Hydraulic system for driving a multi-mechanism and engineering machine

Abstract

The embodiment of the application provides a kind of for driving multiple mechanism hydraulic system, engineering machinery, it is related to hydraulic system technical field.The hydraulic system includes: the first inlet and the first oil outlet of first reversing valve group are communicated, one oil outlet in multiple oil outlets is communicated with one working mechanism in multiple working mechanisms;First solenoid valve group is used to control one of multiple oil outlets and the first inlet is communicated;Second reversing valve group includes second inlet, third inlet and second outlet, second inlet is communicated with the load feedback loop of first working mechanism in multiple working mechanisms, third inlet is communicated with the oil outlet of first oil pump;Second solenoid valve group is used to control one of second inlet and third inlet and the second outlet is communicated;The inlet of first overflow valve is communicated with second outlet and the feedback oil port of first oil pump.Above-mentioned hydraulic system can switch different control mode of hydraulic system to be assigned to different mechanism, and good control effect is realized.

Description

Technical Field

[0001] This application relates to the field of hydraulic system technology, specifically to a hydraulic system for driving multiple mechanisms and engineering machinery. Background Technology

[0002] Large-tonnage hydraulic systems for cranes typically employ multi-pump systems. When only one mechanism is operating, the flow from all pumps can be combined to accelerate that mechanism. When two mechanisms operate simultaneously, each pump independently supplies oil to its corresponding mechanism, without interference, resulting in excellent controllability. When the number of actuators exceeds the number of pumps, the power from one pump can be switched to different mechanisms using a flow divider / merge valve, maintaining good controllability. Existing common flow divider / merge technologies are all external flow divider / merge valve technologies, or some have integrated the flow divider / merge valve into an electro-hydraulic proportional valve assembly based on a single control principle, but these cannot simultaneously achieve energy savings and good low-temperature performance. Summary of the Invention

[0003] The purpose of this application is to provide a hydraulic system and engineering machinery for driving multiple mechanisms.

[0004] To achieve the above objectives, a first aspect of this application provides a hydraulic system for driving multiple mechanisms, comprising: The first oil pump includes a first oil outlet; The first directional valve group includes at least one directional valve. The first directional valve group includes a first oil inlet and multiple oil outlets. The first oil inlet and the first oil outlet are connected. One of the multiple oil outlets is connected to one of the multiple working mechanisms. The first solenoid valve group is used to control the first directional valve group to switch between different working positions so as to control one of the multiple oil outlets to be connected to the first oil inlet. The second reversing valve assembly includes a second oil inlet, a third oil inlet, and a second oil outlet. The second oil inlet is connected to the load feedback loop of the first working mechanism among multiple working mechanisms. The third oil inlet is connected to the oil outlet of the first oil pump. The second oil outlet is connected to the feedback oil outlet of the first oil pump. The second solenoid valve group is used to control the switching of the second directional valve group between different working positions, so as to control one of the second oil inlet and the third oil inlet to be connected to the second oil outlet. The first relief valve has its inlet connected to the second outlet.

[0005] In this embodiment of the application, the hydraulic system further includes: The controller is configured to control the operation of a first solenoid valve group so that a target working mechanism among a plurality of working mechanisms receives power from the first oil pump; and to control the operation of at least a second solenoid valve group so that the first oil pump operates in a working mode matched to the target working mechanism.

[0006] In this embodiment of the application, the controller is further configured to: control the first solenoid valve group to operate, so as to control the first reversing valve group to switch to the target working position, so that the oil outlet of the plurality of oil outlets connected to another working mechanism that is different from the first working mechanism among the plurality of working mechanisms is connected to the first oil inlet. Control the operation of the second solenoid valve group to control the second directional valve group to switch to the first working position, so that the third oil inlet and the second oil outlet are connected. Adjust the overflow pressure of the first overflow valve to the preset overflow pressure.

[0007] In this embodiment, the controller is further configured to: control the first solenoid valve group to switch the first directional valve group to the second working position, so that the oil outlet connected to the first working mechanism among the plurality of oil outlets is connected to the first oil inlet; control the second directional valve group to switch the second directional valve group to the third working position, so that the second oil inlet is connected to the second oil outlet; and adjust the overflow pressure of the first overflow valve to the maximum overflow pressure, wherein the preset overflow pressure is less than the maximum overflow pressure.

