Hydraulic control system and excavator

Abstract

The utility model discloses a hydraulic control system and an excavator. The hydraulic control system comprises a main hydraulic module, a switching module, a first oil cylinder and a second oil cylinder. The main hydraulic module provides main hydraulic oil, and the switching module switches the conduction of an oil way between the first oil cylinder and the main hydraulic module or switches the conduction of an oil way between the second oil cylinder and the main hydraulic module according to a switching signal; the first oil cylinder starts a first action function according to the main hydraulic oil, and the second oil cylinder starts a second action function according to the main hydraulic oil. According to the hydraulic control system and the excavator, the switching module can be used for controlling whether the main hydraulic module is communicated with the oil way channel between the first oil cylinder and the second oil cylinder or not, so that the two oil cylinders share the same main hydraulic module, and the two oil cylinders do not need to be provided with corresponding main hydraulic modules respectively; therefore, the layout integration level of the hydraulic control system is improved, and the space, occupied by the hydraulic control system, of the excavator is reduced.

Description

A hydraulic control system and an excavator Technical Field

[0001] This utility model relates to the field of hydraulic control technology, and in particular to a hydraulic control system and an excavator. Background Technology

[0002] Currently, each action on an excavator is equipped with a corresponding hydraulic cylinder, and different hydraulic cylinders are connected to corresponding directional valves. The directional valve is controlled by the pressure of the pilot hydraulic system, which enables the pressure of the main hydraulic system to drive the corresponding hydraulic cylinder, thereby enabling the excavator to perform the corresponding action.

[0003] However, in actual operation, different cylinders require corresponding directional valves, and these directional valves, in turn, require corresponding pilot hydraulic devices and connecting pipelines. This results in low integration of the hydraulic control system layout and a large space occupation on the excavator. Therefore, improving the integration of the hydraulic control system layout to reduce its space occupation on the excavator has become an urgent problem to be solved. Summary of the Invention

[0004] This utility model discloses a hydraulic control system and an excavator, which can improve the layout integration of the hydraulic control system, thereby reducing the space occupied by the hydraulic control system in the excavator.

[0005] To achieve the above objectives, in a first aspect, this utility model discloses a hydraulic control system, the system comprising:

[0006] The main hydraulic module is used to provide main hydraulic oil;

[0007] A switching module, wherein the switching module is connected to the main hydraulic module's oil circuit;

[0008] The first hydraulic cylinder is connected to the hydraulic circuit of the switching module;

[0009] The second hydraulic cylinder is connected to the hydraulic circuit of the switching module.

[0010] The switching module is used to switch the oil circuit connection between the first oil cylinder and the main hydraulic module, or to switch the oil circuit connection between the second oil cylinder and the main hydraulic module, according to the switching signal; the first oil cylinder is used to start a first action function according to the main hydraulic oil, and the second oil cylinder is used to start a second action function according to the main hydraulic oil.

[0011] As an optional implementation, in an embodiment of the first aspect of this utility model, the system further includes a pilot hydraulic module, and the switching module includes:

[0012] A switching valve, wherein the oil inlet of the switching valve is connected to the oil circuit of the main hydraulic module, the first oil outlet of the switching valve is connected to the oil circuit of the first cylinder, and the second oil outlet of the switching valve is connected to the oil circuit of the second cylinder.

[0013] A solenoid valve, which is connected to the pressure receiving end of the pilot hydraulic module and the switching valve respectively;

[0014] The pilot hydraulic module is used to provide pilot hydraulic oil, the solenoid valve is used to open or close the oil passage between the pilot hydraulic module and the switching valve according to the switching signal, and the switching valve is used to switch the oil passage between the first cylinder or the second cylinder and the main hydraulic module according to the pilot hydraulic oil.

[0015] As an optional implementation, in an embodiment of the first aspect of this utility model, the main hydraulic module includes:

[0016] The main hydraulic pump is used to supply main hydraulic oil;

[0017] A directional control valve is provided, wherein the inlet end of the directional control valve is connected to the oil circuit of the main hydraulic pump, the outlet end of the directional control valve is connected to the oil circuit of the inlet end of the switching valve, and the pressure receiving end of the directional control valve is connected to the pilot hydraulic module. The directional control valve is used to open or close according to the pilot hydraulic oil.

