CN113153844B - Hydraulic system, control method thereof, and work machine - Google Patents

Hydraulic system, control method thereof, and work machine Download PDF

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Publication number
CN113153844B
CN113153844B CN202110604590.9A CN202110604590A CN113153844B CN 113153844 B CN113153844 B CN 113153844B CN 202110604590 A CN202110604590 A CN 202110604590A CN 113153844 B CN113153844 B CN 113153844B
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China
Prior art keywords
hydraulic
hydraulic system
main control
execution
control valve
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CN202110604590.9A
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CN113153844A (en
Inventor
郭常振
伍荣伟
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Shanghai Sany Heavy Machinery Co Ltd
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Shanghai Sany Heavy Machinery Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
    • F15B13/08—Assemblies of units, each for the control of a single servomotor only
    • F15B13/0803—Modular units
    • F15B13/0846—Electrical details
    • F15B13/0864—Signalling means, e.g. LEDs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/78—Control of multiple output members
    • F15B2211/782—Concurrent control, e.g. synchronisation of two or more actuators

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

The invention provides a hydraulic system, a control method thereof and a working machine, wherein the hydraulic system comprises a power device, an execution device, an induction component and a control module; the power device is used for providing hydraulic power; the execution device comprises a main control valve and an execution mechanism, wherein the main control valve is respectively connected with the execution mechanism and the power device and is used for controlling the movement direction of the execution mechanism; the number of the execution devices is multiple, and the multiple execution devices are arranged in parallel; the sensing component is used for sensing the liquid pressure in the hydraulic system; the control module is in signal connection with the induction component and the power device and is used for controlling hydraulic power output of the power device. In the hydraulic system of the embodiment, through the cooperation of the induction component and the plurality of execution devices, the corresponding execution mechanisms can be driven according to the load signals of the plurality of execution devices, so that overflow loss caused by large load difference among the execution mechanisms is avoided, and the use effect is good.

Description

Hydraulic system, control method thereof, and work machine
Technical Field
The present disclosure relates to hydraulic systems, and particularly to a hydraulic system, a control method thereof, and a working machine.
Background
With the development of technology and the demand of industry, how to improve the working efficiency of a hydraulic system in a working machine and reduce the energy consumption of the working machine has become an important issue at present. The energy consumption of the working machine is reduced, and the hydraulic system is mainly realized by improving the transmission efficiency and reducing the back pressure during the working; in terms of the control method, the energy loss is mainly avoided and overflow is prevented as much as possible.
In recent years, along with development of electric control technology, technology of applying electric control to a hydraulic system is mature, and compared with a traditional hydraulic control system, the electric control hydraulic system can control actions of a working machine more accurately, meanwhile, pressure loss can be reduced, oil consumption is reduced, efficiency is improved, and energy conservation and environmental protection are achieved.
In a hydraulic system of a traditional working machine, a single pump body shunt driving mode is generally adopted, when the hydraulic system performs compound actions, because loads in a plurality of execution mechanisms for supplying oil by the same pump are different, overflow occurs due to lower loads, partial driving force of the execution mechanism with high load is consumed, energy loss is caused, and the use effect is poor.
Therefore, improvements to existing hydraulic systems are needed to change the state of the art.
Disclosure of Invention
The invention provides a hydraulic system, a control method thereof and a working machine, which are used for solving the problem that in the traditional hydraulic system, overflow occurs due to different loads of a plurality of actuating mechanisms, so that energy is lost.
The present invention provides a hydraulic system comprising:
the power device is used for providing hydraulic power;
the execution device comprises a main control valve and an execution mechanism, wherein the main control valve is respectively connected with the execution mechanism and the power device and is used for controlling the movement direction of the execution mechanism; the number of the execution devices is multiple, and the execution devices are arranged in parallel;
a sensing assembly for sensing a fluid pressure in the hydraulic system; and
and the control module is connected with the sensing assembly and the power device in a signal manner and is used for controlling the hydraulic power output of the power device.