[0008] In this embodiment, the first directional valve group includes a first directional valve, which includes a first oil inlet, a third oil outlet, a fourth oil outlet, and a fifth oil outlet. The third oil outlet is connected to the first working mechanism, the fourth oil outlet is connected to the second working mechanism, and the fifth oil outlet is connected to the third working mechanism. The first solenoid valve group includes a first solenoid valve and a second solenoid valve. The pilot oil circuits of the first solenoid valve and the second solenoid valve are respectively connected to the pilot control chamber of the first directional valve to control one of the third oil outlet, the fourth oil outlet, and the fifth oil outlet to be connected to the first oil inlet.

[0009] In this embodiment of the application, controlling the first solenoid valve group to switch the first reversing valve group to the second working position, so that the oil outlet among the multiple oil outlets connected to the first working mechanism is connected to the first oil inlet, includes: controlling the first solenoid valve and the second solenoid valve to close, so as to control the first reversing valve to switch to the second working position, so that the third oil outlet is connected to the first oil inlet.

[0010] In this embodiment, the target working position includes a fourth working position or a fifth working position; controlling the first solenoid valve group to switch the first directional valve group to the target working position, so that the oil outlet among the multiple oil outlets connected to another working mechanism different from the first working mechanism among the multiple working mechanisms is connected to the first oil inlet includes: controlling the first solenoid valve to open and the second solenoid valve to close, so as to control the first directional valve to switch to the fourth working position, so that the fourth oil outlet is connected to the first oil inlet; or controlling the first solenoid valve to close and the second solenoid valve to open, so as to control the first directional valve to switch to the fifth working position, so that the fifth oil outlet is connected to the first oil inlet.

[0011] In this embodiment, the first directional valve includes a first pilot control chamber and a second pilot control chamber, which are respectively connected to the pilot oil circuit of the first solenoid valve and the pilot oil circuit of the second solenoid valve.

[0012] In this embodiment, the second directional valve group includes a second directional valve, which includes a second oil inlet, a third oil inlet, and a second oil outlet; the second solenoid valve group includes a third solenoid valve, the pilot oil circuit of which is connected to the pilot control chamber of the second directional valve to control one of the second oil inlet and the third oil inlet to be connected to the second oil outlet.

[0013] In this embodiment of the application, controlling the operation of the second directional valve group to switch the second directional valve group to the third working position includes: controlling the operation of the third solenoid valve to switch the second directional valve to the third working position; controlling the operation of the second solenoid valve group to switch the second directional valve group to the first working position includes: controlling the operation of the third solenoid valve to switch the second directional valve group to the first working position.

[0014] In this embodiment, the first relief valve is an electro-proportional relief valve.

[0015] In this embodiment of the application, the hydraulic system further includes: a second oil pump, the oil outlet of the second oil pump being connected to the first working mechanism, and the feedback oil circuit of the first working mechanism being connected to the feedback oil port of the second oil pump.

[0016] The second aspect of this application provides an engineering machinery, which includes the hydraulic system provided in the first aspect of this application.

[0017] In this embodiment of the application, the construction machinery is a crane, and the first working mechanism includes one of a luffing mechanism, a hoisting mechanism, and a telescopic mechanism.

[0018] Through the above technical solution, the hydraulic system for driving multiple mechanisms provided in this application embodiment enables the first oil pump to provide power to the first working mechanism in a load-sensitive working mode. The controller can control the operation of the first solenoid valve group and the second solenoid valve group, so that the oil outlet of the first directional valve group that is connected to another working mechanism different from the first working mechanism is connected to the first oil inlet, thereby enabling the first oil pump to supply power to the other working mechanism; the second directional valve group switches to the first working position, so that the third oil inlet and the second oil outlet are connected, and the overflow pressure of the first relief valve is adjusted to the preset overflow pressure, thereby enabling the first oil pump to supply power to the other working mechanism in a constant pressure working mode. In summary, the hydraulic system for multiple mechanisms provided in this application embodiment, through the above-described oil circuit configuration, enables the first oil pump to supply power to the first working mechanism in a load-sensitive working mode, or to supply power to another working mechanism different from the first working mechanism in a constant-pressure working mode. This combines the advantages of high energy efficiency of the load-sensitive system and good low-temperature characteristics of the constant-pressure system, allowing users to control the controller to switch different control modes of the hydraulic system at any time according to different application scenarios and allocate them to different mechanisms, thereby achieving good control effects.