[0018] As an optional implementation, in an embodiment of the first aspect of this utility model, the system further includes:

[0019] A high-pressure protection module is connected to the oil outlet and the oil return of the directional valve, respectively. The high-pressure protection module is used to transport the overpressure hydraulic oil discharged from the oil outlet of the directional valve to the oil return of the directional valve.

[0020] As an optional implementation, in an embodiment of the first aspect of this utility model, the high-voltage protection module includes:

[0021] The first oil port relief valve has its inlet end connected to the first oil outlet end of the directional valve, and its outlet end connected to the return oil end of the directional valve. The first oil port relief valve is used to deliver the overpressure hydraulic oil discharged by the directional valve to the return oil end of the directional valve.

[0022] As an optional implementation, in an embodiment of the first aspect of this utility model, the high-voltage protection module includes:

[0023] The second oil port relief valve has its inlet end connected to the second outlet oil circuit of the directional valve, and its outlet end connected to the return oil circuit of the directional valve. The second oil port relief valve is used to transport the overpressure hydraulic oil discharged by the directional valve to the return oil circuit of the directional valve.

[0024] As an optional implementation, in an embodiment of the first aspect of this utility model, the pilot hydraulic module includes: a pilot pump, which is connected to the oil circuits of the solenoid valve and the directional valve respectively, and the pilot pump is used to provide the pilot hydraulic oil.

[0025] As an optional implementation, in an embodiment of the first aspect of this utility model, the pilot hydraulic module further includes: a pilot valve, which is connected to the pilot pump, the solenoid valve and the directional valve oil circuit respectively, and the pilot valve is used to switch the oil circuit passage between the pilot pump and the solenoid valve and / or the directional valve respectively to be open or closed according to the pilot control signal.

[0026] As an optional implementation, the first cylinder is used to activate the boom movement function according to the main hydraulic oil, and the second cylinder is used to activate the bulldozer blade movement function according to the main hydraulic oil.

[0027] Secondly, this utility model discloses an excavator, characterized in that the excavator comprises:

[0028] First action execution device;

[0029] Second action execution device;

[0030] As described in the first aspect of the present invention, in the hydraulic control system, the first cylinder is connected to the first action execution device, and the second cylinder is connected to the second action execution device. The first cylinder is used to control the first action execution device to perform a first action according to the main hydraulic oil, and the second cylinder is used to control the second action execution device to perform a second action according to the main hydraulic oil.

[0031] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0032] The hydraulic control system provided by this utility model can control whether the oil passage between the main hydraulic module and the first and second oil cylinders is connected by a switching module, so that the two oil cylinders can share the same main hydraulic module. There is no need to configure a separate main hydraulic module for each of the two oil cylinders, thereby improving the layout integration of the hydraulic control system and reducing the space occupied by the hydraulic control system on the excavator. At the same time, since the required main hydraulic module and corresponding pipeline lines are reduced, the cost of the hydraulic control system is also reduced.

[0033] The excavator provided by this utility model adopts the above-mentioned hydraulic control system. By switching the module, it controls whether the oil passage between the main hydraulic module and the first and second oil cylinders are connected, so that the two oil cylinders share the same main hydraulic module. There is no need to configure a separate main hydraulic module for each of the two oil cylinders. This improves the layout integration of the hydraulic control system, thereby reducing the space occupied by the hydraulic control system in the excavator. At the same time, since the required main hydraulic module and corresponding pipeline lines are reduced, the cost of the excavator is also reduced. Attached Figure Description

[0034] Figure 1 is a block diagram of a specific embodiment of the hydraulic control system of this utility model;

[0035] Figure 2 is a schematic diagram of a specific embodiment of the hydraulic control system of this utility model.

[0036] The meanings of the reference numerals in the attached figures are as follows:

[0037] Main hydraulic module 100, main hydraulic pump 110, directional valve 120, switching module 200, switching valve 210, solenoid valve 220, first cylinder 300, second cylinder 400, pilot hydraulic module 500, high pressure protection module 600, first port relief valve 610, second port relief valve 620. Detailed Implementation

[0038] 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. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0040] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0041] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0042] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0043] The technical solution of this utility model will be further described below with reference to the embodiments and accompanying drawings.