According to one embodiment of the invention, the main control valve has at least two driving ports, and the two driving ports are respectively connected to a plurality of connecting ports of the actuator; the sensing assembly comprises a plurality of pressure sensors, and the pressure sensors are connected with the control module in a signal mode; at least one pressure sensor is arranged between each group of the driving ports and the connecting ports.
According to one embodiment of the invention, the power plant comprises a branching assembly and a hydraulic oil tank, wherein the branching assembly is respectively connected with the hydraulic oil tank and the main control valve, the branching assembly is connected with the control module in a signal manner, and the branching assembly is used for controlling the flow between the hydraulic oil tank and the main control valve.
According to one embodiment of the invention, the branching assembly comprises a hydraulic main pump and a proportional valve, wherein the hydraulic main pump is respectively connected with one end of the proportional valve and the hydraulic oil tank, the other end of the proportional valve is connected with an input port of the main control valve, and the proportional valve is used for controlling the flow between the main control valve and the hydraulic oil pump.
According to one embodiment of the invention, the proportional valve is an electro-hydraulic proportional valve.
According to an embodiment of the invention, the hydraulic oil tank includes a main oil tank to which the hydraulic oil pump is connected and a return oil tank to which a return port of the main control valve is connected.
According to one embodiment of the invention, the number of the proportional valves is plural, and the plural proportional valves are arranged in parallel and connected together to the input port of the main control valve.
According to one embodiment of the invention, the actuating mechanism is a hydraulic cylinder or a rotary cylinder.
The invention also provides a working machine, which comprises a machine body and the hydraulic system of any one of the above, wherein the hydraulic system is arranged on the machine body.
The invention also provides a control method of the hydraulic system, which adopts the hydraulic system according to any one of the above, and comprises the following steps:
acquiring load signals of a plurality of execution devices;
comparing a plurality of said load signals;
and according to the comparison result, the power device drives a plurality of execution mechanisms with similar values of the load signals to start.
When the hydraulic system of the embodiment is used, the liquid pressure in the hydraulic system is sensed through the sensing assembly, so that load signals of a plurality of power devices can be obtained, the control module judges the load signals and drives a plurality of actuating mechanisms with similar loads to operate at the same time, and overflow loss caused by different loads is avoided.
In the hydraulic system of the embodiment, through the cooperation of the induction component and the plurality of execution devices, the corresponding execution mechanisms can be driven according to the load signals of the plurality of execution devices, so that overflow loss caused by large load difference among the execution mechanisms is avoided, and the use effect is good.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a hydraulic system in an embodiment of the invention;
FIG. 2 is a schematic diagram of a hydraulic system in another embodiment of the invention;
FIG. 3 is a schematic diagram of a combination of a main control valve and a proportional valve in an embodiment of the invention;
FIG. 4 is a control schematic of a hydraulic system in an embodiment of the invention;
FIG. 5 is a flow chart of a control method in an embodiment of the invention;
reference numerals:
10. a hydraulic system; 100. An execution device; 110. An actuator;
120. a main control valve; 200. An induction assembly; 210. A first pressure sensor;
220. a second pressure sensor; 300. A power device; 310. A shunt assembly;
311. a hydraulic main pump; 311a, a first hydraulic main pump; 311b, a second hydraulic main pump;
3111. a main pump driving member; 312. A proportional valve; 312a, a first proportional valve;
312b, a second proportional valve; 320. A hydraulic oil tank; 321. A main oil tank;
322. a return oil tank; 400. And a control module.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, an embodiment of the present invention provides a hydraulic system 10, which includes an actuator 100, a sensing assembly 200, a power device 300 and a control module 400, wherein the power device 300 is used as a power source for driving the actuator 100, the sensing assembly 200 is used for sensing oil pressure of the hydraulic system 10, and the control module 400 is used for controlling hydraulic power output of the power device 300;
specifically, the actuator 100 includes a main control valve 120 and an actuator 110, the main control valve 120 is connected to the actuator 110 and the power device 300, respectively, and the main control valve 120 is used for controlling the movement direction of the actuator 110; wherein the number of the execution devices 100 is multiple, and the multiple execution devices 100 are arranged in parallel; the sensing assembly 200 is used to sense the pressure of the fluid in the hydraulic system 10; the control module 400 is signally connected to the sensing assembly 200 and the power plant 300 and is used to control the hydraulic power output of the power plant 300.
