or disconnection between the safety oil circuit and the pilot oil circuit.

[0013] In an embodiment of this utility model, the hydraulic control system further includes a hydraulic oil tank connected to the pilot oil circuit, and a pilot pump is also provided on the pilot oil circuit, with the pilot pump located between the safety valve and the hydraulic oil tank.

[0014] In an embodiment of this utility model, the hydraulic control system further includes an engine, which is drivenly connected to the first oil pump, the second oil pump, and the pilot pump.

[0015] In the embodiments of this utility model, there are two first solenoid valves and two second solenoid valves. One oil port of one first solenoid valve is connected to one end of the standby valve, and one oil port of the other first solenoid valve is connected to the other end of the standby valve. One oil port of one second solenoid valve is connected to one end of the main valve of the actuator, and one oil port of the other second solenoid valve is connected to the other end of the main valve of the actuator.

[0016] In embodiments of this utility model, the first working oil circuit, the second working oil circuit, and the confluence oil circuit are all located outside the control valve assembly.

[0017] In an embodiment of this utility model, a working machine is also proposed, including the hydraulic control system described above.

[0018] Through the above technical solutions, the hydraulic control system and operating machinery provided by the embodiments of this utility model have the following beneficial effects:

[0019] The hydraulic control system of this application includes a control valve group, an oil pump assembly, a working oil circuit, and a confluence oil circuit. The control valve group includes a main valve and a standby valve for the actuator. The oil pump assembly includes a first oil pump and a second oil pump. The outlet of the first oil pump is connected to the first side port of the standby valve, and the outlet of the second oil pump is connected to the first side port of the main valve for the actuator. The working oil circuit includes a first working oil circuit and a second working oil circuit. The first working oil circuit is connected to the second side port of the standby valve, and the second working oil circuit is connected to the second side port of the main valve for the actuator. The confluence oil circuit is used to combine the first and second working oil circuits to drive the actuator. In this embodiment, the hydraulic control system, by setting a standby valve in conjunction with the main valve for the actuator to control the on / off of different oil circuits, ensures that when hydraulic oil needs to be supplied to the actuator, the hydraulic oil in the first and second working oil circuits can be combined through the confluence oil circuit, and the combined hydraulic oil is delivered to the actuator together. The actuator has sufficient power and can perform actions efficiently, thereby improving the execution efficiency of the actuator.

[0020] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. Those skilled in the art can obtain other drawings based on the structures shown in these drawings without any inventive effort. In the drawings:

[0022] Figure 1 This is a schematic diagram of the hydraulic control system according to the present invention.

[0023] Explanation of reference numerals in the attached figures

[0024] Detailed Implementation

[0025] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0026] The hydraulic control system and working machinery according to the present invention are described below with reference to the accompanying drawings.

[0027] like Figure 1As shown, the hydraulic control system of this application includes a control valve group, an oil pump assembly, a working oil circuit, and a confluence oil circuit 4. The control valve group includes a main actuator valve 11 and a standby valve 12. The oil pump assembly includes a first oil pump 21 and a second oil pump 22. The oil outlet of the first oil pump 21 is connected to the first side oil port of the standby valve 12, and the oil outlet of the second oil pump 22 is connected to the first side oil port of the main actuator valve 11. The working oil circuit includes a first working oil circuit 31 and a second working oil circuit 32. The first working oil circuit 31 is connected to the second side oil port of the standby valve 12, and the second working oil circuit 32 is connected to the second side oil port of the main actuator valve 11. The confluence oil circuit 4 is used to combine the first working oil circuit 31 and the second working oil circuit 32 to drive the actuator 20. In this embodiment, the hydraulic control system uses a spare valve 12 to work with the main valve 11 of the actuator to control the opening and closing of different oil circuits. This ensures that when hydraulic oil needs to be supplied to the actuator 20, the hydraulic oil in the first working oil circuit 31 and the second working oil circuit 32 can be combined through the confluence oil circuit 4 and the combined hydraulic oil is delivered to the actuator 20. The actuator 20 has sufficient power and can perform actions efficiently, thereby improving the execution efficiency of the actuator 20. The hydraulic control system of this embodiment can ensure that the actuator 20 has sufficient power and can operate continuously and stably.