[0019] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. In the drawings: Figure 1 The diagram schematically illustrates a structural block diagram of a hydraulic system for driving multiple mechanisms according to an embodiment of this application; Figure 2 Schematic illustration Figure 1 The diagram shown is a partial structural block diagram of a hydraulic system used to drive multiple mechanisms. Figure 3 The schematic diagram illustrates a structural block diagram of another hydraulic system for driving multiple mechanisms according to an embodiment of this application; Figure 4 Schematic illustration Figure 3 The diagram shown is a partial structural block diagram of a hydraulic system used to drive multiple mechanisms. Figure 5 The diagram illustrates the internal structure of a computer device according to an embodiment of this application.

[0021] Explanation of reference numerals in the attached figures 102 First oil pump; 104 First directional valve assembly; 1042 First directional valve; 106 First solenoid valve group; 110 Second solenoid valve group; 1062 First solenoid valve; 1064 Second solenoid valve; 1102 Third solenoid valve; 108 Second directional valve assembly; 1082 Second directional valve; 112 First relief valve; 114 First working mechanism; 116 Second oil pump; 118 Second working mechanism; 120 Third working mechanism. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for illustration and explanation of the embodiments of this application and are not intended to limit the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0023] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0024] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0025] The acquisition, transmission, storage, use, and processing of data in this application comply with relevant laws and regulations. Furthermore, it should be noted that certain software, components, models, and other existing industry solutions may be mentioned in the embodiments of this application. These should be considered exemplary, intended only to illustrate the feasibility of implementing the technical solution of this application, and do not imply that the applicant has already used or necessarily used such solutions.

[0026] See Figure 1 and Figure 2This application provides a hydraulic system for driving multiple mechanisms. The hydraulic system includes: a first oil pump 102, a first directional valve group 104, a first solenoid valve group 106, a second directional valve group 108, a second solenoid valve group 110, a first relief valve 112, and a controller (not shown in the figure). The first oil pump 102 includes a first oil outlet; the first directional valve group 104 includes at least one directional valve, and the first directional valve group 104 includes a first oil inlet and multiple oil outlets. The first oil inlet is connected to the first oil outlet of the first oil pump 102, and one of the multiple oil outlets is connected to one of the multiple working mechanisms. The first solenoid valve group 106 is used to control the first directional valve group 104 to switch between different working positions so as to control one of the multiple oil outlets to be connected to the first oil inlet. The second reversing valve group 108 includes a second oil inlet, a third oil inlet, and a second oil outlet. The second oil inlet is connected to the load feedback loop (LS port) of the first working mechanism 114 among the multiple working mechanisms. The third oil inlet is connected to the oil outlet of the first oil pump 102. The second oil outlet is connected to the feedback oil port (LS port) of the first oil pump 102. The second solenoid valve group 110 is used to control the second directional valve group 108 to switch between different working positions, so as to control one of the second oil inlet and the third oil inlet to be connected to the second oil outlet. The first overflow valve 112 has an oil inlet connected to the second oil outlet, and the oil outlet is connected to the oil tank.

[0027] In this embodiment, the hydraulic system may further include a controller configured to control the operation of a first solenoid valve group 106 so that a target working mechanism among a plurality of working mechanisms receives power from the first oil pump 102; and to control the operation of at least a second solenoid valve group 110 so that the first oil pump 102 operates in a working mode matching the target working mechanism.

[0028] Specifically, in this embodiment, the controller can be further configured to: control the first solenoid valve group 106 to switch the first directional valve group 104 to the target working position, so that the oil outlet of the plurality of oil outlets connected to another working mechanism different from the first working mechanism 114 among the plurality of working mechanisms is connected to the first oil inlet; control the second solenoid valve group 110 to switch the second directional valve group 108 to the first working position, so that the third oil inlet is connected to the second oil outlet; and adjust the overflow pressure of the first overflow valve 112 to the preset overflow pressure.