When the hydraulic system 10 of the present embodiment is used, the sensing assembly 200 is provided to sense the pressure of the fluid in the hydraulic system 10, so that the load signals of the power devices 300 can be obtained, the control module 400 determines the load signals, and drives the actuators 110 with similar loads to perform the operation, so as to avoid the overflow loss caused by different loads.
In the hydraulic system 10 of the present embodiment, by setting the sensing assembly 200 to cooperate with the plurality of execution devices 100, the corresponding execution mechanisms 110 can be driven according to the load signals of the plurality of execution devices 100, so that overflow loss caused by a large load difference between the execution mechanisms 110 is avoided, and the use effect is good.
Specifically, the main control valve 120 has at least two driving ports, and the two driving ports are respectively connected to a plurality of connection ports of the actuator 110; the sensing assembly 200 comprises a plurality of pressure sensors, and the plurality of pressure sensors are all connected with the control module 400 in a signal manner; at least one pressure sensor is arranged between each group of driving ports and the connecting ports.
Referring to fig. 2 and 3, in the present embodiment, the main control valve 120 has a first driving port C1 and a second driving port C2, wherein C1 is connected to a first connection port of the actuator 110, C2 is connected to a second connection port of the actuator 110, the first connection port and the second connection port are respectively communicated with two hydraulic cavities of the actuator 110, and the number of the pressure sensors is two, and is respectively a first pressure sensor 210 and a second pressure sensor 220, the first pressure sensor 210 is used for sensing the oil pressure between C1 and the first connection port, and the second pressure sensor 220 is used for sensing the oil pressure between C2 and the second connection port;
when the actuator 110 is driven to operate, one of the C1 and C2 may input hydraulic oil into the hydraulic chamber of the actuator 110, and the other may be used to return hydraulic oil in the other hydraulic chamber of the actuator 110; in another embodiment, the main control valve 120 may also have a driving port, and the actuator 110 is provided with a connection port connected to the driving port, where the number of pressure sensors is one, and is used to sense the oil pressure between the two; in other embodiments, the main control valve 120 may be provided with three or more driving ports, and the actuator 110 is provided with a number of connection ports corresponding to the driving ports, and a pressure sensor is disposed between each driving port and each connection port for sensing the pressure of the driving port, which is not described herein.
In an embodiment, a plurality of pressure sensors can be further arranged on the pipeline between the driving port and the connecting port at intervals, so that the pressure signals at different positions of the pipeline can be detected by the plurality of pressure sensors, and the sensing accuracy of the sensing assembly 200 can be improved by analyzing and calculating the pressure signals through the control module 400, so that the use effect is good.
Specifically, referring to fig. 1 and 2, the power plant 300 includes a branching assembly 310 and a hydraulic tank 320, the branching assembly 310 is connected to the hydraulic tank 320 and the main control valve 120, respectively, the branching assembly 310 is signal-connected to the control module 400, and the branching assembly 310 is used to control the flow rate between the hydraulic tank 320 and the main control valve 120.
In this embodiment, the hydraulic oil tank 320 is used to store hydraulic oil, after the power device 300 is started, the branching assembly 310 may pump the hydraulic oil tank 320 to the actuator 110 to drive the actuator 110 to act, the branching assembly 310 may be in signal connection with the control module 400, and adjust the flow of the hydraulic oil in the branching assembly 310 through the control module 400, and when the branching assembly 310 is connected to the plurality of actuators 100, the flow of the hydraulic oil may be distributed.
