CN112709282A - Control method for giving priority to lifting of movable arm over rotation, electro-hydraulic control system and engineering machinery - Google Patents
Control method for giving priority to lifting of movable arm over rotation, electro-hydraulic control system and engineering machinery Download PDFInfo
- Publication number
- CN112709282A CN112709282A CN201911016731.4A CN201911016731A CN112709282A CN 112709282 A CN112709282 A CN 112709282A CN 201911016731 A CN201911016731 A CN 201911016731A CN 112709282 A CN112709282 A CN 112709282A
- Authority
- CN
- China
- Prior art keywords
- pump
- control valve
- proportional control
- valve
- electro
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000007246 mechanism Effects 0.000 claims abstract description 27
- 230000000694 effects Effects 0.000 abstract description 3
- 238000004134 energy conservation Methods 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 230000009471 action Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000002441 reversible effect Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention relates to the technical field of engineering machinery, and discloses a control method for priority of lifting a movable arm over rotation, an electro-hydraulic control system and engineering machinery. All the pressure oil discharged by the first pump (11) is led to the movable arm; one part of the pressure oil discharged by the second pump (12) is led to the movable arm, and the movable arm is driven to lift in a mode of confluence of the first pump (11) and the second pump (12); another part of the pressure oil discharged from the second pump (12) is led to a slewing mechanism; and the first proportional control valve (13) is used for controlling the first pump (11), and the second proportional control valve (14) is used for controlling the flow of the second pump (12) so as to realize the priority control of boom lifting to rotation. Pressure loss is reduced, oil consumption is reduced, and the effects of energy conservation and environmental protection are achieved.
Description
Technical Field
The invention relates to the technical field of engineering machinery, in particular to a control method for giving priority to lifting of a movable arm over rotation, an electro-hydraulic control system and engineering machinery.
Background
In the excavating and loading working conditions of the excavator, the lifting and the rotation of a movable arm of the excavator are composite actions with the highest use frequency. Because the load of lifting the movable arm is large, and the load of the rotary motor is small, in order to ensure the lifting height of the movable arm, a movable arm lifting priority valve is added at the front part of a rotary valve core in the traditional excavator hydraulic system; the flow distribution between the drive cylinder of the boom and the drive motor of the swing mechanism is achieved by using the boom-raising priority valve. The hydraulic system adopting the structure has large energy loss and low transmission efficiency, and in order to solve the problem, a control method which is beneficial to saving energy and has priority over swing of the movable arm is urgently needed to be researched.
Disclosure of Invention
The invention aims to provide a control method for giving priority to lifting of a movable arm over rotation, which can be used for adjusting flow distribution between the movable arm and a rotation mechanism in real time, realizing control of giving priority to lifting of the movable arm over rotation, further reducing pressure loss and reducing oil consumption.
In order to achieve the above object, the present invention provides a control method for prioritizing boom raising over swing, which employs pressure oil discharged from a pump # one to be entirely led to a boom; one part of the pressure oil discharged by the second pump is led to the movable arm, and the movable arm is driven in a mode of confluence of the first pump and the second pump; another part of the pressure oil discharged from the second pump is led to a slewing mechanism; and controlling the first pump by using a first proportional control valve and controlling the flow of the second pump by using a second proportional control valve to realize the priority control of the lifting of the movable arm to the rotation.
Further, a controller receives and processes signals from the movable arm and the swing mechanism and feeds the signals back to the first proportional control valve and the second proportional control valve, and then the first proportional control valve and the second proportional control valve are used for respectively controlling the flow rates of the first pump and the second pump.
Further, the electro-hydraulic control system comprises a hydraulic system and an electric control system; the hydraulic system comprises a first pump, a second pump, a first proportional control valve and a second proportional control valve, wherein the first proportional control valve is used for controlling the flow of the first pump, and the second proportional control valve is used for controlling the flow of the second pump; the electric control system comprises a controller which can send instructions to the first proportional control valve and the second proportional control valve to control the flow of the first pump and the second pump; the hydraulic system further comprises a first execution unit and a second execution unit; the pressure oil discharged from the first pump is led to the first execution unit, a part of the pressure oil discharged from the second pump is led to the second execution unit, and the other part of the pressure oil discharged from the second pump is led to the first execution unit.