[0044] Currently, each action on an excavator is equipped with a corresponding hydraulic cylinder, and different hydraulic cylinders are connected to corresponding directional valves. The directional valve is controlled by the pressure of the pilot hydraulic system, which enables the pressure of the main hydraulic system to drive the corresponding hydraulic cylinder, thereby enabling the excavator to perform the corresponding action.

[0045] However, in actual operation, different cylinders require corresponding directional valves, and these directional valves, in turn, require corresponding pilot hydraulic devices and connecting pipelines. This results in low integration of the hydraulic control system layout and a large space occupation on the excavator. Therefore, improving the integration of the hydraulic control system layout to reduce its space occupation on the excavator has become an urgent problem to be solved.

[0046] In response, this utility model discloses a hydraulic control system and an excavator, which can improve the layout integration of the hydraulic control system, thereby reducing the space occupied by the hydraulic control system in the excavator.

[0047] As shown in Figure 1, this utility model discloses a hydraulic control system, which includes: a main hydraulic module 100, a switching module 200, a first cylinder 300, and a second cylinder 400. The main hydraulic module 100 provides main hydraulic oil; the switching module 200 is connected to the main hydraulic module 100 by an oil circuit, the first cylinder 300 is connected to the switching module 200 by an oil circuit, and the second cylinder 400 is connected to the switching module 200 by an oil circuit; the switching module 200 is used to switch the oil circuit connection between the first cylinder 300 and the main hydraulic module 100, or to switch the oil circuit connection between the second cylinder 400 and the main hydraulic module 100, according to a switching signal; the first cylinder 300 is used to initiate a first action function based on the main hydraulic oil, and the second cylinder 400 is used to initiate a second action function based on the main hydraulic oil.

[0048] In this embodiment, when the first hydraulic cylinder 300 is moved by hydraulic pressure, the excavator's first action function is activated, thereby controlling the excavator to perform the first action. When the second hydraulic cylinder 400 is moved by hydraulic pressure, the excavator's second action function is activated, thereby controlling the excavator to perform the second action. The first and second actions are actions that the excavator will not perform simultaneously.

[0049] The switching module 200 is connected to the main hydraulic module 100, the first cylinder 300, and the second cylinder 400 respectively. After receiving the switching signal, the switching module 200 can switch the oil circuit connection between the main hydraulic module 100 and the first cylinder 300, or switch the oil circuit connection between the main hydraulic module 100 and the second cylinder 400.

[0050] When the hydraulic circuit between the main hydraulic module 100 and the first cylinder 300 is switched on, the main hydraulic oil provided by the main hydraulic module 100 can be delivered to the first cylinder 300, thereby driving the first cylinder 300 to move through the hydraulic pressure of the main hydraulic oil, thus activating the excavator's first action function. When the hydraulic circuit between the main hydraulic module 100 and the second cylinder 400 is switched on, the main hydraulic oil provided by the main hydraulic module 100 can be delivered to the second cylinder 400, thereby driving the second cylinder 400 to move through the hydraulic pressure of the main hydraulic oil, thus activating the excavator's second action function.

[0051] As can be seen, the hydraulic control system of this utility model can control whether the oil passage between the main hydraulic module 100 and the first oil cylinder 300 and the second oil cylinder 400 is connected through the switching module 200, so that the two oil cylinders share the same main hydraulic module 100. There is no need to configure a separate main hydraulic module 100 for each of the two oil cylinders. This improves the layout integration of the hydraulic control system, thereby reducing the space occupied by the hydraulic control system on the excavator. At the same time, since the required configuration of the main hydraulic module 100 and the corresponding pipeline lines are reduced, the cost of the hydraulic control system is also reduced.

[0052] As shown in Figure 2, in an optional embodiment, the hydraulic control system further includes a pilot hydraulic module 500, and the switching module 200 includes a switching valve 210 and a solenoid valve 220. The inlet of the switching valve 210 is connected to the oil circuit of the main hydraulic module 100, the first outlet of the switching valve 210 is connected to the oil circuit of the first cylinder 300, and the second outlet of the switching valve 210 is connected to the oil circuit of the second cylinder 400. The solenoid valve 220 is connected to the pressure receiving ends of the pilot hydraulic module 500 and the switching valve 210 respectively. The pilot hydraulic module 500 is used to provide pilot hydraulic oil, the solenoid valve 220 is used to open or close the oil circuit passage between the pilot hydraulic module 500 and the switching valve 210 according to the switching signal, and the switching valve 210 is used to switch the oil circuit connection between the first cylinder 300 or the second cylinder 400 and the main hydraulic module 100 according to the pilot hydraulic oil.