Referring to fig. 1, in the present embodiment, the bypass assembly 310 includes a hydraulic main pump 311 and a proportional valve 312, the hydraulic main pump 311 is connected to one end of the proportional valve 312 and the hydraulic tank 320, respectively, the other end of the proportional valve 312 is connected to an input port a of the main control valve 120, and the proportional valve 312 is used for controlling the flow rate between the main control valve 120 and the hydraulic oil pump.
It can be understood that when the power device 300 of the present embodiment is adopted, the hydraulic main pump 311 is connected to an external power source, and pumps the hydraulic oil in the hydraulic oil tank 320 to the proportional valve 312, and the opening degree of the proportional valve 312 can be adjusted by adjusting the position of the valve core in the proportional valve 312, so as to adjust the flow rate of the hydraulic oil output by the proportional valve 312,
in this embodiment, the proportional valve 312 is an electro-hydraulic proportional valve, and the electro-hydraulic proportional valve is signal-connected to the control module 400 and can control the opening degree thereof by the control module 400.
In other embodiments, the proportional valve 312 may be a proportional valve controlled by a mechanical structure or a hydraulic/pneumatic structure, and when the mechanical structure is adopted, the proportional valve 312 needs to be connected with an external power source to control the position of the valve core, so as to control the opening of the proportional valve 312; when a hydraulic structure is adopted, one end of the proportional valve 312 is connected to an external hydraulic oil or pneumatic power source, so that the function of driving the valve core to move is realized, which is not limited only.
Referring to fig. 1 and 2, in the present embodiment, the power apparatus 300 further includes a main pump driving member 3111, the main pump driving member 3111 being power-connected to the hydraulic main pump 311 and configured to drive the hydraulic main pump 311; specifically, in the present embodiment, the main pump driver 3111 may be a main power source in the work machine, such as an engine or the like, or may be a separate drive motor or drive engine, and may supply the hydraulic main pump 311 with a drive force alone, which is not limited only herein.
Specifically, in the present embodiment, the hydraulic oil tank 320 includes a main oil tank 321 and a return oil tank 322, the hydraulic oil pump is connected to the main oil tank 321, and the return ports (B1, B2) of the main control valve 120 are connected to the return oil tank 322.
In the present embodiment, the main oil tank 321, the main control valve 120, the actuator 110 and the return oil tank 322 are sequentially arranged along the oil path of the hydraulic system 10, i.e. the hydraulic oil in the main oil tank 321 is delivered to the actuator 110 via the main control valve 120 and drives the actuator 110 to act, and the hydraulic oil output by the actuator 110 is delivered to the return oil tank 322 via the main control valve 120 to realize the return flow
In other embodiments, the return ports B1 and B2 of the main control valve 120 may be connected to the main tank 321, and the return tank 322 may be omitted, and the main tank 321 may perform the function of receiving the return hydraulic oil.
In one embodiment, the main control valve 120 is a three-position five-way solenoid valve and has two operating positions and one closed position; as shown in fig. 3, when the three-position five-way electromagnetic valve is in the closed position, the driving port C of the three-position five-way valve is disconnected from the input port a and the return port B, and the main control valve 120 can realize the reversing function of the main control valve 120 by switching between two working positions;
it should be noted that, when the main control valve 120 is at one of the working positions, the C1 is connected to the a, the C2 is connected to the B2, the hydraulic oil output from the proportional valve 312 may enter the actuator 110 via the a and the C1, and drive the actuator 110 to act, and the hydraulic oil flowing back from the actuator 110 may be delivered to the return tank 322 via the C2 and the B2;
when the main control valve 120 is at the other working position, C1 is connected to B1, C2 is connected to a, hydraulic oil output from the proportional valve 312 can enter the actuator 110 via a and C2, and drive the actuator 110 to act, and hydraulic oil flowing back from the actuator 110 can be delivered to the return tank 322 via C1 and B1.