Further, the first pump and the second pump are coaxially driven.
Furthermore, the hydraulic system comprises a first swash plate control structure which is connected with a swash plate of the first pump and used for changing the flow of the first pump, and a second swash plate control structure which is connected with a swash plate of the second pump and used for changing the flow of the second pump.
Further, the hydraulic system includes a pilot pump for supplying pilot pressure oil; a working oil port of the first proportional control valve is communicated with the first swash plate control structure; the working oil of the second proportional control valve is communicated with the second swash plate control structure; oil inlets of the first proportional control valve and the second proportional control valve are respectively communicated with the pilot pump.
Further, the output end of the controller is respectively connected with the input end of the first proportional control valve and the input end of the second proportional control valve.
Further, the electrical control system comprises a pilot signal sensor for acquiring real-time working condition parameters of the first execution unit and the second execution unit and providing signals to the controller.
Further, the electric system also comprises a first output pressure sensor arranged at the oil outlet of the first pump and a second output pressure sensor arranged at the oil outlet of the second pump; the output end of the first output pressure sensor and the output end of the second output pressure sensor are connected with the input end of the controller.
Further, the hydraulic system comprises a first reversing valve arranged between the first pump and the first execution unit, and a second reversing valve arranged between the second pump and the first execution unit; and the pressure oil flowing out of the first pump and the second pump flows into the same oil inlet of the first execution unit after passing through the second reversing valve and the first reversing valve and then is converged.
Further, the hydraulic system further comprises a third reversing valve; the oil inlet of the third reversing valve is connected to an oil path between the oil outlet of the second pump and the oil inlet of the second reversing valve; and a working oil port of the third reversing valve is communicated with the second execution unit.
Further, the first pump can directly return oil when the first reversing valve is in the original position; when the second reversing valve and the third reversing valve are simultaneously in original positions, the second pump can directly return oil.
A working machine comprising an electro-hydraulic control system as described above, wherein boom lifting of the working machine is prioritized over swing.
According to the technical scheme, all the pressure oil discharged by the first pump is led to the movable arm; one part of pressure oil discharged by the second pump is led to the movable arm, and the other part of pressure oil is led to the slewing mechanism; the first proportional control valve (13) is used for controlling the first pump (11) and the second proportional control valve (14) to control the flow of the second pump (12) so as to realize the priority control of the boom lifting to the rotation. Pressure loss is reduced, oil consumption is reduced, and the effects of energy conservation and environmental protection are achieved.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of an electro-hydraulic control system according to an embodiment of the present application.
Description of the reference numerals
1. A hydraulic system; 11. a first pump; 12. a second pump; 111. a swash plate control structure; 121. a second swash plate control structure; 13. a first proportional control valve; 14. a second proportional control valve; 15. a first direction changing valve; 16. a second directional control valve; 17. a third directional control valve; 18. a first single-phase valve; 19. a second single-phase valve; 2. and a controller.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. In the present invention, it is to be understood that the terms "away", "toward", "upper", "lower", "front", "rear", "left", "right", and the like indicate an orientation or positional relationship corresponding to an orientation or positional relationship in actual use; "inner and outer" refer to the inner and outer relative to the profile of the components themselves; this is done solely for the purpose of facilitating the description of the invention and simplifying the description without indicating that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation and therefore should not be construed as limiting the invention.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The invention provides a control method for giving priority to lifting of a movable arm over rotation, which adopts the technical scheme that pressure oil discharged by a first pump 11 is completely led to the movable arm; a part of the pressure oil discharged from the second pump 12 is led to the boom, and the boom is driven by a way of merging the first pump 11 and the second pump 12; another part of the pressure oil discharged from the second pump 12 is led to a slewing gear; the first proportional control valve 13 is used for controlling the first pump 11, and the second proportional control valve 14 is used for controlling the flow of the second pump 12, so that the priority control of boom lifting to rotation is realized. The pressure oil discharged by the first pump 11 is led to the movable arm; a part of the pressure oil discharged by the second pump 12 is led to the movable arm, and the other part of the pressure oil is led to the slewing mechanism; the movable arm is driven to lift by adopting a mode of merging the pressure oil discharged from the first pump 11 and a part of the pressure oil discharged from the second pump 12, the flow of the first pump 11 and the flow of the second pump 12 are respectively controlled by utilizing an electric proportional valve to adjust the flow distribution between the movable arm and the slewing mechanism in real time, the control that the lifting of the movable arm is prior to the slewing is realized, the pressure loss is further reduced, and the oil consumption is reduced.