[0053] In this optional embodiment, the switching signal is a signal generated by the operator through control devices on the excavator, such as joysticks or control panels.

[0054] The main hydraulic module 100 is connected to the inlet oil circuit of the switching valve 210 so that the main hydraulic oil provided by the main hydraulic module 100 can be delivered to the inlet oil circuit of the switching valve 210. The first cylinder 300 is connected to the first outlet oil circuit of the switching valve 210, and the second cylinder 400 is connected to the second outlet oil circuit of the switching valve 210. When the oil circuit between the inlet oil circuit and the first outlet oil circuit of the switching valve 210 is open, the main hydraulic oil can be delivered to the first cylinder 300, and when the oil circuit between the inlet oil circuit and the second outlet oil circuit of the switching valve 210 is open, the main hydraulic oil can be delivered to the second cylinder 400. It is understood that the switching valve 210 will not simultaneously open the oil circuit between the inlet oil circuit and the first outlet oil circuit, or the oil circuit between the inlet oil circuit and the second outlet oil circuit.

[0055] The pilot hydraulic module 500 is connected to the solenoid valve 220 via an oil circuit, enabling the pilot hydraulic oil supplied by the pilot hydraulic module 500 to be delivered to the solenoid valve 220. The solenoid valve 220 is also connected to the pressure receiving end of the switching valve 210 via an oil circuit. When the solenoid valve 220 does not receive a switching signal, it is not energized and is in the closed position, meaning the oil circuit between the pilot hydraulic module 500 and the switching valve 210 is not open, and the pilot hydraulic oil supplied by the pilot hydraulic module 500 cannot reach the pressure receiving end of the switching valve 210 through the solenoid valve 220. When the operator sends a switching signal to the solenoid valve 220 by controlling the corresponding control device, the solenoid valve 220 is energized and is in the open position, meaning the oil circuit between the pilot hydraulic module 500 and the switching valve 210 is open, and the pilot hydraulic oil supplied by the pilot hydraulic module 500 can reach the pressure receiving end of the switching valve 210 through the solenoid valve 220.

[0056] The switching valve 210 can be a spring-loaded hydraulic switching valve 210. When the pressure receiving end of the switching valve 210 does not receive hydraulic pressure from the pilot hydraulic oil, the switching valve 210 is in the first conducting position due to the spring force. At this time, the oil passage between the oil inlet and the first oil outlet of the switching valve 210 is open, and the main hydraulic oil can be delivered to the first cylinder 300 through the switching valve 210. When the pressure receiving end of the switching valve 210 receives hydraulic pressure from the pilot hydraulic oil, the hydraulic pressure pushes the switching valve 210 to the second conducting position. At this time, the oil passage between the oil inlet and the second oil outlet of the switching valve 210 is open, and the main hydraulic oil can be delivered to the second cylinder 400 through the switching valve 210.

[0057] As can be seen, this optional embodiment can also control whether the pilot hydraulic module 500 can exert hydraulic pressure on the pilot hydraulic oil of the switching valve 210 through the solenoid valve 220, thereby controlling the conduction position of the switching valve 210, and then controlling the switching of the first cylinder 300 or the second cylinder 400 to work, thereby improving the control performance of the hydraulic control system.

[0058] As shown in Figure 2, in an optional embodiment, the main hydraulic module 100 includes a main hydraulic pump 110 and a directional valve 120. The main hydraulic pump 110 is used to supply main hydraulic oil; the oil inlet of the directional valve 120 is connected to the oil circuit of the main hydraulic pump 110, the oil outlet of the directional valve 120 is connected to the oil circuit of the oil inlet of the switching valve 210, and the pressure receiving end of the directional valve 120 is connected to the pilot hydraulic module 500. The directional valve 120 is used to open or close according to the pilot hydraulic oil.

[0059] In this optional embodiment, the main hydraulic pump 110 is connected to the inlet oil circuit of the directional valve 120 so that the main hydraulic oil supplied by the main hydraulic pump 110 can be delivered to the directional valve 120. The inlet oil circuit of the switching valve 210 is connected to the outlet oil circuit of the directional valve 120. When the oil circuit between the inlet and outlet oil circuits of the directional valve 120 is open, the main hydraulic oil can be delivered to the switching valve 210. When the oil circuit between the inlet and outlet oil circuits of the directional valve 120 is closed, the main hydraulic oil cannot be delivered to the switching valve 210.