[0029] The hydraulic system for driving multiple mechanisms provided in this application embodiment controls the switching of the first directional valve group 104 between different working positions via a first solenoid valve group 106, so that one of the multiple oil outlets of the first directional valve group 104 is connected to the first oil inlet, thereby allowing hydraulic oil from the first oil outlet of the first oil pump 102 to provide power to one of the multiple working mechanisms. The second solenoid valve group 110 controls the switching of the working positions of the second directional valve group 108. The second oil inlet of the second directional valve group 108 is connected to the load feedback loop of the first working mechanism 114 among the multiple working mechanisms, the third oil inlet of the second directional valve group 108 is connected to the oil outlet of the first oil pump 102, and the second oil outlet is connected to the feedback oil port of the first oil pump 102. A first relief valve 112 is also provided, with its oil inlet connected to the second oil outlet of the second directional valve group 108.

[0030] The operating modes of the first oil pump 102 may include a load-sensitive operating mode and a constant-pressure operating mode. Based on the above configuration of the hydraulic system, the controller can control which working mechanism the first oil pump 102 provides power to by controlling the first solenoid valve group 106, and control the operating mode of the first oil pump 102 by controlling the second solenoid valve group 110. In one case, since the second oil inlet of the second directional valve group 108 is connected to the load feedback loop of the first working mechanism 114, and the second oil outlet is connected to the feedback oil port of the first oil pump 102, the hydraulic system for driving multiple mechanisms provided in this application embodiment can enable the first oil pump 102 to provide power to the first working mechanism 114 (target working mechanism) in a load-sensitive operating mode. Alternatively, in another scenario, the controller can control the operation of the first solenoid valve group 106 and the second solenoid valve group 110, thereby connecting the oil outlet of the multiple oil outlets of the first directional valve group 104 that is connected to another working mechanism (another target working mechanism) different from the first working mechanism 114 with the first oil inlet, thereby enabling the first oil pump 102 to supply power to the other working mechanism; the second directional valve group 108 switches to the first working position, connecting the third oil inlet and the second oil outlet, and adjusting the overflow pressure of the first overflow valve 112 to the preset overflow pressure, thereby enabling the first oil pump 102 to supply power to the other working mechanism in a constant pressure working mode.

[0031] In summary, the hydraulic system for multiple mechanisms provided in this application embodiment, through the above-described oil circuit configuration, enables the first oil pump 102 to supply power to the first working mechanism 114 in a load-sensitive working mode, or to supply power to another working mechanism different from the first working mechanism 114 in a constant-pressure working mode. This combines the advantages of high energy efficiency of the load-sensitive system and good low-temperature characteristics of the constant-pressure system, allowing users to control the controller to switch different control modes of the hydraulic system at any time according to different application scenarios, and allocate them to different mechanisms to achieve good control effects.

[0032] In some embodiments of this application, in order to enable the controller to control the first oil pump 102 to supply power to the first working mechanism 114 in a load-sensitive operating mode, the controller is further configured to: control the first solenoid valve group 106 to switch the first directional valve group 104 to the second working position, so that the oil outlet connected to the first working mechanism 114 among the multiple oil outlets is connected to the first oil inlet; control the second directional valve group 108 to switch the second directional valve group 108 to the third working position, so that the second oil inlet is connected to the second oil outlet; and adjust the overflow pressure of the first relief valve 112 to the maximum overflow pressure, wherein the preset overflow pressure is less than the maximum overflow pressure.

[0033] Specifically, the controller can be one of a microcontroller (MCU), a digital signal processor (DSP), or a programmable logic controller (PLC), capable of controlling the solenoid valves in the first solenoid valve group 106 and the second solenoid valve group 110. The controller's control of the solenoid valves in the first solenoid valve group 106 and the second solenoid valve group 110 can be activated by the user. The user selects the working mechanism to be driven and sends instructions to the controller, which then executes the corresponding instructions to control the first solenoid valve group 106 and the second solenoid valve group 110.

[0034] In some embodiments of this application, the first relief valve 112 is an electro-proportional relief valve. The first relief valve 112, as an electro-proportional relief valve, can also be controlled by a controller to regulate the relief pressure.

[0035] In some embodiments of this application, see Figure 3 The hydraulic system for driving multiple mechanisms provided in this application embodiment further includes: a second oil pump 116, the oil outlet of the second oil pump 116 being connected to the first working mechanism 114, and the feedback oil circuit of the first working mechanism 114 being connected to the feedback oil port of the second oil pump 116.