Preferably, the controller 2 receives and processes signals from the boom and the swing mechanism, and feeds the signals back to the first proportional control valve 13 and the second proportional control valve 14, and then the first proportional control valve 13 and the second proportional control valve 14 respectively control the flow rates of the first pump 11 and the second pump 12. The controller 2 receives and processes the signals, and then sends instructions to the first proportional control valve 13 and the second proportional control valve 14 according to the processing results to control the flow of the first pump 11 and the second pump 12, so as to control the movable arm and the swing mechanism; when the boom and the swing mechanism operate according to the pressure oil flowing from the first pump 11 and the second pump 12, the relevant operation signal is received by the controller 2 and processed … …; and the flow distribution between the movable arm and the swing mechanism is adjusted in real time in such a way.
A second aspect of the present invention provides an electro-hydraulic control system, as shown in fig. 1: the electro-hydraulic control system comprises a hydraulic system 1 and an electric control system; the hydraulic system 1 comprises a first pump 11 and a second pump 12, and further comprises a first proportional control valve 13 for controlling the flow of the first pump 11 and a second proportional control valve 14 for controlling the flow of the second pump 12; the electrical control system comprises a controller 2 capable of sending commands to the first proportional control valve 13 and the second proportional control valve 14 for controlling the flow of the first pump 11 and the second pump 12; the hydraulic system 1 further comprises a first execution unit and a second execution unit; the pressure oil discharged from the first pump 11 is led to the first actuator, a part of the pressure oil discharged from the second pump 12 is led to the second actuator, and the other part of the pressure oil discharged from the second pump 12 is led to the first actuator. All pressure oil discharged by the first pump 11 is led to the first execution unit through the electro-hydraulic control system; a part of the pressure oil discharged by the second pump 12 is led to the first execution unit, and the other part of the pressure oil is led to the second execution unit; the first execution unit is driven to act by adopting a mode of converging the pressure oil discharged from the first pump 11 and a part of the pressure oil discharged from the second pump 12, the flow distribution between the first execution unit and the second execution unit is adjusted in real time by respectively controlling the flow of the first pump 11 and the flow of the second pump 12 through the electric proportional valve, the action of the first execution unit is controlled to be prior to the action of the second execution unit, the pressure loss is reduced, the oil consumption is reduced, and the effects of energy conservation and environmental protection are achieved.
Preferably, the first pump 11 and the second pump 12 are driven coaxially. In this way, the synchronism of the first pump 11 and the second pump 12 can be ensured.
Preferably, the hydraulic system 1 includes a first swash plate control structure 111 connected to a swash plate of the first pump 11 for changing a flow rate of the first pump 11, and a second swash plate control structure 121 connected to a swash plate of the second pump 12 for changing a flow rate of the second pump 12. The inclination angles of the swash plate of the first pump 11 and the swash plate of the second pump 12 can be changed in decibels by the respective actions of the first swash plate control structure 111 and the second swash plate control structure 121, so that the flow rates of the first pump 11 and the second pump 12 can be changed
Preferably, the hydraulic system 1 comprises a pilot pump for providing pilot pressure oil; the working oil port of the first proportional control valve 13 is communicated with the first swash plate control structure 111; the working oil of the second proportional control valve 14 is communicated with the second swash plate control structure 121; oil inlets of the first proportional control valve 13 and the second proportional control valve 14 are respectively communicated with the pilot pump. The pilot pump can supply pilot pressure oil to the first proportional control valve 13 and the second proportional control valve 14, and when the first proportional control valve 13 and the second proportional control valve 14 receive a command from the controller 2, spools of the first proportional control valve 13 and the second proportional control valve 14 are moved by the pilot pressure oil, so that the pressure of the secondary pressure oil discharged from the oil outlets of the first proportional control valve 13 and the second proportional control valve 14 is controlled.