[0060] The directional control valve 120 has a first pressure receiving end and a second pressure receiving end, and the pilot hydraulic module 500 is connected to the oil circuits of the first and second pressure receiving ends respectively. When the first or second pressure receiving end of the directional control valve 120 receives hydraulic pressure from the pilot hydraulic oil, the valve core of the directional control valve 120 moves, thereby opening or closing the oil circuit between the inlet and outlet ends of the directional control valve 120. Simultaneously, through the action of the pilot hydraulic oil on the first or second pressure receiving end of the directional control valve 120, the movement of the valve core can also change the oil circuit, thereby changing the flow direction of the hydraulic oil. This allows the main hydraulic oil supplied by the main hydraulic pump 110 to be delivered in different circulation directions within the oil circuit between the directional control valve 120 and the switching valve 210. It can be understood that the circulation direction of the main hydraulic oil in the oil circuit can affect the movement state of the corresponding cylinder, thereby controlling the direction of movement of the excavator to perform corresponding actions.

[0061] As can be seen, this optional embodiment can also control the on / off of the main hydraulic oil supplied by the main hydraulic pump 110 through the reversing valve 120, thereby improving the control performance of the hydraulic control system.

[0062] As shown in Figure 2, in an optional embodiment, the hydraulic control system further includes a high-pressure protection module 600. The high-pressure protection module 600 is connected to the oil outlet and oil return of the directional valve 120, respectively, and is used to deliver the overpressure hydraulic oil discharged from the oil outlet of the directional valve 120 to the oil return of the directional valve 120.

[0063] In this optional embodiment, the overpressure hydraulic oil is the main hydraulic oil that needs pressure reduction due to excessively high hydraulic pressure in the oil circuit. A high-pressure protection module 600 is connected between the oil outlet and return end of the directional valve 120. The high-pressure protection module 600 can transport the overpressure hydraulic oil from the oil outlet end of the directional valve 120 back to the oil return end of the directional valve 120, thereby reducing the hydraulic pressure load in the oil circuit downstream of the oil outlet end of the directional valve 120. It can also transport the overpressure main hydraulic oil back to the oil return end of the directional valve 120 for reuse.

[0064] As can be seen, this optional embodiment can also reduce the hydraulic pressure load in the hydraulic control system through the high-pressure protection module 600, thereby achieving overpressure protection for the hydraulic control system and improving the reliability of the hydraulic control system.

[0065] As shown in Figure 2, in an optional embodiment, the high-pressure protection module 600 includes a first oil port relief valve 610. The oil inlet of the first oil port relief valve 610 is connected to the oil circuit of the first oil outlet of the directional valve 120, and the oil outlet of the first oil port relief valve 610 is connected to the oil circuit of the oil return of the directional valve 120. The first oil port relief valve 610 is used to deliver the overpressure hydraulic oil discharged from the directional valve 120 to the oil return of the directional valve 120.

[0066] In this optional embodiment, a first oil port relief valve 610 is connected between the first oil outlet and the return oil outlet of the directional valve 120. It is understood that in Figure 2, if no black dot is marked at the intersection of the two oil lines, it is considered that the two oil lines are not connected at that point; if a black dot is marked, it is considered that the two oil lines are connected at that point. The operator can control the first oil port relief valve 610 to open or close by manipulating relevant control devices on the excavator, such as control levers or control panels, thereby enabling or disabling the overpressure protection function. When the first oil port relief valve 610 is open, overpressured hydraulic oil can be transported from the first oil outlet of the directional valve 120 back to the return oil outlet of the directional valve 120, thereby reducing the hydraulic pressure load in the oil circuit downstream of the first oil outlet of the directional valve 120, and also allowing the overpressured main hydraulic oil to be transported back to the return oil outlet of the directional valve 120 for reuse.

[0067] As can be seen, this optional embodiment can also reduce the hydraulic pressure load in the hydraulic control system through the first oil port relief valve 610, realize overpressure protection of the hydraulic control system, and thus improve the reliability of the hydraulic control system.