[0028] It should be noted that the actuator 20 in this application is described using a bucket cylinder as an example. The bucket is usually driven by a bucket cylinder. In the prior art, the movement of the bucket is usually accompanied by the movement of the boom and stick. Therefore, hydraulic oil needs to be supplied to the bucket, boom, and stick simultaneously. Since there are branch oil lines in the hydraulic oil line that delivers the hydraulic oil to the bucket in the prior art, some hydraulic oil will be delivered from the branch oil lines to the boom and stick. Therefore, there is often a technical problem of insufficient hydraulic oil delivered to the bucket.

[0029] The hydraulic control system also includes a pilot oil circuit 5, and the control valve group also includes a first solenoid valve and a second solenoid valve disposed on the pilot oil circuit 5. The number of the first solenoid valve and the second solenoid valve is at least one. In one embodiment, the number of the first solenoid valve and the second solenoid valve is one. One oil port of the first solenoid valve is connected to the standby valve 12, and one oil port of the second solenoid valve is connected to the main valve 11 of the actuator. By controlling the opening and closing of the first solenoid valve, the working position of the valve core of the standby valve 12 can be adjusted. Similarly, by controlling the opening and closing of the second solenoid valve, the working position of the valve core of the main valve 11 of the actuator can be adjusted.

[0030] In another embodiment, there are two of each of the first and second solenoid valves, such as... Figure 1As shown, one oil port of one first solenoid valve is connected to one end of the standby valve 12, and one oil port of another first solenoid valve is connected to the other end of the standby valve 12. One oil port of one second solenoid valve is connected to one end of the main valve 11 of the actuator, and one oil port of another second solenoid valve is connected to the other end of the main valve 11 of the actuator. The two first solenoid valves are divided into first solenoid valve 13a and first solenoid valve 13b, and the two second solenoid valves are divided into second solenoid valve 14a and second solenoid valve 14b.

[0031] Specifically, the bucket cylinder is divided into a rod-side chamber and a rodless chamber. The first working oil circuit 31 and the second working oil circuit 32 are both connected to the rodless chamber of the bucket cylinder via a confluence oil circuit 4. Additionally, the hydraulic control system includes a third working oil circuit 33 and a fourth working oil circuit 34. The first end of both the third working oil circuit 33 and the fourth working oil circuit 34 is connected to the rod-side chamber of the bucket cylinder. The second end of the third working oil circuit 33 is connected to the hydraulic oil tank 30 via a spare valve 12, and the second end of the fourth working oil circuit 34 is connected to the hydraulic oil tank 30 via the actuator main valve 11. The hydraulic control system also includes a hydraulic oil tank 30. A first delivery oil circuit 35 is provided between the spare valve 12 and the hydraulic oil tank 30, and a second delivery oil circuit 36 ​​is provided between the actuator main valve 11 and the hydraulic oil tank 30. A first oil pump 21 is located on the first delivery oil circuit 35, and a second oil pump 22 is located on the second delivery oil circuit 36.

[0032] like Figure 1 As shown, in the confluence operation, when the bucket cylinder needs to extend, the control unit drives the first solenoid valve 13a, which is connected to the left end of the backup valve 12, to be energized. At this time, the pilot oil circuit 5 is in the conducting state and drives the backup valve 12 to switch to the left working position. The first delivery oil circuit 35 is connected to the first working oil circuit 31, and the hydraulic oil can enter the first working oil circuit 31 from the hydraulic oil tank 30. Similarly, the control unit drives the second solenoid valve 14a, which is connected to the left end of the actuator main valve 11, to be energized. At this time, the actuator main valve 11 is driven to switch to the left working position, and the hydraulic oil can enter the second working oil circuit 32 from the actuator main valve 11. Then, the hydraulic oil in the first working oil circuit 31 and the second working oil circuit 32 can be transported to the rodless chamber of the bucket cylinder through the confluence oil circuit 4, thereby driving the bucket cylinder to extend and thus driving the bucket to perform the action. At this time, the hydraulic oil in the rod chamber will be transported to the hydraulic oil tank 30 through the third working oil circuit 33 and the fourth working oil circuit 34.