Preferably, the output of the controller 2 is connected to the input of the first proportional control valve 13 and the input of the second proportional control valve 14, respectively. Thus, the controller 2 can transmit control signals to the first proportional control valve 13 and the second proportional control valve 14 according to the received and processed signals, and further control the flow rates of the first pump 11 and the second pump 12.
Preferably, the electrical control system comprises a pilot signal sensor for acquiring real-time operating condition parameters of the first and second execution units and providing a signal to the controller 2. The pilot signal sensors may be disposed on the first direction valve 15, the second direction valve 16, and the third direction valve 17, for example, and have the advantages of high sensitivity, high reliability, and good performance, and the changes of the real-time operating conditions of the first execution unit and the second execution unit can be timely distinguished by the pilot signal sensors, and can be timely transmitted to the controller 2.
Preferably, the electrical system further comprises a first output pressure sensor arranged at the oil outlet of the first pump 11 and a second output pressure sensor arranged at the oil outlet of the second pump 12; the output end of the first output pressure sensor and the output end of the second output pressure sensor are both connected with the input end of the controller 2. The outlet pressures of the first pump 11 and the second pump 12 can be collected through the first output pressure sensor and the second output pressure sensor, the parameters are transmitted to the controller 2, then the flow rates of the first pump 11 and the second pump 12 are respectively calculated through the controller 2, the pressure of the secondary pressure oil output by the first proportional control valve 13 and the second proportional control valve 14 is controlled according to the calculation results, and then the flow rates of the first pump 11 and the second pump 12 are controlled.
Preferably, the hydraulic system 1 comprises a first directional control valve 15 arranged between the first pump 11 and the first actuator, and a second directional control valve 16 arranged between the second pump 12 and the first actuator; the pressure oil flowing out of the first pump 11 and the second pump 12 passes through the second reversing valve 16 and the first reversing valve 15 and then merges into the same oil inlet of the first execution unit. In this way, the control of the first actuator is performed so that the pressure oil discharged from the first pump 11 and the second pump 12 merge, and conditions are provided for the operation of the first actuator to be prioritized over the operation of the second actuator.
Preferably, the hydraulic system 1 further comprises a third directional control valve 17; the oil inlet of the third reversing valve 17 is connected to an oil path between the oil outlet of the second pump 12 and the oil inlet of the second reversing valve 16; the working oil port of the third reversing valve 17 leads to the second execution unit. This arrangement ensures that a portion of the pressurized oil discharged from the second pump 12 flows to the second direction valve 16 and a portion flows to the third direction valve 17.
Preferably, the first pump 11 can return oil directly when the first reversing valve 15 is in the original position; the second pump 12 can return oil directly when the second reversing valve 16 and the third reversing valve 17 are in the original positions at the same time. Because the first actuating mechanism and the second actuating mechanism do not work all the time after the first pump 11 and the second pump 12 are started, the first actuating mechanism and the second actuating mechanism are arranged, the first pump 11 and the second pump 12 are prevented from being started and stopped repeatedly, and the service lives of the first pump 11 and the second pump 12 are prolonged.
Further preferentially, the hydraulic system 1 further comprises a first single valve 18 arranged between the oil inlet of the first reversing valve 15 and the oil outlet of the first pump 11 for preventing the pressure oil to the movable arm from flowing backwards, and the oil inlet of the first single valve 18 faces the first pump 11.
Still further preferably, the hydraulic system 1 further comprises a second one-way valve 19 disposed between the third directional valve 17 and the pump No. two 12 for preventing the reverse flow of the pressure oil to the swing mechanism; the oil inlet of the second single valve 19 faces the second pump 12.