[0036] In the above embodiment, the oil outlet of the second oil pump 116 is connected to the first working mechanism 114, and the feedback oil port of the second oil pump 116 is connected to the feedback oil circuit of the first working mechanism 114, so that the hydraulic system can supply power to the first working mechanism 114 in a load-sensitive working mode through the first oil pump 102 and the second oil pump 116; or supply power to the first working mechanism 114 in a load-sensitive working mode through the second oil pump 116, and supply power to another working mechanism different from the first working mechanism 114 through the first oil pump 102 in a constant pressure working mode.

[0037] In some embodiments of this application, the first directional valve group 104 and the second directional valve group 108 may be provided with multiple directional valves. The first directional valve group 104 has at least one directional valve. In some embodiments, the first directional valve group 104 may also be provided with multiple directional valves that operate in parallel or are connected by inlet and outlet ports. Similarly, the second directional valve group 108 may also be provided with multiple directional valves that operate in parallel or are connected by inlet and outlet ports. The first solenoid valve group 106 and the second solenoid valve group 110 may be provided with multiple solenoid valves. The number of solenoid valves may be set based on the number of directional valves and the ports in the first directional valve group 104 and the second directional valve group 108. Multiple solenoid valves may also be connected to each other to achieve multi-stage solenoid valve series control. The number of valves and the connection methods of the first directional valve group 104, the second directional valve group 108, the first solenoid valve group 106, and the second solenoid valve group 110 are varied and difficult to exhaustively list. Therefore, this application will not describe all valve configuration schemes in detail. The following embodiment provides a simplified arrangement of the first directional valve group 104 and the first solenoid valve group 106.

[0038] In some embodiments of this application, see Figure 4 The first directional valve assembly 104 includes a first directional valve 1042, which includes a first oil inlet, a third oil outlet, a fourth oil outlet, and a fifth oil outlet. The third oil outlet is connected to the first working mechanism 114, the fourth oil outlet is connected to the second working mechanism 118, and the fifth oil outlet is connected to the third working mechanism 120. The first solenoid valve assembly 106 includes a first solenoid valve 1062 and a second solenoid valve 1064. The pilot oil circuits of the first solenoid valve 1062 and the second solenoid valve 1064 are respectively connected to the pilot control chamber of the first directional valve 1042 to control one of the third, fourth, and fifth oil outlets to connect to the first oil inlet.

[0039] In some embodiments of this application, the second directional valve assembly 108 includes a second directional valve 1082, which includes a second oil inlet, a third oil inlet, and a second oil outlet. The second solenoid valve assembly 110 includes a third solenoid valve 1102, the pilot oil path of which is connected to the pilot control chamber of the second directional valve 1082 to control one of the second oil inlet and the third oil inlet to be connected to the second oil outlet.

[0040] The hydraulic system provided in the above embodiment only requires three solenoid valves, namely the first solenoid valve 1062, the second solenoid valve 1064, and the third solenoid valve 1102, to enable the first oil pump 102 to supply power to the first working mechanism in a load-sensitive working mode, or the first oil pump 102 to supply power to one of the second working mechanism 118 or the third working mechanism 120 in a constant pressure working mode. Furthermore, the control method can be that the low-pressure solenoid valve controls the on / off state of the hydraulic control solenoid valve, and the low-pressure control greatly reduces the failure rate of the valve group.

[0041] In some embodiments of this application, when the first solenoid valve group 106 includes a first solenoid valve 1062 and a second solenoid valve 1064, controlling the first solenoid valve group 106 to switch the first directional valve group 104 to the second working position, so that the oil outlet among the plurality of oil outlets connected to the first working mechanism 114 is connected to the first oil inlet, may include: controlling the first solenoid valve 1062 and the second solenoid valve 1064 to close, so as to control the first directional valve 1042 to switch to the second working position, so that the third oil outlet is connected to the first oil inlet.