[0033] When the bucket cylinder needs to retract, the control unit energizes the first solenoid valve 13b, which is connected to the right end of the backup valve 12. At this time, the pilot oil circuit 5 is open, driving the backup valve 12 to switch to the right-side position. The first delivery oil circuit 35 connects to the third working oil circuit 33. Simultaneously, the control unit energizes the second solenoid valve 14b, which is connected to the right end of the actuator main valve 11, causing the actuator main valve 11 to switch to the right-side position. The second delivery oil circuit 36 ​​connects to the fourth working oil circuit 34. The hydraulic oil in the hydraulic tank 30 merges from the third working oil circuit 33 and the fourth working oil circuit 34 and is delivered to the rod chamber of the bucket cylinder, thereby causing the bucket cylinder to retract. Meanwhile, the hydraulic oil in the rodless chamber of the bucket cylinder can be delivered from the merging oil circuit 4 to the first working oil circuit 31 and the second working oil circuit 32, and then enter the hydraulic tank 30 through the first working oil circuit 31 and the second working oil circuit 32, respectively. It should be noted that under merging conditions, the hydraulic oil supply is sufficient to stably drive the bucket cylinder to perform its actions.

[0034] In this embodiment, the hydraulic control system further includes a control unit. The control unit is electrically connected to each first solenoid valve and each second solenoid valve. The control unit is used to control the first solenoid valve to be energized or de-energized, so as to open or close the pilot oil circuit 5. The control unit is also used to control the second solenoid valve to be energized or de-energized, so as to open or close the pilot oil circuit 5. It should be noted that under normal conditions, each first solenoid valve and each second solenoid valve is in the open state. They are only energized and opened upon receiving a signal command from the control unit, so as to sensitively control the opening and closing of the main valve 11 and the standby valve 12 of the actuator.

[0035] Additionally, in non-merging operation conditions, suitable for situations where the bucket does not require excessive hydraulic oil drive, when the bucket cylinder needs to extend, the control unit can energize only the second solenoid valve 14a, which is connected to the left end of the main valve 11 of the actuator. This switches the main valve 11 to the left position, allowing hydraulic oil to enter the second working oil circuit 32 from the main valve 11 and then be delivered to the rodless chamber of the bucket cylinder via the merging oil circuit 4, thereby driving the bucket cylinder to extend and actuate the bucket. Meanwhile, the hydraulic oil in the rod chamber is delivered to the hydraulic oil tank 30 via the fourth working oil circuit 34.

[0036] When the bucket cylinder needs to retract, the control unit can energize the second solenoid valve 14b, which is connected to the right end of the main valve 11 of the actuator, causing the main valve 11 to switch to the right-side position. At this time, the second delivery oil circuit 36 ​​and the fourth working oil circuit 34 are connected. The hydraulic oil in the hydraulic oil tank 30 is combined from the fourth working oil circuit 34 and delivered to the rod chamber of the bucket cylinder, thereby driving the bucket cylinder to retract. At this time, the hydraulic oil in the rodless chamber of the bucket cylinder can be delivered from the confluence oil circuit 4 to the second working oil circuit 32, and then delivered to the hydraulic oil tank 30 through the second working oil circuit 32.

[0037] In this embodiment, the hydraulic control system further includes a bypass oil circuit 53 connected to the pilot oil circuit 5. The bypass oil circuit 53 is equipped with a shut-off valve core 71 and a shut-off solenoid valve 72. There are two shut-off solenoid valves 72, each connected to the left and right ports of the shut-off valve core 71, respectively. The control unit is connected to the shut-off solenoid valve 72 and is used to control the on / off state of the shut-off solenoid valve 72.