Preferably, in the electro-hydraulic control system, the first pump 11, the first proportional control valve 13 and the first swash plate control structure 111 are provided as an integral structure; the second pump 12 and the second swash plate control structure 121 and the second proportional control valve 14 are provided as an integral structure.
A third aspect of the invention provides a working machine comprising an electro-hydraulic control system as described above, the working machine having a boom that is lifted in preference to slewing.
One specific embodiment of the construction machine is an excavator, the excavator includes a boom and a swing mechanism, and when the boom and the swing mechanism simultaneously operate during a loading operation of the excavator, as shown in fig. 1: the operation of the boom and the swing mechanism is controlled by the first pump 11 and the second pump 12, respectively. The flow output by the first pump 11 reaches a driving oil cylinder of a movable arm through a first reversing valve 15; a part of the flow output by the second pump 12 flows to a driving oil cylinder of the swing mechanism through a third reversing valve 17 to control the swing mechanism to act; the other part of the output flow of the second pump 12 flows to the boom driving cylinder through the second direction changing valve 16 to merge with the pressure oil flowing from the first direction changing valve 15 to the boom driving cylinder and then drive the boom to lift.
In the present embodiment, the controller 2 is a vehicle controller capable of monitoring the vehicle operation condition of the excavator, the controller 2 is capable of monitoring the load, the rotation speed, and the like of the boom and the swing mechanism, for example, and outputting a control signal to the first proportional control valve 13 and the second proportional control valve 14 through calculation according to the monitored signal, and the first proportional control valve 13 and the second proportional control valve 14 output secondary pressure oil according to the received signal from the controller 2 for controlling the operation of the first swash plate control structure 111 and the second swash plate control structure 121 respectively, so as to control the flow rates of the first pump 11 and the second pump 12. The first swash plate control structure 111 is a swash plate control piston, the second swash plate control structure 121 is a swash plate control piston, and the swash plate angles of the first pump 11 and the second pump 12 are controlled through the swash plate control piston and the second swash plate control piston so as to control the output flow of the first pump 11 and the second pump 12, and then lifting of the movable arm is prior to rotation.
In the present embodiment, the hydraulic system 1 further includes a first single valve 18 for preventing the reverse flow of the pressure oil to the boom, the first single valve 18 is disposed between an oil inlet of the first direction changing valve 15 and an oil outlet of the first pump 11, and an oil inlet of the first single valve 18 faces the first pump 11.
The hydraulic system 1 further comprises a second one-way valve 19 arranged between the third reversing valve 17 and the pump No. two 12 for preventing the reverse flow of the pressure oil to the swing mechanism; the oil inlet of the second single valve 19 faces the second pump 12.
In the present embodiment, the revolving mechanism is driven by a revolving motor, and an oil inlet of the revolving motor is communicated with an oil outlet of the third reversing valve 17.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention. For example, the hydraulic system may be changed to a pneumatic system.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (13)
1. A control method for prioritizing lifting of a movable arm over rotation is characterized in that all pressure oil discharged by a first pump (11) is led to the movable arm; a part of the pressure oil discharged by the second pump (12) is led to the movable arm, and the movable arm is driven by adopting a mode of confluence of the first pump (11) and the second pump (12); another part of the pressure oil discharged from the second pump (12) is led to a slewing mechanism; and the first proportional control valve (13) is used for controlling the first pump (11), and the second proportional control valve (14) is used for controlling the flow of the second pump (12) so as to realize the priority control of boom lifting to rotation.
2. The method for controlling boom lifting over swing according to claim 1, characterized in that the flow rates of the first pump (11) and the second pump (12) are controlled by the first proportional control valve (13) and the second proportional control valve (14) respectively by receiving signals from the boom and the swing mechanism by a controller (2) and processing the signals and feeding the signals back to the first proportional control valve (13) and the second proportional control valve (14).