[0068] As shown in Figure 2, in an optional embodiment, the high-pressure protection module 600 includes a second oil port relief valve 620. The oil inlet of the second oil port relief valve 620 is connected to the oil circuit of the second oil outlet of the directional valve 120, and the oil outlet of the second oil port relief valve 620 is connected to the oil circuit of the oil return of the directional valve 120. The second oil port relief valve 620 is used to deliver the overpressure hydraulic oil discharged from the directional valve 120 to the oil return of the directional valve 120.

[0069] In this optional embodiment, a second oil port relief valve 620 is connected between the second oil outlet and the return oil outlet of the directional valve 120. The operator can control the second oil port relief valve 620 to open or close by operating control devices such as control levers or control panels on the excavator. When the second oil port relief valve 620 is open, overpressured hydraulic oil can be transported from the second oil outlet of the directional valve 120 back to the return oil outlet of the directional valve 120, thereby reducing the hydraulic pressure load in the oil circuit downstream of the second oil outlet of the directional valve 120, and further improving the pressure reduction effect on the hydraulic control system.

[0070] As can be seen, this optional embodiment can further reduce the hydraulic pressure load in the hydraulic control system through the second oil port relief valve 620, thereby further improving the reliability of the hydraulic control system.

[0071] In an optional embodiment, the pilot hydraulic module 500 includes a pilot pump connected to the oil circuits of the solenoid valve 220 and the directional valve 120, respectively, and the pilot pump is used to provide pilot hydraulic oil.

[0072] In an optional embodiment, the pilot hydraulic module 500 further includes a pilot valve, which is connected to the pilot pump, solenoid valve 220 and directional valve 120 respectively. The pilot valve is used to switch the oil passage between the pilot pump and solenoid valve 220 and / or directional valve 120 to be open or closed according to the pilot control signal.

[0073] In this optional embodiment, the pilot pump is connected to the pilot valve's oil circuit so that the pilot hydraulic oil supplied by the pilot pump can be delivered to the pilot valve. The operator can control the pilot valve to open or close the oil circuit passages of the solenoid valve 220 and the directional valve 120 by manipulating control devices on the excavator, such as joysticks or control panels. When the oil circuit passage between the pilot pump and the solenoid valve 220 is open, pilot hydraulic oil can be delivered to the solenoid valve 220 through the pilot valve; when the oil circuit passage between the pilot pump and the directional valve 120 is open, pilot hydraulic oil can be delivered to the directional valve 120 through the pilot valve.

[0074] As can be seen, this optional embodiment can also control whether the pilot hydraulic oil provided by the pilot pump can be delivered to the solenoid valve 220 and the directional valve 120 through the pilot valve, thereby controlling the valve position of the solenoid valve 220 and the directional valve 120, thereby improving the control performance of the hydraulic control system.

[0075] In an optional embodiment, the first cylinder 300 is used to initiate the boom movement function according to the main hydraulic oil, and the second cylinder 400 is used to initiate the bulldozer blade movement function according to the main hydraulic oil.

[0076] In this optional embodiment, the excavator's second boom and bulldozer blade do not operate simultaneously. Therefore, the first cylinder 300 can be selected as the second boom cylinder, and the second cylinder 400 can be selected as the bulldozer blade cylinder. The second boom cylinder begins to move when it receives hydraulic pressure from the main hydraulic oil, thus activating the second boom function. Similarly, the bulldozer blade cylinder begins to move when it receives hydraulic pressure from the main hydraulic oil, thus activating the bulldozer blade function.

[0077] This utility model also discloses an excavator, which includes a first action execution device, a second action execution device, and the hydraulic control system described in the above embodiments of this utility model. A first cylinder 300 is connected to the first action execution device, and a second cylinder 400 is connected to the second action execution device. The first cylinder 300 is used to control the first action execution device to perform a first action according to the main hydraulic oil, and the second cylinder 400 is used to control the second action execution device to perform a second action according to the main hydraulic oil.

[0078] As can be seen, in this embodiment, the excavator can control whether the oil passage between the main hydraulic module 100 and the first cylinder 300 and the second cylinder 400 is connected through the switching module 200, so that the two cylinders share the same main hydraulic module 100. There is no need to configure a separate main hydraulic module 100 for each cylinder, thereby improving the layout integration of the hydraulic control system and reducing the space occupied by the hydraulic control system in the excavator. At the same time, since the required configuration of the main hydraulic module 100 and the corresponding pipeline lines are reduced, the cost of the excavator is also reduced.