[0038] Specifically, the hydraulic control system also includes a drain oil circuit 6. One end of the drain oil circuit 6 is connected to the hydraulic oil tank 30, and the other end is connected to the bypass oil circuit 53. Under normal conditions, the shut-off solenoid valve 72 is in the open state. When the control module controls the shut-off solenoid valve 72, which is connected to the left end of the shut-off valve core 71, to be energized, the shut-off solenoid valve 72 closes and connects the bypass oil circuit 53 to the pilot oil circuit 5, and drives the shut-off valve core 71 to switch to the left working position. At this time, the bypass oil circuit 53 is disconnected from the drain oil circuit 6, and the hydraulic oil in the pilot oil circuit 5 will not return to the hydraulic oil tank 30 through the drain oil circuit 6 via the bypass oil circuit 53. When the bucket cylinder needs to retract, the control module can energize the solenoid valve 72 connected to the right end of the cut-off valve core 71. The solenoid valve 72 closes and connects the side branch oil circuit 53 with the pilot oil circuit 5, and drives the cut-off valve core 71 to switch to the right position. At this time, the side branch oil circuit 53 is connected to the drain oil circuit 6, and the hydraulic oil in the pilot oil circuit 5 can return to the hydraulic oil tank 30 through the side branch oil circuit 53 and the drain oil circuit 6.

[0039] like Figure 1 As shown, in this embodiment, the hydraulic control system also includes a hydraulic oil tank 30 connected to the pilot oil circuit 5. A pilot pump 52 is also installed on the pilot oil circuit 5, and the pilot pump 52 is located between the safety valve 51 and the hydraulic oil tank 30. In addition, a check valve 10 is provided between the pilot pump 52 and the safety valve 51 to prevent hydraulic oil from flowing directly back into the pilot pump 52 and causing damage to the pilot pump 52.

[0040] like Figure 1As shown, in this embodiment, the hydraulic control system also includes a safety oil circuit 8, and a safety valve 51 is also provided on the pilot oil circuit 5. The safety valve 51 is used to control the connection or disconnection between the safety oil circuit 8 and the pilot oil circuit 5. When the hydraulic control system malfunctions, the hydraulic oil in the first working oil circuit 31 and the second working oil circuit 32 may flow back from the pilot oil circuit 5 to the safety valve 51. When the pressure at the safety valve 51 is greater than the preset pressure, the safety valve 51 connects the safety oil circuit 8 to the pilot oil circuit 5, and the hydraulic oil can be discharged from the safety oil circuit 8, avoiding damage to the components in the hydraulic control system (such as avoiding damage to the check valve 10). When the pressure at the safety valve 51 is less than the preset pressure, the safety oil circuit 8 can be disconnected from the pilot oil circuit 5. The preset pressure value at the safety valve 51 can be adjusted according to actual needs.

[0041] like Figure 1 As shown, in this embodiment, the hydraulic control system also includes an engine 9, which is driven by the first oil pump 21, the second oil pump 22, and the pilot pump 52. The first oil pump 21, the second oil pump 22, and the pilot pump 52 are all connected in series in the oil circuit and driven by the engine 9 to ensure that the hydraulic oil can be efficiently transported along the oil circuit.

[0042] like Figure 1 As shown, in this embodiment, two first solenoid valves are connected in parallel, and two second solenoid valves are connected in parallel to ensure that each first solenoid valve and each second solenoid valve can accurately respond to the commands of the control unit.

[0043] In this embodiment, the hydraulic oil in the first working oil circuit 31 and the second working oil circuit 32 flows in the same direction, ensuring that a sufficient amount of hydraulic oil can be delivered to the actuator 20. This also ensures that the hydraulic oil at the actuator 20 is smoothly delivered from the first working oil circuit 31 and the second working oil circuit 32 to the hydraulic oil tank 30, ensuring that the bucket cylinder can extend and retract efficiently and improving the bucket's working efficiency. Furthermore, the first working oil circuit 31, the second working oil circuit 32, and the confluence oil circuit 4 are all located outside the control valve assembly. The hydraulic oil in the first working oil circuit 31 and the second working oil circuit 32 does not need to flow through the shut-off valve core 71, thus avoiding the situation where some hydraulic oil flows directly from the shut-off valve core 71 into the hydraulic oil tank 30, resulting in insufficient hydraulic oil delivered to the bucket cylinder.