3. An electro-hydraulic control system, characterized in that it comprises a hydraulic system (1) and an electrical control system; the hydraulic system (1) comprises a first pump (11) and a second pump (12) and further comprises a first proportional control valve (13) used for controlling the flow of the first pump (11) and a second proportional control valve (14) used for controlling the flow of the second pump (12); the electrical control system comprises a controller (2) capable of sending commands to the first proportional control valve (13) and the second proportional control valve (14) for controlling the flow rates of the first pump (11) and the second pump (12); the hydraulic system (1) further comprises a first execution unit and a second execution unit; the pressure oil discharged from the first pump (11) is led to the first execution unit, a part of the pressure oil discharged from the second pump (12) is led to the second execution unit, and the other part of the pressure oil discharged from the second pump (12) is led to the first execution unit.
4. Electro-hydraulic control system according to claim 3, characterized in that the first pump (11) and the second pump (12) are driven coaxially.
5. The electro-hydraulic control system of claim 4, characterized in that the hydraulic system (1) comprises a first swash plate control structure (111) connected with a swash plate of the first pump (11) for changing the flow rate of the first pump (11), and a second swash plate control structure (121) connected with a swash plate of the second pump (12) for changing the flow rate of the second pump (12).
6. The electro-hydraulic control system of claim 5, characterized in that the hydraulic system (1) comprises a pilot pump for providing pilot pressure oil; the working oil port of the first proportional control valve (13) is communicated with the first swash plate control structure (111); the working oil of the second proportional control valve (14) is communicated with the second swash plate control structure (121); oil inlets of the first proportional control valve (13) and the second proportional control valve (14) are respectively communicated with the pilot pump.
7. Electro-hydraulic control system according to claim 3, characterized in that the output of the controller (2) is connected to the input of the first proportional control valve (13) and the input of the second proportional control valve (14), respectively.
8. The electro-hydraulic control system of claim 7, wherein the electrical control system comprises a pilot signal sensor for acquiring real-time operating condition parameters of the first and second execution units and providing a signal to the controller (2).
9. The electro-hydraulic control system of claim 8, wherein the electrical system further comprises a first output pressure sensor disposed at an oil outlet of the first pump (11) and a second output pressure sensor disposed at an oil outlet of the second pump (12); the output end of the first output pressure sensor and the output end of the second output pressure sensor are both connected with the input end of the controller (2).
10. The electro-hydraulic control system of claim 9, wherein the hydraulic system (1) includes a first directional control valve (15) disposed between the first pump (11) and the first implement unit, a second directional control valve (16) disposed between the second pump (12) and the first implement unit; the pressure oil flowing out of the first pump (11) and the second pump (12) passes through the second reversing valve (16) and the first reversing valve (15) and then merges into the same oil inlet of the first execution unit.
11. Electro-hydraulic control system according to claim 10, characterized in that the hydraulic system (1) further comprises a third directional control valve (17); the oil inlet of the third reversing valve (17) is connected to an oil path between the oil outlet of the second pump (12) and the oil inlet of the second reversing valve (16); and a working oil port of the third reversing valve (17) is communicated with the second execution unit.
12. The electro-hydraulic control system of claim 11, wherein the first pump (11) is capable of returning oil directly when the first reversing valve (15) is in a home position; the second pump (12) can directly return oil when the second reversing valve (16) and the third reversing valve (17) are simultaneously in the original position.