[0079] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A hydraulic control system, characterized in that, The system includes: a main hydraulic module for providing main hydraulic oil; a switching module connected to the main hydraulic module via an oil circuit; a first cylinder connected to the switching module via an oil circuit; and a second cylinder connected to the switching module via an oil circuit. The switching module is used to switch the oil circuit connection between the first cylinder and the main hydraulic module, or to switch the oil circuit connection between the second cylinder and the main hydraulic module, according to a switching signal. The first cylinder is used to initiate a first action function based on the main hydraulic oil supply, and the second cylinder is used to initiate a second action function based on the main hydraulic oil supply.

2. The hydraulic control system according to claim 1, characterized in that, The system further includes a pilot hydraulic module, the switching module comprising: a switching valve, the inlet of which is connected to the oil circuit of the main hydraulic module, the first outlet of which is connected to the oil circuit of the first cylinder, and the second outlet of which is connected to the oil circuit of the second cylinder; and a solenoid valve, which is connected to the pressure receiving ends of the pilot hydraulic module and the switching valve respectively; wherein, the pilot hydraulic module is used to provide pilot hydraulic oil, the solenoid valve is used to open or close the oil circuit passage between the pilot hydraulic module and the switching valve according to the switching signal, and the switching valve is used to switch the oil circuit connection between the first cylinder or the second cylinder and the main hydraulic module according to the pilot hydraulic oil.

3. The hydraulic control system according to claim 2, characterized in that, The main hydraulic module includes: a main hydraulic pump for providing main hydraulic oil; a directional valve, the inlet of which is connected to the oil circuit of the main hydraulic pump, the outlet of which is connected to the inlet of the switching valve, and the pressure receiving end of which is connected to the pilot hydraulic module. The directional valve is used to open or close according to the pilot hydraulic oil.

4. The hydraulic control system according to claim 3, characterized in that, The system further includes a high-pressure protection module, which is connected to the oil outlet and the oil return of the directional valve, respectively. The high-pressure protection module is used to transport the overpressure hydraulic oil discharged from the oil outlet of the directional valve to the oil return of the directional valve.

5. The hydraulic control system according to claim 4, characterized in that, The high-pressure protection module includes: a first oil port relief valve, the oil inlet of the first oil port relief valve is connected to the first oil outlet of the directional valve, the oil outlet of the first oil port relief valve is connected to the return oil of the directional valve, and the first oil port relief valve is used to transport the overpressure hydraulic oil discharged by the directional valve to the return oil of the directional valve.

6. The hydraulic control system according to claim 5, characterized in that, The high-pressure protection module includes: a second oil port relief valve, the oil inlet of the second oil port relief valve is connected to the oil circuit of the second oil outlet of the reversing valve, the oil outlet of the second oil port relief valve is connected to the oil circuit of the return oil of the reversing valve, and the second oil port relief valve is used to transport the overpressure hydraulic oil discharged by the reversing valve to the return oil of the reversing valve.

7. The hydraulic control system according to claim 3, characterized in that, The pilot hydraulic module includes a pilot pump, which is connected to the oil circuits of the solenoid valve and the directional valve, respectively, and is used to provide the pilot hydraulic oil.

8. The hydraulic control system according to claim 7, characterized in that, The pilot hydraulic module further includes a pilot valve, which is connected to the pilot pump, the solenoid valve and the directional valve oil circuit respectively. The pilot valve is used to switch the oil circuit between the pilot pump and the solenoid valve and / or the directional valve to be open or closed according to the pilot control signal.

9. The hydraulic control system according to any one of claims 1 to 8, characterized in that, The first hydraulic cylinder is used to activate the boom's movement function based on the main hydraulic oil, and the second hydraulic cylinder is used to activate the bulldozer blade's movement function based on the main hydraulic oil.

10. An excavator, characterized in that, The excavator includes: a first action execution device; a second action execution device; and a hydraulic control system as described in any one of claims 1 to 9, wherein the first cylinder is connected to the first action execution device, the second cylinder is connected to the second action execution device, the first cylinder is used to control the first action execution device to perform a first action according to the main hydraulic oil, and the second cylinder is used to control the second action execution device to perform a second action according to the main hydraulic oil.

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