[0042] In some embodiments of this application, the target working position may include a fourth working position or a fifth working position. Controlling the first solenoid valve group 106 to switch the first directional valve group 104 to the target working position, such that an oil outlet among the plurality of oil outlets connected to another working mechanism different from the first working mechanism 114 is connected to the first oil inlet, may include: controlling the first solenoid valve 1062 to open and the second solenoid valve 1064 to close, thereby controlling the first directional valve 1042 to switch to the fourth working position, so that the fourth oil outlet is connected to the first oil inlet; or controlling the first solenoid valve 1062 to close and the second solenoid valve 1064 to open, thereby controlling the first directional valve 1042 to switch to the fifth working position, so that the fifth oil outlet is connected to the first oil inlet.

[0043] Specifically, the first directional valve 1042 can be a three-position four-way directional valve, which has the aforementioned second, fourth, and fifth working positions. By switching the first solenoid valve 1062 and the second solenoid valve 1064 on and off, the three-position four-way directional valve can be controlled to be in one of the second, fourth, or fifth working positions.

[0044] In some embodiments of this application, the first directional control valve 1042 includes a first pilot control chamber and a second pilot control chamber, which are respectively connected to the pilot oil circuit of the first solenoid valve 1062 and the pilot oil circuit of the second solenoid valve 1064. The first pilot control chamber and the second pilot control chamber are located on both sides of the first directional control valve 1042.

[0045] In some embodiments of this application, when the second directional valve assembly 108 includes a second directional valve 1082, controlling the operation of the second directional valve assembly 108 to switch it to a third operating position may include controlling the operation of a third solenoid valve 1102 to switch the second directional valve 1082 to the third operating position. Controlling the operation of the second solenoid valve assembly 110 to switch the second directional valve assembly 108 to a first operating position may include controlling the operation of the third solenoid valve 1102 to switch the second directional valve assembly 108 to the first operating position.

[0046] This application also provides an engineering machinery, which includes any of the hydraulic systems provided in this application.

[0047] In some embodiments of this application, the construction machinery is a crane, and the first working mechanism 114 may include: a luffing mechanism, a hoisting mechanism, and a telescopic mechanism.

[0048] The following is combined Figure 3 and Figure 4 The present application provides an exemplary description of the working mode of a hydraulic system for driving multiple mechanisms.

[0049] Operating mode 1: Both the first oil pump 102 and the second oil pump 116 adopt a load-sensitive operating mode, while providing flow to the first working mechanism 114.

[0050] At this time, both the first solenoid valve 1062 and the second solenoid valve 1064 are de-energized, and the first directional valve 1042 is in the neutral position (second working position). The pressurized oil supplied by the first oil pump 102 merges with the second oil pump 116 through the neutral position of the first directional valve 1042, jointly providing flow to the first working mechanism 114. Simultaneously, the third solenoid valve 1102 is also de-energized. The feedback loop LS1 of the second oil pump 116 and the feedback loop LS2 of the first oil pump 102 are connected, with equal pressure, and are fed back to the second oil pump 116 and the first oil pump 102 respectively. The first relief valve 112 is an electro-proportional relief valve, and its current is at its maximum value, serving as a system safety protection function. At this time, both pumps are used as load-sensitive pumps, jointly providing pressurized oil to the first working mechanism 114. The first working mechanism 114 may include a multi-way valve to accelerate the luffing, hoisting, and telescopic mechanisms.

[0051] Working mode 2: The second oil pump 116 adopts the load mode and the first oil pump 102 adopts the constant pressure mode, driving the second working mechanism 118 to operate.

[0052] At this time, the first solenoid valve 1062 is energized, the second solenoid valve 1064 is de-energized, and the directional valve is in the upper position (fourth working position). The pressurized oil supplied by the first oil pump 102 goes to port P3 through the first directional valve 1042, driving the second working mechanism 118 to operate. The third solenoid valve 1102 is energized, and part of the pressurized oil from the first oil pump 102 is fed back to port LS of the first oil pump 102 through damping. The pump is now used as a constant pressure pump. The system pressure can be set according to different working conditions through the first relief valve 112. The set value is slightly higher than the load pressure to ensure the normal operation of the actuator while also saving energy. The pressurized oil from the second oil pump 116 is directly supplied to the first working mechanism 114, forming a load-sensitive system. The first oil pump 102 performs constant pressure control, forming a constant pressure system.

[0053] Working mode 3: The second oil pump 116 adopts the load mode, the first oil pump 102 adopts the constant pressure mode, and drives the third working mechanism 120 to operate.