13. A working machine, characterized in that the working machine comprises an electro-hydraulic control system according to any one of claims 3-12, and that boom lifting of the working machine is prioritized over swing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911016731.4A CN112709282A (en) | 2019-10-24 | 2019-10-24 | Control method for giving priority to lifting of movable arm over rotation, electro-hydraulic control system and engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911016731.4A CN112709282A (en) | 2019-10-24 | 2019-10-24 | Control method for giving priority to lifting of movable arm over rotation, electro-hydraulic control system and engineering machinery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112709282A true CN112709282A (en) | 2021-04-27 |
Family
ID=75540552
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911016731.4A Pending CN112709282A (en) | 2019-10-24 | 2019-10-24 | Control method for giving priority to lifting of movable arm over rotation, electro-hydraulic control system and engineering machinery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112709282A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113293819A (en) * | 2021-06-01 | 2021-08-24 | 山东临工工程机械有限公司 | Excavator working tool confluence control system and excavator |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1786486A (en) * | 2004-12-07 | 2006-06-14 | 沃尔沃建造设备控股（瑞典）有限公司 | Hydraulic control circuit and method thereof |
| JP4338758B2 (en) * | 2005-05-18 | 2009-10-07 | 株式会社小松製作所 | Hydraulic control equipment for construction machinery |
| CN102400476A (en) * | 2011-10-28 | 2012-04-04 | 山河智能装备股份有限公司 | Hydraulic circuit controlling preferred movement of moveable arm to lift or rotate |
| CN203113416U (en) * | 2013-03-25 | 2013-08-07 | 黄颖 | High-precision hydraulic control system |
| JP2013181287A (en) * | 2012-02-29 | 2013-09-12 | Sumitomo (Shi) Construction Machinery Co Ltd | Construction machine |
-
2019
- 2019-10-24 CN CN201911016731.4A patent/CN112709282A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1786486A (en) * | 2004-12-07 | 2006-06-14 | 沃尔沃建造设备控股（瑞典）有限公司 | Hydraulic control circuit and method thereof |
| JP4338758B2 (en) * | 2005-05-18 | 2009-10-07 | 株式会社小松製作所 | Hydraulic control equipment for construction machinery |
| CN102400476A (en) * | 2011-10-28 | 2012-04-04 | 山河智能装备股份有限公司 | Hydraulic circuit controlling preferred movement of moveable arm to lift or rotate |
| JP2013181287A (en) * | 2012-02-29 | 2013-09-12 | Sumitomo (Shi) Construction Machinery Co Ltd | Construction machine |
| CN203113416U (en) * | 2013-03-25 | 2013-08-07 | 黄颖 | High-precision hydraulic control system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113293819A (en) * | 2021-06-01 | 2021-08-24 | 山东临工工程机械有限公司 | Excavator working tool confluence control system and excavator |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9187297B2 (en) | Hydraulic driving apparatus for working machine | |
| JP5351471B2 (en) | Drive device for work machine | |
| US9650232B2 (en) | Hydraulic drive apparatus for work machine | |
| US7895833B2 (en) | Hydraulic drive apparatus | |
| CN109715889B (en) | Control system for construction machine and control method for construction machine | |
| EP1795657B1 (en) | Hydraulic circuit for heavy construction equipment | |
| CN104870831A (en) | Hydraulic control device and construction machine with same | |
| CN109790857B (en) | Hydraulic drive system for construction machine | |
| CN201526546U (en) | Hydraulic control system of underground anti-explosion hoister adopting multi-pump combination technique | |
| JP2014205977A (en) | Drive unit of working machine | |
| CN115324954A (en) | Electric load sensitivity-electro-hydrostatic composite driving control method for engineering machinery operation system | |
| CN109914517B (en) | Intelligent rotation energy-saving control system of excavator | |
| CN112709282A (en) | Control method for giving priority to lifting of movable arm over rotation, electro-hydraulic control system and engineering machinery | |
| CN103031957B (en) | Control system and method for concrete machine | |
| WO2016092809A1 (en) | Hydraulic drive system for construction machinery | |
| JP2013541683A (en) | Hydraulic system for construction machinery | |
| CN116657680A (en) | Control device and control method of electric-driven bulldozer and bulldozer | |
| CN109538557B (en) | Control system and method for telescopic oil cylinder of crane and crane | |
| CN110526140B (en) | Tire crane auxiliary system and control method | |
| CN108909832B (en) | Steering hydraulic system and loader | |
| JP2002265187A (en) | Revolution control device | |
| KR100998606B1 (en) | control system of hydraulic pump flow of construction apparatus | |
| EP2446152B1 (en) | Hydraulic main valve and auxiliary valve | |
| CN221462621U (en) | Hydraulic system and excavator | |
| CN215672927U (en) | Rotary hydraulic system and working machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210427 |