[0044] In this embodiment, a working machine is also proposed, including the hydraulic control system described above. Since the working machine employs all embodiments of the hydraulic control system in this application, it also possesses all the beneficial effects of a working machine, which will not be elaborated upon here. The working machine can be an excavator; specifically, this embodiment focuses on an excavator, studying how to drive the bucket for efficient operation. By employing the hydraulic control system of this application, the bucket can be efficiently controlled for operation.

[0045] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of 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.

[0046] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0047] 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.

[0048] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A hydraulic control system, characterized in that, The hydraulic control system includes: The control valve assembly includes the main valve (11) and the standby valve (12) of the actuator. The oil pump assembly includes a first oil pump (21) and a second oil pump (22). The oil outlet of the first oil pump (21) is connected to the first side oil port of the backup valve (12), and the oil outlet of the second oil pump (22) is connected to the first side oil port of the actuator main valve (11). The working oil circuit includes a first working oil circuit (31) and a second working oil circuit (32). The first working oil circuit (31) is connected to the second side oil port of the standby valve (12), and the second working oil circuit (32) is connected to the second side oil port of the actuator main valve (11). The confluence oil passage (4) is used to combine the first working oil passage (31) and the second working oil passage (32) and to drive the actuator (20) to move.

2. The hydraulic control system according to claim 1, characterized in that, The hydraulic control system further includes a pilot oil circuit (5), and the control valve group further includes a first solenoid valve (13) and a second solenoid valve (14) disposed on the pilot oil circuit (5). The number of the first solenoid valve (13) and the second solenoid valve (14) is at least one. One side port of the first solenoid valve (13) is connected to the standby valve (12), and one side port of the second solenoid valve (14) is connected to the main valve (11) of the actuator.

3. The hydraulic control system according to claim 2, characterized in that, The hydraulic control system also includes a control unit, which is electrically connected to both the first solenoid valve (13) and the second solenoid valve (14). The control unit is used to control the first solenoid valve (13) to be energized or de-energized so that the pilot oil circuit (5) is opened or closed. The control unit is also used to control the second solenoid valve (14) to be energized or de-energized so that the pilot oil circuit (5) is opened or closed.

4. The hydraulic control system according to claim 3, characterized in that, The hydraulic control system also includes a bypass oil circuit (53) connected to the pilot oil circuit (5). The bypass oil circuit (53) is provided with a shut-off valve core (71) and a shut-off solenoid valve (72). The control unit is used to control the opening and closing of the shut-off solenoid valve (72).

5. The hydraulic control system according to claim 3, characterized in that, The hydraulic control system also includes a safety oil circuit (8), and a safety valve (51) is provided on the pilot oil circuit (5). The safety valve (51) is used to control the connection or disconnection between the safety oil circuit (8) and the pilot oil circuit (5).

6. The hydraulic control system according to claim 5, characterized in that, The hydraulic control system also includes a hydraulic oil tank (30) connected to the pilot oil circuit (5), and a pilot pump (52) is also provided on the pilot oil circuit (5). The pilot pump (52) is located between the safety valve (51) and the hydraulic oil tank (30).

7. The hydraulic control system according to claim 6, characterized in that, The hydraulic control system also includes an engine (9), which is driven by the first oil pump (21), the second oil pump (22) and the pilot pump (52).

8. The hydraulic control system according to claim 2, characterized in that, There are two of each of the first solenoid valve (13) and the second solenoid valve (14). One of the oil ports of the first solenoid valve (13) is connected to one end of the backup valve (12), and the other of the first solenoid valve (13) is connected to the other end of the backup valve (12). One of the oil ports of the second solenoid valve (14) is connected to one end of the main valve (11) of the actuator, and the other of the second solenoid valve (14) is connected to the other end of the main valve (11) of the actuator.

9. The hydraulic control system according to any one of claims 1 to 8, characterized in that, The first working oil circuit (31), the second working oil circuit (32) and the confluence oil circuit (4) are all located outside the control valve group.

10. A type of operating machinery, characterized in that, Includes a hydraulic control system according to any one of claims 1 to 9.

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