[0054] At this time, the second solenoid valve 1064 is energized, the first solenoid valve 1062 is de-energized, and the directional valve is in the lower position (fifth working position). The pressure oil provided by the first oil pump 102 goes to port P4 through the first directional valve 1042, driving the third working mechanism 120 to operate. The third solenoid valve 1102 is energized, and part of the pressure oil from the first oil pump 102 is fed back to port LS of the first oil pump 102 through damping. The first oil pump 102 is used as a constant pressure pump at this time. The system pressure is set through the first relief valve 112 according to different operating conditions. The set value is slightly higher than the load pressure to ensure the normal operation of the actuator while also taking energy saving into account.

[0055] The pressurized oil from the second oil pump 116 is directly supplied to the first working mechanism 114, forming a load-sensitive system. The first oil pump 102 performs constant pressure control, forming a constant pressure system.

[0056] In summary, the hydraulic system for driving multiple mechanisms provided in this application utilizes the built-in control oil of a load-sensitive multi-way valve, combined with a composite control method of low-pressure control oil and a hydraulic control valve, to solve the problem of high failure rate of high-pressure solenoid valves. The number of solenoid valves can be set to three, and the merging and splitting valves, constant pressure feedback switching, and constant pressure control-related electro-proportional relief valves are all integrated into the electro-hydraulic proportional multi-way valve, greatly reducing external piping and space occupation. The hydraulic system for driving multiple mechanisms provided in this application can serve as an integrated merging and splitting electro-hydraulic proportional valve group, switching between load-sensitive and constant-pressure systems. While maintaining the advantages of the load-sensitive system, it also solves the disadvantage of slow actuator speed at low temperatures in load-sensitive systems.

[0057] This application provides a processor for running a program, wherein the program executes the configuration of the controller described above during runtime.

[0058] In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as follows: Figure 5 As shown in the figure, the computer device includes a processor A01, a network interface A02, a display screen A04, an input device A05, and a memory (not shown) connected via a system bus. The processor A01 provides computing and control capabilities. The memory includes internal memory A03 and a non-volatile storage medium A06. The non-volatile storage medium A06 stores an operating system B01 and a computer program B02. The internal memory A03 provides an environment for the operation of the operating system B01 and the computer program B02 stored in the non-volatile storage medium A06. The network interface A02 is used for communication with external terminals via a network connection. When the computer program is executed by the processor A01, it implements the configuration of the aforementioned controller. The display screen A04 can be a liquid crystal display (LCD) or an e-ink display. The input device A05 can be a touch layer covering the display screen, buttons, a trackball, or a touchpad mounted on the computer device casing, or an external keyboard, touchpad, or mouse.

[0059] Those skilled in the art will understand that Figure 5 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0060] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0061] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0062] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0063] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0064] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0065] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0066] Computer-readable media include both permanent and non-permanent, removable and non-removable media, which can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0067] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0068] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A hydraulic system for driving a plurality of mechanisms, characterized by, The hydraulic system includes: The first oil pump includes a first oil outlet; The first directional valve group includes at least one directional valve. The first directional valve group includes a first oil inlet and a plurality of oil outlets. The first oil inlet and the first oil outlet are connected. One of the plurality of oil outlets is connected to one of the plurality of working mechanisms. The first solenoid valve group is used to control the first reversing valve group to switch between different working positions so as to control one of the plurality of oil outlets to be connected to the first oil inlet. The second reversing valve assembly includes a second oil inlet, a third oil inlet, and a second oil outlet. The second oil inlet is connected to the load feedback loop of the first working mechanism among the plurality of working mechanisms. The third oil inlet is connected to the oil outlet of the first oil pump. The second oil outlet is connected to the feedback oil outlet of the first oil pump. The second solenoid valve group is used to control the second reversing valve group to switch between different working positions, so as to control one of the second oil inlet and the third oil inlet to be connected to the second oil outlet. The first overflow valve has its inlet connected to the second outlet.

2. The hydraulic system of claim 1, wherein, Also includes: The controller is configured to control the operation of the first solenoid valve group so that a target working mechanism among the plurality of working mechanisms obtains power from the first oil pump; And control at least the second solenoid valve group to operate so that the first oil pump operates in a working mode that matches the target working mechanism.