In this embodiment, the main control valve 120 is specifically a three-position five-way middle closed position electromagnetic valve, and the valve core of the electromagnetic valve can realize reversing switching of the main control valve 120 by moving forward or backward along the linear direction, so that the main control valve 120 has a compact overall structure and is convenient to install and arrange. In other embodiments, the main control valve 120 may also select a corresponding type of three-position five-way solenoid valve according to actual design requirements, which will not be described herein.
Further, the number of the proportional valves 312 is plural, and the plural proportional valves 312 are arranged in parallel and connected together to the input port a of the main control valve 120.
Referring to fig. 1 and 2, in the present embodiment, the number of the hydraulic main pumps 311 is two, namely, a first hydraulic main pump 311a and a second hydraulic main pump 311b, each of the first hydraulic main pump 311a and the second hydraulic main pump 311b is connected to the main tank 321, and outputs a first oil passage and a second oil passage; in the group of the split components 310, the number of the proportional valves 312 is two, namely a first proportional valve 312a and a second proportional valve 312b, a first oil path is connected to the first proportional valve 312a, a second oil path is connected to the second proportional valve 312b, and an output end of the first proportional valve 312a and an output end of the second proportional valve 312b are connected and connected to an input port a of the main control valve 120; the first oil path is connected to a first proportional valve 312a corresponding to the main control valve 120 in the plurality of actuators 100, and the second oil path is connected to a second proportional valve 312b corresponding to the main control valve 120 in the plurality of actuators 100;
in the operation process of the hydraulic system 10 of the embodiment, the control module 400 may calculate according to the load signal obtained by the sensing assembly 200, for example, when the load signal values of the plurality of actuators 110 in the first group connected to the first oil path are similar or identical, the control module 400 controls the first proportional valves 312a of the plurality of actuators 100 to open, hydraulic oil may drive the plurality of actuators 110 in the first group through the first oil path to operate, and when the load signal values of the plurality of actuators 110 in the other second group are similar or identical, and there is a larger difference between the load signal values of the plurality of actuators 110 in the first group, the control module 400 may control the second proportional valves 312b of the plurality of actuators 100 in the second group to open, hydraulic oil may drive the plurality of actuators 110 in the second group through the second oil path to operate, and the actuators 110 in the first group and the second group may operate independently, and may not affect each other, thereby avoiding the overflow phenomenon caused by the load difference between the plurality of groups of actuators 110.
Specifically, the actuator 110 is a hydraulic cylinder or a swing cylinder.
Referring to fig. 2, in this embodiment, the number of the actuators 110 is four, and three of the actuators are hydraulic cylinders, and another is a rotary cylinder, and in other embodiments, the actuators 110 may be hydraulic cylinders or rotary cylinders, or other types of actuators 110, according to requirements, which is not limited only herein.
Further, the present invention also provides a working machine, which includes a machine body and the hydraulic system 10 according to any one of the above embodiments, where the hydraulic system 10 is disposed on the machine body.
It can be appreciated that in the working machine of the present embodiment, by providing the hydraulic system 10 on the machine body, the hydraulic system 10 can drive the corresponding actuators 110 according to the load signals of the plurality of actuators 100 by providing the sensing assembly 200 and the plurality of actuators 100, so as to avoid overflow loss caused by a large load difference between the actuators 110, and thus, the working effect is good. Specifically, work machines include, but are not limited to, excavators, lifts, road rollers, and the like.
The invention also provides a control method of the hydraulic system, which adopts the hydraulic system 10 in any one of the embodiments, and the control method comprises the following steps:
s100, acquiring load signals of a plurality of execution devices 100;
specifically, each group of executing devices 100 is provided with at least one sensing component 200, and the sensing component 200 can acquire the pressure signal value of the executing mechanism 110 in the input executing device 100 and transmit the signal to the control module 400;
s200, comparing a plurality of load signals;
after the control module 400 receives the load signals, it determines a plurality of load signals, and groups the load signals with the same or similar values, and the execution devices 100 corresponding to each group of the plurality of load signals are driven by one branching component 310.