3. The hydraulic system of claim 2, wherein, The controller is further configured to: Control the first solenoid valve group to switch the first reversing valve group to the target working position, so that the oil outlet of the plurality of oil outlets that is connected to another working mechanism of the plurality of working mechanisms that is different from the first working mechanism is connected to the first oil inlet. Control the second solenoid valve group to switch the second directional valve group to the first working position, so that the third oil inlet is connected to the second oil outlet; Adjust the overflow pressure of the first overflow valve to the preset overflow pressure.

4. The hydraulic system of claim 2, wherein, The controller is further configured to: Control the first solenoid valve group to switch the first reversing valve group to the second working position, so that the oil outlet among the plurality of oil outlets that is connected to the first working mechanism is connected to the first oil inlet. Control the second directional valve group to switch the second directional valve group to the third working position, so that the second oil inlet and the second oil outlet are connected; The overflow pressure of the first overflow valve is adjusted to the maximum overflow pressure, wherein the preset overflow pressure is less than the maximum overflow pressure.

5. The hydraulic system of claim 4, wherein, The first directional valve assembly includes a first directional valve, and the first directional valve includes: The first oil inlet, the third oil outlet, the fourth oil outlet, and the fifth oil outlet are provided. The third oil outlet is connected to the first working mechanism, the fourth oil outlet is connected to the second working mechanism, and the fifth oil outlet is connected to the third working mechanism. The first solenoid valve group includes a first solenoid valve and a second solenoid valve. The pilot oil circuits of the first solenoid valve and the second solenoid valve are respectively connected to the pilot control chamber of the first directional valve to control one of the third oil outlet, the fourth oil outlet and the fifth oil outlet to be connected to the first oil inlet.

6. The hydraulic system of claim 5, wherein, The step of controlling the first solenoid valve group to switch the first reversing valve group to the second working position, such that the oil outlet among the plurality of oil outlets connected to the first working mechanism is connected to the first oil inlet, includes: The first solenoid valve and the second solenoid valve are closed to control the first directional valve to switch to the second working position, so that the third oil outlet is connected to the first oil inlet.

7. The hydraulic system of claim 5, wherein, The target working position includes: the fourth working position or the fifth working position; The step of controlling the first solenoid valve group to switch the first reversing valve group to the target working position, such that the oil outlet among the plurality of oil outlets that is connected to another working mechanism among the plurality of working mechanisms that is different from the first working mechanism, is connected to the first oil inlet includes: Controlling the first solenoid valve to open and the second solenoid valve to close, thereby controlling the first directional valve to switch to the fourth operating position, so that the fourth oil outlet is connected to the first oil inlet; or The first solenoid valve is closed and the second solenoid valve is opened to control the first directional valve to switch to the fifth working position, so that the fifth oil outlet is connected to the first oil inlet.

8. The hydraulic system of claim 5, wherein, The first directional control valve includes a first pilot control chamber and a second pilot control chamber, which are respectively connected to the pilot oil circuit of the first solenoid valve and the pilot oil circuit of the second solenoid valve.

9. The hydraulic system of claim 4, wherein, The second reversing valve assembly includes a second reversing valve, and the second reversing valve includes a second oil inlet, a third oil inlet, and a second oil outlet; The second solenoid valve assembly includes a third solenoid valve, the pilot oil circuit of which is connected to the pilot control chamber of the second directional valve to control one of the second oil inlet and the third oil inlet to be connected to the second oil outlet.

10. The hydraulic system of claim 9, wherein, The control of the second directional valve group to switch the second directional valve group to the third operating position includes: Control the third solenoid valve to switch the second directional valve to the third operating position; The step of controlling the second solenoid valve group to switch the second directional valve group to the first operating position includes: The third solenoid valve is controlled to switch the second directional valve group to the first working position.

11. The hydraulic system of claim 1, wherein, The first relief valve is an electro-proportional relief valve.

12. The hydraulic system of claim 1, wherein, The hydraulic system also includes: The second oil pump has its outlet connected to the first working mechanism, and the feedback oil circuit of the first working mechanism is connected to the feedback oil port of the second oil pump.

13. A working machine, characterized in that The engineering machinery includes the hydraulic system described in any one of claims 1-12.

14. A working machine according to claim 13, characterised in that, The construction machinery includes a crane, and the first working mechanism includes one of a luffing mechanism, a hoisting mechanism, and a telescopic mechanism.

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