And S300, according to the comparison result, the power device 300 drives the actuating mechanisms 110 with the similar values of the plurality of load signals to start.
In an embodiment, when the plurality of actuators 110 are the arm cylinder, the boom cylinder, the bucket cylinder, and the swing motor, respectively, and when the combined action (the boom is lowered, the arm is unloaded, and the swing is performed), if the pressure of the boom cylinder is close to the pressure of the arm cylinder, the control module 400 controls the proportional valve 312 corresponding to the first oil path and the arm cylinder, and causes the hydraulic oil of the first oil path to drive the arm cylinder and the boom cylinder to start for operation, and the control module 400 simultaneously controls the proportional valve 312 corresponding to the second oil path and the swing motor to start, and causes the hydraulic oil of the second oil path to drive the swing motor to rotate, thereby achieving the effect of reducing the overflow loss.
By adopting the control method to control the hydraulic system 10, the hydraulic system 10 can realize the shunt conveying of the power device 300 according to the obtained load signal, and each path corresponds to one type of load type, so that the problem of overflow of the hydraulic system 10 caused by different loads is avoided, and the use effect is good.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (9)

1. A hydraulic system, comprising:
the power device is used for providing hydraulic power;
the execution device comprises a main control valve and an execution mechanism, wherein the main control valve is respectively connected with the execution mechanism and the power device, the main control valve is used for controlling the movement direction of the execution mechanism, the main control valve is provided with at least two driving ports, the two driving ports are respectively connected with a plurality of connecting ports of the execution mechanism, the number of the execution devices is multiple, and the execution devices are arranged in parallel;
the sensing assembly is used for sensing the liquid pressure in the hydraulic system and comprises a plurality of pressure sensors, the pressure sensors are connected with the control module in a signal mode, and at least one pressure sensor is arranged between each group of driving ports and each group of connecting ports; and
the control module is connected with the sensing assembly and the power device in a signal way, and is used for judging pressure load signals corresponding to all the actuating mechanisms and grouping load signals with similar or same values so as to control the power device to group and drive all the actuating mechanisms to act.
2. The hydraulic system of claim 1, wherein the power plant includes a bypass assembly and a hydraulic tank, the bypass assembly being connected to the hydraulic tank and the main control valve, respectively, the bypass assembly being signally connected to the control module, the bypass assembly being configured to control a magnitude of flow between the hydraulic tank and the main control valve.
3. The hydraulic system of claim 2, wherein the bypass assembly includes a hydraulic main pump and a proportional valve, the hydraulic main pump being connected to one end of the proportional valve and the hydraulic tank, respectively, the other end of the proportional valve being connected to an input port of the main control valve, the proportional valve being configured to control a magnitude of flow between the main control valve and the hydraulic oil pump.
4. A hydraulic system according to claim 3, wherein the proportional valve is an electro-hydraulic proportional valve.
5. The hydraulic system of claim 2, wherein the hydraulic oil tank includes a main oil tank and a return oil tank, the hydraulic oil pump being connected to the main oil tank, the return port of the main control valve being connected to the return oil tank.
6. The hydraulic system of claim 3 or 4, wherein the number of the proportional valves is plural, and the plural proportional valves are arranged in parallel and connected together to the input port of the main control valve.
7. The hydraulic system of claim 1, wherein the actuator is a hydraulic cylinder or a swing cylinder.
8. A work machine comprising a machine body and a hydraulic system according to any one of claims 1-7, said hydraulic system being arranged on said machine body.
9. A control method of a hydraulic system employing the hydraulic system according to any one of claims 1 to 7, characterized by comprising the steps of:
acquiring load signals of a plurality of execution devices;
comparing a plurality of said load signals;
and according to the comparison result, the power device drives a plurality of execution mechanisms with similar values of the load signals to start.
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